Method for for carrying out fluidized extraction on spodumene by utilizing sulfide

Abstract

The invention discloses a method for carrying out fluidized extraction on spodumene by utilizing sulfide. The method comprises the following steps: uniformly mixing sulfide and spodumene powder, and carrying out fluidized high-temperature roasting on the mixture; and then extracting the calcined spodumene powder by using an extracting solution to obtain a leaching solution containing lithium sulfate. By roasting the mixture of sulfide and spodumene, lithium in spodumene can be extracted with low energy consumption, so that energy consumption is low, and environmental pollution is avoided; andthe extracted lithium salt has high purity and can be used in the fields of lithium batteries, nuclear power and the like.

Description

technical field

[0001] The invention belongs to the technical field of spodumene, and in particular relates to a method for fluidized extraction of spodumene by using sulfide. Background technique

[0002] Spodumene is a monoclinic crystal system, and the crystals are often columnar, granular or plate-like. The color is off-white, gray-green, purple or yellow, etc., the hardness is 6.5-7, and the density is 3.03-3.22g / cm 3 . LiAl(SiO 3 ) 2 or Li 2 O·Al 2 o 3 4SiO2 2 , The theoretical lithium content is 3.75% (lithium oxide 8.04%). α-spodumene is rapidly transformed into β-spodumene when roasted to about 1000 °C.

[0003] At present, the methods for extracting lithium from lepidolite mainly include lime milk pressure cooking and so on. The lime milk pressure cooking method is to grind lepidolite to 200 meshes, directly add water and calcium hydroxide to cook in an autoclave, the pressure is generally 2.8MPa, the reaction time is 4 hours, and the decomposition rate r...