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Blast Furnace Gas Washer Removes Cyanides, Ammonia, Iron and Phenol ROGER A. DECAIGNY, Works Metallurgist FRED G. KRIKAU, Engineer Interlake Steel Corporation Riverdale, Illinois INTRODUCTION Basic to the iron and steel industry is the blast furnace which converts iron ore into molten iron and is the beginning of the process in the manufacturing of steel. During the operation of a blast furnace, great quantities of gas are generated. This gas, being rich in carbon monoxide, is used further in the steel making process as a source of fuel. Gases leaving the blast furnace are contaminated with very fine particles of dust and other contaminets which must be removed, not only to allow the gas to be used as a fuel, but to prevent air pollution. The gas is cleaned by high-energy scrubbers, which use water in great quantities as the cleaning media. BLAST FURNACE GAS CLEANING SYSTEM A typical blast furnace gas cleaning system is currently utilized by most steel producers. Water is pumped out of a nearby river or stream, through the gas scrubber and gas cooler, and then into a clarifier. These clarifiers or thickeners do a fair job of removing the flue dust, but, in order to meet today's water pollution laws this system is no longer good enough. The water, after passing through the clarifier, is simply dumped back to the river. Because the raw materials fed to a blast furnace contain such things as iron ore, limestone, and coke, blast furnace gas contains quantities of ammonia, phenol, and cyanide. The waters used in the gas scrubbers and gas coolers absorb these compounds which become part of the dissolved solids content of the water. Table I is a typical analysis of the waters coming from the gas scrubbers, the gas cooler and the water that is returned to the river. Using this information, Interlake began to study the methods available to further treat this water before it was returned to the river. We evaluated such systems as chlorine additives at controlled pH to disassociate the cyanide. We evaluated bacteria systems to assimilate the ammonia and phenol. It became apparent during this evaluation that, since we were required to clean the water to such a high extent, it would be foolish to discharge it back to the river. For this reason, we felt that a system for recycling the clarifier effluent back to the gas cleaning system would provide the best means for alleviating the effluent problem. A number of plants were using such recycling systems and operating information was collected from as many as possible. A wide variety of results were reported, and it generally appeared that systems had been put into operation and then made to work under conditions peculiar to each individual installation. A number of questions basic to the procedure remained unanswered. -512-
Object Description
Purdue Identification Number | ETRIWC197052 |
Title | Blast furnace gas washer removes cyanides, ammonia, iron and phenol |
Author |
Decaigny, Roger A. Krikau, F. G. (Fred G.) |
Date of Original | 1970 |
Conference Title | Proceedings of the 25th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,18196 |
Extent of Original | p. 512-517 |
Series | Engineering extension series no. 137 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Date Digitized | 2009-06-09 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page512 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | Blast Furnace Gas Washer Removes Cyanides, Ammonia, Iron and Phenol ROGER A. DECAIGNY, Works Metallurgist FRED G. KRIKAU, Engineer Interlake Steel Corporation Riverdale, Illinois INTRODUCTION Basic to the iron and steel industry is the blast furnace which converts iron ore into molten iron and is the beginning of the process in the manufacturing of steel. During the operation of a blast furnace, great quantities of gas are generated. This gas, being rich in carbon monoxide, is used further in the steel making process as a source of fuel. Gases leaving the blast furnace are contaminated with very fine particles of dust and other contaminets which must be removed, not only to allow the gas to be used as a fuel, but to prevent air pollution. The gas is cleaned by high-energy scrubbers, which use water in great quantities as the cleaning media. BLAST FURNACE GAS CLEANING SYSTEM A typical blast furnace gas cleaning system is currently utilized by most steel producers. Water is pumped out of a nearby river or stream, through the gas scrubber and gas cooler, and then into a clarifier. These clarifiers or thickeners do a fair job of removing the flue dust, but, in order to meet today's water pollution laws this system is no longer good enough. The water, after passing through the clarifier, is simply dumped back to the river. Because the raw materials fed to a blast furnace contain such things as iron ore, limestone, and coke, blast furnace gas contains quantities of ammonia, phenol, and cyanide. The waters used in the gas scrubbers and gas coolers absorb these compounds which become part of the dissolved solids content of the water. Table I is a typical analysis of the waters coming from the gas scrubbers, the gas cooler and the water that is returned to the river. Using this information, Interlake began to study the methods available to further treat this water before it was returned to the river. We evaluated such systems as chlorine additives at controlled pH to disassociate the cyanide. We evaluated bacteria systems to assimilate the ammonia and phenol. It became apparent during this evaluation that, since we were required to clean the water to such a high extent, it would be foolish to discharge it back to the river. For this reason, we felt that a system for recycling the clarifier effluent back to the gas cleaning system would provide the best means for alleviating the effluent problem. A number of plants were using such recycling systems and operating information was collected from as many as possible. A wide variety of results were reported, and it generally appeared that systems had been put into operation and then made to work under conditions peculiar to each individual installation. A number of questions basic to the procedure remained unanswered. -512- |
Resolution | 300 ppi |
Color Depth | 8 bit |
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