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Method for circularly preparing iron oxyhydroxide from ferric trichloride

A technology of ferric oxyhydroxide and ferric chloride, which is applied in the direction of ferric oxide/ferric hydroxide, can solve the problems of high production cost, difficult wastewater treatment, high impurity content, etc., and achieve low cost, convenient operation and high purity Effect

Pending Publication Date: 2021-12-17
3R ENVIRONMENTAL TECH CO LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the disadvantages of high impurity content, high production cost and difficult wastewater treatment in the current iron oxyhydroxide preparation process, the present invention proposes a method for preparing iron oxyhydroxide using ferric chloride as a catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing ferric oxyhydroxide with iron trichloride circulation, comprising the following steps:

[0029] Take an aqueous solution of ferric chloride (FeCl 3 :37%) 1 kg, add 64.9 g of iron sheet (Fe: 98%), raise the temperature to 80°C, stir for 3 hours, and filter to obtain ferrous chloride solution. The ferrous chloride solution was added into the reaction kettle, the temperature was raised to 80° C., oxygen was introduced, the pressure inside the kettle was 0.1 MPa, and the reaction was stirred for 6 hours. The reaction feed liquid was cooled to 60° C. for suction filtration to obtain a filtrate and a filter residue, and the filter residue was washed and dried to obtain 101 g of iron oxyhydroxide. Filtrate is ferric chloride solution, returns to continue dissolving iron source.

Embodiment 2

[0031] A method for preparing ferric oxyhydroxide with iron trichloride circulation, comprising the following steps:

[0032] Take an aqueous solution of ferric chloride (FeCl 3 : 39%) 1 kg, add 67.76 g of ring iron (Fe: 99%), raise the temperature to 85°C, stir for 2 hours, and filter to obtain a ferrous chloride solution. The ferrous chloride solution was added to the reaction kettle, the temperature was raised to 83°C, 3g of concentrated nitric acid was added, oxygen was introduced, the pressure inside the kettle was 0.12MPa, and the reaction was stirred for 3h. The reaction feed liquid was cooled to 60° C. for suction filtration to obtain a filtrate and a filter residue. The filter residue was washed and dried to obtain 106.7 g of iron oxyhydroxide. The filtrate is ferric chloride solution, returns to continue to dissolve the iron source.

Embodiment 3

[0034] A method for preparing ferric oxyhydroxide with iron trichloride circulation, comprising the following steps:

[0035] Take an aqueous solution of ferric chloride (FeCl 3 : 28%) 1 kg, add 48.65g of iron nuggets (Fe: 99%), heat up to 83°C, stir for 3h, and filter to get the ferrous chloride solution. Add the ferrous chloride solution into the reaction kettle and heat up to 85°C ℃, add 2g of concentrated nitric acid, feed oxygen, control the pressure inside the kettle at 0.2MPa, and stir for 1h. The reaction feed liquid was cooled to 60° C. for suction filtration to obtain a filtrate and a filter residue. The filter residue was washed and dried to obtain 75.3 g of iron oxyhydroxide. The filtrate is ferric chloride solution, returns to continue to dissolve the iron source.

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Abstract

The invention belongs to the technical field of environmental protection, and provides a method for circularly preparing iron oxyhydroxide from ferric trichloride, wherein the method comprises the steps: using a ferric trichloride solution as a raw material, carrying out replacement reaction on the ferric trichloride solution and an iron source in a reaction tank, and filtering to obtain a high-purity ferrous solution; sequentially carrying out oxygen oxidation, filtration separation and filtration on the ferrous solution to obtain an iron salt solution, and further washing filter residues to obtain a washing solution and iron oxyhydroxide; and respectively sending the ferric salt solution and the washing solution back to the reaction tank, continuously reacting, and circularly dissolving the iron source. The whole process does not consume ferric trichloride, ferric oxyhydroxide is obtained by circularly dissolving the iron source through ferric trichloride and oxidizing with oxygen, the process route is simple and environment-friendly, and remarkable economic and social benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for preparing ferric oxyhydroxide by ferric chloride circulation. 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. [0003] In the prior art, the preparation of iron oxyhydroxide is mainly by Fe 2+ The metal salt solution and the alkali solution are mixed, the pH and temperature of the system are controlled, and then oxidized, filtered and dried to obtain the finished product of iron oxyhydroxide. Although the above method can produce and prepare ferric oxyhydroxide in large quantities and stably, the method adopts alkali solution as a raw material to adjust the pH of the solution, which has high impurity content, hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/02
CPCC01G49/02
Inventor 蓝立财宋德生江仲厅罗莉娟侯汝龙石肖梁茂杰丁德才肖晋宜
Owner 3R ENVIRONMENTAL TECH CO LTD
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