WO2009132558A1 - A method of extracting ni and/or co - Google Patents

Abstract

A method of extracting Ni and/or Co comprises: atmospheric agitation leaching limonite-type ore at heated state to avoid slow velocity of heap leaching, and heap leaching serpentine-type ore to obtain higher leaching velocity.

Description

 Description A method for extracting nickel and/or cobalt

 Technical field

 [1] The present invention relates to a method for extracting nickel and/or cobalt, and in particular to a method for extracting nickel and/or cobalt from laterite nickel ore, in particular by using limonite type and serpentine type laterite A method in which nickel ore is separately collected and treated to extract nickel, cobalt, or nickel and cobalt. It belongs to the field of hydrometallurgy.

 Background technique

 [2] According to the prior art, a method for extracting nickel, cobalt, or nickel and cobalt from laterite nickel ore includes a heap leaching process of laterite nickel ore and a normal pressure agitation leaching process.

[3] However, in the existing heap leaching process, the serpentine type ore and the limonite type ore are mixed together for heap leaching, and as a result, the permeation speed is slow and the leaching period is long.

[4] In addition, in the existing atmospheric pressure heating and stirring leaching process, the serpentine type ore which can obtain the shorter leaching period by the available heap leaching process can not obtain the shorter leaching process with the heap leaching process. The periodic limonite-type ore is mixed and heated and stirred for leaching, resulting in too much processing capacity, high use of equipment, and high energy consumption.

 Disclosure of invention

 Summary of the invention

 [5] In order to overcome the deficiencies of the prior art, it is an object of the present invention to provide a method for extracting nickel and/or cobalt which has a high leaching speed, a short leaching period, and a short process flow.

[6] Another object of the present invention is to provide a method for extracting nickel and/or cobalt, which is simple in equipment

, small quantity and small investment.

 [7] Another object of the present invention is to provide a method of extracting nickel and/or cobalt which is low in energy consumption and cost effective.

 [8] Another object of the present invention is to provide a method of extracting nickel and/or cobalt which has a high nickel leaching rate.

 [9] To this end, the present invention provides a method for extracting nickel and/or cobalt, comprising a heap leaching process and a normal pressure heating and stirring leaching process, characterized in that the limonite type ore is cooled by atmospheric pressure stirring. Take; and the serpentine type ore is leached by heap leaching.

[10] Preferably, nickel and cobalt, and nickel or cobalt are extracted from laterite nickel ore. Preferably, the atmospheric pressure agitation leaching process of the limonite type ore comprises the following process steps:

 Control the ore particle size to be less than lcm;

 According to ore / leaching agent (W / V) is 1.0: 1.5 ~

1.0:2.5 Adding a leaching agent with a concentration of 20~30%, and immersing for 48~4h at a temperature of 70~100 °C;

 The leached slurry is filtered, and the filter residue is washed with water, and the resulting leaching solution is used to prepare a nickel-cobalt product.

 Preferably, the heap leaching process of the serpentine type ore comprises the following process steps:

 Control the ore particle size to be less than 3cm, control the ore water content to be greater than 20%; the thickness of the ore layer is l~6m;

 Adding leaching agent with a concentration of 5~15%, let it naturally infiltrate from the upper part into the bottom; and formulating the collected leachate to make the nickel ion concentration of the leachate reach 1.5~5g/L, for preparing nickel-cobalt products The leachate with a nickel ion concentration of less than 1.2 g/L is returned to the leaching.

 Preferably, in step E, a leaching agent having a concentration of 5 to 15% is added from the top of the immersion column, and naturally flows into the bottom from the top for infiltration.

 Preferably, the leaching agent is an aqueous solution containing sulfuric acid, hydrochloric acid, or a mixed acid thereof.

 Preferably, the nickel-cobalt product is obtained from the obtained leachate.

 Preferably, the ore particle size is controlled by crushing the ore.

 Preferably, the ore having a particle size larger than lcm is crushed to control the ore particle size to be less than 1 cm; and the ore/immersion ore |J(W/V) is 1.0:

 2.3 Add 20% sulfuric acid solution, and immerse for 24h at 80 °C; filter the leaching slurry, wash the filter residue according to the liquid-solid ratio of 3 plus water, and use the leaching solution to prepare nickel-cobalt product.

 Preferably, the ore having a particle diameter of more than 3 cm is crushed, the ore particle size is less than 3 cm, the ore water content is 25%; the ore layer thickness is 5 m; the sulfuric acid aqueous solution is prepared according to the leaching agent concentration of 10%, and the leaching agent is added to the top of the ore layer. Let it be naturally infiltrated; collect the leachate in sections, concentrate the nickel-cobalt peak in the early stage of leaching, and mix the leachate to make the nickel ion concentration of the leachate reach 2g/L, for the nickel-cobalt product, the nickel ion concentration is less than 1. A 2 g/L leachate was used to return the leach.

According to the present invention, the serpentine-type ore in the laterite nickel ore is distilled to obtain a shorter leaching period and a high leaching rate, and the remaining limonite-type ore is heated and stirred at normal pressure. Leaching, making it easier [26] According to the present invention, the serpentine type ore and the limonite type ore in the laterite nickel ore are respectively subjected to different leaching processes, and the serpentine type ore is subjected to a heap leaching process to obtain a faster leaching speed. The limonite type ore is leached by the atmospheric pressure heating and stirring process, thereby avoiding the problem that the heap leaching speed is extremely slow and the leaching period is long.

 [27] Since the leaching performance of the serpentine type ore is better than that of the limonite type ore, the present invention is more suitable for the heap than the existing process of mixing the above two ores together for heap leaching or agitation leaching. The immersed serpentine ore is leached by a heap leaching method, which has a short cycle and a high leaching rate. The limonite type ore which is difficult to be leached is leached by the heating and stirring method, and the leaching rate is high, and the leaching rate is also high. Thus, such a combination process has better technical effects than a single heap leaching process or a single warming agitation leaching process. DRAWINGS

 [28] Figure 1 is a flow chart of atmospheric pressure stirring leaching process for preparing nickel-cobalt products from limonite ore.

[29] Figure 2 is a flow chart of column immersion (simulated heap leaching) for the preparation of nickel-cobalt products from serpentine ore.

 BEST MODE FOR CARRYING OUT THE INVENTION

[30] The inventors have found that serpentine-type ores have a shorter leaching period in the heap leaching process, while limonite-type ores have a longer leaching period.

[31] As shown in Fig. 1, the atmospheric pressure stirring leaching process for preparing nickel-cobalt products from limonite ore includes the following steps: ore preparation step 11, atmospheric pressure stirring leaching step 12, and solid/liquid separation Step 13, wherein the step 12 is performed by the inorganic acid application step 111, and the solid/liquid separation step 13 results in the production of the leachate 14 and the leach residue 15 for the nickel-cobalt product.

[32] In one embodiment of the atmospheric agitation leaching process for producing a nickel-cobalt product from a limonite-type ore, the following steps are specifically included:

 [33] A, crushing ore with a particle size larger than lcm, controlling the ore particle size to be less than lcm;

[34] B, by ore / leaching agent (W / V) is 1.0:

 2.3 adding 20% sulfuric acid solution, stirring at 80 ° C for 24 h;

 [35] C. The leaching slurry is filtered, and the filter residue is washed with a liquid-solid ratio of 3 plus water, and the leaching solution is used for preparing a nickel-cobalt product.

[36] In the present embodiment, the nickel leaching rate is 82.37%; and the nickel-cobalt-containing leachate can be treated by the prior art to obtain a nickel-cobalt product.

 [37] In other embodiments, the ore/leaching agent (W/V) may be 1.0: 1.5 ~ 1.0: 2.5,

The concentration of the leaching agent can be 20 ~ 30%, and the stirring temperature can be 70 ~ 100 °C. The leaching time can be 48 to 4 hours, and the object of the present invention can be achieved as well.

[38] As shown in Fig. 2, the column leaching method (simulation heap leaching) leaching process for preparing nickel-cobalt products from serpentine ore includes the following steps: ore preparation step 21, column leaching (simulation heap leaching) steps 22. Leaching Night Density Judging Step ₂₃ , wherein the column immersion (simulation heap leaching) step 22 comprises the inorganic acid application step 211, with the result that the leaching solution 24 and the leaching slag 25 for producing the nickel-cobalt product are produced.

[39] In one embodiment of a column leaching method (simulation heap leaching) leaching process for preparing a nickel-cobalt product from a serpentine type ore, the following steps are specifically included:

 [40] A. The ore with a particle size larger than 3cm is broken, the ore particle size is less than 3cm, and the ore water is about 25%;

 [41] B, material layer thickness 5m;

 [42] C. Prepare a sulfuric acid aqueous solution at a concentration of 10% of the leaching agent, and add a leaching agent to the top of the ore layer to allow natural infiltration;

 [43] D. Collect the leachate in sections. The nickel-cobalt peak solution is concentrated in the early stage of leaching. The leachate is prepared to make the nickel ion concentration of the leachate reach 2g/L, which is used to prepare nickel-cobalt product. The nickel ion concentration is less than 1.2g/ The leachate of L is used to return the leach.

 [44] In this example, after 38 days of leaching, the nickel leaching rate was 84.9%. The nickel-cobalt-containing leachate can be treated by the prior art to obtain a nickel-cobalt product.

[45] In other embodiments, the ore water content may be controlled to be greater than 20%; the material layer thickness may be 1 to 6 m, the concentration of the leaching agent may be 5 to 15%, and the leachate nickel ion concentration may be 1.5 to 5 g/ L, the object of the invention can also be achieved.

 [46] In particular, in each of the examples, the leaching agent is an aqueous solution containing sulfuric acid, hydrochloric acid, or a mixed acid thereof.

[47] It should be noted that, through the above disclosure, those skilled in the art may make such modifications, changes, and improvements after being inspired by the present invention. However, these are all included in the protection of the claims. Within the scope.

Claims

Claim  [1] A method for extracting nickel and/or cobalt, comprising a heap leaching process and a normal pressure heating and stirring leaching process, characterized in that the limonite type ore is immersed by atmospheric pressure and stirring; and the serpentine Stone type ore is leached by heap leaching.  [2] The method according to claim 1, characterized in that nickel and cobalt, and nickel or cobalt are extracted from laterite nickel ore.  [3] The method according to claim 1, wherein the atmospheric pressure heating and stirring leaching process of the limonite type ore comprises the following process steps:  Control the ore particle size to be less than lcm;  According to ore / leaching agent (W / V) is 1.0: 1.5  ~1.0:2.5 Adding a leaching agent with a concentration of 20~30%, and immersing for 48~4 h at a temperature of 70~100 °C;  The leached slurry is filtered, and the filter residue is washed with water, and the resulting leaching solution is used to prepare a nickel-cobalt product. [4] The method according to claim 1, wherein the heap leaching process of the serpentine type ore comprises the following process steps:  Control the ore particle size to be less than 3cm, and control the ore water content to be greater than 20%;  The thickness of the ore layer is l~6m;  Adding a leaching agent at a concentration of 5 to 15% for infiltration;  The collected leachate is prepared so that the nickel ion concentration in the leachate reaches 1.5~5g/L, and the nickel-cobalt product is prepared, and the leach solution with the nickel ion concentration less than 1.2g/L is returned to the leach. [5] The method according to claim 4, characterized in that in step E, a leaching agent having a concentration of 5 to 15% is added from the top of the ore layer, and naturally flows into the bottom from the top for infiltration. [6] The method according to claim 3 or 4, wherein the leaching agent is an aqueous solution containing sulfuric acid, hydrochloric acid, or a mixed acid thereof. [7] The method according to claim 3 or 4, characterized in that the nickel-cobalt plant is prepared from the obtained leachate. [8] The method according to claim 3 or 4, characterized in that the ore particle size is controlled by crushing the ore. [9] The method according to claim 3, characterized in that  The ore having a particle size larger than lcm is crushed, and the ore particle size is controlled to be less than lcm;  By ore / leaching agent (WA is 1.0  :2.3 adding 20% sulfuric acid solution, stirring at 80 ° C for 24 h;  The leached slurry is filtered, and the filter residue is washed with a liquid-solid ratio of 3 plus water, and the leaching solution is used to prepare a nickel-cobalt product. [10] The method of claim 4, characterized in that The ore with a particle size larger than 3cm is crushed, the ore particle size is less than 3cm, the ore water is 25%, and the ore layer thickness is _5m;  Prepare a sulfuric acid aqueous solution at a concentration of 10% of the leaching agent, and add a leaching agent from the top of the ore layer to allow natural infiltration;  The leachate is collected in sections, and the nickel-cobalt peak liquid is concentrated in the early stage of leaching. The leachate is prepared to make the leachate nickel ion concentration reach 2g/L, which is used to prepare nickel-cobalt product, and the nickel ion concentration is less than 1.2g/L. Return to the mine.