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A steel slag modifier

A technology of modifier and steel slag, which is applied in the field of iron and steel metallurgy, can solve the problems of large water resource consumption, effective recycling, and high input costs, and achieve the effects of fast slag removal, reduced modification costs, and low procurement costs

Active Publication Date: 2017-04-19
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

[0008] The purpose of the present invention is to overcome the problems existing in the prior art: 1) steel slag, as a precious resource, cannot be recycled and effectively utilized in iron and steel enterprises in large quantities; environmental defects; the present invention does not follow the currently popular research and development direction of solid-state reforming, and directly conducts thermal reforming of molten steel slag, which not only makes full use of the waste heat of molten steel slag, but also uses carbonate substances to carry out Modification, in line with the principles of iron and steel metallurgy, can effectively decompose carbonates into oxides to modify steel slag, and after modification, high-alkalinity steel slag can mostly replace converter slagging agent, so that steel slag can be reused

Method used

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  • A steel slag modifier

Examples

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Effect test

Embodiment 1

[0023] 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.

[0024] In this embodiment, the specific process of using the steel...

Embodiment 2

[0030] A steel slag modifier of the present embodiment is basically the same as that of Embodiment 1, except that the steel slag modifier of the present embodiment comprises the following components in mass percentage: 5% of dolomite, 85% of limestone, magnesite Ore 5% and Siderite 5%. In this example, low-phosphorus converter slag with a temperature of 1350°C (mass percentage of phosphorus is less than 2%) and the mixed and dried steel slag modifier are poured into the slag bag at the same time, and the impact force of the slag is used to transform the slag and steel slag. The quality agent is mixed evenly, the mass percentage of the steel slag modifier to the total mixture is 15.0%, the mixture is cooled to 500°C, and the modification is completed.

Embodiment 3

[0032] A steel slag modifier of the present embodiment is basically the same as that of Embodiment 1, except that the steel slag modifier of the present embodiment comprises the following components in mass percentage: 15% of dolomite, 15% of limestone, magnesite Ore 40% and Siderite 30%. In this example, the low-phosphorus converter slag (the mass percentage of phosphorus is less than 2%) and the mixed and dried steel slag modifier are used and poured into the slag bag at the same time, and the impact force of the slag is used to transform the slag and steel The quality agent is mixed evenly, the steel slag modifier accounts for 40.0% by mass of the total mixture, the mixture is cooled to 500°C, and the modification is completed.

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Abstract

The invention discloses a steel slag modifier, belonging to the technical field of ferrous metallurgy; the steel slag modifier disclosed by the invention is one or more carbonate matters; and the carbonate matters are carbonate compounds or carbonate minerals. According to the invention, from the metallurgy principle at first, the key elements for utilizing the steel slag repetitively and circularly are analyzed so as to increase the alkalinity of the modified steel slag and the circularly utilized dephosphorizing capacity of a converter; after carbonate (CaCO3, MgCO3 and FeCO3) is mixed with liquid steel slag, oxides generated by thermal decomposition by heating have high utilization value to converter steelmaking; therefore, the steel slag is modified through physical and chemical changes by utilizing the carbonate minerals cheap and easy to obtain; the modified steel slag is a good slagging material; the recycled utilization ratio is high; better benefits are created for enterprises; and furthermore, the environment problem due to external discharge of the steel slag is solved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, and more specifically relates to a steel slag modifier for online modification of liquid steel slag. 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. However, as a valuable secondary resource, steel slag has the value of replacing metallurgical charge. Therefore, the realization of the internal circulation of steel slag in iron and steel enterprises has always been valued ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/06C21C5/28
CPCC21B3/06C21C5/28Y02P10/20Y02W30/50
Inventor 范鼎东邓爱军
Owner 马鞍山市华东冶金科技发展有限公司
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