Lithium-mica heap leaching method
A lepidolite and heap leaching technology, which is applied in the field of lithium extraction from ores, can solve the problems of long aging time, low equipment capacity, and high grinding cost, and achieve high acid concentration, low equipment investment, and reduced grinding energy consumption and cost. Effect
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Embodiment 1
[0074] The composition of a lepidolite sample is as follows:
[0075] Element
Li 2 o
SiO 2
Al 2 o 3
K 2 o
Fe 2 o 3
MnO
F
Rb 2 o
Na 2 o
Cs 2 o
content%
3.17
48.7
22.6
7.8
2.2
0.40
4.5
0.86
0.87
0.06
[0076] Proceed as follows:
[0077] ① 100Kg lepidolite is finely ground, after grinding +60 mesh 6.1%, -200 mesh 70%;
[0078] ② Add 90kg of concentrated sulfuric acid with a concentration of 96% to the finely ground lepidolite sample and mix well, then add 10kg of water and 5kg of fluorosilicic acid, mix well, and then put it in an oven at 180°C for aging for 4 hours;
[0079] ③Crush the matured material to 5-20mm, and then put it into a heap leaching column with a diameter of Φ200×3500, and the height of the material layer is 3.2m;
[0080] ④Spray water on the ore heap for heap leaching operation, the water temperature is 25°C, and the spraying intensity is 40L / m 2 h,...
Embodiment 2
[0084] The composition of a lepidolite sample is as follows:
[0085] Element
Li 2 o
SiO 2
al 2 o 3
K 2 o
Fe 2 o 3
MnO
F
Rb 2 o
Na 2 o
content%
2.87
54.6
23.5
8.3
1.54
0.39
4.1
0.93
0.83
[0086] Proceed as follows:
[0087] ① 125Kg lepidolite is finely ground, after grinding +60 mesh 9.3%, -200 mesh 35%;
[0088] ② Add 100Kg of 97% concentrated sulfuric acid to the finely ground lepidolite sample and mix well, then add 20L of the first stage effluent collected in Example 1, and 3kg of fluorosilicic acid, quickly mix well, and then put it at 150°C Curing in the oven for 12 hours;
[0089] ③Crush the matured material to 10-30mm, and then put it into a heap leaching column with a diameter of Φ200×3500, and the height of the material layer is 4m;
[0090] ④ Spray the third effluent collected in Example 1 on the ore heap first, and then add water for spraying after use, the temp...
Embodiment 3
[0094] The composition of a lepidolite sample is as follows:
[0095] Element
Li 2 o
SiO 2
al 2 o 3
K 2 o
Fe 2 o 3
MnO
F
Rb 2 o
Na 2 o
content%
3.36
47.3
23.8
8.8
3.45
0.44
4.8
1.04
0.98
[0096] Proceed as follows:
[0097] ① 3000Kg lepidolite is finely ground, after grinding +60 mesh 5.4%, -200 mesh 56%;
[0098] ②Add 2400Kg of concentrated sulfuric acid with a concentration of 93% to the finely ground lepidolite ore sample and mix well, then add 450L of the first stage effluent collected under the same conditions as before, and 200kg of fluorosilicic acid, quickly mix well, and then transfer to aging Fill the pool with hot air at 120°C and heat-preserve for 15 hours;
[0099] ③Crush the matured material to 5-50mm, and then put it into a heap leaching tower with a size of 900×900×5500, and the height of the material layer is 5m;
[0100] ④ Spray the third stage of the effl...
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