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Method and device for preparing cerium-based rare earth polishing powder by virtue of spray pyrolysis

A rare earth polishing powder and spray thermal decomposition technology is applied in the field of materials to achieve the effects of simplifying the complex structure of the equipment, avoiding the consumption of raw materials and reducing the cost

Active Publication Date: 2015-03-25
连云港高品再生资源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the above-mentioned problems existing in the existing cerium-based rare earth polishing powder preparation technology, the present invention provides a method and device for preparing cerium-based rare earth polishing powder by spray pyrolysis. By selecting rare earth chlorides and additives, controlling the roasting temperature and gas flow rate, the In the case of no pollution, the rare earth polishing powder with good performance and high purity can be made

Method used

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  • Method and device for preparing cerium-based rare earth polishing powder by virtue of spray pyrolysis
  • Method and device for preparing cerium-based rare earth polishing powder by virtue of spray pyrolysis
  • Method and device for preparing cerium-based rare earth polishing powder by virtue of spray pyrolysis

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Experimental program
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Effect test

Embodiment 1

[0055] The structure of the device used is as figure 1 As shown, it includes a roasting furnace 1 and a cyclone separation device. The outside of the roasting furnace 1 is covered with a heating and heat preservation device 2. The inlet at the bottom of the roasting furnace 1 is connected to the blowing pipe 16, and the blowing pipe 16 is communicated with the liquid inlet tank 13. The liquid inlet tank 13 is connected to the The outlet of the air compressor 12 is connected; the cyclone separation device is composed of a first-stage cyclone separator, a second-stage cyclone separator and a third-stage cyclone separator in series, and the inlet of the first-stage cyclone separator 3 is connected with the outlet of the roasting furnace 1, and the first-stage cyclone separator 3 is connected with the outlet of the roasting furnace 1. The air outlet of the cyclone separator 3 is connected with the inlet of the secondary cyclone separator 5, the air outlet of the secondary cyclone s...

Embodiment 2

[0066] Device structure is the same as embodiment 1;

[0067] Method is with embodiment 1, and difference is:

[0068] The concentration of cerium chloride in the solution is 10g / L, NH 4 The concentration of F is 5g / L;

[0069] The temperature of the roasting furnace is 1700°C, the roasting time is 1s, the air flow rate during the injection process is 8000L / h, and the flow rate of the solution is 120L / h;

[0070] Cerium-based rare earth polishing powder, containing CeO by weight percentage 2 97.13%, the rest is CeF 3 and impurities, the weight content of impurities is 0.03%; the scanning electron microscope image of cerium-based rare earth polishing powder is as follows Figure 4 As shown, the XRD pattern is as Figure 5 shown;

[0071] The grinding force test of the cerium-based rare earth polishing powder was carried out, and the continuous grinding time was up to 56 hours.

Embodiment 3

[0073] Device structure is the same as embodiment 1;

[0074] Method is with embodiment 1, and difference is:

[0075] The concentration of cerium chloride in the solution is 100g / L, NH 4 The concentration of F is 50 g / L;

[0076] The temperature of the roasting furnace is 800°C, the roasting time is 40s, the air flow rate during the injection process is 800L / h, and the flow rate of the solution is 20L / h;

[0077] Cerium-based rare earth polishing powder, containing CeO by weight percentage 2 82.78%, the rest is CeF 3 And impurity, the weight content of impurity 0.04%; The scanning electron microscope picture of cerium-based rare earth polishing powder is as Figure 6 As shown, the XRD pattern is as Figure 7 shown;

[0078] The cerium-based rare earth polishing powder was subjected to a grinding force test, and the continuous grinding time was up to 63 hours.

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Abstract

The invention relates to a method and a device for preparing cerium-based rare earth polishing powder by virtue of spray pyrolysis and belongs to the technical field of materials. The method comprises the following steps: (1) dissolving rare earth chloride and a fluorine-containing additive in water to prepare a solution; and (2) by adopting air as a carrier gas, spraying the solution into a calcining furnace for calcining and naturally cooling calcined slag generated by the calcining to obtain the cerium-based rare earth polishing powder. The device comprises the calcining furnace and a cyclone separation device, wherein the inlet formed in the bottom of the calcining furnace is connected with a blowing pipe which is communicated with a liquid inlet tank and the liquid inlet tank is communicated with the outlet of an air compressor; the cyclone separation device comprises at least two stages of cyclone separators which are connected in series, and the gas outlet of the last-stage cyclone separator is communicated with the inlet of a tail gas absorption tower. F element in the cerium-based rare earth polishing powder prepared by the method, which is disclosed by the invention, only exists in a form of CeF3 so that the preparation of the cerium-based rare earth polishing powder by direct decomposition of the mixed solution of rare earth chloride can be achieved and the raw material consumption caused by calcining ammonium bicarbonate or fluorosilicic acid precipitates is avoided.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method and a device for preparing cerium-based rare earth polishing powder by spray pyrolysis. Background technique [0002] Rare earth polishing powder is a new type of polishing material that appeared and was put into use at the end of World War II. Afterwards, various countries continued to increase research efforts. Up to now, rare earth polishing powder has completely replaced the traditional iron polishing powder (Fe 2 o 3 ), etc., are widely used in cold processing of glass surfaces, polishing of flat glass, cathode ray tubes, TV computer monitors, glass shells, spectacle lenses, optical glass, lenses, gemstones, crystals, decorations and other devices. [0003] Cerium-based rare earth polishing powder is based on CeO 2 Rare earth polishing powder as the base material, as a new polishing material, especially in the polishing of optical glass, has the adva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09G1/02C01F17/00C09K3/14
CPCC01F17/206C09G1/02
Inventor 吴文远王振峰边雪
Owner 连云港高品再生资源有限公司
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