Method for recycling iron on line from iron-containing industrial slag and preparing glass ceramics frit

A technology of glass-ceramics frit and glass-ceramics, which is applied in the fields of comprehensive utilization of resources and material preparation, high value-added utilization of metallurgical slag and preparation of glass-ceramics, and can solve the problems of no iron recovery and coarse adjustment and modification

Inactive Publication Date: 2010-12-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these patents all adopt a one-step method, that is, directly modify high-temperature industrial waste slag into qualified slag t

Method used

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  • Method for recycling iron on line from iron-containing industrial slag and preparing glass ceramics frit
  • Method for recycling iron on line from iron-containing industrial slag and preparing glass ceramics frit

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The composition of the converter slag discharged from the front of a steel plant is 12.92% SiO 2 , 0.79% Al 2 o 3 , 29.18% CaO, 3.58% MgO, 42.29% TFe, 26.35% MFe, 13.25% FeO, 8.03% Fe 2 o 3 , 2.46% MnO, 1.80% P 2 o 5 , 0.15% R 2 O (R is a monovalent metal ion). This steel slag is remelted to form ferrous industrial slag.

[0030] according to figure 1 In the process shown, in the rough adjustment and upgrading, a modifier consisting of 34% fly ash, 5% quartz sand, and 10% waste refractories by the weight of steel slag, and a reducing agent consisting of 13% coal powder by weight of steel slag were added In the high-temperature slag, and stir evenly, so that the basicity of the slag reaches 1.1; after holding at 1550°C for 20 minutes, pour the slag into the fine-tuning reaction bag, and the remaining molten iron is recovered. The recovery rate of iron in steel slag reaches 95%.

[0031] In fine-tuning and upgrading, in order to make the slag composition meet the ...

Embodiment 2

[0033] The chemical composition of converter steel slag discharged from a steel plant is 20.23% SiO 2 , 1.36% Al 2 o 3 , 38.58% CaO, 4.63% MgO, 26.8% Fe 2 o 3 , 3.46% MnO, 2.9% P 2 o 5 , 0.96% TiO 2 , 0.5 % TiO 2 . This steel slag is remelted to form ferrous industrial slag.

[0034] according to figure 1 In the process shown, in the rough adjustment and upgrading, the modifier consisting of 36% fly ash, 15% tailings sand, and 5% converter dust and sludge equivalent to the weight of steel slag, and the reducing agent consisting of 15% coal powder by weight of steel slag were added In the high-temperature slag, and stir evenly, so that the basicity of the slag reaches 1.05; after holding at 1550°C for 20 minutes, pour the slag into the fine-tuning reaction bag, and the remaining molten iron is recovered. The recovery rate of iron in steel slag reaches 96%.

[0035] In fine-tuning and upgrading, in order to make the slag composition meet the requirements of slag glass...

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Abstract

The invention relates to a method for recycling iron on line from iron-containing industrial slag and preparing a glass ceramics frit, belonging to the technical field of resource comprehensive utilization and material preparation and mainly comprising a two-step method process of iron-containing industrial slag online rough adjustment and modification for reducing iron and fine adjustment and modification for preparing the frit. The method comprises the steps of: discharging high-temperature iron-containing slag into a high-temperature furnace device, and simultaneously adding a reducing agent and a modifying agent to ensure that slag components are adjusted to reach the optimal component point in which iron oxide is reduced; after fully reacted, separating reduced molten iron from the slag, and recycling to obtain high-temperature molten iron; further adding a modifying agent and an adjusting agent into the slag remained after the separation to ensure that the slag components are adjusted to achieve the quality requirement of slag glass ceramics on the frit; and water-hardening, drying and grading the qualified slag to prepare the glass ceramics frit. The invention realizes multiple purposes that the heat of the slag is directly utilized and metal iron is recycled to prepare a high addition value product as well as solid wastes are massively utilized, and the like.

Description

technical field [0001] The invention belongs to the technical field of resource comprehensive utilization and material preparation, especially in the fields of high value-added utilization of metallurgical slag and preparation of glass ceramics. Background technique [0002] As we all know, my country's metallurgical and other industries discharge a large amount of high-temperature iron-containing slag, including molten converter steel slag, electric furnace steel slag, stainless steel slag, nickel slag, and iron-containing molten ferroalloy slag, refining slag, power plant liquid slag, desulfurization slag, phosphorus slag, etc. [0003] At present, the method of directly cooling and reusing these high-temperature slags is generally adopted. This method has the problems of sensible heat utilization, effective recovery of ferrite resources, and high value-added utilization of slag, which have not been solved. The traditional method of grading, crushing and magnetic separatio...

Claims

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Application Information

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IPC IPC(8): C21B3/06C21B11/00C03C10/00C03C6/10
CPCY02P10/20Y02W30/50
Inventor 李宇刘晓明张玲玲苍大强杨志杰
Owner UNIV OF SCI & TECH BEIJING
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