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
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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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