Method for separating high-concentration K2Cr2O7 from saturated NaCl solution

A k2cr2o7, high-concentration technology, applied in the direction of chromate/dichromate, etc., to achieve the effect of good separation, simple device and simple process

Inactive Publication Date: 2013-01-30
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this strongly basic anion exchange fiber has not been used to sep

Method used

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  • Method for separating high-concentration K2Cr2O7 from saturated NaCl solution
  • Method for separating high-concentration K2Cr2O7 from saturated NaCl solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Before separation, the strongly basic anion exchange fiber is transformed by soaking in a solution for a soaking time ≥ 6 hours; the solution is a 0.5-10mol / L HCl solution.

[0022] Will K 2 Cr 2 o 7 - The mixed solution of NaCl passes through the strong basic anion exchange fiber column at a flow rate of 0.4300mL / min (10.0BV / h). In the mixed solution, K 2 Cr 2 o 7 The concentration of NaCl is 2.148g / L, NaCl is a saturated solution, and the pH value is adjusted to 2.06; the column is equipped with a strong basic anion exchange fiber with a dry weight of 0.50g, and the column is wet-packed. The column diameter is 10.0mm and the height is 3.2cm.

[0023] At the start of the separation, the effluent was a saturated NaCl solution containing KCl. When the volume of the effluent was 17.08mL, the concentration of Cr(VI) in the column effluent was still 0g / L, and the penetration rate of Cr(VI) was 0. With the increase of the volume of effluent, the concentration of Cr(Ⅵ)...

Embodiment 2

[0025] Before separation, the strongly basic anion exchange fiber is transformed by soaking in a solution for a soaking time of ≥6 hours; the solution is a 0.5-10mol / L NaCl solution.

[0026] Will K 2 Cr 2 o 7 - The mixed solution of NaCl passes through the strong basic anion exchange fiber column at a flow rate of 0.4300mL / min (10.0BV / h). In the mixed solution, K 2 Cr 2 o 7 The concentration of NaCl is 3.866g / L, NaCl is a saturated solution, and the pH value is adjusted to 4.06; the column is equipped with strong basic anion exchange fibers with a dry weight of 0.50g, and the column is wet-packed. The column diameter is 10.0mm and the height is 3.2cm.

[0027] At the beginning of the separation, the effluent was a saturated solution of NaCl containing KCl. When the volume of the effluent is 6.76 mL, the concentration of Cr(VI) in the column effluent is 0 mg / L, and the penetration rate of Cr(VI) is 0. As the volume of the effluent increases, the concentration of Cr(VI) ...

Embodiment 3

[0029]Before separation, the strongly basic anion exchange fiber is transformed by soaking in a solution for a soaking time of ≥6 hours; the solution is a 0.5-10mol / L NaCl solution.

[0030] Will K 2 Cr 2 o 7 - The mixed solution of NaCl passes through the strong basic anion exchange fiber column at a flow rate of 1.005mL / min (10.0BV / h). In the mixed solution, K 2 Cr 2 o 7 The concentration of NaCl is 4.912g / L, NaCl is a saturated solution, and the pH is adjusted to 1.00; the column is equipped with a strong basic anion exchange fiber with a dry weight of 1.00g, and the column is wet-packed. The column diameter is 10.0mm and the height is 8.0cm.

[0031] At the beginning of the separation, the effluent was a saturated solution of NaCl containing KCl. When the volume of the effluent is 24.00 mL, the concentration of Cr(VI) in the column effluent is 0 mg / L, and the penetration rate of Cr(VI) is 0. As the volume of the effluent increases, the concentration of Cr(Ⅵ) in the ...

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Abstract

The invention relates to a method for separating high-concentration K2Cr2O7 from a saturated NaCl aqueous solution by using strong-base anion exchange fibers. The method comprises the following steps of: injecting a mixed solution into a separation column filled with the strong-base anion exchange fibers, so that Cr2O7<2-> in the mixed solution is adsorbed on the strong-base anion exchange fibers, and the obtained filtrate is a saturated NaCl solution containing KCl; and performing evaporative crystallization on the filtrate, and thus obtaining pure NaCl and KCl solid. By the method, the separation process is easy and convenient, the device is simple, and separation of the high-concentration K2Cr2O7 and the saturated NaCl solution can be finished in the fixed bed ion exchange column.

Description

technical field [0001] The invention relates to a method for separating high-concentration K from saturated NaCl solution 2 Cr 2 o 7 The method, especially relates to a kind of application strong basic anion exchange fiber, separates high concentration K from saturated NaCl aqueous solution 2 Cr 2 o 7 Methods. Background technique [0002] in K 2 Cr 2 o 7 During the production process, there will be high concentration (2.00-5.00g / L) K 2 Cr 2 o 7 of saturated NaCl water washes. Among them, Cr(Ⅵ) is extremely carcinogenic, and direct discharge will pose a great threat to human health. Separation of high concentration K from saturated NaCl solution 2 Cr 2 o 7 , not only can obtain pure NaCl, but also can recover and reuse the high concentration of Cr(Ⅵ), so the separation and recovery of Cr(Ⅵ) is of great significance. Ion exchange fiber is a new type of ion exchanger, which has the advantages of large exchange capacity, fast exchange and regeneration rate, vari...

Claims

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Application Information

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IPC IPC(8): C01G37/14
Inventor 王文庆李明愉曾庆轩
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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