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Bell type blast furnace smelting method by using small-size sinters

A technology for small-sized sintered ore and bell-type blast furnace, which is applied in the field of ore smelting, can solve the problems of complicated charging, distribution and air supply operations, and achieves the effects of reducing processing costs, improving economic benefits and ensuring normal production.

Active Publication Date: 2014-05-28
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the bell-less blast furnace uses small-sized sinter, the operation of charging, distributing and blowing air is complicated.
[0005] In addition, there are many domestic and foreign documents and patents on the use of small-sized sinters for grading into bellless blast furnaces, but none of them are bell-type blast furnaces.

Method used

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  • Bell type blast furnace smelting method by using small-size sinters
  • Bell type blast furnace smelting method by using small-size sinters
  • Bell type blast furnace smelting method by using small-size sinters

Examples

Experimental program
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Effect test

Embodiment 1

[0054] at 1200m 3 The bell-type blast furnace smelting vanadium-titanium magnetite is taken as an example to illustrate the method of using small-sized sinters for bell-type blast furnace smelting.

[0055] Preparation of small-sized sintered ore: the sintered ore stored in the ore storage tank 16.1 under the trestle bridge is screened by the sintering vibrating screen 11 under the ditch, and the sintered ore with a particle size of >5mm falls on the main feeding belt 18 under the ditch and enters the feeding In the trolley 4; the sintered ore (returned ore) with a particle size of 3mm is screened out from the returned ore, and stored in the ore tank 14, and then new belt conveyors 15.1, 15.2, 15.3, etc. are built or the small grained sintered ore >3mm is transferred to an independent mine under the ditch by using the blast furnace trestle belt Tank 16.4 is stored for use in the blast furnace; the returned ore of the undersize <3mm passes through a small belt or a drain (not s...

Embodiment 2

[0064] The process flow is the same as in Example 1, and the process parameters and smelting effects are shown in Table 1.

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PUM

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Abstract

The invention discloses a bell type blast furnace smelting method by using small-size sinters. The method comprises the steps as follows: loading, that is, ore and coke both containing the small-size sinters are added into a bell type blast furnace; blowing, specifically, air blast kinetic energy is controlled to be 150-230kJ / s, the air blast temperature is not lower than 1,180 DEG C, and the air blast oxygen enrichment percentage is not lower than 1 percent; wherein, the small-size sinter comprises the following components by weight percentage: 45-55 percent of sinter which is 3-5 mm in particle size, 35-45 percent of sinter with particle size greater than 5 mm and 0-20 percent of sinter with particle size smaller than 3 mm. According to the bell type blast furnace smelting method by using small-sized sinter, disclosed by the invention, the defect that the small-size sinter cannot be used by a bell type blast furnace for smelting is overcome, and by regulating process parameters, the normal production is ensured and the economic benefit is improved. Moreover, the processing cost of sorting the grades of the singers is reduced by recovering the small-sized sinters in returned ore into the blast furnace for smelting. Furthermore, by adopting the small-size sinters, the state of the material shortage of blast furnace is eliminated, and the cost of raw materials is lowered.

Description

technical field [0001] The invention belongs to the technical field of ore smelting, and in particular relates to a method for smelting in a bell blast furnace using small-sized sintered ore. Background technique [0002] Small-sized sinter refers to sinter with a particle size greater than 3mm in the blast furnace sinter undersieve, and it occupies a large proportion of blast furnace return ore. Usually, the sintered ore with particle size > 5mm can be smelted directly as a finished product. However, due to problems such as finished sieve, under-ditch sieve specifications, and sieving efficiency, it is impossible for the returned ore to be completely sintered ore with a particle size of <5mm. Small-sized sintered ore with a particle size of 3-5mm. [0003] The recycling of small-sized sinter can not only alleviate the "bottleneck" of sinter supply, but also avoid energy waste, which in turn saves a lot of operating costs for enterprises. Through the tracking and an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
Inventor 蒋大均杜斯宏宋剑周章金吴亚明张远祥何木光曾华锋张志刚张海军
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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