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Sodium sulfate type brine or salt nitrate mother liquor polygeneration method for salt potassium nitrate lithium

A technology of sodium sulfate and mother liquor, applied in the field of comprehensive utilization of resources, can solve the problems of development and utilization of lithium resources with low lithium content, and achieve the effects of improving resource utilization, saving investment, and expanding benefits

Active Publication Date: 2021-06-15
江苏省制盐工业研究所有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium salt production in China is mainly to mine hard rock type and salt lake brine type lithium ore resources. Lithium resources in well mine salt brine have not been developed and utilized due to the low lithium content.

Method used

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  • Sodium sulfate type brine or salt nitrate mother liquor polygeneration method for salt potassium nitrate lithium
  • Sodium sulfate type brine or salt nitrate mother liquor polygeneration method for salt potassium nitrate lithium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Please refer to the attached figure 1 , the composition of low-nitrate brine containing potassium and lithium is: NaCl content 300g / L, Na 2 SO 4Content 22g / L, K + Content 5g / L, Li + content of 200mg / L, first enter the reaction tank and adopt the two-alkali method to remove calcium and magnesium, and add 30% NaOH and NaOH with a theoretical equivalent of 100% at room temperature 2 CO 3 Calcium and magnesium impurities are removed from the solution, and after aging for 1-2 hours, calcium mud and magnesium mud are released from the bottom. The supernatant enters the ceramic membrane filtration system for further purification, and the total amount of calcium and magnesium ions in the purified brine is ≤1mg / L. The ceramic membrane with a pore size of 50nm can completely remove the suspended solids in the brine (the diameter of the suspended solids is greater than 50nm).

[0039] (3) After purification, brine passes through a nanofiltration device to obtain low-nitrate ...

Embodiment 2

[0045] Please refer to the attached figure 2 , (1) The high-nitrate brine containing potassium and lithium is: NaCl content 110g / L, Na 2 SO 4 Content 220g / L, K + Content 8g / L, Li + The content is 260mg / L, the reaction tank adopts the two-alkali method to remove calcium and magnesium, and 30% NaOH and NaOH with a theoretical equivalent of 100% are added at room temperature 2 CO 3 Calcium and magnesium impurities are removed from the solution, and after aging for 1-2 hours, calcium mud and magnesium mud are released from the bottom. The supernatant enters the ceramic membrane filtration system for further purification, and the total amount of calcium and magnesium ions in the purified brine is ≤1mg / L. The ceramic membrane with a pore size of 50nm can completely remove suspended solids with a diameter greater than 50nm in brine.

[0046] (2) After purification, the brine enters the sodium sulfate evaporation tank, evaporates and concentrates at 88~108°C, separates the soli...

Embodiment 3

[0051] Please refer to the attached figure 2 , (1) high nitrate brine containing potassium and lithium is divided into: NaCl content 220g / L, Na 2 SO 4 Content 110g / L, K + Content 5g / L, Li + content of 340mg / L, first enter the reaction tank and adopt the two-alkali method to remove calcium and magnesium, and add 30% NaOH and NaOH with a theoretical equivalent of 100% at room temperature 2 CO 3 Calcium and magnesium impurities are removed from the solution, and after aging for 1-2 hours, calcium mud and magnesium mud are released from the bottom. The supernatant enters the membrane filtration system for further purification, and the total amount of calcium and magnesium ions in the purified brine is ≤1mg / L. The ceramic membrane with a pore size of 50nm can completely remove suspended solids with a diameter greater than 50nm in brine.

[0052] (2) After purification, the brine enters the sodium sulfate evaporation tank, evaporates and concentrates at 88~108°C, separates th...

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Abstract

The invention relates to a method for the poly-production of salt potassium nitrate lithium from sodium sulfate type brine or salt nitrate mother liquor. After extracting sodium chloride and sodium sulfate from sodium sulfate type mine salt brine containing lithium and potassium resources, or this type of brine The invention relates to a comprehensive utilization method for extracting useful resources such as salt, nitrate, potassium and lithium from the produced salt nitrate mother liquor. The method produces sodium chloride, sodium sulfate, potassium chloride, lithium carbonate and other products through steps such as two-alkali purification, membrane filtration, nanofiltration denitrification, thermal nitration, evaporation of salt, evaporation of potassium, and precipitation of lithium. The technical method realizes efficient resource utilization of lithium and potassium-containing sodium sulfate type well salt brine or salt nitrate mother liquor, realizes joint production of salt, potassium, nitrate and lithium, improves resource utilization rate, and no waste liquid is discharged during the entire production process.

Description

technical field [0001] The invention relates to a method for co-producing salt potassium nitrate lithium from sodium sulfate type brine or salt nitrate mother liquor, and belongs to the technical field of comprehensive utilization of resources. Background technique [0002] Mine salt brine refers to underground natural brine drawn from well drilling or brine formed by water-soluble mining of underground rock salt. It is mainly sodium sulfate type and calcium sulfate type, of which sodium sulfate type accounts for more than 2 / 3. In addition to the main components such as sodium chloride and sodium sulfate, the sodium sulfate type mine salt brine also contains trace elements such as lithium and potassium. At present, most domestic sodium sulfate brines use nitrate or salt-nitrate co-production to extract and utilize most of the sodium chloride and sodium sulfate. Using this process will produce a large amount of salt mother liquor, which will be injected downhole and circulat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/00C01D3/06C01D15/08
CPCC01D3/06C01D5/00C01D15/08C01P2006/80
Inventor 宋茜茜刘正友张文广马朝辉郭云云曹军
Owner 江苏省制盐工业研究所有限公司