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A method for smelting reduction recovery and quenching and tempering treatment of mixed slag

A technology for quenching and tempering treatment and slag melting, which is applied in recycling technology, process efficiency improvement, cement production and other directions, can solve the problems of leaching polluted environment, polluted environment, massive accumulation of steel slag, etc., and achieves the effect of high efficiency and energy saving

Active Publication Date: 2018-05-04
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although steel slag can be utilized in the above-mentioned way, it is still subject to many limitations: (1) free CaO and MgO reduce the stability of steel slag volume; (2) higher content of iron oxide increases the difficulty of grinding; (3) When steel slag is directly returned to the metallurgical process for reuse, phosphorus will gradually be enriched in iron, which limits the application of steel slag; (4) steel slag is easy to pulverize; (5) fluorine and heavy metals may be leached by rainwater to pollute the environment
At present, the utilization rate of steel slag is only 20%, resulting in a large accumulation of steel slag, which pollutes the environment and wastes resources

Method used

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  • A method for smelting reduction recovery and quenching and tempering treatment of mixed slag

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Effect test

Embodiment 1

[0123] A method for smelting reduction recovery and quenching and tempering treatment of mixed slag is carried out according to the following steps:

[0124] Step 1, slag mixing

[0125] With the blast furnace slag obtained from the blast furnace slag outlet, the converter steelmaking molten steel slag obtained from the steel slag outlet, by mass ratio, blast furnace slag: converter steelmaking molten steel slag=(400: 4) kg batching, add the In the thermal insulation slag tank of graphite-dolomite composite thermal insulation refractory material, fully mix to obtain mixed slag; during the mixing process of slag, the iron oxide in the slag undergoes melting and reduction reaction, and the temperature of the slag after mixing is 1520°C. The temperature of the slag is in the range of 1350-1550°C;

[0126] Step 2, blowing gas for smelting reduction:

[0127] (1) Gas injection: Inject preheated oxygen into the mixed slag for 10 minutes, wherein the preheating temperature of oxyge...

Embodiment 2

[0142] A method for smelting reduction recovery and quenching and tempering treatment of mixed slag is carried out according to the following steps:

[0143] Step 1, slag mixing

[0144] The blast furnace slag obtained from the blast furnace slag outlet, the electric furnace steelmaking fused oxidized steel slag obtained from the steel slag outlet, by mass ratio, blast furnace slag: electric furnace steelmaking fused oxidized steel slag=(400:10) kg batching, add In the thermal insulation pit with carbon-magnesium composite thermal insulation refractory material, fully mix to obtain mixed slag; during the mixing process of slag, the iron oxide in the slag undergoes melting and reduction reaction, and the temperature of the slag after mixing is 1535°C , the temperature of the mixed slag is in the range of 1350-1550°C;

[0145] Step 2, blowing gas for smelting reduction:

[0146] (1) Gas injection: Inject preheated oxygen into the mixed slag for 8 minutes, wherein the preheatin...

Embodiment 3

[0160] A method for smelting reduction recovery and quenching and tempering treatment of mixed slag is carried out according to the following steps:

[0161] Step 1, slag mixing

[0162] With the blast furnace slag obtained from the blast furnace slag outlet, the converter steelmaking molten steel slag obtained from the steel slag outlet, by mass ratio, blast furnace slag: converter steelmaking molten steel slag=(400:40) kg batching, add the In the thermal insulation pit of graphite-spinel composite thermal insulation refractory material, the mixed slag is obtained by fully mixing; during the mixing process of the slag, the iron oxide in the slag undergoes melting and reduction reaction, and the temperature of the slag after mixing is 1565°C. The temperature of the mixed slag exceeds the set temperature by 1350-1550°C. After adding 10kg of blast furnace slag to the heat preservation pit, the temperature of the mixed slag is 1546°C;

[0163] Step 2, blowing gas for smelting re...

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Abstract

Disclosed is a method for mixed slag smelting reduction recycling and tempering. The method is carried out according to the following steps: (1) blast furnace slag and molten steel slag are mixed; (2) gas injection is carried out to carry out a smelting reduction; and (3) separation and recycling are carried out. According to the method, the blast furnace slag and the molten steel slag are mixed, then, an oxidizing gas is blown to carry out molten-reduction iron making, the iron in the mixed slag is recycled, phosphorus-rich phase recycling and slag tempering are achieved, and the reduced slag can serve as a slag cement, a cement regulator, an additive in cement production, a cement clinker or can be used for the production of a cement clinker with a high additional value.

Description

technical field [0001] The invention belongs to the fields of non-blast furnace ironmaking and resource comprehensive utilization, and in particular relates to a method for smelting reduction recovery and quenching and tempering treatment of mixed slag. Background technique [0002] As we all know, my country is the country with the largest steel output in the world. In 2015, the output of pig iron exceeded 700 million tons, and the output of crude steel exceeded 900 million tons. Ironmaking, steelmaking, and ferroalloy production are important process units of iron and steel production. Iron and steel metallurgical slag, such as blast furnace slag, steel slag, and ferroalloy slag, are produced during the production process. More than 400 million tons. [0003] Blast furnace slag is produced during the blast furnace reduction process. It not only contains reducing substances, such as coke, coal powder, carbon, carbon powder, etc., but also contains high content of CaO, SiO ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/06C21B11/00C04B7/147
CPCC04B7/147C21B3/06C21B11/00Y02P10/20Y02P40/10Y02W30/50
Inventor 张力张武
Owner NORTHEASTERN UNIV LIAONING
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