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Method for preparing ultrafine alumina and coproducing and white carbon black by utilizing coal series kaolin

A technology of ultra-fine alumina and white carbon black, applied in the direction of alumina/aluminum hydroxide, silicon oxide, silicon dioxide, etc., can solve the problem of low comprehensive utilization of high energy consumption resources, non-recyclable by-products, comprehensive utilization of resources Low-level problems, to achieve the effect of high comprehensive utilization rate, high product added value, and uniform particles

Inactive Publication Date: 2013-05-29
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology involves methods for producing finer or more pure materials from natural sources such as clay mineral called peat moss. These processes require less expensive facilities than traditional chemical techniques like caustic cleaners used during production. Additionally, these products can be easily recovered and reuse without harmful side effects.

Problems solved by technology

This patented technology describes various ways to extract valuable chemical components like alkaline earth metals called talc from coal samples containing calcium oxide. These processes involve acid treatment followed by extraction steps involving separation of iron, titanium, manganese, magnesia, lanthanoid gamma tritrite, and other similar compounds found naturally occurring throughout the world. However, these techniques have limitations due to their impact upon both natural environments and human health concerns. Therefore, there needs an improved way to make highly valued industrial applications based solely on specific types of sources without harmful effects caused by traditional treatments used alone.

Method used

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  • Method for preparing ultrafine alumina and coproducing and white carbon black by utilizing coal series kaolin
  • Method for preparing ultrafine alumina and coproducing and white carbon black by utilizing coal series kaolin

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Alumina, silica, and loss on ignition account for 40.08%, 37.65%, and 17.32% of the coal-based kaolin used in this example, respectively.

[0048] Weigh 50 grams of coal-series kaolin, crush the coal-series kaolin into powder, and then roast and activate it. After the roasted powder is cooled naturally, it is placed in a leacher, and the mass fraction is 25% dilute caustic soda in Reaction at 80°C for 30 minutes, the total amount of caustic soda is based on Na 2 O: SiO 2 =1.0 molar ratio calculation, after the reaction is completed, filter to obtain sodium silicate solution and alkali leaching residue. Add sodium hexametaphosphate to the sodium silicate solution, the quality of sodium hexametaphosphate is 0.5% of the quality of the sodium silicate solution, feed carbon dioxide gas for carbonation treatment, when the pH of the solution is 4, the carbonation reaction ends, filter , to obtain the ortho silicic acid precipitation filter cake and desiliconization solution,...

Embodiment 2

[0053] In the coal series kaolin used in this example, alumina, silica, and loss on ignition accounted for 37.36%, 42.79%, and 15.60%, respectively.

[0054] Weigh 50 grams of coal-series kaolin, crush the coal-series kaolin into powder, and then roast and activate it. After the roasted powder is cooled naturally, it is placed in a leacher, and the mass fraction is 5% dilute caustic soda in React at 100°C for 90 minutes, and the total amount of caustic soda is based on Na 2 O: SiO 2 =1.2 molar ratio calculation, after the reaction is completed, filter to obtain sodium silicate solution and alkali leaching residue. Add polyethylene glycol as a dispersant to the sodium silicate solution, the quality of polyethylene glycol is 5% of the mass of the sodium silicate solution, carbon dioxide gas is passed into it for carbonation treatment, and the carbonation reaction ends when the pH of the solution is 7 , filtered to obtain ortho silicic acid precipitation filter cake and desilic...

Embodiment 3

[0059] Alumina, silica, and loss on ignition accounted for 40.08%, 37.65%, and 17.32% of the coal-based kaolin used in this example, respectively.

[0060] Weigh 50 grams of coal-series kaolin, crush the coal-series kaolin into 200-mesh powder, and then calcinate at 960°C for 60 minutes to activate the roasting. The roasted powder is naturally cooled and placed in a leaching device , react with a mass fraction of 15% caustic soda solution at 95°C for 60 minutes, and the total amount of caustic soda is based on Na 2 O: SiO 2 =1.2 molar ratio calculation, after the reaction, SiO 2 The detachment rate is 86.33%. After filtration, sodium silicate solution and alkali leaching residue are obtained. Add composite dispersant in sodium silicate liquid, the amount of composite dispersant is 1% of the quality of sodium silicate solution, composite dispersant is made up of sodium hexametaphosphate and polyethylene glycol by the mass ratio of 1: 1, then 80 Carbon dioxide gas with a conc...

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Abstract

The invention belongs to the field of the comprehensive utilization of coal series kaolin, and in particular relates to a method for preparation of ultrafine alumina and white carbon black through an alkaline method by utilizing coal-based kaolin. The method comprises the following steps: carrying out crushing, roasting, alkaline leaching and filtration on the coal series kaolin, thereby obtaining a sodium silicate solution and alkali leaching residues; carrying out carbonatation treatment on the sodium silicate solution, thereby obtaining an orthosilicic acid precipitate filter cake and a desilicication solution; aging and roasting the orthosilicic acid precipitate filter cake, thereby obtaining the white carbon black; treating the alkali leaching residues by utilizing a soda-lime sintering process; carrying out self-pulverization, water quenching and filtration on the sintered clinker aggregates, thereby obtaining a NaAlO2 solution; carrying out the carbonation treatment on the NaAlO2 solution; and finally roasting the carbonated NaAlO2 solution, thereby obtaining the ultrafine alumina. According to the production method, the requirement to equipment is low; and all byproducts are recycled, so that the zero discharge is realized and the energy consumption is low. Thus, the method is economic and environment-friendly. In addition, the comprehensive utilization rate of resources and the additional value of the product are high.

Description

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Claims

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Application Information

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Owner CHINA UNIV OF MINING & TECH (BEIJING)
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