Melting method for dephosphorization under reducing atmosphere for high phosphate ore

A high-phosphate rock and dephosphorization technology, which is applied in the field of ironmaking, can solve the problems of complex reaction devices and charging methods, and achieve the effects of simple charging methods, reduced energy consumption, and reduced energy consumption

Inactive Publication Date: 2007-12-26
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The Hi-QIP ironmaking method effectively utilizes carbonaceous materials, improves thermal efficiency, and reduces the emission of carbon dioxide gas, but its reaction device and charging method are complicated, and the product is granular iron
[0008] So far, there are no reports of these smelting reduction processes for smelting high-phosphorus ores with a phosphorus content exceeding 0.2%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The present invention is a melting reduction dephosphorization method of high phosphorus ore. After mixing high phosphorus ore, carbonaceous reducing agent, quicklime and fluorite into the temperature field, the temperature rises rapidly. Because the iron ore powder is in good contact with carbon , the reaction speed is very fast, and at the same time, the gas generated by gasification and reduction of carbon at high temperature participates in the reduction again, so that the reaction kinetics conditions are more sufficient, and the reaction speed is further accelerated. The initial reduction product is FeO, which can effectively prevent the reduction of phosphorus. The oxidized phosphorus is fixed, and the full contact of the mixed charge is very beneficial to the dephosphorization reaction. Reduced pig iron and slag gradually gather. When the charge is not completely melted, the temperature is low, the alkalinity is high, silicon is rarely reduced, and the oxygen pote...

Embodiment 2

[0025] The difference between this example and Example 1 is that the carbonaceous reducing agent is calculated according to the iron grade of high-phosphate ore, the ratio range of carbon to iron is 141kg / tFe-176kg / tFe, and the quicklime is calculated according to the SiO in high-phosphate ore. 2 Calculation of content, CaO / SiO 2 The range is 1.6-1.72. The fluorite is calculated by the weight of high-phosphate rock, and the weight ratio of fluorite to phosphor rock is in the range of 16%-20%. The temperature of the temperature field is 1301°C-1353°C.

Embodiment 3

[0027] The difference between this example and Example 1 is that the carbonaceous reducing agent is calculated according to the iron grade of high-phosphate ore, the ratio range of carbon to iron is 177kg / tFe-212kg / tFe, and the quicklime is calculated according to the SiO in high-phosphate ore. 2 Calculation of content, CaO / SiO 2 The range is 1.73-1.80, and the fluorite is calculated by the weight of high-phosphate rock, and the weight ratio of fluorite to phosphor rock ranges from 13% to 16%. The temperature of the temperature field is 1354°C-1427°C.

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Abstract

This invention discloses a method for dephosphorization of high-phosphorus ore by melt reduction. The high-phosphorus ore smelting capacity of the present melt reduction process depends on the oxygen potential of furnace slag, and is very low generally. The method in this invention comprises: mixing high-phosphorus ore, carbon reductant, quicklime and fluorite, adding into a temperature field, and melting. The ratio of carbon in carbon reductant to iron in high-phosphorus ore is 140-350 kg C / ton Fe. The ratio of CaO in quicklime to SiO2 in high-phosphorus ore is 1.6-3.0. The weight ratio of fluorite to high-phosphorus ore is 5-20%. The diameters of high-phosphorus ore are below 6 mm. The diameters of carbon reductant are below 0.5 mm. The diameters of quicklime and fluorite are below 6 mm. The temperature of the temperature field is 1300-1500 deg.C.

Description

technical field [0001] The invention relates to a method for smelting reduction dephosphorization of high-phosphorus ore, which belongs to the technical field of ironmaking. technical background [0002] As the main body of modern ironmaking methods, blast furnace has developed its theory and technology to its peak, and its technical and economic indicators have reached a very high level. However, because it requires high-quality charge and coke, it cannot directly use cheap iron ore and carbon-containing raw materials, especially ores with high phosphorus content. In the blast furnace, all phosphorus is reduced into pig iron, so the phosphorus in iron ore is It must be controlled to a fairly low level before entering the blast furnace. [0003] However, phosphorus in high-phosphate ore, especially oolitic high-phosphorus hematite, is extremely difficult to remove during the beneficiation process, and smelting reduction can relax the requirements for raw materials, which is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/00
Inventor 岑明进文志军吴杰
Owner 武钢集团有限公司
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