Method for extracting lithium from lepidolite concentrate

A lepidolite and lithium extraction technology, which is applied in the direction of lithium oxide;/hydroxide, lithium carbonate;/acid carbonate, etc., can solve the problems of easy formation of saturated double salt, melting of materials, and low lithium grade and other problems, to achieve the effect of solving the dust return of roasted materials

Active Publication Date: 2017-08-11
谭春波
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In view of the complex composition of lepidolite concentrate, low lithium grade, and high soluble impurities, there is an urgent need for a simple, reliable, and effective solution to the problem of material melting during high-temperature transformation of lepidolite, soluble impurities are easy to form saturated double salts, and low-concentration lithium ion precipitation efficiency is low. High recovery rate and low cost lithium extraction process

Method used

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  • Method for extracting lithium from lepidolite concentrate
  • Method for extracting lithium from lepidolite concentrate
  • Method for extracting lithium from lepidolite concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] Step (1): 2 kg of lepidolite concentrate (see Table 1 for composition): industrial grade CaSO 4 2H 2 O: Barite ore powder (containing BaSO 4 ≥90%): anthracite coal powder (calorific value Q=5000 kcal / kg) by weight ratio 1:0.3:0.15:0.1, add 3% water of the total material and mix evenly, and press it into a green ball of φ25mm in a small ball press machine , put it into a stainless steel pan, and roast it in a muffle furnace at 920°C for 2h (stirring once every 30 minutes). It was observed that the roasted pellets tended to soften and melt but did not melt, and the roasted pellets were obtained.

[0125] Step (2): The obtained roasted pellets are ground in a vibration mill to -180 mesh, accounting for 80% of the powder, and water is adjusted to a slurry in a reaction tank at a solid-to-liquid ratio of 1:2, and then mixed according to ore:acid (weight ratio) = 1:0.5 ratio, add concentrated sulfuric acid and react without heating for 2 hours, then add limestone powder (Ca...

Embodiment 2

[0130] Compared with Example 1, the difference is that in step (1), lepidolite concentrate (see Table 1 for composition) 2kg: industrial grade CaSO 4 2H 2 O: the BaSO produced by the experiment of Example 1 4 Return slag (including BaSO 4 ≥90%), anthracite coal powder (calorific value Q=5000 kcal / kg), add 3% water of the total material in a weight ratio of 1:0.2:0.2:0.04, mix evenly, and press into a green ball of φ25mm in a small ball press , put it into a stainless steel pan, and roast it in a muffle furnace at 950° C. for 2 hours (stirring once every 30 minutes). It was observed that the roasted material did not soften and melt, and the roasted material was obtained. Subsequent process is the same as in Example 1, and the results are shown in Table 2.

Embodiment 3

[0132] Compared with Example 1, the difference is that in step (1), the calcination temperature is 850°C. Subsequent process is the same as in Example 1, and the results are shown in Table 2.

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Abstract

The invention discloses a technology for extracting lithium hydroxide monohydrate and lithium carbonate by activating, roasting and leaching lepidolite concentrate with sulfuric acid. The technology comprises the following steps: adding water into lepidolite concentrate and calcium sulfate, barite powder or barium sulfate slag and carbon fuel, pressing and acquiring a green ball; roasting in a shaft kiln under an appropriate temperature and at appropriate time; milling the roasted ball; leaching with sulfuric acid; primarily purifying the leachate, concentrating and secondarily purifying, thereby acquiring a finished LiOH solution; secondarily crystalizing and firstly washing the finished solution with saturated solution, thereby acquiring a lithium hydroxide monohydrate product; adding sodium carbonate into lithium hydroxide monohydrate crystallization mother liquor and scrubbing solution and precipitating, thereby acquiring the lithium carbonate product. According to the technology, the lithium can be effectively separated from the lepidolite concentrate and the qualified lithium hydroxide monohydrate and lithium carbonate products can be produced. The technology has the advantages of less energy consumption, few flowing materials, low production cost, less discharge capacity, environmental protection, capability of efficiently realizing the recycling comprehensive utilization and suitability for industrial production.

Description

technical field [0001] The invention belongs to the technical field of extracting valuable lithium compounds from lithium ores, in particular to a process for preparing lithium hydroxide monohydrate and lithium carbonate from lepidolite concentrate through activation roasting and sulfuric acid leaching. Background technique [0002] Lithium is widely used in emerging fields such as battery industry, ceramic industry, glass industry, aluminum industry, lubricant, refrigerant, nuclear industry and optoelectronic industry. Among them, lithium hydroxide monohydrate and lithium carbonate are the two most important lithium compounds, and other industrial lithium products are basically the downstream products of these two compounds. [0003] The lepidolite ore reserves in Yichun City, Jiangxi Province rank first in Asia, accounting for more than 30% of the country's lithium reserves. At present, except for a small amount of lepidolite ore used to extract lithium, most of them are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02C01D15/08
CPCC01D15/02C01D15/08C01P2006/80
Inventor 谭春波
Owner 谭春波
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