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Method for producing high-phosphorus iron by directly reducing high-phosphorus ore with shaft furnace
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A high-phosphorus rock and shaft furnace technology, applied in the field of metallurgy, can solve the problems of increasing costs and not being suitable for shaft furnaces, and achieve the effects of cost saving, energy saving, and simple process
Inactive Publication Date: 2016-08-24
武汉钢铁有限公司
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Problems solved by technology
However, it is not suitable for shaft furnace production, and the furnace needs to be rebuilt, which increases the cost
Method used
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Embodiment 1
[0018] A method for directly reducing high-phosphate ore with a shaft furnace, the steps comprising:
[0019] (1) Get 49 parts of high-phosphorus rock powder, 1 part of bentonite, 2.5 parts of coal powder, and the particle size of each component is less than or equal to 0.074 mm, accounting for more than 60%;
[0020] (2) Pour the raw materials on the pelletizing tray after batching, spray atomized water with a water content of 10%, and manually press them into pellets;
[0021] (3) Carry out the reduction reaction at 1000° C. for 4 hours in the fixed bed of the shaft furnace, and the reduction reaction uses CO and N 2 In the mixed gas atmosphere, CO accounts for 30% of the gas volume.
Embodiment 2
[0023] A method for directly reducing high-phosphate ore with a shaft furnace, the steps comprising:
[0024] (1) Get 49 parts of high-phosphate rock powder, 1 part of bentonite, 4.5 parts of coal powder, and the particle size of each component is less than or equal to 0.074 mm, accounting for more than 60%;
[0025] (2) Pour the raw materials on the pelletizing tray after batching, spray atomized water with a water content of 10%, and manually press them into pellets;
[0026] (3) Carry out the reduction reaction at 1000° C. for 3.5 hours in the fixed bed of the shaft furnace, and the reduction reaction uses CO and N 2 In the mixed gas atmosphere, CO accounts for 20% of the gas volume.
Embodiment 3
[0028] A method for directly reducing high-phosphate ore with a shaft furnace, the steps comprising:
[0029] (1) Get 49 parts of high-phosphate rock powder, 1 part of bentonite, and 5 parts of coal powder, and the particle size of each component is less than or equal to 0.074 mm, accounting for more than 60%;
[0030] (2) Pour the raw materials on the pelletizing tray after batching, spray atomized water with a water content of 10%, and manually press them into pellets;
[0031] (3) Carry out the reduction reaction at 1000° C. for 3.5 hours in the fixed bed of the shaft furnace, and the reduction reaction uses CO and N 2 In the mixed gas atmosphere, CO accounts for 25% of the gas volume.
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Abstract
The invention provides a method for manufacturing high-phosphorus iron by using a shaft furnace to directly reduce high phosphorus ore. The method comprises the following steps: (1) taking 49 parts of high phosphorus ore powder, 1 part of bentonite and 2.5-20 parts of coal dust by weight, wherein the components with the grain sizes not more than 0.074 mm account for 60% above; (2) pouring the mixture on a ball-making plate, spraying 10% atomized water and pressing the mixture into pellets; (3) performing reduction reaction in a fixed bed of the shaft furnace at 1000 DEG C, wherein the mixed gas atmosphere of CO and N2 is adopted in the reduction reaction and the volume ratio of the CO in the gas is 5-30%. As the high-phosphorus iron is directly manufactured by using a common shaft furnace, so that the cost is reduced greatly, the process is simple and the effect is good. Meanwhile, the reaction temperature is low, and energy conservation and very high practicability are achieved.
Description
technical field [0001] The invention belongs to the field of metallurgy, and specifically refers to a method for producing high-phosphorus iron by directly reducing high-phosphorus ore with a shaft furnace. Background technique [0002] With the rapid development of the iron and steel industry, my country has become the largest importer of iron ore. The iron and steel industry is facing the danger of shortage of raw material resources, which poses a great threat to the healthy development of my country's iron and steel industry. However, the high-phosphorus oolitic hematite in our country has not been developed and utilized. The mineral composition of high-phosphorus iron ore in my country is complex, the particle size of phosphorus minerals is small, the relationship between phosphorus minerals and iron minerals is close, and the connection force is strong. Most of the iron minerals are hematite, which is a refractory ore. . The high-phosphorus iron ore in western Hubei wa...
Claims
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Application Information
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