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Method for extracting lithium from lepidolite concentrate

A lepidolite, lithium extraction technology, applied in the direction of lithium oxide;/hydroxide, lithium carbonate;/acid carbonate, etc., can solve the problem of material melting, low lithium grade, and easy formation of saturated double salt And other issues

Active Publication Date: 2017-05-31
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

[0103] 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%) according to the weight ratio 1:0.3:0.15, add 3% water of the total material and mix evenly, put it into a stainless steel pan, and roast it in a muffle furnace at 920°C for 2h (turn it every 30 minutes), and observe that the roasted material There is a tendency to soften and melt, but it is not melted, and a roasted material is obtained.

[0104] Step (2): The roasted material that obtains is ground to -180 order and accounts for 80% powder in the vibrating ore mill, after water is adjusted into ore slurry in reaction tank by the solid-liquid ratio of 1: 2, press ore again: acid ( Weight ratio) = 1: 0.5, add concentrated sulfuric acid without heating and react for 2h, then add limestone powder (CaCO3≥90%) to adjust the pH value of the solution to 5, then perform suction filtration, and wash the filter residue twice with wa...

Embodiment 2

[0109] 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%) according to the weight ratio 1:0.2:0.2, add 3% water of the total material and mix evenly, put it into a stainless steel pan, and roast it in a muffle furnace at 950°C for 2 hours (turn it every 30 minutes), and observe that the roasted material There was no tendency or phenomenon of softening and melting, and a roasted material was obtained. Subsequent process is the same as in Example 1, and the results are shown in Table 2.

Embodiment 3

[0111] Mix 2000kg of lepidolite concentrate with industrial grade CaSO 4 2H 2 O: Barite ore powder (containing BaSO 4 ≥90%) by weight ratio 1:0.3:0.15, add 3% water of the total material and mix evenly, put it into the special short kiln for smelting provided by Laibin Smelter of Liuzhou Huaxi Group, the size of the short kiln is ￠2655mm×3462mm, Add the material to be roasted from the middle of the short kiln, and roast it with gas. When the temperature rises to 920°C, keep it warm for 2 hours. It is observed that the roasted material does not melt, and the material is ground with a Raymond machine until - After 180 mesh accounts for 80%, take a comprehensive sample of 2.5 kg to obtain the roasted material. Subsequent process is the same as in Example 1, and the results are shown in Table 2.

[0112] Note: the batching ratio of embodiment 3, roasting temperature, time and follow-up process are all with embodiment 1. The roasting equipment is a short kiln, and the short kil...

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Abstract

The invention discloses a process for extracting lithium hydrate monohydrate and lithium carbonate by performing active roasting and sulfuric acid leaching on lepidolite concentrate. The method comprises the following steps: adding water into the lepidolite concentrate, calcium sulfate, barite powder or barium sulfate return slag and mixing; performing roasting in a preferable roasting furnace at a proper temperature for proper time; grinding and performing sulfuric acid leaching on a roasted material; performing primary purification, concentration and secondary purification on a leaching agent to obtain LiOH finished liquid; performing secondary crystallization and primary saturated liquid washing on the finished liquid to obtain a lithium hydrate monohydrate product; adding sodium carbonate for precipitating the lithium hydrate monohydrate crystallization mother liquor and washing liquid to obtain a lithium carbonate product. By adopting the process, lithium can be separated effectively from the lepidolite concentrate, and qualified lithium hydrate monohydrate and lithium carbonate products are produced. The process has the advantages of low energy consumption, less material flow, low production cost, low discharge capacity, high environmental friendliness, efficient realization of resource utilization, and capability of meeting 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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IPC IPC(8): C01D15/02C01D15/08
CPCC01D15/02C01D15/08C01P2006/80
Inventor 谭春波
Owner 谭春波
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