Multi-stage sedimentation rake-free concentration device comprising layer-drop diversion sedimentation screen

Abstract

The invention relates to a multi-stage sedimentation rake-free concentration device comprising a layer-drop diversion sedimentation screen. The device comprises a central tank body, a diversion settling area is arranged on the outer side of the central tank body, the diversion settling area comprises a layer-drop diversion sedimentation screen and a magnetism gathering sprayer, the layer-drop diversion sedimentation screen comprises a plurality of third diversion settling subgroups which are sequentially arranged downwards along the outer wall of the central tank body, in every two adjacent settling tanks, slime water flowing out from the settling tank at the upper portion is flown into the settling tank at the lower portion, each third diversion settling subgroup comprises a settling tank, the bottom plates of the settling tanks are provided with third underflow discharge ports for discharging settled fine coal slime, and completely settled water is output from a third overflow discharge pipe at the output end of the bottommost third diversion settling subgroup. According to the invention, the diversion settling area uses the layer-drop diversion sedimentation screen and sequentially passes through all the third diversion settling subgroups, so that step-by-step settling is achieved, fine coal slime and settled water are discharged from different pipes, and concentration is achieved.

Description

technical field [0001] The invention relates to the field of coal slime water treatment, in particular to a multi-stage subsidence non-rake concentrator comprising a layered subsidence diversion screen. Background technique [0002] In the coal washing process, the slime water treatment, as the finishing link of the washing process, is the key to the effective collection and utilization of coal slime and the closed cycle of washing water, and the thickening device as the carrier of coal slime water treatment and the key equipment for processing has been obtained It is widely used and is of great significance to the closed circulation of washing water, the full utilization of underflow concentrate and environmental protection. [0003] With the integration and large-scale of coal washing plants, the processing capacity has been greatly increased, and the output of coal slime water and the content of fine slime in coal slime water have also increased significantly. Some equip...

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Problems solved by technology

[0003] With the integration and large-scale of coal washing plants, the processing capacity has been greatly increased, and the output of coal slime water and the content of fine slime in coal slime water have also increased significantly. Some equipment has reached the specifications of 45m and above, but due to the finer fine mud and the increase in processing capacity, the settlement time period is poor, and the settlement effect is poor. The fine mud in the washing circulating water cannot be effectively removed, which will cause coal The quality of washing is seriously affected, so many coal preparation plants have added two-stage concentration or even three-stage concentration to further purify the washing circulating water, which will take up a lot of land, and there are still residual flotation stages in the slime water that have not been completely The recovered coal foam, resulting in the waste of clean coal, resulting in economic losses

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