Status development of high purity quartz sand at home abroad

High-purity ultra-fine quartz powder is useful in many fields, the following small series together to understand it. High purity quartz sand at home abroad upstream downstream development

(1) purification modification of high purity quartz sand

In terms of green production development of quartz sand, in order to meet the requirements of environmental protection, high temperature vacuum treatment technology, chlorination calcination technology new reagent technology of flotation neutral flotation can be demonstrated in the preparation of high purity quartz sand. In addition, in quartz sand iron removal, the current magnetic separation iron removal equipment to large-scale high magnetic field development; More tend to fine, automation. One of the gravity magnetic pull (cylinder type) magnetic separator separation with automatic dredging function of inclined long hole feeding device is the key.

Purification iron removal of quartz material is the key to prepare high purity quartz sand, the modification of quartz sand is the key to achieve large-scale application. Unmodified quartz used as resin filler, poor dispersion is easy to produce agglomeration, poor fluidity, affect the processing performance; Poor affinity with resin affects mechanical properties of products. Silane with double functional groups is an ideal modifier for quartz in the future. In the process of quartz modification, the hydrolysis of silane the adjustment of quartz surface properties are the core of the modification, the modification technological conditions are the key of the modification. Modification equipment is an important means to obtain ideal modified products.

(2) High-purity quartz sand grinding testing

At present, the market demand for high-purity ultra-fine quartz powder is increasing, the purity is becoming higher higher, the particle size is becoming finer finer, the particle shape is becoming more more spherical, the particle size distribution is becoming narrower narrower. This requires the production of high-purity ultra-fine quartz powder, according to the characteristics of their own raw materials market demand development trend, appropriate increase of different types of ultra-fine grinding grading equipment. Including the production of 100nm - 200nm ultra-fine grinding equipment, to meet the needs of market demand development.

(three) the application technology of high purity quartz sand

In the traditional field, high purity quartz sand is widely used in refractory amorphous refractory castable, which can improve the high temperature resistance durability of amorphous refractory. In the field of high-tech industry, quartz material can realize the transmission of aircraft communication, detection, guidance other signals, as well as provide the integrated material of heat protection, heat insulation, wave permeability load bearing for breaking through the aerodynamic heating under ultra-high sound speed. At present, fused quartz ceramics, quartz fiber reinforced quartz ceramics, carbon fiber reinforced quartz ceramics, quartz fiber insulation materials other materials are mainly applied to radome/window, heat shield/tile, ablative cap, air rudder leading edge other products.

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