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Method for preparing high-purity fused silica by recovering waste quartz crucible

A quartz crucible and fused silica technology, which is applied in the field of fused silica material preparation, can solve the problems of difficulty in guaranteeing the purity of fused silica, different grades of raw quartz ore, and large differences in impurity content, and is beneficial to the protection and solution of land resources. Pollution and emission problems, the effect of realizing recycling

Inactive Publication Date: 2012-07-11
徐州协鑫太阳能材料有限公司
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Problems solved by technology

However, the grades of raw quartz ore vary greatly across the country, and the impurity content varies greatly. The purity of fused quartz produced by traditional techniques is not easy to guarantee.

Method used

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Experimental program
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Embodiment Construction

[0025] The method for recovering waste quartz crucibles to produce high-purity fused silica in this embodiment includes steps such as crushing and classification, pickling to remove impurities, water washing and drying, and amorphization treatment. The specific methods of each step are as follows.

[0026] Broken classification:

[0027] Using scrap crucibles manufactured by quartz crucibles and / or used by polysilicon ingot casting enterprises as raw materials, mechanical crushing and vibration screening are carried out to make blocks of 1-50 mm.

[0028] Pickling and impurity removal:

[0029] The block is pickled with mixed acid, the concentration of the mixed acid is 1-25% (weight ratio), the weight ratio of the block to the mixed acid is 1:1-5, and the pickling time is 4-200 hours.

[0030] Preferably, the mixed acid is a binary mixed acid of oxalic acid and hydrochloric acid or a ternary mixed acid of hydrofluoric acid, oxalic acid and hydrochloric acid; The weight rati...

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Abstract

The invention discloses a method for preparing high-purity fused silica by recovering waste quartz crucible, which comprises steps of smash classification, scouring edulcoration, washing stoving and amorphization treatment and the like. The high-purity fused silica meeting use requirements of the quartz crucible can be obtained through that fact that purification edulcoration and the amorphization treatment are carried out on quartz crucible waste, so that excessive depending on quartz raw ore can be obviously remitted, cyclic utilization of quartz sands can be achieved, the method is applicable to protection of territorial resources, greatly reduces cost of manufacture of quartz ceramic crucible, simultaneously solves contamination and discharge problems of solid waste of quartz crucible production and using enterprises.

Description

【Technical field】 [0001] The invention relates to a method for preparing fused silica material, in particular to a method for recovering waste quartz crucibles to prepare high-purity fused silica. 【Background technique】 [0002] In recent years, with the continuous attention and development of environmental protection energy, solar energy as a green energy has been widely valued by countries all over the world, and has been widely developed and utilized. develop. Fused quartz ceramic crucible is a container used to load polysilicon raw materials in the process of solar polysilicon ingot casting, and melt and crystallize it at a high temperature of 1550°C to produce polysilicon ingots. It must work continuously for more than 50 hours at one time, and the whole process cannot be broken. , the crucible components can not cause pollution to the silicon material, and it is an irreplaceable key consumable part in the production process of polysilicon ingots. With the expansion o...

Claims

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Application Information

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IPC IPC(8): C03B5/16C03C6/04
Inventor 何钊煊王金波孙前颂
Owner 徐州协鑫太阳能材料有限公司
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