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Method for extracting aluminum oxide and silicon oxide from solid coal wastes

A solid waste and alumina technology, which is applied in solid waste removal, alumina/aluminum hydroxide, silica, etc., can solve the problems of difficult separation of aluminum and silicon, poor quality of alumina products, and high energy consumption

Active Publication Date: 2015-07-22
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the existing coal-based solid wastes such as fly ash and coal gangue to extract alumina, and to provide a process that adopts sulfuric acid conversion-high temperature reduction-two-stage alkali leaching Alumina is extracted from gangue and other coal-based solid wastes. Specifically, aluminum minerals and silicon minerals in minerals are dissociated through sulfuric acid conversion, and aluminum sulfate decomposition and sulfuric acid regeneration cycles are realized through high-temperature reduction. At the same time, alumina and di Alkali leaching activity of silicon oxide, and then through low-temperature alkali leaching silicon and high-temperature alkali leaching aluminum, respectively, to realize the leaching of silicon and aluminum, which not only avoids the poor quality of alumina products produced by the acid method, the concentration of aluminum salt crystallization and the The problem of high energy consumption for dehydration has also overcome the problems of difficult separation of aluminum and silicon, large sintering capacity, high energy consumption, and large amount of red mud in the production of alumina by the alkaline process, and realized the complementary advantages of the acid process and the alkaline process

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  • Method for extracting aluminum oxide and silicon oxide from solid coal wastes

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Effect test

Embodiment 1

[0030] The fly ash containing 48% of alumina and 42% of silicon dioxide is mixed with sulfuric acid, and the amount of sulfuric acid added is Al in the fly ash 2 o 3 3.5 times the number of moles, and the mass concentration of sulfuric acid used is 90%. After mixing evenly, acidolysis and solidification are carried out at 250°C for a reaction time of 2 hours. Add coal powder with a fixed carbon content of 70% and mix evenly, then reduce and roast at a temperature of 1000°C for 5 minutes, and the produced reduced calcined sand is made of Na 2 Sodium hydroxide solution with an O concentration of 100g / L is leached, the mass-to-volume ratio of the leached solid to liquid is 1:10, the leaching temperature is 85°C, and the leaching time is 60 minutes. After filtering, the leaching solution containing silicon and high-alumina slag are obtained. The leaching rate of silicon is 75%. The silicon leaching solution is used to produce white carbon black; the obtained high alumina slag is ...

Embodiment 2

[0032] The fly ash containing 48% of alumina and 42% of silicon dioxide is mixed with sulfuric acid, and the amount of sulfuric acid added is Al in the fly ash 2 o 3 4.5 times the number of moles, and the mass concentration of sulfuric acid used is 95%. After mixing evenly, acidolysis and solidification are carried out at 300°C for a reaction time of 2 hours. Add coal powder with a fixed carbon content of 70% and mix evenly, then reduce and roast at a temperature of 950°C for 30 minutes, and the produced reduced calcined sand is made of Na 2 Sodium hydroxide solution with an O concentration of 50g / L is leached, the mass-to-volume ratio of leaching solid to liquid is 1:5, the leaching temperature is 85°C, and the leaching time is 60 minutes. After filtering, silicon-containing leaching solution and high-alumina slag are obtained. The leaching rate of silicon is 55%. The silicon leaching solution is used to produce white carbon black; the obtained high alumina slag is used for ...

Embodiment 3

[0034] Grind coal gangue containing 38% of alumina and 48% of silicon dioxide to 0.1mm and mix it with sulfuric acid. The amount of sulfuric acid added is the amount of Al in the fly ash 2 o 3 3.5 times the number of moles, the mass concentration of sulfuric acid used is 95%, after mixing evenly, acidolysis and solidification are carried out at 300°C, the reaction time is 2h, and then the coal gangue powder after acid hydrolysis is added according to 10% of the mass of coal gangue The coal powder with a fixed carbon content of 70% is mixed evenly, and then reduced and roasted at a temperature of 1100 ° C for 3 minutes, and the reduced calcined sand produced is Na 2 Sodium hydroxide solution with an O concentration of 100g / L is leached, the mass-to-volume ratio of the leached solid to liquid is 1:10, the leaching temperature is 85°C, and the leaching time is 60 minutes. After filtering, the leaching solution containing silicon and high-alumina slag are obtained. The leaching ra...

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Abstract

The invention discloses a method for extracting aluminum oxide and silicon oxide from solid coal wastes. The method comprises the following steps: uniformly mixing pulverized coal ash or colliery powder with a certain amount of concentrated sulfuric acid; performing acidolysis and solidification under the temperature of 120-500 DEG C; performing quick reduction roasting on the solidified mixture and a proper number of reductive agents, such as pulverized coal, colliery powder, coal gas or sulphur, under the temperature of 900-1200 DEG C; leaching silicon from reduced calcine under the conditions of low temperature and low alkali, leaching aluminum under the conditions of high temperature and high alkali, wherein the leaching liquid containing silicon can be used for producing white carbon black or activated calcium silicate; performing purification, seed separation and calcination on the leaching liquid containing aluminum so as to produce the aluminum oxide. According to the method disclosed by the invention, through the utilization of the high-temperature reaction of concentrated sulfuric acid, the decomposition of aluminosilicate minerals in the pulverized coal ash and coal gangues is strengthened; then, through the high-temperature quick reduction roasting, the desulfuration of aluminum sulfate is realized, and the alkali leaching activity of silicon dioxide is improved, so that silicon and aluminum can be leached separately.

Description

technical field [0001] The present invention belongs to the comprehensive utilization of coal-based solid waste, and in particular relates to a method for extracting alumina and silicon oxide from coal-based solid waste such as fly ash and coal gangue, especially through sulfuric acid conversion of coal-based solid waste, High-temperature reduction, alkali leaching, and extraction of alumina and silica from coal-based solid waste. Background technique [0002] Coal-based solid waste mainly refers to coal gangue, fly ash, etc. produced during coal mining and utilization. The main components of this type of solid waste are alumina and silica. Due to the lack of clean and economical utilization solutions, currently A small amount of ash is used in the production of building materials, and most of it is stockpiled. The efficient and economical extraction of useful components from this type of solid waste can not only solve the problem of ecological environmental pollution caused...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01B33/12C01B33/24B09B3/00
Inventor 蒋训雄蒋开喜范艳青李达汪胜东张登高冯林永蒋伟刘巍靳冉公周立杰
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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