Method for preparing lithium metal through lithium contained minerals

A technology for lithium metal and minerals, applied in the field of lithium metal preparation from lithium-containing minerals, can solve problems such as long process, serious air pollution, and difficult temperature control

Active Publication Date: 2019-05-28
BEIJING OUFEI JINTAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the lithium in the spodumene is first extracted as lithium carbonate, and then converted into lithium chloride. The production cost is high. For every 1 ton of lithium produced, 5 tons of chlorine gas will be generated, which will seriously pollute the air; Lithium is made of lithium carbonate, the temperature is not easy to control, the process is long, and there are problems of low recovery rate and purity of lithium metal

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  • Method for preparing lithium metal through lithium contained minerals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] figure 1 Example 1 of the present invention is a flow chart for preparing lithium metal by taking spodumene as an example. After the spodumene is pulverized and ground, an auxiliary agent, a reducing agent and a catalyst are added to mix and press balls to obtain a mixed raw material, and then vacuum reduction is performed to obtain lithium metal. and tailings.

[0056] (1) According to dry spodumene raw material, light magnesia and aluminum-magnesium alloy in a weight ratio of 45:40:5, and add BaF 2 The mixed raw material is formed, and the mixed raw material is pressed into pellets under 50Mpa, and the particle size of the pellets made by pressing the mixed raw material is about 40mm. The added amount of magnesium fluoride is 2wt% of the amount of mixed raw materials. Light magnesium oxide MgO≥95wt%, SiO 2 ≤1.0wt%, P≤0.03wt%, S≤0.03wt%. The aluminum-magnesium alloy used is in powder form, the fineness is -120 mesh, and the chemical composition is Al: 10wt%, Mg: 90...

Embodiment 2

[0060] (1) According to the dry spodumene raw material, light magnesium oxide and aluminum-magnesium alloy, the weight ratio is 50:45:10, and MgF is added 2 and CaF 2 The mixture of the mixture forms a mixed raw material, which is pressed into pellets under 50Mpa; the particle size of the pellets made by pressing the mixed raw material is about 40mm. The added amount of fluoride is 5wt% of the amount of mixed raw materials. The aluminum-magnesium alloy used is in powder form, the fineness is -120 mesh, and the chemical composition is Al: 30wt%, Mg: 70wt%.

[0061] (2) Put the pellet material into the heating furnace, raise the temperature to 700°C at a heating rate of 15°C / min, keep the temperature constant for 60min, and maintain a vacuum of 1Pa; continue to raise the temperature, and raise the temperature to 1300°C at a heating rate of 15°C / min , and control the vacuum degree of the vacuum reactor to 1200Pa, until no more lithium vapor is generated, and keep the constant t...

Embodiment 3

[0064] (1) According to dry lepidolite raw material, light magnesia and aluminum-magnesium alloy, the weight ratio is 45:45:5 to form a mixed raw material, and the mixed material is pressed into pellets at 50Mpa; the pellet particle size of the mixed raw material is pressed About 40mm. The aluminum-magnesium alloy used is in powder form, the fineness is -120 mesh, and the chemical composition is Al: 30wt%, Mg: 70wt%.

[0065] (2) Add the pellets into the heating furnace, raise the temperature to 650°C at a heating rate of 13°C / min, keep the temperature constant for 40min, and maintain a vacuum of 1Pa; continue to heat up, and raise the temperature to 1250°C at a heating rate of 13°C / min , and control the vacuum degree of the vacuum reactor to 1150Pa, until no more lithium vapor is generated, and keep the constant temperature for about 3 hours; the heating furnace is an induction heating furnace for discontinuous production, and its fuel is gas.

[0066] (3) The reduced lithiu...

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Abstract

The invention provides a method for preparing lithium metal through lithium contained minerals, and belongs to the field of mineral smelting. The method comprises following steps that the lithium contained minerals, an assistant, a reducing agent and a catalyst are mixed, a mixed raw material is obtained, the reducing agent comprises one or multiple of elemental aluminum, elemental magnesium, elemental silicon, elemental calcium, calcium silicon alloy, aluminium magnesium alloy and silicon magnesium alloy, and the catalyst comprises on or multiple of BaF2, CaF2 and MgF2; under the vacuum condition, the mixed raw material is subjected to reduction, and lithium steam is obtained; the lithium steam is collected, and lithium metal is obtained; the BaF2, CaF2 and MgF2 serves as the catalyst, the structure of the lithium contained minerals is damaged, lithium oxide is separated out, reduction is facilitated, meanwhile, the catalyst enables the reduced lithium to be collected and distilled, and lithium steam is obtained; and the reducing agent, the assistant and the catalyst are added, and the recycling rate and the purity of the lithium metal are improved.

Description

technical field [0001] The invention relates to the technical field of mineral smelting, in particular to a method for preparing lithium metal from lithium-containing minerals. Background technique [0002] At present, consumer electronics products represented by batteries, notebook computers and mobile phones have a strong demand for lithium batteries, which is the main driving force for the growth of lithium metal demand. With the advancement and development of science and technology, people have higher and higher requirements for environmental protection, which promotes the development of electric vehicles, electric bicycles, and new energy vehicles. Because lead-acid batteries are heavy, inconvenient and easy to cause traffic accidents, and lead Pollution is taken seriously by the state. Compared with lead-acid batteries, lithium batteries have higher capacity, lighter weight and longer life. Due to the closure of a large number of lead-acid battery factories, the pace...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B5/04
Inventor 卢惠民
Owner BEIJING OUFEI JINTAI TECH CO LTD
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