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Method recovering rare earth from precise instrument waste glass materials

A glass waste and precision instrument technology, applied in the field of glass instrument waste treatment, can solve the problems of resource waste, environmental pollution, etc., and achieve the effect of low cost

Active Publication Date: 2013-06-05
荆门格林循环电子废弃物处置有限公司
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Problems solved by technology

However, there is no method in the prior art that can effectively recycle rare earth elements and borates or silicates contained in precision instrument glass waste, resulting in waste of resources and environmental pollution.

Method used

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  • Method recovering rare earth from precise instrument waste glass materials

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example 1

[0048] The method of the present invention is described below with a specific process for treating waste precision instrument glass, but it is not intended as a limitation to the protection scope of the present invention.

[0049] First, take 100g of waste precision instrument glass and grind it finely with a ball mill. The final average particle size of waste glass is 0.05mm.

[0050] Mix the above-mentioned glass powder with sodium hydroxide solution with a concentration of 8 mol / l, the mass ratio of sodium hydroxide to glass powder is 1:2.2, and then bake at 400°C for 3 hours.

[0051] The roasted material was washed with hot water at 75°C, with a solid-to-liquid ratio of 1:4.5, stirred and washed for 3 hours, and filtered. The filtrate contains silicate, borate, etc., and the filter residue contains rare earth elements.

[0052] The filtrate is stirred at 90°C and adjusted to pH 4.5 with 2.5 mol / l sulfuric acid to precipitate silicon. The supernatant is concentrated and c...

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Abstract

The method provides a method recovering rare earth from precise instrument waste glass materials. The method comprises the following steps of levigating waste glass materials, roasting in an alkali method to enable acid oxide to be dissolved in molten alkali, washing and filter to remove soluble salt after roasting, using acid to adjust potential of hydrogen (pH) of filter liquor to enable silicic acid to settle, obtaining boric acid through concentration crystallization to separate silicic acid from the boric acid, acid dissolving, oxidizing and settling filter residue, filtering to obtain tetravalent cerium hydroxide and filter liquor, settling lanthanum through a double-salt sedimentation method, and separating yttrium from gadolinium. The method can conveniently and effectively purify and prepare rare earth products from optical waste glass materials to comprehensively recover silicon dioxide, boric oxide and rare earth.

Description

technical field [0001] The invention relates to the field of glass instrument waste treatment, in particular to a method for recovering rare earth from precision instrument glass waste. Background technique [0002] At present, there are more than 300 kinds of rare earth optical glass, which are widely used in the production of microscopes, telescopes, periscopes, movie cameras, cameras, video cameras, aerial photography and other optical instruments. [0003] These precision instrument glass wastes are generally mainly optical glass containing borate or silicate systems. Generally, it mainly contains lanthanum, and rare earth elements such as yttrium, gadolinium, cerium, etc., and its content is generally 10-45% in terms of rare earth oxides. However, there is no method in the prior art that can effectively recover rare earth elements, borates or silicates contained in precision instrument glass waste, resulting in waste of resources and pollution of the environment. Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B7/00
CPCY02P10/20
Inventor 许开华王勤何显达苏陶贵
Owner 荆门格林循环电子废弃物处置有限公司
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