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Coal washing wastewater treatment process

A technology for coal washing wastewater and treatment process, which is applied in mining wastewater treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc. Problems such as the impact of coal washing wastewater, to achieve the effect of improving settlement performance, reducing chemical costs, and reducing production

Inactive Publication Date: 2020-07-28
袁中帮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN105712494B discloses a method for coagulation treatment of mining wastewater with microbial flocculants and surfactants, which solves the problems of large amount of microbial flocculants and long flocculation time, but it is limited to the treatment of simulated wastewater. It is difficult to have a significant impact on the colloidal coal washing wastewater in the mining wastewater
Can not give full play to the actual role of microbial flocculants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Water quality of coal washing wastewater in a coal mine: pH value: 8.76, SS: 64.618g / L, COD: 19877mg / L;

[0034] A coal washing wastewater treatment process is characterized in that it comprises the following steps:

[0035] (1) Take the surplus sludge produced by the coal mine water treatment plant;

[0036] (2) The remaining sludge obtained in step (1) is subjected to freezing treatment, and the remaining sludge after the freezing treatment is subjected to high-temperature steam wall breaking treatment. During the high-temperature steam wall breaking treatment, ultrasonic crushing is performed for 10-25 minutes, and then the After one centrifugation, take the centrifuge supernatant to obtain the remaining sludge flocculant;

[0037] (3) add lime suspension to the pretreated coal washing wastewater, and stir, the lime suspension is a concentration of 3%, and the dosage is 2g / L; the pretreatment includes grid, hydraulic sieving, The hydraulic sieving removes particles...

Embodiment 2

[0043] Mine water quality and coal washing wastewater water quality are with embodiment 1;

[0044] Experimental condition is with embodiment 1;

[0045] The solid waste generated by the solid-liquid separation, after the solid waste is dehydrated and dried, is added with caustic soda according to a mass ratio of 10:1, calcined and ground to 0.05-0.2mm, and the calcined product is added with hydrochloric acid solution and / or acid mine wastewater, adjust the pH to 3-5, stir under heating conditions for 60min, cool down to room temperature after the reaction, and remove the waste residue to obtain a solution containing polyaluminum iron calcium silicate; the polyaluminum iron calcium silicate Mixing the excess sludge flocculant with the excess sludge flocculant in a volume ratio of 5:30 to replace the excess sludge flocculant in step (4);

[0046] Effluent pH value: 8.07, SS: 89g / L, COD: 56mg / L.

Embodiment 3

[0048] Mine water quality and coal washing wastewater water quality are with embodiment 1;

[0049] Experimental condition is with embodiment 1;

[0050] The solid waste generated by the solid-liquid separation is dehydrated and dried, then calcined, and then the calcined residue is ball-milled to prepare a porous material with a particle size of 1-5mm, and the porous material is also added in the step 4 material, the calcination is carried out in a calcination furnace, the sintering temperature in the calcination furnace is 1250-1800°C, and the dosage of the porous material is 5-9g / L;

[0051] Effluent pH value: 7.93, SS: 98g / L, COD: 69mg / L.

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PUM

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Abstract

The invention discloses a coal washing wastewater treatment process. Residual sludge, lime and the like of a coal mine water treatment plant are used as main flocculants, according to the method, degradation-resistant organic matters and metal ions influencing chromaticity and turbidity of water are not introduced, solid wastes generated after coal washing wastewater is treated by adopting a microbial flocculant and lime are calcined, and in calcinations, the solid wastes contain the microbial flocculant and pulverized coal, so that the use amount of fuel in a calcining furnace is reduced, andmeanwhile, the yield of coal mine wastes is effectively reduced.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a coal washing wastewater treatment process. Background technique [0002] Wet coal preparation requires a lot of water. Taking jigging coal washing as an example, 3-5 cubic meters of circulating water is needed for every 1 ton of raw coal selected, and some clean water needs to be added, and this water will turn into waste water containing a large amount of oil and fine particles. This kind of coal washing water containing suspended particles with a particle size of less than 1mm is called coal slime water, also called coal washing wastewater. [0003] In the actual production process, coal washing wastewater is a weakly alkaline stable colloidal dispersion system, which has the following remarkable characteristics: high concentration of suspended solids (50-90g / L), high concentration of COD, high content of fine particles (less than 0.075mm The particle content ...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F1/52C02F103/10
CPCC02F3/34
Inventor 袁中帮李根解晖范誉委刘旋
Owner 袁中帮