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Method for concentrating and softening brine and device thereof

A softening and brine technology, applied in the field of membrane separation, which can solve the problems of low separation coefficient and high energy consumption of nanofiltration membranes

Pending Publication Date: 2020-09-04
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention is to solve the problem that the separation coefficient of magnesium and lithium is not high and the energy consumption required by the nanofiltration membrane is relatively large in the process of removing divalent salts by nanofiltration membrane method for brine in the prior art

Method used

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  • Method for concentrating and softening brine and device thereof
  • Method for concentrating and softening brine and device thereof
  • Method for concentrating and softening brine and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] Salt lake brine concentration, softening and separation

[0112] use figure 1 The device: the salt lake brine in this example is the lithium extraction brine of a certain salt lake in Qinghai. The specific brine content is shown in Table 2. The reverse osmosis membrane group adopts a three-stage type. 99.5%, the rejection rate of magnesium sulfate by the nanofiltration membrane in the nanofiltration membrane group is 98.5%, and two high-pressure pumps are used in series to provide the operating pressure.

[0113] Table 2 Lithium brine content in salt lake

[0114]

[0115]Operating conditions: the operating pressure of the reverse osmosis membrane group is 3.5MPa, the operating pressure of the nanofiltration membrane group is 3.3MPa, the system operating temperature is 28°C, and the pH value is 7.

[0116] Raise the operating pressure of salt lake brine through a high-pressure pump, control the pressure of entering the reverse osmosis membrane at 3.5MPa through th...

Embodiment 2

[0127] Concentration, softening and separation of underground brine

[0128] The underground brine in this example is the underground brine of an enterprise in Shandong, and the specific content is shown in Table 6. The reverse osmosis membrane group adopts a three-stage type, and the rejection rate of sodium chloride by the reverse osmosis membrane in the reverse osmosis membrane group is 99.5%, and the nanofiltration membrane group The rejection rate of magnesium sulfate in the medium nanofiltration membrane is 98.5%, and two high-pressure pumps are used in series to provide the operating pressure.

[0129] Table 6 Underground brine content

[0130]

[0131] Operating conditions: The operating pressure of the reverse osmosis membrane group is 7.5MPa, the operating pressure of the nanofiltration membrane group is 7MPa, the system operating temperature is 28°C, and the pH value is 6.5.

[0132] Raise the operating pressure of salt lake brine through a high-pressure pump, c...

Embodiment 4

[0138] Concentration, softening and separation of brine for salt making

[0139] In this example, the underground brine is the brine of a salt factory in Jiangsu. The specific content is shown in Table 9. The reverse osmosis membrane group adopts a two-stage type. The rejection rate of magnesium sulfate in the medium nanofiltration membrane is 98.5%, and 3 high-pressure pumps are used in series to provide the operating pressure.

[0140] Table 9 Underground brine content

[0141] TDS (g / l) Magnesium (mg / L) Sulfate (mg / L) Calcium (mg / L) Sodium (g / L) salt brine 56 760 1020 420 155

[0142] Operating conditions: the operating pressure of the reverse osmosis membrane group is 11MPa, the operating pressure of the nanofiltration membrane group is 10MPa, the system operating temperature is 28°C, and the pH value is 7.5.

[0143] Raise the operating pressure of salt-making brine through a high-pressure pump, control the pressure of entering the reve...

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Abstract

The invention discloses a method for concentrating and softening brine by integrating reverse osmosis and nanofiltration and a device thereof. A reverse osmosis membrane and a nanofiltration membraneare mainly integrated into a whole; concentrating the brine through a reverse osmosis membrane; the concentrated solution directly enters a nanofiltration membrane to be softened; the brine is integrally concentrated and softened on line; the reverse osmosis membrane and the nanofiltration membrane are integrated on the same device; according to the device, the nanofiltration membrane is directlydriven by the pressure of the reverse osmosis concentrated solution to achieve the separating, softening and filtering effects, the energy consumption, the occupied area and the investment cost of thewhole engineering system can be reduced, and the device has good engineering economy and generalization performance and is suitable for the field of brine refining, and brine comprises salt lake brine, underground brine and salt-making brine.

Description

technical field [0001] The invention relates to a method and device for brine concentration and softening treatment, belonging to the technical field of membrane separation. Background technique [0002] Benefiting from the development of the new energy industry, lithium as a strategic resource has been increasingly valued and is known as an energy metal in the 21st century. Lithium extraction from salt lake brine is the main source of lithium salt production in the world, and salt lake processing products account for more than 70% of lithium salt products. Usually, magnesium and lithium elements coexist in salt lake brine, and because the physical and chemical properties of magnesium and lithium elements are similar, it has caused great difficulties to extract lithium from salt lake brine. [0003] Nanofiltration membrane has excellent interception of divalent and multivalent ions, and the performance of passing through monovalent ions, so that the separation of monovale...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01D15/08C02F101/10
CPCC02F9/00C01D15/08C02F1/441C02F1/442C02F1/42C02F1/5236C02F1/001C02F1/38C02F2101/10C02F2103/007
Inventor 王肖虎熊福军项娟彭跃峰黄世伟顾俊杰肖青彭文博范克银党建兵
Owner JIANGSU JIUWU HITECH
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