Method for extracting lithium from spodumene concentrate through suspension roasting

Abstract

The invention discloses a method for extracting lithium from spodumene concentrate through suspension roasting. The method comprises the following steps: (1) grinding the spodumene concentrate; (2) introducing mixed gas into the bottom of a suspension roasting device; heating the suspension roasting furnace to 1000-1100 DEG C; (3) conveying the mineral powder to the suspension roasting furnace, suspending under the action of airflow, heating and converting the crystal form to generate a roasted material; (4) grinding the roasted material, mixing with a sulfuric acid solution, and acidifying and roasting at 190-220 DEG C; (5) mixing the acidified material with water, stirring and soaking in water; (6) filtering and separating the water leaching material; (7) adjusting the pH value of the filtrate to 7-8, filtering, and filtering the secondary filtrate and the filtrate with the pH value adjusted to be greater than or equal to 13; (8) adding a sodium carbonate solution into the third filtrate to generate Li2CO3 precipitate; and washing the filtered solid phase with hot water and then drying. The method is simple in technological process, large in equipment treatment capacity, low in energy consumption, high in leaching rate, high in product purity, capable of easily controlling all steps, energy-saving and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a method for extracting lithium by suspending roasting spodumene concentrate. [0002] technical background [0003] With the development of new energy vehicles and electronic products in recent years, the demand for lithium is increasing. As one of the important lithium resources, spodumene has attracted extensive attention on how to efficiently extract lithium from spodumene; currently, the lithium extraction methods of spodumene include lime method, sulfuric acid method, pressure cooking method and chloride method, etc. These methods have high energy consumption, low lithium leaching rate, and large equipment loss. Therefore, developing a high-efficiency and low-consumption spodumene lithium extraction method for spodumene minerals has important strategic significance for the insufficient supply of lithium resources. [0004] Patent CN201410217808.5 relates to a spo...

AI Technical Summary

Problems solved by technology

As one of the important lithium resources, spodumene has attracted extensive attention on how to efficiently extract lithium from spodumene; currently, the lithium extraction methods of spodumene include lime method, sulfuric acid method, pressure cooking method and chloride method, etc. These methods have high energy consumption, low lithium leaching rate, and large equipment loss. Therefore, developing a high-efficiency and low-consumption spodumene lithium extraction method for spodumene minerals has important strategic significance for the insufficient supply of lithium resources.

[0004] Patent CN201410217808.5 relates to a spodumene concentrate sulfuric acid process to produce lithium carbonate, which proposes to prepare spodumene acid clinker by calcining in a rotary kiln, and leaching the acid clinker through heavy calcium solution; this scheme can realize lithium concentrate Lithium is extracted from ore, but the rotary kiln is used as the calcination equipment, which has low processing capacity, large steam consumption, and high energy consumption. At the same time, due to the high temperature required for spodumene roasting, there is also the problem of melting rings

[0005] Patent 201410038273.5 relates to a process for producing lithium carbonate from spodumene. It proposes to use preliminary roasting and acid roasting to obtain acidified clinker. The acidified clinker is reacted with carbon dioxide in a hydrogenation reactor, and lithium carbonate is prepared after removing impurities by resin adsorption. ; This scheme can realize the extraction of lithium from spodumene, but the impurity removal of the carbonization solution is complicated, and a selective resin ion exchange device is required, which has problems such as high cost and low efficiency.

Images