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Method and device for extracting lithium from lapidolite by chloridizing roasting method

A technology for lepidolite and lithium extraction, applied in the field of metallurgy, can solve the problems of insufficient chlorination of lithium concentrate, low lithium recovery rate, low roasting temperature, etc., so as to increase the amount of water treatment and wastewater discharge, and the utilization rate of equipment. Low, high energy consumption effect

Active Publication Date: 2010-07-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the roasting temperature is too low, the lithium concentrate cannot be fully chlorinated, and the lithium recovery rate is low; if the temperature is too high, the clinker will melt and bond, and form rings in the rotary kiln, making the operation difficult

Method used

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  • Method and device for extracting lithium from lapidolite by chloridizing roasting method
  • Method and device for extracting lithium from lapidolite by chloridizing roasting method
  • Method and device for extracting lithium from lapidolite by chloridizing roasting method

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Experimental program
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Effect test

Embodiment 1

[0025] Will Li 2Lepidolite, calcium chloride, sodium hydroxide and composite binder with O content of 4% are mixed in a mass ratio of 1:0.8:0.05:0.08 to make green pellets of 5-12 mm in size, wherein the composite binder is A mixture of sodium humate, quicklime, sodium carbonate, and potassium carbonate. The above-mentioned green pellets were calcined at 1100°C for 4 hours, and after the furnace gas was cooled, the dust containing a mixture of lithium chloride, potassium chloride, sodium chloride, rubidium chloride and cesium chloride was collected. The above-mentioned soot is leached with a solution containing sodium carbonate and potassium carbonate. The sum of the contents of sodium carbonate and potassium carbonate is greater than 120% of the theoretical amount required to convert lithium in the soot into lithium carbonate. Potassium, sodium, rubidium and cesium enter the solution. Lithium is converted into lithium carbonate, and lithium carbonate solid is obtained after ...

Embodiment 2

[0029] Will Li 2 Lepidolite, calcium chloride, sodium hydroxide and composite binder with an O content of 3.1% are mixed in a mass ratio of 1:0.5:0.03:0.3 to produce green pellets of 5-12 mm in size, wherein the composite binder is A mixture of sodium humate, quicklime, sodium carbonate, and potassium carbonate. The above-mentioned green pellets were roasted at 1400°C for 0.5 hours in a "return" shaped orbital roaster, and collected after the furnace gas was cooled to obtain lithium chloride, potassium chloride, sodium chloride, rubidium chloride and cesium chloride Mixture of fumes. Use a solution containing sodium carbonate and potassium carbonate to leach the above-mentioned dust. The content of sodium carbonate and potassium carbonate is greater than 120% of the theoretical amount required to convert lithium in the dust into lithium carbonate. Potassium, sodium, rubidium and cesium enter the solution, and the lithium is converted It is lithium carbonate, and lithium carb...

Embodiment 3

[0033] Will Li 2 Lepidolite, calcium chloride, sodium hydroxide and composite binder with an O content of 4.9% are mixed in a mass ratio of 1:1:0.05:0.1 to produce green pellets of 5-12 mm in size, wherein the composite binder is A mixture of sodium humate, quicklime, sodium carbonate, and potassium carbonate. The above-mentioned green pellets were roasted at 1300°C for 5 hours in a "return" shaped orbital roaster, and collected after the furnace gas was cooled to obtain lithium chloride, potassium chloride, sodium chloride, rubidium chloride and cesium chloride Mixture of fumes. Use a solution containing sodium carbonate and potassium carbonate to leach the above-mentioned dust. The content of sodium carbonate and potassium carbonate is greater than 120% of the theoretical amount required to convert lithium in the dust into lithium carbonate. Potassium, sodium, rubidium and cesium enter the solution, and the lithium is converted It is lithium carbonate, and lithium carbonat...

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Abstract

The invention discloses a method and a device for extracting lithium, which is used for preparing lithium carbonate, from a lapidolite ore by a chloridizing roasting method. The method comprises the following steps of: firstly, mixing the lapidolite ore, calcium chloride and sodium hydroxide with a compound bonding agent for pellet fabrication; secondly, performing chloridizing roasting in a square-frame shaped track type roasting furnace; thirdly, leaching out soot dust by using solution containing sodium carbonate and potassium carbonate to ensure that potassium, sodium, rubidium and cesium enter the solution and convert the lithium into lithium carbonate; fourthly, filtering the mixture to obtain a lithium carbonate solid, and circularly using the filtrated mother liquor to leach out the soot dust; fifthly, when an alkali metal salt is close to be saturated, indirectly heating the filtrated mother liquor by using the residual heat of the gas in the roasting furnace to evaporate part of water; sixthly, passing CO2 into the filtrated mother liquor to perform carbonation; and seventhly, performing cooling crystallization to separate out a mixed salt of the sodium carbonate and the potassium carbonate, returning part of the mixed salt which is used as an auxiliary material mixed and roasted with lapidolite for cyclic utilization, using another part of the mixed salt as a carbonate reagent needed in dissolution, and using the rest part of the mixed salt as byproducts of the sodium carbonate and the potassium carbonate. The method has the advantages of high lithium recovery rate, good material comprehensive utilization, large equipment productivity, high production efficiency, small water consumption in the process and less wastewater discharge.

Description

technical field [0001] The invention relates to a method and equipment for extracting lithium from lepidolite, belonging to the field of metallurgy. Background technique [0002] Lithium and lithium salts are important raw materials for high-energy green batteries, aerospace, and nuclear fusion power generation. They are known as "important elements that drive the world forward", and their demand is increasing day by day. my country is rich in lepidolite resources, among which Li 2 The O content is generally around 4%. At present, the extraction of lithium from lepidolite mainly includes lime roasting, pressure cooking, sulfuric acid, and chlorination roasting. [0003] (1) Lime roasting method. The lime method is used to process lepidolite to produce lithium salts, which is to mix limestone with lepidolite in a ball mill at a ratio of 3:1 after crushing to prepare a qualified raw slurry, and the qualified slurry is put into a rotary kiln to roast the clinker; Water quen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12
Inventor 郭华军李新海颜群轩王志兴胡启阳彭文杰张云河
Owner CENT SOUTH UNIV
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