A method for comprehensive recovery of NdFeB waste acid leaching slag flash reduction supergravity slag financial fraction
A waste acid, NdFeB technology, applied in the direction of improving process efficiency, can solve the problems of no comprehensive utilization method, high equipment requirements, environmental pollution, etc., and achieve good popularization and application value, accurate atmosphere control, and environmental friendly effects.
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Embodiment 1
[0027] After mixing the powdered NdFeB waste acid leaching slag with a particle size of 100 mesh with 6% CaO powder of the slag weight, the nozzle (1) together with hydrogen is sprayed into a reaction tower with a height of 3.5 meters and a temperature of 1200℃ (2) The material floats from the upper end of the reaction tower to the lower end in a highly dispersed floating state. During this process, the reaction atmosphere is controlled to make the oxygen partial pressure 10 -16 Atm, 63.5% of the iron oxide in the material is reduced to metallic iron, while the rare earth oxide in the material is not reduced. When the high-temperature melt obtained by the reduction in the reaction tower falls to the sedimentation tank (3) below the reaction tower, it passes through the 1350℃ hot coke layer set above the sedimentation tank, and the unreduced iron oxide is further reduced to metallic iron At this time, the total iron reduction rate reaches 99.5%. The molten iron and rare earth sl...
Embodiment 2
[0030] The powdery NdFeB waste acid leaching residue with a particle size of 200 meshes and 5% SiO by weight of the residue 2 After the powder is mixed, it is sprayed together with hydrogen from the nozzle (1) into a reaction tower (2) with a height of 5.5 meters and a temperature of 1300°C. The materials are floating in a highly dispersed state from the upper end of the reaction tower to the lower end. During this process In, control the reaction atmosphere to make the oxygen partial pressure 10 -18 Atm, 72.6% of the iron oxide in the material is reduced to metallic iron, while the rare earth oxide in the material is not reduced. When the high-temperature melt obtained by reduction in the reaction tower falls to the sedimentation tank (3) below the reaction tower, it passes through the 1450°C hot coke layer set above the sedimentation tank, and the unreduced iron oxide is further reduced to metallic iron At this time, the total iron reduction rate reached 99.6%. The molten iro...
Embodiment 3
[0033] The powdery NdFeB waste acid leaching slag with a particle size of 300 mesh and 3% SiO by weight of the slag 2 After mixing the powder and 2% CaO powder, they are sprayed together with carbon monoxide gas into a reaction tower (2) with a height of 8.5 meters and a temperature of 1300℃ from the nozzle (1). The materials are floating in a highly dispersed state from the upper end of the reaction tower Floating to the lower end, in the process, control the reaction atmosphere to make the oxygen partial pressure 10 -20 Atm, 85.3% of the iron oxide in the material is reduced to metallic iron, while the rare earth oxide in the material is not reduced. When the high-temperature melt obtained by reduction in the reaction tower falls to the sedimentation tank (3) below the reaction tower, it passes through the 1550°C hot coke layer set above the sedimentation tank, and the unreduced iron oxide is further reduced to metallic iron At this time, the total iron reduction rate reaches ...
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