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Comprehensive treatment method of high-concentration cyanogens-containing and thiocyanate-containing waste liquid

A technology for comprehensive treatment of thiocyanate, applied in chemical instruments and methods, neutralized water/sewage treatment, multi-stage water/sewage treatment, etc., can solve the problem of extremely high equipment conditions, increased operating costs, and unfavorable environmental protection and other problems, to achieve the effect of simple and feasible operation, lower reaction temperature, and save the use of Fe salt catalyst

Active Publication Date: 2010-10-13
天津天达联合工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] It can be seen that if the existing technology is used to simultaneously remove CN in the desulfurization waste liquid - and SCN - , requires a high temperature and high pressure reaction environment of 325°C, which requires extremely high equipment conditions and consumes a lot of energy; hydrogen peroxide degrades SCN - In the process, it is necessary to add Fe salt as a catalyst, which increases the operating cost, and at the same time reacts to generate HCN, which is not good for environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Using vacuum carbonate circulating waste liquid as raw material, CN - The content is 13.84g / L, SCN - The content is 16.45g / L, and the solution also contains a relatively high content of CO 3 2- with HCO 3 - , the pH value of the solution is 9.0. the raw material in the absence of H 2 o 2 In the presence of high temperature hydrolysis reaction, for comparison. The experimental conditions and results are shown in Table 1.

[0030] Table 1. Experimental results of pyrohydrolysis reaction

[0031] sample

Embodiment 2

[0033] Using vacuum carbonate circulating waste liquid as raw material, CN - The content is 13.84g / L, SCN - The content is 16.45g / L, and the solution also contains a relatively high content of CO 3 2- with HCO 3 - , firstly adjust the pH value of the solution with H 2 SO 4 Adjusted to 5.0. The total amount of hydrogen peroxide added to the reactor is [H 2 o 2 ]: [SCN - ]=2.5 (molar ratio), wherein disposable desulfurization waste liquid 1Kg and account for hydrogen peroxide to add gross weight 50% H 2 o 2 Add to the reactor, raise the temperature to 150°C and react for 1h, then remove the remaining 50% H within 0.5h 2 o 2 Continue to add to the reactor and fully react under stirring. After the reaction was completed, the material was cooled to room temperature, and the results were analyzed in Table 2.

Embodiment 3

[0035] Using vacuum carbonate circulating waste liquid as raw material, CN - The content is 10.03g / L, SCN - The content is 12.10g / L, and the solution also contains a relatively high content of CO 3 2- with HCO 3 - . Maintain the original pH value of the raw material at 10.1. The total amount of hydrogen peroxide added is [H 2 o 2 ]: [SCN - ]=3.2 (molar ratio), wherein disposable desulfurization waste liquid 1Kg and accounting for hydrogen peroxide add gross weight 40% H 2 o 2 Add to the reactor, raise the temperature to 160°C for 0.5h, and then remove the remaining 60% H within 1h 2 o 2 Continue to add to the reactor and fully react under stirring. After the reaction was completed, the material was cooled to room temperature, and the results were analyzed in Table 2.

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PUM

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Abstract

The invention discloses a comprehensive treatment method of a high-concentration cyanogens-containing and thiocyanate-containing waste liquid. The method comprises the following steps of: (1) regulating the pH value of a decarbolizing waste liquid to be between 5 and 10; (2) adding the decarbolizing waste liquid and oxydol accounting for 40-50 percent of the total weight of the oxydol to be added into a reactor in the reactor at the same time, raising the temperature to react for 0.5-1h at 150-180 DEG C, continuously adding the remained oxydol accounting for 60-50 percent of the total weight of the oxydol into the reactor between 0.5h and 1.5h to fully react under stirring, wherein the molar ratio of [H202]:[SCN-] added in the reactor is 2.5-4; and (3) cooling materials to the room temperature and discharging. In the method, CN- and SCN- are treated in one operation unit at the same time, and the synergy of two methods of oxydol oxidation and high-temperature hydrolysis is utilized, thereby the usage of Fe salt catalyst is saved, and the reaction temperature in the high-temperature hydrolysis step is lowered at the same time.

Description

technical field [0001] The invention relates to a method for treating high-concentration cyanide- and thiocyanate-containing waste liquid, in particular to a treatment method for desulfurization waste liquid produced during the vacuum carbonate process in a coke oven gas purification project. Background technique [0002] During the coking process, the coke oven gas contains about 4-8g / m 3 H 2 S and 0.15 ~ 2g / m 3 HCN. If not removed, contains H 2 When the gas of S and HCN is burned as fuel, a large amount of SO will be produced 2 and NOx, resulting in serious air pollution. As a mature and reliable desulfurization process, the vacuum carbonate method is widely used in the petrochemical and fertilizer industries. This method uses 1-3% lye to wash the H in the gas. 2 S and HCN, then desorbed H by vacuum 2 S and HCN to regenerate the solution. Thereafter, in order to improve the regeneration effect of lye, the H 2 S product. [0003] In the vacuum carbonate process, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/66C02F101/18
Inventor 朱健
Owner 天津天达联合工程技术有限公司
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