A kind of flotation tailings slime step reduction process

Abstract

The invention discloses a stepwise decrement recovery process for flotation tailings coal. The flotation tailings are continuously added to a first-stage high-efficiency thickener, the first-stage concentrated underflow is evenly mixed with the FBS tailings, and the overflow of the first-stage high-efficiency thickener is transported to the second stage through pipelines. First-stage thickener; the first-stage concentrated underflow mixed with FBS tailings enters the FBS tailings dewatering screen for dehydration treatment, and the de-intermediation on the screen is transported to the first centrifuge for processing to obtain medium coal products, and the water under the screen and the first centrifuge The centrifugal liquid of the machine is transported to the medium gangue classifying cyclone through the pipeline for sorting, and the sorting underflow is transported to the coarse coal slime dewatering screen for dehydration to obtain medium coal products; the second-stage thickener is filled with chemicals, and the first-stage high-efficiency thickener overflows The overflow of the middle gangue graded cyclone is transported through the pipeline to the second-stage thickener for the second-stage concentration treatment, and the bottom flow of the second-stage concentration enters the concentration and classification cyclone for the third-stage concentration treatment; the present invention performs multi-stage classification on the flotation tailings Concentrate, reduce the amount of slime step by step, and reduce the input amount of filter press and drying links.

Description

technical field [0001] The invention relates to the technical field of recovery of flotation tailings, in particular to a process for recovery of flotation tailings by step reduction. Background technique [0002] Coal slime is a by-product produced during the washing process of the coal preparation plant. Its main component is the tailing coal produced by the flotation operation. The particle size is 0-0.5mm, and the ash content is generally between 45%-60%. With the improvement of mining mechanization and the continuous decline of raw coal properties, the amount of slime produced in the coal washing process has increased, and the treatment of flotation tailings has become a difficult point for various coal preparation plants. The coal slime treatment link often becomes the key factor that the coal slime water treatment process does not meet the production demand, resulting in the accumulation of coal slime in the circulating water, a vicious circle, and restricting product...

AI Technical Summary

Problems solved by technology

[0004] In actual production, due to problems such as the overflow of the grading cyclone and the wear and tear of the curved screen and the centrifuge screen, some coarse slime enters the fine slime system, and the amount of slime will inevitably increase.

Secondly, although the filter press is a special equipment for recovering fine-grained coal slime, its stand-alone processing capacity is small, and the filter cake after filter press dehydration has high moisture content, is easy to stick into agglomerates, and has poor looseness, so it cannot be directly mixed into medium coal.

Then, according to the requirements of environmental protection policy, the amount of air dust emission limits the drying treatment of coal slime

In addition, due to the gradual scarcity of natural gas resources, the limited use of natural gas in certain periods of time by production enterprises, and the high price of natural gas, the drying and processing capacity of coal slime has been severely restricted. If the amount of coal slime to be dried is large, the production cost of the enterprise will inevitably increase

[0005] In summary, the lack of coal slime water treatment system, which is a key process of coal preparation plant, has seriously affected production and cannot meet the increasingly stringent environmental protection control. Necessary technical transformation is required to reduce the amount of coal slime that needs to be filtered and dried

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