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A method for preparing iron phosphate by utilizing the by-product iron phosphorus produced by industrial yellow phosphorus

A by-product, iron phosphate technology, applied in phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve environmental hazards, low economic benefits, waste of phosphorus and iron resources, etc.

Active Publication Date: 2020-10-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most domestic phosphorus chemical production enterprises do not fully utilize the by-product ferrophosphorus, and some enterprises directly treat it as waste residue, which leads to low economic benefits in the utilization of phosphorus and ferrophosphorus resources in phosphorus chemical industry, and results in a disguised form. Extremely wasteful and harmful to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: a kind of method that utilizes the by-product ferrophosphorus produced by industrial yellow phosphorus to prepare ferric phosphate, and concrete steps are as follows:

[0021] (1) Prepare mixed solution A in the reactor (mixed solution A is a mixed aqueous solution of potassium chlorate and hydrochloric acid), and then add ferrophosphorus that is ground until all materials pass through a 200-mesh sieve. The leaching reaction was 6h under the condition of 300rpm, and the leachate B was obtained by separation; wherein the mass concentration of potassium chlorate in the mixed solution A was 40%, the mass concentration of hydrochloric acid was 6%, and the liquid-solid mass ratio of the mixed solution A to ferrophosphorus was 12:1 ;

[0022] (2) Under the conditions of normal pressure, room temperature, and a stirring speed of 300 rpm, add sulfide (sulfide is phosphorus pentasulfide) to the leachate B obtained in step (1) and react for 1.5 hours to separate and...

Embodiment 2

[0026] Embodiment 2: a kind of method that utilizes the by-product iron phosphorus that industrial yellow phosphorus produces to prepare iron phosphate, and concrete steps are as follows:

[0027] (1) Prepare mixed solution A in the reactor (mixed solution A is a mixed aqueous solution of potassium chlorate and hydrochloric acid), and then add ferrophosphorus that is ground until all materials pass through a 200-mesh sieve. Under the condition of 500rpm, the leaching reaction was 8h, and the leach solution B was separated; wherein the mass concentration of potassium chlorate in the mixed solution A was 30%, the mass concentration of hydrochloric acid was 3%, and the liquid-solid mass ratio of the mixed solution A to ferrophosphorus was 16:1 ;

[0028] (2) Under the conditions of normal pressure, room temperature and a stirring speed of 500rpm, add sulfide (sulfide is sodium sulfide) to the leachate B obtained in step (1) and react for 0.5h to obtain solid precipitate C and pur...

Embodiment 3

[0032] Embodiment 3: a kind of method that utilizes the by-product ferrophosphorus produced by industrial yellow phosphorus to prepare ferric phosphate, and concrete steps are as follows:

[0033] (1) Prepare mixed solution A in the reactor (mixed solution A is prepared from the mother liquor and water obtained by the separation of step (4) of Example 1), and then add ferrophosphorus that is ground until the material passes through a 200-mesh sieve. Under the conditions of normal pressure, temperature 80°C, and stirring speed 500rpm, the leaching reaction was carried out for 8 hours, and the leachate B was obtained by separation; the mass concentration of potassium chlorate in the mixed solution A was 35%, and the mass concentration of hydrochloric acid was 4%. The mixed solution A and phosphorus The liquid-solid mass ratio of iron is 14:1;

[0034](2) Under the conditions of normal pressure, room temperature and a stirring speed of 400rpm, add sulfide (sulfide is a saturated ...

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PUM

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Abstract

The invention discloses a method for preparing iron phosphate from phosphorus iron as a byproduct of industrial yellow phosphorus production, and belongs to the field of industrial byproduct utilization. The method comprises the following steps: oxidatively leaching the phosphorus iron by using an acidic solution of potassium chlorite to obtain an aqueous solution containing iron and phosphate, purifying the leached separated aqueous solution to remove impurity elements, adjusting the pH value by using an alkali solution till a neutral state, separating to obtain a solid precipitate, slurryingthe solid precipitate by using water, reversely adjusting the pH value to 1-2 by using a phosphoric acid solution, separating to obtain a solid precipitate, and washing, drying and calcining to obtain iron phosphate; performing evaporation concentration and cooling crystallization on the solution obtained through precipitate separation, and separating to obtain a sodium chloride product. by the method, technological equipment is simple and operation is easy and safe; an industrial waste is used for producing a chemical product with a high added value and a relatively wide application range, so that effective resource utilization is achieved and the purposes of circular economy, energy conservation and emission reduction can be achieved.

Description

technical field [0001] The invention relates to a method for preparing ferric phosphate by using ferrophosphorus, a by-product of industrial yellow phosphorus production, and belongs to the field of industrial by-product utilization. Background technique [0002] Ferrophosphorus is a by-product produced in the production process of industrial yellow phosphorus. For every 1 ton of yellow phosphorus produced in industry, 0.1-0.2 t of ferrophosphorus can be produced by-product. According to the current domestic industrial yellow phosphorus production estimate, the domestic yellow phosphorus industry produces phosphorus by-product every year. About 100,000 tons of iron. The main components of ferrophosphorus are phosphorus and iron, and contain a small amount of silicon, calcium, manganese and residual carbon, sulfur, etc., and the content of ferrophosphorus reaches 80-95%. [0003] At present, most domestic phosphorus chemical production enterprises do not fully utilize the by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/37
CPCC01B25/375
Inventor 苏毅陈富金任园园李国斌罗康碧李沪萍胡亮梅毅
Owner KUNMING UNIV OF SCI & TECH