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Method for producing metallurgical-grade aluminum oxide by roasting-free and reinforced acid leaching of coal gangue

A technology for producing metallurgy and coal gangue, which is applied in chemical instruments and methods, alumina/hydroxide preparation, inorganic chemistry, etc., and can solve problems such as pollution and long-term accumulation of coal gangue in the environment

Pending Publication Date: 2022-04-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Coal gangue is the largest industrial solid waste discharged in my country. Large-scale processing and high-value utilization are the inevitable choices to solve the problems of long-term accumulation of huge amounts of coal gangue and environmental pollution.

Method used

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  • Method for producing metallurgical-grade aluminum oxide by roasting-free and reinforced acid leaching of coal gangue
  • Method for producing metallurgical-grade aluminum oxide by roasting-free and reinforced acid leaching of coal gangue

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0047] In order to accurately analyze the chemical composition of coal gangue raw materials, the coal gangue powder was calcined at high temperature before XRF analysis. The chemical composition of the calcined coal gangue raw material powder is shown in Table 1 (unit: mass percent, %). The data in Table 1 shows that in addition to kaolinite, the gangue used in the experiment also contains various chemical components such as quartz, iron, potassium, calcium, magnesium, titanium, etc. It is a kind of coal gangue with many types of impurities and high impurity content. Ordinary coal gangue raw material.

[0048] Table 1 Coal gangue chemical composition table (unit: mass percentage, %)

[0049]

[0050] Put 10 kg of coal gangue fragments in batches into a crusher with a high-speed cutting blade, turn on the power, and crush for 5 minutes. Coal gangue block raw materials are crushed into coal gangue powder. The coal gangue mineral powder and tap water are mixed and stirred e...

example 2

[0052] Weigh 200 grams of gangue powder prepared in Example 1, mix with 600ml of hydrochloric acid with a concentration of 25%, stir evenly, put it into two reactors with a volume of 500ml, react at 120°C for 1.5 hours, suction filter, wash and dry the filter cake, and collect the filtrate. The contents of silicon dioxide, aluminum oxide and ferric oxide in the filter cake were analyzed by XRF to be 85.418%, 10.285%, and 0.638%, respectively.

example 3

[0054] Weigh 200 grams of gangue powder prepared in Example 1, mix it with 600ml of hydrochloric acid with a concentration of 20%, stir evenly, put it into two reactors with a volume of 500ml, react at 160°C for 2.5 hours, suction filter and wash and dry the filter cake, and collect the filtrate. The contents of silicon dioxide, aluminum oxide and ferric oxide in the filter cake were analyzed by XRF to be 91.173%, 5.010%, and 0.318%, respectively.

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Abstract

The invention discloses a method for producing metallurgical-grade aluminum oxide by roasting-free and reinforced acid leaching of coal gangue. According to the method, roasting activation of raw materials is not carried out, the coal gangue powder is subjected to acid leaching by heating and pressurizing intensified hydrochloric acid, and an acid leaching solution is used for producing metallurgical-grade aluminum oxide. The method mainly comprises the following steps: mechanical crushing and wet ball milling of the coal gangue, oxalic acid deironing, enhanced acid leaching, resin adsorption impurity removal, spray granulation, one-step pyrolysis and hydrogen chloride absorption to obtain a metallurgical-grade aluminum oxide product with the purity of more than 99%, and recycling industrial concentrated hydrochloric acid obtained by absorbing hydrogen chloride for enhanced acid leaching of the coal gangue. The method has the advantages of low production cost, high product value and easy realization of large-scale production, and is a reasonable process for high-value utilization of coal gangue.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and relates to a method for producing metallurgical-grade alumina without roasting and strengthening hydrochloric acid leaching coal gangue powder. [0002] technical background [0003] my country is a big country of coal production and consumption. The coal gangue discarded in the process of coal mining and processing in my country exceeds 200 million tons every year, with a total of more than 5 billion tons. It is one of the largest industrial solid wastes in China. Abandoned coal gangue occupies a large amount of land and seriously pollutes the environment. How to deal with large-scale and high-value coal gangue has always been a major problem that plagues relevant regions and enterprises. my country is a big producer of alumina and metal aluminum. In recent years, my country has produced nearly 70 million tons of metallurgical-grade alumina and over 30 million tons of met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/22C01F7/30C22B7/00C22B21/00
CPCY02P10/20
Inventor 卢旭晨闫岩张志敏
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI