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...

Examples

Embodiment 1

[0021] Rare earth concentrate powder and ammonium bicarbonate, then add molten concentrated sulfuric acid, burn at 650°C, the amount of concentrated sulfuric acid added is 30% of the weight of rare earth concentrate powder, and keep stirring to make it fully react. Prepare mixed rare earth carbonate directly; mix rare earth carbonate with 1 part of alkali, heat to 800°C, melt the mixture, keep it in the molten state for 3 hours, cool, crush, and then add 45% industrial hydrofluoric acid, the amount of It is 20% of the weight of rare earth concentrate powder to obtain fluoride oxidized rare earth enrichment, fluoride oxidization rare earth enrichment, pulverize, wash with water, filter water, mix evenly in a mixer, and then put it into a high-energy ball mill with a sieve, and fill it with 1MPa Nitrogen for wet powder high-energy ball milling; there is a high-pressure airflow rotating channel under the rear sieve of the high-energy ball milling chamber, and the powder under the ...

Embodiment 2

[0023] Rare earth concentrate powder and ammonium bicarbonate, then add molten concentrated sulfuric acid, burn at a temperature of 800 ° C, the amount of concentrated sulfuric acid added is 20% of the weight of rare earth concentrate powder, and keep stirring to make it fully react. Prepare mixed rare earth carbonate directly; mix rare earth carbonate with 2 parts of alkali, heat to 700°C, melt the mixture, keep it in the molten state for 2 hours, cool, crush, and then add 45% industrial hydrofluoric acid, the amount It is 15% of the weight of rare earth concentrate powder to obtain fluoride oxidized rare earth concentrate, fluoride oxide dilute concentrate, pulverized, washed with water, filtered, mixed evenly in a mixer, and then loaded into a high-energy ball mill with a sieve, filled with 1.5 MPa nitrogen for wet powder high-energy ball milling; there is a high-pressure airflow rotating channel under the rear sieve of the high-energy ball milling chamber, and the powder un...

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...

Examples

Embodiment 1

[0021] Rare earth concentrate powder and ammonium bicarbonate, then add molten concentrated sulfuric acid, burn at 650°C, the amount of concentrated sulfuric acid added is 30% of the weight of rare earth concentrate powder, and keep stirring to make it fully react. Prepare mixed rare earth carbonate directly; mix rare earth carbonate with 1 part of alkali, heat to 800°C, melt the mixture, keep it in the molten state for 3 hours, cool, crush, and then add 45% industrial hydrofluoric acid, the amount of It is 20% of the weight of rare earth concentrate powder to obtain fluoride oxidized rare earth enrichment, fluoride oxidization rare earth enrichment, pulverize, wash with water, filter water, mix evenly in a mixer, and then put it into a high-energy ball mill with a sieve, and fill it with 1MPa Nitrogen for wet powder high-energy ball milling; there is a high-pressure airflow rotating channel under the rear sieve of the high-energy ball milling chamber, and the powder under the ...

Embodiment 2

[0023] Rare earth concentrate powder and ammonium bicarbonate, then add molten concentrated sulfuric acid, burn at a temperature of 800 ° C, the amount of concentrated sulfuric acid added is 20% of the weight of rare earth concentrate powder, and keep stirring to make it fully react. Prepare mixed rare earth carbonate directly; mix rare earth carbonate with 2 parts of alkali, heat to 700°C, melt the mixture, keep it in the molten state for 2 hours, cool, crush, and then add 45% industrial hydrofluoric acid, the amount It is 15% of the weight of rare earth concentrate powder to obtain fluoride oxidized rare earth concentrate, fluoride oxide dilute concentrate, pulverized, washed with water, filtered, mixed evenly in a mixer, and then loaded into a high-energy ball mill with a sieve, filled with 1.5 MPa nitrogen for wet powder high-energy ball milling; there is a high-pressure airflow rotating channel under the rear sieve of the high-energy ball milling chamber, and the powder un...