Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1994-09-20
1996-03-26
Andrews, Melvyn
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
588207, C21B 1100
Patent
active
055017215
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process for the preparation of pig iron and cement clinker in a fusion gasifier in which the charge is at least partially preheated, possibly deacidified and subjected to preliminary reduction or is used in the form of scrap, coal is blown into a fluidized bed and gasified with a reduction of the charge and pig iron and slag are drawn off in liquid form.
BACKGROUND OF RELATED ART
Processes for the preparation of pig iron in a fusion gasifier are normally optimized with regard to the required yield of pig iron, while at the same time in most conventional processes the economy is calculated by an appropriately high-quality product gas at the gasifier head. In such known processes the slag is selected with regard to the removal of contaminants from the pig iron bath, and, taking into account at the same time the energy utilization of the product gas without corresponding requirements being made of the quality of the iron bath, a slag bath which by no means fulfils satisfactory conditions as cement clinker is as a rule obtained.
SUMMARY OF THE INVENTION
The object of the invention is now to develop further a process of the aforementioned type so that pig iron and cement clinker can be directly produced in a fusion gasifier and that a series of contaminants can be safely disposed of during pig iron production. To solve this problem, the process in accordance with the invention consists essentially in the lime charge fed into the fusion gasifier being preheated, possibly together with a portion of iron ore, in a preheating shaft and calcined and charged according to the cement clinker composition required.
BRIEF DESCRIPTION OF THE DRAWING
The drawing illustrates an embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Through the fact that the lime charge is introduced according to the cement clinker composition required, the parameters necessary for the process in accordance with the invention are determined by the cement clinker quality. The use of slag as cement clinker assumes, as a rule, a fairly high CaO content, and hence the process in accordance with the invention can be applied for the simultaneous production of pig iron and cement clinker with charge material of much lower quality. The crude ore that can be used in accordance with the invention, unlike the usual charge materials in a conventional blast furnace, may have high proportions of CaO, SiO.sub.2 and Al.sub.2 O.sub.3, since these substances accompanying the ore represent components for clinker production. Since optimization with regard to improving the quality of the product gas hitherto usual for fusion gasification processes is now also not necessary, an economical procedure can be achieved by taking advantage of the heat balances in each case for clinker production. With the separate preheating of the lime marl, which is possibly mixed with iron ore, the material charged after preheating is first calcined and possibly sintered, when it is possible to use waste heat from the process directly for calcining and possibly sintering. The use of iron ore, and in particular a portion of the iron ore, for the lime charge preheated and calcined in this way leads at the same time to the formation of readily reducible ferrites which improve the iron yield.
In addition to iron ore of inferior quality with relatively high proportions of MgO, CaO, SiO.sub.2 and Al.sub.2 O.sub.3, the fusion gasifier may be charged with solid or liquid steelworks slag. Various carbon-containing substances, such as oil shale, communal and industrial waste or household refuse may be used at least in partial substitution as carbon and the use of a preheating shaft for the deacidification and preheating of a lime marl permits the adaptation of the lime charge to the required cement clinker composition in a much simpler manner and allows the management of the process with regard to the required cement clinker quality.
In addition to the carbon-carrying s
REFERENCES:
patent: 1842609 (1932-01-01), Hillhause
patent: 3052534 (1962-09-01), Bosley
patent: 3721548 (1973-03-01), Hodge
patent: 4063930 (1977-12-01), Kusner
patent: 4937065 (1990-06-01), Maurer et al.
patent: 5364446 (1994-11-01), Batterham et al.
"Holderbank" Financiere Glarus AG
Andrews Melvyn
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