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Preparation method of high-purity aluminum metaphosphate powder

A high-purity aluminum metaphosphate technology, applied in the field of preparation of high-purity aluminum metaphosphate powder, can solve the problems of difficult separation, complicated operation, and easy pollution of aluminum metaphosphate, and achieve the effect of small equipment investment and high purity

Pending Publication Date: 2019-08-13
JIANGSU GUOSHENG RARE EARTH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The thermal efficiency of this method is low, and the aluminum metaphosphate product obtained is easily polluted by the nozzle, and a high-purity product cannot be obtained
Patent CN200710108995 discloses a method of mixing aluminum oxide, aluminum hydroxide or aluminum phosphate with phosphoric anhydride and polyphosphoric acid into a sintering container previously covered with aluminum metaphosphate powder. The obtained aluminum metaphosphate cannot avoid being bonded to the sintered container and is not easy to separate, which brings a lot of inconvenience to the production
Patent CN201110252987.2 discloses a method for producing high-purity aluminum metaphosphate by temperature-controlled step-by-step conversion. This method prepares high-purity aluminum metaphosphate by sintering in stages, but still cannot solve the problem of bonding the product to the sintered container
Moreover, the aluminum metaphosphate obtained by the above two methods is a block solid. In order to obtain powdered aluminum metaphosphate, it is often necessary to use crushing equipment
Aluminum metaphosphate is very easily polluted during the crushing process, and the purity of the obtained aluminum metaphosphate is not high enough

Method used

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  • Preparation method of high-purity aluminum metaphosphate powder
  • Preparation method of high-purity aluminum metaphosphate powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 100kg of electronic-grade phosphoric acid (concentration: 76%) into the reaction kettle, add 20kg of purified water, stir and raise the solution temperature to 50°C, add 26.1kg of high-purity aluminum hydroxide (solid content: 80%), and react for 1 hour to obtain phosphoric acid. Aluminum dihydrogen phosphate solution; place the aluminum dihydrogen phosphate solution in a sintered container lined with polytetrafluoroethylene, heat it to 230°C for dehydration for 6 hours, and convert it into acid aluminum phosphate monohydrate; place the acid aluminum phosphate monohydrate solid in a humidified In the device, hot air at 70°C with a relative humidity of 60% was introduced, weathered for 5 hours, and acid aluminum phosphate monohydrate was converted into powdered aluminum acid phosphate by utilizing the characteristics of water absorption and weathering of acid aluminum phosphate monohydrate; The acid aluminum phosphate powder is roasted at 750°C for 7 hours in a heatin...

Embodiment 2

[0031] Add 100kg of electronic-grade phosphoric acid (concentration 76%) into the reaction kettle, add 40kg of purified water, stir and raise the solution temperature to 100°C, add 24.4kg of high-purity aluminum hydroxide (solid content 80%), and react for 1.2h after the solution is clarified to obtain Aluminum dihydrogen phosphate solution; put the aluminum dihydrogen phosphate solution in a sintered container lined with polytetrafluoroethylene, heat to 240°C for dehydration for 4 hours, and convert it into acid aluminum phosphate monohydrate; put the solid acid aluminum phosphate monohydrate in In the humidifying device, and feed hot air with a relative humidity of 65% at 90°C for weathering for 4 hours, using the characteristics of water absorption and weathering of acid aluminum phosphate monohydrate to convert acid aluminum phosphate monohydrate into acid aluminum phosphate powder; The acid aluminum phosphate powder is roasted at 900°C for 3 hours in a heating furnace to c...

Embodiment 3

[0033] Add 100kg of electronic-grade phosphoric acid (concentration 76%) to the reaction kettle, add 60kg of purified water, stir and raise the solution temperature to 60°C, add 25.2kg of high-purity aluminum hydroxide (solid content 80%), and react for 1.5h after the solution is clarified to obtain Aluminum dihydrogen phosphate solution; put the aluminum dihydrogen phosphate solution in a sintered container lined with polytetrafluoroethylene, heat it to 235 ° C for 2 hours to convert it into acid aluminum phosphate monohydrate; put the solid acid aluminum phosphate monohydrate in In the humidification device, the hot air at 75°C with a relative humidity of 70% is introduced, and weathered for 2 hours. Using the characteristics of water absorption and weathering of acid aluminum phosphate monohydrate, acid aluminum phosphate monohydrate is converted into acid aluminum phosphate powder; The acid aluminum phosphate powder is roasted at 850°C for 5 hours in a heating furnace to co...

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Abstract

The invention discloses a preparation method of a high-purity aluminum metaphosphate powder. The preparation method comprises the four steps of preparation of an aluminum dihydrogen phosphate (Al(H2PO4)3) solution, preparation of acid aluminum phosphate monohydrate (AlH2P3O10.H2O), preparation of powdery acid aluminum phosphate and preparation of powdery aluminum metaphosphate. According to the method, the prepared aluminum metaphosphate can be prepared into the powdery aluminum metaphosphate without pulverizing equipment, bonding to a sintering container does not occur in the production process, the prepared aluminum metaphosphate has high purity, the concentration of various non-ferrous metal element impurities is 5 ppm or below, the equipment investment required for the process is small, and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a preparation method of high-purity aluminum metaphosphate powder, which belongs to the technical field of chemical industry. Background technique [0002] Metaphosphate is the most stable type of phosphate, and it is often used as high-temperature adhesive for phosphate optical glass, high-temperature lubricant, semiconductor material, dispersant, and matrix glass for some precision machinery and measuring instruments. High-purity aluminum metaphosphate is the basic raw material for manufacturing metaphosphate glass because of its good light transmission performance, and is an important raw material for laser glass in high-power lasers. [0003] The traditional method of preparing high-purity aluminum metaphosphate is to use a spray dryer to spray and pyrolyze the aluminum dihydrogen phosphate solution generated after the reaction of phosphoric acid and aluminum hydroxide at a temperature of 700°C to 750°C. The method has low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/44
CPCC01B25/44C01P2006/80C01P2002/72
Inventor 娄战荒彭福郑姚栋伟
Owner JIANGSU GUOSHENG RARE EARTH CO LTD
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