Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
126 words
A method of determining when a molten-metal bath in a particular top blown oxygen converter contains a predetermined amount of carbon as set forth in claim 1 in which the carbon content of the molten-metal bath at the time there is a simultaneous and continuous increase in the amount of unreacted oxygen and decrease in the amount of carbon dioxide expressed as CPC is determined from the relationship CPC CF+CWG where CF is the total carbon content of the molten-metal bath after the conversion process is terminated and CWG is the summation of the carbon removed from the molten-metal bath after the simultaneous and continuous increase in the amount of unreacted oxygen and decrease in the amount of carbon dioxide in the waste gas has occurred.
Claim 2
Independent Claim
292 words
A method for controlling the carbon content of a molten-metal bath in a top blown oxygen converter comprising, a. feeding oxygen to a converter containing a molten-metal bath at a preselected rate, b. measuring the amount of unreacted oxygen in the waste gas, c. measuring the amount of carbon dioxide in the waste gas, d. determining the time the phase change occurs in the carbon oxygen reaction by noting the time when a simultaneous and continuous increase in the amount of unreacted oxygen and a continuous decrease in the amount of carbon dioxide in the waste gas occurs, e. determining the carbon content of the molten-metal bath at the time the phase change occurs in the carbon reaction from the previous metal conversions in the same converter by measuring in the previous metal conversions the total amount of carbon removed from the molten-metal bath from the time the phase change occurs until the conversion process is terminated, determining the total carbon content of the molten-metal bath in the same previous metal conversions after the conversion process is terminated and determining from the carbon content values the carbon content of the molten-metal bath at the time during the conversion process that the phase change occurred, f. feeding oxygen to the converter to remove additional carbon from the molten-metal bath, g. continuously summating from the waste gases the amount of carbon removed from the molten-metal bath after the phase change occurs, h. continuoUsly reducing the amount of carbon present in the molten-metal bath at the time the phase change occurred by the summated amount of carbon removed from the molten-metal bath after the phase change occurred, and i. terminating the conversion process when the carbon content of the molten-metal bath reaches a preselected value.
Claim 3
Dependent Claim
97 words
A method for controlling the carbon content of a molten-metal bath in a top blown oxygen converter as set forth in claim 3 which includes, determining the volume of oxygen required to react with the carbon in the molten metal after the phase change occurs to remove a predetermined amount of carbon from the molten-metal bath and reduce the carbon content to a preselected value, feeding said predetermined volume of oxygen to the converter to remove said predetermined amount of carbon, and terminating the conversion process after said volume of oxygen has been delivered to said converter.
Claim 4
Dependent Claim
80 words
A method for controlling the carbon content of a molten-metal bath as set forth in claim 3 which includes, a. measuring the amount of unreacted oxygen in the waste gas, b. measuring the amount of carbon dioxide in the waste gas, and c. determining the time the phase change occurs in the carbon-oxygen reaction by noting the time the difference between the amount of unreacted oxygen and the amount of carbon dioxide in the waste gas increases substantially and continuously.
Claim 5
Dependent Claim
34 words
A method for controlling the carbon content of a molten-metal bath as set forth in claim 3 which includes, measuring the amount of carbon removed from the molten-metal bath after the phase change occurs.
Claim 6
Dependent Claim
55 words
A method for controlling the carbon content of a molten-metal bath in a top blown oxygen converter as set forth in claim 3 which includes, initiating the measurement of the amount of unreacted oxygen and the amount of carbon dioxide in the waste gas after the conversion process has progressed a preselected period of time.
Claim 7
Dependent Claim
39 words
A method for controlling the carbon content of a molten-metal bath in a top blown oxygen converter as set forth in claim 3 which includes, terminating the conversion process when the molten metal bath contains below 0.30 percent carbon.