Cel: metale i minera?y zawarte w odpadach powstaj?cych w wyniku dzia?alno?ci górniczej i wydobywczej s? przyczyn? szkód w ?rodowisku. Celem prac eksperymentalnych jest zastosowanie innowacyjnych technologii do obróbki i eksploatacji odpadów wydobywczych w Rumunii, w celu odzyskania wysokiej jako?ci surowców, które zostan? wprowadzone do obrotu, zmniejszaj?c ilo?? deponowanych odpadów. Dalszym celem jest optymalizacja niektórych parametrów zwi?zanych z rozpuszczaniem z?ota i pó?niejsze odzyskiwanie z oczyszczonych roztworów, z okre?leniem technicznej wykonalno?ci schematu procesu opracowanego w skali laboratoryjnej. Metoda: badanie koncentruje si? na procesie hydrometalurgicznym odzyskiwania z?ota. Innowacyjnym sposobem jest zastosowanie do ?ugowania tiosiarczanu, który w porównaniu z tradycyjnym cyjankiem ma wiele zalet, przede wszystkim jest bardziej przyjazny dla ?rodowiska i nietoksyczny dla ludzi. Konwencjonalny proces daje ograniczone wyniki dla badanych odpadów z?otono?nych. Podstawow? zalet? amoniakalnych roztworów tiosiarczanu jest lepsza selektywno?? w stosunku do z?ota, a nie ?ugowanie wszystkich sk?adników mineralnych ska?y p?onnej. Wyniki: wska?niki rozpuszczania z?ota osi?gn??y warto?? 70% Au - w temperaturze pokojowej - w porównaniu do odzysku z procesu konwencjonalnego oko?o 65%. G?ówne wnioski: wyniki s? bardzo zach?caj?ce, proces jest innowacyjny, zastosowany do rudy o niskiej zawarto?ci z?ota. Optymalizacja parametrów i warunków pracy oraz wdro?enie w skali przemys?owej pozwoli osi?gn?? lepsze wyniki pod wzgl?dem wydajno?ci procesu oraz zu?ycia energii i odczynników.
Purpose: the metals and industrial minerals contained in the tailings produced by mining and quarrying activities, are cause of environmental damage. The objective of this experimental work is the application of innovative technologies for the treatment and exploitation of mining tailings in Romania, in order to recover materials high grade raw to be placed on the market, reducing the volume of the wastes. Further objective, is to optimize some parameters relating to the dissolution of gold and the subsequent recovery from purified solutions, determining beforehand the technical feasibility of the scheme of process developed on a laboratory scale. Methods: the study is focused on hydrometallurgical process for the recovery of gold. The innovative treatment chosen is the thiosulphate process that, compared to conventional cyanide, has several advantages, first of all the most eco-friendly and non- toxic to humans. The conventional process shows operating limits in the case of auriferous minerals refractory materials, such as Romanian wastes object of the study. Another fundamental characteristic of the ammoniacal thiosulphate solutions, is the best selectivity towards gold, not attacking the majority of the gangue mineral constituents. Results: the dissolution rates of gold reached a final value of 70% Au - working at room temperature - with recoveries of the global process of about 65%, in line with the conventional process. Main conclusions: these results are very encouraging, considering that this is an innovative process, applied to a low content gold ore. The optimization of parameters and operating conditions, and the industrial treatment, continuous and scale greater would certainly permit to reach the best results in terms of process yields and energetic and reagents consumption.
Valorisation of mining waste for gold recovery
S Ubaldini;D Guglietta;
2018
Abstract
Purpose: the metals and industrial minerals contained in the tailings produced by mining and quarrying activities, are cause of environmental damage. The objective of this experimental work is the application of innovative technologies for the treatment and exploitation of mining tailings in Romania, in order to recover materials high grade raw to be placed on the market, reducing the volume of the wastes. Further objective, is to optimize some parameters relating to the dissolution of gold and the subsequent recovery from purified solutions, determining beforehand the technical feasibility of the scheme of process developed on a laboratory scale. Methods: the study is focused on hydrometallurgical process for the recovery of gold. The innovative treatment chosen is the thiosulphate process that, compared to conventional cyanide, has several advantages, first of all the most eco-friendly and non- toxic to humans. The conventional process shows operating limits in the case of auriferous minerals refractory materials, such as Romanian wastes object of the study. Another fundamental characteristic of the ammoniacal thiosulphate solutions, is the best selectivity towards gold, not attacking the majority of the gangue mineral constituents. Results: the dissolution rates of gold reached a final value of 70% Au - working at room temperature - with recoveries of the global process of about 65%, in line with the conventional process. Main conclusions: these results are very encouraging, considering that this is an innovative process, applied to a low content gold ore. The optimization of parameters and operating conditions, and the industrial treatment, continuous and scale greater would certainly permit to reach the best results in terms of process yields and energetic and reagents consumption.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
