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A kind of slagging method using calcite instead of lime in converter

A technology of calcite and slagging, applied in the manufacture of converters, etc., can solve problems such as greenhouse effect, waste of heat, and dust pollution, and achieve the effects of reducing production costs, improving utilization, and high activity

Active Publication Date: 2019-01-25
SICHUAN DAZHOU IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of lime production will absorb a lot of heat, and after the lime is burned, it must be cooled to a suitable temperature before it can be transported to the steelmaking plant. The whole process wastes a lot of heat, and the carbon dioxide generated will cause the greenhouse effect when emitted into the air. The generated dust will pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1. The experiment was carried out in an 80t converter, and calcite was purchased. The theoretical chemical composition of calcite is 51.82% in mass fraction of calcium oxide, 39.14% in mass fraction of carbon dioxide, 1.57% in mass fraction of silicon dioxide, and the particle size of calcite is 10 ~50mm.

[0057] 2. Calculate the materials used for slagging: 79t of molten iron requires a total of 3497kg of lime, and each kilogram of lime can be replaced by 1.7kg of calcite, which requires a total of 1232kg of calcite and 2772kg of lime.

[0058] 3. Calculate the amount of molten iron and steel scrap transferred into the converter: 79t of molten iron and 4t of scrap steel.

[0059] 4. Add 1.0t of calcite to the bottom after slag splashing in the converter. After the oxygen lance is ignited successfully for 30 seconds, add the remaining 2 / 3 of calcite and 2 / 3 of lime in batches according to the temperature rise in the early stage. Add 232kg of calcite and lime for each b...

Embodiment 2

[0063] 1. The experiment was carried out in an 80t converter, and calcite was purchased. The theoretical chemical composition of calcite is 51.82% in mass fraction of calcium oxide, 39.14% in mass fraction of carbon dioxide, 1.57% in mass fraction of silicon dioxide, and the particle size of calcite is 10 ~50mm.

[0064] 2. Calculation of materials for slagging: 79t of molten iron requires a total of 3478kg of lime, and each kilogram of lime can be replaced by 1.7kg of calcite, which requires a total of 1463kg of calcite and 2618kg of lime.

[0065] 3. Calculate the amount of molten iron and steel scrap transferred into the converter: 79t of molten iron and 3t of scrap steel.

[0066] 4. Add 1.0t of calcite to the bottom after slag splashing in the converter. After the oxygen lance is ignited successfully for 30 seconds, add the remaining 2 / 3 of calcite and 2 / 3 of lime in batches according to the temperature rise in the early stage. Add 200kg of calcite for each batch, lime A...

Embodiment 3

[0070] 1. The experiment was carried out in an 80t converter, and calcite was purchased. The theoretical chemical composition of calcite is 51.82% in mass fraction of calcium oxide, 39.14% in mass fraction of carbon dioxide, 1.57% in mass fraction of silicon dioxide, and the particle size of calcite is 10 ~50mm.

[0071] 2. Calculation of slag-making materials: 81t of molten iron requires a total of 3575kg of lime. Each kilogram of lime can be replaced by 1.7kg of calcite. A total of 1963kg of calcite and 2420kg of lime are required.

[0072] 3. Calculate the amount of molten iron and steel scrap transferred into the converter: 81t of molten iron and 1.2t of scrap steel.

[0073] 4. Add 1.3t of calcite to the bottom after slag splashing in the converter. After the oxygen lance is ignited successfully for 30 seconds, add the remaining 2 / 3 of calcite and 2 / 3 of lime in batches according to the temperature rise in the early stage. Add 200kg of calcite for each batch, lime Add 50...

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Abstract

The invention discloses a slagging method with lime replaced with calcite in a converter. The slagging method comprises the following steps that (1) the suitable calcite is selected for replacing part of the lime, and the calcite and lime not be replaced form a slagging material; (2) the dosage of the slagging material is calculated; (3) the thermal balance in the converter is calculated, and the charging amounts of melted iron and scrap steel are adjusted; (4) the slagging material are added in batches, and the oxygen supply amount in the converter is adjusted; and (e) smelting end point temperature testing, sampling and tapping preparing are conducted. Efficient utilizing of the mineral resources is achieved, meanwhile, production cost is reduced, energy saving and emission reducing are realized, and environmental pollution is reduced.

Description

technical field [0001] The invention relates to the field of converter steelmaking, in particular to a slagging method in which calcite is used instead of lime in a converter. Background technique [0002] The iron and steel industry is a national basic industry, and the raw materials of the iron and steel industry are mainly non-renewable ores. The main raw material for steelmaking is molten iron, which contains many impurity elements, such as sulfur, phosphorus, etc. In order to remove these harmful impurities, it is necessary to add lime to make slag during the steelmaking process. [0003] Lime is a product calcined from calcium carbonate minerals. Calcium carbonate minerals need to be heated above 1200°C during production, so that calcium carbonate can be decomposed into lime and carbon dioxide. The process of lime production will absorb a lot of heat, and after the lime is burned, it must be cooled to a suitable temperature before it can be transported to the steelmak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36
CPCC21C5/36
Inventor 邱达全李元廷王林王松唐春
Owner SICHUAN DAZHOU IRON & STEEL GROUP