A method for efficiently utilizing high-alumina coal gangue

A high-alumina coal gangue, high-efficiency technology, applied in chemical instruments and methods, aluminum compounds, silica, etc., can solve problems such as unseen reports

Active Publication Date: 2020-10-27
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] To sum up, researchers have done a lot of work on the efficient dissolution of coal gangue, especially in the efficient extraction of aluminum in coal gangue and the preparation of related chemical products; but through reasonable process optimization and product design, the use of coal The method of producing polyaluminum ferric sulfate, aluminum hydroxide (or further calcined to produce alumina) and white carbon black has not been reported yet

Method used

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  • A method for efficiently utilizing high-alumina coal gangue
  • A method for efficiently utilizing high-alumina coal gangue
  • A method for efficiently utilizing high-alumina coal gangue

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) if figure 1 As shown, the analysis results of coal gangue raw materials and ash content are shown in Table 1.1. It can be seen from the table that this coal gangue has a relatively high calorific value, and the heat should be recovered before slag utilization;

[0033] Table 1.1 Coal gangue raw material and ash analysis

[0034]

[0035] (2) Dried the coal gangue and pulverized it, and ground it to a sieve residue of 9.98% through an 80-mesh sieve, and used a circulating fluidized bed to recover heat to obtain slag;

[0036] (3) Add industrial sulfuric acid with a mass concentration of 98% to the coal gangue slag of step (2) at a mass ratio of 1:1.2 to gangue, and solidify at 50°C;

[0037] (4) According to the mass ratio of industrial sulfuric acid and slag being 0.2, take out the coal gangue solidified material in step (3) and add 98% industrial sulfuric acid in the form of spray, and transfer it to a vertical acidification kiln for acidification reaction. Th...

Embodiment 2

[0044] (1) The analysis results of coal gangue raw materials and ash content are shown in Table 2.1. It can be seen from the table that the low-level calorific value of this coal gangue is 820cla / kg, which meets the heat recovery requirements. The heat should be recovered before slag utilization;

[0045] Table 2.1 Coal gangue raw material and ash analysis

[0046]

[0047] (2) Dried the coal gangue and pulverized it, and ground it to a sieve residue of 6.23% through an 80-mesh sieve, and used a circulating fluidized bed to recover heat to obtain slag;

[0048] (3) adding industrial sulfuric acid with a mass concentration of 98% to the coal gangue slag of step (2) at a mass ratio of 1:1.1 to gangue, and solidifying at room temperature;

[0049] (4) According to the mass ratio of industrial sulfuric acid and slag being 0.1, take out the coal gangue solidified material in step (3) and add 98% industrial sulfuric acid in the form of spray, and transfer it to a vertical acidifi...

Embodiment 3

[0056] (1) The analysis results of coal gangue raw materials and ash content are shown in Table 3.1. It can be seen from the table that the low-level calorific value of this coal gangue is 452cla / kg, which does not meet the heat recovery requirements. The coal gangue is directly used after drying, crushing and grinding;

[0057] Table 3.1 Coal gangue raw material and ash analysis

[0058]

[0059] (2) Grinding the coal gangue in step (1) to a sieve residue of 4.56% through a 100-mesh sieve;

[0060] (3) Add industrial sulfuric acid with a mass concentration of 98% to the coal gangue slag of step (2) at a mass ratio of 1:1.2 to gangue, and solidify at 35°C;

[0061] (4) According to the mass ratio of industrial sulfuric acid and slag being 0.15, take out the coal gangue solidified material in step (3) and add 98% industrial sulfuric acid in the form of spray, and transfer it to a vertical acidification kiln for acidification reaction. The heating temperature at the inlet of...

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Abstract

The invention discloses a method for efficiently utilizing high-aluminum gangue, and belongs to the technical field of resource utilization of industrial solid waste. The method comprises the following steps: curing after adding acid in gangue or cinder, and then acidifying, dissolving out, filtering and washing, thus obtaining a sulfate solution which mainly contains aluminum sulfate and silicon-enriched acid sludge in which impurities are removed, wherein the sulfate solution is used for preparing aluminum hydroxide or aluminum oxide and polyaluminum sulfate products, and white carbon blackcan be generated by roasting the acid sludge. The method disclosed by the invention is reasonable in the resource utilization, no new solid waste emission is generated, the market constant of the products is large, and a feasible method can be provided for resource utilization of the high-aluminum gangue.

Description

technical field [0001] The invention discloses a method for efficiently utilizing high-alumina coal gangue, and belongs to the technical field of resource utilization of industrial solid waste and comprehensive utilization of resources. Background technique [0002] At present, coal gangue is a kind of black rock associated with coal seams in the process of coal formation, and it is a waste produced in the process of coal selection and mining. The annual output of coal gangue in my country reaches 15%-20% of the total amount of coal mining and 40% of the total amount of industrial waste in the country, but the overall utilization rate is not high. As of 2015, the utilization rate of coal gangue has reached 70%, far from the target of 80% utilization rate of coal gangue resources, the pressure is very huge. The accumulation of a large amount of coal gangue will not only occupy a large amount of land, but also pollute the surrounding ecological environment and cause a waste of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/26C01F7/44C01G49/00C01B33/12
CPCC01B33/12C01F7/26C01F7/441C01G49/009C01P2006/12C01P2006/19C01P2006/80
Inventor 夏举佩辜芳
Owner KUNMING UNIV OF SCI & TECH
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