Process for preparing rare earth phosphate

Abstract

A preparation method for rare earth phosphate comprises stirring raw materials at a ammonium hydrogen phosphate/rare earth ion ratio of 1.0-4.0, adding rare earth inorganic solution (containing rare earth oxide 5 g/L-300 g/L) and 0.1 mol/L-2 mol/L phospahte into 0.01 mol/L-2 mol/L phosphoric acid respectively and controlling the concentration of phosphoric acid to obtain rare earth phosphate with uniform particle size which would increase with increasing of phosphoric acid concentration, aging, filtering the obtained rare earth phosphate, washing and drying, and torrefying at 200-1300DEG C for 1-15 h. This invention can prepare rare earth phosphate with good dispersity and no need for pulverization, and can accurately control the granularity of products in a certain range.

Description

technical field [0001] The invention relates to a preparation method of rare earth phosphate, in particular to a preparation method of rare earth phosphate which can simply control the particle size of the product in the process. Background technique [0002] Rare earth phosphates with the general formula REPO 4 , is an additive widely used in industrial production. For example, rare earth phosphate can be directly used as a catalyst for halogenated aromatic hydrocarbon gas-phase water-mediated phenol, or as a new type of high-efficiency curing agent for architectural coatings, especially for inorganic compounding of water glass The effect is excellent in a series of architectural coatings, lanthanum phosphate particles can be used in lithium-based grease, which can greatly improve its lubricating ability; cerium phosphate can be used as an effective additive to improve the processing performance of oxide ceramics, and has a wide range of applications in the electronics indu...

AI Technical Summary

Problems solved by technology

[0003] Usually, rare earth phosphates are manufactured by high-temperature solid-phase synthesis process, which is characterized in that the corresponding rare earth oxide and diammonium hydrogen phosphate are used as raw materials and synthesized at a high temperature above 1000 ° C. The defect of this process is that: at high temperature It is easy to produce phosphorus oxide to evaporate, so that the ratio of rare earth elements and phosphate in the product cannot be accurately controlled; the burning temperature is high, and the energy consumption is large; the synthetic product is mixed with heterogeneous phases and the particle size is too large

[0007] The disadvantage of the above method is that it needs a long time high temperature aging process, the process is complicated, and it is impossible to conveniently and accurately control the particle size of the product according to the needs.

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