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Purification method

A semi-metal and reagent technology, applied in the field of purification, can solve the problem of expensive solar cells

Inactive Publication Date: 2010-03-03
INTRINSIQ MATERIALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Currently, there is no dedicated production method for intermediate-grade photovoltaic silicon, so solar cells are produced from the expensive raw material silicon

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0043] The reaction stoichiometry indicated that 5 grams of silica (0.0833 moles) required 1.25 molar equivalents or 2.81 grams of aluminum. 2.6 grams of aluminum were actually used as fine flake material and mixed well with the silica by shaking in a glass container with a stopper. The appearance of the mixed powder was light gray except for small clumps of agglomerated silica. The mixed powders were added to a quartz crucible and heated at a rate of 50° C. per minute in a box furnace under a nitrogen atmosphere. When the reaction temperature reached 800°C, start counting the reaction time.

[0044] After one hour, the sample was cooled to 100°C under a nitrogen purge at a rate of about 50°C per minute, and the sample was removed from the crucible. The material turns substantially black and the particles stick together. Part of the silica remained as an unreacted mass from the agglomerated mass seen at the beginning of the reaction. Optical microscopy observations indicat...

Embodiment 2

[0046] A slight excess of said sample of Degussa's fumed silica and a second sample from AlfaAesar were added to aluminum flakes and each independently reduced to silicon at 900°C over a period of one hour . The same reaction product as in Example 1 was produced.

Embodiment 3

[0048] Aluminum flakes were added to each silica sample separately and heated at 650° C. using the conditions of Examples 1 and 2 for one hour. The product appeared to be essentially unreacted and consisted mainly of white silica powder and aluminum microspheres.

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Abstract

A method for removing one or more substances from a starting material comprising a metal, a semi-metal, a metal compound or a semi-metal compound comprises the steps of mixing fine particles of said starting material with a reagent Y and heating the starting material so as to effect a diffucion interface between the starting material and the reagent Y such that the one or more substances migrate from the nanoparticle to reagent Y. Purified metal or semi-metal particles are thereby produced. The method can be used for the production of photovoltaic grade silicon.

Description

technical field [0001] The present invention relates to a method for removing one or more substances from raw materials containing metals, semi-metals, metal compounds or semi-metal compounds using chemical reagents, wherein the raw materials are in the form of fine particles, preferably nanoparticles. More specifically, the present invention relates to the production of high purity silicon from nanoparticles of silica, silicates and / or metallurgical grade silicon. Background technique [0002] Silicon is widely used in the electronics industry, for example in the production of semiconductors, integrated circuits and photovoltaic cells (also known as solar cells). Usually very high purity is required, the exact purity grade depends on the final application. Typically, the purity of photovoltaic grade silicon (at least 99.9999%) is lower than that of electronic grade silicon (>99.9999999%). Important impurities that need to be removed include: transition elements in the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/037C22B5/04C22B5/06C22B9/14C22B9/22
CPCC01B33/023C22B61/00C22B9/14C22B5/10C22B4/005C22B5/12C01B33/037C22B5/04C22B5/06C22B9/226B82Y99/00
Inventor D·约翰逊J·托多尔A·W·基纳斯顿-皮尔逊A·B·戈弗雷
Owner INTRINSIQ MATERIALS LTD
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