Harmless treatment method for sodium alkali desulfurization waste solution

A technology for harmless treatment and desulfurization of waste liquid, applied in chemical instruments and methods, inorganic chemistry, alkali metal compounds, etc., can solve the problem of low utilization rate of inorganic salts, improve resource utilization rate, reduce the difficulty of salt extraction, The effect of mild reaction conditions

Active Publication Date: 2015-11-11
山西恒鑫宇环保科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The present invention aims at the problem that the utilization rate of inorganic salts is not high in the existing desulfurization waste liquid treatment technology, and the COD, ...

Method used

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  • Harmless treatment method for sodium alkali desulfurization waste solution
  • Harmless treatment method for sodium alkali desulfurization waste solution
  • Harmless treatment method for sodium alkali desulfurization waste solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The waste liquid used in this example is the desulfurization waste liquid produced by the coking gas in the coking plant using the sodium alkali wet oxidation method to remove hydrogen sulfide. Take 100mL of the desulfurization waste liquid. The main components of the desulfurization waste liquid are sodium thiocyanate and thiosulfuric acid. Sodium, sodium sulfate, sodium sulfite, sodium carbonate, sodium bicarbonate, suspended sulfur, NH 3 -N, sulfide, COD Cr .

[0031] The first step is to add sulfuric acid to 100mL of desulfurization waste liquid to adjust the pH to 2. At the same time, sulfuric acid reacts with sodium thiosulfate, sodium carbonate and sodium bicarbonate. The main chemical reactions are as follows;

[0032] Na 2 S 2 o 3 +H 2 SO 4 →H 2 SO 3 +S+Na 2 SO 4

[0033] Na 2 CO 3 +H 2 SO 4 →H 2 O+CO 2 +Na 2 SO 4

[0034] 2NaHCO 3 +H 2 SO 4 →H 2 O+2CO 2 +Na 2 SO 4

[0035] The desulfurization waste liquid was filtered by suction fil...

Embodiment 2

[0044] The waste liquid used in this example is the desulfurization waste liquid produced by the coking gas in the coking plant using the sodium alkali wet oxidation method to remove hydrogen sulfide. Take 100mL of the desulfurization waste liquid. The main components of the desulfurization waste liquid are sodium thiocyanate and thiosulfuric acid. Sodium, sodium sulfate, sodium sulfite, sodium carbonate, sodium bicarbonate, suspended sulfur, NH 3 -N, sulfide, COD Cr .

[0045] In the first step, sulfuric acid is added to 100 mL of desulfurization waste liquid to adjust the pH to 4, and sulfuric acid reacts with sodium thiosulfate, sodium carbonate, and sodium bicarbonate at the same time. The main chemical reactions are as follows;

[0046] Na 2 S 2 o 3 +H 2 SO 4 →H 2 SO 3 +S+Na 2 SO 4

[0047] Na 2 CO 3 +H 2 SO 4 →H 2 O+CO 2 +Na 2 SO 4

[0048] 2NaHCO 3 +H 2 SO 4 →H 2 O+2CO 2 +Na 2 SO 4

[0049] The desulfurization waste liquid was filtered by suc...

Embodiment 3

[0058] The waste liquid used in this example is the desulfurization waste liquid produced by the coking gas in the coking plant using the sodium alkali wet oxidation method to remove hydrogen sulfide. Take 100mL of the desulfurization waste liquid. The main components of the desulfurization waste liquid are sodium thiocyanate and thiosulfuric acid. Sodium, sodium sulfate, sodium sulfite, sodium carbonate, sodium bicarbonate, suspended sulfur, NH 3 -N, sulfide, COD Cr .

[0059] In the first step, sulfuric acid is added to 100 mL of desulfurization waste liquid to adjust the pH to 3, and sulfuric acid reacts with sodium thiosulfate, sodium carbonate, and sodium bicarbonate at the same time. The main chemical reactions are as follows;

[0060] Na 2 S 2 o 3 +H 2 SO 4 →H 2 SO 3 +S+Na 2 SO 4

[0061] Na 2 CO 3 +H 2 SO 4 →H 2 O+CO 2 +Na 2 SO 4

[0062] 2NaHCO 3 +H 2 SO 4 →H 2 O+2CO 2 +Na 2 SO 4

[0063] The desulfurization waste liquid was filtered by suc...

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Abstract

The invention discloses a harmless treatment method for a sodium alkali desulfurization waste solution. The method comprises: the desulfurization waste solution is adjusted in pH value by sulfuric acid and is filtered and pre-treated; then hydrogen peroxide is added to be uniformly mixed and oxygen is blown; wet oxidation reaction is carried out at high temperature and high pressure; sodium sulfite and elemental sulfur in the desulfurization waste solution are oxidized to sodium sulfate, organic matters are oxidized to carbon dioxide and water, and sodium thiocyanate is not oxidized and is continuously retained in the desulfurization waste solution; after reaction, the desulfurization waste solution is settled and separated to obtain solid sodium sulfate and a clean liquid, wherein the clean liquid is fed to a spraying drier for vacuum spraying and drying; water vapor generated by drying is condensed and fed to a biochemical treatment workshop section of an enterprise to be treated so as to obtain the solid which is mixed salt of sodium sulfate and sodium thiocyanate; and the mixed salt is evaporated and crystalized or extracted and crystalized by virtue of an organic solvent to obtain sodium sulfate and sodium thiocyanate, respectively. The method is simple in process, and chemical products with economical benefits are recovered while the waste solution is treated, so that harmless treatment for the sodium alkali desulfurization waste solution is realized.

Description

technical field [0001] The invention relates to a harmless treatment method for desulfurization waste liquid in a coking plant, in particular to a treatment method for desulfurization waste liquid produced in the desulfurization process of a coking plant using a sodium-alkali wet oxidation method. technical background [0002] 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 is 1g m -3 ~2.5g m -3 . Both hydrogen sulfide and hydrogen cyanide are toxic gases. Their existence will not only seriously endanger people's health and corrode equipment, but also their combustion products will pollute the environment. Therefore, coke oven gas should be desulfurized and decyanidated before use. [0003] At present, the main method used in China to remove acid gases su...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D5/00C01C3/20
Inventor 李国强王宏宇刘改换武云霞张永发
Owner 山西恒鑫宇环保科技服务有限公司
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