A method of recycling converter molten steel slag to produce concrete admixture

A molten, concrete technology, applied in climate sustainability, sustainable waste treatment, solid waste management, etc., which can solve the problem of iron oxide recovery without considering magnesium oxide content, utilization rate of only 40%, and long treatment cycle. and other problems, to achieve the effect of maintaining a virtuous cycle, reducing the difficulty of grinding, and low basicity of converter slag

Active Publication Date: 2018-11-13
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2015, China's steel slag output exceeded 100 million tons, but its utilization rate was only 40%
Although this application can improve the hydration and gelation activity of converter steel slag, it does not take into account the high content of magnesium oxide in the slag and the recovery of iron oxides, and the treatment period for slag is relatively long

Method used

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  • A method of recycling converter molten steel slag to produce concrete admixture
  • A method of recycling converter molten steel slag to produce concrete admixture

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Effect test

Embodiment 1

[0053] In this embodiment, a method for recovering molten steel slag from a converter to produce a concrete admixture. The raw materials for the production of the concrete admixture include 90% by mass of the molten steel slag in the early stage of the converter and 10% reducing agent. The molten steel slag in the early stage of the converter includes the following components by mass percentage: CaO, 37%, SiO 2 , 29%, FeO, 25%, MgO, 4%, Al 2 O 3 , 3%, the rest is unavoidable impurities. The reducing agent is ferrosilicon with a particle size of 5-10mm. Combine figure 1 , The steps for producing concrete admixture in this embodiment are:

[0054] (1) Pour the slag of the converter double slag retention method with a temperature of 1450°C and a slag basicity of 1.0 into the furnace, add the ferrosilicon reducing agent when the steel slag is poured into the furnace, and transport the furnace to the stirring device , Stir and mix the steel slag and the reducing agent, and then stand...

Embodiment 2

[0058] In this embodiment, a method for recovering molten steel slag from a converter to produce concrete admixtures. The raw materials for the production of concrete admixtures include 93% by mass of the molten steel slag in the early stage of the converter and 7% of the reducing agent. Steel slag includes the following components by mass percentage: CaO, 45%, SiO 2 , 25%, FeO, 20%, MgO, 5%, Al 2 O 3 , 2.5%, the rest are unavoidable impurities. The reducing agent is ferrosilicon with a particle size of 10-30mm.

[0059] Combine figure 1 , The steps for producing concrete admixture in this embodiment are:

[0060] (1) Pour the slag of the converter double slag retention method with a temperature of 1350°C and a slag basicity of 1.8 into a furnace. The furnace is an improved slag pot, the outer shell is steel plate, and the inner wall is a refractory insulation furnace lining. Add ferrosilicon reducing agent during the process of pouring steel slag into the furnace, transport the f...

Embodiment 3

[0064] In this embodiment, a method for recovering molten steel slag from a converter to produce concrete admixtures. The raw materials for producing concrete admixtures include 95% by mass of the molten steel slag in the early stage of the converter and 5% of the reducing agent. Steel slag includes the following components by mass percentage: CaO, 41%, SiO 2 , 29%, FeO, 18%, MgO, 6%, Al 2 O 3 , 3%, the rest is unavoidable impurities. The reducing agent is ferrosilicon with a particle size of 30-50mm.

[0065] Combine figure 1 , The steps of producing concrete admixture in this embodiment are:

[0066] (1) The slag of the converter double slag retention method with a temperature of 1500°C and a slag basicity of 2.0 is poured into a furnace. The furnace is an improved slag pot, the outer shell is steel plate, and the inner wall is a refractory insulation furnace lining. Add ferrosilicon reducing agent when steel slag is poured into the furnace, transport the furnace to the stirring...

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Abstract

The invention discloses a method for recovering converter molten steel slag to produce a concrete admixture, belonging to the technical field of comprehensive utilization of steel slag resources. The method comprises the following steps: pouring converter earlier-stage molten steel slag into a smelting furnace while adding a reducer; uniformly stirring and mixing, standing for 0.5-1.0 hour, quickly cooling the molten steel slag by water quenching or air quenching, and returning the residual solid steel block into the converter; and finally, grinding the dried steel slag into the concrete admixture. By using silicon iron as the reducer, abundant heat is generated along with the reaction between silicon and iron oxides, thereby satisfying the heat supply in the whole reduction and slack quenching process. The water quenching or air quenching is adopted for quick cooling, thereby enhancing the hydration and gelation activity of the steel slag. The method implements comprehensive recovery on molten steel slag, solves the problem of discharge of steel slag, can lower the production cost of concrete, and thus, has favorable economic and environmental benefits.

Description

Technical field [0001] The invention relates to the technical field of comprehensive utilization of steel slag resources, and more specifically, to a method for recovering molten steel slag in a converter to produce concrete admixtures. Background technique [0002] In recent years, as China's steel output has continued to rise, the output of steel slag has also increased sharply as a by-product of the steelmaking process. In 2015, China's steel slag output exceeded 100 million tons, but its utilization rate was only 40%. A large amount of steel slag stored in the open air all the year round not only takes up a lot of land, but also contains harmful elements such as soluble chromium ions, which pollute the surface and underground water sources and endanger people's lives. In addition, the world is currently facing the dilemma of resource shortage. Steel slag has become a kind of resource, and it is of great significance for the large-scale effective utilization of steel slag. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B5/06C04B18/14
CPCC04B5/06C04B18/142Y02W30/91
Inventor 李媛范鼎东沈乾坤邓爱军
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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