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Method for preparing ferric salt and iron oxyhydroxide from pickling waste liquid

A technology of iron oxyhydroxide and pickling waste liquid, applied in the directions of iron oxide/iron hydroxide, iron halide, etc., can solve the problems of low reaction efficiency, slow precipitation speed and high cost of raw materials, and achieves simple process, fast reaction speed, The effect of low cost of raw materials

Pending Publication Date: 2021-12-31
3R ENVIRONMENTAL TECH CO LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned method can produce and prepare ferric oxyhydroxide stably in large quantities, the method adopts an alkali solution as a raw material to adjust the pH of the solution, introduces salt impurities, and the raw material cost is high; Fe 2+ The precipitation is slow, takes a long time, and the reaction efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing iron salts and iron oxyhydroxides from pickling waste liquor, comprising the following steps:

[0021] 1000g of hydrochloric acid pickling waste (Fe: 8.68%, Fe 2+ : 8.44%, HCl: 4.73%) put in an appropriate amount of reduced iron powder, after the reaction, after filtration, 1074g ferrous chloride solution (Fe: 14.96%, Fe 2+ : 14.96%, HCl: 0.01%), placed in the oxidation reactor, adjust the stirring speed to 100r / min, the reaction temperature is 90 ℃, no catalyst is added, oxygen is introduced, the pressure of the reactor is kept at 0.15 MPa, and the reaction time is 4h , After the reaction, filter to obtain 927g of ferric chloride and 85g of ferric oxyhydroxide (dry basis).

Embodiment 2

[0023] A method for preparing iron salts and iron oxyhydroxides from pickling waste liquor, comprising the following steps:

[0024] 1000g of hydrochloric acid pickling waste (Fe: 9.30%, Fe 2+ : 8.90%, HCl: 2.37%) put in an appropriate amount of iron sheet, after the reaction, after filtration, 1039g ferrous chloride solution (Fe: 12.72%, Fe 2+ : 12.72%, HCl: 0.01%), put it in the oxidation reaction kettle, adjust the stirring speed to 500r / min, the reaction temperature is 75℃, add 0.5g of catalyst nitric acid, feed oxygen, keep the pressure of the reaction kettle at 0.3 MPa, and react After 3 hours of reaction, filter to obtain 918g of ferric chloride and 70g of ferric oxyhydroxide (dry basis).

Embodiment 3

[0026] A method for preparing iron salts and iron oxyhydroxides from pickling waste liquor, comprising the following steps:

[0027] Put 1000g of hydrochloric acid pickling waste liquid (Fe: 12.35%, Fe2+: 11.55%, HCl: 3.17%) into an appropriate amount of ring iron. After the reaction is completed, filter to obtain 1040g of ferrous chloride solution (Fe: 16.38%, Fe 2+ : 16.38%, HCl: 0.01%) were placed in the oxidation reactor, the stirring speed was adjusted to 600r / min, the reaction temperature was 70°C, and oxygen was introduced to keep the reactor pressure at 0.10MPa, and the reaction time was 5h. After the reaction, Filter to obtain 973.2g of ferric chloride and 90.3g of ferric oxyhydroxide (dry basis).

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Abstract

The invention belongs to the technical field of environmental protection, and provides a method for preparing ferric salt and iron oxyhydroxide from pickling waste liquid, wherein the method comprises the following steps: carrying out replacement reaction on the pickling waste liquid as a raw material and a material containing elemental iron, and filtering to obtain a high-purity ferrous solution; and then sequentially carrying out oxygen oxidation and filtering separation on the ferrous solution, and thus obtaining an iron salt product and iron oxyhydroxide. According to the method, the pickling waste liquid is adopted as the raw material to prepare ferric salt and iron oxyhydroxide, so that hazardous wastes are recycled, and the effects of treating wastes with wastes and turning wastes into wealth are achieved; and the method has the characteristics of simple process, convenience in operation and low cost, and industrial application is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for preparing iron salt and iron oxyhydroxide from pickling waste liquid. Background technique [0002] Iron oxyhydroxide is an important industrial material, which has a wide range of uses in magnetic materials, catalysis, pigments, ceramics, rubber, biomedicine, heavy metal removal, sewage treatment, etc., and has excellent application prospects. Iron and steel pickling waste liquid is produced in the iron and steel processing industry, using hydrochloric acid solution to clean the oxides on the surface of iron and steel parts. Improper treatment of pickling waste liquid not only seriously pollutes the ecological environment, but also causes a great waste of resources. [0003] Therefore, it is of great practical significance to develop a process for producing iron salts and iron oxyhydroxides from pickling waste liquor. This process not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/10C01G49/02
CPCC01G49/10C01G49/02
Inventor 宋德生吴勇基侯汝龙蓝立财江仲厅丁德才肖晋宜
Owner 3R ENVIRONMENTAL TECH CO LTD