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Method for preparing white carbon black through waste silicon slag

A white carbon black and silicon slag technology, applied in the field of white carbon black preparation, can solve problems such as no research on the preparation of white carbon black, and achieve the effects of extensive and low-cost raw material sources, small number of equipment and small investment

Inactive Publication Date: 2016-01-27
GUIZHOU RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no research on the preparation of white carbon black using the above-mentioned waste materials as raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 30 g of waste silicon slag containing 90% silicon dioxide was placed in a 1000 mL reaction vessel. Get 139.86g of ammonium fluoride reagent (140% theoretical weight) and 1.793kg of distilled water to make an ammonium fluoride solution with a mass concentration of 7.8%, pour the prepared ammonium fluoride solution into the reactor, and stir and reflux in a water bath at 90°C , keep the slurry boiling until the silica dissolves, cool to room temperature, filter and wash. The filter cake after filtration is mainly unreacted waste silicon slag, which is collected and used as the initial reactant so that it can be recycled. The bubbling absorbs the volatilized ammonia gas, and after the ammonia gas is absorbed and cooled, the ammonia water can be used as the raw material for the next chemical reaction system. In addition, the mass concentration of the ammonium fluorosilicate solution obtained by filtering is controlled to 14.6%, and then pumped into the reaction kettle thro...

Embodiment 2

[0035] 30 g of waste silicon slag containing 90% silicon dioxide was placed in a 1000 mL reaction vessel. Get 149.85g of ammonium fluoride reagent (150% theoretical value weight) and 1.4985kg of distilled water to make an ammonium fluoride solution with a mass concentration of 10%, pour the prepared ammonium fluoride solution into the reactor, stir and reflux in a water bath at 110°C , keep the slurry boiling until the silica dissolves, cool to room temperature, filter and wash. The filter cake after filtration is mainly unreacted waste silicon slag, which is collected and used as the initial reactant so that it can be recycled. The bubbling absorbs the volatilized ammonia gas, and after the ammonia gas is absorbed and cooled, the ammonia water can be used as the raw material for the next chemical reaction system. In addition, the mass concentration of the ammonium fluorosilicate solution obtained by filtering is controlled to be 15%, and then it is pumped into the reaction k...

Embodiment 3

[0037]30 g of waste silicon slag containing 90% silicon dioxide was placed in a 1000 mL reaction vessel. Take 179.82g of ammonium fluoride reagent (180% theoretical weight) and 0.8325kg of distilled water to form an ammonium fluoride solution with a mass concentration of 21.6%, pour the prepared ammonium fluoride solution into the reactor, and stir and reflux in a water bath at 120°C , keep the slurry boiling until the silica dissolves, cool to room temperature, filter and wash. The filter cake after filtration is mainly unreacted waste silicon slag, which is collected and used as the initial reactant so that it can be recycled. The bubbling absorbs the volatilized ammonia gas, and after the ammonia gas is absorbed and cooled, the ammonia water can be used as the raw material for the next chemical reaction system. In addition, the mass concentration of the ammonium fluorosilicate solution obtained by filtering is controlled to 20.1%, and then injected into the reaction kettle...

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Abstract

The invention relates to a preparing method for white carbon black, and belongs to the field of inorganic chemistries. The preparing method is a method in which waste silicon slag serves as raw materials and is subjected to a series of chemical reactions to extract the white carbon black. The preparing method includes the steps that firstly, the waste silicon slag with silicon dioxide and ammonium fluoride is chemically reacted to generate ammonium fluosilicate and ammonia gas; secondly, the obtained ammonium fluosilicate and ammonium hydroxide are chemically reacted to generate silicon dioxide and ammonium fluoride; finally, the obtained silicon dioxide is aged, washed and dried, and the white carbon black is prepared. According to the preparing method for the white carbon black, the technological process is short, and the number of required devices is small; raw material sources are wide and cheap, and high-energy-consumption products such as water glass are not used; the method is low in investment and cost, high in product added value and free of environmental pollution.

Description

technical field [0001] The invention relates to a preparation method of white carbon black, which is a method for extracting white carbon black through a series of chemical reactions using waste silicon slag as a raw material, and belongs to the field of inorganic chemistry. Background technique [0002] White carbon black is a general term for fine powder or ultrafine particle anhydrous and hydrous silica or silicate, and is a white, non-toxic, amorphous fine powder. Its SiO 2 The content is relatively large (greater than 90%), and the original particle size is generally 10-40nm. Because the surface contains more hydroxyl groups, it is easy to absorb water and become aggregated fine particles. The relative density of white carbon black is 2.319-2.653g / cm 3 . The melting point is 1750°C. Insoluble in water and acid, soluble in strong alkali and hydrofluoric acid. It has excellent characteristics such as porosity, large internal surface area, high dispersion, light weigh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 田娟杨杰周昌平陈文兴陈思帆王瑶
Owner GUIZHOU RES INST OF CHEM IND
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