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Method for separating and recovering cadmium from base metal solution

Pending Publication Date: 2021-09-14
中科院过程工程研究所南京绿色制造产业创新研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires high-voltage electric field demulsification, high processing costs, and does not separate cadmium from other metal elements.

Method used

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  • Method for separating and recovering cadmium from base metal solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] The process flow chart of the method for separating and recovering cadmium in the base metal solution provided by this embodiment is as follows figure 1 As shown, the method includes the following steps:

[0088] (1) Utilize 201×7 model strong basic anion exchange resin containing quaternary ammonium salt group to adsorb 1M potassium iodide aqueous solution with pH 7 as halogen solution, make strong basic anion exchange resin reach adsorption saturation, wash with pure water Remove excess potassium iodide aqueous solution to obtain a strongly basic anion exchange resin containing iodide ions; use 0.1M NaOH to react with cadmium-containing zinc sulfate, that is, a base metal solution, to make the concentration of ferric iron in the cadmium-containing zinc sulfate solution Reduce to 0.9mg / kg; Extract divalent copper with 0.1M 2-hydroxy-5-nonylacetoxime to reduce its concentration to 0.9mg / kg; Mix zinc sulfate solution and hydrochloric acid solution to obtain sulfuric acid...

Embodiment 2

[0093] This embodiment provides a method for separating and recovering cadmium in a base metal solution, the method comprising the following steps:

[0094] (1) Use Amberlite IRA 900 type strong basic anion exchange resin containing quaternary ammonium salt group to adsorb 1M potassium iodide aqueous solution with pH of 7. After the strong basic anion exchange resin reaches adsorption saturation, wash with pure water to remove excess Potassium iodide aqueous solution, obtains the strongly basic anion exchange resin containing iodide ion;

[0095] Use NaOH with a concentration of 0.1M to react with cadmium-containing zinc chloride to reduce the concentration of ferric iron in the zinc chloride solution to 0.8mg / kg, and use 2-hydroxy-5-nonylacetoxime with a concentration of 0.1M Extract divalent copper to reduce its concentration to 0.7 mg / kg; perform adsorption according to the mass ratio of iodine-containing strongly basic anion exchange resin to zinc chloride solution at 1:10...

Embodiment 3

[0099] This embodiment provides a method for separating and recovering cadmium in a base metal solution, the method comprising the following steps:

[0100] (1) Use ZB-2 type strong basic anion exchange fibers containing quaternary ammonium salt groups to absorb 1M potassium bromide aqueous solution with a pH of 7. After the strong basic anion exchange fibers reach adsorption saturation, wash them with pure water to remove Excessive potassium bromide aqueous solution, obtains the strongly basic anion exchange fiber containing bromide ion;

[0101] Mix the copper sulfate solution containing cadmium and the hydrobromic acid solution that concentration is 1M, obtain the copper sulfate solution before adsorption; The molar ratio of bromide ion and cadmium ion in the copper sulfate solution before described adsorption is 2:1; The sulfuric acid The concentration of ferric iron in the copper solution is 0.6mg / kg;

[0102] According to the strong basic anion exchange fiber containing...

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Abstract

The invention provides a method for separating and recovering cadmium from a base metal solution, which comprises the following steps: (1) adsorbing a cadmium-containing base metal solution by using a strong-basicity anion exchanger containing halogen groups to obtain an adsorbed strong-basicity anion exchanger; and (2) when the cadmium-containing base metal solution contains zinc, eluting the adsorbed strong-basicity anion exchanger through a first solution to obtain a zinc-containing solution and a zinc desorption strong-basicity anion exchanger, and eluting the zinc desorption strong-basicity anion exchanger with a second solution to obtain a cadmium-containing solution, or when the cadmium-containing base metal solution does not contain zinc, eluting the adsorbed strongly basic anion exchanger through a second solution to obtain a cadmium-containing solution. According to the method, separation and recovery of cadmium in the base metal solution are achieved through an adsorption-desorption method, operation is easy, the treatment cost is low, no toxic substance participates, environmental pollution is avoided, and good environmental benefits and economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical fields of metallurgy and environmental protection, in particular to a method for separating and recovering cadmium in a base metal solution. Background technique [0002] The process of smelting base metals (such as manganese, cobalt, nickel, copper, zinc, etc.) from natural minerals or renewable resources and removing or recovering heavy metals from wastewater often involves the removal of cadmium or the separation of cadmium and other metal elements. Traditional cadmium removal techniques include fire method and wet method. The fire method separates cadmium from other metals by high-temperature distillation, for example, the separation of cadmium and zinc often uses the fire method. This type of method consumes a lot of energy and causes pollution. Although it is still widely used, it does not conform to modern development concepts. The classic wet cadmium removal method is the replacement method, especially t...

Claims

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Application Information

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IPC IPC(8): C02F1/28B01J20/34C22B17/00C22B7/00C02F101/20
CPCC02F1/285B01J20/3475C22B17/04C02F2101/20C02F2303/16Y02P10/20
Inventor 张衍林王勇
Owner 中科院过程工程研究所南京绿色制造产业创新研究院