Methods for preparing and using pre-reduced fluxed pellets by taking steel slag as part of raw materials

A technology of flux and steel slag, which is applied in the field of pre-reduction flux pellet preparation, can solve the problems of failing to realize the reasonable application of secondary product dedusting ash and not mentioning steel slag, so as to enhance market competitiveness and realize green manufacturing , The effect of reducing the cost of blast furnace production

Inactive Publication Date: 2020-11-10
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such literature does not mention how to apply the steel slag produced by the iron and steel plant to the production of flux pellets, nor can it realize the reasonable application of the dust removal dust of the secondary product of the iron and steel plant

Method used

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  • Methods for preparing and using pre-reduced fluxed pellets by taking steel slag as part of raw materials
  • Methods for preparing and using pre-reduced fluxed pellets by taking steel slag as part of raw materials
  • Methods for preparing and using pre-reduced fluxed pellets by taking steel slag as part of raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Dust removal ash mixture ratio and processing plan

[0040] See Table 1 for the dedusting ash mixture ratio plan.

[0041] Table 1: Proportioning scheme of dust removal ash mixture

[0042] raw material name Proportion of mass mixing,% Blast furnace gravity ash25 Dry dust removal20 Gas mud25 Steelmaking Dust30

[0043] See Table 2 for the processing plan of dust removal ash mixture.

[0044] Table 2: Proportioning scheme of dust removal ash mixture

[0045] project Value Drying temperature, ℃200 Drying time, h5 Grinding time, min40 Mixing time, min35 Mixing particle size (less than 0.074mm accounting for the proportion of mass),%85

[0046] Pre-reduction flux pelletizing plan

[0047] See Table 3 for the pre-reduction flux pelletizing plan.

[0048] Table 3: Pre-reduction flux pelletizing plan

[0049] project Value Steel slag grain size range, mm 2~4 Grinding time, min40 Granularity of steel slag powder (in 0.074mm in mass proportion),%85 Dust removal ash ...

Embodiment 2

[0065] Dust removal ash mixture ratio and processing plan

[0066] See Table 7 for the ratio of dust removal ash mixture.

[0067] Table 7: Proportioning scheme of dust removal ash mixture

[0068] raw material name Proportion of mass mixing,% Blast furnace gravity ash30 Dry dust removal30 Gas mud10 Steelmaking Dust30

[0069] See Table 8 for the processing plan of dust removal ash mixture.

[0070] Table 8: Proportion plan of dust removal ash mixture

[0071] project Value Drying temperature, ℃250 Drying time, h6 Grinding time, min40 Mixing time, min40 Mixing particle size (less than 0.074mm accounting for the proportion of mass),%88

[0072] Pre-reduction flux pelletizing plan

[0073] See Table 9 for the pelletizing plan of pre-reduced flux pellets.

[0074] Table 9: Pre-reduction flux pelletizing plan

[0075] project Value Steel slag grain size range, mm 2~4 Grinding time, min40 Granularity of steel slag powder (in 0.074mm in mass proportion),%86 Dust removal...

Embodiment 3

[0090] Dust removal ash mixture ratio and processing plan

[0091] See Table 13 for the dedusting ash mixture ratio plan.

[0092] Table 13: Proportion plan of dust removal ash mixture

[0093] raw material name Proportion of mass mixing,% Blast furnace gravity ash30 Dry dust removal35 Gas mud15 Steelmaking Dust20

[0094] See Table 14 for the processing plan of dust removal ash mixture.

[0095] Table 14: Proportion plan of dust removal ash mixture

[0096] project Value Drying temperature, ℃300 Drying time, h7 Grinding time, min35 Mixing time, min35 Mixing particle size (less than 0.074mm accounting for the proportion of mass),%88

[0097] Pre-reduction flux pelletizing plan

[0098] See Table 15 for the pelletizing plan of pre-reduced flux pellets.

[0099] Table 15: Pre-reduction flux pelletizing plan

[0100] project Value Steel slag grain size range, mm 2~4 Grinding time, min45 Granularity of steel slag powder (in 0.074mm in mass proportion),%88 Dust removal...

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Abstract

The invention relates to a method for preparing pre-reduced fluxed pellets by taking steel slag as part of raw materials. The method comprises the following steps of (1) screening the steel slag, screening out steel slag particles with the particle size of 2-4 mm, and grinding the rest steel slag into steel slag powder; (2) drying fly ash, and grinding the fly ash into fly ash powder; (3) mixing the steel slag powder, the fly ash powder, iron oxide red, iron ore concentrate powder and a composite binder in a mixer; (4) taking the steel slag particles with the particle size of 2-4mm as a pelletizing core, and continuously putting the steel slag particles into a pelletizer for pelletizing to obtain green pellets; and (5) carrying out drying, preheating and roasting to obtain finished pelletsof the pre-reduced fluxed pellets. After the technical scheme is adopted in blast furnace production, the cost of blast furnace production is reduced, so that the market competitiveness of an iron-making process is enhanced, meanwhile, cyclic utilization of secondary resources of an iron and steel plant can be realized, then application of high-added-value products is realized, and further, greenmanufacturing of blast furnace smelting is realized.

Description

Technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing and using pre-reduced flux pellets using steel slag as part of the raw material. Background technique [0002] In modern ironmaking production technology, the blast furnace process as the main manufacturing process is self-evident for ironmaking production, occupying more than 90% of the pig iron production capacity. As for the ironmaking production process, the core is to use coke and coal powder to produce the necessary reducing agent in the furnace to reduce the furnace charge, so as to obtain the raw material pig iron required for subsequent products. The charging charge of the blast furnace is mainly composed of two types of materials: one type is iron-containing raw materials, mainly composed of sintered ore, pellets, and lump ore (a small amount of which will also contain granulated iron). Provides the necessary components required for the reduction o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C22B1/02C21B5/00
CPCC21B5/008C22B1/005C22B1/02C22B1/242Y02P10/20
Inventor 张立国王亮韩子文李仲张伟任伟李金莲
Owner ANGANG STEEL CO LTD
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