Method for converting carbonic acid type salt lake brine into chloride type brine

A salt lake brine and carbonic acid type technology, applied in alkali metal chloride, lithium carbonate;/acid carbonate, lithium halide, etc., can solve the risk of environmental pollution, poor environmental self-purification ability, large acid-base consumption, etc. It can improve the yield of lithium ions, reduce the loss of lithium ions, and improve the efficiency of irradiation.

Pending Publication Date: 2020-09-01
BEIJING QINGYUAN POWERISE TECH CO LTD +1
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AI Technical Summary

Problems solved by technology

[0018] The application of extraction technology on carbonated salt lakes has problems such as large acid and alkali consumption and environmental pollution risks. Especially carbonated salt lakes exist at altitudes above 4000. The ecological environment in these areas is fragile and the environmental self-purification ability is poor. Pollution-free zero discharge process

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  • Method for converting carbonic acid type salt lake brine into chloride type brine

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Experimental program
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Embodiment approach

[0045] see figure 1 , according to another preferred embodiment of the present invention, the method for converting the carbonate type salt lake brine into chloride type brine is provided, which is characterized in that it includes the following steps:

[0046] passing the carbonated salt lake brine through an ion exchange resin to remove trace amounts of calcium and magnesium ions in the brine to obtain softened brine;

[0047] Pump the softened brine into the first-stage nanofiltration membrane system, and apply pressure on both sides of the first-stage nanofiltration membrane to form a pressure difference;

[0048] Part of the water, sodium ions, potassium ions, lithium ions, and chloride ions in the softened brine migrate from the high-pressure side to the low-pressure side through the first-stage nanofiltration membrane;

[0049] The high-valent anions on the high-pressure side are enriched to obtain brine rich in high-valent anions, and the brine rich in high-valent anion...

Embodiment 2

[0069] Some carbonate-type salt lakes are rich in lithium ions and carbonate ions, and have high resource endowment. Lithium carbonate can be formed after concentration in salt fields. However, salt lakes also contain a large amount of sulfate ions, polyborate ions, bicarbonate ions, chloride ions, sodium ions, and potassium ions. The existence of a large number of borate ions leads to low radiation efficiency in salt fields. At the same time, a large amount of salts such as mirabilite, sodium carbonate decahydrate, sodium chloride, halite, potassium halite, potassium chloride, and sodium tetraborate are formed during the concentration process of salt fields. A large amount of entrainment loss of lithium ions is caused, resulting in a low yield of lithium ions. At the same time, the phase diagram of the multi-component system is complex, and valuable elements such as potassium ions cannot be separated, resulting in a great waste of resources.

[0070] Therefore, the invention ...

Embodiment 3

[0079] A specific example is further described below with reference to Embodiment 1-2. A kind of lithium-containing carbonate type salt lake brine whose index is Li + : 1g / L, Na + : 90g / L, K + 20g / L, Mg 2+ : 10ppm, Ca 2+ : 0.04ppm, B 2 o 3 : 13g / L; SO 4 2- : 20g / L, CO 3 2- : 20g / L, HCO 3 -: 0.4g / L, chloride ion 120g / L;

[0080] The specific implementation steps are as follows:

[0081] a) The brine is passed through the sodium-type semi-EDTA type chelating resin, and after the ion exchange of the chelating resin, soften the Mg in the brine 2+ ≤0.01ppm, Ca 2+ ≤0.01ppm, after the resin is saturated, use hydrochloric acid or sulfuric acid to regenerate the hydrogen form, and then use sodium hydroxide to regenerate the sodium form;

[0082] b) The softened brine is pumped into the primary nanofiltration system, and the operating pressure of the nanofiltration system is 90kg / cm 2 At the same time, pure water is added to the nanofiltration membrane concentrated solut...

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Abstract

The invention discloses a method for converting carbonic acid type salt lake brine into chloride type brine. The method comprises the following steps that: enabling carbonic acid type salt lake brineto pass through ion exchange resin to remove trace calcium and magnesium ions in the brine and obtain softened brine; pumping softened brine into a first-stage nanofiltration membrane system, applyingpressure to the two sides of a first-stage nanofiltration membrane, to form a pressure difference; enabling parts of water, sodium ions, potassium ions, lithium ions and chloride ions in the softenedbrine to migrate to a low-pressure side from a high-pressure side through the first-stage nanofiltration membrane, enriching the high-valence anions on the high-pressure side to obtain brine rich inthe high-valence anions, pumping the brine rich in the high-valence anions back to the salt lake, wherein the high-valence anions comprise sulfate ions, carbonate ions and polyborate ions; and obtaining chloride type brine containing a small amount of high-valence anions on the low-pressure side.

Description

technical field [0001] The invention relates to a method for converting carbonate-type salt lake brine into low-valence chloride-type brine by nanofiltration. Background technique [0002] Some carbonated salt lakes in Tibet and South America are rich in lithium ions, and also rich in carbonate ions, with high resource endowment. Lithium carbonate can be formed after concentration in salt fields. However, these carbonate salt lakes also contain a large amount of sulfate ions, polyborate ions, bicarbonate ions, chloride ions, sodium ions, and potassium ions. [0003] After the applicant's continuous research, it was found that the existence of a large number of borate ions caused the low efficiency of salt field radiation, and at the same time, the formation of Glauber's salt, sodium carbonate decahydrate, sodium chloride, halite, potassium halite, and potassium chloride in the salt field concentration process A large number of salts such as sodium tetraborate and sodium tet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06C01D15/04C01D15/08
CPCC01D3/06C01D15/04C01D15/08
Inventor 曹建勇杨荣梅波赵清
Owner BEIJING QINGYUAN POWERISE TECH CO LTD
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