Method for preparing lithium carbonate through thermal reduction of spodumene

A spodumene, lithium carbonate technology, applied in lithium carbonate;/acid carbonate, cement production and other directions, can solve the problems of high recovery and processing cost, low value of sodium sulfate, poor market competitiveness, etc. High utilization value, simple process and good product quality

Inactive Publication Date: 2021-06-22
SICHUAN UNION SHINE NEW ENERGY SCI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Its production process is complex, material consumption is large, and lithium utilization rate is low (82-86%), make its production cost high (up to 4-4.5 ten thousand yuan / ton, and the current market price of industrial grade lithium carbonate product is 4.0-43,000 yuan / ton)
[0005] (2) A large amount of sulfuric acid mist is produced during its high-temperature roasting process, causing great environmental pollution
[0006] (3) There are many slags and by-product sodium sulfate (1 ton of lithium carbonate produces about 8 tons of slag and 2 tons of sodium sulfate), the value of slag and by-product sodium sulfate is low, the cost of recycling is high, and the environmental load is large
Therefore, this traditional spodumene lithium carbonate production method has high cost and poor market competitiveness

Method used

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  • Method for preparing lithium carbonate through thermal reduction of spodumene
  • Method for preparing lithium carbonate through thermal reduction of spodumene
  • Method for preparing lithium carbonate through thermal reduction of spodumene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Take the α-type spodumene concentrate (which contains Li 2 O=6%) 1.0kg, with lime (its CaO content is 90%, particle size is 60-100um), composite reducing agent (composed of high-silicon ferrosilicon, aluminum powder, aluminum-silicon powder in a mass ratio of 1:0.1 -0.5:0.1-0.5 composition mixing) according to the mass ratio = 1:0.12:1.0, the total amount of solids added is 2.12kg, after the solids are mixed evenly, press to make dough, the size is 2.0cm in diameter and 1.0cm in thickness The cylindrical flakes are loaded into a graphite crucible sprayed with a ceramic anti-corrosion layer, and then the graphite crucible is placed in a special electric heating reduction furnace. Vacuumize the reduction furnace, control its absolute pressure to 15.0 Pa, turn on electricity to heat, control the temperature in the furnace to 900°C, and heat reduction time to 10 hours, then stop heating, release pressure, and naturally cool to normal temperature and pressure. Open the furn...

Embodiment 2

[0056] Get particle size and be-200 order, grade is 6.0% spodumene concentrate (it contains 2 O=6%) 1.0kg, with lime (it contains 95% CaO content, particle size is 60-100um), composite reducing agent (composed of high silicon ferrosilicon, aluminum powder, aluminum silicon powder is 1:0.1- 0.5: 0.1-0.5 (made by mixing) = 1: 0.3: 1.0 (mass ratio), the total amount of solids added is 2.3kg, after the solids are mixed evenly, press to make dough, its size is 2.0cm in diameter and 1.0cm in thickness Cylindrical flakes are loaded into a graphite crucible sprayed with a ceramic anti-corrosion layer, and then the graphite crucible is placed in a special reduction furnace (electric heating). Vacuumize the reduction furnace, control its absolute pressure to 8.0 Pa, turn on electricity to heat, control the temperature in the furnace to 1000°C, and heat reduction time to 10 hours, then stop heating, release pressure, and naturally cool to normal temperature and pressure. Open the furnac...

Embodiment 3

[0058] Get particle size and be-200 order, grade is 6.0% spodumene concentrate (it contains 2 O=6%) 1.0kg, with lime (it contains 95% CaO content, particle size is 60-100um), composite reducing agent (composed of high silicon ferrosilicon, aluminum powder, aluminum silicon powder is 1:0.1- 0.5: 0.1-0.5 (made by mixing) = 1: 0.5: 1.0 (mass ratio), the total amount of solids added is 2.5kg, after the solids are mixed evenly, press to make dough, the size of which is 2.0cm in diameter and 1.0cm in thickness Cylindrical flakes are loaded into a graphite crucible sprayed with a ceramic anti-corrosion layer, and then the graphite crucible is placed in a special reduction furnace (electric heating). Vacuumize the reduction furnace, control its absolute pressure to 5.0 Pa, turn on electricity to heat, control the temperature in the furnace to 1100°C, and heat reduction time to 10 hours, then stop heating, release pressure, and naturally cool to normal temperature and pressure. Open t...

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Abstract

The invention relates to the technical field of lithium carbonate production, in particular to a method for preparing lithium carbonate through thermal reduction by taking alpha-type spodumene as a raw material. The method comprises the following steps: mixing alpha-type spodumene concentrate powder with a reducing agent and a flux inhibitor, carrying out reducing in a reduction furnace under vacuum and high-temperature conditions to reduce lithium in spodumene into metal lithium steam, and condensing to obtain metal lithium and reduced spodumene slag containing the metal lithium and lithium oxide; leaching spodumene slag containing metal lithium and lithium oxide with water to obtain leached slag and slurry; and precipitating the leaching residues and the slurry, removing calcium, filtering to obtain a filtrate which is a lithium carbonate raw material solution, and concentrating and precipitating lithium to produce a battery-grade or high-purity lithium carbonate product. The new method is a green and environment-friendly technology, production of high-risk chemical chlorine and use of sulfuric acid in the prior art are avoided, and the environmental load is small; environmental pollution and solid waste emission are avoided, the environmental benefit is high, and the safety is high.

Description

technical field [0001] The invention relates to the technical field of lithium carbonate production, in particular to a method for preparing lithium carbonate by thermal reduction of α-type spodumene as a raw material. Background technique [0002] With the rapid development of lithium-ion batteries, a new energy source, the global demand for lithium products is growing at an average annual rate of 15-20%. Lithium carbonate is the most important lithium source for lithium batteries, and its production technology has become one of the key technologies in the development of this field, and it has also become a global technology research and development hotspot. [0003] At present, the global lithium carbonate production technology is generally produced by sulfuric acid acidification roasting method, that is, spodumene is used as raw material, through calcination transformation, crushing, mixing of concentrated sulfuric acid, acidification roasting, leaching, purification, fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C04B7/147
CPCC01D15/08C01P2006/80C04B7/147Y02P40/10
Inventor 钟辉干勇杨培
Owner SICHUAN UNION SHINE NEW ENERGY SCI TECH CO LTD
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