Commonly used trough classifiers include hydraulic classifying boxes, Dyval-type hydraulic classifiers and KPvalue="4" unitname="C">-4C classifiers. The hydraulic classification box is a free- falling classification device . When processing materials with high density and coarse particles, the water consumption is larger than that of the interference-type hydraulic classifier, and the discharge pipe is easy to block, and the classification effect is poor. But its simple structure, without power, reliable, it is widely used in tungsten, tin ore beneficiation plants. The hydraulic classification box is suitable for the treatment of materials with smaller particle size and more fine mud content.
The appropriate classification granularity is 2 O.value="74" unitname="mm">074mm, and the classification is less than 0.value="74" unitname="m">074m/n. The suitable concentration of ore is t8", -25%. When selecting the hydraulic classification box, it should be noted that the number of chambers in the classification box is compatible with the number of classification levels specified in the process, and the selected shaker and jump should be taken into account. The number of machine sets. The grit size analysis of the classification box before the shaker selection in a tin ore dressing plant is shown in Table 7.5-26. The Dyna type hydraulic classifier is an interference sedimentation classifier, which is suitable for processing dense density and granularity. Thicker ore. Table 7.5-26 of the unit area of ​​a certain tin ore dressing plant
| Grading box number | Grade box width mm | Grit tensile, mm | % of the meter | |||||||
| +1.2 | 1.2～O. 6 | 0.6 to 0.3 | 0.3～O. 15 | 0.15～ 0.074 | 0.074～ 0.037 | 0.037 | ||||
| Yield% | ||||||||||
| l 2 3 4 5 6 7 8 | 200 300 300 400 600 600 800 80D | 2.82 1.32 0.65 | 18.13 9.56 6.27 2.42 1.17 0.31 | 46.19 43.32 38.24 25.27 16.78 10.14 6.01 5.05 | 28.39 36.98 44.59 54.95 57.78 53.93 42.08 38.64 | 3.68 7.82 8.62 16.04 19.71 29.24 35.96 34.34 | 0.32 0.63 0.86 0.77 1.75 3.62 8.44 10.61 | 0.47 O. 37 0.77 0.55 2.81 2.76 7.51 11.36 | 100. OO 100j00 100.00 100.00 100.00 100.00 100. OO 100.00 | |
Table 7.5-27 200*200 Code Wal-type moisture classifier for processing tungsten ore production indicators
| Processing capacity | Give the pillar | Feed concentration | Grading efficiency, % | ||||
| Concentrator | t/h | Mm | % | One room | Second room | Three rooms | Four rooms |
| Pangushan Daji Mountain | 5~6 3.97 | 2—0 1.5～O | 20~'24 | 65～68 65～85 | 25～35 25～35 | 15～25 15～25 | 15～20 15～20 |
The production capacity is larger than that of the hydraulic classification box. The production indexes of the tungsten ore type hydraulic classifier for treating tungsten ore are shown in Table 7.5-27. The C type classifier is an interference sedimentation type hydraulic classifier. The main advantage is that the production capacity is large, the water consumption is small, the product concentration is large, the volume is small, and the classification efficiency is high. The processing capacity of KPvalue="4" unitname="C">-4C classifier in different ore feeding sizes is: feeding size, mm 1.4-0 0.3-O treatment capacity, t/h 20 10 4C type classifier The water consumption per unit throughput is value="2" unitname="m3">2m3/t, the rising water gauge pressure is 0.15--0.2MPa, and the feed concentration is generally 20--350/. The actual production operating conditions are listed in Table 7.5-28. The above three types of trough classifiers, such as the hydraulic classification box, the Dyval-type hydraulic classifier and the KPvalue="4" unitname="C">-4C classifier, are selected in addition to the units of the similar beneficiation plant. The calculation can be performed by using Equations 7.5 to 16. In this case, K = 0.7 to 0.8.
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