Method for preparing TFT-LCD silicon micro powder through vein quartz tailings

Abstract

The invention discloses a method for preparing TFT-LCD silicon micro powder through vein quartz tailings. The method comprises the steps of S1, preparing pulp, wherein the quartz tailings are sent into a pulp preparing bucket, and an anion-cation mixed collecting agent and industrial grade H2SO4 are added into the pulp preparing bucket to prepare the pulp; S2, conducting flotation, wherein impurity minerals which floats in the form of foams are removed; S3, agent removing, wherein agent water in mortar after flotation is removed through a screw sand washer; S4, washing, wherein water is added into the mortar after agent removing to be cleaned; S5, dehydrating; S6, drying; S7, magnetic separation, wherein ferromagnetic minerals are further removed; S8, ball grinding and classification, wherein fine sand after treatment in the step S7 is sent into a non-mineral ball grinding machine for mineral grinding, meanwhile, two classifiers are adopted in sequence for classification, coarse sand which is classified by the first classifier and is bigger than 74 micrometers in particle size is returned to the non-mineral ball grinding machine for secondary mineral grinding, fine sand which is classified by the second classifier and is smaller than 45 micrometers in particle size is cut off, and therefore the TFT-LCD silicon micro powder of which the particle size is 45-74 micrometers is obtained.

Description

technical field [0001] The invention relates to the technical field of deep processing of non-metallic minerals, in particular to a method for preparing TFT-LCD silicon micropowder by utilizing vein quartz tailings. Background technique [0002] TFT-LCD is currently the mainstream in the field of liquid crystal flat panel display, and it is an industry supported by the state. Liquid crystal glass substrate is the basic raw material of TFT-LCD, and its performance has an important impact on the industry. In TFT glass substrates, SiO 2 It is the most important structural element (accounting for 58-63%), which can reduce the thermal expansion coefficient of glass and improve the thermal stability, chemical stability and mechanical strength of glass. Introducing SiO 2 The most important is the raw material of quartz powder, and its basic requirements include two aspects: chemical composition and particle size control. The current domestic market demand is about 50,000-100,00...

AI Technical Summary

Problems solved by technology

The tailings contain high impurities such as Al, Fe, Ca, K, Na, etc., and the particle size distribution is unreasonable, so it is difficult to be effectively used. Most factories only carry out simple storage and sell them at a low price, which restricts the environment while affecting the environment. Sustainable Development of Enterprises

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