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Process for extracting valuable metal from coal gangues

A technology of valuable metals and coal gangue, which is applied in the field of extracting valuable metals, can solve the problems of complicated process, high energy consumption, and no chemical reactivity, etc., and achieve the effect of simple process and low energy consumption

Inactive Publication Date: 2013-10-09
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Naturally occurring coal gangue without spontaneous combustion has almost no chemical reactivity, and it is difficult to directly extract and utilize it
In the past, people used coal gangue to dissolve → AlCl 3 Hydrolysis→alkali dissolution to remove iron→carbonization to precipitate Al(OH) 3 →washing→drying→roasting process to extract Al 2 o 3 , but this method is complicated in process and high in energy consumption, which is not conducive to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of alumina from coal gangue:

[0023] A. Coarse crushing and fine grinding: the coal gangue is dried and crushed into particles smaller than 20mm, and then ball-milled into a powder with a fineness of less than 5%;

[0024] B. Activation: Take an appropriate amount of coal gangue powder and spread it in a furnace heated to 500-600°C, calcinate for 0.5-1 hour, take it out and cool it naturally;

[0025] C. Acid melting: put the calcined coal gangue in a three-necked flask, and add a measured acid solution; heat it up to the temperature required for the reaction to 880-950°C under stirring. During the reaction, the evaporated water vapor Condensation and reflux continue to react until the specified time: 0.5-1 hour;

[0026] D. Solid-liquid separation: filter the reacted slurry while it is hot, wash the filter cake 2-3 times with clear water, dilute the filtrate to a specified concentration, and test the content of iron ions and aluminum sulfate in the filtra...

Embodiment 2

[0030] Preparation of alumina and silica from coal gangue:

[0031] A. Coarse crushing and fine grinding: the coal gangue is dried and crushed into particles smaller than 20mm, and then ball-milled into a powder with a fineness of less than 5%;

[0032] B. Activation: Take an appropriate amount of coal gangue powder and spread it in a furnace heated to 500-600°C, calcinate for 0.5-1 hour, take it out and cool it naturally;

[0033] C. Acid melting: put the calcined coal gangue in a three-necked flask, and add a measured acid solution; heat it up to the temperature required for the reaction to 880-950°C under stirring. During the reaction, the evaporated water vapor Condensation and reflux continue to react until the specified time: 0.5-1 hour;

[0034] D. Solid-liquid separation: filter the reacted slurry while it is hot, wash the filter cake 2-3 times with clear water, dilute the filtrate to a specified concentration, and test the content of iron ions and aluminum sulfate in...

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Abstract

The invention discloses a process for extracting a valuable metal from coal gangues. The process is characterized by comprising the following steps of: A, coarse crushing and fine grinding: coarsely crushing the coal gangues into particles, and then finely grinding the particles into fine particles of which the particle size is less than 1mm; B, activation: putting the fine particles obtained in the step A into a furnace, and activating for 0.5-1 hour; C, acid fusion: putting the activated fine particles in the step B into a container, adding a sulfuric acid solution, heating to 880-950 DEG C under a stirring condition, and reacting for 0.5-1 hour to obtain a solution and coal gangue acidolysis residues; D, solid-liquid separation: filtering the solution obtained in the step C by adopting filter cakes when the solution is hot; E, extraction: adding the filtrate into an extract, oscillating for 0.3-1 hour, standing for layering, heating lower-layer liquid to 80-120 DEG C, concentrating, cooling and crystallizing the lower layer liquid, and crushing crystals into particles; and F, heating for forming: heating the crystal particles obtained in the step E until the crystal particles become powder, and heating the powder in a tube furnace in an airtight mode to obtain a valuable metal namely solid aluminum oxide.

Description

technical field [0001] The invention relates to a process for extracting valuable metals from coal gangue. Background technique [0002] Coal gangue is the solid waste with the largest discharge and stacking volume in my country at present. The total stacking volume of coal gangue in the country is about 4.5 billion tons, causing great environmental pollution and waste of resources. Rational use of coal gangue can not only recover useful minerals, produce building materials and some common chemical products, but also extract Al 2 o 3 , SiO 2 and other high value-added products. The mineral composition of coal gangue is mainly kaolinite, in which Al 2 o 3 The content can reach 20% to 30%, which is a potential aluminum resource. Naturally occurring coal gangue without spontaneous combustion has almost no chemical reactivity, and it is difficult to extract and utilize it directly. In the past, people used coal gangue to dissolve → AlCl 3 Hydrolysis→alkali dissolution to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01B33/113
Inventor 齐明思张峰曹雄
Owner ZHONGBEI UNIV
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