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Method for deeply removing aluminium from industrial high-silica sand

A kind of quartz sand, industrial pure technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of quartz sand loss, high impurity removal rate, and achieve the effect of saving dosage, good effect and reducing acidity

Inactive Publication Date: 2008-05-14
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because hydrofluoric acid can react with silica, the main component of quartz sand, resulting in the loss of quartz sand
Therefore, the main disadvantage of this type of method is that the impurity removal process will damage the target mineral silica, but because hydrofluoric acid can completely destroy the silica lattice structure that hinders the removal of impurity aluminum, the impurity removal rate is usually higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: (preferred)

[0017] In a reaction kettle with mechanical stirring, the temperature is 80°C, and the weight ratio of hydrochloric acid solution:quartz sand is 1:1. In 15% single hydrochloric acid solution, the leaching rate reaches a maximum value of 45% after 5 hours of reaction. That is to say, the leached quartz sand contains aluminum (21.4ppm), which is slightly better than the 22.7ppm level of Unimin Corporation of the United States.

Embodiment 3

[0018] Embodiment 3: (preferred)

[0019] At the bottom (outside) of the reaction kettle, use ultrasonic stirring, ultrasonic frequency 40kHz, power 360W, temperature 80°C, mix 1.0% hydrochloric acid and 0.5% oxalic acid mixed acid solution in a weight ratio of 99.5 / 0.5, add an equal weight of quartz The sand is in the mixed acid solution, and the leaching rate reaches 53% after 1 hour of reaction. The leached quartz sand contains aluminum (17.4ppm), exceeding the level of 22.7ppm of Unimin Corporation of the United States. And the amount of acid used for leaching is greatly reduced, and the time spent is only 20% of that of the mechanical stirring in Example 1.

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PUM

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Abstract

The invention relates to a method for deeply removing aluminum impurity from arenaceous quartz. 15 to 20 percent of homogeneous chlorhydric acid is used for replacing mixed acid formed with chlorhydric acid and sulphuric acid, the weight ratio of the chlorhydric acid and the arenaceous quartz is 1: 1; when the temperature is 80 to 90 DEG C, mechanical agitation is used for leaching technically pure arenaceous quartz for at least 5 hours, or mixed acid formed with 0.4 to 0.6 percent of oxalic acid and 1.0 to 4.5 percent of chlorhydric acid is used for removing aluminum in the arenaceous quartz, the mixed weight ratio of the oxalic acid and the chlorhydric acid is 0.5: 99.5, the weight ratio of the mixed acid and the arenaceous quartz is 1: 1; and ultrasonic agitation is performed for at least one hour. By utilizing the method, the aluminum impurity in the technically pure arenaceous quartz can be removed to below 20 PPm which exceed the universally accepted standard of high quality arenaceous quartz of the American Unimin Corporation, and an extremely small amount of weak acid (oxalic acid) replaces the commonly used industrial strong acid (sulphuric acid), thereby greatly reducing the harm to the environment, and being favorable for the environmental protection.

Description

technical field [0001] The invention relates to a method for deeply removing impurity aluminum from quartz sand, in particular to a method that is simple, easy to implement, friendly to the environment and may be implemented on a large scale in the industry to further remove aluminum from industrial pure quartz sand. Impurity aluminum, making it reach the world-recognized high-quality quartz sand standard. Background technique [0002] High-purity quartz sand with impurity content in ppm level is an important industrial raw material. It is widely used in high-tech fields such as computers, optical fiber, semiconductor materials, aerospace, and atomic energy technology. However, because these high-tech fields have high requirements for quartz raw materials, and our country lacks natural high-purity quartz resources, we have to import 5,000-8,000 tons per year to meet the urgent needs, and the increase is increasing year by year. Therefore, seeking an efficient and environme...

Claims

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Application Information

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IPC IPC(8): C01B33/12C01B33/18
Inventor 李敬生沈琴
Owner JIANGSU UNIV
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