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A kind of grouting slurry for preparing high-strength quartz crucible and its preparation method

A quartz crucible and high-strength technology, which is applied in the field of grouting slurry for preparing high-strength quartz crucibles and the field of preparation, can solve the problem that the needs of the production field of monocrystalline silicon or polycrystalline silicon cannot be met, the gradation ratio is not optimal, and it is uncomfortable. Vacuum grouting process and other problems, to achieve the effect of good fluidity, reduced product cracks, and good electrical properties

Inactive Publication Date: 2014-10-29
YICHANG KENNSUN SOLAR ENERGY MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent document CN101880166B provides a method for preparing a large-scale quartz ceramic crucible, which adopts four kinds of particle grading methods to configure the slurry, but this kind of ratio is not optimal. The problem is that the finished product has insufficient strength and cannot meet the requirements of single crystal. Needs in the field of silicon or polysilicon production
The problem is that the grading ratio is not optimal, and because of the low water content, it is not suitable for vacuum grouting process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A grouting slurry for preparing a high-strength quartz crucible, comprising the following high-purity quartz sand by weight percentage, and the high-purity quartz sand is SiO by weight percentage 2 ≥99.99%, and Al 2 o 3 ≤68ppm, Fe 2 o 3 ≤26ppm, K 2 O≤10ppm, Na 2 O≤15ppm.

[0036] Among them, material A and material B are 62~72%, material C is 20~28%, and material D is 7~11%;

[0037] Preferably, material A and material B are 67% by weight, material C is 24%, and material D is 9%.

[0038] Among them, material A: material B is 10~12:25 in parts by weight;

[0039] Further preferably, the ratio of material A: material B is 11:25.

[0040] Material A has a particle size of 2~60mm, material B has a particle size of 4~20 mesh, material C has a particle size of 50~100 mesh, and material D has a particle size of 100~200 mesh;

[0041] 79~81% of material A and material B by weight percentage are mixed with 19~21% of deionized water, after being ball milled in a ball mi...

Embodiment 2

[0046] On the basis of embodiment 1 proportioning, a kind of method for preparing above-mentioned grouting slurry comprises the following steps:

[0047] 1. Put material A and material B into the ball mill, the ratio of material A: material B is 10~12:25 in parts by weight, add deionized water, and the ratio of material A and material B in weight percentage is 79~81 with deionized water 19~21% mixed;

[0048] 2. After ball milling for 10~13 hours, press into the homogenization tank;

[0049] The conductivity in the ball mill tank should be controlled within the range of 10~35μS / cm, the conductivity of the deionized water used should be less than 5μS / cm, the particle size of the slurry should be 1.47μm3 , the liquidity requirement is 65~75s.

[0050] 3. Homogenize in the homogenization tank for at least 12 days to improve the suspension performance of the slurry;

[0051] During the homogenization period, the density of the slurry is changed from 1.745 to 1.775 g / cm 3 Gradua...

Embodiment 3

[0056] On the basis of Examples 1 and 2, this will be further described with specific numerical values.

[0057] 1. Ball mill loading, 1625Kg of high alumina balls with diameters of 30, 40, 50 and 60mm have been added to the ball mill in advance.

[0058] Load 3600Kg of raw materials into the ball mill, the 3600Kg of raw materials are: 2200Kg 4~20 mesh pellets and 300Kg 4-20 mesh recycled pellets, namely B material, 1100Kg particle size 2~60mm blocks, namely A material, and then Add 950L of deionized water and 6.5 kg of 60mm diameter ball stones. After the ball mill is installed, it will be milled for 11 hours and pressed into the homogenization tank.

[0059] Process parameters to be controlled in this step: the conductivity in the ball mill tank should be controlled within the range of 10~35μS / cm, the conductivity of deionized water should be less than 5μS / cm, and the particle size of the abrasive should be 1.47μm3 , the liquidity requirement is 65~75s. The fluidity te...

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Abstract

The invention discloses grouting slurry for preparing a high strength quartz crucible, and a preparation method of the grouting slurry. The grouting slurry comprises high purity quartz sand in percentage by weight, wherein a material A and a material B are respectively 62-72%, a material C is 20-28%, and a material D is 7-11%; the grain size of the material A is 2-60mm, the granularity of the material B is 4-20 meshes, the granularity of the material C is 50-100 meshes, and the granularity of the material D is 100-200 meshes; the material A and the material B counted in percentage by weight are mixed with deionized water, after being milled by a ball mill and homogenized by a homogenization pot, the mixture is mixed with the material C and the material D, and the grouting slurry for preparing the high strength quartz crucible is obtained after stirring. According to the preparation method, descending four-grade grain size graduation is used, and a homogenization process is added, thus, preparation of the high strength quartz crucible is realized, and the prepared slurry has good liquidity and is suitable for vacuum grouting technology. By means of twice mixing, two materials with small grain size are added after the homogenization process, thus, energy consumption is lowered.

Description

technical field [0001] The invention relates to the field of preparation of quartz crucibles, in particular to a grouting slurry for preparing high-strength quartz crucibles and a preparation method. Background technique [0002] The raw materials for quartz crucibles require high purity, good consistency, and uniform particle size distribution. When the harmful components are high, it will affect the melting of the crucible and affect its temperature resistance. There will also be phenomena such as bubbles, stains, and peeling. In severe cases, the quartz crucible will soften and leak silicon. For example: when the Al content is too high, it will affect the purity of the drawn single crystal silicon. When the content of Na, K, Li and other elements is high, the softening temperature of the quartz crucible will be lowered. When the content of Co, Mo, Fe and other elements is high Stains can develop. The high total content of harmful elements will also produce some defects ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/14C04B35/622
Inventor 胡潇勇胡忠毛潇萌屈林仪陈昌
Owner YICHANG KENNSUN SOLAR ENERGY MATERIAL SCI & TECH
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