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Process for preparing lithium carbonate by virtue of spodumene sulfuric acid method

A technology of spodumene and lithium carbonate, which is applied in the direction of lithium carbonate; High recovery rate, less lithium carryover, and improved precipitation rate

Inactive Publication Date: 2018-11-13
萍乡市拓源实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Looking at the current ore lithium extraction process, the lime sintering method has high energy consumption and a low recovery rate of lithium; the chlorination roasting method has a simple process and a high recovery rate, but the furnace gas is highly corrosive and requires high equipment. It is mainly used in the formation process of lepidolite; however, the current sulfuric acid method has always had the situation that the amount of lithium carried out after acid leaching is too high, which affects the recovery rate of lithium and is a serious waste of resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The composition of spodumene ore sample in the present embodiment is: the Li of 6.05wt% 2 O, 26.45wt% Al 2 o 3 , 3.05wt% Fe 2 o 3 , 1.28wt% K 2 O and 60.31wt% SiO 2 , and the rest are trace amounts of CaO, MgO and Na 2 O. Its process steps are as follows:

[0016] (1) Take the above-mentioned spodumene ore sample, spodumene, crush it, ball mill it, and sieve it to 178 μm, and mix it evenly to obtain the primary raw ore powder; then, the raw ore powder is roasted at 1000 ° C for 20 minutes in a program-controlled box-type electric furnace to obtain The primary roasted material contains a large amount of β-spodumene and a small amount of α-spodumene in the ore sample, indicating that the conversion is not complete;

[0017] (2) Grind the ore samples roasted through crystal transformation and pass through a 200 mesh sieve (aperture 74 μm); grind the gained ore samples to get 50 g, then mix evenly with 130% sulfuric acid (mass concentration is 93%), pack Porcelain ...

Embodiment 2

[0022] The composition of spodumene ore sample in the present embodiment is: the Li of 6.05wt% 2 O, 26.45wt% Al 2 o 3 , 3.05wt% Fe 2 o 3 , 1.28wt% K 2 O and 60.31wt% SiO 2 , and the rest are trace amounts of CaO, MgO and Na 2 O. Its process steps are as follows:

[0023] (1) Take the above-mentioned spodumene ore sample, spodumene, crush it, ball mill it, and sieve it to 178 μm, and mix it evenly to obtain the primary raw ore powder; then, the raw ore powder is roasted at 1050 ° C for 30 minutes in a program-controlled box-type electric furnace to obtain For the primary roasted material, only β-spodumene was found in the ore sample, and no α-spodumene was found, indicating that the conversion was complete;

[0024] (2) Grind the ore samples roasted through crystal conversion and all pass through a 200 mesh sieve (aperture 74 μm); grind the gained ore samples to get 50g, then mix evenly with 150% sulfuric acid (mass concentration is 93%), pack The porcelain boat is aci...

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Abstract

The invention discloses a process for preparing lithium carbonate by virtue of a spodumene sulfuric acid method, relating to steps for preparing a lithium sulfate leaching solution and causticizing the lithium sulfate leaching solution in the process for producing lithium carbonate by virtue of the spodumene sulfuric acid method. The process comprises the steps of carrying out crushing, ball milling, roasting, sulfuric acid roasting and leaching, and neutralizing acid liquid to a pH value of 6.5 in the leaching solution by virtue of CaCO3 so as to enable the leaching environment of lithium sulfate to be faintly acid, so that magnesium and calcium ions are effectively removed, the drag-out quantity of lithium is relatively low, the recovery rate of lithium is relatively high, the settling rate of lithium carbonate is increased to a great extent, the yield of lithium carbonate prepared by virtue of the spodumene sulfuric acid method is further increased, and resources are saved.

Description

technical field [0001] The invention relates to a method for extracting lithium carbonate from spodumene ore, in particular to a process for preparing lithium carbonate by a spodumene sulfuric acid method. Background technique [0002] my country has unique lithium resources, not only salt lake resources with high value, but also lithium ore with abundant reserves and high grade. At present, although the prospect of lithium extraction from salt lakes has a tendency to exceed lithium extraction from ores, in order to fully and effectively utilize lithium mineral resources in my country, it is still very important to study the process of extracting lithium carbonate from spodumene. [0003] Looking at the current ore lithium extraction process, the lime sintering method has high energy consumption and a low recovery rate of lithium; the chlorination roasting method has a simple process and a high recovery rate, but the furnace gas is highly corrosive and requires high equipmen...

Claims

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Application Information

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IPC IPC(8): C01D15/08
CPCC01D15/08
Inventor 曾国富张德生莫美荣
Owner 萍乡市拓源实业有限公司
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