Method for adding additive agent in reducing roasting process of laterite nickle mine
A laterite nickel ore and additive technology, which is applied in the field of adding additives in the reduction roasting process of laterite nickel ore, can solve the problems of increasing the amount of segregating agent chloride, increasing the consumption of raw materials, and high production costs, so as to reduce the cost of chemical consumption and strengthen the metal effect, adding a small amount of effect
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Embodiment 1
[0033] Laterite nickel ore contains 1.38% Ni, 32.1% Fe and 12.7% Mg.
[0034] Take 100 parts of laterite nickel ore and grind to -200 mesh, accounting for 90%, add 6 parts of pulverized coal and additives (recipe and dosage are shown in Table 2), mix and grind them, and use a spherical egg forming machine to make 10-15mm pellets. Reduction roasting was carried out at 900° C. for 2 hours in a muffle furnace. The obtained reduced calcine is subjected to wet ball milling, the pulp concentration is 40%, and the grinding fineness is -200 mesh, accounting for 90%; the pulp is magnetically separated under the condition of a magnetic field strength of 8000 gauss, and the obtained concentrate contains Ni 4.89%, Fe 79.8%, the recovery rate of nickel is 91.5%.
[0035]Table 2 The additive formula and consumption of embodiment 1
[0036] component name specific compound Amount, % (relative to the quality of laterite nickel ore) chloride calcium chloride 5% Acc...
Embodiment 2
[0038] Low-iron and high-magnesium laterite nickel ore, the chemical composition contains Ni 1.95%, Fe 15.9%, Mg 17.8%.
[0039] Take 100 parts of laterite nickel ore and grind it to -200 mesh, accounting for 70%, add 5 parts of coking coal and additives (see Table 3 for the formula and dosage), mix and grind, and use a spherical egg forming machine to make pellets with a diameter of 10-15mm. The kiln is reduced and fired at 1100°C for 1.5 hours. The obtained reduced calcine is subjected to wet ball milling, the pulp concentration is 50%, and the grinding fineness is -200 mesh, accounting for 80%; the pulp is magnetically separated under the condition of a magnetic field strength of 9000 gauss, and the obtained concentrate contains 8.36% Ni, Fe 75.1%, the recovery rate of nickel is 95.2%.
[0040] Table 3 The additive formula and consumption of embodiment 2
[0041] component name specific compound Amount, % (relative to the quality of laterite nickel ore) ...
Embodiment 3
[0043] High-iron and low-magnesium laterite nickel ore, the chemical composition contains Ni 0.91%, Fe 47.8%, Mg 17.9%.
[0044] Take 100 parts of laterite nickel ore and grind it to -100 mesh, accounting for 90%, add 12 parts of pulverized coal and combined segregant (see Table 4 for the formula and dosage), mix and grind it, and use a spherical egg forming machine to make pellets of 10-15mm , using a rotary kiln to reduce and roast at 1250 ° C for 0.5 hours. The obtained reduced calcine is subjected to wet ball milling, the pulp concentration is 50%, and the grinding fineness is -400 mesh, accounting for 70%. 81.9%, the recovery rate of nickel is 88.8%.
[0045] The additive formula and consumption of table 4 embodiment 3
[0046] component name specific compound Amount, % (relative to the quality of laterite nickel ore) chloride calcium chloride 0% Accelerator Sodium carbonate 6% Nucleating agent Reduced iron powder 1% Sulfur fix...
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