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

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...

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