In this paper, the separation of arsenopyrite from chalcopyrite, pyrite, galena with organic depressants （guergum and sodium humic ） was discussed, and the functioning mechanism of those organic depressants was disc...In this paper, the separation of arsenopyrite from chalcopyrite, pyrite, galena with organic depressants （guergum and sodium humic ） was discussed, and the functioning mechanism of those organic depressants was discussed. The experimental results of monomineral flotation indicated that both guergum and sodium humic have depressing effect on arsenopyrite in the presence of ethyl xanthate. Guergum and sodium humic showed different depressing ability to pyrite, chalcopyrite and galena, and the higher the pH value in pulp, the stronger the depressing ability. Ultraviolet-Visible Spectrophotometric study showed that the adsorption layer of xanthate on surface of minerals had been desorhed by the two organic depressants, and the selective desorption of the collector layer was found from different minerals. The xanthate cover on minerals surface was set free when dosage of the organic depressants was high enough. For artificially-mixed minerals, the separation of arsenopyrite from other sulphides was successfully realized by controlling dosage of the organic depressants. And sodium humic had been concentrates in a commercial Lead-Zinc concentrator.展开更多
The research was done at Havana Biofabric, Mayabeque Province. The vitro plants of banana （Musa sp） used came from the clone Enano Guantanamero （viand type）. They come from multiplication phase in a Murashige and ...The research was done at Havana Biofabric, Mayabeque Province. The vitro plants of banana （Musa sp） used came from the clone Enano Guantanamero （viand type）. They come from multiplication phase in a Murashige and MS （Skoog medium）. The objective of this work was to study the potentialities of HA （humic acids） for stimulation of rooting and cell division process, searching for completely synthetic hormone substitution due to its high cost. The multiplication medium contained thiamine （2 mg·L^-1）, myo-inositol （100 mg·L^-1）, sugar （30mg·L^-1）. By the use of HA, five treatments were used with total substitution of auxin and cytokinin （TI： HA （10 mg.Ll）; （T2： HA （20 mg·L^-1）; （T3： HA （30mg·L^-1）; （T4： HA （40 mg·L^-1）; （T5： HA （50 mg·L^-1） and the control with 6BAP （benzil amino purine） （4 mg·L^-1） ＋ IBA （indol butyric acid） （0.65 mg·L^-1）, pH of the medium was adjust just before agar were add. The results showed that in the explants under HA treatments, elongation and cell multiplication were favored confirmed by explants great high, root number and length due to dry mass. The total protein content, reduced carbohydrate and peroxidases enzymatic activity were determine. The use of Vermicompost HA in the in vitro micropropagation of banana allow the elimination of rooting phase saving materials and be able to pass explants directly to Acclimatization phase.展开更多
文摘In this paper, the separation of arsenopyrite from chalcopyrite, pyrite, galena with organic depressants （guergum and sodium humic ） was discussed, and the functioning mechanism of those organic depressants was discussed. The experimental results of monomineral flotation indicated that both guergum and sodium humic have depressing effect on arsenopyrite in the presence of ethyl xanthate. Guergum and sodium humic showed different depressing ability to pyrite, chalcopyrite and galena, and the higher the pH value in pulp, the stronger the depressing ability. Ultraviolet-Visible Spectrophotometric study showed that the adsorption layer of xanthate on surface of minerals had been desorhed by the two organic depressants, and the selective desorption of the collector layer was found from different minerals. The xanthate cover on minerals surface was set free when dosage of the organic depressants was high enough. For artificially-mixed minerals, the separation of arsenopyrite from other sulphides was successfully realized by controlling dosage of the organic depressants. And sodium humic had been concentrates in a commercial Lead-Zinc concentrator.
文摘The research was done at Havana Biofabric, Mayabeque Province. The vitro plants of banana （Musa sp） used came from the clone Enano Guantanamero （viand type）. They come from multiplication phase in a Murashige and MS （Skoog medium）. The objective of this work was to study the potentialities of HA （humic acids） for stimulation of rooting and cell division process, searching for completely synthetic hormone substitution due to its high cost. The multiplication medium contained thiamine （2 mg·L^-1）, myo-inositol （100 mg·L^-1）, sugar （30mg·L^-1）. By the use of HA, five treatments were used with total substitution of auxin and cytokinin （TI： HA （10 mg.Ll）; （T2： HA （20 mg·L^-1）; （T3： HA （30mg·L^-1）; （T4： HA （40 mg·L^-1）; （T5： HA （50 mg·L^-1） and the control with 6BAP （benzil amino purine） （4 mg·L^-1） ＋ IBA （indol butyric acid） （0.65 mg·L^-1）, pH of the medium was adjust just before agar were add. The results showed that in the explants under HA treatments, elongation and cell multiplication were favored confirmed by explants great high, root number and length due to dry mass. The total protein content, reduced carbohydrate and peroxidases enzymatic activity were determine. The use of Vermicompost HA in the in vitro micropropagation of banana allow the elimination of rooting phase saving materials and be able to pass explants directly to Acclimatization phase.
