Comprehensive treatment process of lithium slag

Abstract

The invention discloses a comprehensive treatment process of lithium slag, which is used for comprehensively utilizing waste slag generated after lithium is extracted by a lithium ore sulfuric acid method process by adopting an ore grinding treatment technology, a weak-strong magnetic separation iron removal technology, a solid-liquid two-phase desulfurization technology and a multi-stage circulating water classification circulation technology. According to the method, iron-containing and sulfur-containing impurity components and silicon-aluminum components can be effectively separated, and conditions are created for producing high-added-value products such as silicon-aluminum micro powder and tantalum-niobium concentrate by comprehensively utilizing the lithium slag. And meanwhile, the problems of coarse product granularity, low yield, valuable metal waste, wastewater discharge and the like in the existing production process are solved, and the method has a relatively good popularization and application prospect.

Description

technical field [0001] The invention relates to an industrial solid waste treatment technology, in particular to a comprehensive treatment process for lithium slag, which belongs to the field of comprehensive utilization of waste slag produced after lithium extraction by sulfuric acid process of lithium ore. Background technique [0002] At present, with the rapid development of my country's lithium battery industry, the output of metallurgical solid waste-lithium slag is also increasing, and the resulting environmental pollution problems are also emerging. Therefore, the comprehensive utilization of lithium slag The demand is also becoming more and more urgent. [0003] At this stage, most of the research and application of comprehensive utilization of lithium slag remain in the field of building materials, and the added value of products is low. Recently, with the deepening of research, there have been application examples of high-value utilization of lithium slag. [000...

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Problems solved by technology

[0006] However, the existing technology of utilizing lithium slag to produce silicon-aluminum powder also has the following problems in the actual production process: 1, due to the lack of grinding treatment, the produced silicon-alumina powder has a relatively coarse particle size, and it is used as a raw material for glass fiber production. The replacement rate of natural pyrophyllite is not high; 2. Due to the insufficient dissociation of iron-containing components in lithium slag, they will form conjoined bodies with silicon-aluminum components. After strong magnetic separation, silicon-aluminum components will be mixed with iron-containing The components enter the magnetic separation tailings together, which reduces the output of silicon-aluminum powder; 3. The ferromagnetic components in the raw materials are not removed in advance, and will be closely attached to the magnetic medium after entering the strong magnetic machine, which will easily lead to strong magnetic 4. The content of tantalum and niobium in the magnetic products after strong magnetic separation has reached the industrial grade but has not been rationally utilized; 5. The iron content of the silicon-aluminum micropowder increases due to the wear of the over-current iron-containing parts in the product dehydration system; 6. , Since the amount of sulfur and fine mud in the ring water produced by the dehydration system gradually increases with the production, it needs to be discharged periodically, and it is impossible to truly achieve zero discharge of wastewater

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