Method for preparing high-purity iron phosphate from iron-containing slag

A technology of high-purity phosphoric acid and iron phosphate, applied in chemical instruments and methods, crystal growth, recycling by waste collectors, etc., can solve problems such as environmental pollution and resource waste, and solve serious resource waste and environmental pollution problems and environmental impacts. Small size and low cost of raw materials

Active Publication Date: 2021-08-20
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention not only solves the problems of environmental pollution and resource waste caused by iron-containing slag, but also eases the environmental protection pressure of metallurgical enterprises and improves the economic benefits of smelting enterprises

Method used

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  • Method for preparing high-purity iron phosphate from iron-containing slag
  • Method for preparing high-purity iron phosphate from iron-containing slag
  • Method for preparing high-purity iron phosphate from iron-containing slag

Examples

Experimental program
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Effect test

Embodiment 1

[0053] according to figure 1 In the process flow diagram shown, 7 mol / L phosphoric acid is added to the sulfuric acid pressure leaching residue of laterite nickel ore containing 48.2% iron at a solid-to-liquid ratio of 1:6 g / mL, and the concentration of hydrogen peroxide is 0.1 mol / L. The selective leaching temperature is controlled at 85°C, the leaching time is 3h, and the stirring speed is set at 200rpm; solid-liquid separation, and the leaching slag can be sold as raw materials for preparing cement ceramics. Add 2 times the volume of water to the leaching solution for dilution, maintain the pH of the system at 0.5, and add 80g / L ferric phosphate as a seed crystal and CTAB with an iron content of 0.1% as a surfactant, the crystallization temperature is 80 ° C, and the time is 24h, the stirring speed is 100rpm; after the crystallization, solid-liquid separation, the crystallized product is dried in an oven at 80°C for 12h to obtain ferric phosphate dihydrate, see figure 2 ....

Embodiment 2

[0055] according to figure 1 In the process flow diagram shown, 5 mol / L phosphoric acid is added to red mud containing 25.0% iron at a solid-to-liquid ratio of 1:10 g / mL, the concentration of hydrogen peroxide is 0.5 mol / L, and the selective leaching temperature is controlled as 80°C, the leaching time is 4h, and the stirring speed is set at 500rpm; solid-liquid separation, and the leaching residue can be sold as raw materials for making cement ceramics. Add 5 times the volume of water to the leachate for dilution, maintain the pH of the system at 2.0, and add 50 g / L of ferric phosphate as a seed crystal and SDS with an iron content of 0.2% as a surfactant. The crystallization temperature is 85 ° C, and the time is After 18 hours, the stirring speed was 50 rpm; after the crystallization was completed, the solid and liquid were separated, and the crystallized product was dried in an oven at 80° C. for 12 hours to obtain ferric phosphate dihydrate. The remaining crystallization...

Embodiment 3

[0057] according to figure 1 In the process flow chart shown, 8mol / L phosphoric acid is added to the laterite nickel ore pyro-smelting slag containing 32.0% iron at a solid-to-liquid ratio of 1:8g / mL, and oxygen is passed through the system at a flow rate of 5ml / min, the selective leaching temperature is controlled at 70°C, the leaching time is 0.5h, and the stirring speed is set at 400rpm; solid-liquid separation, leaching slag can be sold as raw materials for making cement ceramics. Add 0.5 times the volume of water to the leachate for dilution, maintain the pH of the system at 0.2, and add 10 g / L of ferric phosphate as a seed crystal and SDBS with an iron content of 0.5% as a surfactant. The crystallization temperature is 90 ° C, and the time is 6h, the stirring speed is 300rpm; after the crystallization is completed, the solid and liquid are separated, and the crystallized product is dried in an oven at 80°C for 12h to obtain ferric phosphate dihydrate. 20% of the remain...

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Abstract

The invention discloses a method for preparing high-purity iron phosphate from iron-containing slag, and belongs to the technical field of comprehensive utilization of industrial solid wastes. The method comprises the steps that: high-concentration phosphoric acid selective leaching is conducted on the iron-containing slag, the concentration of phosphoric acid is 4-8 mol / L, solid-liquid separation is conducted after the reaction is finished, and leached slag can serve as a raw material for manufacturing cement ceramics to be sold; water is added into leachate to dilute the leachate, and then crystallization iscontrolled to prepare high-purity iron phosphate; and residual crystallization liquid is subjected to a membrane separation-evaporation concentration process to realize regeneration and cyclic utilization of the phosphoric acid. The method is short in process, low in cost, high in environmental friendliness and high in iron utilization rate; the prepared high-purity iron phosphate can be used for preparing materials such as lithium ion batteries, ceramics and catalysts; and macro element iron in iron-containing industrial solid waste is utilized in a high-valued mode. According to the method, the problems of environmental pollution and resource waste caused by the iron-containing slag are solved, the environmental protection pressure of metallurgical enterprises is relieved, and the economic benefits of the metallurgical enterprises are improved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of industrial solid waste, and in particular relates to a method for preparing high-purity ferric phosphate from iron-containing slag. Background technique [0002] With the continuous development of the metallurgical industry and the increase in social demand, the production capacity of non-ferrous metals such as nickel and aluminum continues to expand. In 2020, the global output of refined nickel will be 2.42 million tons, and the output of primary aluminum will be 65.27 million tons. Such a huge output is accompanied by the generation of a large amount of smelting slag. The generation of these industrial solid wastes not only creates a serious environmental protection burden for smelting enterprises, but also seriously threatens the safety of the ecological environment. Therefore, it is imminent to develop a comprehensive and efficient method for treating such industrial solid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B29/22H01M4/58H01M10/0525H01M10/54
CPCC30B7/14C30B29/22H01M10/54H01M10/0525H01M4/5825Y02W30/84Y02E60/10
Inventor 马保中王成彦曹志河陈永强张文娟
Owner UNIV OF SCI & TECH BEIJING
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