Method for separation and collection of purified alkali metal salt

A technology of alkali metal salt and separation membrane, which is applied to the purification of alkali metal nitrate, alkali metal chloride, alkali metal compound, etc., and can solve the problems of high cost, difficult to effectively recover, difficult to apply, etc.

Active Publication Date: 2013-08-07
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is difficult to efficiently recover these salts as refined salts such as lithium carbonate
[0005] As a solution to the problem, various methods using an adsorbent (Patent Documents 1 to 3), etc. have been proposed, but the problem is that the cost is high, and there is no established technology for stably recovering refined lithium salt at low cost
As a conventional low-cost method, a method of removing impurities by sun-drying brine and concentrati

Method used

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  • Method for separation and collection of purified alkali metal salt
  • Method for separation and collection of purified alkali metal salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0079] Using UTC-60 (cross-linked aramid nanofiltration membrane, manufactured by Toray Industries, Ltd.) as a separation membrane, and brine A and B as raw water, respectively, the ion removal rate and water permeability were evaluated. The results are shown in Table 1 together with the isopropanol removal rate and the glucose removal rate.

Embodiment 2）

[0083] Evaluation was performed in the same manner as in Example 1, except that the separation membrane B was used as the separation membrane. The results are shown in Table 1.

Embodiment 3）

[0085] Evaluation was performed in the same manner as in Example 1, except that the separation membrane C was used as the separation membrane. The results are shown in Table 1.

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Abstract

The present invention relates to a method for separating and recovering a purified alkali metal salt from an aqueous alkali metal salt solution, the method including a treatment step of removing a purification-inhibiting substance from an aqueous alkali metal salt solution with a separation membrane having a glucose removal ratio and an isopropyl alcohol removal ratio simultaneously satisfying the following expressions (I) and (II) when each of a 1000 ppm aqueous glucose solution having a temperature of 25° C. and pH of 6.5 and a 1000 ppm aqueous isopropyl alcohol solution having a temperature of 25° C. and pH of 6.5 is permeated through the separation membrane at an operating pressure of 0.75 MPa: Glucose removal ratio>=90% . . . (I), Glucose removal ratio-Isopropyl alcohol removal ratio>=30% . . . (II).

Description

technical field [0001] The present invention relates to a method for separating and recovering refined alkali metal salts such as refined lithium salts or refined potassium salts from lake water, groundwater, industrial waste water, etc., and to removing refined alkali metal salts by using a separation membrane exhibiting high selective permeability for specific compounds A method for effectively recovering and purifying alkali metal salts by removing hindering substances. Background technique [0002] In recent years, with the development of global industry and economy, the demand for mineral resources has expanded significantly. Among the indispensable mineral resources in various industries (including the semiconductor industry), some resources are technically difficult to obtain as elemental substances despite their large reserves in the earth's crust, and due to the high cost of mining and refining, they are not economically viable. It is not cost-effective, and in man...

Claims

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Application Information

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IPC IPC(8): C01D15/04B01D61/02B01D61/12C01D1/38C01D3/14C01D5/16C01D7/32C01D9/16C01D13/00C01D17/00C01F1/00C01F5/30C01F11/32
CPCB01D69/02C01D15/04B01D61/027C01D5/16C01D3/14B01D2325/20C01D3/04C01D15/08C01P2006/80Y02W10/37B01D71/56B01D71/68C02F1/26C02F1/265C02F2103/08B01D69/1071
Inventor 佐佐木崇夫谷口雅英高畠宽生曾根三郎
Owner TORAY IND INC
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