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Iron-carbon-silicon double-layer composite pellet for reforming converter slag and preparation method thereof

A double-layer composite and converter slag technology, applied in the field of steel slag comprehensive treatment, can solve the problems of increasing steel slag processing cost, limiting the use range of converter slag, and long reaction time, so as to shorten the reduction time and smelting cycle, increase the yield of molten iron, The effect of increasing travel and time

Active Publication Date: 2019-08-27
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The potential value of converter slag, a high-temperature-treated material, is far from being realized
The current research and practical application have proved that compared with blast furnace slag, RO phase, spinel phase, various iron-containing compounds, olivine phase, and metallic iron contained in converter slag are wear-resistant phases, which increase the processing efficiency of steel slag. cost, and the basicity of steel slag is high, there are more free calcium oxide and magnesium oxide in the slag, and the crystal grains of the gelling substance in the middle of the steel slag are dense, the reactivity is low, and the reaction time is long, which affects the stability of converter slag products , limiting the scope of use of converter slag

Method used

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  • Iron-carbon-silicon double-layer composite pellet for reforming converter slag and preparation method thereof

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Effect test

Embodiment 1

[0021] A preparation method for iron-carbon-silicon double-layer composite pellets for molten slag modification is produced by adopting inner and outer double-layer hopper cloth and pressure balls; the inner layer materials are 30% of iron tailings, 65% of blast furnace dust, and 5% of asphalt According to the proportion, use a mixer to make a mixture, put the mixture in a heating furnace and heat it to 350°C; the outer layer material is mixed with a mixer to make a mixture according to the ratio of 99.5% steel cutting and 0.5% asphalt, and then use internal and external The double-layer hopper is set at 50t / cm according to a certain flow ratio 2 Under the pressure of high pressure, the elliptical iron-carbon-silicon composite pellets with a diameter of 60mm and a certain strength are produced by a double-roller ball pressing machine.

Embodiment 2

[0023] A preparation method for iron-carbon-silicon double-layer composite pellets used in molten slag modification is produced by adopting inner and outer double-layer hopper cloth and pressing balls; the inner layer materials are 40% of iron tailings, 58% of blast furnace dust, and 2% of asphalt According to the proportion, use a mixer to make a mixture, put the mixture in a heating furnace and heat it to 500°C; the outer layer material is mixed with a mixer to make a mixture according to the proportion of steel cutting 93% and asphalt 7%, and then use internal and external The double-layer hopper is set at 40t / cm according to a certain flow ratio 2 Under the pressure of 50 mm in diameter, the elliptical iron-carbon-silicon composite pellets with a certain strength are made by a double-roller ball pressing machine.

Embodiment 3

[0025] A preparation method for iron-carbon-silicon double-layer composite pellets used in molten slag modification is produced by adopting inner and outer double-layer hopper cloth and pressing balls; the inner layer materials are 50% of iron tailings, 46% of blast furnace dust, and 4% of asphalt According to the proportion, use a mixer to make a mixture, put the mixture in the heating furnace and heat it to 450°C; the outer layer material is mixed with a mixer to make a mixture according to the ratio of 95% steel cutting and 5% asphalt, and then use internal and external The double-layer hoppers are respectively at 30t / cm according to a certain flow rate 2 Under the high pressure, the elliptical iron-carbon-silicon composite pellets with a diameter of 45 mm and a certain strength are produced by a double-roller ball pressing machine.

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Abstract

The invention discloses an iron-carbon-silicon double-layer composite pellet for converter slag modification and a preparation method thereof. The iron-carbon-silicon double-layer composite pellet isprepared by compositing an inner layer and an outer layer which are made of iron-carbon-silicon materials containing different components; the inner layer comprises the following components in percentage by mass: 30% to 60% of iron tailings, 35% to 65% of blast furnace dedusting ash and 1% to 6% of asphalt; the outer layer comprises the following components in percentage by mass: 90% to 99.5% of steel cuttings and 0.5% to 10% of asphalt; an iron-carbon-silicon composite pellet containing metallic iron, silicon dioxide, carbon and iron oxide serves as the outer layer; the mass of the outer layer accounts for 50% to 70% of the total mass of the iron-carbon-silicon double-layer composite pellet; and the mass the inner layer accounts for 30% to 50% pf the total mass of the iron-carbon-silicondouble-layer composite pellet.

Description

technical field [0001] The invention belongs to the technical field of steel slag comprehensive treatment, in particular to an iron-carbon-silicon double-layer composite pellet for reforming converter slag and a preparation method thereof. Background technique [0002] Converter slag is an industrial solid waste produced during the converter steelmaking process. For every ton of steel produced, 0.1 to 0.13 tons of steel slag should be produced at a temperature of about 1350°C to 1450°C. It also contains 10-30% total iron (TFe) and a large number of beneficial elements such as calcium, magnesium and silicon. At present, most iron and steel enterprises generally adopt simple magnetic separation, and except for a small part of the remaining tailings that are sold to cement factories, most of them are dumped, causing environmental pollution, land occupation and waste of resources. [0003] The pretreatment methods in the steel slag pretreatment part include: hot pouring method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/245C21B3/06
CPCC21B3/06C22B1/2406C22B1/245Y02W30/50
Inventor 唐复平李金莲廖相巍王亮任伟韩子文王再义张伟赵成林刘祥
Owner ANGANG STEEL CO LTD