Method for preparing LixFeyPzO4 from ferrophosphorous

Abstract

The invention relates to a method for preparing LixFeyPzO4 from ferrophosphorous at a low temperature in a closed system. A raw material is purified through physical and chemical reaction processes, oxygen in an oxidation raw material provides an oxygen source for the above product, and the self material balance reaction and the self-produced pressure driving reaction of reactants are realized through raw material selection and technology regulation to solve the disadvantages of traditional ferrophosphorous high temperature reactions, the reaction temperature is low, the energy consumption and the water consumption are low, device corrosion is light, byproducts can only be water, and energy saving , emission reduction and clean production are realized. The method utilizes a convenient operating technology, and promotes the reaction by using the pressure generated in the reaction process, so the product has the advantages of high purity, small granularity, easy morphology control and easy reaction control, and the preparation method has the advantages of simplicity, high resource utilization rate, low cost, less investment, good benefit, cleanness and environmental protection, easy industrialization, and suitableness for high-value comprehensive utilization of chemical engineering byproducts and large-scale industrial low-cost clean production of high-end phosphates.

Description

technical field [0001] The invention relates to a low-cost preparation of Li by ferrophosphorus x Fe y P z o 4 The method overcomes the influence of impurities in raw materials, reduces water consumption and energy consumption, 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 high-end phosphate energy materials with special shapes. low-cost production. Background technique [0002] As an alloy formed of phosphorus and iron, ferrophosphorus has a slight metallic luster, a large proportion, rich resources, and a wide range of sources (such as: minerals or their smelting products, yellow phosphorus or calcium magnesium phosphate fertilizers, etc. produced by phosphorus chemical industry and silicate chemical industry. By-products, self-made, etc.), the output is relatively large (only in the process of producing phosphorus by the electric furnace met...

AI Technical Summary

Problems solved by technology

Currently commercial Li x Fe y P z o 4 The outstanding problems that still exist in the preparation process are: the use of expensive (sub) iron salts, the high energy consumption of high-temperature roasting, the difficulty of uniform mixing of solid precursors, etc., the strict limitation on the amount of oxygen, and the lack of utilization of oxygen-containing substances. Oxygen provides an oxygen source for the product, and the cost of raw materials and preparation is relatively high

In the invention patent 201010126920.X, although the one-step method is used to prepare LiFePO from phosphorus iron 4 , but using solid phase reaction, the reaction temperature is higher

[0005] In order to overcome the current Li x Fe y P z o 4 The deficiencies in the production process solve the problem of preparing Li by ferrophosphorus x Fe y P z o 4 Uncertain impurity types and contents in ferrophosphorus raw materials lead to difficulty in comprehensive purification of impurity elements, high water consumption and energy consumption, Li x Fe y P z o 4 The technical problems of large particle size and uncontrollable shape of the product, simplify the preparation process, reduce water consumption and energy consumption, and reduce waste discharge. In this application, based on our original patent application and new experimental results, we use physical methods and chemical reactions The process purifies ferrophosphorus through simple flotation and filtration, and can granulate the product and its precursor. It creatively proposes a coupling physical purification and chemical process to reduce the impact of the content of impurity elements in ferrophosphorus on the product and reduce the impact of low temperature on the product. Preparation of Li x Fe y P z o 4 new technology

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