Dephosphorization and iron-increasing method of high phosphorus hematite by direct reduction

A technology of hematite and hematite powder, which is applied in the field of direct reduction, dephosphorization and iron extraction of high phosphorus hematite, can solve the problems of low recovery rate, high cost of chemical methods, erosion of furnace lining, etc., and achieve dephosphorization rate and iron The yield is high, the residue can be recycled, and the effect of improving the dephosphorization ability

A technology of hematite and hematite powder, which is applied in the field of direct reduction, dephosphorization and iron extraction of high phosphorus hematite, can solve the problems of low recovery rate, high cost of chemical methods, erosion of furnace lining, etc., and achieve dephosphorization rate and iron The yield is high, the residue can be recycled, and the effect of improving the dephosphorization ability

CN101984079BInactive Publication Date: 2012-05-23WUHAN UNIV OF SCI & TECH
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  • Dephosphorization and iron-increasing method of high phosphorus hematite by direct reduction
  • Dephosphorization and iron-increasing method of high phosphorus hematite by direct reduction
  • Dephosphorization and iron-increasing method of high phosphorus hematite by direct reduction

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Embodiment 1

[0019] The invention discloses a method for directly reducing high-phosphorus hematite to dephosphorize and improve iron. First mix 60-70wt% high-phosphorus hematite powder, 13-15wt% carbonaceous reducing agent, 12-15wt% quicklime and 5-10wt% additives, press into agglomerates, dry, and then Reduction in the furnace at 1250-1300°C, heat preservation for 15-30 minutes; cooling down to 600-800°C with the furnace, taking out the reduced products, cooling naturally, grinding, and magnetic separation to obtain pig iron particles.

[0020] The additive in this embodiment is sodium carbonate, the high-temperature furnace is a resistance furnace, and the atmosphere in the furnace is adjusted to be a neutral atmosphere.

[0021] In this embodiment, the reduction time is short, the process is simple, the environmental pollution is small, the residue can be recycled, the dephosphorization efficiency is 82% to 90%, the carbon content in iron is 3.5% to 3.8%, and the iron yield is 85% to 9...

Embodiment 2

[0023] The invention discloses a method for directly reducing high-phosphorus hematite to dephosphorize and improve iron.

[0024] The additive in this embodiment is potassium carbonate, the high-temperature furnace is a rotary hearth furnace, and the atmosphere in the furnace is adjusted to be a neutral atmosphere. All the other are with embodiment 1.

[0025] In this embodiment, the reduction time is short, the process is simple, the environmental pollution is small, the residue can be recycled, the dephosphorization efficiency is 79% to 87%, the carbon content in iron is 3.7% to 3.9%, and the iron yield is 83% to 89%. .

Embodiment 3

[0027] The invention discloses a method for directly reducing high-phosphorus hematite to dephosphorize and improve iron.

[0028] The additive in this embodiment is a mixture of sodium carbonate and potassium carbonate, the high-temperature furnace is a rotary kiln, and the atmosphere in the furnace is adjusted to be a weakly reducing atmosphere. All the other are with embodiment 1.

[0029] In this embodiment, the reduction time is short, the process is simple, the environmental pollution is small, the residue can be recycled, the dephosphorization efficiency is 82% to 91%, the carbon content in iron is 3.6% to 4.1%, and the iron yield is 87% to 91%. .

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Abstract

The invention particularly relates to a dephosphorization and iron-increasing method of high phosphorus hematite by direct reduction, and the technical scheme comprises the following steps: mixing 60-83wt% of high phosphorus hematite powder, 10-15wt% of carbonaceous reducing agent, 6-15wt% of quicklime and 1-10wt% of additive uniformly, pressing the mixture into blocks, drying, reducing in a hightemperature furnace under 1250-1350 DEG C, and keeping the temperature for 15-30 minutes; carrying out furnace cooling until the temperature is 600-800 DEG C, taking the reduction product out, naturally cooling, grinding and performing the magnetic separation to obtain pig iron particles. The additive is sodium carbonate, or potassium carbonate, or the mixture of the sodium carbonate and the potassium carbonate; drying is carried out under the condition of 110-120 DEG C until the weight of the mixture of raw materials is constant; and the high temperature furnace is a resistance furnace, or arotary kiln, or a rotary hearth furnace, and the atmosphere in the high temperature furnace is neutral or weak-reductive. The invention has the advantages of short reduction time, simple process, high dephosphorization rate, high iron yield, less environmental pollution, recyclable residue and the like.

Description

technical field [0001] The invention belongs to the technical field of iron ore dephosphorization, and in particular relates to a method for directly reducing and dephosphorizing high-phosphorus hematite to increase iron. Background technique [0002] With the rapid development of my country's iron and steel industry, the demand for iron ore is increasing. However, the substantial increase in the price of imported iron ore has caused my country's iron and steel industry to face enormous pressure on resources. However, the impurity content of domestic iron ore is relatively high, so that many iron ores cannot directly enter the smelting process, especially in Hubei, Hunan, Yunnan and other places in my country, there are a large number of high-phosphorus iron ore. Generally speaking, the phosphorus in iron ore cannot be removed to a qualified level by conventional beneficiation methods, and the cost is extremely high, which will lead to the fact that my country's high-phosph...

Claims

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Application Information

Patent Timeline
23 May 2012
Publication
CN101984079B
IPC
C21B13/00; C22B1/14
CPC
Y02P10/20
Inventors
李光强; 李永军