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Method for removing iron in leaching liquid of lateritic nickel ore by oxidation

A technology for oxidizing iron and laterite nickel ore is applied in the field of hydrometallurgy, which can solve the problems of high iron removal cost, high manganese ion content, influence on treatment, etc., and achieves the effect of good iron removal effect and cost reduction.

Inactive Publication Date: 2011-05-18
广西银亿新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in the prior art, adding MnO 2 Iron removal method involves outsourcing MnO 2 It leads to the problem of high cost of iron removal, and will introduce new impurity manganese ions, resulting in high manganese ions in the solution after treatment, affecting subsequent treatment

Method used

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  • Method for removing iron in leaching liquid of lateritic nickel ore by oxidation
  • Method for removing iron in leaching liquid of lateritic nickel ore by oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The leach solution contains Fe 2+ 1.7g / l, containing Mn 2+ It is 0.97g / l. The pH of the first-stage nickel precipitation is 8.3, the reaction temperature is 70 degrees Celsius, and the reaction time is 3 hours; the pH of the second-stage manganese precipitation is 9.8, the temperature is 70 degrees Celsius, and the reaction time is 2 hours. The second-stage manganese precipitation slag contains 10% manganese. The second-stage manganese precipitation slag is added to the iron removal section. The actual amount added is 3 times the theoretical calculation amount based on the reaction equation. The reaction temperature is 60 degrees Celsius and the pH value is 0.5 to oxidize ferrous ions into ferric ions. Then increase the pH to 1.7-5.0, the reaction time is 3 hours, the ferric iron ion is hydrolyzed into ferric hydroxide or jarosite precipitation, thereby removing iron, and Fe in the liquid after iron removal 2+ The concentration is <0.002g / l.

Embodiment 2

[0021] The leach solution contains Fe 2+ 1.5g / l, containing Mn 2+ It is 0.82g / l. The pH of the first-stage nickel precipitation is 8.5, the temperature is 62 degrees Celsius, and the reaction time is 1 hour; the pH of the second-stage manganese precipitation is 9.6, the temperature is 62 degrees Celsius, the reaction time is 2.5 hours, and the second-stage manganese precipitation slag contains 6% manganese. The second-stage manganese precipitation slag is added to the iron removal section. The actual amount added is 4 times the theoretical calculation amount based on the reaction equation. The reaction temperature is 65 degrees Celsius and the pH value is 1.0 to oxidize ferrous ions into ferric ions. Then increase the pH to 3.6-4.0, and the reaction time is 4 hours. The ferric ion is hydrolyzed into ferric hydroxide or jarosite precipitation, thereby removing iron, and Fe in the solution after iron removal 2+ The concentration is <0.002g / l.

Embodiment 3

[0023] The leach solution contains Fe 2+ 1.1g / l, containing Mn 2+ It is 0.63g / l. The pH of the first stage of nickel precipitation is 8.3, the temperature is 50 degrees Celsius, and the reaction time is 1.5 hours; the pH of the second stage of manganese precipitation is 9.4, the temperature is 50 degrees Celsius, and the reaction time is 3 hours. The second stage of manganese precipitation slag contains 4% manganese. The second-stage manganese precipitation slag is added to the iron removal section. The actual amount added is 5 times the theoretically calculated amount according to the reaction equation. The reaction temperature is 70 degrees Celsius and the pH value is 1.4 to oxidize ferrous ions into ferric ions. Then increase the pH to 3.6-4.7, the reaction time is 5 hours, the ferric ions are hydrolyzed into ferric hydroxide or jarosite precipitation, thereby removing iron, and Fe in the solution after iron removal 2+ The concentration is <0.002g / l.

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Abstract

The invention discloses a method for removing iron in leaching liquid of a lateritic nickel ore by oxidation. The method comprises the following steps of: regulating the pH value of the leaching liquid to 1.7-5.0 so as to precipitate Fe<3+> ions in the leaching liquid, and then regulating the pH value of the leaching liquid to 7.5-8.5 so as to convert Ni<2+>ions in the leaching liquid to Ni(OH)2 and precipitate and separate the Ni(OH)2. The method further comprises the following steps of: (1) regulating the pH value of nickel precipitant mother liquid to 8.6-10, converting Mn<2+> in the leaching liquid to Mn(OH)2 and precipitating the Mn(OH)2; (2) reacting the Mn(OH)2 in precipitates and oxygen to produce MnO2, using the precipitates containing the MnO2 as an oxidant, filling back to the leaching liquid, oxidizing Fe<2+> in the leaching liquid into Fe<3+> and regulating the pH value to precipitate Fe<3+>. In the method, the oxidant does not need to be additionally added, and the MnO2 produced by the self system is fully utilized as the oxidant, therefore, the cost can be reduced, the iron removing effect is great, and the content of the iron can be reduced below 0.025g / l.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a method for oxidizing and removing iron from laterite nickel ore leachate. Background technique [0002] Sulfuric acid leaching of laterite nickel ore includes pressure acid leaching, atmospheric pressure acid leaching and heap leaching. When treating laterite nickel ore by pressure acid leaching, Fe 2+ is directly oxidized to Fe 3+ , there is no Fe 2+ process. When treating laterite nickel ore by atmospheric acid leaching and heap leaching, the leachate contains Ni 2+ , Mn 2+ , Fe 3+ and a small amount of Fe 2+ Plasma. Fe 3+ When the pH is 1.7, it can be hydrolyzed and removed, while Fe 2+ Generally, it needs to be hydrolyzed and precipitated at a pH higher than 8.5, and Mn 2+ A pH greater than 9.0 is required for precipitation. The general process is to Fe 2+ Oxidized to Fe 3+ And it is hydrolyzed at lower pH conditions, and the commonly used oxidizing agents are H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B23/00
Inventor 肖万林王多冬和润秀王亚秦丘能容仕甲李海燕陈彦林
Owner 广西银亿新材料有限公司
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