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US 8,906,336 B2Granted
Blast furnace metallurgical coal substitute products and method
OwnerSiddhartha Gaur, Vibha Bansalinventors
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Abstract
A carbonaceous material substitute product for blast furnace metallurgical coal and method of making the carbonaceous material is disclosed. A metallurgical coal substitute material is made from non-metallurgical grade coal or other carbon sources.
Claims2
A process to produce a metallurgical coal substitute from feed material for use in a pulverized coal injection (PCI) process for blast furnace production of iron from iron ore, comprising:
- selecting a non-metallurgical coal carbon containing feed source as a carbon base for the metallurgical coal substitute to be produced;
- pulverizing the feed source carbonaceous material;
- controlling ash content of the feed source by measurement and adjustment to a low ash content wherein controlling ash content comprises reducing and modifying ash content of the feed source, and wherein the reducing and modifying ash content of the feed source results in an ash content within a range of about 1-4%;
- partially pyrolizing the feed source by heating the feed source to a temperature below the melting point of carbon in an oxygen free atmosphere to drive off moisture and volatiles, and to increase the surface area and the internal void volume of the feed source material;
- and
- collecting resulting carbon material as a metallurgical coal substitute product suitable for pulverized coal injection into a blast furnace.
3 more elements
A process to produce a metallurgical coal substitute from feed material for use in a pulverized coal injection (PCI) process for blast furnace production of iron from iron ore, comprising:
- selecting a non-metallurgical coal carbon containing feed source as a carbon base for the metallurgical coal substitute to be produced;
- pulverizing the feed source carbonaceous material;
- controlling ash content of the feed source by measurement and adjustment to a low ash content within a range of 1-8%;
- partially pyrolizing the feed source by heating the feed source to a temperature below the melting point of carbon in an oxygen free atmosphere to drive off moisture and volatiles, wherein adjusting reactivity of the feed source comprises altering reactivity by heating and wherein thermal conversion occurs between about 150-800° C., at a heating rate of about 10-200° C./min to increase the surface area and the internal void volume of the feed source material;
- and
- collecting resulting carbon material as a metallurgical coal substitute product suitable for pulverized coal injection into a blast furnace.
3 more elements
Dependencies are inferred from the claim text.