Method for preparing high-cerium nano-stage rare earth polishing powder from rare earth ore concentrate

Abstract

A method for preparing rare-earth polish powder in high cerium nanometer magnitude from rare earth ore concentrate, which is characterized in that the producing steps comprise directly preparing mixed carbonic acid rare-earth from rare earth ore concentrate dense sulphating roasting and infusion with a method of precipitating ammonium acid carbonate, mixing the mixed carbonic acid rare-earth and alkali 0.5-2 parts, heating to 600-800 DEG C to melt the compound, keeping the temperature for 1-4 hours in the molten state, cooling, grinding, then, adding industrial hydrofluoric acid HF>=45% whose adding amount is 10%-20% of the weight of rare-earth concentrate powder, and obtaining oxyfluoride rare earth enriched products, the oxyfluoride rare earth enriched products are grinded, watered, water filtered, mixed in a mixer, then packed into a high-energy ball mill with sieve, and filled with nitrogen, wet powder is ball-abraded with high energy, a high pressure current rotary passage is arranged on the lower portion of a rear sieve of a high-energy ball mill room, the water of sieved powder is dried under the impetus of high speed currents and then baked, and finished polish powder whose powder particle size is <=500nm is obtained.

Description

technical field [0001] The invention relates to a production method for preparing ceric nano-scale rare earth polishing powder by using rare earth concentrate. Background technique [0002] In military and defense engineering, many weapons and equipment require precision polishing. This kind of polishing mostly uses rare earth polishing powder. For the production of rare earth polishing powder, most manufacturers at home and abroad adopt the process of converting raw materials such as rare earth oxide and rare earth sulfate into intermediates such as rare earth hydroxide and rare earth carbonate, and then fluorinating them, and then roasting, grinding, and sorting to obtain finished product. The process for producing nanometer-sized polishing powders has complex processes, high cost, and low yield of finished powders, which is unfavorable for the wide application of rare earth polishing powders with nanometer-sized particles. There is also a production process of decompos...

AI Technical Summary

Problems solved by technology

This process produces nanoscale powder size polishing powder, the process is complicated, the cost is high, and the yield of finished powder is low, which is not conducive to the wide application of rare earth polishing powder with nanometer size powder.

There is also a production process that uses hot alkali solution to decompose rare earth concentrates to directly produce rare earth hydroxide intermediates. This process takes a long time to produce powders with a particle size of ≤1 μm, which is not conducive to large-scale production.