Modified iron phosphate, method for preparing modified iron phosphate from steel pickling waste liquid, and application

A technology for pickling waste liquid and iron phosphate, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc. Effect

Active Publication Date: 2021-01-01
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direct discharge of such waste liquid not only seriously pollutes the environment, but also causes great waste
In order to avoid the acid pollution of the pickling solution, the traditional method generally uses lime, calcium carbide slag or the product of lime digestion reaction Ca(OH) 2 After neutralization, although the pH value can meet the requirements, it is difficult for other indicators to meet the standards, and the generated sludge is difficult to dehydrate, difficult to dry, and difficult to post-process. land, causing secondary pollution, while the method wastes a large amount of acid and iron resources

Method used

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  • Modified iron phosphate, method for preparing modified iron phosphate from steel pickling waste liquid, and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing modified ferric phosphate from steel pickling waste liquor, comprising the steps of:

[0025] S1. Transfer the pickling waste liquid of steel into the treatment tank with double-layer grille for filtration to obtain filtrate A, pass the filtrate A into the oxidation tank, add titanium dioxide, and irradiate with sunlight for 1.5h to remove Fe 2+ fully oxidized to Fe 3+ , then add phosphoric acid, then add urea to adjust pH = 2.7, react at 50°C for 2h, filter to obtain filtrate B and filter cake (that is, crude iron phosphate), wherein, titanium dioxide and Fe in filtrate A 2+ The molar ratio of phosphoric acid and Fe in filtrate A is 1:18 2+ The molar ratio is 1:1;

[0026] S2. Concentrate and recover the filtrate B to obtain hydrochloric acid, then dissolve the crude ferric phosphate in hydrochloric acid, add urea to adjust pH=3.0, react at 65°C for 1 hour, filter to take the filter cake, and dry at 100°C to obtain ferric phosphate.

Embodiment 2

[0028] A method for preparing modified ferric phosphate from steel pickling waste liquor, comprising the steps of:

[0029] S1. Transfer the pickling waste liquid of steel into a treatment tank with a double-layer grid for filtration to obtain filtrate A, pass the filtrate A into the oxidation tank, add titanium dioxide, and irradiate with sunlight for 2 hours to remove Fe 2+ fully oxidized to Fe 3+ , then add phosphoric acid, then add urea to adjust pH = 3.0, react at 60°C for 2.5h, filter to obtain filtrate B and filter cake (that is, crude iron phosphate), wherein, titanium dioxide and Fe in filtrate A 2+ The molar ratio of phosphoric acid and Fe in filtrate A is 1:25 2+ The molar ratio is 1.05:1;

[0030] S2. Concentrate and recover the filtrate B to obtain hydrochloric acid, then dissolve the crude ferric phosphate in hydrochloric acid, add urea to adjust pH=4.0, react at 75°C for 2 hours, filter to take the filter cake, and dry at 110°C to obtain ferric phosphate.

Embodiment 3

[0032] A method for preparing modified ferric phosphate from steel pickling waste liquor, comprising the steps of:

[0033] S1. Transfer the pickling waste liquid of steel into the treatment tank with double-layer grille for filtration to obtain filtrate A, pass the filtrate A into the oxidation tank, add titanium dioxide, and irradiate with sunlight for 3 hours to remove Fe 2+ fully oxidized to Fe 3+ , then add phosphoric acid, then add urea to adjust pH = 3.8, react at 70°C for 3.5h, filter to obtain filtrate B and filter cake (that is, crude iron phosphate), wherein, titanium dioxide and Fe in filtrate A 2+ The molar ratio of phosphoric acid and Fe in filtrate A is 1:30 2+ The molar ratio is 1.07:1;

[0034] S2. Concentrate and recover the filtrate B to obtain hydrochloric acid, then dissolve the crude ferric phosphate in hydrochloric acid, add urea to adjust pH=5.0, react at 80°C for 2.5h, filter to take the filter cake, and dry at 120°C to obtain ferric phosphate.

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Abstract

The invention discloses a method for preparing modified iron phosphate from steel pickling waste liquid. The method comprises the following steps: S1, filtering the steel pickling waste liquid to obtain a filtrate A; adding titanium dioxide into the filtrate A, carrying out illumination oxidation, then adding phosphoric acid, adjusting the pH value to 2.7-3.8, and carrying out reaction and filtration to obtain a filtrate B and a filter cake which is a crude iron phosphate product; and S2, concentrating and recycling the filtrate B to obtain hydrochloric acid, then dissolving the iron phosphatecrude product in the hydrochloric acid, adjusting the pH value to 3.0-5.0, carrying out a reaction, filtering to obtain a filter cake, and drying the filter cake to obtain the iron phosphate. The invention further discloses modified iron phosphate which is prepared according to the method for preparing the modified iron phosphate from the steel pickling waste liquid. The invention also disclosesan application of the modified iron phosphate. According to the method, titanium dioxide modified iron phosphate is introduced while the steel pickling waste liquid is recycled, so that the lithium iron phosphate prepared in the later period exerts excellent cycle capacity performance, and cost reduction and benefit increase are realized.

Description

technical field [0001] The invention relates to the technical field of ferric phosphate preparation, in particular to a method and application of modified ferric phosphate and a method for preparing modified ferric phosphate from steel pickling waste liquid. Background technique [0002] The pickling waste liquid produced by hot rolling of steel generally contains H + and Fe 2+ , has been included in the "National List of Hazardous Wastes" due to its severe corrosiveness. The direct discharge of such waste liquid not only seriously pollutes the environment, but also causes great waste. In order to avoid the acid pollution of the pickling solution, the traditional method generally uses lime, calcium carbide slag or the product of lime digestion reaction Ca(OH) 2 After neutralization, although the pH value can meet the requirements, the remaining indicators are difficult to meet the standards, and the generated sludge is difficult to dehydrate, difficult to dry, and difficu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37C01B25/45
CPCC01B25/375C01B25/45C01P2006/40Y02E60/10
Inventor 陈霞刘兴亮汪伟伟杨茂萍
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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