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Resource method of waste liquid from coke oven gas desulphurization and decyanation

A technology for desulfurization, decyanation and coke oven gas, which is applied in the field of waste recycling and treatment, and can solve problems such as difficulties in the precipitation of sulfide and cyanide

Inactive Publication Date: 2013-05-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the invention patent with the patent number CA85100375A mentions a method of using soluble ferrous salts to first precipitate sulfides, then precipitate cyanides, and then treat the resulting "coarse white pulp" (a mixture of ferrocyanides) with acid to remove impurities. Obtain the method for iron blue product, this method has its limitation to waste liquid with high sulfide content, because cyanide and sulfide content are all high, it is difficult to precipitate sulfide and cyanide respectively by two steps, and produce by adding acid The treatment of acidic wastewater containing a large amount of sulfide produced by the removal of impurities is also a big problem

Method used

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  • Resource method of waste liquid from coke oven gas desulphurization and decyanation

Examples

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Effect test

Embodiment 1

[0023] Embodiment 1: small test of vacuum potassium carbonate method desulfurization and decyanation waste liquid treatment, the total cyanide concentration of the former waste liquid is 508mg / L, S 2- It is 123mg / L. After adding ferric sulfate for reaction, the temperature is 50°C, the pH is 6.5, and the cyanide in the effluent is about 21mg / L, S 2- Less than 1.8mg / L, the removal rate is greater than 95%. After sedimentation and filtration, carbon disulfide is added for extraction. On average, about 0.84g of ferrocyanide and 0.11g of sulfur can be recovered per liter of wastewater.

Embodiment 2

[0024]Embodiment 2: small test of vacuum potassium carbonate method desulfurization and decyanation waste liquid treatment, the total cyanide concentration of the former waste liquid is 9786mg / L, S 2- It is 2893mg / L. After adding ferric chloride for reaction, the temperature is 30°C, the pH is 5.5, and the cyanide in the effluent is about 470mg / L, S 2- Less than 15mg / L, the removal rate is greater than 95%. After sedimentation and filtration, carbon disulfide is added for extraction. On average, about 16.1g of ferrocyanide and 2.6g of sulfur can be recovered per liter of wastewater.

Embodiment 3

[0025] Embodiment 3: small test of vacuum potassium carbonate method desulfurization and decyanation waste liquid treatment, the total cyanide concentration of the original waste liquid is 13774mg / L, S 2- It is 3758mg / L. After adding ferric sulfate for reaction, the temperature is 50°C, the pH is 5.0, and the cyanide in the effluent is about 678mg / L, S 2- Less than 35mg / L, the removal rate is greater than 95%. After sedimentation and filtration, carbon disulfide is added for extraction. On average, about 22.8g of ferrocyanide and 3.4g of sulfur can be recovered per liter of wastewater.

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Abstract

The invention provides a resource method of a waste liquid from coke oven gas desulphurization and decyanation. The method is also suitable for other waste liquids containing high-concentration cyanide and sulfide. Ferric salt is employed to oxidize sulfide in the waste liquid to elemental sulfur, meanwhile Fe<2+> is generated to react with cyanide to generate precipitates. After decyanation and desulphurization, the waste liquid is charged to a coking waste water biochemical treatment system for processing. The precipitates are washed and added with an extractant to extract the elemental sulfur and recover an elemental sulfur product; remaining ferrocyanide solid is treated with pickling, centrifuged and prepared into a ferrocyanide product. Equipment of the technology is simple and convenient for operation. Not only can simultaneous desulphurization and decyanation be realized to meet requirements of subsequent processing, but also resource of waste can be realized; therefore, the method has important environmental and economic significance.

Description

technical field [0001] The invention belongs to the field of waste recycling and treatment, and in particular relates to a method for recycling coke oven gas desulfurization and decyanation waste liquid. Background technique [0002] With the increasingly stringent national environmental protection regulations and the continuous enhancement of people's environmental protection awareness, H in the coke oven gas of coking plants 2 The pollution of S, HCN and their combustion products to the atmospheric environment has become increasingly prominent, seriously affecting the sustainable development of my country's coking industry. Therefore, it is imperative to purify coke oven gas by desulfurization and decyanation. During the coking process, about 30% to 35% of the sulfur in coal is converted into H 2 S and other sulfides, and NH 3 Together with HCN, etc., it forms impurities in gas, and H in coke oven gas 2 The content of S is generally 5g / m 3 ~8g / m 3 , the content of HCN...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C01B17/06C01C3/08
Inventor 刘晨明邢林林曹宏斌李玉平张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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