Organic phase back-extraction method for preparing cerium terbium lanthanum phosphate

Abstract

The invention relates to an organic phase back-extraction method for preparing cerium terbium lanthanum phosphate, which comprises the following process steps: (1) using hydrochloric acid or nitric acid to dissolve lanthana, cerium oxide and terbia respectively to obtain first solution; (2) preparing organic extractant solution which consists of one or two extractants of 2-ethylhexyl phosphate 2-ethylhexyl ester, trioctyl tertiary amine, dioctylphosphoric acid ester, tributyl phosphate, Cyanex272 and naphthenic acid and sulfonated kerosene to obtain second solution; (3) adding the first solution and the second solution into a reactor to prepare third solution; (4) preparing solution containing phosphate groups to form rare-earth phosphate sediment; and (5) after the precipitation reactionis finished, washing products by water, performing centrifugal dehydration on the product, mixing the product and absolute ethanol into slurry, placing the slurry, carrying out drying treatment on the slurry and calcinating the dried slurry to obtain a cerium terbium lanthanum phosphate powder body. The cerium terbium lanthanum phosphate prepared by the method has low content of impurity, controllability of the granularity of particles, even distribution of the granularity of the particles and good crystal morphology.

Description

(1) Technical field [0001] The invention relates to a preparation method of rare earth phosphate, in particular to a preparation method of lanthanum cerium terbium phosphate, which belongs to the technical field of rare earth new materials in the field of inorganic materials. (2) Background technology [0002] Rare earth phosphate is a kind of fluorescent light-emitting material that is widely used, and the most representative one is lanthanum cerium terbium phosphate green phosphor, which is a kind of green phosphor widely used in rare earth three primary color fluorescent lamps and other purposes, and its molecular formula is ( LaCeTb)PO4, referred to as LAP. Compared with the conventional aluminate green powder (CAT), this material has the advantages of high luminous brightness, moderate synthesis temperature, and large color coordinate X value. It is a new generation of green phosphor products that replace CAT, and has become a rare earth One of the hotspots in the fiel...

AI Technical Summary

Problems solved by technology

The disadvantages of this process are: phosphorus oxide volatilization is easy to occur at high temperature, so that the ratio of rare earth elements and phosphate radicals in the product cannot be accurately controlled; the burning temperature is high, and the energy consumption is large; the synthetic product is mixed with impurities; the particle size of the product is partial Large and wide particle size distribution

Due to the sintering of the product during the calcination stage, the fine particles formed during precipitation are united into large particles, and the particle size and particle size distribution of the product cannot be effectively controlled.