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Multi-element pre-melting refining slag, production method thereof and production device thereof

A technology for refining slag and premelting, applied in the field of multi-component premelting refining slag, can solve the problems of effect influence, slow slag formation, long refining time, etc., and achieve the effect of improving production efficiency, good ductility, and saving mineral resources.

Inactive Publication Date: 2020-05-15
大连环球矿产股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the refining slag has only been sintered and has not reached a molten state, in the process of its use, the slag formation is slow and the refining time is long, which will affect the effect

Method used

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  • Multi-element pre-melting refining slag, production method thereof and production device thereof
  • Multi-element pre-melting refining slag, production method thereof and production device thereof
  • Multi-element pre-melting refining slag, production method thereof and production device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A device for producing multi-element premelted refining slag, said device comprising a shaft furnace 1;

[0041] The water outlet 2 of the shaft furnace 1 is connected with the stirring tank 3 provided with an insulating layer, and the insulating layer prevents heat loss;

[0042] The thermal insulation layer of the stirring tank 3 is provided with a thermocouple, and the stirring tank 3 is provided with an electric heating device, which is activated when the temperature is low to supplement heat and increase the temperature;

[0043] The feeding port 4 is arranged above the stirring tank 3;

[0044] The upper air inlet 5 and the lower air inlet 6 are arranged on the mixing tank 3 in opposite directions.

Embodiment 2

[0046] A method utilizing the device described in embodiment 1 to produce multi-element premelted refining slag, said method comprising the steps of:

[0047] The wollastonite tailings are crushed into 80-120mm blocks, impurities are removed by flotation, and the chemical composition of the wollastonite tailings is detected as: SiO 2 55.61wt%, CaO 29.93wt%, MgO 2.24wt%, Al 2 o 3 0.21wt%, loss on ignition 10.23wt%;

[0048] Put wollastonite tailings raw material into shaft furnace 1, use coke (ash content 10.5%) as fuel for melting, use air as coke combustion support, and release heat from coke combustion in the oxidation zone (or melting zone), and the temperature in this zone can reach 1450 -1720°C, the downward moving raw material is heated and melted into a melt, and the melt is sampled to detect the chemical composition as SiO 2 62.93wt%, CaO3 3.43wt%, MgO 2.58wt%, Al 2 o 3 1.02wt%, ∑: 99.95wt%;

[0049] The molten liquid enters the mixing tank 3 through the wate...

Embodiment 3

[0054] A method utilizing the device described in embodiment 1 to produce multi-element premelted refining slag, the difference from embodiment 2 is:

[0055] The powdery material is: soda ash with a particle size of 100 mesh, dolomite powder with a particle size of 100 mesh, and quartz powder with a particle size of 200 mesh. The chemical composition is shown in Table 1. According to the quality of the molten liquid, the molten liquid, soda ash, dolomite powder and quartz powder Calculate the addition amount of various powder materials according to the mass ratio of 57:7:21:15;

[0056] Control the flow rate of stirring gas 13m 3 / min, air pressure 0.5MPa, jet speed 6m / s, stirring the molten liquid for 10min.

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Abstract

The invention relates to multi-element pre-melting refining slag, a production method thereof and a production device thereof, and belongs to the technical field of a low-grade tailing resource comprehensive utilization technology and high-temperature object waste heat recycle. The multi-element pre-melting refining slag is composed of the following components of, in percentage by weight, 58%-63%of SiO2, 29%-34% of CaO, 5%-8% of MgO, 0.1%-1.5% of Al2O3, 0%-5% of Na2O, 0%-5% of K2O, 0%-5% of B2O3, and 0%-6% of MnO2. The refining material has the advantages that the oxygen potential is low, themelting point is low, and inclusions generated by deoxidation are easily absorbed, can effectively remove the aluminum oxide inclusions in molten steel, is widely applied to the production of specialsteel such as tire cord steel, and is a preferred refining material of the clean steel.

Description

technical field [0001] The invention relates to a multi-component premelted refining slag and its production method and production device, and belongs to the technical fields of comprehensive utilization of low-grade tailings resources and waste heat recovery and utilization of high-temperature objects. Background technique [0002] During the steel smelting process, the deoxidizer and alloy additives added during deoxidation alloying react with the dissolved oxygen in the steel to form a large number of non-metallic inclusions, such as Al 2 o 3 Mainly produced in the aluminum deoxidation process, it is a brittle non-deformable inclusion with a high melting point. Larger-sized inclusions in molten steel can be removed by collision to form large particles, while small-sized spherical or polygonal Al 2 o 3 The inclusions are not easy to gather and float, and will solidify in the continuous casting slab with the molten steel. These Al 2 o 3 The inclusions are easily broken...

Claims

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Application Information

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IPC IPC(8): C21C7/06
CPCC21C7/06
Inventor 张延大
Owner 大连环球矿产股份有限公司
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