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Method for extracting magnesium and lithium from brine

A technology of brine and magnesium carbonate, applied in the direction of magnesium carbonate, lithium carbonate;/acid carbonate, etc., can solve the problems of high freight and energy costs, large amount of entrainment of lithium ions, and reduced recovery rate of lithium salts, etc. Achieve the effect of reducing the dosage, increasing the value of salt lake, and improving the recovery rate of ions

Inactive Publication Date: 2010-12-08
张慧媛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnesium produced by the above methods are all low-priced products such as bicholorite, epsom salt, magnesium hydroxide, etc. Since most of China’s salt lake resources are in Tibet, Qinghai and other areas with inconvenient transportation and energy shortages, it is necessary to Establish a power generation system, and because the freight and energy costs are very high, the price of magnesium products is even lower than its freight, so it cannot be developed, which directly leads to the flooding of these by-products and seriously affects the local environment. Since magnesium hydroxide is usually colloidal precipitation, The entrainment of lithium ions is large and almost unrecoverable, the recovery rate of lithium salt is greatly reduced, and the production cost is increased accordingly

Method used

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  • Method for extracting magnesium and lithium from brine
  • Method for extracting magnesium and lithium from brine
  • Method for extracting magnesium and lithium from brine

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Take a certain salt lake brine containing magnesium, its composition is shown in the sample L-1-1 in Table 1, put L-1-1 and the combustion tail gas of the coal furnace into the closed absorption tower for reaction, and add ammonia water during the reaction to make the pH value equal to or greater than 5, the control temperature is 0 , the pressure is 4Mpa, the reaction time is 1 hour, then the solid-liquid separation of the product in the tower, after analysis, the white precipitate is mainly composed of magnesium carbonate, by washing and drying, the magnesium carbonate product is obtained, and its magnesium carbonate content is 96%.

Embodiment 2

[0025] Take a certain salt lake brine with a mass ratio of magnesium to lithium of 3, whose composition is shown in the sample L-2-1 in Table 1, put L-2-1 into a closed reaction kettle, then into carbon dioxide, and add ammonia to make the pH value equal to or greater than 5. Control the temperature to -80 , the pressure is 0.1 Mpa, magnesium and lithium are precipitated at the same time, and a precipitate with a mixed salt of magnesium carbonate and lithium carbonate as the main component is formed. The composition of the precipitate is shown in sample S-2-1 in Table 1.

[0026] Add water to precipitate S-2-1 to make a slurry with a concentration of 30%, put it in a flotation machine and stir for 30 minutes, add collector fatty amine solution at 60g / ton of mixed salt, and add foaming agent at 40g / ton of mixed salt Mixed alcohols with 4-11 carbon atoms, adding inhibitor sodium hexametaphosphate at 20g per ton of mixed salt, and performing two flotations to obtain a concentrat...

Embodiment 3

[0028] Based on Example 2, add water to precipitate S-2-1 to make a slurry with a concentration of 70%, place it in a flotation machine and stir for 40 minutes, add collector fatty amine solution at 380g / ton of mixed salt, 400g / per ton Add foaming agent mixed alcohol with 4-11 carbon atoms to 1 ton of mixed salt, add inhibitor sodium hexametaphosphate to 400g / ton of mixed salt, carry out two flotations, and obtain a concentrate containing 61% lithium carbonate.

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Abstract

The invention discloses a method for extracting magnesium and lithium from brine. The method comprises the steps of introducing brine containing magnesium into a gas-liquid reaction kettle or an absorption tower, reacting with gas containing carbon dioxide at the pressure of 1x105-1x107Pa and the temperature of 80 DEG C below zero to 200 DEG C so that the brine can absorb enough carbon dioxide to generate magnesium carbonate precipitate, filtering and separating mother liquor to obtain the crude product mainly containing the magnesium carbonate. The invention has the following characteristics: extra precipitator is not needed; the gas containing carbon dioxide can be tail gas and other secondary products after combustion of fuel; the cost of the reagent is low; the element of magnesium without high value is developed into the product so as to greatly increase the value of a salt lake and solve the pollution of the low-cost magnesium to the environment; the energy consumption is low and the tail gas after combustion of fuel is recycled, which is very environmental-friendly.

Description

technical field [0001] The invention relates to a method for extracting magnesium and lithium from brine. Background technique [0002] Existing reports about the method for extracting magnesium and lithium from brine, as the disclosed method of the Chinese patent application CN1335263, needs to add precipitant and NaOH to carry out deep precipitation of magnesium, and the disclosed method of the Chinese patent application of 01128815.9 is also It is necessary to add alkali for deep magnesium removal and then add precipitant to precipitate lithium. The method disclosed in the Chinese patent application with application number 200910059055.9 also needs to add alkali for deep precipitation of magnesium and lithium and then add precipitant to precipitate lithium. Magnesium produced by the above methods are all low-priced products such as bicholorite, epsom salt, magnesium hydroxide, etc. Since most of China’s salt lake resources are in Tibet, Qinghai and other areas with inconv...

Claims

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Application Information

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IPC IPC(8): C01F5/24C01D15/08
Inventor 不公告发明人
Owner 张慧媛
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