Spiral classifier - The classifier designs differ mainly in the mode of removing the underflow and the overflow slurries. Immersed spiral or rakes are generally used for underflow slurries and an open launder carries the overflow. Figure 13.1 is a sketch of a spiral classifier where the spiral conveyor is installed within the bowl. The spiral operates along the ...

 
The spiral classifier is based on the principle that the solid particles are different in size and specific gravity, so the settling speed in the liquid is different. Fine ore particles float in the water and overflow, and coarse ore particles sink to the bottom of the tank.. Isla moon onlyfans leaks

Spiral classifier is used to treat alluvial placer, especially for those with high dissociation degree and flat shape of mineral monomer. Spiral classifier and ball mill generally cooperate, mostly used for mineral processing. The classifier has the characteristics of simple structure, reliable operation, convenient operation, high efficiency ... Spiral classifier. Spiral classifier is one of the classifying equipment in mineral processing. It is suitable for classifying materials in the mineral processing plant as well as the desliming and dehydrating in the mineral washing operating process and widely applied to separate the particles into a number of products graded according to size in the complete closed loop together with ball ...Mokup of classifier, 2 principles, 1600 mm screw diameter. Still in use in several silica sand plant: wash drain and dedusting. spiral classifier 1600 | 3D CAD Model Library | GrabCAD Spiral classifiers. A typical spiral classifier is shown in Fig. 1. The geometry of a spiral is characterized by the length or number of turns, the diameter, the pitch and the shape of the trough ( Burt, 1984). The spiral feed is a mixture of water and ground particles that is gravity fed at the top of the spiral.Market Overview: The spiral classifier market is expected to grow at a CAGR of 7.5% during the forecast period from 2022 to 2030. This growth can be attributed to the increasing demand for efficient and accurate processing of materials.on a slope, with interrupted rake or spiral blades to move the settled solids to a central discharge cone. Tank diameters vary from 4 to 250 ft. Tank depths at center are 2 to 3 ft for small units and up to 25 ft for larger units. Hydraulic classifiers of the sizer and super-sorter types, Figs. 7 and 8, are narrow, deep, rectangularJun 18, 2023 · Spiral Classifier Market Emerging Trends and Forecast 2023-2030 Published: June 18, 2023 at 8:56 p.m. ET Spiral classifiers work great and generally aren't a maintenance problem. The main problem is that most mills have outgrown them for direct use in closed circuits. The best bet would be to pump the mill discharge to the classifier and flow the sands by gravity back into the mill if direct feed can't be arranged.Description FC and FG Series Spiral Classifier is mainly used in pre-classification and examination classification of grinding circuit in concentration plant and aggregate plant as well as desliming and dehydration in the process of sand washing. It can be classified into single spiral and double spiral according to the spiral quantity; and high weir type and sinking type according to the ...The ball mill is for grinding 0-20mm to small powder. It works together with the spiral classifier, so the overflow slurry from the classifier is about 80% 200mesh powder. The oversize particle from the classifier will go back to the ball mill grinding again, to form a closed-loop.The spiral classifier is widely applied for the following fields: combine with ball grinder into closed circulation for ore-sand separation in the ore separation plant; classify ore sand and fine sludge in gravity ore separation plant; classify the grain of ore pulp at the metal ore separation process; and remove sludge/water at the ore separation process. Now, the common classifiers in mineral processing plant are mainly mechanical classifier and hydrocyclone. Among them,mechanical classifier can be divided into spiral classifier, rake classifier,tank classifier and other types. With the development of classification operation, rake classifier is already replaced by spiral classifier, tank ...Spiral Dewaterer model - SD Metso spiral dewaterer model SD is a robust evolution of the spiral classifier for reliable operations in mill scale handling. The spiral dewaterer with special designed spiral and enlarged pool area is able to handle large flows of effluents, offering a well dewatered mill scale product and a clear overflow ...Jul 31, 2023 · The Submerged Spiral Classifier Market is undergoing a remarkable transformation, fueled by cutting-edge technologies and a deep commitment to meeting user needs. Companies within the industry are ... Sep 7, 2023 · Chapter 1: High Weir Spiral Classifier Market Product Definition, Product Types, Volume, and Revenue Analysis of Each Type in North America, Europe, Asia-Pacific, Latin America, Middle East, and ... Spiral classifier is used for material classification with spirals used to stir and convey materials according to the difference in material settling velocities. It is a kind of gravitational and hydraulic classifiers. The specification of spiral classifiers is represented by the number and diameter of spirals.A study on physical beneficiation of platinum group metals (PGMs) flotation tailings was carried out by means of spiral classifiers and a gravity separator (Knelson Concentrator – KC-CVD 6 unit).Aug 6, 2015 · The rake classifier such as the Dorr classifier consists of a rectangular tank with a sloping/inclined bottom. The tank is provided with movable rakes (reciprocating rakes). The feed in the form of a suspension (slurry) is introduced continuously near the middle of the tank. The lower end of the tank has a weir overflow (discharge weir) from ... Spiral classifiers. A typical spiral classifier is shown in Fig. 1. The geometry of a spiral is characterized by the length or number of turns, the diameter, the pitch and the shape of the trough (Burt, 1984). The spiral feed is a mixture of water and ground particles that is gravity fed at the top of the spiral.If you don't have the muscle power or time, let a spiral panning machine help you separate the gold from your concentrates and black sand much more quickly and easily. FREE SHIPPING on orders of $350 or more! To learn more about the manufacturer and use of the Desert Fox, Mountain Goat, and Pro Camel, scroll to the bottom of this page. XBM Mining is a leading global supplier of equipment and tools, service and technical solutions for the mining industry,especially specialized in ore benefic...Spiral classifiers work great and generally aren't a maintenance problem. The main problem is that most mills have outgrown them for direct use in closed circuits. The best bet would be to pump the mill discharge to the classifier and flow the sands by gravity back into the mill if direct feed can't be arranged.EIMCO-K.C.P. Offers Bridge mounted (B) type, Column Mounted (C) Type and Traction driven (T) type Classifiers mechanism for various applications. These operate on the common principle of moving settled solids to the center of principle of moving settled solids to the centre of the tank for removal, and differ principally in the method used to ...Triveni Spiral Classifiers utilize an increased for maximum torque and quiet, trouble free. lead or helix angle to form the continuous high pitch performance. Spiral for greater raking capacity. The upper main bearing is over sized for normal. Classifier service. Also this bearing and gear pivot is on.The rake classifier such as the Dorr classifier consists of a rectangular tank with a sloping/inclined bottom. The tank is provided with movable rakes (reciprocating rakes). The feed in the form of a suspension (slurry) is introduced continuously near the middle of the tank. The lower end of the tank has a weir overflow (discharge weir) from ...Spiral Classifier Market report also includes a pricing analysis for each type, manufacturer, region, and global price from 2018 to 2030. This information will help stakeholders make informed ...The spiral classifier is widely applied for the following fields: combine with ball grinder into closed circulation for ore-sand separation in the ore separation plant; classify ore sand and fine sludge in gravity ore separation plant; classify the grain of ore pulp at the metal ore separation process; and remove sludge/water at the ore separation process. The spiral classifier is based on the principle that the solid particles are different in size and specific gravity, so the settling speed in the liquid is different. Fine ore particles float in the water and overflow, and coarse ore particles sink to the bottom of the tank. Spiral classifiers work great and generally aren't a maintenance problem. The main problem is that most mills have outgrown them for direct use in closed circuits. The best bet would be to pump the mill discharge to the classifier and flow the sands by gravity back into the mill if direct feed can't be arranged.Misconception 4: Fine Material Screws are recommended for cutting at a coarse sand size. Fine Material Screw Washers generally are not recommended for removing fine solids larger than 150 micron or 100 mesh. When a separation ranging from 150 to 800 micron (or 100 to 20 mesh) is required, other types of classifiers, like Hydrosizers™ (or ...The rotation speed of the commonly used spiral classifier is. To obtain coarse overflow, the speed of the spiral with a diameter of 2 m should not exceed 6 r/min, and with a diameter of 1 m or more should be controlled at 2-8 r/min. For example, for a spiral with a diameter of 0.3 m, in order to obtain a coarse overflow, the spiral speed can be ...The classifier is mainly composed of transmission device, spiral body, trough, lifting mechanism, lower support (bearing) and discharge valve. Spiral Classifier Advantages: 1、Simple structure, easy to maintain. 2、Easy operation and stable performance. 3、Gravity connection with Ball mills; slurry pump conveying is not necessary.A study on physical beneficiation of platinum group metals (PGMs) flotation tailings was carried out by means of spiral classifiers and a gravity separator (Knelson Concentrator – KC-CVD 6 unit).The preferential classification benefit of cyclones is further illustrated in Table 2 which compares the metallurgical results of cyclones versus spiral classifiers in a copper grinding circuit. The cyclone produced an overflow product containing more copper in the finer size ranges where it will be subject to higher recovery in flotation. Triveni Spiral Classifiers utilize an increased for maximum torque and quiet, trouble free. lead or helix angle to form the continuous high pitch performance. Spiral for greater raking capacity. The upper main bearing is over sized for normal. Classifier service. Also this bearing and gear pivot is on. Nesans Spiral Classifier consists of an open trough with a chute provided for the input feed material. Before being fed into the spiral classifier, the dust from the screen is mixed with water and it is carried to the input chute through a slurry pump. The inlet flow is evenly distributed across the surface area of the spirals. To understand how these two classifiers make use of this settling action, a description of them is required. First, to have the classification happen, the slurry must be able to flow. This means the classifiers must be inclined. The working portion of these two classifiers are the RAKES or SPIRAL/screw which are placed into the flow of ore. To ...Spiral Dewaterer model - SD Metso spiral dewaterer model SD is a robust evolution of the spiral classifier for reliable operations in mill scale handling. The spiral dewaterer with special designed spiral and enlarged pool area is able to handle large flows of effluents, offering a well dewatered mill scale product and a clear overflow ... Our report on the Spiral Classifier Market provides a comprehensive overview of the current market trends and dynamics. It offers an in-depth analysis of the leading players in the market, along ...EIMCO-K.C.P. Spiral Classifiers are mechanically the devices are powerfully built, and functionally they are versatile and flexible. Today’s worldwide acceptance of EIMCO-K.C.P. Classifiers for washing and dewatering pulps, and in closed-circuit grinding is the result of many years of experience in solving wet classification problems.Nov 28, 2022 · High Weir Spiral Classifier, one of the segments analyzed in the report, is projected to record 2.3% CAGR and reach US$827.7 Million by the end of the analysis period. Taking into account the ... Triveni Spiral Classifiers utilize an increased for maximum torque and quiet, trouble free. lead or helix angle to form the continuous high pitch performance. Spiral for greater raking capacity. The upper main bearing is over sized for normal. Classifier service. Also this bearing and gear pivot is on.Sep 29, 2017 · It is evident that no linear classifier will be able to do a good job classifying spiral data where the boundary between two classes is a curve. A simple two layer network with RELU activation on the hidden layer automatically learns the decision boundaries and achieves a 99% classification accuracy on such a data set. Sep 7, 2023 · Chapter 1: High Weir Spiral Classifier Market Product Definition, Product Types, Volume, and Revenue Analysis of Each Type in North America, Europe, Asia-Pacific, Latin America, Middle East, and ... Apr 28, 2007 · spiral classifier consists of a sloping elongated . round-bottom tank and a sand-raking spiral [46]. The raw materials are fed to the central . section of the pool and flow to the weir while . Product Features. 1.This classifier adopts sealing immersed bearing. 2. Independent hoisting equipment with strong reshipment power. 3. Wearable liner of bolt installed to prolong the service life. 4. Cell body in long and narrow shape can reach a good mixing effect and prolong the suspension time of materials.The Submerged Spiral Classifier Market is undergoing a remarkable transformation, fueled by cutting-edge technologies and a deep commitment to meeting user needs. Companies within the industry are ...Published Jun 28, 2023. + Follow. The market research conducted by Global High Weir Spiral Classifier Market offers an in-depth analysis of the global market, with a focus on future projections ...Submerged Spiral Classifier Market Enigma on a Global Stage | Phenomenal Growth Outlook to 2030 Sep 8, 2023 ...Shaker Tables. MBMM produces high-performance shaker tables for gravity separation based on different material densities. They are designed for maximum performance by combining the best of many proven designs, refined after many hundreds of hours of R&D. The most notable feature is from an old 1909 Deister patent: a ramp and plateau system ...Lab Spiral Classifier. This Lab Spiral classifiers suitable for dewatering, medium drainage and desliming and wet and dry classifying for ore, Non-metallic materials, etc. Spiral classifier is a type of classifying equipment which realizes mechanical classification under the principle that materials settle in the liquid at different speeds due ... 13.5.3.4 Spiral Concentrator. The spiral concentrator is a modern high-capacity and low-cost device. It is developed for concentration of low-grade ores and industrial minerals in slurry form. It works on a combination of solid particle density and its hydrodynamic dragging properties. The concept of spiral classifiers cathodic protection presented in this paper may become an alternative to the anti-corrosion protection methods of machinery and equipment used now at the KGHM ...Nov 28, 2022 · High Weir Spiral Classifier, one of the segments analyzed in the report, is projected to record 2.3% CAGR and reach US$827.7 Million by the end of the analysis period. Taking into account the ... Aug 6, 2015 · To understand how these two classifiers make use of this settling action, a description of them is required. First, to have the classification happen, the slurry must be able to flow. This means the classifiers must be inclined. The working portion of these two classifiers are the RAKES or SPIRAL/screw which are placed into the flow of ore. To ... Lab Spiral Classifier. This Lab Spiral classifiers suitable for dewatering, medium drainage and desliming and wet and dry classifying for ore, Non-metallic materials, etc. Spiral classifier is a type of classifying equipment which realizes mechanical classification under the principle that materials settle in the liquid at different speeds due ... Spiral classifier is a mechanical classification machine based on the principle that the specific gravity of solid particles is different in the speed of precipitation in liquid. During the beneficiation process, the ore needs to be ground to a certain fineness so that the fine-grained useful minerals and gangue can be fully dissociated and ... EIMCO-K.C.P. Spiral Classifiers are mechanically the devices are powerfully built, and functionally they are versatile and flexible. Today’s worldwide acceptance of EIMCO-K.C.P. Classifiers for washing and dewatering pulps, and in closed-circuit grinding is the result of many years of experience in solving wet classification problems. Lab Spiral Classifier. This Lab Spiral classifiers suitable for dewatering, medium drainage and desliming and wet and dry classifying for ore, Non-metallic materials, etc. Spiral classifier is a type of classifying equipment which realizes mechanical classification under the principle that materials settle in the liquid at different speeds due ... The rotation speed of the commonly used spiral classifier is. To obtain coarse overflow, the speed of the spiral with a diameter of 2 m should not exceed 6 r/min, and with a diameter of 1 m or more should be controlled at 2-8 r/min. For example, for a spiral with a diameter of 0.3 m, in order to obtain a coarse overflow, the spiral speed can be ... Walker mining produce Submerged and hig weir double spiral classifier,Submerged and High-weir double spirals classifier. Product Introduction Spiral classifier is a common beneficiation equipment. It’s widely used in concentrators and ball mills to form a closed-circuit cycle and separate ore sand, or in gravity concentrators to classify ore ...Spiral classifier is mainly composed of the driving device, the spiral body, the groove body, the lifting mechanism, the lower seat and discharge valve. The machine base adopts channel steel, the body adopts welded steel plate. Screw shaft parts use the pig iron, and wear resistance. Working Principle:13.5.3.4 Spiral Concentrator. The spiral concentrator is a modern high-capacity and low-cost device. It is developed for concentration of low-grade ores and industrial minerals in slurry form. It works on a combination of solid particle density and its hydrodynamic dragging properties.It is evident that no linear classifier will be able to do a good job classifying spiral data where the boundary between two classes is a curve. A simple two layer network with RELU activation on the hidden layer automatically learns the decision boundaries and achieves a 99% classification accuracy on such a data set.Spiral classifier is composed of motor, reducer, cylindrical gear and bevel gear. 2. Spiral (left and right) It is composed of the hollow shaft, bracket, spiral blade, lining iron, etc. The hollow shaft is welded by seamless steel pipe, journal and flange. Wear-resistant life is the key in use, so the lining iron is made of wear-resistant ... In the changed post COVID-19 business landscape, the global market for Spiral Classifier estimated at US$1. 1 Billion in the year 2020, is projected to reach a revised size of US$1. 3 Billion by ...Jan 1, 2016 · The classifier designs differ mainly in the mode of removing the underflow and the overflow slurries. Immersed spiral or rakes are generally used for underflow slurries and an open launder carries the overflow. Figure 13.1 is a sketch of a spiral classifier where the spiral conveyor is installed within the bowl. The spiral operates along the ... Submerged Spiral Classifier Market Enigma on a Global Stage | Phenomenal Growth Outlook to 2030 Sep 8, 2023 ...The ball mill and spiral classifier work together, to be a close circuit grinding system, to control the materials to be grinded as you want.More details ple...Spiral Dewaterer model - SD Metso spiral dewaterer model SD is a robust evolution of the spiral classifier for reliable operations in mill scale handling. The spiral dewaterer with special designed spiral and enlarged pool area is able to handle large flows of effluents, offering a well dewatered mill scale product and a clear overflow ...As of 2023, our analysis indicates that the global Spiral Classifier market is poised to reach USD 1399.9 million by 2028, exhibiting a steady CAGR of 3.3% from 2023 to 2028. With a focus on ...XBM Mining is a leading global supplier of equipment and tools, service and technical solutions for the mining industry,especially specialized in ore benefic...Apr 13, 2023 · Spiral classifier is used for material classification with spirals used to stir and convey materials according to the difference in material settling velocities. It is a kind of gravitational and hydraulic classifiers. The specification of spiral classifiers is represented by the number and diameter of spirals. The concept of spiral classifiers cathodic protection presented in this paper may become an alternative to the anti-corrosion protection methods of machinery and equipment used now at the KGHM ...High Weir Spiral Classifier, one of the segments analyzed in the report, is projected to record 2.3% CAGR and reach US$827.7 Million by the end of the analysis period. Taking into account the ...The ball mill and spiral classifier work together, to be a close circuit grinding system, to control the materials to be grinded as you want.More details ple... Mokup of classifier, 2 principles, 1600 mm screw diameter. Still in use in several silica sand plant: wash drain and dedusting. spiral classifier 1600 | 3D CAD Model Library | GrabCAD The spiral classifier is widely applied for the following fields: combine with ball grinder into closed circulation for ore-sand separation in the ore separation plant; classify ore sand and fine sludge in gravity ore separation plant; classify the grain of ore pulp at the metal ore separation process; and remove sludge/water at the ore separation process.The classifier is mainly composed of transmission device, spiral body, trough, lifting mechanism, lower support (bearing) and discharge valve. Spiral Classifier Advantages: 1、Simple structure, easy to maintain. 2、Easy operation and stable performance. 3、Gravity connection with Ball mills; slurry pump conveying is not necessary.Apr 28, 2007 · spiral classifier consists of a sloping elongated . round-bottom tank and a sand-raking spiral [46]. The raw materials are fed to the central . section of the pool and flow to the weir while . Submerged Spiral Classifier Market Enigma on a Global Stage | Phenomenal Growth Outlook to 2030 Sep 8, 2023 ...spiral separator D series. water for the food industry. Contact. Flow: 2 m³/h - 100 m³/h. It serves to separate and wash sand present in water. Water enters in the decantation hopper, where solids, after separation, decant on the bottom. A screw, with a very slow rotation speed, collects all the solids from the bottom and ...May 15, 2016 · Spiral classifiers. A typical spiral classifier is shown in Fig. 1. The geometry of a spiral is characterized by the length or number of turns, the diameter, the pitch and the shape of the trough (Burt, 1984). The spiral feed is a mixture of water and ground particles that is gravity fed at the top of the spiral. The result of that the 900mm spiral classifier has the best beneficiation effect in the cases of the same grade concentrate ore. The scavenging effect of 900mm pitch spiral separator machine has the output of 3.42t/h, the productivity of 32.18%, the grade of concentrate mineral 17.46%, recovery rate 17.16%, and comprehensive efficiency of 27.74%.The rake classifier such as the Dorr classifier consists of a rectangular tank with a sloping/inclined bottom. The tank is provided with movable rakes (reciprocating rakes). The feed in the form of a suspension (slurry) is introduced continuously near the middle of the tank. The lower end of the tank has a weir overflow (discharge weir) from ...The classifier is mainly composed of transmission device, spiral body, trough, lifting mechanism, lower support (bearing) and discharge valve. Spiral Classifier Advantages: 1、Simple structure, easy to maintain. 2、Easy operation and stable performance. 3、Gravity connection with Ball mills; slurry pump conveying is not necessary.Our report on the Spiral Classifier Market provides a comprehensive overview of the current market trends and dynamics. It offers an in-depth analysis of the leading players in the market, along ...Sep 7, 2023 · Chapter 1: High Weir Spiral Classifier Market Product Definition, Product Types, Volume, and Revenue Analysis of Each Type in North America, Europe, Asia-Pacific, Latin America, Middle East, and ...

Spiral Classifier Wet classification is the art of solid-liquid separators i.e spiral separator, separating the solid particles in a mixture of solids and liquids into fractions according to particle size or density by methods other than screening.. Isla moon leaked onlyfans

spiral classifier

The 'Submerged Spiral Classifier Market' continues to adapt to shifting consumer demands and corporate needs, thus the forecast is still positive. The market is expected to experience significant ...A study was carried out to select the appropriate coatings for corrosion protection of the spiral classifier working at KGHM Polska Miedź S.A. Ore Concentration Plant. The abrasion resistance of selected protective coatings and wear-resistant linings was investigated using a DT-523 rotary abrasion tester with Taber CS-10 rubber abrasive discs. The average weight loss of the coatings after a ...Oct 20, 2017 · Mokup of classifier, 2 principles, 1600 mm screw diameter. Still in use in several silica sand plant: wash drain and dedusting. Jul 16, 2023 · Our report on the Spiral Classifier Market provides a comprehensive overview of the current market trends and dynamics. It offers an in-depth analysis of the leading players in the market, along ... The rotation speed of the commonly used spiral classifier is. To obtain coarse overflow, the speed of the spiral with a diameter of 2 m should not exceed 6 r/min, and with a diameter of 1 m or more should be controlled at 2-8 r/min. For example, for a spiral with a diameter of 0.3 m, in order to obtain a coarse overflow, the spiral speed can be ...The ball mill is for grinding 0-20mm to small powder. It works together with the spiral classifier, so the overflow slurry from the classifier is about 80% 200mesh powder. The oversize particle from the classifier will go back to the ball mill grinding again, to form a closed-loop.Sep 7, 2023 · Chapter 1: High Weir Spiral Classifier Market Product Definition, Product Types, Volume, and Revenue Analysis of Each Type in North America, Europe, Asia-Pacific, Latin America, Middle East, and ... on a slope, with interrupted rake or spiral blades to move the settled solids to a central discharge cone. Tank diameters vary from 4 to 250 ft. Tank depths at center are 2 to 3 ft for small units and up to 25 ft for larger units. Hydraulic classifiers of the sizer and super-sorter types, Figs. 7 and 8, are narrow, deep, rectangularIn this video, Jason describes the many benefits and uses of our Spiral Classifier, also called a Screw Conveyor, De-watering Screw, and Auger Conveyor. The ...Nov 28, 2022 · High Weir Spiral Classifier, one of the segments analyzed in the report, is projected to record 2.3% CAGR and reach US$827.7 Million by the end of the analysis period. Taking into account the ... Spiral classifiers suitable for dewatering, de-medium, desliming and wet and dry classifying in mine.This machine is mainly used in the production flow of me...May 15, 2016 · Spiral classifiers. A typical spiral classifier is shown in Fig. 1. The geometry of a spiral is characterized by the length or number of turns, the diameter, the pitch and the shape of the trough ( Burt, 1984). The spiral feed is a mixture of water and ground particles that is gravity fed at the top of the spiral. A study on physical beneficiation of platinum group metals (PGMs) flotation tailings was carried out by means of spiral classifiers and a gravity separator (Knelson Concentrator – KC-CVD 6 unit).Mokup of classifier, 2 principles, 1600 mm screw diameter. Still in use in several silica sand plant: wash drain and dedusting.Spiral classifier is used for material classification with spirals used to stir and convey materials according to the difference in material settling velocities. It is a kind of gravitational and hydraulic classifiers. The specification of spiral classifiers is represented by the number and diameter of spirals.Spiral classifiers suitable for dewatering, de-medium, desliming and wet and dry classifying in mine.This machine is mainly used in the production flow of me... EIMCO-K.C.P. Spiral Classifiers are mechanically the devices are powerfully built, and functionally they are versatile and flexible. Today’s worldwide acceptance of EIMCO-K.C.P. Classifiers for washing and dewatering pulps, and in closed-circuit grinding is the result of many years of experience in solving wet classification problems..

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