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Method for recovering nickel and magnesium elements from high-magnesium low-grade nickel sulfide ore

A nickel sulfide ore, low-grade technology, applied in the direction of improving process efficiency, can solve the problems of low leaching rate, environmental pollution, high energy consumption, etc.

Inactive Publication Date: 2012-07-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the existing problems of large energy consumption, low leaching rate and serious environmental pollution in the processing of high-magnesium type low-grade nickel sulfide ore in the prior art

Method used

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  • Method for recovering nickel and magnesium elements from high-magnesium low-grade nickel sulfide ore
  • Method for recovering nickel and magnesium elements from high-magnesium low-grade nickel sulfide ore
  • Method for recovering nickel and magnesium elements from high-magnesium low-grade nickel sulfide ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Mix -200 mesh ore sample with ammonium sulfate in a ratio of 5:1, roast at 350°C for 1.5h, and then leaching with aqueous solution for 1h.

[0029] (2) Carry out solid-liquid separation of the infusion, and leaching the filter residue with Thiobacillus ferrooxidans for 7 days. The leaching conditions are: solid-liquid ratio 1:10, temperature 30±2°C, inoculum size 15%, rotation speed 170rpm, pH value 2.2 . After two-stage leaching, the leaching rates of nickel and magnesium ions were 87.12% and 56.38%, respectively.

[0030] (3) Rice husks were filled into an upflow fixed-bed reactor to immobilize sulfate-reducing bacteria. The packing density is 0.05g / ml. at 6000mL·L -1 d -1 Pump the mixed leaching solution into the fixed-bed reactor at an injection rate of 2 h, and 73% of the nickel ions in the solution are adsorbed.

[0031] (4) Crystallize the solution obtained in the step (3), and control the crystallization temperature to 10°C to obtain magnesium sulfate h...

Embodiment 2

[0034] (1) Mix -200 mesh ore sample with ammonium sulfate in a ratio of 5:2, roast at 400°C for 2 hours, and then leaching with aqueous solution for 2 hours.

[0035] (2) Carry out solid-liquid separation of the infusion, and leaching the filter residue with Thiobacillus ferrooxidans for 10 days. The leaching conditions are: solid-liquid ratio 1:10, temperature 30±2°C, inoculum size 15%, rotation speed 170rpm, pH value 2.0 . After two-stage leaching, the leaching rates of nickel and magnesium ions were 90.37% and 60.54%, respectively.

[0036] (3) Rice husks were filled into an upflow fixed-bed reactor to immobilize sulfate-reducing bacteria. The packing density is 0.15g / ml. With 4800 mL·L -1 d -1 Pump the mixed leaching solution into the fixed-bed reactor at an injection rate of 4 h, and 87% of the nickel ions in the solution are adsorbed.

[0037] (4) Crystallize the solution obtained in the step (3), and control the crystallization temperature to 15° C. to obtain magne...

Embodiment 3

[0040] (1) Mix the -200 mesh ore sample with ammonium sulfate in a ratio of 5:4, roast at 450°C for 3 hours, and then leaching with dilute sulfuric acid solution for 3 hours.

[0041] (2) Separation of solid and liquid from the immersion liquid, leaching the filter residue with Thiobacillus ferrooxidans for 15 days, the leaching conditions are: solid-liquid ratio 1:20, temperature 30±2°C, inoculum size 15%, rotation speed 170rpm, pH value 1.8 . After two-stage leaching, the leaching rates of nickel and magnesium ions were 93.59% and 65.73%, respectively.

[0042] (3) Rice husks were filled into an upflow fixed-bed reactor to immobilize sulfate-reducing bacteria. The packing density is 0.1g / ml. at 3600mL·L -1 d -1 Pump the mixed leaching solution into the fixed-bed reactor at an injection rate of 8 hours, and 99% of the nickel ions in the solution are adsorbed.

[0043] (4) Crystallize the solution obtained in the step (3), and control the crystallization temperature to 20...

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Abstract

The invention belongs to the field of nonferrous metallurgy, and relates to a method for recovering nickel and magnesium elements from a high-magnesium low-grade nickel sulfide ore. The method comprises the main steps of ammonium sulfate roasting and leaching, bacterial leaching, Ni<2+> and Mg<2+> separation, solution crystallization, high-purity magnesium oxide preparation and the like. The method is characterized in that: nickel and magnesium in the high-magnesium low-grade nickel sulfide ore are leached by the two-section leaching process of ammonium sulfate roasting and bacterial leaching, sulfate reducing bacteria are fixed by rice hull, an upflow fixed bed reactor is constructed to adsorb and recover Ni<2+> in solution, magnesium sulfate in the solution is recovered by a solution crystallization method, and high-purity magnesium oxide is prepared by pyrolyzing the obtained magnesium sulfate. By the method, the nickel and magnesium elements in the high-magnesium low-grade nickel sulfide ore can be fully recycled, and the process is simple, low in energy consumption and environmental-friendly.

Description

technical field [0001] The invention designs a method for extracting nickel and magnesium elements from high-magnesium type low-grade nickel sulfide ore, and belongs to the field of nonferrous metallurgy. Background technique [0002] There are more than 80 proven nickel ore sites in my country, with a basic reserve of 10 million, ranking 8th in the world, among which sulfide ore accounts for 86% of the total nickel reserves, while the average grade of more than two-thirds of nickel sulfide ore is only 0.6% , and the MgO content in the ore is as high as 30-35%, which is a typical high-magnesium low-grade nickel sulfide ore. [0003] The existing wet treatment methods for low-grade nickel sulfide ore mainly include reduction roasting-ammonia leaching technology and atmospheric pressure acid leaching. The reduction roasting-ammonia leaching process has low nickel recovery rate, high energy consumption and serious environmental pollution. The atmospheric pressure acid leaching...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/00C22B26/22C22B3/08C22B3/18C22B3/24
CPCY02P10/20
Inventor 冯雅丽李浩然刘欣伟齐凤杰
Owner UNIV OF SCI & TECH BEIJING
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