Hydrometallurgy method for treating low-grade laterite-nickel ore through normal pressure and pressurization combined acid leaching
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A technology for acid leaching treatment and laterite nickel ore, which is applied in the direction of improving process efficiency and can solve the problems of increased consumption of sulfuric acid, inability to develop and utilize economically and effectively, and low operating rate.
Inactive Publication Date: 2020-05-15
JINCHUAN GROUP LIMITED
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Therefore, the latter proton (acid) is not fully used for leaching, and causes excessive sulfuric acid to be neutralized and consume neutralizer in subsequent treatment; the third is that the HPAL process is limited to the processing of mainly limonite-based raw materials, because The presence of transition minerals will lead to a large increase in sulfuric acid consumption
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Embodiment 1
[0031] Table 1-1 Main Components of Ore
[0032] ore type Ni(%) Co(%) Fe(%) MgO(%) SiO 2 (%))
[0033] Take 500Kg of transition ore (dry) and add 500Kg of water to make transition slurry, prepare 500Kg of concentrated sulfuric acid with a mass fraction of 98%, heat the transition slurry to 60°C, and the concentrated sulfuric acid to 200°C, then use a mortar pump and a concentrated sulfuric acid pump to heat the The final transitional pulp and concentrated sulfuric acid are added to the feed port of the acid leaching reactor synchronously. After rapid mixing, the transitional pulp and concentrated sulfuric acid are forced to flow into the acid leaching reactor for rapid reaction to dissolve soluble non-ferrous metals and soluble iron. React for 1 minute Finally, the reaction materials are pushed out of the acid leaching reactor. Cool down to below 60°C,...
Embodiment 2
[0050] Organize embodiment 2 operation according to embodiment 1 step, the limonite implementation example result of table 2-1:
[0054] Element Ni co Fe Mg Si content(%) 0.22 0.043 17.96 1.37 11.75
[0055] Table 2-3 Statistical table of atmospheric pressure leachate components
[0056] Element Ni co Fe Mg Content (g / L) 3.23 0.036 102.01 0.21
[0057] Table 2-4 Statistical table of components of pressure leaching slag
[0058] Element Ni co Fe Mg Si content(%) 0.026 0.0017 59 0.17 0.06
[0059] Table 2-5 Statistical Table of Components of Pressurized Leach Solution
[0060] Element Ni co Fe Mg Content (g / L) ...
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Abstract
The invention relates to a hydrometallurgy method for treating low-grade laterite-nickel ore through normal pressure and pressurization combined acid leaching. The method comprises the following stepsthat transition ore pulp is prepared, the heated transition ore pulp and heated concentrated sulfuric acid are mixed according to a certain proportion, an acid leaching reaction is generated, and after water solution, normal-pressure leaching residues and normal-pressure lixivium are obtained through solid-liquid separation; limonite pulp is prepared, after the limonite pulp and the normal-pressure lixivium are mixed, heating is carried out, pressurization leaching is carried out under the conditions that the pressure ranges from 2.0 MPa to 4.0 MPa and the temperature ranges from 220 DEG C to240 DEG C, and after cooling, pressurization leaching residues and pressurization lixivium are obtained through solid-liquid separation; and briquetting and sintering processes are carried out on pressurization leaching residues to form iron powder. According to the hydrometallurgy method, acid consumption is low, the leaching rate of NiCoFe is high, the needed equipment cost is low, silicon andiron can be effectively separated, and iron concentrates high in iron content are obtained.
Description
technical field [0001] The invention relates to the technical field of hydrometallurgical technology of laterite nickel ore, in particular to a hydrometallurgical technology for treating low-grade laterite nickel ore with normal pressure and pressure combined with acid leaching. Background technique [0002] Due to the differences in geographical location, climatic conditions and weathering degree of laterite mines, the types of laterite mines around the world are not exactly the same. Highly regolith layers usually have most of their nickel finely distributed in finely divided goethite grains, this layer is often called limonite, and it generally contains a high proportion of iron and low proportions of silicon and magnesium. The nickel contained in the less weathered layers is generally more contained in various magnesium silicate minerals, such as serpentine. There may be many other nickel-containing silicate minerals in the partially weathered zone. Partially weathered...
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