Method for agglomerating and sorting fine coal slime by high-shearing oil

Abstract

The invention discloses a method for agglomerating and sorting fine coal slime by high-shearing oil. The method comprises the following steps: a. ore slurry formed by coal slime and water enters an ore slurry pre-treating device to be mixed; b. non-polar hydrocarbon-type oil is added into the ore slurry pre-treating device in a mixing process; c. slurry ore which is mineralized and mixed enters a high-shearing reaction kettle though a slag slurry pump to be treated; d, the coal slime subjected to a high-shearing oil agglomerating process enters a hydrocyclone to be graded; and e. fine-grain tailings which are not agglomerated enter an overflowing hole of the hydrocyclone and agglomerated fine coal enters a bottom flowing hole of the hydrocyclone. The method has the beneficial effects that the fine-grain coal is selectively agglomerated through high-speed shearing to form fine coal flocs with great granularity and relatively high strength; then the fine coal flocs are separated from fine gangue grains by adopting a cyclone grading method; and a sorting process is simplified and the coal slime with great content of high-ash fine slime can be sorted, so that the aim of efficiently sorting the fine-grain coal slime is realized.

Description

technical field [0001] The invention relates to a sorting method, in particular to a method for high-shear oil agglomeration and sorting of fine coal slime. Background technique [0002] With the improvement of coal mining mechanization and deepening of mining depth, the geological conditions of coal resources have gradually deteriorated, the proportion of fine-grained and ultra-fine-grained coal slime in the raw coal has increased sharply, and the content of high-ash and difficult-to-separate ultra-fine slime increasing trend. Coal is a non-renewable resource. With the continuous reduction of coal reserves, the efficient and clean utilization of coal slime resources has important research value and practical significance. It is also the focus and difficulty of efficient separation and utilization of coal resources. [0003] At present, flotation is the most mature and effective method for sorting fine-grained pulverized coal, and is widely used in industrial production. I...

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Problems solved by technology

[0004] However, when the content of high-ash fine slime in the coal slime is large, the high-ash fine slime affects flotation through processes such as water mechanical entrainment and coal particle surface covering, and it is very easy to cause pollution of high-ash fine slime to flotation clean coal and low-ash fine slime. The loss of clean coal makes it difficult for flotation to achieve an ideal sorting process, resulting in the ash content of flotation clean coal not meeting the product quality requirements and loss of recovery rate of clean coal combustibles

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