Method for preparing FexPO4-containing substances from ferrophosphorus at low temperature

Abstract

The invention relates to a method for preparing FexPO4-containing substances from ferrophosphorus at a low temperature. The ferrophosphorus is mixed with oxidizing substances; then, low-temperature reaction is performed to obtain FexPO4-containing substances; phosphorus sources or iron sources are supplemented according to the ferrophosphorus composition; the influence of impurities in the ferrophosphorus on products is eliminated by physical or chemical measures; the reaction process is enhanced; the fully sealed harm-byproduct-free green and clean production can be realized through regulating and controlling raw materials and process parameters; the generated products can be subjected to concentration granulation or controlled crystallization; the granularity and the appearance are controllable. The method has the advantages that the cheap ferrophosphorus waste slag is converted into high-value FexPO4-containing substances at low temperature; the ferrophosphorus resources are not limited; the influence of impurity elements on products can be eliminated; the granulation treatment can also be performed on products; the appearance and the granularity are controlled; the obtained finished product has high purity and high value; the granularity and the appearance can be easily controlled; the water consumption is low; the energy consumption is low; the preparation method and the process are simple; the resource utilization rate is high; the cost is low; the investment is low; the benefits are good; cleanness and environment protection are realized.

Description

technical field [0001] The invention relates to a low-temperature preparation of Fe-containing x PO 4 The material method overcomes the influence of impurities in raw materials, and the product has high purity, fine particle size, easy control of shape, and simple process. It can be applied to the comprehensive utilization of chemical solid waste and the low-cost clean production of high-end phosphate materials. Background technique [0002] As a phosphate of iron, containing Fe x PO 4 There are many kinds of substances, common ones are ferric phosphate, ferrous phosphate, ferric hydroxyphosphate, ferrous hydroxyphosphate, ferric carbonate phosphate, ferrous carbonate phosphate, which are widely used in energy materials, catalysts, ceramics, food additives and other fields . In the field of energy materials, containing Fe x PO 4 The substance itself can be used not only as an electrode material, but also as a material for preparing LiFePO 4 , LiFeP 2 o 7 and Li 3 F...

AI Technical Summary

Problems solved by technology

In addition, when preparing ferric phosphate directly from ferrophosphorus, the particle size of the product is greatly affected by the particle size of the raw material of ferrophosphorus

[0005] Here, the present invention proposes to utilize ferrophosphorus to prepare Fe-containing x PO 4 A new process route to overcome the current Fe x PO 4 Insufficiency of the production process, using the magnetic properties of ferrophosphorus to physically purify it, solve the problem of preparing Fe from ferrophosphorus x PO 4 When the ferrophosphorus raw material consumes a lot of water, high energy consumption, and the type and content of impurities are uncertain, it is difficult to fully purify impurity elements and Fe x PO 4 To solve the technical problem of difficult control of product particle size and shape, simplify the preparation process, reduce energy consumption and waste discharge, the present invention proposes a new process method completely different from the above invention: reacting ferrophosphorus and oxidizing substances under low temperature conditions Preparation of Fe x PO 4 , Fe can be obtained directly through raw material selection and process control x PO 4 Finished products, which can be further used as raw materials for the production of other materials, and the types of by-products are controllable

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