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Steel slag treating method

A treatment method, steel slag technology, applied in the field of steel slag treatment, can solve problems such as environmental pollution and waste of land resources, and achieve the effects of cost reduction, energy saving, and high social and economic significance

Active Publication Date: 2012-07-11
北京联合荣大工程材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a large amount of steel slag is still stored as industrial waste, which not only causes environmental pollution, but also wastes land resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1, a kind of steel slag processing method comprises the following steps:

[0025] An electric arc furnace is built near the ironworks, and the 1400°C converter steel slag and the 1400°C blast furnace slag are proportioned by weight: 50% of the hot converter steel slag and 50% of the blast furnace slag are transported into the electric furnace. The mixing of slag liquid promotes the reaction,

[0026] The deposited metal iron is discharged every 2 hours at the bottom of the electric furnace,

[0027] Adjust the temperature at 1400°C-1500°C and keep it warm until the reaction is complete.

[0028] After the reaction, the slag flows out from the slag mouth and is quenched and quenched in water, dried, crushed, and ground to make high-activity slag powder.

[0029] Samples were taken for mineral analysis, and more than 91% were glass phases.

[0030] The cement prepared by mixing 60% of the prepared slag powder with silicate clinker and coagulant can reach the...

Embodiment 2

[0032] An electric arc furnace is built near the ironworks, and liquid converter steel slag and liquid blast furnace slag are proportioned by weight: 70% of hot converter steel slag and 30% of blast furnace slag are transported into the electric furnace. Mixing promotes the reaction,

[0033] The deposited metal iron is released every 1.5h at the bottom of the electric furnace,

[0034] Adjust the temperature at 1300°C-1500°C and keep warm until the reaction is complete.

[0035] After the reaction, the slag flows out from the slag mouth and is quenched and quenched in water, dried, crushed, and ground to make high-activity slag powder.

[0036] Samples were taken for mineral analysis, and more than 90% were glass phases.

[0037] 40% of the prepared slag powder is equivalent to replace PO42.5 cement, and the cement strength index of the configuration and the cement strength index of PO42.5 will not decrease.

Embodiment 3

[0039] An electric arc furnace is built near the ironworks, and the hot steel slag released from the converter and the liquid blast furnace slag are proportioned by weight: 30% of the hot steel slag and 70% of the blast furnace slag are transported into the electric furnace. Seed slag mixed to promote the reaction,

[0040] The deposited metal iron is released every 3 hours at the bottom of the electric furnace,

[0041] Adjust the temperature at 1300°C-1500°C and keep warm until the reaction is complete.

[0042] After the reaction, the slag flows out from the slag mouth and is quenched and quenched in water, dried, crushed, and ground to make high-activity slag powder.

[0043] Samples were taken for mineral analysis, and more than 93% were glass phases.

[0044] The cement prepared by mixing 60% of the prepared slag powder with silicate clinker and coagulant can reach the technical index of PO42.5 cement.

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Abstract

The invention provides a steel slag treating method comprising the following steps of: directly mixing thermal-state revolving furnace steel slag with blast furnace slag in an arc furnace in proportion, adjusting the molten slag in the furnace into a proper temperature by virtue of the arcing of the arc furnace, and stirring the molten slag by virtue of arc disturbance, so that acidic oxide and basic oxide in the molten slag are sufficiently reacted with each other; reacting free calcium oxide and free magnesium oxide in the raw steel slag with silicon dioxide component and low-calcium calcium silicate in the blast furnace slag to generate safe calcium silicate and magnesium silicate, quenching the molten slag to form glass-state solid slag which is higher in hydration reactivity and free of short-term or long-term inflation harm, and further finely grinding the solid slag into slag powder which can be safely used for related building material as the blast furnace slag. According to the method, the damage caused by the free calcium oxide and free magnesium oxide in the steel slag can be removed, and a basis is provided for the whole use of the steel slag. The heat energy of the thermal-state molten slag can be sufficiently used, so that the energy source can be saved, the energy consumption can be reduced, the cost can be reduced, and the discharge of CO2 can be reduced, and the method is extremely high in social meaning and economic meaning.

Description

technical field [0001] The invention relates to a steel slag processing method. In particular, it relates to a harmless treatment method for free calcium oxide and free magnesium oxide in steel slag, so as to improve the utilization rate of steel slag. Background technique [0002] With the acceleration of industrialization and urbanization in our country, the resource consumption in the industrial field will further increase, resource and environmental problems will become more prominent, and industrial development will face more severe challenges. Further improving the comprehensive utilization level of bulk industrial solid waste will be It is one of the effective ways to solve resource supply and relieve environmental pressure. In 2011, my country's key statistics showed that the production of blast furnace slag was 150 million tons, and the production of steel slag was 58.93 million tons. At present, blast furnace slag has been fully utilized in the building materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06
CPCY02W30/50
Inventor 章荣会皮艳灵
Owner 北京联合荣大工程材料股份有限公司
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