Fluoride-free low-acid zwitterion quartz sand reverse flotation process

Abstract

The invention relates to fluoride-free low-acid zwitterion quartz sand reverse flotation process, which is characterized by comprising following steps: (1) pretreatment; (2) flotation: adjusting the pH (potential of hydrogen) value of ore pulp to 4-5 by sulfuric acid, performing air agitation, adding 40g / t-80g / t of positive ion collecting agent and 60g / t-75g / t of foaming agent, stirring and removing foams in primary flotation; and adjusting the pH value of the ore pulp to 9-10 by 200g / t-300g / t of sodium carbonate, performing air agitation, adding 80g / t-150g / t of negative ion collecting agent,then adding 60g / t-75g / t of foaming agent, stirring and removing foams in secondary floatation; and (3) washing ores in a flotation tank by water until the ores are neutral, and drying the ores to obtain quartz sand concentrates. The flotation collecting agents are fine in selectivity, the process is simple, cost is low, the purity of the quartz sand is high, the content of iron and aluminum impurities is low, and the problem that traditional fluoride and high-acid process damages equipment and environments is avoided in a flotation process.

Description

[0001] technical field [0002] The invention belongs to the field of non-metallic mineral processing, and in particular relates to a fluorine-free, low-acid anion and cation reverse flotation process for quartz sand, which reduces the iron-aluminum metal impurity minerals contained in the quartz sand and prepares refined quartz sand. Background technique [0003] With the strong demand for global strategic low-carbon energy-saving technologies, the research and development of new energy and new materials represented by solar energy urgently needs high-purity quartz as a basic material. High-purity quartz is a functional material with a wide range of uses, such as solar crystalline silicon cells, quartz crucibles, integrated circuit boards, electronic packaging materials, optical fibers, liquid crystal displays, lasers, silicon ingots, silicon rods, silicon wafers, and monocrystalline silicon , polysilicon, aerospace (video screen windows, rocket nozzles, etc.), national def...

AI Technical Summary

Problems solved by technology

The activator and pH regulator used in the hydrofluoric acid method are hydrofluoric acid. Although the selectivity is good, the fluoride ion treatment and secondary pollution problems in the later stage are difficult to solve; the biggest advantage of the sulfuric acid flotation process is that it avoids the use of Fluoride ion, which has a destructive effect on the environment, has a stable production index, but the strong acid can not be ignored on the beneficiation equipment and corrosion, and has higher requirements on the flotation equipment

The fluorine-free and acid-free method is to carry out flotation with anion and cation collectors at natural pH value, and realize green production. However, the purpose of mineral separation can only be achieved under the condition of strict control of pretreatment. If the pretreatment control is not good , the flotation index fluctuates greatly, and the existing fluorine-free and acid-free flotation methods have problems such as poor sorting performance, large dosage of chemicals, and high production costs.