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Treating method for high magnesium laterite nickel mine

A lateritic nickel ore and treatment method technology, applied in the field of metallurgy, can solve the problems of low leaching rate of nickel and cobalt metals, less demand for final product application, equipment corrosion, etc., achieve high-efficiency extraction, easy liquid-solid separation, and low production cost Effect

Inactive Publication Date: 2008-10-22
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
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Problems solved by technology

[0008] In summary, the inventors have found that when the prior art processes lateritic nickel ore, there are large energy consumption, severe equipment corrosion, or low leaching rates of valuable metals nickel and cobalt, or the acid-containing tail liquid needs to be treated before it can be recovered. Emissions, or there are problems in obtaining the final product with less application demand

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  • Treating method for high magnesium laterite nickel mine

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Embodiment 1

[0031] This embodiment provides a method for processing high-magnesium laterite nickel ore, mainly using nitric acid as the leaching medium, and leaching the high-magnesium laterite nickel ore in the nitric acid medium by a pressure acid leaching method. The processing flow of the method is as follows figure 1 As shown, it specifically includes the following steps:

[0032] (1) Pretreatment: crush and grind the high-magnesium laterite nickel ore. After treatment, the proportion of mineral particles with a particle size of less than 75μm in the total mineral material is not less than 80%, and generally accounts for 85% to 98%. Can

[0033](2) Pressure leaching: Using nitric acid as the leaching medium, the pretreated mineral material is mixed with the corresponding concentration of nitric acid solution according to a certain liquid-solid ratio, and then heated, stirred, and pressure leached in the autoclave after mixing. When the set temperature is reached, oxygen is introduced; th...

Embodiment 2

[0039] This embodiment provides a method for processing high-magnesium laterite nickel ore, which specifically includes: the composition of the high-magnesium laterite nickel ore used is: nickel Ni 1.10%, cobalt Co 0.021%, iron Fe 9.94%, magnesium Mg 17.67%, and dioxide Silicon SiO 2 38.60%, aluminum Al 1.37%. The pressure leaching conditions are: crush and ball mill the mineral material of the high-magnesia laterite nickel ore. After treatment, the mineral material particles with a particle size of 75μm account for 90% of the total mineral material. Take 50 grams of the mineral material in a 2L autoclave Leaching, the amount of nitric acid is 1.20gHNO 3 / g ore, used in nitric acid solution, leaching temperature is 150℃, leaching time: 60min, ratio of nitric acid solution volume to mineral material mass is 8:1, oxygen partial pressure is 0.10MPa, stirring speed is 300rpm. Crystal thermal decomposition process conditions: decomposition temperature 500℃, decomposition time 60min. Le...

Embodiment 3

[0041] This embodiment provides a method for processing high-magnesium laterite nickel ore, which specifically includes: the used high-magnesium laterite nickel ore composition: nickel Ni 0.95%, cobalt Co 0.019%, iron Fe 10.00%, magnesium Mg 17.58%, silicon dioxide SiO 2 38.10%, aluminum Al 1.40%. Pressure leaching conditions: high-magnesia laterite nickel ore with a particle size of 75μm accounted for 93% of the total amount of minerals, 50g of the mineral sample was leached in a 2L autoclave, and the amount of nitric acid was 1.25gHNO 3 / g ore, leaching temperature 150℃, leaching time: 60min, liquid-solid ratio 5:1, oxygen partial pressure 0.10MPa, stirring speed 500rpm. Crystal thermal decomposition process conditions: decomposition temperature 500℃, decomposition time 30min. Leaching rate: nickel Ni 95.74%, cobalt Co 94.50%, magnesium Mg 98.96%, aluminum Al 90.72%, Fe 0.76g / L in the leaching solution. The solution after iron removal contains 0.029g / L of iron, and the solution ...

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Abstract

The invention discloses a method for treating high magnesium laterite-nickel ores. The method comprises the following steps of preliminary treatment of ore, pressurized leaching, iron purification of leach solution, deposition of nickel and cobalt, condensation and crystallization, production of light magnesium oxide by low-temperature thermal decomposition of crystals and regeneration of nitric acid. Under mild conditions of low temperature and pressure, leaching ratios of nickel and cobalt both reach 95 percent, the leaching ratio of magnesium reaches 98 percent, the iron content in the leach solution is less than 1g / L, and no silicon dioxide is leached out. The method can fully recover nickel, cobalt and magnesium, and the magnesium is generated in the form of light magnesium oxide, and the leaching agent-nitric acid can be recovered and regenerated for n, thereby better resolving the problems of highly efficient leaching-out of nickel and cobalt and reasonable utilization of magnesium; moreover, the technical flow is simple and has low requirements on equipment, and in the process of leaching out, the scab phenomenon does not occur in a high-pressure pan, so that the method is applied to the large-scale industrial production.

Description

Technical field [0001] The invention relates to a processing technology of nickel oxide ore, in particular to a metallurgical processing method for leaching valuable metals such as nickel, cobalt, magnesium, and aluminum from high-magnesium laterite nickel ore and producing light magnesium oxide, and belongs to the field of metallurgical technology. Background technique [0002] Nickel is an important strategic substance, mainly used in the production of stainless steel, alloy steel, special alloy energy storage materials, and magnetic alloys. Nickel products are widely used in the fields of national defense, aviation, aerospace, transportation, petrochemical, machinery manufacturing, electrical instruments and energy materials. There is a serious shortage of nickel in our country, especially since 2000, the consumption of nickel in our country has increased significantly, and the situation of short supply has become very serious. Taking 2007 as an example, my country’s annual ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/06
CPCY02P10/20
Inventor 王成彦尹飞陈永强杨永强杨卜郜伟王忠阮书锋王军王念卫李敦钫揭晓武
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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