A Method for Evaluating the Comprehensive Alkali Removal and Desulfurization Ability of Blast Furnace Slag

A blast furnace slag and capacity technology, applied in the field of metallurgical physical and chemical testing, can solve the problems of unstudied slag alkali discharge, desulfurization thermodynamic parameters, inaccurate thermodynamic conditions, poor applicability of research results, etc., and achieve the effect of simple method and good reproducibility

Inactive Publication Date: 2011-12-14
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still the following problems in the research on alkali removal and desulfurization of blast furnace slag: 1) Potassium capacity and sulfur capacity are used to separately evaluate the alkali removal and desulfurization capabilities of slag. Study the relationship between the two mutually restrictive thermodynamic parameters of slag alkali removal and desulfurization
It is not accurate enough to evaluate the comprehensive alkali discharge and desulfurization capacity of slag and to determine the optimal thermodynamic conditions; 2) For the research on the alkali discharge capacity of blast furnace, most of the research is not carried out under equilibrium conditions, and the influence of temperature and atmosphere is not considered. The evaluation of alkali drainage ability is not comprehensive, and the applicability of the research results is poor

Method used

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  • A Method for Evaluating the Comprehensive Alkali Removal and Desulfurization Ability of Blast Furnace Slag
  • A Method for Evaluating the Comprehensive Alkali Removal and Desulfurization Ability of Blast Furnace Slag
  • A Method for Evaluating the Comprehensive Alkali Removal and Desulfurization Ability of Blast Furnace Slag

Examples

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Embodiment 1

[0057] Example 1: Take CaO and SiO that have been calcined at 1100°C for 12 hours 2 、Al 2 o 3 , MgO, TiO 2 Chemical reagents are mixed according to the mass ratio of 32.3%, 34.78%, 15.44%, 16.8%, and 0.68%, and then put into a graphite crucible, mixed and melted at 1500°C, fully stirred, taken out, cooled, and crushed to make a slag sample for later use. Weigh 60 grams of potassium carbonate and put it into a corundum crucible, place the crucible at a temperature of 1350°C in a high-temperature furnace; take another 40 grams of slag prepared in the first step and place it in a platinum crucible, which is located at the porous height of the corundum crucible Aluminum refractory bricks, so that the corundum crucible is in the constant temperature zone of the high temperature furnace. When the furnace temperature rises to 1000°C, Ar is introduced from the bottom of the corundum tube to remove the air in the corundum tube. When the furnace temperature rises to 1500°C, the purif...

Embodiment 2

[0058] Example 2: Take CaO and SiO that have been calcined at 1100°C for 12 hours 2 、Al 2 o 3 , MgO, TiO 2 The chemical reagents are mixed according to the mass ratio of 42.3%, 34.33%, 15.44%, 7.25%, and 0.68%, and then put into a graphite crucible, mixed and melted at 1500°C, fully stirred, taken out, cooled, and crushed to make a slag sample for later use. Weigh 60 grams of potassium carbonate and put it into a corundum crucible, place the crucible at a temperature of 1350°C in a high-temperature furnace; take another 40 grams of slag prepared in the first step and place it in a platinum crucible, which is located at the porous height of the corundum crucible Aluminum refractory bricks, so that the corundum crucible is in the constant temperature zone of the high temperature furnace. When the furnace temperature rises to 1000°C, Ar is introduced from the bottom of the corundum tube to remove the air in the corundum tube. When the furnace temperature rises to 1500°C, the p...

Embodiment 3

[0059] Example 3: Take CaO and SiO that have been calcined at 1100°C for 12 hours 2 、Al 2 o 3 , MgO, TiO 2 Chemical reagents are mixed according to the mass ratio of 38.20%, 34.86%, 15.44%, 10.82%, and 0.68%, and then put into a graphite crucible, mixed and melted at 1500°C, fully stirred, taken out, cooled, and crushed to make a slag sample for later use. Weigh 60 grams of potassium carbonate and put it into a corundum crucible, place the crucible at a temperature of 1350°C in a high-temperature furnace; take another 40 grams of slag prepared in the first step and place it in a platinum crucible, which is located at the porous height of the corundum crucible Aluminum refractory bricks, so that the corundum crucible is in the constant temperature zone of the high temperature furnace. When the furnace temperature rises to 1000°C, Ar is introduced from the bottom of the corundum tube to remove the air in the corundum tube. When the furnace temperature rises to 1410°C, the pur...

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Abstract

A method for evaluating a comprehensive alkali-removing and desulfuration capacity of blast furnace slag. The method is utilized for solving a problem that a comprehensive alkali-removing and desulfuration capacity of blast furnace slag is evaluated through a potassium sulfide capability. The method comprises the following steps of preparing a slag sample, setting positions of a potassium carbonate reagent and the slag sample in a corundum tube of a high temperature furnace, carrying out a slag sample process, determining a potassium sulfide capability and evaluating a comprehensive alkali-removing and desulfuration capacity of blast furnace slag. Aiming at solving a problem that thermodynamic conditions of blast furnace desulfuration are conflicting with thermodynamic conditions of blastfurnace alkali-removing, the method brings forward a way for determining a potassium sulfide capability of blast furnace slag by a gas-slag equilibrium technology and can evaluate a comprehensive alkali-removing and desulfuration capacity of blast furnace slag according to a potassium sulfide capability, and thus appropriate thermodynamic conditions satisfying both alkali-removing and desulfuration are obtained. The method is simple and convenient, has good repeatability and can provide basic data for formulating of a reasonable operation system suitable for a blast furnace. Through the method, a blast furnace can produce eligible molten iron and keep the greatest alkali-removing capacity simultaneously, and under the conditions of high alkali load and low-slag smelting, damages of alkalimetals on the blast furnace are reduced.

Description

technical field [0001] The invention relates to a method for evaluating the comprehensive alkali removal and desulfurization capabilities of blast furnace slag, which belongs to the technical field of metallurgical physical and chemical testing. Background technique [0002] Since the 1970s, metallurgists have gradually deepened their understanding of the hazards of alkali metals to blast furnace production and accumulated a lot of valuable experience. The commonly used measures to reduce the hazards of blast furnace alkali metals are: control the blast furnace alkali load through ore blending; regularly wash the grate alkali; reduce the hearth temperature and slag alkalinity; increase the amount of slag. In recent years, due to changes in production conditions, alkali metal hazards have become one of the main problems affecting the normal production of most blast furnaces. The original theory can no longer solve the problem of alkali metal hazards emerging in blast fur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/00G01N21/31G01N31/12
Inventor 李福民吕庆李建朝张淑会刘增勋刘然孙艳芹欧阳坤孔延厂
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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