Composite heat storage material and preparation method thereof

A technology of heat storage materials and molding materials, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of general heat storage capacity, high cost, and small specific heat, so as to improve physical stability and good pressure resistance Performance, enhanced fire resistance effect

Inactive Publication Date: 2010-02-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, these preparation technologies have the following disadvantages: 1) The specific heat is small, and the heat storage capacity is average; 2) During the molding and pressing process of heat storage materials, high-cost binders need to be used; 3) Only suitable for medium and low temperature heat storage fields
As a result, this type of composite heat storage material cannot be used in the field of high-temperature heat storage, and the energy storage density is average, and the preparation cost is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 1.4g of bauxite tailings (with a particle size of about 19μm) and 1.2g of clay, mix them evenly, and add water until they are soaked. Add 17.4g of hematite into it and mix well. Place it in a ventilated place and dry until the moisture content is 4wt%, then place the mixture in a mold, press and shape it, and make a test block. After the test piece is dried in an oven at 100°C, it is fired at 950°C and cooled to become a heat storage material. The specific heat of the test block is 0.153cal g by JR-3 laser thermal conductivity meter -1 ·K -1 , the thermal conductivity is 1.30W·m -1 ·K -1 .

Embodiment 2

[0015] Take 1.4g of bauxite tailings (with a particle size of about 12μm) and 1.2g of clay, mix them evenly, and add water until they are soaked. Add 17.4g of hematite into it and mix well. Place it in a ventilated place to dry until the moisture content is 3wt%, then place the mixture in a mold, press and shape it, and make a test block. After the test piece is dried in an oven at 100°C, it is fired at 950°C and cooled to become a heat storage material. The specific heat of the test block is 0.150cal g by JR-3 laser thermal conductivity meter -1 ·K -1 , the thermal conductivity is 1.18W·m -1 ·K -1 .

Embodiment 3

[0017] Take 3.0 g of bauxite tailings (with a particle size of about 19 μm) and 3.0 g of clay, mix them evenly, and add water until they are soaked. Add 14.0g of hematite into it and mix well. Place it in a ventilated place and dry until the water content is 2wt%, then place the mixture in a mold, press and shape it, and make a test block. After the test piece is dried in an oven at 100°C, it is fired at 950°C and cooled to become a heat storage material. The specific heat of the test block is 0.166cal g by JR-3 laser thermal conductivity meter -1 ·K -1 , the thermal conductivity is 1.18W·m -1 ·K -1 .

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Abstract

The invention discloses a composite heat storage material and a preparation method thereof. The composite heat storage material is prepared by adopting hematite ore as main material, bauxite tailing as forming material and clay as auxiliary material and adding water to mix. The proportioning of the materials is that the contents of hematite ore, bauxite tailing and clay are separately 70-87%, 7-15% and 6-15%. The preparation method comprises the following steps: firstly mixing the materials: mixing tailing and clay evenly, adding water for soaking, then adding hematite ore to mix, placing themixture in a ventilated place while controlling the moisture content; then shaping: placing the mixed materials in moulds to form and prepare test blocks; then drying: placing the test blocks in a oven to dry; finally roasting and cooling to obtain the heat storage material. The specific heat of the heat storage material is 0.150-0.166cal-g<-1>-K<-1> and the thermal conductivity is 1.18-1.30W-m<-1>-K<-1>. The preparation method of the heat storage material is characterized by easy process, low cost, higher value of mineral tailing and the like and the prepared composite heat storage material has high specific heat and good heat conductivity.

Description

technical field [0001] The invention belongs to the fields of energy materials and thermal energy engineering, and relates to a composite heat storage material and a preparation method thereof. Background technique [0002] Composite heat storage materials play an important role in the fields of energy materials and thermal energy engineering. The performance and cost of composite heat storage materials are important factors that determine whether they can be widely promoted and used in these fields. Therefore, it is very important to develop composite heat storage materials with high energy storage density and low cost. [0003] At present, composite heat storage materials are mainly capsule type, inorganic salt / ceramic matrix composite type, and organic / inorganic composite heat storage materials. The binder binds raw materials with different phases. At present, these preparation technologies have the following disadvantages: 1) The specific heat is small, and the heat st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/00
Inventor 杨华明李传常唐爱东欧阳静
Owner CENT SOUTH UNIV
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