System and method for directly reducing laterite-nickel ore through hydrogen shaft furnace dry-method self-reforming
A technology of laterite nickel ore and shaft furnace, which is applied in the field of laterite nickel ore smelting, can solve the problems of low production efficiency of direct reduced iron, low methane cracking rate, poor catalytic effect, etc., so as to avoid catalyst deactivation, improve smelting efficiency, clean production effect
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[0048] Example 1
[0049] Natural gas is selected as the reducing gas. After desulfurization, the natural gas is sent to a heating furnace and heated to 1050°C. Then enter the hydrogen shaft furnace through the hot reducing gas inlet in the middle of the hydrogen shaft furnace. The laterite nickel ore oxidized pellets are fed into the receiving hopper on the top of the hydrogen shaft furnace. Among them, in the laterite nickel ore oxidized pellets, the mass content of nickel is 0.8%, and the mass content of iron is 35%. After thermally reducing it into the hydrogen shaft furnace, under the condition of iron and nickel as the catalyst, through the cracking and self-reforming reaction, the synthesis reducing gas is produced, where H 2 The volume fraction of CO and CO is 93%. And H 2 / CO is 1.6. The synthetic reducing gas moves upwards, heating and reducing the laterite nickel ore oxidized pellets moving from top to bottom in the upper part of the hydrogen shaft furnace, and the
Example Embodiment
[0050] Example 2
[0051] Natural gas is selected as the reducing gas. After desulfurization, the natural gas enters the heating furnace and is heated to 1050°C. Then enter the hydrogen shaft furnace through the hot reducing gas inlet in the middle of the hydrogen shaft furnace. The laterite nickel ore oxidized pellets are fed into the receiving hopper on the top of the hydrogen shaft furnace. Among them, in the laterite nickel ore oxidized pellets, the mass content of nickel is 1.7%, and the mass content of iron is 20%. After the hot reducing gas enters the hydrogen shaft furnace, under the condition of iron and nickel as the catalyst, through the cracking and self-reforming reaction, the synthetic reducing gas is produced. 2 The volume fraction of CO and CO is 95%. And H 2 / CO is 1.6. The synthetic reducing gas moves upwards, heating and reducing the laterite nickel ore oxidized pellets moving from top to bottom in the upper part of the hydrogen shaft furnace, and the reduct
Example Embodiment
[0052] Example 3
[0053] Use coke oven gas as the reducing gas. The coke oven gas enters the heating furnace after desulfurization and is heated to 950°C. Then enter the hydrogen shaft furnace through the hot reducing gas inlet in the middle of the hydrogen shaft furnace. The laterite nickel ore oxidized pellets are fed into the receiving hopper on the top of the hydrogen shaft furnace. Among them, in the laterite nickel ore oxidized pellets, the mass content of nickel is 1.7%, and the mass content of iron is 20%. After the hot reducing gas enters the hydrogen shaft furnace, under the condition of iron and nickel as the catalyst, through the cracking and self-reforming reaction, the synthetic reducing gas is produced. 2 The volume fraction of CO and CO is 93%. And H 2 / CO is 1.8. The synthetic reducing gas moves upwards, heating and reducing the laterite nickel ore oxidized pellets moving from top to bottom in the upper part of the hydrogen shaft furnace, and the reduction ti
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