A method for dephosphorizing iron ore and raising iron

A high-phosphorus iron ore and dephosphorization technology, applied in the field of smelting, can solve the problems of long processing process, achieve short process, good dephosphorization effect, and solve the effect of ore resource shortage

Active Publication Date: 2018-07-10
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the deep reduction-high-efficiency sorting method has a long process

Method used

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  • A method for dephosphorizing iron ore and raising iron

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] CaCl 2 The saturated aqueous solution was sprayed on the reduced coal (C: 78.1wt%) at a ratio of 100ml / 100g, dried at 105°C, and then finely ground to below 200 mesh to obtain modified reduced coal powder.

[0040] NaCO 3 Saturated aqueous solution is sprayed on high-phosphorite (TFe: 51.2wt%, P: 0.85wt%), the ratio is 6ml / 100g, dried at 130°C, and then finely ground to below 200 mesh to obtain modified high-phosphorite pink.

[0041] Mix the modified reduced coal powder and modified high-phosphorus iron ore powder according to C / O=1.2, add 5% CaF of the high-phosphorus iron ore powder mass 2 After mixing, pellets were made and dried; the dried pellets were calcined at 1400° C. for 40 minutes and air-cooled to obtain pearl iron (P: 0.18wt%) and slag.

Embodiment 2

[0043] CaCl 2 The saturated aqueous solution is sprayed on the reduced coal (C: 80.3wt%) at a ratio of 150ml / 100g, dried at 100°C, and then finely ground to below 200 mesh to obtain modified reduced coal powder.

[0044] NaCO 3 Saturated aqueous solution is sprayed on high-phosphorite (TFe: 53.6wt%, P: 0.92wt%), the ratio is 8ml / 100g, dried at 110°C, and then finely ground to below 200 mesh to obtain modified high-phosphorite pink.

[0045] Mix the modified reduced coal powder and modified high-phosphorus iron ore powder according to C / O=1.5, and add 10% CaF 2 After mixing, pellets were made and dried; the dried pellets were calcined at 1420° C. for 30 minutes and air-cooled to obtain pearl iron (P: 0.21 wt %) and slag.

Embodiment 3

[0047] CaCl 2 The saturated aqueous solution is sprayed on the reduced coal (C: 80.5wt%) at a ratio of 200ml / 100g, dried at 110°C, and then finely ground to below 200 mesh to obtain modified reduced coal powder.

[0048] NaCO 3Saturated aqueous solution is sprayed on high-phosphorite (TFe: 54.2wt%, P: 0.95wt%), the ratio is 7ml / 100g, dried at 120°C, and then finely ground to below 200 mesh to obtain modified high-phosphorite pink.

[0049] Mix the modified reduced coal powder and modified high-phosphorus iron ore powder according to C / O=1.8, and add 8% of the mass of high-phosphate iron ore powder CaF 2 After mixing, pellets were made and dried; the dried pellets were calcined at 1450° C. for 60 minutes and air-cooled to obtain pearl iron (P: 0.28 wt %) and slag.

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Abstract

The invention discloses a dephosphorization iron-increasing method for high-phosphorus iron ore. The method comprises the following steps that 1, reduction coal is treated to be modified reduction coal powder, wherein a CaCl2 saturate water solution is sprayed to the surface of the reduction coal, the reduction coal is dried and ground, and the modified reduction coal powder is obtained; 2, high-phosphorous iron ore is treated to be modified high-phosphorous iron ore powder, wherein a NaCO3 saturate water solution is sprayed to the surface of the high-phosphorous iron ore, the high-phosphorous iron ore is dried and ground, and modified high-phosphorous iron ore powder is obtained; 3, the modified reduction coal powder and the modified high-phosphorous iron ore powder are mixed to be uniform to be prepared into pellets and dried; 4, the dried pellets are cooled after being roasted to obtain iron beads. The dephosphorization iron-increasing method for the high-phosphorus iron ore has the advantages of being short in flow and good in dephosphorization effect, and is of great significance in effectively improving high-phosphorus iron ore and solving the problem of lack of ore resources.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a method for dephosphorizing and raising iron from high-phosphorus iron ore. Background technique [0002] my country has rich reserves of high-phosphorus iron ore, with reserves reaching 7.4 billion tons, mainly distributed in Sichuan, Hubei, Yunnan, Hunan and other places. The iron grade of this kind of high phosphorus iron ore can exceed 50%, and the phosphorus content is also very high. Due to the complex composition of ferrophosphorite, the grains of iron oxides are very fine and closely embedded with gangue. The selectivity is poor, it is difficult to enter the blast furnace for smelting, and it is rarely used. Therefore, it is of great significance to develop a smelting technology suitable for high-phosphorus iron ore. [0003] At present, flotation, leaching, and microbial methods are mostly used to treat such ores. [0004] Flotation is a widely used min...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B5/10
CPCC22B1/02C22B5/10
Inventor 徐刚任中山闫方兴曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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