Method for improving divalent metal extraction separation difference

A technology of divalent metal ions and divalent metals, applied in the field of improving the difference in extraction and separation of divalent metals, can solve the problems of ammonia nitrogen wastewater pollution, high cost of sodium saponification, low extraction efficiency, etc., achieve low energy consumption, short extraction time, The effect of high extraction efficiency

Active Publication Date: 2021-10-26
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

However, the saponification process has the disadvantages of ammonia nitrogen wastewater pollution and high cost of sodium saponification
[0003] In order to overcome these problems, the non-saponification extraction method can be used to separate and purify nickel and cobalt. However, the conventional non-saponification extraction process parameter control has the problems of low extraction efficiency and poor separation effect.

Method used

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  • Method for improving divalent metal extraction separation difference
  • Method for improving divalent metal extraction separation difference

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method utilizing desolvation means to improve the separation difference of divalent metal extraction, said method comprising the following steps:

[0034] first step:

[0035] Build an ultrasonic extraction device, such as figure 1 , add an appropriate amount of water in the tank 6 of the ultrasonic extraction device, the water surface height is 20cm, and the water temperature is adjusted to 25°C. Turn on the ultrasonic generator 3 with a power of 132W to irradiate the tap water inside the device for 10 minutes to remove the bubbles with larger radius in the tap water. Fresh tap water was used in each experiment and the tap water in the device was treated in the above-mentioned manner to ensure that the liquid environment of each experiment was roughly the same.

[0036] Step two:

[0037] Weigh CoSO 4 -7H 2 O and NiSO 4 -6H2 O was dissolved in ultrapure water, respectively, with H 2 SO 4 and NaOH to adjust the pH value of the mixed solution to 5.0 to obtain s...

Embodiment 2

[0058] Carry out extraction test according to the method for embodiment 1, difference is only: metal ion is replaced by nickel and copper, and the power of ultrasonic extraction device is: keep the power of external tank type ultrasonic extractor to be 132W, adjust the power of immersion transducer to be 192W . The irradiation time is 10 minutes, so as to control the energy applied to the system: 115.2kJ / mol nickel or 115.2kJ / mol copper.

[0059] Results: The extraction rate of copper was 72.1%, that of nickel was 2.3%, and the separation coefficient was 31.35.

[0060] Therefore, the use of ultrasonic extraction can also be applied to the separation of nickel and copper.

Embodiment 3

[0073] Carry out extraction test according to the method for embodiment 1, difference is only: metal ion is replaced by nickel and zinc, and the power of ultrasonic extraction device is: keep the power of external tank type ultrasonic extractor to be 132W, adjust the power of immersion transducer to be 168W . The radiation time is 10min. To control the energy applied to the system: 101.3kJ / mol nickel or 101.3kJ / mol zinc.

[0074] Results: The extraction rate of zinc was 98.29%, that of Ni was 1.8%, and the separation coefficient was 54.61.

[0075] Therefore, this ultrasonic extraction method can also be applied to the enhanced separation of nickel and zinc.

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Abstract

The invention discloses a method for improving divalent metal extraction separation difference, and belongs to the technical field of extraction separation. The method comprises the following step that in a liquid-liquid extraction process, energy is supplied to a mixed solution containing two divalent metal ions and an organic phase in a manner of applying an external field; the external field is an ultrasonic external field or an electrostatic field, and the separation effect of any two kinds of metals is enhanced by adjusting ultrasonic power or electric field voltage; and the hydration degree difference of the two divalent metals is maximized in a specific energy range, and the extraction separation difference of the divalent metals is improved. According to the method, the extraction separation difference of the two divalent metals can be remarkably improved, the extraction separation efficiency of the two divalent metals is improved, and the extraction separation effect of the two divalent metals is improved. The method belongs to a novel non-saponification extraction technology, and is beneficial to solving the problem of environmental pollution in the heavy metal extraction and saponification link from the source. Compared with a traditional non-saponification treatment method, the method has the advantages of being high in extraction efficiency, short in extraction time, low in cost and small in energy consumption.

Description

technical field [0001] The invention belongs to the technical field of extraction and separation, and relates to a method for improving the difference in extraction and separation of divalent metals. Background technique [0002] Cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn) and other divalent metals are important non-ferrous metals. Their main source of production is mineral resources. There are three main processes in hydrometallurgical extraction of heavy metals in ores, namely leaching, metal recovery and heat treatment. Wet leaching always applies a sulfate system, resulting in a leach solution containing mainly nickel and cobalt with some impurities that can be removed by pretreatment. However, due to the similar chemical properties between these elements, it is very difficult to separate and purify. The solvent extraction method has the advantages of large processing capacity, fast reaction speed, and good separation effect, and is the main method for the separa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/38C22B23/00C22B19/20C22B15/00
CPCC22B23/0453C22B23/0476C22B19/26C22B15/0084Y02P10/20
Inventor 曹宏斌宁朋歌袁岭温嘉玮杨海伦
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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