A slime water half-condensation flotation process

Abstract

A slime water condensation flotation process mainly includes the following steps: S1, one portion of floating pulp flows by gravity into a thickener, the other portion of the floating pulp flows by gravity into a slurry mixing device, and the proportion of the two parts is flexibly adjusted; S2, the floating pulp is completely clarified by quantificationally adding a flocculating agent to the thickener through a flocculating agent-adding device, and overflows are directly used as circulating water; S3, the pulp with the high concentration about 400g / L is sent into the slurry mixing device through an underflow pump and the pulp in the high concentration about 400g / L and the pulp with the low concentration about 40g / L in the slurry mixing device are intensely stirred by a blade wheel to be uniform to prepare the floating pulp with the concentration of 80-150 g / L; S4, the prepared pulp flows by gravity into a pulp preprocessor and flows by gravity into a flotation machine after the pre-mineralization is performed. In addition, a dispersant is quantificationally added into the slurry mixing device through a dispersant-adding device to eliminate the unfavorable influence of the flocculating agent on subsequent floatation links. The investment cost of a supplementary floatation system is reduced and the production cost of the consumption of floatation medicaments and the like is alsoreduced, and the stability of the slime floatation process index is guaranteed at the same time.

Description

technical field [0001] The invention belongs to the technical field of flotation, and in particular relates to a coal slime water semi-concentration flotation process. Background technique [0002] Flotation technology is the most economical and effective separation method of fine coal slime, and it is also an important method for deep separation of coal. With the improvement of coal mining mechanization, the amount of pulverized coal in the raw coal of the coal preparation plant is increasing, and the flotation operation becomes more and more important. Moreover, the flotation operation is also an important link in the slime water treatment system of the coal preparation plant, which plays an important role in realizing the closed circulation of the slime water and environmental protection. [0003] In order to ensure a suitable and stable concentration of the floating pulp, the coal preparation plants built in my country before the 1990s basically adopted the concentrated...

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Problems solved by technology

[0003] In order to ensure a suitable and stable concentration of the floating pulp, the coal preparation plants built in my country before the 1990s basically adopted the concentrated flotation process, but there are two disadvantages of the traditional concentrated flotation: 1. Based on the underflow large discharge process, the concentrated flotation process is adopted. The bottom flow of the machine is used for flotation feeding, and the concentration of the flotation is high, and more supplementary water needs to be added during the flotation process, resulting in an increase in the amount of circulating water; 2. Without adding any chemicals, the overflow of the concentrator has a high content of fine mud, and the reciprocating cycle, It affects the effects of gravity separation, flotation and other links, so the new coal preparation plants after the late 1990s basically adopted the direct flotation process

[0004] In recent years, in order to reduce production costs, various coal preparation plants often adopt the pre-deliming process. One of the problems brought about is that the concentration of coal slime water is low and the flow rate is large during direct flotation; The requirements are becoming more and more stringent, and there are more and more coal slime flotation systems in thermal coal preparation plants, but the proportion of powdered coal washing in thermal coal preparation plants is low, the production mode is flexible, and the concentration of slime water is low (most plants are less than 40g / L) and large fluctuations, resulting in a large amount of floating ore pulp, low concentration of coal slime water, large equipment selection, and high investment costs when supplementing the flotation system; during the production process, the floating concentration is low and fluctuates frequently, making it difficult to control process parameters , high drug consumption, unstable product indicators, high production costs

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