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A method for comprehensive utilization of coal gangue

A technology for coal gangue and coal gangue fine powder, applied in chemical instruments and methods, removal of silicon compounds, solid waste, etc., can solve the problems of polysulfuric acid, easy to see, low yield of cryolite, etc., and achieve high utilization rate , low cost, and the effect of improving comprehensive utilization value

Active Publication Date: 2016-05-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Although the quality of the product produced by this method can reach the national first-class standard as the author introduces, it is not difficult to see that more HF acid is used in this process, and Glauber's salt is added, so that the by-product produces more sulfuric acid
In addition, the reaction cryolite yield is not high

Method used

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  • A method for comprehensive utilization of coal gangue
  • A method for comprehensive utilization of coal gangue
  • A method for comprehensive utilization of coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) Acid leaching of coal gangue

[0048] 1.1) Coarsely grind the coal gangue block and place it in a ceramic crucible, calcinate it in an electric furnace at 750°C for 1.5 hours, take it out and cool it to room temperature in the air to obtain calcined coal gangue; put the calcined coal gangue into a ball mill tank for dry ball milling 24h, cross 180 mesh sieves to obtain coal gangue fine powder;

[0049] 1.2) Prepare concentrated sulfuric acid with a mass concentration of 65% with deionized water, then add coal gangue fine powder to the concentrated sulfuric acid at a liquid-solid ratio of 5mL / g, heat and stir at a constant temperature at 90°C for 2 hours in a constant temperature water bath To carry out acid leaching to obtain an acid leaching product;

[0050] 1.3) The acid extraction product is subjected to centrifugal filtration to separate the solid from the liquid, and the clear liquid obtained after the solid-liquid separation is the aluminum sulfate solution f...

Embodiment 2

[0063] 1) Acid leaching of coal gangue

[0064] 1.1) Coarsely grind the coal gangue block and place it in a ceramic crucible, calcinate it in an electric furnace at 700°C for 2 hours, take it out and cool it to room temperature in the air to obtain calcined coal gangue; put the calcined coal gangue into a ball mill tank for dry ball milling for 24 hours , through a 200-mesh sieve to obtain coal gangue fine powder;

[0065] 1.2) Prepare concentrated sulfuric acid with a mass concentration of 60% with deionized water, then add coal gangue fine powder into the concentrated sulfuric acid at a liquid-solid ratio of 5.5mL / g, heat and stir at a constant temperature at 95°C in a constant temperature water bath 2h to carry out acid leaching to obtain the acid leaching product;

[0066] 1.3) The acid extraction product is subjected to centrifugal filtration to separate the solid from the liquid, and the clear liquid obtained after the solid-liquid separation is the aluminum sulfate sol...

Embodiment 3

[0074] 1) Acid leaching of coal gangue

[0075] 1.1) Coarsely grind the coal gangue block and place it in a ceramic crucible, calcinate it in an electric furnace at 730°C for 2 hours, take it out and cool it to room temperature in the air to obtain calcined coal gangue; put the calcined coal gangue into a ball mill tank for dry ball milling for 24 hours , cross 180 mesh sieves to obtain coal gangue fine powder;

[0076] 1.2) Prepare concentrated sulfuric acid with a mass concentration of 65% with deionized water, then add coal gangue fine powder into the concentrated sulfuric acid at a liquid-solid ratio of 5.2mL / g, heat and stir at a constant temperature at 85°C in a constant temperature water bath 2.5h to carry out acid leaching to obtain the acid leaching product;

[0077] 1.3) The acid extraction product is subjected to centrifugal filtration to separate the solid from the liquid, and the clear liquid obtained after the solid-liquid separation is the aluminum sulfate solu...

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Abstract

The invention discloses a comprehensive utilization method of coal gangue. The comprehensive utilization method of the coal gangue comprises the following steps: separating alumina-silica of coal gangue by adopting a baking, crushing, sulfuric acid leaching and centrifugal separation method, thereby obtaining an aluminum salt Al2(SO4)3 solution and filter residues (SiO2); adding slaked lime (Ca(OH)2) into the filter residues, adding caustic soda NaOH according to the molar ratio of Ca / Na of 1 to (1.0-2.0), and carrying out hydrothermal autoclaved reaction at 160-180 DEG C for 16-18 hours by adopting a hydrothermal autoclaved method so as to synthesize a tobermorite sewage treatment adsorption material with a good crystallization state; compounding sodium hydrogen fluoride NaHF2 formed by sodium fluoride NaF and hydrofluoric acid HF with the leached supernate Al2(SO4)3 solution, and carrying out full reaction under stirring for 1-1.5 hours so as to synthesize cryolite. The invention provides a solution for preparing the tobermorite sewage adsorption material by utilizing silicon dioxide in coal gangue and preparing cryolite by utilizing the alumina component; and the obtained materials have a favorable application prospect, and the aim of preparing materials with high additional value by comprehensively utilizing coal gangue is achieved.

Description

technical field [0001] The invention belongs to the field of ecological environment materials, and in particular relates to a comprehensive utilization method of coal gangue. Background technique [0002] Coal gangue is solid waste generated during coal mining and processing, and is one of the largest solid wastes in the world today. Coal gangue is mainly composed of a large amount of inorganic matter mixed with a small amount of organic matter. It is a black-gray rock with low carbon content and harder than coal that is associated with coal seams during the coal formation process. This kind of gangue-type hard kaolinite formed by volcanic ash deposition and alteration has high quality and large quantity, stable occurrence and wide distribution. With the increase of coal mining in coal mines and the emphasis on coal washing and processing, the discharge of coal gangue in my country has exceeded 200,000 tons, covering an area of ​​nearly 13,300 hectares. The massive dischar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30C01B33/24C01F7/54B09B3/00
CPCB01J20/103C01F7/54C02F1/281
Inventor 张超武宋大龙缪金良时春辉张利娜王芬周嘉维
Owner SHAANXI UNIV OF SCI & TECH
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