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A method and device for preparing cerium-based rare earth polishing powder by spray pyrolysis

A technology of rare earth polishing powder and spray pyrolysis, applied in the field of materials, to simplify the complex structure of equipment, avoid raw material consumption, and reduce costs

Active Publication Date: 2016-07-27
连云港高品再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A method and device for preparing cerium-based rare earth polishing powder by spray pyrolysis
  • A method and device for preparing cerium-based rare earth polishing powder by spray pyrolysis
  • A method and device for preparing cerium-based rare earth polishing powder by 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 50g / 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

A method and device for preparing cerium-based rare earth polishing powder by spray thermal decomposition, which belongs to the field of material technology. The method is carried out according to the following steps: (1) Dissolve rare earth chloride and fluorine-containing additives in water to make a solution; (2) Use air The carrier gas is used to spray the solution into the roasting furnace for roasting, and the roasted slag generated by roasting is naturally cooled to obtain cerium-based rare earth polishing powder. The device includes a roasting furnace and a cyclone separation device. The inlet at the bottom of the roasting furnace is connected to the blow pipe, the blow pipe is connected to the liquid inlet tank, and the liquid tank is connected to the outlet of the air compressor. The cyclone separation device is composed of at least two stages of cyclone separators connected in series. , the outlet of the last stage cyclone separator is connected with the inlet of the tail gas absorption tower. The F element in the cerium-based rare earth polishing powder prepared by the method of the present invention only exists in the form of CeF3, which can realize the direct decomposition of the rare earth chloride mixed solution to obtain the cerium-based rare earth polishing powder, and avoids the precipitation of ammonium bicarbonate or fluorosilicic acid in the roasting method. consumption of raw materials.

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 Patents(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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