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Method and application of modified iron phosphate and steel pickling waste liquid for preparing modified iron phosphate

A technology of pickling waste liquid and iron phosphate, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of difficult to meet the standards of various indicators, waste, and difficult post-processing, etc., and achieve excellent capacity performance Effect

Active Publication Date: 2022-08-09
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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  • Method and application of modified iron phosphate and steel pickling waste liquid for preparing modified iron phosphate

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Effect test

Embodiment 1

[0024] A method for preparing modified iron phosphate from steel pickling waste liquid, comprising the following steps:

[0025] S1. Transfer the pickling waste liquid of the steel into a treatment tank with a double-layer grid for filtration to obtain a filtrate A, pass the filtrate A into the oxidation tank, add titanium dioxide, and irradiate the Fe for 1.5 hours with sunlight. 2+ Completely 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 1:18, phosphoric acid and Fe in filtrate A 2+ The molar ratio is 1:1;

[0026] S2. The filtrate B is concentrated and recovered to obtain hydrochloric acid, then the crude ferric phosphate is dissolved in hydrochloric acid, urea is added to adjust pH=3.0, the reaction is carried out at 65° C. for 1 h, the filter cake is collected by filtration,...

Embodiment 2

[0028] A method for preparing modified iron phosphate from steel pickling waste liquid, comprising the following steps:

[0029] S1. Transfer the pickling waste liquid of the steel into a treatment tank with a double-layer grid for filtration to obtain a filtrate A, pass the filtrate A into the oxidation tank, add titanium dioxide, and irradiate the Fe for 2 hours with sunlight. 2+ Completely 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 1:25, phosphoric acid and Fe in filtrate A 2+ The molar ratio is 1.05:1;

[0030] S2. The filtrate B is concentrated and recovered to obtain hydrochloric acid, then the crude ferric phosphate is dissolved in hydrochloric acid, urea is added to adjust pH=4.0, the reaction is carried out at 75° C. for 2 h, the filter cake is collected by filtr...

Embodiment 3

[0032] A method for preparing modified iron phosphate from steel pickling waste liquid, comprising the following steps:

[0033] S1. Transfer the pickling waste liquid of the 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 the Fe for 3 hours with sunlight. 2+ Completely 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 1:30, phosphoric acid and Fe in filtrate A 2+ The molar ratio of 1.07:1;

[0034] S2. The filtrate B is concentrated and recovered to obtain hydrochloric acid, then the crude iron phosphate is dissolved in hydrochloric acid, urea is added to adjust pH=5.0, the reaction is carried out at 80°C for 2.5h, the filter cake is collected by filtration, a...

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Abstract

The invention discloses a method for preparing modified iron phosphate from steel pickling waste liquid, which comprises the following steps: S1. Filtration A is obtained by filtering the steel pickling waste liquid; titanium dioxide is added to the filtrate A for photo-oxidation, and then adding Phosphoric acid, adjust pH=2.7-3.8, carry out reaction filtration to obtain filtrate B and filter cake, filter cake is ferric phosphate crude product; S2, filtrate B is concentrated and recovered to obtain hydrochloric acid, then ferric phosphate crude product is dissolved in hydrochloric acid, and pH= 3.0-5.0, react, filter cake to obtain, and dry to obtain iron phosphate. The invention also discloses a modified iron phosphate, which is prepared according to the method for preparing the modified iron phosphate from the above-mentioned steel pickling waste liquid. The invention also discloses the application of the above-mentioned modified iron phosphate. The invention not only completes the recovery and utilization of the steel pickling waste liquid, but also introduces titanium dioxide-modified iron phosphate, so that the lithium iron phosphate obtained in the later stage exhibits excellent cycle capacity performance and realizes cost reduction and efficiency improvement.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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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