Production method for high-purity lithium metal and special equipment thereof

Abstract

The invention relates to a preparation method for lithium metal. The production method for high-purity lithium metal comprises two steps of synthetic reaction and reducing reaction, the synthetic reaction comprises the steps that raw material lithium carbonate and kalk or aluminium hydroxide are mixed, then are put into a reaction vessel to be calcinated at the temperature of 650 to 850 DEG C, after carbon dioxide and moisture are removed, intermediate products are prepared and are sieved and set aside; the reducing reaction comprises the steps that duriron or aluminium powder are added into the intermediate products prepared during the synthetic reaction to be as reducing agent, after being mixed, the intermediate products are pressed into spherical or cylindrical, then reducing reaction is performed under the vacuum and high-temperature condition, and the lithium metal is prepared. The production method has the advantages that the flow of the synthetic reaction is simplified, the production efficiency is effectively improved, the product purity is greatly enhanced, no waste material is generated, the side product is lithium-containing compound, which can be directly applied to the electrolytic aluminum industry, and all the required raw materials can be solved internally.

Description

1. Technical field: [0001] The invention relates to metal preparation, especially a method for preparing metal lithium, and also relates to a synthesis reaction kettle. 2. Background technology: [0002] Lithium metal is the lightest metal in the world. Lithium is the metal with the most negative potential. It has the characteristics of the highest potential, electrochemical equivalent and the largest discharge capacity. It plays a very important role in modern industry and science and technology. It is widely used in electronics, Chemical industry, medicine, glass, rubber, ceramics, nuclear industry, aerospace, metal smelting, machinery manufacturing and other fields. For example, lithium-aluminum alloys and magnesium-lithium alloys produced with lithium metal are widely used in the aerospace industry in developed countries to replace aluminum-magnesium alloys due to their good fatigue resistance, high strength, good toughness, and light weight. Magnesium-lithium alloy is ...

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this method is that the chlorine gas pollution generated during electrolysis is serious, and the product quality is not easy to control, and the production cost is high.

The vacuum thermal reduction method uses lithium carbonate as a raw material. After high temperature heating, aluminum powder is used to reduce lithium metal. It has the advantages of short process, good product quality, and no environmental pollution. However, it also has the disadvantages of low recovery rate and complicated equipment structure. In particular, the process of synthesizing intermediate products is relatively long, such as figure 1 As shown, since the direct feed synthesis reaction is too intense and uncontrollable, the raw materials need to be pressed into agglomerates after mixing, and put into the reactor for synthesis reaction. Since the reaction of agglomerate materials is slow, the water and gas released from the reaction may be Reduce the bumping phenomenon, but there is a long reaction time (the reaction time is generally 12 hours), the insufficient problem of low reaction conversion rate, the obtained intermediate product has low purity, and needs to be crushed and then sieved before it can be used as the next reduction reaction raw material

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