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Resource utilization system for waste polishing powder and method thereof

A polishing powder and recycling technology, which is applied in the field of waste polishing powder resource utilization system, can solve the problems of difficult to realize polishing powder reuse, difficult to completely solve environmental problems, resource recovery problems, environmental pollution and other problems

Active Publication Date: 2020-06-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above three methods have disadvantages, among which the flotation method is only a physical process to initially separate the impurities in the polishing powder, and it is difficult to realize the reuse of the polishing powder. Environmental issues and resource recovery issues; no matter whether the waste rare earth polishing powder is treated by the strong acid method or the strong alkali method, although the leaching rate of rare earth oxides is relatively high, reaching more than 90%, the rare earth content in the waste rare earth polishing powder is only 3%~ 5%, there are excessive strong acid or strong alkali in the leaching process, the formation of salt and the treatment of secondary tailings, causing environmental pollution; although flotation combined with strong acid and strong alkali leaching can enrich rare earth elements to a certain extent, but It only reduces the amount of acid and alkali, and does not realize the problem of harmless treatment of waste rare earth polishing powder

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  • Resource utilization system for waste polishing powder and method thereof
  • Resource utilization system for waste polishing powder and method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] This embodiment provides a method for resource utilization of waste polishing powder, the method is as follows:

[0092] (1) Mix and pulverize the waste polishing powder and sodium carbonate, and then roast to obtain a roasted material; wherein, the molar ratio of the sodium carbonate to the total molar weight of aluminum and silicon in the waste polishing powder is 1.3:1; The pulverization adopts ball milling; the particle size of the pulverized material is ≤74 μm; the roasting temperature is 950° C.; the roasting time is 60 minutes;

[0093] (2) The calcined material obtained in step (1) is mixed with water and then leached, followed by solid-liquid separation to obtain filtrate and rare earth solids; wherein, the leaching method is pressure heating leaching; the pressure leaching The pressure is 0.3MPa; the heating medium in the pressurized heating leaching is steam; the pressure of the steam is 0.5MPa; the temperature of the steam is 150°C; the temperature of the le...

Embodiment 2

[0098] This embodiment provides a method for resource utilization of waste polishing powder, the method is as follows:

[0099] (1) Mix and pulverize the waste polishing powder and sodium carbonate, and then roast to obtain a roasted material; wherein, the molar ratio of the sodium carbonate to the total molar weight of aluminum and silicon in the waste polishing powder is 1.5:1; The pulverization adopts ball milling; the particle size of the pulverized material is ≤74 μm; the roasting temperature is 850° C.; the roasting time is 90 minutes;

[0100] (2) The calcined material obtained in step (1) is mixed with water and then leached, followed by solid-liquid separation to obtain filtrate and rare earth solids; wherein, the leaching method is pressure heating leaching; the pressure leaching The pressure is 0.5MPa; the heating medium in the pressurized heating leaching is steam; the pressure of the steam is 0.6MPa; the temperature of the steam is 160°C; the temperature of the leac...

Embodiment 3

[0105] This embodiment provides a method for resource utilization of waste polishing powder, the method is as follows:

[0106] (1) waste polishing powder and sodium carbonate are mixed and pulverized, then roasted to obtain roasted material; wherein, the ratio of the molar weight of sodium carbonate and the total molar weight of aluminum and silicon in the waste polishing powder is (1.4): 1; the pulverization adopts ball mill; the particle size of the pulverized material is ≤74 μm; the roasting temperature is 870° C.; the roasting time is 80 min;

[0107] (2) The calcined material obtained in step (1) is mixed with water and then leached, followed by solid-liquid separation to obtain filtrate and rare earth solids; wherein, the leaching method is pressure heating leaching; the pressure leaching The pressure is 0.35MPa; the heating medium in the pressurized heating leaching is steam; the pressure of the steam is 0.55MPa; the temperature of the steam is 155°C; the temperature o...

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Abstract

The invention relates to a resource utilization system for waste polishing powder and a method thereof. The system comprises a material conveying unit, a roasting unit, a leaching unit, a carbonationunit and a sodium carbonate recovery unit. A discharge port of the material conveying unit is connected with a feed port of the roasting unit; a discharge port of the roasting unit is connected with asolid feed port of the leaching unit; a first material pump and a first filter are sequentially arranged between the leaching unit and the carbonation unit; a second material pump and a second filterare sequentially arranged between the carbonation unit and the sodium carbonate recovery unit; a discharge port of the carbonation unit is connected with a feed port of the second material pump; anda filtrate outlet of the second filter is connected with a feed port of the sodium carbonate recovery unit. By means of the method, rare earth, sodium, aluminum, silicon and other elements in the waste polishing powder can be efficiently recycled, the sodium carbonate medium is recycled, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to solid waste utilization, in particular to a resource utilization system and method for waste polishing powder. Background technique [0002] In recent years, with the rapid development of optics, electronic instruments and information technology, the requirements for the polishing accuracy of the material surface are getting higher and higher, which greatly promotes the development of rare earth polishing powder. The consumption of rare earth polishing powder in my country averages 30% per year. The speed is increasing, and the discharge of waste rare earth polishing powder is also increasing year by year. At present, the annual production of waste rare earth polishing powder has exceeded 50,000 tons. The waste rare earth polishing powder contains not only rare earth oxides, but also optical glass powder phase. On the one hand, it is affected by the national rare earth mineral resource protection development policy, resulting in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/00C01F17/229C01F17/235C01F17/10C01F7/02C01B33/12
CPCC01B33/12C01D7/00C01F7/02C01P2006/80Y02P20/141
Inventor 王云山肖炘杨刚安学斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI