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Hyperpure, superfine silicon powder and preparation method

A technology of ultra-fine silicon powder and its production method, which is applied in the direction of silicon oxide, silicon dioxide, fibrous filler, etc., and can solve the problem of foreign exchange consumption

Inactive Publication Date: 2005-01-12
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consumed a lot of foreign currency

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  • Hyperpure, superfine silicon powder and preparation method

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Embodiment Construction

[0016] The main components of the silicon powder are: more than 99.96% of silicon dioxide, less than 0.003% of iron, the diameter of the silicon powder particles is less than 1 micron, and the outer surface of the silicon powder particles is coated with a silane coupling agent. The rest are some residual other metal elements, such as: silver, gold and so on.

[0017] 1. Material pretreatment:

[0018] First, beneficiation standard: SIO 2 ≥99.85% or more;

[0019] Second, appearance standard: A, white as jade; or B, crystalline and transparent; or C, black or reddish-yellow in the crystalline body;

[0020] Third, roughly crush the large raw ore block to 6-20 cm;

[0021] Fourth, wash the ore with clean water to remove impurities, then cool it in the sun, and manually select unqualified raw ore. Some lumps of ore are covered with a layer of impurities, which should be removed by grinding on a grinding wheel.

[0022] 2. Roasting and calcination:

[0023] The push plate typ...

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Abstract

The invention relates to a semiconductor material, in particular to a method for producing superfine and superpure ganister sand. Its main compositions are: silica is more than 99.96 percent, iron is less than 0.003 percent, diam of the ganister sand partical is less than 1 um and its outside surface is clad by silane bimorph agent. The producing steps are: a. material pretreatment; b. roasting and baking; c. grinding, cold ore is send into column grinder to be grinded to ganister sand with size 325 mesh; d. screening and magnetic separating, said ganister sand is send into screener to be screened, the one less than 325 is send into magnetic separater separater to get rid of magnetic substances in it; e. chemical refining, the ganister sand without magnetic substance is put into reaction container to react to react with weak acid solution mixed with weak hydrofluoric acid and weak hydrochloric acid; f. drying; g. supersonic airflow crushing and modifying.

Description

technical field [0001] The invention relates to a semiconductor material, in particular to an ultrafine, ultrapure silicon powder and a production method thereof. Background technique [0002] Silicon material is the most of more than 100 kinds of elements in nature. Silicon micropowder, ultrafine powder, optical fiber and silicon nanomaterials are all raw materials for emerging industries. The development of high-tech industries has a great impact on silicon materials, especially ultra-pure and ultra-fine silicon materials. The demand for silicon materials is getting higher and higher, and the ultra-pure and ultra-fine properties of silicon materials determine the optical properties, electrical properties, stacking properties, adsorption properties, rheological properties, melting properties, firing temperature, firing time and chemical reaction rate of the product. and other performance indicators. Therefore, ultra-pure, ultra-fine, compound modified processed products an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/113C01B33/18C09C1/28
Inventor 张永诚
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