Coal dressing method and coal dressing system with greatly reduced coal slime product productivity

Abstract

The invention relates to a coal dressing method and a coal dressing system with greatly reduced coal slime product productivity. The method comprises an existing water medium coal dressing method anda method of mixing and dehydrating concentrated fine fraction coal slime water and main clean coal. In the water medium coal dressing method, a main clean coal product is separated, the fine fractioncoal slime water is then concentrated to high concentration coal slime water, and the concentrated high concentration coal slime water and the main clean coal product are mixed to be dehydrated. The main clean coal is clean coal greater than certain granularity. The granularity range is 0.2-30 mm. The fine fraction coal slime water is coal slime water greater than certain granularity. The granularity range is 0.2-30 mm. The method and the system have the advantages of reducing the fine fraction coal slime productivity, increasing the clean coal product productivity, increasing the economical benefit and reducing the product management difficulty and are economical and efficient coal dressing method and coal dressing system in an existing coal dressing industry.

Description

[0001] Technical field [0002] The invention relates to a coal preparation method and process, in particular to a coal preparation method and a coal preparation system in which the yield of coal slime products is greatly reduced. Background technique [0003] At present, the most commonly used jigging coal preparation method and dense medium coal preparation method in domestic and foreign coal preparation plants use water as the main medium in the separation process. After the raw coal enters the water, the fine coal slime below 0.3mm in the raw coal is mainly used The filter press is used for dehydration and recovery. The coal slime after the filter press cannot be directly mixed into clean coal products for sale due to reasons such as high water content and lumpy cake. In the end, it can only be sold separately at a low price or disposed of as waste. , coal slime products are low in value and difficult to handle, so reducing the output of coal slime products has always been...

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Problems solved by technology

[0003] At present, the most commonly used jigging coal preparation method and dense medium coal preparation method in domestic and foreign coal preparation plants use water as the main medium in the separation process. After the raw coal enters the water, the fine coal slime below 0.3mm in the raw coal is mainly used The filter press is used for dehydration and recovery. The coal slime after the filter press cannot be directly mixed into clean coal products for sale due to reasons such as high water content and lumpy cake. In the end, it can only be sold separately at a low price or disposed of as waste. , coal slime products are low in value and difficult to handle, so reducing the output of coal slime products has always been the key direction of industry research. For example, the coal slime sedimentation centrifuge developed by equipment manufacturers can separate -0.5mm coal slime for centrifugal dehydration and recovery, and The moisture is low, and the material is loose. For example, in some areas, the coal slime after dehydration by pressure filtration is dried to reduce the moisture content of the coal slime and form a loose shape. However, these methods have high cost, high investment, and Issues that don't work well

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