Laterite-nickel-ore reduction and cooling method

[0037] A kind of laterite nickel ore reducing cooling method of the present invention comprises the following steps:

[0038] (1) Take 85wt% low-grade lateritic nickel ore containing 18.38% iron and 1.72% nickel, add 15wt% composite additives and mix in a mixer with a speed of 17r / min for 3 minutes, then add 10wt% water and continue mixing The mixture was obtained in 5 minutes, and the mixture was put into the feed box of a pair of roller presses, and pressed into agglomerates under a pressure of 60MPa. The composite additives include 15wt% water glass, 40wt% anthracite, 20wt% sodium humate and 25wt% limestone. The finished product rate of the dough is 81.35%, the drop strength is 95%, the compressive strength of the dough is 138N / piece, and the thermal burst index is 0.60%.

[0039] (2) In the raw agglomerate ore preheating system, use hot nitrogen to preheat the agglomerate to 900°C to obtain hot agglomerates. Put the hot agglomerate into the rotary kiln, and then reduce

[0043] A kind of laterite nickel ore reducing cooling method of the present invention comprises the following steps:

[0044](1) Take 80wt% low-grade lateritic nickel ore containing 18.38% iron and 1.72% nickel, add 20wt% composite additives and mix in a mixer with a speed of 17r / min for 3 minutes, then add 10wt% water and continue mixing The mixture was obtained in 5 minutes, and the mixture was put into the feed box of a pair of roller presses, and pressed into agglomerates under a pressure of 60MPa. The mixture is put into the feed box of the roller briquetting machine, and pressed into agglomerates under a pressure of 60MPa. The composite additives include 15wt% water glass, 40wt% anthracite, 20wt% sodium humate and 25wt% limestone. The finished product rate of the dough is 83.05%, the drop strength is 96%, the compressive strength of the dough is 149N / piece, and the thermal burst index is 0.40%.

[0045] (2) In the raw agglomerate preheating system, use hot nitrogen to

[0049] A kind of laterite nickel ore reducing cooling method of the present invention comprises the following steps:

[0050] (1) Take 85wt% low-grade lateritic nickel ore containing 18.38% iron and 1.72% nickel, add 15wt% composite additives and mix in a mixer with a speed of 17r / min for 3 minutes, then add 10wt% water, continue Mix for 5 minutes to obtain a mixture, put the mixture into the feed box of a pair of roller compactors, and press it into agglomerates under a pressure of 60MPa. The composite additives include 15wt% water glass, 40wt% anthracite, 20wt% sodium humate and 25wt% limestone. The finished product rate of the dough is 82.15%, the drop strength is 96%, the compressive strength of the dough is 142N / piece, and the thermal burst index is 0.50%.

[0051] (2) In the raw agglomerate preheating system, use hot nitrogen to preheat the raw agglomerates to 950°C to obtain hot agglomerates. Put the hot agglomerate into the rotary kiln, and then reduce it at 1250°C