Shortened production equipment and method of coal-based direct reduced iron
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A direct, equipment technology, applied in the metallurgical field, which can solve the problems of high cost, inability to meet the demand for reduced iron, and low output
Active Publication Date: 2012-10-31
辽宁博联特冶金科技有限公司
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Problems solved by technology
Due to high cost and low output, the annual output of a single production line is only 30,000 to 50,000 tons, which cannot meet the demand for reduced iron in the industrial production of large iron and steel enterprises
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Embodiment 1
[0049] Laboratory restoration:
[0050] Put 200g of the above-mentioned oxidized pellets into the crucible, place the crucible in a muffle furnace and raise the temperature to 1150°C, which is basically the same as the temperature of the oxidized pellets discharged from the rotary kiln;
[0051] Make reductant, used bituminous coal index as shown in table 3, used lime as shown in table 4;
[0052] Prepare reducing agent, by weight percentage,
[0053] Bituminous coal: lime powder = 88:12, that is, bituminous coal accounts for 88% of the total weight of the reducing agent, and lime accounts for 12% of the total weight
[0054] Table 3 Bituminous coal index (composition by weight percentage)
[0055] Ash
Volatile matter
fixed carbon
Sulfur content
Moisture
Granularity
13.00
28.00
57.00
0.45
1.55
0~6mm
[0056] Table 4 Lime index (composition by weight percentage)
[0057] CaO
Sulfur content...
Embodiment 2
[0064] Small Industrial Trials:
[0065] Get 5000g of the above-mentioned oxidized pellets, the reducing agent proportion and index are exactly the same as those in Example 1.
[0066] Self-made a volume of 0.1m 3 A sealed thermal insulation cone container is inlaid with thermal insulation bricks, and electric furnace wires are connected in series in the thermal insulation bricks. Heat the insulation cone container to 1000°C first, and set it aside.
[0067] Heat the oxidized pellets to 1120°C, quickly mix them evenly with the cold reducing agent, immediately put them into a conical container at 1050°C, cover the lid, heat to 1020°C with electricity, and keep warm for 7 hours; then cool down to 900°C, keep warm for 4 hours ; then lower the temperature to 850°C and keep it warm for 4 hours; stop power transmission and cool down naturally. When the temperature drops to 300°C to 400°C, pour out the material and bury it in cold coal for 40 minutes. Use a magnet to suck out the m...
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Abstract
The invention discloses shortened production equipment and a method of coal-based direct reduced iron. The equipment comprises production equipment used for preparing an oxidized pellet by a grate rotary kiln and is characterized in that the diameter of a kiln head of a rotary kiln is increased by 30-35%; a reducing agent using coal as base is jetted into the rotary kiln by using a spray gun; the reducing agent and the oxidized pellet are sufficiently mixed, and enter two reducing furnaces, which are approximately shaft furnaces, through a sealed tank and conveying equipment in sequence to be reduced in the reducing furnaces for 15-18 hours, so that a metalized pellet is manufactured; and the production equipment is also provided with a coal gas recycling system, a cooling device before the oxidized pellet is discharged out of the furnaces, and the like. Through the adoption of the equipment disclosed by the invention, the iron direct reducing process is obviously shortened; and as the coal is mainly used in the reducing agent and coal gas generated in the production can be recycled, the domestic coal resource superiority is brought into full play and energy can be also be greatly saved.
Description
technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for directly reducing iron oxides after roasting by using coal as a reducing agent. Background technique [0002] Non-blast furnace ironmaking technology is one of the cutting-edge technologies in the development of the iron and steel industry. Among them, the production of direct reduction iron metal has become an indispensable part of the world's iron and steel industry. The development of direct reduction iron production to make up for the shortage of steel scrap is an urgent need in the development of my country's iron and steel industry. One of the problems solved. Although China is the world's largest steel producer, with steel output exceeding 700 million tons in 2011, the annual output of direct reduced iron has been hovering at 400,000 to 500,000 tons, less than 1% of the world's total output of reduced iron, and There are also technological chall...
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