Clean production method for separating manganese and magnesium from laterite-nickel ore normal-temperature acid leaching liquid employing alkaline oxidation

A technology of laterite nickel ore and alkaline oxidation is applied in the direction of improving process efficiency, which can solve the problems of expensive precipitating agent and environmental damage, and achieve the effects of low price, realizing recycling and improving comprehensive utilization rate.

Inactive Publication Date: 2015-06-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the face of today's severe environmental problems, it is very important to choose an environmentally friendly process. In view of the relatively expensive precipitant in the precipitation method and the damage to the environment, the precipitant H selected in the present invention 2 o 2 The solution is cheap, harmless to the environment, and can effectively separate Mn and Mg from the nickel-cobalt chloride solution. The prepared MnO, MgO and nickel hydroxide cobalt slag are of better quality and can meet the requirements of industrial applications. Improved comprehensive utilization of resources

Method used

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  • Clean production method for separating manganese and magnesium from laterite-nickel ore normal-temperature acid leaching liquid employing alkaline oxidation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The Ni, Co, Mn and Mg contents are respectively 2.36g / L, 0.165g / L, 0.83g / L and 14.47g / L laterite nickel ore normal pressure acid leaching solution mixed with 5wt.% NaOH solution to adjust the solution The pH is 9, while adding 30wt.% of H 2 o 2 The solution was reacted at 20°C for 1 hour, and the reacted solution was subjected to liquid-solid separation, and the filtrate mainly contained a large amount of Mg 2+ , Ni 2+ 、Co 2+ and Mn 2+ Mainly precipitated as Ni(OH) 2 、Co(OH) 2 and MnO 2 ; The obtained slag and 10wt.% HCl are controlled at room temperature (20° C.) to have a pH of 1, and the reaction is performed for 1 h. At this time, Ni(OH) 2 、Co(OH) 2 dissolved, MnO 2 Undissolved, filtered, residue MnO 2Carry out oven dry (120 ℃), purity requirement can satisfy industrial application; At this moment, the rate of recovery of Ni, Co, Mn and Mg is respectively 97.1%, 90.2%, 92.7% and 99.8%; % NaOH, 30wt.% H 2 o 2 , the temperature is 20°C, the pH is 9, and t...

Embodiment 2

[0032] The Ni, Co, Mn and Mg contents are respectively 2.35g / L, 0.17g / L, 0.93g / L and 15.13g / L of laterite nickel ore normal pressure acid leaching solution mixed with 10wt.% NaOH solution to adjust the solution The pH is 7.5, while adding 5wt.% of H 2 o 2 The solution was reacted at a temperature of 50°C for 1.5 hours, and the reacted solution was subjected to liquid-solid separation, and the filtrate mainly contained a large amount of Mg 2+ , Ni 2+ 、Co 2+ and Mn 2+ Mainly precipitated as Ni(OH) 2 、Co(OH) 2 and MnO 2 ; The resulting slag and 15wt.% of HCl are controlled at room temperature (20°C) to have a pH of 3, and react for 0.5h. At this time, Ni(OH) 2 、Co(OH) 2 dissolved, MnO 2 Undissolved, filtered, residue MnO 2 Carry out oven dry (80 ℃), purity requirement can meet industrial application; At this moment, the rate of recovery of Ni, Co, Mn and Mg is respectively 98.5%, 91.2%, 93.1% and 98.9%; % NaOH, 10wt.% H 2 o 2 , the temperature is 50°C, the pH is 7.5,...

Embodiment 3

[0034] The Ni, Co, Mn and Mg contents are respectively 2.30g / L, 0.16g / L, 0.84g / L and 14.41g / L laterite nickel ore normal pressure acid leaching solution mixed with 55wt.% NaOH solution to adjust the solution The pH is 10, while adding 20wt.% of H 2 o 2 The solution was reacted at a temperature of 50°C for 0.5h, and the reacted solution was subjected to liquid-solid separation, and the filtrate mainly contained a large amount of Mg 2+ , Ni 2+ 、Co 2+ and Mn 2+ Mainly precipitated as Ni(OH) 2 、Co(OH) 2 and MnO 2 ; The obtained slag and 2.5wt.% HCl are controlled at 50°C to have a pH of 0.5, and react for 3 hours, at which point Ni(OH) 2 、Co(OH) 2 dissolved, MnO 2 Undissolved, filtered, residue MnO 2 Carry out oven dry (100 ℃), purity requirement can satisfy industrial application; At this moment, the rate of recovery of Ni, Co, Mn and Mg is respectively 96.8%, 90.5%, 91.7% and 95.3%; % NaOH, 20wt.% H 2 o 2 , the temperature is 50°C, the pH is 10, and the reaction is ...

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Abstract

The invention belongs to the field of wet metallurgy, and particularly discloses a clean production method for separating manganese and magnesium from a laterite-nickel ore normal-temperature acid leaching liquid employing alkaline oxidation. The technology mainly comprises two processes: alkaline oxidation and dilute acid dissolution. Mn<2+> in a cobalt-nickel solution is oxidized into MnO2 by the oxidability of H2O2 under an alkaline condition; meanwhile, the pH of the solution is adjusted; and participation of Mg in a form of Mg(OH)2 is avoided. The MnO2 has the property of not being dissolved into dilute acid, so that Mn can be separated from the cobalt-nickel solution by a method of dissolving diluted hydrochloric acid. According to the technology, manganese and magnesium in the cobalt-nickel solution can be effectively separated; the manganese and magnesium products and nickel-cobalt hydroxide slag with relatively good quality are obtained; and comprehensive utilization of resources is improved.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy. Specifically, the invention relates to a clean production method for separating manganese and magnesium from laterite nickel ore normal-pressure acid leaching solution by alkaline oxidation. Background technique [0002] There are many wet treatment methods for lateritic nickel ore, mainly including reduction roasting-ammonia leaching, biological leaching, high-pressure leaching, atmospheric pressure leaching, etc. The main advantage of the reduction roasting-ammonia leaching method is that the ammonia medium can be recycled, the consumption is small, and it is suitable for treating ores with high MgO content, but the leaching rate of cobalt is low, the method process is long, and the limitations of the ore types Large; bioleaching can treat low-grade ore, but the oxidation rate is slow, the leaching time is long, and the selection of strains is difficult; the high-pressure leaching method is suita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B23/00C22B26/22C22B47/00
CPCY02P10/20
Inventor 曲景奎孟龙郭强齐涛张培育韩林芯
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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