Method for producing high-purity quartz sand

Abstract

The invention discloses a method for producing high-purity quartz sand. The method comprises the following steps: magnetic separation, floatation separation, staged de-sliming, acid-leaching washing, drying and finished product obtaining. Through magnetic separation, garnet, hematite, limonite, ilmenite and coenobium particles thereof are removed. Mica and Fe2 in the quartz are removed through floatation separation. Through adding a dispersant for scrubbing, electric repulsion on the surfaces of impurity minerals and quartz particles is increased, and the effect of separating the impurity minerals from the quartz particles is enhanced. In particular, through double acid leaching and double washing, film iron on the surfaces of silica sand particles and iron minerals or iron-containing minerals accompanying in the quartz sand are separated through the function of acid in dissolving iron and other harmful elements. The high-purity quartz sand is produced through the strict technical steps.

Description

technical field [0001] The present invention belongs to the deep processing technology of quartz sand, and in particular relates to a production method of high-purity quartz sand. Background technique [0002] Quartz sand, also known as silica sand, is a common non-metallic mineral raw material with a wide range of applications. my country's quartz sand beneficiation, purification and deep processing development and utilization are relatively late, and are mainly used in the construction industry, glass manufacturing, ceramic industry and foundry industry. A common feature of these fields is that the demand for quartz sand is large and the quality of raw materials is low. For the high-quality quartz sand produced in some places in my country, it can basically meet the demand for industrial sand without ore beneficiation or slight purification. [0003] At present, the United States is the most advanced technology for mineral processing and purification of quartz sand in for...

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Problems solved by technology

Two patent documents related to the subject matter of the present invention are found after retrieval, but the production methods in these patent documents all have complex processes and high production costs, such as the production method of high-purity quartz sand whose publication number is CN 102887516 A, although The produced quartz sand has high purity, but the two-time firing process requires high technical requirements, which is difficult for ordinary enterprises to achieve.