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Processing method of waste iron phosphate

A treatment method, iron phosphate technology, applied in ammonium orthophosphate fertilizers, chemical instruments and methods, alkaline orthophosphate fertilizers, etc., can solve problems such as phosphorus pollution, achieve good processing performance, realize resource utilization, and increase specific surface area big effect

Inactive Publication Date: 2019-12-03
王敏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the production process of iron phosphate, there will be certain waste products, and the general waste rate reaches 2-5%. If this part of waste is not treated, the phosphorus in it will cause certain pollution

Method used

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  • Processing method of waste iron phosphate
  • Processing method of waste iron phosphate
  • Processing method of waste iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Get the waste ferric phosphate of certain factory, detect its each index, the result is as follows:

[0032]

[0033]

[0034] Add waste iron phosphate to phosphoric acid solution, heat up to 65°C after slurrying, react for 3 hours, and stir at a speed of 150r / min, then filter to obtain the first filtrate and first filter residue, waste iron phosphate and phosphoric acid in phosphoric acid solution The molar ratio is 1:1.08, and the concentration of phosphoric acid solution is 2.25mol / L.

[0035] The detection data of the first filtrate that obtains is as follows:

[0036] index pH Fe P Cd Ca value 1.01 116.32g / L 131.09g / L 25.8ppm 126ppm Mg Ni Cr Zn Cu co 3689ppm 197.5ppm 9.3ppm 87.4ppm 14.5ppm 18.7ppm

[0037] Add ammonium sulfide to the first filtrate obtained, react at a temperature of 50°C for 1.5h, and stir at a speed of 300r / min, then filter to obtain the second filtrate and the second filter...

Embodiment 2

[0051] Add waste ferric phosphate to phosphoric acid solution, heat up to 65°C after slurrying, react for 4 hours, and stir at a speed of 160r / min, then filter to obtain the first filtrate and the first filter residue, add ammonium sulfide to the obtained first filtrate, The temperature is 52°C for 1.5h, the stirring speed is 250r / min, and then filtered to obtain the second filtrate and the second filter residue, the second filtrate is mixed with urea, and the temperature is 99°C and the stirring speed is 150r / min. The pH is 1.95, and then filtered to obtain a third filter residue and a third filtrate, and the third filter residue is dried and then calcined to obtain battery-grade anhydrous iron phosphate.

[0052] The waste ferric phosphate is crushed after drying before phosphoric acid is dissolved, passed through an 80-mesh sieve, and the obtained under-sieve is subjected to electromagnetic iron removal to obtain a material with a magnetic substance ≤ 1 ppm. The magnetic sub...

Embodiment 3

[0062] Add waste ferric phosphate to phosphoric acid solution, heat up to 65°C after slurrying, react for 4 hours, and stir at a speed of 180r / min, then filter to obtain the first filtrate and the first filter residue, add ammonium sulfide to the obtained first filtrate, The temperature is 48°C for 1.5h, the stirring speed is 300r / min, and then filtered to obtain the second filtrate and the second filter residue, the second filtrate is mixed with urea, and the temperature is 98°C, and the stirring speed is 150r / min. The pH is 2.05, and then filtered to obtain a third filter residue and a third filtrate, and the third filter residue is dried and then calcined to obtain battery-grade anhydrous iron phosphate.

[0063] The waste ferric phosphate is crushed after being dried before phosphoric acid is dissolved, passed through a 100-mesh sieve, and the obtained under-sieve is subjected to electromagnetic iron removal to obtain a material with a magnetic substance ≤ 1 ppm. The magnet...

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Abstract

The invention discloses a processing method of waste iron phosphate, and belongs to the technical field of waste processing. The method comprises the following steps: adding the waste iron phosphate into a phosphoric acid solution, heating the phosphoric acid solution to react after slurrying is finished, and filtering the phosphoric acid solution to obtain a first filtrate and a first filter residue; adding ammonium sulfide into the obtained first filtrate, and carrying out stirring and reacting; then carrying out filtering to obtain a second filtrate and a second filter residue; mixing the second filtrate with urea, and carrying out reacting until the end point pH is 1.9-2.1, wherein the stirring speed is 100-200 r / min, and the temperature is 95-100 DEG C; carrying out filtering to obtain a third filter residue and a third filtrate; and drying and calcining the third filter residue to obtain battery-grade anhydrous iron phosphate. According to the processing method of the waste ironphosphate, resource utilization of the waste iron phosphate can be realized, high-end circulation is realized, the battery-grade anhydrous iron phosphate is obtained, the additional value of the battery-grade anhydrous iron phosphate is increased, resource utilization of byproducts is realized, and the obtained battery-grade anhydrous iron phosphate is large in specific surface area and good in processing performance.

Description

technical field [0001] The invention relates to a treatment method for waste iron phosphate, which belongs to the technical field of waste treatment. Background technique [0002] Recently, the Ministry of Industry and Information Technology released the fourth batch of "Catalogue of Recommended Models for the Promotion and Application of New Energy Vehicles" in 2019. A total of 238 models were on the list, among which the models supporting lithium iron phosphate came from JAC , BAIC New Energy, Zotye Automobile , Chery Commercial Vehicles, Chufeng Automobile, FAW Jiefang, Shandong Yixing Automobile Enterprises. As the new energy vehicle subsidy is approaching, the return of lithium iron phosphate is more obvious. The recommended catalog of new energy vehicles issued by the Ministry of Industry and Information Technology also confirms this point. Since 2019, the Ministry of Industry and Information Technology has released four batches of recommended catalogs. Since the f...

Claims

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Application Information

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IPC IPC(8): C01B25/37C05B7/00C01B25/45
CPCC01B25/375C01B25/45C01P2006/12C05B7/00
Inventor 王敏
Owner 王敏
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