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On-line molten steel slag modification method

A liquid steel slag and modification technology, applied in the field of iron and steel metallurgy, can solve the problems of ineffective utilization, large consumption of water resources, and high input cost, and achieve the effects of sufficient raw material sources, reduction of modification costs, and low procurement costs.

Active Publication Date: 2015-06-03
马鞍山市华东冶金科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems existing in the prior art: 1) steel slag, as a precious resource, has been piled up in large quantities and cannot be effectively utilized; 2) the existing steel slag treatment means consume large amounts of water resources, have high input costs and pollute the environment defects of the liquid steel slag, and provides an online modification method for liquid steel slag; the present invention does not follow the current popular research and development direction of solid-state modification, and directly performs thermal modification on molten steel slag, which not only makes full use of the waste heat of molten steel slag, but also due to The invention uses carbonate substances to modify the steel slag, which conforms to the principle of iron and steel metallurgy, and can effectively decompose the carbonate into oxides to modify the steel slag, and the modified high-alkalinity steel slag can mostly replace the converter slagging agent , so that steel slag can be reused

Method used

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  • On-line molten steel slag modification method

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Effect test

Embodiment 1

[0024] A steel slag modifier of this embodiment comprises the following components in mass percentage: 25% of dolomite, 40% of limestone, 15% of magnesite and 20% of siderite. The particle sizes of the carbonate minerals dolomite, limestone, magnesite and siderite are all less than 50 mm, and setting the particle size in this embodiment to be smaller than 50 mm will facilitate internal thermal decomposition of massive carbonate minerals. In this embodiment, dolomite, limestone, and magnesite are used to adjust the alkalinity and magnesium oxide content of liquid steel slag, and siderite is used to adjust the melting point of liquid steel slag. The specific modification principle will be described below. The steel slag modifier of this embodiment has sufficient sources of raw materials and low purchase cost, which reduces the cost of steel slag modification and is convenient for popularization and application.

[0025] In this embodiment, the specific process of using the steel...

Embodiment 2

[0031] An online modification method of liquid steel slag in this embodiment is basically the same as in Embodiment 1, except that the steel slag modifier of this embodiment includes the following components in mass percentage: 5% dolomite, 85% limestone, Magnesite 5% and Siderite 5%. In this embodiment, low-phosphorus converter slag with a temperature of 1350°C (the mass percentage of phosphorus is less than 2%) and the mixed and dried steel slag modifier are poured into the slag ladle at the same time, and the balance between the steel slag modifier and the liquid steel slag is controlled. The ratio of feeding rate is equal to the mass ratio of steel slag modifier to liquid steel slag, the mass percentage of steel slag modifier to the total mixture is 15.0%, the mixture is cooled to 500°C, and the modification is completed.

Embodiment 3

[0033] A method for on-line modification of liquid steel slag in this embodiment is basically the same as in Embodiment 1, except that the steel slag modifier of this embodiment includes the following components in mass percentage: 15% of dolomite, 15% of limestone, Magnesite 40% and Siderite 30%. In this embodiment, low-phosphorus converter slag with a temperature of 1400°C (the mass percentage of phosphorus is less than 2%) and the mixed and dried steel slag modifier are poured into the slag ladle at the same time, and the balance between the steel slag modifier and the liquid steel slag is controlled. The ratio of feeding rate is equal to the mass ratio of steel slag modifier to liquid steel slag, the mass percentage of steel slag modifier to the total mixture is 40.0%, the mixture is cooled to 500°C, and the modification is completed.

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Abstract

The invention discloses an on-line molten steel slag modification method, and belongs to the technical field of ferrous metallurgy. The on-line molten steel slag modification method comprises the following steps: firstly, while slag is simultaneously discharged from smelting devices such as a rotary furnace, an electric furnace and an LF furnace, uniformly mixing liquid steel slag and a steel slag modifier with certain granularity according to a certain mass ratio, and subsequently cooling. The steel slag modifier is one or more carbonate substances, and the carbonate substances are carbonate compounds or carbonate minerals. By adopting the steel slag modification technique disclosed by the invention, heat of the steel slag can be efficiently utilized to decompose the steel slag modifier into oxides, at the same time, the energy consumption of a multi-stage crushing process used in steel slag treatment can be reduced, and the modified high-alkalinity steel slag is equivalent to synthesized slag, so that the steel slag can be conveniently and repeatedly utilized.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, and more specifically relates to a method for online modification of liquid steel slag by using a steel slag modifier. Background technique [0002] Steel slag, as the waste slag of steelmaking, generally accounts for about 15% of crude steel output. In recent years, with the rapid development of my country's iron and steel industry, the accumulation of steel slag has increased year by year, which not only occupies a large amount of land, but also causes serious environmental pollution. Steel slag cannot be used directly under normal circumstances, and the two-step slag utilization mode of "stabilization pretreatment-subsequent utilization" is generally adopted at present. First of all, in terms of cognition, the existing slag utilization mode still stays in solving the problems of free calcium oxide and tricalcium silicate aging phase separation and accompanying structural dam...

Claims

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Application Information

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IPC IPC(8): C21C5/36C21C5/54
Inventor 范鼎东
Owner 马鞍山市华东冶金科技发展有限公司
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