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Method for preparing lithium carbonate through extracting lithium from lithium ore

A technology of lithium carbonate and lithium ore, applied in the direction of lithium carbonate; The effect of reducing production cost and simple process

Inactive Publication Date: 2014-03-26
薛彦辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method is better than the lime sintering method, there are still the following problems: the one is that the consumption of potassium sulfate is large, and the cost of potassium sulfate is 4 to 5 times that of limestone, resulting in higher production costs; the other is that due to the addition of potassium sulfate, The melting point of the charge is lowered, and partial melting and sintering are very easy to occur, so that the leaching rate of lithium is greatly reduced
[0011] It can be seen that the current methods of extracting lithium from ores at home and abroad are roasting at high temperature, and then leaching and crystallizing, which have the characteristics of high energy consumption and complicated processes.

Method used

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  • Method for preparing lithium carbonate through extracting lithium from lithium ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Put 1000g of spodumene powder crushed to 80-200 mesh into the reactor, add 1000ml of fluosilicic acid with a concentration of 50% by mass, heat to 90°C, and react for 1 hour;

[0032] (2) filter the reaction product of step (1), and filter the gained solid to join in the defluorination reactor;

[0033] (3) adding mass percentage concentration to the defluorination reactor is 50% sulfuric acid to carry out defluorination reaction, and the mass ratio of solid reactant and sulfuric acid is 1: 0.8, and the reaction time is 4 hours;

[0034] (4) Filter the reaction product obtained in step (3), add the obtained solid into a dissolving kettle, add water in a ratio of 1:1 by mass, heat to boiling, stir and dissolve for 30 minutes;

[0035] (5) filter the reaction product obtained in step (4) with a filter press, and send the resulting filtrate into a neutralization tank, and add ammonia water with a mass percentage concentration of 5% to adjust the pH value to 4;

[0036...

Embodiment 2

[0038] (1) Put 1000g of lepidolite powder crushed to 80-200 mesh into the reaction kettle, add 10000ml of fluosilicic acid with a concentration of 10% by mass, heat to 120°C, and react for 3 hours;

[0039] (2) filter the reaction product of step (1), and filter the gained solid to join in the defluorination reactor;

[0040] (3) adding mass percentage concentration to the defluorination reactor is 98% sulfuric acid to carry out defluorination reaction, and the mass ratio of solid reactant and sulfuric acid is 1: 0.1, and the reaction time is 0.5 hour;

[0041] (4) Filter the reaction product obtained in step (3), add the obtained solid into a dissolving kettle, add water in a ratio of 1:5 by mass, heat to boiling, stir and dissolve for 2 minutes;

[0042] (5) filter the reaction product obtained in step (4) with a filter press, send the obtained filtrate into a neutralization tank, add ammonia water with a mass percentage concentration of 30% to adjust the pH value to 6;

[...

Embodiment 3

[0045](1) Put 1000g of lithium feldspar powder crushed to 80-200 mesh into the reactor, add 3000ml of fluosilicic acid with a concentration of 40% by mass, heat to 100°C, and react for 1.5 hours;

[0046] (2) filter the reaction product of step (1), and filter the gained solid to join in the defluorination reactor;

[0047] (3) adding mass percent concentration to the defluorination reactor is 65% sulfuric acid to carry out defluorination reaction, and the mass ratio of solid reactant to sulfuric acid is 1: 0.6, and the reaction time is 2 hours;

[0048] (4) Filter the reaction product obtained in step (3), add the obtained solid into a dissolving kettle, add water in a ratio of 1:2 by mass, heat to boiling, stir and dissolve for 20 minutes;

[0049] (5) filter the reaction product obtained in step (4) with a filter press, send the obtained filtrate into a neutralization tank, add ammonia water with a mass percentage concentration of 15% to adjust the pH value to 8;

[0050] ...

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Abstract

The invention relates to a method for preparing lithium carbonate through extracting lithium from lithium ore. The method comprises the following steps: 1, reacting the lithium ore with fluosilicic acid; 2, filtering; 3, carrying out a fluorine removal reaction; 4, adding water, and dissolving; 5, carrying out a neutralization reaction; and 6, carbonizing to precipitate lithium. The method which allows high energy consumption processes of high temperature roasting and pressurization reacting of the lithium ore in traditional technologies to be not needed and is a method for extracting lithium from the lithium ore through a low temperature process has the characteristics of simple process, low energy consumption and high extraction rate, and makes the comprehensive utilization rate of byproducts be high and the production cost be substantially reduced.

Description

technical field [0001] The invention relates to the technical field of comprehensive development and utilization of lithium ore, in particular to a method for preparing lithium carbonate by extracting lithium from lithium ore by using a low-temperature wet method. Background technique [0002] Lithium is an important strategic resource material and an indispensable raw material for modern high-tech products. The main raw materials for extracting lithium are spodumene, lepidolite, lithium sanolite and salt lake brine. According to different raw materials, lithium extraction is divided into two methods: lithium ore and salt lake brine. [0003] The current methods of extracting lithium from ore are: [0004] (1) Lime sintering method. The method is to mix lithium ore and limestone according to 1:3 (mass ratio), roast at 850-950°C at high temperature, ball mill, and water leaching to obtain LiO-containing 2 3-4g / l LiOH solution, and then through sedimentation, filtration, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08
Inventor 薛彦辉
Owner 薛彦辉