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Method for preparing premelted refining slag by using converter slag and aluminum slag

A technology of converter slag and refining slag, which is applied in the field of preparing premelted refining slag, can solve the problems of unfavorable natural resource protection and high energy consumption, achieve good desulfurization thermodynamic conditions, simple preparation process, and reduce oxidation

Inactive Publication Date: 2011-03-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent 200610039275.1 uses lime and high-purity Al 2 o 3 Adding a slagging agent that lowers the melting point to produce pre-melted refining slag for ultra-pure steel. The above methods all use natural minerals as raw materials, which is not conducive to the protection of natural resources and high energy consumption
Chinese patent 03143306.5 uses the tricalcium aluminate solid solution associated with the deep desilication process in the sintering alumina production process as the base material, and adds hydrated sodium aluminosilicate, calcite, magnesia and other materials to prepare refining slag. Slag, but still with about 30% natural minerals

Method used

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  • Method for preparing premelted refining slag by using converter slag and aluminum slag
  • Method for preparing premelted refining slag by using converter slag and aluminum slag
  • Method for preparing premelted refining slag by using converter slag and aluminum slag

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Embodiment 1

[0041] The specific process of preparing premelted refining slag from converter slag and aluminum slag is as follows:

[0042] (1) Selection of raw materials

[0043] The components of converter slag and aluminum slag used are shown in Table 2 and Table 3.

[0044] (2) Ingredients

[0045] The mass ratio of converter slag to aluminum slag is 2.5:1.

[0046] (3) Smelting of pre-melted refining slag: The converter slag is melted in a high-temperature furnace, and the temperature is controlled at 1550°C to ensure its good fluidity. After the converter slag is completely melted, the aluminum slag is added in three batches, and the addition amount of each batch is respectively 50%, 25% and 25% of the total addition amount according to the mass ratio, and the time interval between each batch is 5min. Each batch of aluminum slag added is stirred with nitrogen to ensure uniform reduction reaction and promote the improvement of reaction speed.

[0047] (4) Separation of slag and ir...

Embodiment 2

[0056] The specific process of preparing premelted refining slag from converter slag and aluminum slag is as follows:

[0057] (1) Selection of raw materials

[0058] The components of converter slag and aluminum slag used are shown in Table 2 and Table 3.

[0059] (2) Ingredients

[0060] The mass ratio of converter slag to aluminum slag is 2.3:1.

[0061] (3) Smelting of pre-melted refining slag: The converter slag is melted in a high-temperature furnace, and the temperature is controlled at 1600°C to ensure its good fluidity. After the converter slag is completely melted, the aluminum slag is added in three batches, and the addition amount of each batch is respectively 50%, 25% and 25% of the total addition amount according to the mass ratio, and the time interval between each batch is 4min. Each batch of aluminum slag added is stirred with nitrogen to ensure uniform reduction reaction and promote the improvement of reaction speed.

[0062] (4) Slag and iron separation:...

Embodiment 3

[0066] The specific process of preparing premelted refining slag from converter slag and aluminum slag is as follows:

[0067] (1) Selection of raw materials

[0068] The components of converter slag and aluminum slag used are shown in Table 2 and Table 3.

[0069] (2) Ingredients

[0070] The mass ratio of converter slag to aluminum slag is 2.1:1.

[0071] (3) Smelting of pre-melted refining slag: The converter slag is melted in a high-temperature furnace. In order to ensure its good fluidity, the temperature is controlled at 1500°C. After the converter slag is completely melted, add the aluminum slag in three batches, the amount of each batch is 50%, 25% and 25% of the total amount by mass ratio, and the time interval between each batch is 3min. Each batch of aluminum slag added is stirred with nitrogen to ensure uniform reduction reaction and promote the improvement of reaction speed.

[0072] (4) Separation of slag and iron: After the last batch of aluminum slag is add...

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Abstract

The invention relates to a method for preparing premelted refining slag by using converter slag and aluminum slag, which comprises the following steps: selecting raw materials according to the requirement that the content of metallic aluminum in the aluminum slag is greater than or equal to 20% in mass percent; proportioning the raw materials under the condition that the mass ratio of the converter slag to the aluminum slag is (2.0-2.5):1; controlling the smelting temperature of the premelted refining slag at 1500-1600 DEG C, adding the aluminum slag in three batches after the converter slag is completely molten down, and standing for 20-30min after the last batch of aluminum slag is added and stirred uniformly, thereby realizing the purpose of separating slag from iron in a molten pool; and cooling the prepared premelted refining slag to the normal temperature, crushing the prepared premelted refining slag to the particles of which the particle size range is within 5-30mm, and then, packaging the particles. On the basis of ensuring the refining effect, the method of the invention completely uses industrial slag materials as raw materials, thereby protecting the natural mineral resources, widening the utilization ways of the converter slag and the aluminum slag as resources, and partially realizing the cyclic utilization of the converter slag in iron and steel production processes.

Description

technical field [0001] The invention relates to the technical field of metallurgy and environmental protection, and relates to a resource utilization technology of solid waste in the metallurgical industry, in particular to a method for preparing premelting and refining slag by utilizing converter slag and aluminum slag. Background technique [0002] Converter slag mainly contains CaO, SiO 2 , FeO, Fe 2 o 3 , MnO, Al 2 o 3 , MgO, P 2 o 5 The components such as S and S are mainly derived from the addition of slagging agents such as lime, dolomite, iron ore and iron oxide scale during the converter smelting process, the oxidation of aluminum, silicon, manganese and other elements in molten iron and scrap steel, and the erosion of lining refractory materials. Calculated on the basis that the converter slag emission per ton of steel is 10~15kg, the world output of converter steel was 853 million tons in 2009, and about 100 million tons of converter slag were produced, amon...

Claims

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Application Information

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IPC IPC(8): C21C7/076C21B3/06
CPCY02P10/20Y02W30/50
Inventor 闵义姜茂发刘承军
Owner NORTHEASTERN UNIV
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