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Method for acquiring lithium carbonate in zinnwaldite

A technology of iron lepidolite and lithium carbonate, which is applied in the direction of lithium carbonate; Effect of production cost reduction

Active Publication Date: 2015-05-27
湖南紫金锂业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to, aiming at the defects of low extraction efficiency of potassium, rubidium and cesium existing in the prior art, a method for obtaining lithium carbonate from iron lepidolite is proposed, which can increase lithium, potassium, rubidium and cesium elements recovery rate

Method used

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  • Method for acquiring lithium carbonate in zinnwaldite
  • Method for acquiring lithium carbonate in zinnwaldite
  • Method for acquiring lithium carbonate in zinnwaldite

Examples

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Embodiment 1

[0045] Get the iron lepidolite concentrate 1kg containing the main components in Table 1 and the roasting agent of 1.5Kg to carry out dry ball milling and mix, wherein roasting agent is made of Na 2 SO 4 , CaCl 2 , CaCO 3 and NaOH, the mass ratio of each component is 0.4:0.2:0.1:0.1; the mixed mixture is roasted at 850°C for 15 minutes to obtain clinker; the clinker is crushed and dissolved in a ball mill, and the clinker is crushed The particle size is 250 mesh, water is used as the leaching agent, the clinker and water are subjected to the first-stage leaching at a solid-to-liquid ratio of 0.5:1, the leaching temperature is 60°C, and the leaching time is 30 minutes; the fourth-stage countercurrent washing obtains the extract; The extract is filtered to obtain the leachate and leach residue, Li in the leachate 2 O concentration is about 20g / L. Then add Li in the leach solution 2 Stir with sodium hydroxide with an excess of 5% O content, purify and remove impurities, and ...

Embodiment 2

[0047] Get the roasting agent that contains the iron lepidolite concentrate 1kg and 1Kg of the main components in Table 1 to carry out dry ball milling and mix, wherein the roasting agent is made of Na 2 SO 4 , CaCl 2 , CaCO 3 and NaOH, the mass ratio of each component is 0.5:0.1:0.3:0.15; the mixed mixture is roasted at 900°C for 30 minutes to obtain clinker; the clinker is crushed and dissolved in a ball mill, and the clinker is crushed The particle size is 200 mesh, water is used as the leaching agent, clinker and water are subjected to the first-stage leaching according to the solid-to-liquid ratio of 2:1, the leaching temperature is 20°C, and the leaching time is 5 minutes; the fourth-stage countercurrent washing obtains the extract; The extract is filtered to obtain the leachate and leach residue, Li in the leachate 2 O concentration is about 10g / L. Then add Li in the leach solution 2 Stir with sodium hydroxide with an excess of 5% O content to purify and remove imp...

Embodiment 3

[0049] Get the iron lepidolite concentrate 1kg containing the main components in Table 1 and carry out the dry method ball milling mixing with 1Kg roasting agent, wherein roasting agent is made of Na 2 SO 4 , CaCl 2 , CaCO 3 Composed of NaOH and NaOH, the mass ratio of each component is 1:0.8:0.25:0.05; the mixed mixture is roasted at 1100°C for 15 minutes to obtain clinker; the clinker is crushed and dissolved in a ball mill, and the clinker is crushed The particle size is 220 mesh, water is used as the leaching agent, the clinker and water are subjected to the first-stage leaching at a solid-to-liquid ratio of 3:1, the leaching temperature is 90°C, and the leaching time is 80 minutes; the fourth-stage countercurrent washing is used to obtain the extract; The obtained extract is filtered to obtain the leachate and leach residue, and Li in the leachate 2 O concentration is about 5g / L. Then add Li in the leach solution 2 Stir with sodium hydroxide with an excess of 5% O co...

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Abstract

The invention discloses a method for acquiring lithium carbonate in zinnwaldite, which comprises the following steps: mixing zinnwaldite and a calcination agent, then roasting, using water for leaching to obtain a leachate, purifying the leachate and removing impurities, refrigerating and separating sodium out, concentrating, and adding sodium carbonate in a concentrate to obtain lithium carbonate precipitation and a solution containing potassium, rubidium and caesium. The method can increase the extraction rates of lithium, potassium, rubidium and caesium in zinnwaldite concentrate.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for obtaining lithium carbonate from iron lepidolite. Background technique [0002] Iron Lepidolite Concentrate Li 2 The O content is generally 2-3%, which belongs to low-grade refractory lithium ore resources, and is also rich in potassium, rubidium, and cesium. How to develop and utilize iron lepidolite is of great significance to the development of my country's lithium industry. [0003] At present, there are reports abroad that calcium sulfate and calcium hydroxide are used to roast lithium carbonate ore from iron lepidolite. In this method, iron lepidolite, calcium sulfate, and calcium hydroxide are roasted at 975°C for 1 hour at a ratio of 6:4.2:2.0. The leaching rate of lithium is 93%, but the extraction efficiency of potassium, rubidium and cesium is extremely low. Due to the low grade of lithium oxide in iron lepidolite, it is necessary to comprehensively deve...

Claims

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Application Information

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IPC IPC(8): C01D15/08
Inventor 邓新荣谢勇肖松文谢美求赵卫夺
Owner 湖南紫金锂业有限公司
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