New discovery of Philippine laterite nickel minerals and nickel ferrochrome

The Philippine laterite nickel ore is a nickel silicate deposit formed by serpentine petrochemical alteration and long-term weathering. The mineral composition is complex, the particle size is fine, the crystal is poor, the mixing phenomenon is serious, and it is brittle, and the material composition research is difficult. Utilization of Mineral Resources, Institute of Chinese Academy of Geological Sciences mineral composition of Philippine laterite nickel and nickel-chromium-iron technology research project established the material composition of the laterite nickel ore, ore sample consisting of partial small particle size, particle size distribution with the following 0.075mm 0.04mm or less Mainly. Nickel minerals are mainly silicate minerals and oxide minerals. Process Mineralogy identified nickel mineral serpentine nickel (also known as silicon, magnesium nickel), nickel-cobalt bauxite, (including cobalt) nickel-manganese ore, pentlandite; nickel-containing minerals are serpentine, green Mudstone, limonite, Iding stone, etc.

Iron appears in the form of limonite in red clay and is a weathered ultrabasic rock. Under the weathering of red clay, olivine, pyroxene and other minerals rich in low-cost iron are oxidatively decomposed in the oxidation zone, and low-cost iron is converted into high-valent iron. The solubility of high-valent iron minerals is small and stable in the oxidation zone. Therefore, it remains on the surface of the earth, so that the upper ore contains more than 50% of iron. Meanwhile, internal residual byproducts ore original rock ultrabasic rocks - silicate nickel chromite, chrome spinel, titanium, iron and the like formed by weathering, cobalt-containing manganese and other hard, so that be rich in iron ore, manganese, nickel, cobalt and other "natural iron alloy", it can be used directly for high-quality steel smelting.

The Institute of Mineral Comprehensive Utilization of the Chinese Academy of Geological Sciences has adopted a combination of heavy and magnetic methods to study the performance of ore. It has a good effect on the enrichment and separation of chromite ore, and it can obtain a chromium concentrate product containing 3.18% chromium oxide. And nickel ore products containing 1.96% nickel and 0.62 chromium oxide reduced to 0.65%. In a normal pressure of 100 ° C, 50% concentration of sulfuric acid leaching time of 1 ~ 2 hours, nickel, cobalt leaching rate is higher, acid leaching method (wet method) recovery of nickel, cobalt, low nickel iron method ( The fire method) recovers nickel, cobalt and iron, has high recovery rate, simple process and low cost. After reduction and calcination, crushing, grinding and magnetic separation can obtain low nickel-iron alloy concentrate. The recovery of valuable metals is 99% nickel, 92% iron and 97% cobalt.

The research results of this technology have carried out detailed tests and tests on the state of nickel, chromium and iron and the process performance of ore utilization through process mineralogical research methods, which have played a positive role in guiding production and mineral processing research.

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