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Method for preparing magnesium silicide-based powder thermoelectric material by utilizing polysilicon byproduct

A technology of thermoelectric materials and by-products, applied in the direction of nanotechnology for materials and surface science, metal silicide, hydrogen production, etc., can solve the problems of difficult SiCl recovery and reduce production costs

Inactive Publication Date: 2014-07-23
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of a method for preparing magnesium-silicon-based thermoelectric materials by using polysilicon by-products in the present invention is to solve the problem of SiCl in the prior art. 4 Recycling is difficult, thus disclosing a method that utilizes polysilicon by-product SiCl 4 Preparation of Mg 2 The technical solution of Si new thermoelectric material, which reduces the production cost and solves the problem of SiCl 4 The problem of difficult recovery, the reaction product Mg 2 Si belongs to green energy, reducing environmental pollution

Method used

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  • Method for preparing magnesium silicide-based powder thermoelectric material by utilizing polysilicon byproduct

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Experimental program
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Effect test

Embodiment approach 1

[0016] First weigh 0.26mol of MgH 2 (particle size≤45μm, purity≥99.5%) and 1.04mol of C 4 h 8 O (purity 99.2%) was placed in the three-necked flask 4, and sealed, and then weighed 0.13mol of MgH 2 (particle size ≤ 45μm, purity ≥ 99.5%) placed in U-shaped reactor 10, and sealed, the three-necked flask 4 and filter device 5, drying device 6, gas cylinder 7, pressure reducing valve 8, flow meter 9, The U-shaped reactor 10 and the mineral oil 12 are connected sequentially by quartz tubes, wherein the three-necked flask 4 is immersed in a glycerin bath 13 with a temperature of 120 ° C, and is continuously stirred with an electric stirrer 2 , and the U-shaped reactor 10 is placed in a heating furnace 11 . First pass 80ml / min of carrier gas Ar into the entire connection device for cleaning for 5min, then adjust the flow rate to 20ml / min, and inject 0.065mol of SiCl with syringe 3 4 (purity 99%) was injected into the three-necked flask 4, and the product SiH was obtained after the...

Embodiment approach 2

[0018] First weigh 0.13mol of MgH 2 (particle size≤45μm, purity≥99.5%) and 1.04mol of C 4 h 8 O (purity 99.2%) was placed in the three-necked flask 4, and sealed, and then weighed 0.13mol of MgH 2(particle size ≤ 45μm, purity ≥ 99.5%) placed in U-shaped reactor 10, and sealed, the three-necked flask 4 and filter device 5, drying device 6, gas cylinder 7, pressure reducing valve 8, flow meter 9, The U-shaped reactor 10 and the mineral oil 12 are connected sequentially by quartz tubes, wherein the three-necked flask 4 is immersed in a glycerin bath 13 with a temperature of 125°C, and is continuously stirred with an electric stirrer 2, and the U-shaped reactor 10 is placed in a heating furnace 11 . First pass 80ml / min of carrier gas Ar into the entire connecting device for cleaning for 8min, then adjust the flow rate to 20ml / min, and inject 0.065mol of SiCl with syringe 3 4 (purity 99%) was injected into the three-necked flask 4, and the product SiH was obtained after the rea...

Embodiment approach 3

[0020] First weigh 0.13mol of MgH 2 (particle size≤45μm, purity≥99.5%) and 0.52mol of C 4 h 8 O (purity 99.2%) was placed in the three-necked flask 4, and sealed, and then weighed 0.13mol of MgH 2 (particle size ≤ 45μm, purity ≥ 99.5%) placed in U-shaped reactor 10, and sealed, the three-necked flask 4 and filter device 5, drying device 6, gas cylinder 7, pressure reducing valve 8, flow meter 9, The U-shaped reactor 10 and the mineral oil 12 are connected sequentially by quartz tubes, wherein the three-necked flask 4 is immersed in a glycerin bath 13 with a temperature of 130° C. and continuously stirred with an electric stirrer 2 , and the U-shaped reactor 10 is placed in a heating furnace 11 . First pass 80ml / min of carrier gas Ar into the entire connection device for cleaning for 10min, then adjust the flow rate to 20ml / min, and use syringe 3 to inject 0.065mol of SiCl 4 (purity 99%) was injected into the three-necked flask 4, and the product SiH was obtained after th...

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Abstract

A method for preparing magnesium-silicon-based thermoelectric materials by using polysilicon by-products belongs to the field of thermoelectric material preparation, specifically, it is a technical solution for preparing Mg2Si new thermoelectric materials by using polysilicon by-products SiCl4, especially it can be prepared by using polysilicon by-products. New green energy thermoelectric conversion materials. It is characterized in that SiCl4, a toxic by-product of polysilicon, is firstly reacted with Mg2H dissolved in an organic solvent tetrahydrofuran to generate SiH4 gas, and then the SiH4 gas is heated and reacted with Mg2H to obtain a Mg2Si-based thermoelectric material. The method is characterized by rich sources of raw materials and simple process, and the prepared Mg2Si thermoelectric material has good thermoelectric properties, which not only solves the problem of difficult recovery of polysilicon by-product SiCl4, but also reduces production costs, reduces environmental pollution, and provides Production methods of new energy materials.

Description

technical field [0001] The invention discloses a method for preparing magnesium-silicon-based thermoelectric materials by using polysilicon by-products, which belongs to the field of thermoelectric materials preparation, and specifically utilizes polysilicon by-products SiCl 4 Preparation of Mg 2 The technical solution for the preparation of new Si thermoelectric materials, especially the ability to use the toxic by-products of polysilicon to prepare new green energy thermoelectric conversion materials. Background technique [0002] Polysilicon production technologies include: improved Siemens method, silane method and fluidized bed method. There are also new processes for producing low-cost polysilicon by metallurgical method, gas-liquid deposition method, and heavily doped silicon waste method, among which the Siemens method is the most used to produce polysilicon. The Siemens method (trichlorosilane reduction method) is based on HCl (Cl 2 、H 2 ) and metallurgical grad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/06C01B3/06B82Y30/00
CPCY02E60/362Y02E60/36
Inventor 陈少平张霞李育德张机源樊文浩孟庆森易堂红
Owner TAIYUAN UNIV OF TECH