A method for resource utilization of chromium-containing waste slag compound pellets by sintering method
A technology of composite pellets and chromium waste residue, applied in the field of metallurgy and environmental protection, can solve the problems of waste of resources, poor sinter strength, and high fuel consumption, and achieve the effects of increasing the probability of contact, increasing the roasting temperature, and increasing the reduction speed.
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Embodiment 1
[0033] First, mix chromium-containing waste slag, reducing agent and binder to prepare chromium slag composite pellets, and mix iron ore, flux, coke powder, etc. to make pellets, and then layer the composite pellets and pellets Distributed to the sintering machine for roasting to obtain chromium-containing sintered ore.
[0034] The chromium-containing waste slag is chromium salt slag, the reducing agent is coke powder and anthracite, the binder is bentonite (the addition amount is about 1% of the pellet material), the iron ore in the granular material is chromite, and the flux is quicklime.
[0035] In the middle layer of the composite pellets, the mass ratio of the carbon element in the coke powder to the oxygen element in the chromium slag is 0.5:1.
[0036] The diameter of the inner sphere is 2 mm, the diameter of the middle layer is 6 mm, and the diameter of the pellet is 10 mm.
[0037] The pelletizing time of the composite pellets is 12 minutes, and the pelletizing mac...
Embodiment 2
[0045] First, mix chromium-containing waste slag, reducing agent and binder to prepare chromium slag composite pellets, and mix iron ore, flux, coke powder, etc. to make pellets, and then layer the composite pellets and pellets Distributed to the sintering machine for roasting to obtain chromium-containing sintered ore.
[0046] The chromium-containing waste residue is stainless steel pickling mud, the reducing agent is coke powder and anthracite, the binding agent is bentonite (the addition amount is about 1% of the pellet material), and the iron ore in the granular material is a mixture of laterite nickel ore and magnetite. Mixture, the flux is quicklime and dolomite.
[0047] In the middle layer of the composite pellets, the mass ratio of the carbon element in the coke powder to the oxygen element in the chromium slag is 0.5:1.
[0048] The inner sphere has a diameter of 2 mm, the middle layer has a diameter of 6 mm, and the pellets have a diameter of 11 mm.
[0049] The ...
Embodiment 3
[0057] First, mix chromium-containing waste slag, reducing agent and binder to prepare chromium slag composite pellets, and mix iron ore, flux, coke powder, etc. to make pellets, and then layer the composite pellets and pellets Distributed to the sintering machine for roasting to obtain chromium-containing sintered ore.
[0058] The chromium-containing waste slag is ferrochrome slag, the reducing agent is coke powder and anthracite, the binder is bentonite (the addition amount is about 1% of the pellet material), the iron ore in the granular material is magnetite, and the flux is quicklime.
[0059] In the middle layer of the composite pellets, the mass ratio of the carbon element in the coke powder to the oxygen element in the chromium slag is 0.4:1.
[0060] The inner sphere has a diameter of 3 mm, the middle layer has a diameter of 7 mm, and the pellets have a diameter of 12 mm.
[0061] The pelletizing time of the composite pellets is 12 minutes, and the pelletizing machi...
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