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High-purity ultra-fine torispherical silicon micro-powder prepared from natural powder quartz ore and preparation method of silicon micro-powder

A spherical silicon micropowder and quartz technology, applied in the direction of silicon oxide, silicon dioxide, etc., can solve the problems of many impurities, low spheroidization rate, impurity of silicon micropowder products, etc., to achieve high purity, improve purity, easy to mass The effect of industrial production

Inactive Publication Date: 2011-07-13
HUNAN JINMA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microsilica powder product prepared by the existing method is impure, contains many impurities, and has a low spheroidization rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Firstly, the natural powder quartz ore is hand-selected to remove red, yellow, brown and other color impurities, and the powder quartz ore of 200-325 mesh is obtained through rough grinding, and 1kg of natural powder quartz ore of 200-325 mesh is weighed and added to the QHJM- 2. Add 0.54kg of dilute sulfuric acid (1mol / L) to the ultrafine mill to adjust the mass concentration of the pulp to 60%. Take 2kg of zirconia balls of Φ=1mm and 3kg of zirconia balls of Φ=2mm and add them to the ultrafine mill at the same time In the process, the rotation speed is 300r / min, the pH of the slurry is 3.0, and the grinding is 3h. Take the pulp to check the particle size. In the pulp, -2μm≥90%, add 10g (1% of the mass of the mineral powder) sodium dithionite, 5g (0.5% of the mass of the mineral powder) complexing agent, and grind for 30 minutes. Take out the ore pulp, then centrifuge it with TD5B desktop centrifuge, pour off the upper layer of acidic clear liquid, add water and repeat...

Embodiment 2

[0054] Pretreat the powdered quartz ore according to the steps of Example 1, also weigh 1 kg of natural powdered quartz ore of 200-325 mesh and join it in the QHJM-2 ultrafine mill, add 0.25 kg of dilute sulfuric acid (1mol / L) and 0.2 kg of dilute hydrochloric acid , adjust the mass concentration of the pulp to 65%, take 2kgΦ=1mm zirconia balls and 3kgΦ=2mm zirconia balls and add them to the ultrafine mill at the same time, the speed is 300r / min, the pH of the pulp is 2.5, and grind for 3h. Take a small amount of sample for measurement, if -2μm in the pulp is ≥ 90%, then add 10g sodium dithionite, 5g complexing agent, and grind for 30min. Take out the ore pulp, then centrifuge it with TD5B desktop centrifuge, pour off the upper layer of acidic clear liquid, add water and repeat centrifugal washing for 3-4 times until it is pure, and finally dry it to obtain high-purity ultra-fine "quasi-spherical" silicon micropowder. The prepared silicon micropowder was characterized and dete...

Embodiment 3

[0056] Change the above reaction conditions, add 0.56kg of dilute hydrochloric acid, do not add dilute sulfuric acid, adjust the mass concentration of the pulp to 60%, take 2kgΦ=1mm zirconia balls and 3kgΦ=2mm zirconia balls and add them to the ultrafine mill at the same time, The rotation speed is 300r / min, the pH of the pulp is 3.0, and the grinding is 2.5h. Take a small amount of sample for measurement, if -2 μm in the pulp is ≥ 90%, then add 15g (1.5% of the mass of the mineral powder) sodium dithionite, 5g (0.5% of the mass of the mineral powder) complexing agent, and grind for 30 minutes. Take out the ore pulp, then centrifuge it with TD5B desktop centrifuge, pour off the upper layer of acidic clear liquid, add water and repeat centrifugal washing for 3-4 times until it is pure, and finally dry it to obtain high-purity ultra-fine "quasi-spherical" silicon micropowder. The prepared silicon micropowder was characterized and determined by chemical and physical test analysis...

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Abstract

The invention discloses a high-purity ultra-fine torispherical silicon micro-powder prepared from natural powder quartz ore and a preparation method of the silicon micro-powder. The preparation method comprises the following steps: by taking the cheap natural quartz ore as a raw material, adding inorganic dilueted acid which exerts the grinding aid effect in an ultra-fine grinding machine so as to prepare ore slurry, and regulating the pH of the ore slurry to 2-3; by taking a zirconia ball as a ball-milling medium, grinding for 2-4 hours in the ultra-fine grinding machine; when the power of which the particle diameter is 2mu m reaches 60%-90% in the high-purity ultra-fine silicon powder, adding reductant sodium hydrosulfite and complexing agent oxalic acid, wherein the dosage of the reductant sodium hydrosulfite is 1-2% of weight of ore powder, and the dosage of the complexing agent oxalic acid is 0.5-1-5% of weight of ore powder; and after continuing to grind for a while, washing, filtering and drying. An ultrafine processing technology and a purification and bleaching technology are simultaneously achieved in the same equipment; and the preparation method has the advantages of simple process, short flow, low cost and obvious purification effect, and is easy to carry out large batch production on scale; and the product can be applied to the fields of electronics, electricians, optical fibers, lasers, aerospace and the like.

Description

technical field [0001] The invention belongs to the technical field of deep processing of non-metallic minerals, and relates to a high-purity ultrafine quasi-spherical silicon micropowder prepared from natural powder quartz ore and a preparation method thereof. Background technique [0002] Powder quartz ore is also known as silica, silica, soft silica, amorphous silica, similar to diatomaceous earth. It is naturally produced and contains extremely pure SiO 2 , Pure powdered microcrystalline quartz. Its chemical composition generally contains SiO 2 98%~99%, Al 2 o 3 0.13%~1%, Fe 2 o 3 0.03%~0.68%, TiO 2 0.01%~0.2%, CaO 0.05%~0.2%, MgO 0.01%, Na 2 O+K 2 O 0.01% ~ 0.44%, still contains a very small amount of impurities such as Mn, Pb, S, P, etc., and the loss on ignition is 0.14% ~ 0.31%. The natural fineness is generally less than 15 microns (about 800 mesh). There are two types of raw ores: powder (or soil) and block. The compressive strength of the powder (or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 李舟葛鹤松李浩蔡有兴
Owner HUNAN JINMA NEW MATERIAL TECH CO LTD
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