Multi-functional composite additive for intensifying direct reduction of low-grade superfine hematite
A technology of composite additives and hematite, applied in the field of iron and steel metallurgy, to achieve the effect of improving quality, improving the grade of iron concentrate, and coarse particle size
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Embodiment 1
[0016] For the low-grade ultrafine hematite with a raw ore iron grade of 24.8% and an embedded particle size of 5-10 microns, the added components are ferric tetroxide: 45%, calcium carbonate: 45%, according to 8% of the raw ore iron quality. Sodium humate: 10% of the multifunctional composite additive of the present invention, when the reverse flotation-direct reduction-magnetic separation process is used to treat the low-grade ultrafine hematite with a raw ore iron grade of 24.8%, the obtained iron concentrate grade is 88.34 %, the iron recovery rate is 70%.
Embodiment 2
[0018] For the low-grade ultrafine hematite with a raw ore iron grade of 24.8% and an embedded particle size of 5-10 microns, the added components are ferric oxide: 50%, calcium carbonate: 40%, according to 8% of the raw ore iron quality. Sodium humate: 10% of the multifunctional composite additive of the present invention, when the reverse flotation-direct reduction-magnetic separation process is used to treat the low-grade ultrafine hematite with a raw ore iron grade of 24.8%, the obtained iron concentrate grade is 90.12 %, the iron recovery rate is 75.3%.
Embodiment 3
[0020] For the low-grade ultrafine hematite with a raw ore iron grade of 24.8% and an embedded particle size of 5-10 microns, the added components are ferric oxide: 55%, calcium carbonate: 35%, according to 8% of the raw ore iron quality. Sodium humate: 10% of the multifunctional composite additive of the present invention, when the reverse flotation-direct reduction-magnetic separation process is used to treat the low-grade ultrafine hematite with a raw ore iron grade of 24.8%, the obtained iron concentrate grade is 89.91 %, the iron recovery rate is 78.41%.
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