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Method for directly preparing high-purity white carbon black from fluorine-containing silicon slag

A technology of fluorine-containing silicon slag and white carbon black, applied in chemical instruments and methods, aluminum fluoride, silicon oxide, etc., can solve the problems of difficult to achieve product quality, difficult to achieve industrialization, complex white carbon black process, etc. Low, high yield, short and practical effect of process

Pending Publication Date: 2020-02-28
HUANGGANG NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of preparing white carbon black in the above-mentioned patents is complicated and requires a large investment. It is difficult to achieve industrialization and the quality of the product is difficult to meet the requirements of the national industry standards.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using fluorine-containing silicon slag as a by-product of aluminum fluoride produced by a company in Hubei as raw material, its technical indicators are:

[0024] SiO 2 : 60.3% (dry basis); NSA: 28m 2 / g.

[0025] 1. Deacidification, homogeneous beating and dispersing materials

[0026] The fluorine-containing silicon slag material separated by the vacuum belt filter is then deacidified by a centrifuge (or the fluorine-containing silicon slag separated from the vacuum belt filter can be directly sent to the homogeneous kettle), after deacidification Weigh containing H 2 SiF 6 300Kg of material with a liquid volume of 50% is sent to a 1000L homogeneous mixing tank and tap water is added for beating. The slurry concentration is controlled at 30%, and the stirring speed is controlled at 2000-2300r / min. After 300min, the sample is separated into pear-shaped liquid Observed in the funnel, a stable suspension was formed, and its pH=2 was measured with precision test pape...

Embodiment 2

[0032] Using fluorine-containing silicon slag as a by-product of aluminum fluoride produced by a company in Hubei as raw material, its technical indicators are:

[0033] SiO 2 : 55.8% (dry basis); NSA: 30m 2 / g.

[0034] 1. Deacidification, homogeneous beating and dispersion

[0035] Weigh 300Kg of the fluorine-containing silicon slag material separated by the vacuum belt filter (containing H 2 SiF 6 Liquid volume is 60%) in the homogeneous kettle, add tap water and carry out beating, slurry concentration is controlled at 25%, and stirring speed is controlled at 2500-2800r / min, and the time is 240min, and sampling is observed in the pear-shaped separating funnel, has formed Stable suspension, its pH=2 measured with precision test paper. Then dehydrate, then put the dehydrated material into a homogeneous kettle and add tap water to make the slurry concentration 20%, open the beater for beating for 60 minutes, take samples for observation, and form a stable suspension. The...

Embodiment 3

[0041] Using fluorine-containing silicon slag as a by-product of aluminum fluoride produced by a company in Hubei as raw material, its technical indicators are:

[0042] SiO 2 : 40.8% (dry basis); NSA: 21m 2 / g

[0043] 1. Centrifugal deacidification, homogeneous beating and dispersion

[0044] Weigh 300Kg of fluorine-containing silicon slag material after centrifugal deacidification (containing H 2 SiF 6 Liquid volume is 53%) put into the homogeneous kettle and add tap water to beating, the slurry concentration is controlled at 10%, the stirring speed is controlled at 3000-3200r / min, time 180min, then sampling is observed in the pear-shaped separating funnel, forms A stable suspension was obtained, and its pH=2 was measured with precision test paper. Then dehydrate, then put the dehydrated material into the homogeneous kettle, add tap water to make the slurry concentration 30%, turn on the beater, beat at the same speed for 45 minutes, and then set aside.

[0045] 2. So...

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Abstract

The invention relates to a method for directly preparing high-purity white carbon black from fluorine-containing silicon slag. The method comprises the following steps: homogenizing, pulping and dispersing fluorine-containing silicon slag to disperse aluminum hydroxide powder wrapped by solid white carbon black particles so that the dispersed aluminum hydroxide powder reacts with fluosilicic acidadsorbed by the solid white carbon black to produce a water-soluble aluminum fluoride solution and a solid silicon dioxide material, removing an acid liquor containing aluminum fluoride, and carryingout homogenizing pulping, dispersing and ultrasonic fine washing on the obtained solid silicon dioxide material at least one time until washing water is neutral, and dehydrating and drying the neutralsilicon dioxide material to obtain the high-quality white carbon black. The method is simple, practical and capable of achieving industrial production, the SiO2 content (by dry basis) of the preparedwhite carbon black is greater than or equal to 92%, NSA is greater than or equal to 200 g / m<2>, the particle size is smaller than or equal to 0.044 micrometers, and the total iron content is smallerthan or equal to 0.01%, and other technical indexes all meet or exceed the national industrial standard HG / T3061-2009 requirements of precipitated white carbon black.

Description

technical field [0001] The invention relates to a method for directly preparing high-purity white carbon black by using fluorine-containing silicon slag, and belongs to the technical field of deep processing of solid waste minerals and environmental protection. Background technique [0002] At present, the process route of producing aluminum fluoride using by-product fluosilicic acid is: use fluosilicic acid and aluminum hydroxide as raw materials, react at a temperature of 80-100°C, and use a vacuum belt filter to separate the water-soluble fluoride. Aluminum and produce solid white carbon black. Silica particles are porous, spherical in surface and have many hydroxyl groups on the surface, which has strong chemical adsorption. The preparation of aluminum fluoride with fluorosilicic acid is a conventional chemical reaction kettle, the stirring speed is low, the shear force is small, and the white carbon black generated during the synthesis process is easy to adsorb with al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18C01F7/50
CPCC01B33/186C01F7/50C01P2004/64C01P2006/12C01P2006/19C01P2006/80
Inventor 田辉明田正芳黄林勇陈中文江军民
Owner HUANGGANG NORMAL UNIV
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