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Preparation method of silicon dioxide

A silicon dioxide and slag technology, which is applied in the field of silicon dioxide preparation, can solve problems such as the difficulty of finding silicon sources, and achieve the effects of environmental friendliness, reduced production costs, and high extraction content

Pending Publication Date: 2019-07-23
中塑新材料技术(吉林)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it is difficult to find a suitable silicon source

Method used

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  • Preparation method of silicon dioxide
  • Preparation method of silicon dioxide
  • Preparation method of silicon dioxide

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preparation example Construction

[0025] The invention provides a method for preparing silicon dioxide, comprising:

[0026] S1) mixing the slag with carbonate and reacting at high temperature to obtain a first intermediate product; the slag is slag containing silicon dioxide;

[0027] S2) After mixing the first product with an acid solution for acid leaching, filtering to obtain a filtrate;

[0028] S3) drying the filtrate to obtain a second intermediate product;

[0029] S4) Calcining the second intermediate product and washing it with acid to obtain silicon dioxide.

[0030] The present invention has no special limitation on the sources of all raw materials, which can be commercially available or self-made.

[0031] Wherein, the slag material is one or more of molybdenum slag, steel slag and furnace slag well known to those skilled in the art, and there is no special limitation. In the present invention, it is preferably molybdenum slag, blast furnace slag discarded from steelmaking, One or more of conve...

Embodiment 1

[0053] Using molybdenum slag as raw material, the composition of the molybdenum slag is shown in Table 1.

[0054] Table 1 Composition of molybdenum slag

[0055]

[0056] 1.1 Ball mill the molybdenum slag for 8 hours with a ball-to-material ratio of 10:1 and a speed of 400 rpm to obtain raw materials with a particle size of less than 200 mesh.

[0057] 1.2 Grind and mix 4.5g of the raw material obtained in 1.1 with 4.5g of anhydrous sodium carbonate, place in a muffle furnace at 800°C for 2h at high temperature, and obtain 5.2g of a light green solid.

[0058] 1.3 Mix the light green solid obtained in 1.2 with 60ml of 3mol / L hydrochloric acid for acid leaching. The acid leaching is carried out under magnetic stirring at a stirring speed of 500rpm. After 3 hours, add 30ml of water, then add acid to adjust the pH value to less than 3, and filter with suction , to obtain gray filter residue and light yellow filtrate (main component H 4 SiO 4 , AlCl 3 , FeCl 3 , containin...

Embodiment 2

[0066] Prepare according to the method of Example 1, the difference is that the raw material after 2g ball milling is ground and mixed with 2.4g anhydrous sodium carbonate, the mass ratio of raw material and anhydrous sodium carbonate is 1: 1.2, finally obtains 0.42g silicon dioxide, purity More than 93%, the yield is 31.3%.

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Abstract

The invention provides a preparation method of silicon dioxide, including the following steps: S1) mixing slag material with carbonate and carrying out high-temperature reaction to obtain a first intermediate product, wherein the slag material contains silica; S2) mixing the first product with an acid solution for acid leaching and then filtering to obtain filtrate; S3) drying the filtrate to obtain a second intermediate product; and S4) calcining and pickling the second intermediate product to obtain silica. Compared with the prior art, the preparation method has the advantages of taking theslag material containing silica as the raw material and preparing silica with high purity through carbonate activation, acid leaching and calcination, is simple and environmentally friendly, has highextract content, and reduces the production cost by taking extracted silica to prepare a novel silicon-based negative electrode material of an lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for preparing silicon dioxide. Background technique [0002] With high energy density, long cycle life and low self-discharge rate, lithium-ion batteries are widely used in smartphones, laptop computers, electric vehicles, etc., and have become a hot spot of scientific research. With the development of human society, people have higher requirements for commercial lithium-ion batteries, which require higher energy density, specific capacity and service life. At the same time, they need a wide range of materials, cheap prices, and safety and reliability. At present, the anode materials used in commercialized lithium-ion secondary batteries are mainly graphite-like carbon materials. However, the theoretical capacity of graphite is low (372mAh / g), and it is prone to lithium precipitation during the rapid lithium intercalation process, which has poor safety and...

Claims

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Application Information

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IPC IPC(8): C01B33/12H01M4/485H01M10/0525
CPCC01B33/12H01M4/485H01M10/0525C01P2002/72C01P2006/80Y02E60/10
Inventor 周文李明权杨化滨耿丽媛张兆翔
Owner 中塑新材料技术(吉林)有限公司
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