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Efficient boron-removing slag former and preparation method thereof and method for removing boron and slagging

A kind of slagging agent and slagging technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, silicon dioxide, etc., can solve the problem of limited resources of high-purity quartz ore, unstable boron removal effect, quality problems, etc. Uneven problems, to achieve the effect of enriching the range of materials

Active Publication Date: 2014-09-03
福建上杭兴恒硅品有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] At present, the silicon dioxide in the traditional boron removal slagging agent mainly comes from high-purity quartz ore. The resources of high-purity quartz ore are limited, the quality is uneven, and the boron removal effect is unstable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1 prepares nano silicon dioxide

[0043] 1. Burn rice husk to produce rice husk ash, the burning temperature is 550°C, and the burning time is 5 hours;

[0044] 2. Add rice husk ash and 0.6mol / L NaOH solution into a stirred reactor, and heat and stir. The heating temperature is 105°C, and the reaction time is 5h. After the reaction is completed, filter the reaction materials to obtain a water glass solution. The ratio of described rice husk ash and NaOH solution is 1kg:15L;

[0045] 3. Add the above-mentioned water glass solution, 1mol / L hydrochloric acid, and 0.1mol / L oxalic acid into the reactor at the same time to heat at a metered feeding rate. The heating temperature is 60°C, and the pH value of the material is measured by regular sampling. The reaction time is 50min. During the reaction process, ensure that the pH value of the solution is 8 to 8.5, and the pH value at the end of the reaction is 7 to 8;

[0046] 4. Drop 1mol / L hydrochloric acid into th...

Embodiment 2

[0051] 1. Burn rice husk to produce rice husk ash, the burning temperature is 600°C, and the burning time is 6 hours;

[0052] 2. Add rice husk ash and 0.6mol / L NaOH solution into a stirred reactor, and heat and stir. The heating temperature is 110°C, and the reaction time is 4.5h. After the reaction is completed, filter the reaction materials to obtain a water glass solution , the ratio of the rice husk ash and NaOH solution is 1kg: 18L;

[0053] 3. Add the above-mentioned water glass solution, 1mol / L hydrochloric acid, and 0.1mol / L oxalic acid into the reactor at the same time to heat at a metered feeding rate. The heating temperature is 50°C, and the pH value of the material is measured by regular sampling. The reaction time is 50min. During the reaction process, ensure that the pH value of the solution is 8 to 8.5, and the pH value at the end of the reaction is 7 to 8;

[0054] 4. Drop 1mol / L hydrochloric acid into the solution obtained in step 3 for acidification, and wh...

Embodiment 3

[0058] Embodiment 3: prepare sodium carbonate

[0059] Sodium carbonate is ground into a powder with a particle size of 325-700 mesh, that is, 20-45 microns, by means of milling equipment.

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Abstract

The invention relates to the technical field of polysilicon purification, and particularly relates to an efficient boron-removing slag former and a preparation method thereof, and a method for removing boron and slagging. The boron-removing slag former comprises the following components: 40-60wt% of nanosilicon dioxide and 40-60wt% of sodium carbonate, preferably, 40-50wt% of nanosilicon dioxide and 50-60wt% of sodium carbonate, wherein the grain diameter of the nanosilicon dioxide is 50-130nm, preferably 60-120nm. By using common silicon dioxide, the proportion of a component B of a slag system is 4; by using the nanosilicon dioxide, the proportion of the component B is increased to 7-10. The nanosilicon dioxide is large in surface activity, high in boron-removing distribution coefficient, and significant in effect; the dosage of the slag former can be effectively reduced, the slagging time is shortened, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of polysilicon purification, in particular to a high-efficiency boron-removing slag-forming agent, a preparation method thereof and a boron-removing and slag-forming method. Background technique [0002] In today's background of increasing energy shortage and increasingly serious environmental pollution, solar photovoltaic power generation has become one of the most promising clean energy sources for large-scale application in the 21st century due to its mature technology, inexhaustible resources, and small environmental burden. It has attracted the attention of countries all over the world. Polysilicon is known as "the blood of modern industry, the cornerstone of the microelectronics information industry", and is the basic raw material and strategic material for the development of electronics and solar photovoltaic industries. [0003] At present, there are mainly chemical and metallurgical methods for the...

Claims

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Application Information

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IPC IPC(8): C01B33/037C01B33/18B82Y30/00B82Y40/00
Inventor 谢兴源杨凤炳李伟生龚炳生
Owner 福建上杭兴恒硅品有限责任公司
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