Method for selective precipitation separation of nickel and manganese by utilizing CO2 gas

A precipitation separation and CO2 technology, applied in the field of selective precipitation and separation of nickel and manganese, can solve the problems of difficult filtration, incomplete separation, complicated control, etc., and achieve the effect of good filtration performance, elimination of local excess concentration, and complete manganese precipitation

Active Publication Date: 2014-12-31
GEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the selective precipitation method is the most commonly used, including oxidation precipitation, sulfide precipitation, complexation precipitation and ammonium bicarbonate precipitation, etc. Due to the very similar properties of nickel and manganese, these existing methods usually have shortcomings such as incomplete separation, difficult filtration or complicated control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Get 200ml of nickel-manganese solution, wherein the nickel ion content is 5.9g / l, the manganese ion content is 11g / l, the pH of the solution is 3.7, add ammonium sulfate in the nickel-manganese solution, and the quality of the ammonium salt added is 52.9 g;

[0023] (2) Add 8g of sodium hydroxide to adjust the pH value of the solution to 8.9;

[0024] (3) Maintain the temperature of the solution at 25°C and pass CO 2 Until the pH of the solution is 7.5, the flow rate of the gas is 7.2 l / h, and the time for feeding the gas is 1.7 hours;

[0025] (4) The manganese carbonate precipitate was filtered and washed, and then dried to obtain 4.5 g of filter residue, which was analyzed after drying, and the nickel content was 0.56%, and the manganese content was 36.6%.

[0026] Finally, the precipitation rate of manganese was 98.7%, and the loss rate of nickel was 1.17%.

Embodiment 2

[0028] (1) get nickel-manganese solution 200ml, wherein nickel ion content is 5.9g / l, and manganese ion content is 11g / l, and the pH of solution is 3.7, adds ammonium sulfate in nickel-manganese solution, and the quality in the ammonium salt of adding is 52.9g;

[0029] (2) Add 8g of sodium hydroxide to adjust the pH value of the solution to 8.8;

[0030] (3) Maintain the temperature of the solution at 35°C and pass CO 2 Until the pH of the solution is 8.2, the flow rate of the gas is 8.1 l / h, and the time for feeding the gas is 0.5 hour;

[0031] (4) The manganese carbonate precipitate was filtered and washed, and then dried to obtain 4.6 g of filter residue, which was analyzed after drying, and the nickel content was 0.13%, and the manganese content was 45.0%.

[0032] Finally, the precipitation rate of manganese was 99.8%, and the loss rate of nickel was 0.27%.

Embodiment 3

[0034] (1) get nickel-manganese solution 200ml, wherein nickel ion content is 5.9g / l, and manganese ion content is 11g / l, and the pH of solution is 3.7, adds ammonium sulfate in nickel-manganese solution, and the quality in the ammonium salt of adding is 52.9g;

[0035] (2) Add 8g of sodium hydroxide to adjust the pH value of the solution to 8.8;

[0036] (3) Maintain the temperature of the solution at 40°C and pass CO 2 Until the pH of the solution is 6.9, the flow rate of the gas is 6.5 l / h, and the time for feeding the gas is 3.3 hours;

[0037] (4) The manganese carbonate precipitate was filtered and washed, and then dried to obtain 4.7 g of filter residue, which was analyzed after drying, and the nickel content was 0.54%, and the manganese content was 46.3%.

[0038] Finally, the precipitation rate of manganese was 99.8%, and the loss rate of nickel was 1.13%.

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Abstract

The invention relates to element separation, particularly to a method for selective precipitation separation of nickel and manganese by utilizing CO2 gas, solving the problems of incomplete separation, difficult filtration or control complexity in the prior art. The method comprises the following steps: (1) adding ammonium salts in a nickel manganese solution, wherein the mole number of ammonium radical in the added ammonium salts is 4-15 times the total mole number of nickel and manganese in the solution; (2) adding alkaline to adjust the pH value of the solution to 7-10; (3) keeping the solution at a temperature from 10 to 60 DEG C and introducing CO2 for 2-5 hours until the pH of the solution is 6-7; and (4) filtering and washing a manganese carbonate sediment. According to the method for selectively precipitating manganese in the nickel and manganese solution by utilizing CO2 gas, disclosed by the invention, efficient separation of nickel and manganese is realized, the concentration of manganese ions in the solution can be decreased to dozens of milligrams per liter, and the nickel content in the sediment is only parts per thousand.

Description

technical field [0001] The invention relates to element separation, in particular to a method for utilizing CO 2 A method for separating nickel and manganese by gas selective precipitation. Background technique [0002] Nickel and manganese are not only associated in continental manganese ore and marine manganese nodules, but also coexist as main elements in waste materials such as alloys, ceramics, batteries and catalysts. The content of manganese in these nickel-containing resources is relatively high, and the separation of nickel and manganese has become an important topic in hydrometallurgy research. The methods for separating nickel and manganese include selective precipitation, extraction and so on. Among them, the selective precipitation method is the most commonly used, including oxidation precipitation, sulfide precipitation, complexation precipitation and ammonium bicarbonate precipitation, etc. Due to the very similar properties of nickel and manganese, these ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B23/00C22B47/00
Inventor 何显达王勤陈艳红吕志陶远豪
Owner GEM CO LTD
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