Method for separating iron and nickel from laterite nickel ore pickle liquor
A technology of laterite nickel ore and acid leaching solution, which is applied in the directions of photography technology, instruments, photography auxiliary technology, etc., can solve the problems of cumbersome solid-liquid separation operation, poor filtration performance, large amount of iron slag, etc., to improve the recovery rate, The effect of improving quality and shortening process flow
Inactive Publication Date: 2016-08-24
SHANGHAI UNIV
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However, when the chemical precipitation method is used, the amount of deposited iron slag is large, the filtration performance is poor, the solid-liquid separation operation is cumbersome, and the amount of nickel lost with the iron slag is large
In view of the drawbacks of the chemical precipitation method for iron precipitation, hydrometallurgists try to use solvent extraction to remove iron in the sulfuric acid leaching solution of laterite nickel ore. The research on iron removal by extraction method has made great progress, but this method is only suitable for acidity. Leaching solution system with low and low iron content
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[0022] According to the mass ratio of sulfuric acid: laterite nickel ore = 1.3:1, the laterite nickel ore that is ground to 0.061-0.200mm is mixed with sulfuric acid for stirring and leaching, under normal pressure, heated to 80°C, and the leaching time is 120min. After leaching, solidify Then, add a complexing agent to the leachate, adjust the pH value of the leachate to 5.0 with dilute sodium hydroxide solution, and prepare a solution containing 20g / L of iron and 2g / L of nickel Add above-mentioned 330mL solution in the anode chamber; Add 330mL mixed solution to the cathode chamber, described mixed solution is made up of the nickel sulfate that concentration is 105g / L and the sodium citrate that concentration is 176g / L, and its pH is 5.5; With stainless steel as the cathode and graphite as the anode, direct current is applied to carry out electrolysis in the electrolytic cell, and the cathode current density is controlled to 17A / m 2 , cell voltage 4.4V, electrolysis for 13 ho...
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The invention relates to a method for separating iron and nickel from laterite nickel ore pickle liquor. The method comprises the steps that finely-ground laterite nickel ore is leached through sulfuric acid, solid-liquid separation is carried out after leaching is finished, and leaching liquor containing nickel and iron is obtained; a complexing agent is added into the leaching liquor containing nickel and iron, the mixture is poured into an anode chamber of an electrolytic bath with ion exchange membranes as separation media after being sufficiently mixed and is powered by direct current, under the effect of an electric field, by means of the selective permeability of the ion exchange membranes on anions and cations, in other words, the cation exchange membrane only allows cations in a solution to permeate therein and the anion exchange membrane only allows anions in the solution to permeate therein, nickel ions in the leaching liquor are transferred into a cathode chamber and deposited at cathodes, iron in the from of complex anions is reserved in the anode chamber, and therefore iron and nickel in the laterite nickel ore leaching liquor are separated. The method is used for separating iron and nickel in the laterite nickel ore leaching liquor by using the ion exchange membranes as the media, has the beneficial effects that operation is easy and convenient and technological parameters are easy to control, not only can improve nickel and iron separation efficiency, but also can improve the nickel recovery rate.
Description
technical field [0001] The invention relates to a method for separating iron and nickel from laterite nickel ore acid leaching solution, and belongs to the technical field of nonferrous metal hydrometallurgy. Background technique [0002] At present, nickel is mainly extracted from nickel sulfide ore. With the depletion of nickel sulfide ore resources, the nickel industry has shifted the development of nickel from nickel sulfide ore to laterite nickel ore with abundant reserves. The methods of extracting nickel from laterite nickel ore mainly include pyrometallurgy and hydrometallurgy. Among them, pyrometallurgy is suitable for silicon-magnesium-nickel ores with higher magnesium content and lower iron content. However, the pyrometallurgy process consumes a lot of energy. , Pollution is large, and the recovery rate of other valuable metals is low. The hydrometallurgy process is suitable for limonite-type lateritic nickel ore with high iron content and low magnesium content. ...
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Login to View More IPC IPC(8): C25C1/08C25C1/06
CPCC25C1/06C25C1/08
Inventor 谈定生万石保秦岩丁伟中郭曙强
Owner SHANGHAI UNIV