Method for removing harmful anions from aqueous solution by adopting Friedel salt or Kuzel salt

An aqueous solution and anion technology, applied in the field of water treatment, can solve the problems of poor chemical stability, low mechanical strength, and low removal efficiency, and achieve the effects of easy operation, simple equipment, and large ion exchange capacity

Inactive Publication Date: 2014-01-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] The technical solution of the present invention: Aiming at the shortcomings of the existing water treatment technology, such as inconvenient operation, secondary pollution, low removal efficiency, high cost, low mechanical strength and poor chemical stability, etc., when dealing with aqueous solutions containing harmful anions, a Using Friedel salt or Kuzel salt to remove harmful anions in aqueous solution, the removal efficiency of harmful anions is very high and the effect is obvious; the materials required for the preparation of Friedel salt or Kuzel salt have a wide range of sources, low energy consumption and low investment;

Method used

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  • Method for removing harmful anions from aqueous solution by adopting Friedel salt or Kuzel salt
  • Method for removing harmful anions from aqueous solution by adopting Friedel salt or Kuzel salt
  • Method for removing harmful anions from aqueous solution by adopting Friedel salt or Kuzel salt

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Effect test

Embodiment 1

[0044] (1) Calcium chloride reagent is dissolved in water to make solution A with a concentration of 0.5mol / L;

[0045] (2) Add sodium hydroxide and aluminum hydroxide to water, heat to dissolve the sodium hydroxide and aluminum hydroxide, and obtain sodium aluminate solution B, in which the concentration of aluminum ions is 0.5mol / L, and Na in the sodium aluminate solution + with Al 3+ The molar ratio is 3.0;

[0046] (3) Add 300ml of solution B prepared in step (2) into the jacketed reaction tank, pass a circulating water bath into the jacket of the jacketed reaction tank, and adjust the temperature of solution B to 30°C, At a stirring speed of 300rpm, add 300ml of the solution A prepared in step (2) into the reaction tank, and after the addition, filter to obtain Friedel salt;

[0047] (4) washing the crude Friedel salt obtained after filtering in step (3) with water, and drying to obtain dried Friedel salt;

[0048] (5) Put the dried Friedel salt obtained in step (4) in...

Embodiment 2

[0051] (1) Dissolve calcium chloride, a by-product in the soda ash industry, in water to prepare solution A with a concentration of 0.8mol / L;

[0052] (2) Add sodium hydroxide and aluminum chloride to water, heat to dissolve sodium hydroxide and aluminum chloride, and obtain sodium aluminate solution B, in which the concentration of aluminum ions is 0.4mol / L, and Na in sodium aluminate solution + with Al 3+ The molar ratio is 6.0;

[0053] (3) Add 400ml of the solution B prepared in step (2) into the jacketed reaction tank, pass a circulating water bath into the jacket of the jacketed reaction tank, and adjust the temperature of solution B to 50°C. At a stirring speed of 400rpm, add 400ml of the solution A prepared in step (2) into the reaction tank, and after the addition is completed, filter to obtain Friedel salt;

[0054] (4) washing the crude Friedel salt obtained after filtering in step (3) with water, and drying to obtain dried Friedel salt;

[0055] (5) Pack the dri...

Embodiment 3

[0060] (1) Dissolve calcium chloride, a by-product in the soda ash industry, in water to prepare solution A with a concentration of 2.0mol / L;

[0061] (2) Add sodium hydroxide and aluminum sulfate to water, heat to dissolve sodium hydroxide and aluminum sulfate, and obtain sodium aluminate solution B, in which the concentration of aluminum ions is 1.2mol / L, and Na in sodium aluminate solution + with Al 3+ The molar ratio is 7.0;

[0062] (3) Add 380ml of the solution B prepared in step (2) into the jacketed reaction tank, pass a circulating water bath into the jacket of the jacketed reaction tank, and adjust the temperature of solution B to 70°C, At a stirring speed of 250rpm, add 380ml of the solution A prepared in step (2) into the reaction tank, and after the addition, filter to obtain Friedel's salt;

[0063] (4) washing the crude Friedel salt obtained after filtering in step (3) with water, and drying to obtain dried Friedel salt;

[0064] (5) Pack the dried Friedel sa...

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Abstract

The invention discloses a method for removing harmful anions from an aqueous solution by adopting a Friedel salt or Kuzel salt. The method comprises a step of removing the harmful anions from the aqueous solution by adopting the Friedel salt or Kuzel salt, wherein the harmful anions comprise one or more of F<->, CN<->, SCN<->, As (III, V) and Cr (VI), and the aqueous solution comprises one or more of drinking water, underground water sources, industrial wastewater and tailings water containing harmful anions. According to the method disclosed by the invention, the Friedel salt or Kuzel salt is applied to the aqueous solution containing the harmful anions, the removal efficiency of the harmful anions is very high, and the effect is obvious; the materials required for preparing the Friedel salt or Kuzel salt are wide in source, low in preparation energy consumption and less in investment; by adopting the method to remove the anions from the aqueous solution, the flow is short and the cost is low, so that the method has a wide application prospect.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for removing harmful anions in aqueous solution by using Friedel salt or Kuzel salt. Background technique [0002] With the development of industrial production and urban modernization, the pollution of groundwater sources has become increasingly prominent, and the discharge of industrial wastewater and domestic sewage has also attracted more and more attention. The pollution of water resources by various harmful anions such as fluoride ion, arsenic, chromium, cyanide ion and thiocyanate ion has become one of the most serious problems in the world. For example, due to the very high fluoride ion content in coal in my country (200mg / kg), the fluoride ion pollution problem of mine water used in coal mining and coal-fired power plant wastewater is very prominent, which has seriously affected the health of workers. Therefore, it is of great practical significance to effectivel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/42C02F1/58B01J41/10
Inventor 李志宝张妍
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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