Rare earth ore extraction device and extraction method
An extraction method and rare earth ore technology, which is applied in the field of rare earth ore extraction equipment, can solve the problems of low utilization rate of rare earth elements and high tail gas treatment cost, and achieve the effects of inhibiting the decomposition of sulfuric acid in large quantities, reducing the cost of tail gas treatment, and reducing the probability of mixing
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Embodiment 1
[0058] Take 500 kg of rare earth ore and sulfuric acid and mix them according to the weight ratio of 1:0.8, and then continuously add them into the roasting unit 10 (multi-layer furnace) to obtain the rare earth roasted ore. The firing temperatures of each layer in the multilayer furnace are shown in Table 1.
[0059] Table 1
[0060] Layers of multi-hearth furnace
1
2
3
4
5
6
7
8
9
10
Roasting temperature
80
80
150
150
250
250
250
300
250
200
[0061] During the whole process, the roasting time of each layer is the same, and the total roasting time is 6 hours. Sulfuric acid is replenished in the 4th, 5th, 6th, and 7th layers. The sulfuric acid replenishment is about 30wt% of the added rare earth ore.
[0062] The roasting flue gas is washed with sulfuric acid by the sulfuric acid rinsing device 21 and repeatedly washed by the water washing device 22 (horizontal scrubber) to obtain a hydrofluoric...
Embodiment 2
[0065] Take 500kg of rare earth ore and sulfuric acid and mix them according to the weight ratio of 1:1, and then continuously add them into the roasting unit 10 (multi-layer furnace) to obtain the rare earth roasted ore. The firing temperature of each layer in the multilayer furnace is shown in Table 2.
[0066] Table 2
[0067] Layers of multi-hearth furnace
1
2
3
4
5
6
7
8
9
10
Roasting temperature
80
100
150
250
250
250
280
300
250
200
[0068] During the whole process, the roasting time of each layer is the same, and the total roasting time is 10h. Sulfuric acid is replenished in the 3rd, 4th, 5th, 6th, and 7th layers. The sulfuric acid replenishment is about 30wt% of the added rare earth ore.
[0069] The roasting flue gas is washed with sulfuric acid by the sulfuric acid rinsing device 21 and repeatedly washed by the water washing device 22 (horizontal scrubber) to obtain a hydrofluoric ac...
Embodiment 3
[0072] On the basis of Example 2, keeping other reaction conditions unchanged, the rare earth ore and sulfuric acid were mixed and continuously added into the multi-layer furnace according to the weight ratio of 1:0.3.
[0073] The rare earth roasted ore has been verified by water leaching. The rare earth leaching rate is 66wt%, the thorium leaching rate is 63.7wt%, and the specific activity of slag radioactivity is 3625Bq / Kg.
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