Method for preparing lithium carbonate by extracting lithium from lepidolite by adopting two-stage chloridizing roasting and alkali liquor leaching method
A technology of lye leaching and chlorination roasting, which is applied in the field of metallurgy, can solve the problems of large amount of chlorination agent, environmental pollution, equipment corrosion, etc., and achieve the effects of high recovery rate, reduced energy consumption, and low cost
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Embodiment 1
[0038] Such as figure 1 Shown, a kind of two-stage chlorination roasting-lye leaching method extracts lithium from lepidolite and prepares the method for lithium carbonate, comprises the following steps:
[0039] (1) Will Li 2 Lepidolite with O content of 3.8% and calcium chloride are ground and mixed at a mass ratio of 1:0.5, and then wetted with a certain quality of ammonium chloride solution to form pellets to obtain green pellets with a particle size of 15mm (if the pellets need to be dried, they can be roasted) Drying the raw pellets can reduce part of the water and reduce the energy loss of the subsequent chlorination treatment. Generally, the pelletizing process needs to add water several times. According to the principle of "reduce water when the ball is large, and add water when the ball is small", control The mass ratio of ammonium chloride to lepidolite is 0.3:1;
[0040] (2) The green balls obtained in step (1) are roasted for 1 hour at 150°C, and then roasted fo...
Embodiment 2
[0046] A two-stage chlorination roasting-lye leaching method extracts lithium from lepidolite and prepares lithium carbonate, comprising the following steps:
[0047] (1) Will Li 2 Lepidolite with O content of 4.5% and calcium chloride are ground and mixed at a mass ratio of 1:0.5, and then wetted with a certain mass of ammonium chloride solution to obtain green pellets with a particle size of 10mm (if the pellets need to be dried, they can be roasted) Drying the raw pellets can reduce part of the water and reduce the energy loss of the subsequent chlorination treatment. Generally, the pelletizing process needs to add water several times. According to the principle of "reduce water when the ball is large, and add water when the ball is small", control The mass ratio of ammonium chloride and lepidolite is 0.5:1;
[0048] (2) Carry out the green ball obtained in the step (1) at 200 ℃ for 0.5h, and then at 650 ℃ for 2.5h to obtain clinker (can be carried out in the same calcinat...
Embodiment 3
[0054] A two-stage chlorination roasting-lye leaching method extracts lithium from lepidolite and prepares lithium carbonate, comprising the following steps:
[0055] (1) Will Li 2 O content of 4.3% lepidolite and calcium chloride are ground and mixed at a mass ratio of 1:0.5, and then wetted with a certain quality of ammonium chloride solution to form pellets to obtain green pellets with a particle size of 10mm (if the pellets need to be dried, they can be roasted) Drying the raw pellets can reduce part of the water and reduce the energy loss of the subsequent chlorination treatment. Generally, the pelletizing process needs to add water several times. According to the principle of "reduce water when the ball is large, and add water when the ball is small", control The mass ratio of ammonium chloride to lepidolite is 0.4:1;
[0056] (2) Carry out the green ball obtained in step (1) at 250 ℃ for 0.5h, and then at 550 ℃ for 1.5h to obtain clinker (can be carried out in the same...
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