A deep clarification system for coal slime water and its treatment process

Abstract

The invention discloses a coal slime water deep clarification system, and a treatment method thereof. The coal slime water deep clarification system comprises a thickener; a thickener internal concentration on-line monitoring system which comprises a calibration part and a thickener internal concentration on-line monitoring part; a coal slime water automatic reagent feeding system which comprises successively connected a coal slime water feeding detection unit, a monitoring operation unit, and a reagent feeding unit; a reagent dispersing system which comprises a double-impeller heating high-efficiency preparation barrel communicated with the reagent feeding unit, and a reagent feeding buffer barrel; the bottom of the reagent feeding buffer barrel is provided with two feed outlets which are used for communicating a constant amount reagent feeding channel and a variable amount reagent feeding channel; reagents in the constant amount reagent feeding channel and the variable amount reagent feeding channel are both delivered into a coal slime water feed inlet pipe; the thickener internal concentration on-line monitoring system, the coal slime water automatic reagent feeding system, and the reagent dispersing system are all connected with a control system via electric connection. The coal slime water deep clarification system is capable of realizing real-time monitoring and correction, and saving reagents, and is more perfect.

Description

technical field [0001] The invention belongs to the technical field of coal preparation, and in particular relates to a coal slime water deep clarification system and a treatment process thereof. Background technique [0002] Coal slime water treatment is one of the most important links in all coal preparation plants except dry selection. The quality and perfection of the slime water treatment process directly affects whether the production of the coal preparation plant can go smoothly. It is one of the most important factors to evaluate the technology and management level of a coal preparation plant. The quality of the slime water treatment effect even affects Determine the economic and social benefits of a mining area. The coal slime water system is responsible for recovering coal slime and water resources, and its ultimate goal is to meet environmental protection requirements and realize a closed-circuit washing water cycle. [0003] In the treatment of slime water, tec...

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Problems solved by technology

[0004] In the prior art, the more advanced automatic dosing method at home and abroad is the "flocculant automatic adding system and method thereof" disclosed in the Chinese patent document CN1958116A, which detects the concentration and flow of the slime water according to the concentration meter and the flow meter, and is controlled by the industrial computer. The pump is controlled to add flocculant, the sensor detects the concentration of overflow water, and then the industrial computer judges the concentration of overflow water to decide whether to start the pump to add medicine to the concentration tank; this system and method saves the amount of flocculant and improves the clean coal production rate, but There are the following problems, which lead to its not being popularized and used in coal preparation plants: (1) The system is not perfect, only provides an automatic dosing method, and does not explain how to add chemicals and what means to disperse the chemicals, so as to achieve deep clarification of slime water and The purpose of saving medicine; (2) The system adopts an open-loop mode, which cannot monitor, feed back and correct the added medicine dosage. During the use process, there is often a deviation between the actual dosage of the medicine added and the set dosage, resulting in Waste of chemicals; (3) Taking the overflow concentration of the concentrator as the only assessment index is inconsistent with the actual situation. In the deep clarification of coal slime water, engineers and technicians usually care about two issues. The first is the concentration distribution of the bed in the concentrator The second is the concentration of overflow water. If you only care about the concentration of overflow water and ignore the changes in the bed layer in the concentrator, and blindly add chemicals, it will cause the phenomenon of "raking" in the concentrator (that is, because the bed layer in the concentrator is too thick, the concentration If it is too large, the rake in circular motion will stop moving, and the material cannot be discharged from the bottom outlet of the thickener), which will seriously affect the normal production of the coal preparation plant

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