A kind of rock wool directly prepared by melting sponge iron slag in an electric furnace and its preparation method

A technology of sponge iron and electric furnace, applied in the direction of glass manufacturing equipment, manufacturing tools, etc., can solve the problem of high energy consumption, achieve the effect of solving high energy consumption, saving energy consumption, and improving greenness

Active Publication Date: 2020-12-22
PEKING UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] The invention utilizes the slag of electric furnace steelmaking (that is, hot sponge iron slag), which can not only provide technical support for the clean production of the iron and steel industry, but also greatly reduce the production cost of rock wool, and solve the problem of high energy consumption in rock wool production. problems, improve the greenness of rock wool products

Method used

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  • A kind of rock wool directly prepared by melting sponge iron slag in an electric furnace and its preparation method
  • A kind of rock wool directly prepared by melting sponge iron slag in an electric furnace and its preparation method
  • A kind of rock wool directly prepared by melting sponge iron slag in an electric furnace and its preparation method

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preparation example Construction

[0035] The preparation method of the sponge iron involved in the embodiment is as follows:

[0036] (1) The iron ore is broken into particles with a particle size of about 3mm in a crusher;

[0037] (2) Put the crushed iron ore particles in step (1) into the tube furnace, control the temperature of the furnace to heat up to 1100°C at a rate of 10°C / min, and the furnace is always filled with N 2 as a shielding gas;

[0038] (3) Feed a reducing mixed gas for gas-solid reduction to obtain sponge iron; wherein, the main component of the reducing mixed gas is H with a molar ratio of 1:1 2 and CO, the temperature of the gas-solid reduction is kept at 1100° C., and the holding time is 2 hours.

Embodiment 1

[0040] The present embodiment provides a kind of rock wool, and the preparation method of described rock wool is as follows (as figure 1 shown):

[0041] (1) Put the sponge iron into the electric furnace at a rate of 30kg / (MW·min), and melt it at 1500°C for 30 minutes to obtain molten iron and sponge iron slag; the temperature of the sponge iron slag is 1470°C;

[0042] Wherein, the pseudo-binary phase diagram of the sponge iron slag is as follows figure 2 (a); In terms of mass percentage, the sponge iron slag comprises the following components:

[0043]

[0044] (2) The sponge iron slag at 1470°C is introduced into the spinning device (the main body is a three-roller centrifuge) through the drainage device. The speed configuration of the three-roller centrifuge is: 8000r / min for the distribution roller, 15000r / min for the first-stage acceleration roller, The secondary acceleration roller is 18000r / min; the high-pressure energy-carrying gas is passed through, and the roc...

Embodiment 2

[0050] The present embodiment provides a kind of rock wool, and the preparation method of described rock wool is as follows (as figure 1 shown):

[0051] (1) Put the sponge iron into the electric furnace at a rate of 30kg / (MW·min), and melt it at 1650°C for 60 minutes to obtain molten iron and sponge iron slag; the temperature of the sponge iron slag is 1600°C;

[0052] Wherein, the pseudo-binary phase diagram of the sponge iron slag is as follows figure 2 (b); In terms of mass percentage, the sponge iron slag comprises the following components:

[0053]

[0054] (2) The sponge iron slag at 1600°C is introduced into the spinning device (the main body is a three-roll centrifuge) through the drainage device. The speed configuration of the three-roll centrifuge is: 8000r / min for the distribution roller, 16000r / min for the first-stage acceleration roller, The two-stage acceleration roller is 20000r / min; the high-pressure energy-carrying gas is introduced, and the rock wool f...

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Abstract

The invention relates to the field of comprehensive utilization of resources and the field of preparation of inorganic nonmetallic materials, and especially relates to a rock wool directly prepared from electric furnace smelting separation sponge iron, and a preparation method thereof. The method for directly preparing the rock wool from electric furnace smelting separation sponge iron does not need to add any modifier, the acidity coefficient of the sponge iron slag is larger than 1.5, and the sponge iron slag contains 6-13% of FeO; and the sponge iron slag is preferably selected from slag obtained by taking sponge iron as a raw material for electric furnace steelmaking. The thermal-state sponge iron slag is directly used for preparing the rock wool, and process heat utilization and heatrecovery are combined, so energy consumption in the links of melt heating, centrifugal fiber forming and rock wool curing is saved, and the production cost of the rock wool is greatly reduced. The method realizes high-efficiency energy-quality coupling utilization of the slag of electric furnace steelmaking, achieves the purposes of energy conservation and emission reduction in the ferrous metallurgy industry, creatively and directly uses the sponge iron slag to prepare the rock wool without hardening and tempering, and has remarkable environmental, economic and social benefits.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of resources and the field of preparation of inorganic non-metallic materials, in particular to a rock wool directly prepared by melting sponge iron slag in an electric furnace and a preparation method thereof. Background technique [0002] Sponge iron is the product obtained by reducing iron concentrate or high-quality iron ore below the melting temperature, also known as direct reduced iron. The direct reduction iron process can be divided into gas-based direct reduction and coal-based direct reduction according to the type of reducing agent. In terms of reduction speed, product quality, energy consumption and environmental benefits, gas-based direct reduction has incomparable advantages over coal-based direct reduction. The gas-based direct reduction process mainly uses natural gas and coal-based gas as the reducing gas. Because the reduced iron ore or iron concentrate pellets are por...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/00C03C13/06C04B26/04C04B26/12
CPCC03B37/00C03C13/06C04B26/04C04B26/122C04B2201/20C04B2201/32C04B14/46
Inventor 王习东陈子威王昊陈为彬刘丽丽
Owner PEKING UNIV
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