Method for preparing lithium carbonate with byproduct analcime by NaOH decomposition of spodumene

A by-product technology of analcite and spodumene, applied in the direction of lithium carbonate;/acid carbonate, aluminum silicate, silicate, etc., can solve the problem of high cost, achieve low raw material cost and reduce cost , The effect of simple process

Inactive Publication Date: 2017-11-24
昊青薪材(北京)技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention provides a simple and efficient method for preparing analcime by using spodumene, directly using spodumene as raw material to prepare lithium lithium carbonate and analcime, providing a new application for spodumene, and improving the utilization rate of spodumene , to solve the problem of high cost in the process of preparing lithium salt from spodumene

Method used

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  • Method for preparing lithium carbonate with byproduct analcime by NaOH decomposition of spodumene
  • Method for preparing lithium carbonate with byproduct analcime by NaOH decomposition of spodumene
  • Method for preparing lithium carbonate with byproduct analcime by NaOH decomposition of spodumene

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Embodiment 1

[0024] The spodumene ore is crushed, ball milled and beneficiated so that the particle size is less than 75 μm, and Li in the spodumene powder 2 O=7.0%; Weigh 8g spodumene, 2g sodium hydroxide, 80mL water, mix sodium hydroxide and water uniformly to form a sodium hydroxide solution, then add spodumene to the sodium hydroxide solution, and stir to form Mix the slurry; put it into a high-pressure reactor, heat it, react it hydrothermally at 240°C for 240 minutes, cool it down to room temperature naturally, filter it, wash it 4-5 times until the pH of the solution is 7-8, put the filter cake into Dry in an oven at 110±5°C for 12 hours to obtain analcime product; pass CO into the obtained filtrate 2 , CO 2 The ventilation flow rate is 0.2L / min, the carbonation temperature is 40°C, and the carbonation time is 90min. The obtained filter cake is washed and dried at 110±5°C for 12h, which is the lithium carbonate product. Synthetic analcime productive rate is 91%, and its product co...

Embodiment 2

[0030] The spodumene ore is crushed, ball milled and beneficiated so that the particle size is less than 75 μm, and Li in the spodumene powder 2 O=7.0%; Weigh 8g spodumene, 3g sodium hydroxide, 120mL water, mix sodium hydroxide and water uniformly to form a sodium hydroxide solution, then add spodumene to the sodium hydroxide solution, and stir to form Mix the slurry; put it into a high-pressure reactor, heat it, react it hydrothermally at 260°C for 120 minutes, cool it down to room temperature naturally, filter it, wash it 4-5 times until the pH of the solution is 7-8, put the filter cake into Dry in an oven at 110±5°C for 12 hours to obtain the analcime product. Into the obtained filtrate was passed into CO 2 , CO 2 The ventilation flow rate is 0.4L / min, the carbonation temperature is 60°C, and the carbonation time is 60min. The obtained filter cake is washed and dried at 110±5°C for 12h, which is the lithium carbonate product. The synthetic analcime productive rate is 90...

Embodiment 3

[0036] The spodumene ore is crushed, ball milled and beneficiated so that the particle size is less than 75 μm, and Li in the spodumene powder 2 O=7.0%; Weigh 8g of spodumene, 4g of sodium hydroxide, and 160mL of water, first mix the sodium hydroxide and water to form a sodium hydroxide solution, then add the spodumene powder into the sodium hydroxide solution, and stir Make a mixed slurry; put it into a high-pressure reactor, heat it, and react it hydrothermally at 280°C for 60 minutes, cool it down to room temperature naturally, filter it, and wash it 4-5 times until the pH of the solution is 7-8. Put it into an oven and dry at 110±5°C for 12 hours to obtain analcime product. Into the obtained filtrate was passed into CO 2 , CO 2 The ventilation flow rate is 0.5L / min. The carbonation temperature is 80°C, and the carbonation time is 20 minutes. The resulting filter cake is washed and dried at 110±5°C for 12 hours, and the lithium carbonate product is obtained. The synthet...

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Abstract

The invention discloses a method for preparing lithium carbonate with byproduct analcime by NaOH decomposition of spodumene. The process is as follows: crushing and grinding spodumene ore to powder with a particle size of less than 74 mu m, uniformly mixing the spodumene powder with sodium hydroxide and water, then hydrothermally reacting at 240~280 DEG C for 60 min~240 min to obtain analcime and a lithium-containing solution, filtering the resulting mixture, washing and drying to obtain the analcime product, carbonating filtrate to obtain a lithium carbonate precipitate, filtering, washing and drying to obtain the lithium carbonate product. The process has no "three wastes" emissions, spodumene resources are efficiently used, lithium element in the spodumene resources is transformed into the lithium carbonate, silicon and aluminum elements in the spodumene resources are transformed into the analcime, meanwhile most of Li2O in the spodumene is dissolved out, the cost of lithium salt preparation is reduced, and the method is easy to promote and implement.

Description

technical field [0001] The invention belongs to lithium salt preparation and molecular sieve hydrothermal synthesis technology, and more specifically relates to a method for preparing lithium carbonate by-product analcime by decomposing spodumene with NaOH. Background technique [0002] Spodumene, also known as α-spodumene, can be transformed into β-spodumene with higher activity above 720°C, and has thermal cracking properties. It is one of the most commonly used lithium-containing mineral resources in the world. As the raw material of lithium chemical products, it is widely used in lithium chemical industry, glass and ceramic industries, and enjoys the reputation of "industrial monosodium glutamate". Lithium chemical raw materials are mainly used to produce lithium carbonate, but compared with lithium extraction in brine, the process cost is high, which is not conducive to industrial production. Analcime is a material with good adsorption performance, widely used in sewag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01B33/26
CPCC01D15/08C01B33/28C01P2002/72C01P2006/80
Inventor 张盼姚文贵罗蓓蓓
Owner 昊青薪材(北京)技术有限公司
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