Method for measuring capacity of alkalis boiler slag potassium contained in blast furnace using gas-slag balancing technique

A balanced and technical technology, applied in the field of physical and chemical testing, which can solve the problems of increasing the complexity and difficulty of high-temperature experiments of potassium capacity, and volatile alkali vapor.

Inactive Publication Date: 2008-10-01
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for alkali-containing slag, the complexity and difficulty of high-temperature experiments on potassium capacity are increased due to the volatilization of alkali vapor.

Method used

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  • Method for measuring capacity of alkalis boiler slag potassium contained in blast furnace using gas-slag balancing technique
  • Method for measuring capacity of alkalis boiler slag potassium contained in blast furnace using gas-slag balancing technique
  • Method for measuring capacity of alkalis boiler slag potassium contained in blast furnace using gas-slag balancing technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0055] Example 2: CaO and SiO that have been calcined at 950°C for 13 hours 2 、Al 2 o 3 , MgO, ZnO, TiO 2 Oxides, according to the mass ratio of 42.1%, 39.62%, 9.22%, 8.44%, 0.02%, 0.6%, are mixed and put into a graphite crucible, mixed and melted at 1450°C, fully stirred, taken out, cooled, crushed and mixed evenly to form CaO-SiO 2 -Al 2 o 3 -MgO-ZnO-TiO 2 The slag sample is reserved. Weigh 55 grams of potassium carbonate reagent and put it into the corundum crucible at the lower part of the corundum tube. in a platinum crucible. Ar is introduced from the bottom of the corundum tube to remove the air in the corundum tube and then the temperature rises. When the furnace temperature rises to 1425°C, a certain composition of CO and CO after purification is introduced. 2 , Ar mixed gas, the flow ratio is 100ml / min: 100ml / min: 200ml / min, at a constant temperature of 1425°C and start timing, after 5 hours the equilibrium reaction is completed, and the chemical analysis sa...

Embodiment 3

[0056] Example 3: CaO and SiO that have been calcined at 1000°C for 12 hours 2 、Al 2 o 3 , MgO, ZnO, TiO 2 Oxide, according to the ratio of 33.3%, 40.5%, 13.11%, 12.36%, 0.03%, 0.7%, mixed and put into a graphite crucible, mixed and melted at 1400 ° C, fully stirred and taken out, cooled, crushed and mixed evenly to form CaO -SiO 2 -Al 2 o 3 -MgO-ZnO-TiO 2 The slag sample is reserved. Weigh 60 grams of potassium carbonate reagent and put it into the corundum crucible at the lower part of the corundum tube. in a platinum crucible. Ar is introduced from the bottom of the corundum tube to remove the air in the corundum tube and then the temperature rises. When the temperature of the furnace rises to 1450 ° C, a certain composition of CO and CO after purification is introduced. 2 , Ar mixed gas, the flow ratio is 100ml / min: 100ml / min: 200ml / min, at a constant temperature of 1450°C and start timing, after 4 hours, the equilibrium reaction is completed, and the chemical ana...

Embodiment 4

[0057] Example 4: CaO and SiO that have been calcined at 960°C for 13 hours 2 、Al 2 o 3 , MgO, ZnO, TiO 2 Oxides, according to the mass ratio of 42.1%, 27.7%, 14.28%, 15.0%, 0.02%, 0.9%, are mixed and put into a graphite crucible, mixed and melted at 1450°C, fully stirred, taken out, cooled, crushed and mixed evenly to form CaO-SiO 2 -Al 2 o 3 -MgO-ZnO-TiO 2 The slag sample is reserved. Weigh 55 grams of potassium carbonate reagent and put it into the corundum crucible at the lower part of the corundum tube. in a platinum crucible. Ar is introduced from the bottom of the corundum tube to remove the air in the corundum tube and then the temperature rises. When the furnace temperature rises to 1425°C, a certain composition of CO and CO after purification is introduced. 2 , Ar mixed gas, the flow ratio is 100ml / min: 100ml / min: 200ml / min, at a constant temperature of 1425°C and start timing, after 5 hours the equilibrium reaction is completed, and the chemical analysis sa...

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Abstract

A method for measuring the potassium content of the alkali-containing slag with a gas-slag balancing technique belongs to a technique field of a physical and chemical experiment. The method is used for settling the problem that the complexity and difficulty of the potassium capability high-temperature experiment is increased because of the specificity of K2O in the slag. The technical scheme is composed of the procedures of preparing slag specimen, setting the arranging position of slag specimen and potassium carbonate agent in the corundum tube of the high temperature furnace, balanced reacting, measuring the content of potassium and the like. The invention adopts the gas-slag balancing technique. A platinum crucible is used as a gas-slag reaction vessel. A corundum crucible is used as a generation container of the potassium steam. The mixed gas of CO-CO2-Ar is used for control a certain partial pressure of oxygen in the system. The potassium carbonate decomposes to control the partial pressure of potassium in the system. The potassium capability of furnace slag CaO-SiO2-Al2O3-ZnO-TiO2 under different conditions is measured in MoSi2 high-temperature resistor furnace. The invention has the advantages of easy method, good repeatability, accurate measurement to the potassium content of alkali-containing furnace slag, and accurate data provided to the content of base metal in the furnace.

Description

technical field [0001] The invention relates to a method for measuring the potassium capacity of alkali-containing slag of a blast furnace by using a gas-slag balance technology, belonging to the technical field of physical and chemical testing. Background technique [0002] Alkali metal potassium has an important influence on blast furnace smelting. Potassium is a very active element and is easily oxidized. It appears in the form of complex compounds and is widely distributed in nature. It often exists in the form of complex aluminosilicates. Various ores, such as orthoclase (K 2 al 2 Si 6 o 16 ), leucite (K 2 al 2 Si 4 o 12 ), Mica (KH 2 al 2 SiO 12 )Wait. The content of potassium in iron ore is not much, but it is not easy to remove it through the general beneficiation process; it is also rarely removed in the conventional sintering and pelletizing process. Therefore, alkali metals always enter the blast furnace more or less unavoidably. With the development ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/00G01N1/38
Inventor 吕庆王书桓李福民张淑会刘增勋亢立明马明鑫李明王婷婷
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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