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Coke oven gas desulfurization waste liquid recycling method

A technology for desulfurization waste liquid and coke oven gas, which is applied in the direction of chemical instruments and methods, thiocyanate, ferricyanide, etc., can solve the problem that the remaining wastewater cannot meet the requirements of biochemical treatment, and the water quality of coke oven gas desulfurization waste liquid fluctuates greatly and is difficult to Obtaining high-purity products and other issues to achieve low cost, low price, and good market prospects

Active Publication Date: 2016-10-12
湖北民益环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not use other chemical additives, and the process flow is simple; but in actual production, the crystallization process requires high temperature control, and the water quality of coke oven gas desulfurization waste liquid fluctuates greatly, it is difficult to obtain high-purity products, and the remaining waste water Can not meet the requirements of biochemical treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A resource recovery method for coke oven gas desulfurization waste liquid. The steps of the resource-based method are:

[0028] Step 1. Filtration of coke oven gas desulfurization waste liquid, adding decolorant to the filtered coke oven gas desulfurization waste liquid at 20~40°C, the dosage of decolorant per ton of coke oven gas desulfurization waste liquid 10~25kg, let stand for 5~15min, and filter to obtain light yellow clear waste liquid.

[0029] Step 2. Send the light yellow clarified waste liquid into an evaporator, and evaporate to a concentrated solution at a temperature of 50-65°C and a vacuum of 0.06-0.07Mpa: the volume of the light yellow clarified waste liquid The ratio is 1: (5~8) to obtain the concentrated solution I, and then the concentrated solution I is centrifuged to obtain the mixed salt and the filtrate I.

[0030] Step 3, according to the volume ratio of water: organic eluent is 1: (1 ~ 2.5) to make a mixed eluent, at room temperature according...

Embodiment 2

[0035] A resource recovery method for coke oven gas desulfurization waste liquid. The steps of the resource-based method are:

[0036] Step 1. Filtration of coke oven gas desulfurization waste liquid, adding decolorizer to the filtered coke oven gas desulfurization waste liquid at 40~60°C, the dosage of decolorant per ton of coke oven gas desulfurization waste liquid 20~35kg, let it stand for 5~15min, and filter to obtain light yellow clarified waste liquid.

[0037] Step 2. Send the light yellow clarified waste liquid into an evaporator, and evaporate to a concentrated solution at a temperature of 60-75°C and a vacuum of 0.07-0.08Mpa: the volume of the light yellow clarified waste liquid The ratio is 1: (6~9) to obtain the concentrated solution I, and then the concentrated solution I is centrifuged to obtain the mixed salt and the filtrate I.

[0038] Step 3, according to the volume ratio of water: organic eluting agent is 1: (1.5 ~ 3) is made into mixed eluting agent, unde...

Embodiment 3

[0043] A resource recovery method for coke oven gas desulfurization waste liquid. The steps of the resource-based method are:

[0044] Step 1. Filtration of coke oven gas desulfurization waste liquid, adding decolorizer to the filtered coke oven gas desulfurization waste liquid at 60~80°C, the dosage of decolorant per ton of coke oven gas desulfurization waste liquid 30~50kg, let stand for 5~15min, and filter to obtain light yellow clear waste liquid.

[0045] Step 2. Send the light yellow clarified waste liquid into an evaporator, and evaporate to a concentrated solution at a temperature of 75-90°C and a vacuum of 0.08-0.09Mpa: the volume of the light yellow clarified waste liquid The ratio is 1: (8~10) to obtain the concentrated solution I, and then the concentrated solution I is centrifuged to obtain the mixed salt and the filtrate I.

[0046] Step 3, according to the volume ratio of water: organic eluting agent is 1: (2.5 ~ 4) is made into mixed eluting agent, under room...

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PUM

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Abstract

The invention relates to a coke oven gas desulfurization waste liquid recycling method. According to the technical scheme, a decolorising agent is added into filtered coke oven gas desulfurization waste liquid for discoloring to obtain faint yellow clarified waste liquid; the faint yellow clarified waste liquid is subjected to vacuum evaporation, concentrated liquid obtained after evaporation is centrifugally separated, and a salt mixture and filtrate I are obtained; an organic solventing-out agent and an extraction agent are used for refining the salt mixture, and potassium thiosulfate and potassium rhodanide are obtained; iron vitriol is added into the filtrate I, stirring is carried out, precipitate is obtained, acid pickling and centrifugation are carried out, and a ferric ferrocyanide product is obtained. The coke oven gas desulfurization waste liquid recycling method has the advantages of being easy to operate and low in cost; coke oven gas desulfurization waste liquid can meet the water quality requirements for biochemical treatment, the recycling rate of thiosulfuric acid radical and thiocyanate radical in the coke oven gas desulfurization waste liquid is high, and the product purity is high.

Description

technical field [0001] The invention belongs to the technical field of coke oven gas desulfurization waste liquid. In particular, the invention relates to a resource recovery method of coke oven gas desulfurization waste liquid. Background technique [0002] As a by-product of the coking process, coke oven gas is also an important energy and chemical raw material. Coke oven gas contains H 2 、CH 4 , CO, N 2 、H 2 S, HCN and other gases, among them, the existence of hydrogen sulfide and hydrogen cyanide will not only corrode the equipment, but also produce such as SO after combustion x , NO x If coke oven gas is used as a raw material to synthesize other chemical products, hydrogen sulfide and hydrogen cyanide will cause catalyst poisoning. Therefore, the removal of hydrogen sulfide and hydrogen cyanide in coke oven gas is the application of coke oven gas. premise. [0003] At present, coke oven gas desulfurization and decyanation processes at home and abroad are divided...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01B17/64C01C3/20C01C3/12
CPCC01B17/64C01C3/12C01C3/20C01P2006/80C02F1/001C02F1/04C02F1/265C02F1/281C02F1/283C02F1/285C02F1/38C02F1/5245C02F1/66C02F9/00C02F2209/06C02F2209/08
Inventor 任大军樊响张淑琴郭舒悦龚洁何小勇刘海
Owner 湖北民益环保科技有限公司
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