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Production of iron using environmentally-benign renewable or recycled reducing agent

A reducing agent, iron ore technology, applied in the field of iron ore smelting, can solve environmental problems, disadvantages and other problems

Active Publication Date: 2009-05-27
MICHIGAN TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, apart from being a limited non-renewable resource, coal burning also causes environmental problems by releasing heavy metals such as mercury into the environment and producing greenhouse gases that are widely considered to be harmful to the atmosphere

Method used

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  • Production of iron using environmentally-benign renewable or recycled reducing agent
  • Production of iron using environmentally-benign renewable or recycled reducing agent
  • Production of iron using environmentally-benign renewable or recycled reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Iron ore concentrate is mixed with ground wood, wherein the ore concentrate comprises magnetite (Fe 3 o 4 ), consisting of 90% particles passing through a 25 μm sieve, and containing 5% silica, the wood includes Wood chips, averaging about 1 inch in length, about 1 / 8 inch thick, and about 5% moisture, were supplied by Carbontec, Energy Corporation of Bismarck ND. The wood chips were dry ground in a rod mill and passed through a 4.75mm sieve. Because ground wood does not have enough cohesive force to form a cohesive mass, a small amount of wheat flour is added as a binder. The magnetite, ground wood, and wheat flour are weighed separately and blended together in a high-speed blender humidified to create a thin layer of moisture until the mixture begins to form clumps. The mixture was then formed into pellets containing about 25 g of fine iron ore and about 7.5 g of ground wood chips and wheat flour, resulting in a reducing agent weight of about 30% by weight of the m...

Embodiment 2

[0056] Produce metallic iron with magnetite ore in 4 experiments, its process is basically the same as embodiment 1, but heating temperature drops to 1425 ℃ and 1400 ℃. The feed mixture consisted of approximately 100 g magnetite, 30 g ground wood and 2 g wheat flour. The combined mixture was divided into 4 portions to form aggregates each containing 25g of magnetite, 7.5g of ground wood and 0.5g of wheat flour. When the heating time is at least 20 minutes, a good metallic iron product can be obtained.

Embodiment 3

[0058] In the third run, the feed mixture consisted of approximately 100 g magnetite, 20 g ground wood and 2 g wheat flour. The combined mixture was divided into 4 portions to form aggregates each containing 25g of magnetite, 5g of ground wood and 0.5g of wheat flour. Each pellet was then heated at a temperature ranging from 1375°C to 1425°C. After heating in the furnace, a fine metallic iron nugget product is obtained.

[0059] The results obtained for Examples 2 and 3 are listed in Table 1 below.

[0060] Table 1

[0061]

[0062] The column of "initial pellet weight" is the total weight of each pellet including magnetite reducing agent and binder. The estimated percent iron recovery is based on the weight of primary metallic iron produced and does not include the weight of the small metal beads contained in the slag. It was concluded that, under the furnace conditions employed, a minimum of 20 minutes was required to complete the reduction process and successfully se...

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Abstract

To produce metallic iron from iron ore, a composition comprising a mass of material formed from a mixture of iron ore particles and particles of a reductant that is either a biomass material in particulate form or a plastic resinous material in particulate form is used. The reductant can also be a mixture of biomass material and resin in any proportions. The mass of material comprises at least one body having a shape adapted for smelting such as pellets, briquettes, pieces or lumps. The pellets have sufficient cohesion to maintain the shape into which they have been formed. The invention also provides a new method for smelting iron from its ore which comprises subdividing the ore into particles of a selected size, mixing the subdivided ore particles with particles of a biomass material or particles of a plastic resinous material or with mixtures thereof, forming a mass of the mixture into at least one body with a shape that is suited for smelting in a furnace and placing the body in a furnace and exposing it to sufficient heat to bring the iron therein to smelting temperature within the furnace to thereby produce metallic iron directly from the ore.

Description

[0001] related application [0002] This patent application claims priority to US Provisional Patent Application No. 60 / 781,796, filed March 13, 2006, having the same title, the disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to smelting iron ore, and more particularly to compositions and methods for producing metallic iron from iron ore. Background of the invention [0004] Since ancient times, iron has been extracted from iron ore by using fuels containing free carbon such as coal or charcoal to generate heat and reduce the gas required for iron ore reduction. Wood itself produces very little heat, about 6,000-8,000 BTU / lb, compared to coal (12,000-15,000 BTU / lb) and coke (about 12,000-15,000 BTU / lb). The temperature of the small furnaces and simple blowing equipment used in the early days was not high enough to form iron carbide, so the iron formed in this way was not of high use value at first, and the iron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/244C22B11/00
Inventor T·C·艾瑟勒S·K·卡瓦特拉
Owner MICHIGAN TECHNOLOGICAL UNIVERSITY
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