Coal slime water treatment system and treatment method thereof

Abstract

The invention discloses a coal slime water treatment system and a treatment method thereof. The coal slime water treatment system comprises a circulating precipitation device, a first conveying device, a filter pressing pre-treatment device, a pressing filter and a plate and frame filter; the circulating precipitation device is used for precipitating concentrated slurry; the first conveying device is used for connecting the circulating precipitation device and the filter pressing pre-treatment device; the filter pressing pre-treatment device is used for pre-treating the slurry; the pressing filter is used for carrying out solid-liquid separation on the supplied material of the filter pressing pre-treatment device; the plate and frame filter is used for carrying out solid-liquid separation on the supplied material of the filter pressing pre-treatment device. The coal slime water treatment system provided by the invention can sufficiently and simultaneously realize respective advantages of the pressing filter and the plate and frame filter, and can avoid respective disadvantages; the treatment capability is great and the efficiency is greatly improved; the purity of recycled circulating water is high, the content of the circulating water in the concentrated slurry is relatively low, and the energy consumption is relatively small; meanwhile, equipment in the system does not easily have faults, and the whole system can run stably and treat flexibly; the precipitation and concentration time of the slurry is shortened.

Description

technical field [0001] The invention relates to the field of coal slime wastewater treatment, in particular to a coal slime water treatment system and a treatment method thereof. Background technique [0002] Coal is the main energy source in China, accounting for 76% of the primary energy consumption structure. Coal is non-clean energy, which needs to be sorted and processed to reduce the content of minerals and harmful impurities as much as possible. At present, coal separation mostly adopts wet coal preparation, that is, water or a mixture of water is used as the separation medium. It is estimated that the current national annual water consumption for coal preparation is about 6.2 billion m 3 , The coal slime water after the selection is a suspension containing a large number of fine coal particles and other impurities. If it is discharged directly, it will cause great harm to the waters. Residual chemicals and various metal ions associated with coal in coal preparation...

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Problems solved by technology

[0003] In the existing coal slime water treatment system, there are disadvantages such as low treatment efficiency, high maintenance cost of the filter press, and low cleanliness of circulating water, especially in the water treatment system where the pressure filter and the plate and frame filter are used in parallel. The pressurized filter is an energy-saving, fully automatic operation, continuous discharge, and unattended dehydration equipment. The disadvantages are poor adaptability, low processing capacity, and the treatment effect on fine slime with high viscosity, small particle size, and high ash content. No, the filter cloth consumes a lot. The plate and frame filter is the most widely used dehydration equipment with strong adaptability and high solid recovery rate. The disadvantage is that the processing capacity is small, the filter cloth is easily blocked by the slurry, and the filter cloth consumes a lot. Manual on-duty operation is required, and the existing slime water treatment systems often do not give full play to the respective advantages of the pressurized filter and the plate-and-frame filter, resulting in the treatment effect of the system being 1 plus 1 less than 2. Therefore, continue to treat the existing slime water system optimization

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