Method for extracting aluminum oxide and white carbon black through two-step alkaline leaching method by adopting high-alumina fly ash

A high-alumina fly ash and alumina technology, applied in the direction of alumina/aluminum hydroxide, silica, silica, etc., can solve the problems of demanding corrosion resistance of equipment and high energy consumption in the process, and avoid high temperature The effect of sintering, reducing material consumption, and mild reaction conditions

Active Publication Date: 2011-02-09
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
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Problems solved by technology

Alkali method and acid-base combined method need to sinter high-aluminum fly ash and additives at high temperature, and...

Method used

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  • Method for extracting aluminum oxide and white carbon black through two-step alkaline leaching method by adopting high-alumina fly ash
  • Method for extracting aluminum oxide and white carbon black through two-step alkaline leaching method by adopting high-alumina fly ash
  • Method for extracting aluminum oxide and white carbon black through two-step alkaline leaching method by adopting high-alumina fly ash

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Embodiment Construction

[0039] The process flow chart of extracting alumina and white carbon black by the high-aluminum fly ash two-step alkali dissolution method of the present invention is as follows figure 1 shown. exist figure 1 The following 9 steps (1)-(9) can be clearly seen in:

[0040] (1) the step of grinding high-alumina fly ash into pulverized fly ash;

[0041] (2) Carrying out preliminary alkali dissolution of pulverized coal ash to obtain sodium silicate solution and desiliconized fly ash;

[0042] (3) CO 2 Passing through the sodium silicate solution to obtain the sodium carbonate solution and the silicic acid colloid, and washing and drying the silicic acid colloid to obtain white carbon black;

[0043] (4) the step of obtaining lye by causticizing the sodium carbonate solution, and returning the lye to carry out preliminary alkali dissolution for grinding fly ash;

[0044] (5) mixing desiliconized fly ash, lime and lye, and carrying out two-step alkali dissolution to make the step...

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Abstract

The invention discloses a process for preparing aluminum oxide and white carbon black by taking high-alumina fly ash as a raw material and adopting a two-step alkaline leaching method, comprising the following process steps of: preparing a sodium silicate solution by carrying out first-step alkaline leaching on the high-alumina fly ash; preparing the white carbon black by carrying out carbonation decomposition on the sodium silicate solution; preparing aluminum rich alkaline liquor by carrying out second-step alkaline leaching on desiliconization fly ash; preparing a sodium aluminate solution through the aluminum rich alkaline liquor; and preparing the aluminum oxide through the sodium aluminate solution, and the like. The invention prevents the high-temperature sintering in the process of the aluminum oxide prepared through the high-alumina fly ash, has low energy consumption and cyclic utilization of the alkaline liquor obtained through the first-step alkaline leaching and the second-step alkaline leaching, little material consumption; and in addition, silicon-calcium slag generated in the process course are used as raw materials for producing wall materials without generating secondary pollution, therefore the invention meets the requirements for clean production.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste, and in particular relates to a method for extracting alumina and white carbon black by a two-step alkali dissolution method of high-alumina fly ash. Background technique [0002] Fly ash is one of the solid wastes with the largest discharge in my country. A large amount of accumulation has caused huge pressure on the environment and society, and it is also a waste of alumina and silica resources. The use of high-aluminum fly ash to produce alumina and silicon compounds meets the requirements of developing a circular economy and building a conservation-minded society. In recent years, it has become a focus of attention and research by many researchers and enterprises. 在此方面发表的专利主要有87101461.0、200410062965.X、200410090949.1、200510048274.9、200610012780.7、200610139420.3、200710062534.7、200710065366.7、200710012997.2、200710116525.1、200710017304.9、、200710017453.5、200710061662.X、2007100...

Claims

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Application Information

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IPC IPC(8): C01B33/12C01F7/02B09B3/00
Inventor 苏双青马鸿文杨静邹丹李歌
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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