Method for collecting nickel and cobalt from laterite-nickel ore lixivium

Abstract

The invention discloses a method for separating enriched nickel and cobalt from a laterite nickel ore lixivium, which comprises the following steps: after solid and liquid separation between the laterite nickel ore lixivium and ore slag is implemented, a vulcanizing agent is added into the lixivium, the solid and the liquid are separated after reaction precipitation, and precipitated solid is washed by a new lixivium, thus obtaining sulfide precipitate; after the sulfide precipitate is pulpified, sulphuric acid and solution of nitric acid and mixed acid are added so as to implement oxidizing leaching; the goethite method is adopted for removing iron from a superior pickle liquor; a sodium thiosulfate solution is added so as to implement copper removing; a filtering liquor that is the enriched nickel and cobalt solution is obtained. Compared with the prior art, the method for separating enriched nickel and cobalt from the laterite nickel ore lixivium is implemented at normal temperatureand normal pressure, does not need a high-pressure caldron, has less device investment, low running cost, simple technical path, short process and controllable production scale; the vulcanizing agentand acids that are used in the technique can be recycled to the utmost extent and do not have emissions and environment pollution; the extraction yield of nickel and cobalt can achieve over 95 percent, and the method for separating enriched nickel and cobalt from the laterite nickel ore lixivium has low production cost and easy industrialization.

Description

technical field

[0001] The invention relates to the field of nonferrous hydrometallurgy, in particular to a method for extracting nickel cobalt from nickel ore. Background technique

[0002] There are two types of nickel resources that can be mined in the world: one is nickel sulfide ore, accounting for 40% of land nickel resources, and the other is nickel oxide ore (commonly known as laterite nickel ore), accounting for 60%. While 55% of nickel products in the world are extracted from sulfide ore, less than 45% of nickel is extracted from laterite nickel ore. However, with continuous mining, nickel sulfide ore resources are becoming less and less, and lateritic nickel ore has been considered as the main nickel resource for future development.

[0003] The grades of nickel, cobalt and copper in laterite ore are low, so it is not suitable for pyrometallurgy. Two hydrometallurgical processes are often used: one is reduction roasting and ammonia leaching process (RRAL), and th...

Examples

Embodiment 1

[0021] A. Put 25 liters of laterite ore leaching solution into a 50 liter reaction vessel, in the leaching solution: Ni 6g / L, Fe 33g / L, Cu 1g / L, Co 0.98g / L, Mg 3.3g / L, Zn 0.57g / L. Ammonium sulfide is dropped into 1.2 times the stoichiometric ratio of the metal equivalent in the leaching solution, and the pH value rises to 3.0;

[0022] B. After the solid-liquid separation of the precipitate, wash the precipitate with a new leaching solution for 10 minutes, and the pH rises to 1;

[0023] C. After the sulfide precipitation after washing and soaking, ferrous sulfide accounts for 5.6% of the total sulfide precipitation mass after solid-liquid separation, add water to it to form a slurry with a solid-liquid ratio of 1:3, and activate it by mechanical stirring in a stirring tank for 15 minutes , stirring speed 280rpm;

[0024] D, the slurry after activation is added sulfuric acid nitric acid mixed acid (sulfuric acid: the volume ratio of nitric acid is 90: 10) solution by 1.5 ti...

Embodiment 2

[0028] A, drop 50 liters of leachate containing Ni 4.4g / L, Fe 38g / L, Cu 0.78g / L, Co 0.88g / L, Mg 2.3g / L, Zn 0.69g / L laterite sulfuric acid system into 100 liters of In the reaction kettle, sodium sulfide is added according to 1.3 times the stoichiometric ratio of the metal amount, and the pH value rises to 3.46.

[0029] B. Fully wash the sulfide precipitate after the solid-liquid separation in the previous step with the new leachate for 15 minutes, raise the pH to about 1 and perform solid-liquid separation;

[0030] C, the solid phase after the separation of the previous step is slurried by a solid-to-liquid ratio of 1: 3, the slurry is mechanically stirred and activated for 20 minutes, the stirring speed is 300rpm, and ferrous sulfide in the solid phase accounts for 10.4% of the total precipitated mass of sulfide;

[0031] D, add sulfuric acid nitric acid mixed acid (sulfuric acid: the volume ratio of nitric acid is 90: 10) solution to the slurry after activation by relative...

Embodiment 3

[0035] A. Put 25 liters of laterite ore sulfuric acid system leaching solution into a 50 liter reaction vessel, in the leaching solution: Ni 6g / L, Fe 36g / L, Cu 1g / L, Co 0.68g / L, Mg 4.3g / L, Zn 0.55g / L. Ammonium sulfide is added according to 1.5 times the amount of metal in the leaching solution, and the pH value rises to 3.5;

[0036] B. After the solid-liquid separation of the precipitate, the precipitate is fully washed with the new leachate for 20 minutes, and the pH rises to 1;

[0037] C, after the sulfide precipitation after washing and soaking, ferrous sulfide accounts for 5.9% of the total sulfide precipitation mass after solid-liquid separation, it is added with water to form a slurry with a solid-to-liquid ratio of 1: 3, and is activated by mechanical stirring in a stirring tank for 30 Minutes, stirring speed 320rpm;

[0038] D. Add sulfuric acid and nitric acid mixed acid to the activated slurry according to 1.5 times the metal equivalent stoichiometric ratio in th...

technical field

[0001] The invention relates to the field of nonferrous hydrometallurgy, in particular to a method for extracting nickel cobalt from nickel ore. Background technique

[0002] There are two types of nickel resources that can be mined in the world: one is nickel sulfide ore, accounting for 40% of land nickel resources, and the other is nickel oxide ore (commonly known as laterite nickel ore), accounting for 60%. While 55% of nickel products in the world are extracted from sulfide ore, less than 45% of nickel is extracted from laterite nickel ore. However, with continuous mining, nickel sulfide ore resources are becoming less and less, and lateritic nickel ore has been considered as the main nickel resource for future development.

[0003] The grades of nickel, cobalt and copper in laterite ore are low, so it is not suitable for pyrometallurgy. Two hydrometallurgical processes are often used: one is reduction roasting and ammonia leaching process (RRAL), and th...

Examples

Embodiment 1

[0021] A. Put 25 liters of laterite ore leaching solution into a 50 liter reaction vessel, in the leaching solution: Ni 6g / L, Fe 33g / L, Cu 1g / L, Co 0.98g / L, Mg 3.3g / L, Zn 0.57g / L. Ammonium sulfide is dropped into 1.2 times the stoichiometric ratio of the metal equivalent in the leaching solution, and the pH value rises to 3.0;

[0022] B. After the solid-liquid separation of the precipitate, wash the precipitate with a new leaching solution for 10 minutes, and the pH rises to 1;

[0023] C. After the sulfide precipitation after washing and soaking, ferrous sulfide accounts for 5.6% of the total sulfide precipitation mass after solid-liquid separation, add water to it to form a slurry with a solid-liquid ratio of 1:3, and activate it by mechanical stirring in a stirring tank for 15 minutes , stirring speed 280rpm;

[0024] D, the slurry after activation is added sulfuric acid nitric acid mixed acid (sulfuric acid: the volume ratio of nitric acid is 90: 10) solution by 1.5 ti...

Embodiment 2

[0028] A, drop 50 liters of leachate containing Ni 4.4g / L, Fe 38g / L, Cu 0.78g / L, Co 0.88g / L, Mg 2.3g / L, Zn 0.69g / L laterite sulfuric acid system into 100 liters of In the reaction kettle, sodium sulfide is added according to 1.3 times the stoichiometric ratio of the metal amount, and the pH value rises to 3.46.

[0029] B. Fully wash the sulfide precipitate after the solid-liquid separation in the previous step with the new leachate for 15 minutes, raise the pH to about 1 and perform solid-liquid separation;

[0030] C, the solid phase after the separation of the previous step is slurried by a solid-to-liquid ratio of 1: 3, the slurry is mechanically stirred and activated for 20 minutes, the stirring speed is 300rpm, and ferrous sulfide in the solid phase accounts for 10.4% of the total precipitated mass of sulfide;

[0031] D, add sulfuric acid nitric acid mixed acid (sulfuric acid: the volume ratio of nitric acid is 90: 10) solution to the slurry after activation by relative...

Embodiment 3

[0035] A. Put 25 liters of laterite ore sulfuric acid system leaching solution into a 50 liter reaction vessel, in the leaching solution: Ni 6g / L, Fe 36g / L, Cu 1g / L, Co 0.68g / L, Mg 4.3g / L, Zn 0.55g / L. Ammonium sulfide is added according to 1.5 times the amount of metal in the leaching solution, and the pH value rises to 3.5;

[0036] B. After the solid-liquid separation of the precipitate, the precipitate is fully washed with the new leachate for 20 minutes, and the pH rises to 1;

[0037] C, after the sulfide precipitation after washing and soaking, ferrous sulfide accounts for 5.9% of the total sulfide precipitation mass after solid-liquid separation, it is added with water to form a slurry with a solid-to-liquid ratio of 1: 3, and is activated by mechanical stirring in a stirring tank for 30 Minutes, stirring speed 320rpm;

[0038] D. Add sulfuric acid and nitric acid mixed acid to the activated slurry according to 1.5 times the metal equivalent stoichiometric ratio in th...

Images