Method of enriching nickel concentrates from low-level laterite-nickel ore
A laterite nickel ore and low-grade technology, which is applied in the fields of chemical mineral processing and metallurgy and chemical science, can solve the problems of ineffective selective reduction and achieve high reduction performance and cleanliness, low reduction temperature, and avoid pollution
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Embodiment 1
[0025] The low-grade laterite nickel ore (TNi: ~1.34 wt.%) was crushed to 4-6mm with a jaw crusher, and then dried in an oven at 80°C. The dried laterite nickel ore is ground with a rod mill to a fineness of -0.15mm, accounting for more than 90%, and placed in a muffle furnace for pre-roasting. Then separately add sodium thiosulfate (Na 20% by weight of laterite nickel ore) to the pre-roasted laterite nickel ore. 2 S 2 O 3 ), or potassium thiosulfate (K 2 S 2 O 3 ), or calcium thiosulfate (CaS 2 O 3 ), or barium thiosulfate (BaS 2 O 3 ) additives, add an appropriate amount of water to knead after uniform mixing, put them into an extruder and extrude to obtain columnar particles with a diameter of 3 to 5 mm and a length of 5 to 10 mm. . Put the dried laterite nickel ore into the fixed bed reaction device under inert gas N 2 Heating in the atmosphere to 1200 ℃, and then introducing a mixed gas containing 80% CO reduction gas by volume, the mixed gas space velocity is ...
Embodiment 2
[0027]Low-grade laterite nickel ore (TNi: ~1.34 wt.%) is crushed to 4-6mm with a jaw crusher, then dried in an oven at 80°C, and the dried laterite nickel ore is ground to fineness with a rod mill -0.15mm accounts for more than 90%, put it in the muffle furnace for pre-roasting, add 5%, 10%, 15%, 20% and 25% of the weight of laterite nickel ore to the pre-roasted laterite nickel ore respectively Sodium sulfate (Na 2 S 2 o 3 ) additives, mixed evenly and kneaded with appropriate amount of water, placed in extruder and extruded to obtain columnar particles with a diameter of 3 to 5 mm and a length of 5 to 10 mm, and the columnar particles were dried in a drying oven to obtain dried and shaped laterite nickel ore . Put the dried laterite nickel ore into the fixed bed reaction device under the inert gas N 2 Heating in the atmosphere to 1200°C, and then passing a mixed gas containing 80% CO reducing gas by volume fraction, the space velocity of the mixed gas is 1000h -1 , the ...
Embodiment 3
[0029] Low-grade laterite nickel ore (TNi: ~1.34 wt.%) is crushed to 4-6mm with a jaw crusher, then dried in an oven at 80°C, and the dried laterite nickel ore is ground to fineness with a rod mill -0.15mm accounts for more than 90%, put it in the muffle furnace for pre-roasting, add 20% sodium thiosulfate (Na 2 S 2 o 3 ) additives, mixed evenly and kneaded with appropriate amount of water, placed in extruder and extruded to obtain columnar particles with a diameter of 3 to 5 mm and a length of 5 to 10 mm, and the columnar particles were dried in a drying oven to obtain dried and shaped laterite nickel ore . Put the dried laterite nickel ore into the fixed bed reaction device under the inert gas N 2 The atmosphere is heated to a given temperature of 800°C, 900°C, 1000°C, 1100°C, and 1200°C respectively, and then a mixed gas containing a volume fraction of 80% CO reducing gas is introduced, and the space velocity of the mixed gas is 1000h -1 , the reduction roasting time is...
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