Method for preparing high-purity iron phosphate by utilizing pyrite cinder

A technology of pyrite slag and high-purity phosphoric acid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low purity of iron phosphate products, low conversion utilization rate of iron elements, etc., to improve the conversion rate. The effect of utilization, mild conditions and simple process

Active Publication Date: 2018-10-26
湖北丰锂新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current method of producing iron phosphate from pyrite slag is not mature, and there are disadvantages such as low conversion and utilization rate of iron element in pyrite slag and low purity of iron phosphate products

Method used

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  • Method for preparing high-purity iron phosphate by utilizing pyrite cinder
  • Method for preparing high-purity iron phosphate by utilizing pyrite cinder
  • Method for preparing high-purity iron phosphate by utilizing pyrite cinder

Examples

Experimental program
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Effect test

Embodiment 1

[0065] (1) Pyrite slag (components containing the following mass percentages: 43.31% of ferric oxide, 8.13% of ferric oxide, 1.63% of calcium oxide, 0.46% of magnesium oxide, 35.73% of silicon oxide and 0.16% of sulfur ) washed with water and then dried, then crushed with a high-speed pulverizer and crossed a 200-mesh sieve to obtain a particle size of 200 mesh pyrite slag powder, and then add it to the pyrite slag powder according to the solid-to-liquid ratio of 150g / L Add a sulfuric acid solution with a concentration of 50%, stir until evenly mixed, and form a mixture;

[0066] (2) transfer the mixed material into a hydrothermal reaction kettle, heat to 80° C. for hydrothermal reaction for 8 hours, then filter the reacted mixed material and collect the filtrate to obtain a reaction liquid;

[0067] (3) Add ammonia water to the reaction solution until the pH value is 1.5, then raise the temperature to 100° C., stir for 0.5 h and then transfer to the dialysis bag for purificat...

Embodiment 2

[0072] (1) Pyrite slag (components containing the following mass percentages: 43.31% of ferric oxide, 8.13% of ferric oxide, 1.63% of calcium oxide, 0.46% of magnesium oxide, 35.73% of silicon oxide and 0.16% of sulfur ) washed with water and dried, then crushed with a high-speed pulverizer and crossed a 100-mesh sieve to obtain a particle size of 100 mesh pyrite slag powder, and then add it to the pyrite slag powder according to the solid-to-liquid ratio of 100g / L Add a sulfuric acid solution with a concentration of 40%, stir until evenly mixed, and form a mixture;

[0073] (2) transfer the mixed material into a hydrothermal reaction kettle, heat to 120° C. for hydrothermal reaction for 6 hours, then filter the reacted mixed material and collect the filtrate to obtain a reaction liquid;

[0074] (3) Add ammonia water to the reaction solution until the pH value is 1.0, then raise the temperature to 80°C, stir for 1 hour and then transfer it to the dialysis bag for purification...

Embodiment 3

[0079] (1) Pyrite slag (components containing the following mass percentages: 43.31% of ferric oxide, 8.13% of ferric oxide, 1.63% of calcium oxide, 0.46% of magnesium oxide, 35.73% of silicon oxide and 0.16% of sulfur ) washed with water and dried, then crushed with a high-speed pulverizer and crossed a 500-mesh sieve to obtain a 500-mesh pyrite slag powder, which was then added to the pyrite slag powder according to the solid-to-liquid ratio of 250g / L Add a hydrochloric acid solution with a concentration of 37%, stir until evenly mixed, and form a mixture;

[0080] (2) transfer the mixed material into a hydrothermal reaction kettle, heat to 60° C. for hydrothermal reaction for 12 hours, then filter the reacted mixed material and collect the filtrate to obtain a reaction liquid;

[0081] (3) Add urea to the reaction solution until the pH value is 1.5, then raise the temperature to 100°C, stir for 0.5h, then transfer to the dialysis bag for purification for 18h, and place the ...

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Abstract

The invention discloses a method for preparing high-purity iron phosphate by utilizing pyrite cinder. The method comprises the following steps: cleaning and drying pyrite cinder, grinding to form pyrite cinder powder, and mixing with an acid solution to form a mixture; heating the mixture to a temperature of 60-120 DEG C, carrying out hydrothermal reaction for 6-12 hours, performing solid-liquid separation, and collecting the reaction solution; regulating the temperature of the reaction solution to 60-100 DEG C, regulating the pH value to 1.0-1.5, stirring and purifying to obtain ferric hydroxide colloid; dissolving the ferric hydroxide colloid into a phosphoric acid solution, heating to the temperature of 80-160 DEG C, carrying out hydrothermal reaction for 6-12 hours, performing solid-liquid separation, and collecting the solid product; and washing, drying and calcining the solid product, thereby obtaining the high-purity iron phosphate. The method for preparing high-purity iron phosphate by utilizing pyrite cinder provided by the invention is simple in process and mild in conditions, and the conversion utilization rate of the iron element in pyrite cinder and the product purityof the prepared iron phosphate are improved.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of pyrite slag in the sulfuric acid industry, in particular to a method for preparing high-purity ferric phosphate by utilizing pyrite slag. Background technique [0002] Pyrite slag is the residue discharged after pyrite roasting to extract sulfur. In addition to the utilization of sulfur in pyrite, iron and other elements remain in the slag. A large amount of pyrite slag is produced every year in our country due to the production of sulfuric acid from pyrite. If it is abandoned, it will not only take up a lot of stockpiles, but also cause serious pollution to water, air and soil. Therefore, it is of great significance to study the technology of turning pyrite slag from waste into treasure to improve resource utilization and reduce pollution. [0003] Iron phosphate (FePO 4 ) is a monoclinic crystal with a white or off-white powder appearance. It was originally widely used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37
CPCC01B25/375C01P2002/72C01P2004/03C01P2006/80
Inventor 费会秦振华潘海珍陶瑞东
Owner 湖北丰锂新能源科技有限公司
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