Method for producing granular rare earth chloride

Abstract

The invention discloses a method for producing granular rare earth chloride, and belongs to the field of production of rare earth products, and the method mainly comprises the steps such as adjustingof the pH value of a rare earth chloride solution, concentrating and cooling crystallization of the rare earth chloride solution under reduced pressure. The high temperature rare earth chloride solution is crystallized in a cooling crystallizer which has the function of cooling and destroying solidification and growth of the crystal. The cooling crystallizer comprises a heat transfer jacket, a liner, a rotating shaft, a scraping stirring paddle, a bracket, a tiltable power device, a stirring power device, and the like, and the cooling crystallizer rapidly cools the rare earth chloride throughthe heat transfer jacket and jet air. The coagulation of crystal particles is destroyed by the stirring action of the scraping stirring paddle. The method solves the following problems in the production process in prior art: the rare earth chloride which is condensed as a whole must be crushed; in the cooling crystallization process the rare earth chloride is exposed to the outside air for a longtime, the product is easily contaminated; the production cycle is long; the crushed rare earth chloride has irregular sharp corners, and is not conducive to long-term preservation. The continuous production of the granular rare earth chloride is realized.

Description

Technical field [0001] The invention relates to a method for producing solid rare earth chloride by concentrated crystallization of rare earth chloride in a rare earth smelting and separation process, and belongs to the field of rare earth product production. Background technique [0002] Rare earth chloride is widely used in industry, especially in the petroleum catalytic cracking catalyst industry. A large amount of rare earth chloride is required. Rare earth chloride is extremely hygroscopic at room temperature and is easy to deliquesce. The processes of reduced pressure concentration, natural cooling and crystallization, and artificial crushing have been used in industrial production. There are problems in backward production processes, low labor productivity, and products that are easily contaminated. [0003] One link in the current industrial production of rare earth chloride is concentration, cooling and crystallization, that is, the mixed rare earth chloride solution after...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a production method of granular rare earth chloride, which solves the problem that the whole piece of rare earth chloride needs to be broken in the current production process, the production cycle is long, and the broken rare earth chloride has irregular sharp edges and corners, which are easy to scratch the packaging bag The inner lining material bag is not conducive to long-term storage and transportation and other issues

Images