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Method for smelting qualified pig iron from low-grade dilution ores containing high quantities of harmful elements

A technology with harmful elements and low grades, applied in blast furnace smelting and smelting fields, can solve the problems of high coke usage ratio, high resource dependence, high harmful elements, etc., achieve pig iron smelting cost reduction, improve technical and economic indicators, and keep output unchanged Effect

Active Publication Date: 2013-07-17
WUKUN STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw materials used in blast furnaces generally have a single source, strong stability, and high resource dependence, and do not reflect the characteristics of high harmful elements and a high proportion of coke with a fixed carbon content of 80%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A. Send the ore with the following mass ratio and coke containing 83% fixed carbon into the blast furnace according to the conventional amount:

[0022] Diluted sinter 70%

[0023] Diluted pellets 5%

[0024] Conventional pellets 20%

[0025] lump ore 5%;

[0026] The depleted sinter is formed by conventional sintering with a mass ratio of 80% low-grade depleted ore and 20% ordinary ore, and its chemical composition is: sinter: TFe 47%, SiO 2 9.8%, CaO 18.5%, MgO 3.5%, TiO 2 2 O+Na 2 O) 0.500%;

[0027] The depleted pellets are made by conventional methods with a mass ratio of 80% low-grade depleted ore and 20% ordinary ore, and its chemical composition is: TFe 54.5%, SiO 2 13.0%, S 0.130%, (Pb + Zn) 0.08%, (K 2 O+ Na 2 O) 0.750%;

[0028] The coke composition is: C 83.0%, Ash 14.5%, CRI60.0;

[0029] B. Smelting under the following conditions: the air inlet area of ​​the tuyere is 0.2350m 3 , the hot air pressure is 0.33MPa, the hot air temperature is...

Embodiment 2

[0034] A. Send the ore with the following mass ratio and coke containing 80% fixed carbon into the blast furnace according to the conventional amount:

[0035] Diluted sinter 65%

[0036] Diluted pellets 15%

[0037] Conventional pellets 20%;

[0038] The depleted sinter is formed by conventional sintering with a mass ratio of 70% low-grade depleted ore and 30% ordinary ore, and its chemical composition is: sinter: TFe 42%, SiO 2 8.0%, CaO 14.5%, MgO 3.35%, TiO2 2 O+Na 2 O) 0.300%;

[0039] The depleted pellets are made by conventional methods with a mass ratio of 70% low-grade depleted ore and 30% ordinary ore, and its chemical composition is: TFe 52.5%, SiO 2 11.5%, S0.110%, (Pb + Zn) 0.05%, (K 2 O+ Na 2 O) 0.550%;

[0040] The coke composition is: C 80.0%, Ash 18.5%, CRI60.0;

[0041] B. Smelting under the following conditions: the air inlet area of ​​the tuyere is 0.1350m 3 , the pressure of the hot air is 0.23MPa, the temperature of the hot air is 1050°C, ...

Embodiment 3

[0046] A. Send the ore with the following mass ratio and coke containing 83% fixed carbon into the blast furnace according to the conventional amount:

[0047] Diluted sinter 65%

[0048] Diluted pellets 10%

[0049] Conventional pellets 20%

[0050] lump ore 5%;

[0051] The depleted sinter is formed by conventional sintering with a mass ratio of 75% low-grade depleted ore and 25% ordinary ore, and its chemical composition is: sinter: TFe 45%, SiO 2 8.8%, CaO 16.5%, MgO 3.4%, TiO 2 2 O+Na 2 O) 0.400%;

[0052] The depleted pellets are made by conventional methods with a mass ratio of 75% low-grade depleted ore and 25% ordinary ore, and its chemical composition is: TFe 53.5%, SiO 2 12.5%, S0.120%, (Pb + Zn) 0.06%, (K 2 O+ Na 2 O) 0.65%;

[0053] The coke composition is: C 83.0%, Ash 14.5%, CRI60.0;

[0054] B. Smelting under the following conditions: hot air pressure 0.33MPa, hot air temperature 1150°C, furnace air volume 3200m 3 / min, the oxygen content is 3...

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Abstract

The invention provides a method for manufacturing qualified pig iron from low-grade dilution ores containing high quantities of harmful elements. The method includes feeding, by mass, 60-75% of dilution sintering ores, 10-15% of dilution pellet ores, 10-20% of conventional pellet ores, 0-7% of lump ores and coke containing 80% of fixed carbon into a blast furnace according to conventional quantities; and smelting the ores and the coke to obtain the low-cost qualified pig iron. The sum of the mass proportions of the dilution sintering ores, the dilution pellet ores, the conventional pellet ores and the lump ores is 100%. The method has the advantages that certain smelting intensity is kept under the condition of the blast furnace, the blast furnace can stably and smoothly run for long cycles, the content of silicon is stably controlled, the yield keeps unchanged, the fuel ratio is stable, and local low-grade ore resources are sufficiently utilized.

Description

technical field [0001] The invention relates to a smelting method, especially a method for producing qualified low-cost pig iron by using low-grade depleted ore containing high harmful elements as ore raw material and a certain proportion of low-quality coke with a fixed carbon content of 80% as reducing agent. The method belongs to the technical field of blast furnace smelting. Background technique [0002] In the production process of iron and steel complexes, the cost of pig iron smelting accounts for 70-75% of the total cost per ton of material. With the shortage of domestic ore, the price of imported ore and the increase in transportation costs, most of the profits of iron and steel enterprises are lost to overseas mines and transport units. occupy. Reducing the cost of ironmaking is crucial to enhancing the market competitiveness of iron and steel enterprises. The systematic research and development utilizes the dilute sinter and dilute pellets formed by the sinteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00C22B1/16C22B1/24
Inventor 唐德元李明丁跃华林安川姬连平杨康钟伟陈元富杨凯罗桂玲普松张涛赵树逵彭卫东朱兰云
Owner WUKUN STEEL
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