Thermal cracking method is a method of dressing spodumene ore sorting. The method is based on the natural spodumene calcination at about 1100 ° C, the crystal changes from α type to β type, while volume expansion, brittle into powder, which can be used to selectively grind and sieve to reach spodumene and gangue Separation of minerals. This method has been applied in the Canadian plant, China, and the Soviet test room. China's ore dressing workers have used raw ore containing 1.58% Li 3 O for testing. They were first calcined at 1050 ° C for one hour, cooled and placed in a rubber ball mill for selective grinding. Finally, they were sieved with a 150 mesh sieve. The obtained undersize concentrate has a grade of 4.9% Li 2 O and a recovery of 74%. The selection plant in Canada used the thermal cracking method to select the spodumene ore. The ore grade of the plant was 1.85% Li 2 O, and the obtained spodumene concentrate grade was 4.39% Li 2 O. The recovery rate was 85%. The flow is shown in Figure 1.
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There are two points to note when applying the thermal cracking method:
1 The calcination temperature is controlled at 1100 ° C. When the temperature is too high, the mica present in the ore will be sintered; when the temperature is too low, the transformation of spodumene from α to β is incomplete.
2 The ore should not contain a large amount of minerals that are easily melted during calcination or other minerals with thermal cracking properties, otherwise the purpose of separating spodumene may not be achieved.