Method for extracting valuable metal elements from coal gangue

A technology for metal elements and coal gangue, which is applied in the field of extracting valuable substances from coal gangue minerals, can solve the problems of secondary pollution, high requirements on corrosion resistance, a large amount of residues and waste water, etc., and achieves the effect of improving activity.

Pending Publication Date: 2021-07-02
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest problem with this method is that high-temperature activation treatment is required in the early stage of coal research and stone, which means that there is an obvious energy consumption problem in the process of pre-treatment of coal research and stone, and acid leaching in this process In the process, there will be a large amount of residue and waste water in the follow-up, which will easily cause secondary pollution
In addition, high-concentration acid-base treatment requires higher corrosion resistance of equipment

Method used

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  • Method for extracting valuable metal elements from coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Table 1 shows the phase composition of coal gangue minerals. Such as figure 1 As shown, coal gangue minerals were crushed and ground to 74 microns, and activated at 320°C and 8 MPa subcritically for 30 minutes to obtain activated coal gangue ore. After activation, most of the minerals were dissociated, and then classified into organic Liquid phase and slag phase, the separated organic liquid phase is changed into carbon dioxide and water through supercritical reaction. The supercritical reaction temperature is 373°C and the pressure is 22.5MPa. And alumina, silicate and ore containing a small amount of ilmenite element, the enriched ore of carbon and silicon dioxide is electro-selected to obtain high-grade carbon and silicon dioxide, the grade of carbon is 90%, and the grade of silicon dioxide is 95%. Alumina, silicate and minerals containing a small amount of ilmenite are added with sodium carbonate and calcium carbonate for roasting. The roasting temperature is 850°...

Embodiment 2

[0035] Table 1 shows the phase composition of coal gangue minerals. Such as figure 1 As shown, the coal gangue ore is crushed and ground to 36 microns, and activated at 250 °C and 20 MPa subcritically for 30 minutes to obtain the activated coal gangue ore. After activation, most of the minerals are dissociated, and then classified into organic Liquid phase and slag phase, the separated organic liquid phase is changed into carbon dioxide and water through supercritical reaction. The supercritical reaction temperature is 373°C and the pressure is 22.5MPa. And alumina, silicate and ore containing a small amount of ilmenite element, the enriched ore of carbon and silicon dioxide is electro-selected to obtain high-grade carbon and silicon dioxide, the grade of carbon is 80%, and the grade of silicon dioxide is 90%. Alumina, silicate and minerals containing a small amount of ilmenite are added with sodium carbonate and calcium carbonate for roasting. The roasting temperature is 75...

Embodiment 3

[0037] Table 1 shows the phase composition of coal gangue minerals. Such as figure 1 As shown, the coal gangue ore is crushed and ground to 0.15 mm, and activated at 400 °C and 15 MPa subcritically for 30 minutes to obtain activated coal gangue ore. After activation, most of the minerals are dissociated, and then classified into organic Liquid phase and slag phase, the separated organic liquid phase is changed into carbon dioxide and water through supercritical reaction. The supercritical reaction temperature is 373°C and the pressure is 22.5MPa. And alumina, silicate and ore containing a small amount of ilmenite element, the enriched ore of carbon and silicon dioxide is electro-selected to obtain high-grade carbon and silicon dioxide, the grade of carbon is 75%, and the grade of silicon dioxide is 76%. Add sodium carbonate and calcium carbonate to alumina, silicate and minerals containing a small amount of ilmenite for roasting, the roasting temperature is 950°C, dissolve a...

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Abstract

The invention provides a method for extracting valuable metal elements from coal gangue. The method comprises the following steps of: crushing and grinding coal gangue ore, performing supercritical / subcritical water activation, classifying the coal gangue ore into an organic liquid phase and a slag phase by a hydrocyclone, and synthesizing carbon dioxide and water from the organic liquid phase through a supercritical reaction, wherein the carbon dioxide is used for a subsequent sodium aluminate reaction to obtain aluminum hydroxide, the water is used for supplementing water to a shaking table, and the slag phase passes through the shaking table to obtain enriched ore of carbon and silicon dioxide, aluminum oxide, silicate and ore containing a small amount of titanium and iron elements. Carbon and silicon dioxide are separated and collected through electric separation, aluminum oxide, silicate and ore containing a small amount of titanium and iron elements are added into sodium carbonate and calcium carbonate to be roasted and dissolved after roasting, slag of calcium silicate and calcium titanate is obtained and can be used as a coating, a dissolving solution contains sodium aluminate, sodium ferrite and other substances, sodium hydroxide is added into the dissolving solution to generate ferric hydroxide and sodium aluminate, the ferric hydroxide can be used as a coating, and carbon dioxide is introduced into the sodium aluminate to generate aluminum hydroxide which is used as an inorganic flame-retardant additive.

Description

technical field [0001] The invention relates to the technical field of extracting valuable substances from coal gangue minerals, in particular to a method for extracting valuable metal elements from coal gangue. Background technique [0002] my country is the world's largest coal producer and consumer, with a national coal output of 3.85 billion tons in 2019. Coal gangue is a solid waste produced during coal production and processing, and is a symbiotic resource of coal. Its production accounts for 10% to 25% of coal mining. Coal gangue includes the gangue discharged during the tunneling of coal mines, the gangue stripped during open-pit coal mining and the gangue discharged during the sorting process, which is a mixture of various mineral rocks. my country's coal gangue production has accumulated more than 5 billion tons. In 2019, the utilization rate of coal gangue in my country was 70%, and the utilization rate of developed countries represented by the United Kingdom and...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B21/00C22B26/10C22B26/20C22B34/12C01B32/00C01B33/12C01F7/08C01F7/14C01G49/00C01G49/02B03B7/00
CPCC22B7/006C22B21/0015C22B34/1236C22B26/10C22B26/20C01F7/08C01F7/142C01G49/02C01G49/0027C01B32/00C01B33/12B03B7/00Y02P10/20Y02P20/54
Inventor 李科杜红伟包中华
Owner INNER MONGOLIA UNIV OF SCI & TECH
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