Method of producing quartz powder for glass by taking iron tailings as raw material

Abstract

The invention discloses a method of producing quartz powder for glass by taking iron tailings as a raw material. The method comprises the following steps: reducing iron of the iron tailings by magnetic separation operations twice; then after hydrocyclone grading, sieving to remove impurity, floatation, tempering and harvesting successively, carrying out a reverse flotation process, a strong magnetic selection and pickling to obtain a primary quartz powder semiproduct; shaping and ball-milling the primary quartz powder semiproduct as an intermediate raw material; and adding superfine silica powder as a modifier to dry-mixing twice to obtain a quartz powder product for producing glass, wherein the grade of silicon dioxide of the superfine silica powder is greater than 96%. According to the method disclosed by the invention, the iron tailings low in grade and high in impurity content are effectively utilized as the raw material to prepare quartz powder as a glass raw material which is relatively excellent in flowability and dispersibility and unlikely to agglomerate in the smelting process, so that on the one hand, resources can be utilized effectively, and on the other hand, the obtained quartz powder can be applied to actual production process effectively.

Description

technical field [0001] The invention relates to the technical fields of tailings treatment and quartz powder processing, in particular to a method for producing quartz powder for glass by using iron tailings as a raw material. Background technique [0002] Quartz powder, also known as silica powder, is a hard, wear-resistant, chemically stable silicate mineral, and its main mineral component is SiO 2 , the color of quartz sand is milky white, or colorless and translucent, hardness 7, brittle without cleavage, with oily luster, its chemical, thermal and mechanical properties have obvious anisotropy, insoluble in acid, slightly soluble in KOH The solution has a melting point of 1650°C. Its low-grade finished products can be used to produce silica sand, quartz refractory materials and fired ferrosilicon, while high-grade finished products can be used to manufacture precision instrument bearings, abrasive materials, glass, ceramics and other products. In the prior art, the prod...

AI Technical Summary

Problems solved by technology

[0003] In the field of iron and steel smelting, due to the limitation of beneficiation technology and equipment or the restriction of beneficiation process, the recovery rate of beneficiation is low, resulting in a large amount of useful components remaining in the tailings, and the associated relationship between iron and quartz in nature makes the process SiO in iron tailings after iron production 2 The content is generally above 60%; in addition, in the process of purification of iron tailings by traditional technology, only the iron in it is usually recovered. If the iron in iron tailings is recovered, it will inevitably lead to the recovery of iron The secondary tailings contain more silicon substances, so that these iron tailings are basically only used to produce bricks or other building materials in the traditional process, and the added value of the products is low, which also leads to the comprehensive utilization of iron tailings. low condition

Based on the above reasons, many companies have developed processes for extracting and preparing quartz powder from iron tailings or secondary iron tailings. These processes are usually rough and costly, and the finished quartz powder produced can be used, but Only the indicators of grade and chemical composition are considered, and problems such as shape, powder fineness consistency, and powder dispersibility are not considered, which leads to problems in the bulk density, fluidity, and dispersibility of the powder, which makes it easy to produce in the later stage. In industrial applications, it is not as good as mineral quartz powder