Method for producing polymerized iron chloride by utilizing acid-washing waste liquid of steel

A technology of iron and steel pickling waste liquid and polyferric chloride, applied in the direction of ferric halide and other directions, can solve the problems of hidden safety hazards, high risk and high toxicity in the working environment, etc., to reduce post-processing costs, improve storage stability, and eliminate potential safety hazards. Effect

Inactive Publication Date: 2012-07-25
蓝保(厦门)水处理科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the preparation of polyferric chloride mainly adopts the method of passing chlorine gas through ferrous chloride in production. The chlorine gas used in this method is a Class A highly toxic chemical, and the working environment is high-risk and high-toxic, and there are potential safety hazards.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Add iron and steel pickling waste liquid and sodium phosphate in the reaction tank, the weight ratio of the above-mentioned two is 1: 0.02, fully stir evenly, obtain liquid material 1;

[0030] (2) continue to add sodium chlorate solution in above-mentioned liquid material one, carry out reaction at 80 ℃ to the content of ferrous chloride wherein is lower than 0.5%, obtain liquid material two, wherein said iron and steel pickling waste liquid and The mass ratio of sodium chlorate in dry basis is 1: 0.2;

[0031] (3) Add sodium carbonate to Fe in liquid material two 3+ with OH - The molar ratio is 1: 0.01, and the polymerization reaction is carried out at 80 ° C, and the reaction time is 20 minutes;

[0032] (4) After the reaction is completed, the polyferric chloride product is obtained, and the Fe in the product 3+ The content of Fe is 12-18%, the basicity is 15-20%, 2+ The content is less than 0.5%.

Embodiment 2

[0034] (1) Add steel pickling waste liquid and sodium dihydrogen phosphate and sodium phosphate compound in reaction tank, the weight ratio of above-mentioned two is 1: 0.05, fully stir, obtain liquid material 1;

[0035] (2) continue to add sodium chlorate solution in above-mentioned liquid material one, carry out reaction at 60 ℃ to the content of ferrous chloride wherein is lower than 0.5%, obtain liquid material two, wherein said iron and steel pickling waste liquid and The mass ratio of sodium chlorate in dry basis is 1: 0.8;

[0036] (3) Add sodium hydroxide to Fe in liquid material two 3+ with OH - The molar ratio is 1:0.05, and the polymerization reaction is carried out at 60 ° C, and the reaction time is 40 minutes;

[0037] (4) After the reaction is completed, the polyferric chloride product is obtained, and the Fe in the product 3+ The content of Fe is 12-18%, the basicity is 15-20%, 2+ The content is less than 0.5%.

Embodiment 3

[0039] (1) Add iron and steel pickling waste liquid and sodium dihydrogen phosphate in the reaction tank, the weight ratio of the above-mentioned two is 1: 0.1, fully stir evenly, obtain liquid material 1;

[0040] (2) continue to add sodium chlorate solution in above-mentioned liquid material one, carry out reaction at 70 ℃ to the content of ferrous chloride wherein is lower than 0.5%, obtain liquid material two, wherein said iron and steel pickling waste liquid and The mass ratio of sodium chlorate in dry basis is 1: 0.5;

[0041] (3) Add calcium oxide to Fe in liquid material two 3+ with OH - The molar ratio is 1: 0.03, and the polymerization reaction is carried out at 70 ° C, and the reaction time is 30 minutes;

[0042] (4) After the reaction is completed, the polyferric chloride product is obtained, and the Fe in the product 3+ The content of Fe is 12-18%, the basicity is 15-20%, 2+ The content is less than 0.5%.

[0043] In above embodiment, if need to improve Fe ...

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Abstract

The invention discloses a method for producing polymerized iron chloride by utilizing the acid-washing waste liquid of steel. The method for producing the polymerized iron chloride by utilizing the acid-washing waste liquid of the steel comprises the following steps of: (1) adding the acid-washing waste liquid of steel and a stabilizing agent into a reaction tank and fully stirring evenly so as to obtain a liquid material 1; (2) adding a sodium chlorate solution into the liquid material 1 continuously for reacting until the content of ferrous chloride in the mixture is lower than 0.5 percent so as to obtain a liquid material 2; and (3) adding a polymerization initiator into the liquid material 2 for carrying out a polymerizing reaction so as to obtain a polymerized iron chloride product after finishing the reaction. According to the method for producing the polymerized iron chloride by utilizing the acid-washing waste liquid of the steel, the polymerized iron chloride is prepared by utilizing the acid-washing waste liquid of the steel, the after-treatment cost of the acid-washing waste liquid of the steel industry is lowered, and resources are fully utilized; sodium chlorate is adopted as an oxidizing agent, the use of chlorine gas is avoided, a favorable production environment is formed, and the potential safety hazard is eliminated; and the method disclosed by the invention has simple technological process and low equipment investment and is suitable for industrialized production.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to a method for producing polyferric chloride by using iron and steel pickling waste liquid. Background technique [0002] In the steel processing industry, it is necessary to clean the surface of steel parts with hydrochloric acid solution to remove rust on the surface. During the pickling process, the hydrochloric acid in the hydrochloric acid solution is continuously consumed, and the divalent iron ions are continuously increased until the solution loses its cleaning ability, and the waste liquid produced at this time is the steel pickling waste liquid. The main components of the iron and steel pickling waste liquid are water, ferrous chloride, free acid and a small amount of impurities. Due to its high acid and salt content, it cannot be discharged directly. If it is to be neutralized and discharged, a large amount of alkali will be required, and high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/10
Inventor 王志巍吕奋志吕奋勇
Owner 蓝保(厦门)水处理科技有限公司
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