Method for leaching spodumene based on combination of microwave and pressure field
A technology of spodumene and pressure field, which is applied in the field of joint leaching of spodumene based on microwave and pressure field, can solve the problems of narrow transformation temperature range and low transformation rate of spodumene raw ore, and reduce the hidden danger of melting rings, The effect of short process and short technological process
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Embodiment 1
[0033] A method based on microwave and pressure field combined leaching spodumene, comprising the steps:
[0034] 1) Grinding: use spodumene concentrate as raw material, grind, add coal powder of 2% of the total mass of raw material, mix evenly, and obtain a mixture;
[0035] 2) Crystal transformation
[0036] Using the silicon carbide lining the rotary kiln as the heat source carrier, heat the mixture obtained in step 1) to 1000°C under the condition of microwave power of 1500w, and then use microwave irradiation to transform the crystal form at a constant temperature of 1000°C 15min, then cooled to room temperature to obtain β-type spodumene;
[0037] 3) Leaching
[0038] Grind the β-type spodumene obtained in step 2), and add water to make a slurry to obtain a slurry; put the slurry into an autoclave, then add sulfuric acid with a concentration of 2%, and under the conditions of a pressure of 0.2Mpa and 120°C, the stirring speed is 500r / min, leaching for 20min to obtain ...
Embodiment 2
[0041] A method based on microwave and pressure field combined leaching spodumene, comprising the steps:
[0042] 1) Grinding: use spodumene concentrate as raw material, grind, add coal powder with 8% of the total mass of raw material, mix evenly, and obtain a mixture;
[0043] 2) Crystal transformation
[0044] Using the silicon carbide lining the rotary kiln as the heat source carrier, the mixture obtained in step 1) is heated to 1180°C under the condition of microwave power of 4000w, and then the crystal form is transformed under the constant temperature condition of 1180°C by microwave irradiation. 120min, then cooled to room temperature to obtain β-type spodumene;
[0045] 3) Leaching
[0046] Grind the β-type spodumene obtained in step 2), and add water to make a slurry to obtain a slurry; put the slurry into an autoclave, then add sulfuric acid with a concentration of 10%, and under the conditions of a pressure of 1.6Mpa and 200°C, the stirring speed is 1800r / min, le...
Embodiment 3
[0049] A method based on microwave and pressure field combined leaching spodumene, comprising the steps:
[0050] 1) Grinding: use spodumene concentrate as raw material, grind, add coal powder with 5% of the total mass of raw material, mix evenly, and obtain a mixture;
[0051] 2) Crystal transformation
[0052] Using the silicon carbide lining the rotary kiln as the heat source carrier, heat the mixture obtained in step 1) to 1100°C under the condition of microwave power of 2500w, and then use microwave irradiation to transform the crystal form under the constant temperature condition of 1100°C 60min, then cooled to room temperature to obtain β-type spodumene;
[0053] 3) Leaching
[0054] Grind the β-type spodumene obtained in step 2), and add water to make a slurry to obtain a slurry; put the slurry into an autoclave, then add sulfuric acid with a concentration of 6%, and under the conditions of a pressure of 0.8Mpa and 160°C, the stirring speed is 1100r / min, leaching fo...
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