Method for processing 4N high-purity quartz by utilizing vein quartz as raw material

Abstract

The invention relates to a method for processing 4N high-purity quartz by utilizing vein quartz as a raw material. The method is characterized by taking HC1 as a pickling reagent, adopting secondary water quenching and pickling optimization processes and comprising the following steps: 1. grinding the raw material vein quartz until the grain size of powder is not greater than 30mm and then screening the powder into 5-30mm; 2. washing the material to remove sundries and the material containing impurities; 3. roasting the material at 1000 DEG C for 0.5-2 hours and then quickly quenching the material in distilled water at room temperature; 4. drying the material and grinding the dried material until the grain size is not greater than 40 meshes; 5. roasting the material at 650 DEG C for 1-3 hours and then quickly quenching the material in distilled water at room temperature; 6. drying the material and screening the dried material into 40-70 meshes, 70-140 meshes and not greater than 140 meshes; 7. pickling and purifying the material, wherein the process conditions are as follows: the acid concentration of the pickling reagent HC1 is 10-30%, the solid-to-liquid ratio is 1:2, the temperature is 60-150 DEG C and the time is 2-6 hours; 8. washing the material with ordinary distilled water twice and washing the material with purified water once to twice; and 9. drying the material, thus obtaining the 4N high-purity quartz with corresponding grain size. The method has the advantages of obvious effect, good safety, simple process, easiness for popularization and application, wide application range and obvious social and economic benefits.

Description

technical field [0001] The invention relates to a method for processing 4N high-purity quartz with vein quartz as raw material, using HCl as acid leaching reagent, secondary water quenching and acid leaching optimization process, and purification process w (SiO 2 )>4N (99.99%), w (Fe)<10×10 -6 , the particle sizes are -40 mesh, 40-70 mesh, 70-140 mesh and -140 mesh high-purity quartz, which is suitable for processing a kind of 4N high-purity quartz with vein quartz as raw material. Background technique [0002] 2.1 The concept of high purity quartz [0003] Quartz, chemical formula SiO 2 , is the general term for α-quartz (low-temperature quartz) and β-quartz (high-temperature quartz). When not specified, it often refers to α-quartz. Quartz is a hard, wear-resistant, chemically stable silicate mineral, usually milky white or colorless, translucent, hardness 7, brittle, no cleavage, shell-like fracture, grease luster, relative density 2.65, Its electrical, thermal...

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Problems solved by technology

(2) From the perspective of product variety, there is no serialized product production that meets various purity and particle size requirements

Second, the impurity content of crystals varies greatly across my country, and the product quality is unstable, making it difficult to realize the standardized supply of raw materials. However, the origin of quartz in the same mining area is basically the same, and the quality of the ore is relatively stable. It is a mineral raw material with high quality requirements. Standardized processing created the conditions

After searching, no one was found to use vein quartz as raw material, purified and processed w (SiO 2 )>4N, w (Fe)-6 , with particle sizes of -40 mesh, 40-70 mesh, 70-140 mesh and -140 mesh respectively, literature reports or patent applications of high-purity quartz

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