Method for rapidly reducing and roasting as well as synchronously dephosphorizing and extracting iron at high temperature of high-silicon high-phosphorus iron ore

A high-temperature, fast, high-silicon technology, applied in the field of metallurgy, can solve the problems of low cold bending performance and plasticity, high cost of beneficiation methods, low recovery rate, etc.

Active Publication Date: 2009-11-04
湖南建湘高科新技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] ③ Reduce the welding performance, cold bending performance and plasticity of steel
The beneficiation method has high cost, low recovery rate, and low dephosphorization rate; the chemical method has the problem of wastewater treatment, and the cost is high; the smelting method is mainly slagging in the blast furnace, and the cost is high

Method used

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  • Method for rapidly reducing and roasting as well as synchronously dephosphorizing and extracting iron at high temperature of high-silicon high-phosphorus iron ore

Examples

Experimental program
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Effect test

Embodiment

[0027] The composition of the dephosphorization agent is slaked lime, hydrogenated rosin, and the reducing agent is ordinary lignite.

[0028] The production process steps are as follows:

[0029] 1. Crush high-phosphorus and high-silicon iron ore and lignite to -150 mesh, and crush slaked lime and hydrogenated rosin to 200 mesh.

[0030] 2. Ingredients: 70% of iron ore, 21.7% of slaked lime, 8% of lignite and 0.3% of hydrogenated rosin are mixed evenly by weight percentage.

[0031] 3. The evenly stirred mixture is input to the disc granulator for granulation and dried.

[0032] 4. Evenly put the dried mixed particles into the rotary kiln from the kiln tail, and use high-pressure pulverized coal and gas to raise the temperature of the kiln head (the high-efficiency energy-saving gas generator and pulverized coal heating device are used, both of which belong to the existing technology), and the temperature is controlled at 1100 -1200°C, stay in the kiln for 2 hours, and the ...

Embodiment 2

[0042] 1. Crush high-phosphorus and high-silicon iron ore and lignite to -150 mesh, and crush slaked lime and hydrogenated rosin to 200 mesh.

[0043] 2. Ingredients: 69.2% of iron ore, 25% of slaked lime, 12% of lignite and 0.1% of hydrogenated rosin are mixed evenly by weight percentage.

[0044] The following production process steps are the same as in Example 1.

Embodiment 3

[0046] 1. Crush high phosphorus and high silicon iron ore and lignite to -150 mesh, and crush slaked lime to 200 mesh.

[0047] 2. Ingredients: 70% iron ore, 20% slaked lime, and 10% lignite are mixed uniformly by weight.

[0048] The following production process steps are the same as in Example 1.

[0049] The above-mentioned rotary kiln is a cylindrical high-temperature reactor placed on several pairs of support wheels with a slight tilt. During operation, the kiln body rotates at a certain speed, and the iron-containing raw materials and reduced coal (part or all) are continuously added from the feeding end of the kiln tail. With the rotation of the kiln body, the solid materials continue to roll and move to the discharge end of the kiln head. The discharge end is equipped with a main fuel burner and a recovery coal injection device to provide part of the heat and reducing agent required by the process. The volatile matter released by burning coal in the kiln, the CO prod...

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Abstract

The invention relates to a method for rapidly reducing and roasting as well as synchronously dephosphorizing and extracting iron at high temperature of high-silicon high-phosphorus iron ore, which is characterized in that first, the high-silicon high-phosphorus iron ore, reducing agent and dephosphorizing agent are crushed to be 150mm, wherein, the reducing agent is common brown coal accounting for 8-12% of the total weight, the dephosphorizing agent is white lime accounting for 20-25% of the total weight, and the iron ore, the reducing agent and the dephosphorizing agent are evenly mixed together to be pelletized and dried, and then is reduced and roasted in a rotary kiln; coal dust and coal gas are sprayed into a head of the kiln to lead the temperature to raise to 1100-1200 DEG C, and the time used for reducing and roasting is 2-2.5hours; after reducing and roasting, the product is crushed and processed by two-section ball milling and three-section magnetic separation, so that low-silicon low-phosphorus iron-rich refined powder can be obtained. The method has the advantages of short reduction time, low energy consumption, large treatment capacity and production scale, environmental protection as well as having dephosphorizing rate of 80%, iron recovery rate of 70%, low cost and the like compared with a mineral dressing dephosphorizing method, a chemical dephosphorizing method, other smelting dephosphorizing methods and a microbial dephosphorizing method.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for high-phosphorus and high-silicon iron ore rotary kiln high-temperature rapid reduction roasting synchronous dephosphorization and iron extraction. Background technique [0002] In recent years, my country's iron and steel industry continues to grow at a high speed, and the demand for iron ore is increasing. With the continuous rise of international iron ore prices, the utilization of domestic low-grade high-phosphorus and high-silicon iron ores has been paid more and more attention. In addition, my country's iron ore reserves are characterized by more lean ore and less rich ore, and low-grade high-phosphorus iron ore reserves are large and concentrated, which is suitable for mining and has high development and utilization value. For this low-grade high-phosphorus iron ore produced by rotary kiln reduction roasting and synchronous dephosphorization magnetic separati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B5/08
Inventor 陈建湘
Owner 湖南建湘高科新技术开发有限公司
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