Purification method of high purity quartz sand tailings

Abstract

The invention provides a purification method of high purity quartz sand tailings. The method includes: ore grinding: taking the tailings generated in the high purity quartz sand production process asthe raw material, and carrying out ball milling and sieving; strong magnetic separation: performing strong magnetic separation by a magnetic separator to remove strong magnetic substances in the quartz sand; acid leaching: performing acid leaching treatment, then conducting filtering and ultrapure water flushing; calcination: conducting high temperature calcination for 2-4h; water quenching: performing water quenching for 3-5min to break the junction of a quartz matrix and impurities; secondary acid leaching: repeating the above acid leaching process to remove feldspar and other impurities inthe quartz sand; and cleaning: conducting flushing with ultrapure water, and performing filtering and drying to obtain a purified and processed product of quartz sand tailings. The method provided bythe invention adopts mixed acid to cooperate a leaching aid to replace the traditional acid leaching process, improves the leaching rate of quartz sand, and reduces the dosage of acid in the acid leaching process. The quartz sand tailings treated by the technology have a silica content up to 99.9% or above, which reaches the standard of high-purity quartz sand.

Description

technical field [0001] The invention relates to the field of inorganic material processing, more specifically, the invention relates to a processing technology for purifying high-purity quartz sand tailings. Background technique [0002] Quartz sand, also known as silica sand, is a common non-metallic mineral raw material. It is widely used in construction industry, glass manufacturing, ceramic industry and foundry industry. The main mineral of quartz sand is quartz, followed by Feldspar, mica, clay minerals, etc. Quartz sand tailings include waste slag in ore mining, tailings and tailings in processing, of which tailings account for the majority. Quartz sand tailings in my country generally have higher grades, especially the tailings left over from production in the 1950s and 1960s, but the presence of impurities in them has greatly reduced the quality of quartz sand raw ore, so the refining of quartz sand tailings It is very important to improve the purity of the product,...

AI Technical Summary

Problems solved by technology

The physical methods are mainly water washing and graded desliming, scrubbing, magnetic separation, flotation and ultrasonic methods. The commonly used chemical methods are mainly acid leaching and complexation methods. The commonly used physical methods to purify quartz sand are not only complicated in process, but also the content of impurities remains very high

The acids commonly used in traditional quartz sand acid treatment include sulfuric acid, hydrochloric acid, nitric acid and other strong acids. Although the acid treatment method has a very good effect on the removal of metal impurity minerals in quartz sand, the waste acid solution after refining has a great impact on the environment. Treatment Therefore, it is necessary to study a purification method of quartz sand tailings that is environmentally friendly and has a good purification effect

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