Enhance flotation separation of arsenopyrite and pyrite by low-temperature oxygen plasma surface modification

Enhancement Mechanism of the Difference of Hydrophobicity between Anode and Cathode Active Materials from Spent Lithium-Ion Battery Using Plasma Modification

“…Plasma-enriched free radicals can oxidize the material surface, thus improving the hydrophilicity of the material surface, which has been successfully applied in the manufacturing fields of polymers, building materials, textiles, etc. − In addition, low-temperature plasma-enriched hydroxyl radicals can introduce oxygen-containing functional groups on the polymer surface through the pathway of hydrogen abstraction reaction, thus effectively increasing the difference in the floatability of polyethylene terephthalate and polyvinyl chloride . Plasma pretreatment can be achieved to selectively oxidize the surface of different sulfide ores, thus achieving selective flotation separation of sulfide minerals. − It is also possible to increase the difference in contact angle between pyrite and coal, and thus expand the difference in floatability between the two . The rapid surface oxidation of low-rank coal under the plasma treatment and the sharp increase in hydrophilicity (the contact angle is reduced from 75 to 0°) are conducive to the realization of reverse flotation of low-rank coal and vein minerals. , In addition, the plasma-treated nonpolar oil is rich in nonpolar functional groups, which significantly improves the flotation performance of low-rank coal. , …”

Colloidal ZnCO3 as a Powerful Depressant of Arsenopyrite in Weakly Alkaline Pulp and the Interaction Mechanism

“…Arsenopyrite, the most common arsenic mineral, is usually found in complex sulfide ores [2]. The separation of valuable sulfide minerals, like galena [3,4], chalcopyrite [5], sphalerite [6,7] and pyrite [8,9] from arsenopyrite is very important because arsenic is a penalty element in copper, lead and zinc metal concentrates that are prepared for smelting in the subsequent pyrometallurgical process [10]. The flotation separation of arsenopyrite from the valuable sulfide minerals is still the most relatively effective method compared with gravity and magnetic concentration, which utilizes the difference in the surface wetting properties of different minerals [11].…”

Identificación de sulfuros de arsénico complejos contenidos en una muestra mineral de Fresnillo, Zacatecas y propuesta de disolución de semimetales

“…Estudios anteriores han reportado la oxidación mecano-química de un mineral de arsenopirita a través del uso de peróxido de hidrogeno en un medio acuoso a 50°C, sin embargo, únicamente se reportó la liberación del 9% de hierro y 7% de arsénico tras 120 minutos de reacción [6,7]. En los concentrados multitemáticos obtenidos mediante el proceso de flotación es común detectar la presencia de arsénico relacionado con el mineral de arsenopirita [8,9]. En trabajos previos se ha reportado los mecanismos de depresión del mineral de arsenopirita, al lograr la oxidación del fierro de las partículas de arsenopirita, logrando disminuir la flotabilidad de este mineral que contienen al semimetal [10].…”