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Method for extracting aluminum oxide from coal gangue

A technology of coal gangue and alumina, applied in alumina/aluminum hydroxide, solid waste removal, waste treatment and other directions, can solve the problems of inability to directly separate silicon and aluminum, poor quality of aluminum hydroxide, low sintering temperature, etc. Achieve the effect of alleviating the shortage of resources, short sintering time and low sintering temperature

Active Publication Date: 2011-09-14
安岭(陕西)环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, it not only solves the problem of high sintering temperature and Al 2 o 3 The key problems such as low extraction rate, inability to directly separate silicon and aluminum, and poor quality of aluminum hydroxide have overcome the Bayer process’s strict requirements on aluminum-silicon ratio (A / S) and ore mineral types, and achieved low sintering temperature , short sintering time, can effectively control the activation ratio of aluminum and silicon

Method used

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  • Method for extracting aluminum oxide from coal gangue
  • Method for extracting aluminum oxide from coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Mix the crushed coal gangue and solid sodium carbonate at a ratio of 1:0.6 and grind them into a 100-mesh mixed material.

[0035] (2) Calcining the mixed material obtained in step (1) at a temperature of 620° C. for 60 minutes to obtain roasted clinker. The roasted clinker is divided into several equal parts with the same quality for later use; during roasting, the roasting equipment is connected to the gas output pipe and connected to the carbon separation tank, and the recovered carbon dioxide gas is directly used for carbon separation.

[0036] (3) Add an appropriate amount of water to the first portion of roasted clinker, and make the solid-liquid mass ratio 1:6, and leaching for 50 minutes at a temperature of 10°C. After leaching, filter to obtain filter residue and filtrate respectively. After determination, the leaching rate of alumina in the filtrate is 70%, and the leaching rates of other components such as silicon dioxide and iron oxide are all zero.

...

Embodiment 2

[0044] (1) Mix the crushed coal gangue and solid sodium carbonate at a ratio of 1:2.5 and grind them into a 250-mesh mixed material.

[0045] (2) Calcining the mixed material obtained in step (1) at a temperature of 990° C. for 10 minutes to obtain roasted clinker. The roasted clinker is divided into several equal parts with the same quality for later use; during roasting, the roasting equipment is connected to the gas output pipe and connected to the carbon separation tank, and the recovered carbon dioxide gas is directly used for carbon separation.

[0046] (3) Add an appropriate amount of water to the first portion of roasted clinker, and make the solid-to-liquid mass ratio 1:120, and leaching at 85° C. for 5 minutes. After leaching, filter to obtain filter residue and filtrate respectively. After determination, the leaching rate of alumina in the filtrate is 75%, and the leaching rates of other components such as silicon dioxide and iron oxide are all zero.

[0047] Put ...

Embodiment 3

[0054] (1) Mix the crushed coal gangue and solid sodium carbonate at a ratio of 1:2.3 and grind them into a 150-mesh mixed material.

[0055] (2) Calcining the mixed material obtained in step (1) at a temperature of 720° C. for 50 minutes to obtain calcined clinker. The roasted clinker is divided into several equal parts with the same quality for later use; during roasting, the roasting equipment is connected to the gas output pipe and connected to the carbon separation tank, and the recovered carbon dioxide gas is directly used for carbon separation.

[0056] (3) Add appropriate amount of water to the first batch of roasted clinker, and make the solid-liquid mass ratio 1:15, and leaching for 40 minutes under the temperature condition of 20°C. After leaching, filter to obtain filter residue and filtrate respectively. After determination, the leaching rate of alumina in the filtrate was 79%, and the leaching rates of other components such as silicon dioxide and iron oxide were...

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Abstract

The invention discloses a method for extracting aluminum oxide from coal gangue, which comprises the following steps of: mixing and grinding the broken coal gangue and sodium carbonate in a certain ratio, roasting, performing circular extraction, precipitating, filtering, decomposing carbon, recycling carbon dioxide and an auxiliary agent, washing, calcining and the like to extract high-purity aluminum oxide from fly ash. Compared with other methods for extracting aluminum hydroxide from the fly ash, the method has the advantages that: the extraction ratio of the aluminum hydroxide is high, residues are a few, energy consumption is low, the process is simple, cost is low, the generated CO2 and the used auxiliary agent raw material can be recycled, and the like; and the problems of a complicated technology and high cost of the conventional process for extracting the aluminum hydroxide from the fly ash are solved, and a new way is opened up for the high-added value development and utilization of the coal gangue.

Description

Technical field: [0001] The invention belongs to the technical field of comprehensive utilization of solid waste discharged in the comprehensive production process of power generation, metallurgy, energy and chemical industry, and particularly relates to a method for extracting alumina from coal gangue. Background technique: [0002] Coal gangue is solid waste generated during coal mining and washing. my country is a large coal-producing country, and coal gangue accounts for 15% to 20% of the total raw coal output, and the utilization rate is less than 15%. Therefore, coal gangue has become the industrial solid waste with the largest accumulated stockpile and the largest area in my country, and the impact area of ​​coal gangue on the land and environment far exceeds its stacked area. [0003] Since alumina and silica are the main components of coal gangue, especially high-alumina coal gangue can form coal-measure kaolin, it can be said that coal gangue is also a kind of alu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B09B3/00
CPCY02W30/20
Inventor 潘爱芳马昱昭马润勇
Owner 安岭(陕西)环境科技有限公司
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