A brief account is given to the principle of delayed fission neutron method and the related equipments for the determination of uranium in minerals by this method. The whole experimental procedure was autoprogramatica...A brief account is given to the principle of delayed fission neutron method and the related equipments for the determination of uranium in minerals by this method. The whole experimental procedure was autoprogramatically controlled. The neutron flux was monitored and delayed fission neutrons were measured in a multiscale mode by multichannel analyser. The method has the advantage of relative simplicity, quick performance, high accuracy, non-destructlon and low cost. Its standard deviation is ±0.2% and sensitivity 388 n/μg U. The comparison shows that the results obtained by this method are in good agreement with those by other methods. Finally, the problem of interference in measurement is discussed, too.展开更多
The presented results are related to the leaching of Pb-Zn-Cu-Fe sulphide concentrate, obtained from barite-sulphide ores, under the elevated temperatures and pressures in an autoclave. The leaching process was perfor...The presented results are related to the leaching of Pb-Zn-Cu-Fe sulphide concentrate, obtained from barite-sulphide ores, under the elevated temperatures and pressures in an autoclave. The leaching process was performed using the sulphur acid solution with the oxygen addition for the separation of the targeted metals from the polymetallic concentrate. In this process influences of various parameters were discussed and then correlated to the leached metals, zinc, copper and iron. Zinc, copper and iron were dissolved in a solution, while lead remained as insoluble in the leach residue. The best leaching results were determined under the temperature of 210 ℃ during the 240 min. Obtained leaching degrees were 98% zinc, 95% copper and 96% iron.展开更多
文摘A brief account is given to the principle of delayed fission neutron method and the related equipments for the determination of uranium in minerals by this method. The whole experimental procedure was autoprogramatically controlled. The neutron flux was monitored and delayed fission neutrons were measured in a multiscale mode by multichannel analyser. The method has the advantage of relative simplicity, quick performance, high accuracy, non-destructlon and low cost. Its standard deviation is ±0.2% and sensitivity 388 n/μg U. The comparison shows that the results obtained by this method are in good agreement with those by other methods. Finally, the problem of interference in measurement is discussed, too.
文摘The presented results are related to the leaching of Pb-Zn-Cu-Fe sulphide concentrate, obtained from barite-sulphide ores, under the elevated temperatures and pressures in an autoclave. The leaching process was performed using the sulphur acid solution with the oxygen addition for the separation of the targeted metals from the polymetallic concentrate. In this process influences of various parameters were discussed and then correlated to the leached metals, zinc, copper and iron. Zinc, copper and iron were dissolved in a solution, while lead remained as insoluble in the leach residue. The best leaching results were determined under the temperature of 210 ℃ during the 240 min. Obtained leaching degrees were 98% zinc, 95% copper and 96% iron.
