Mineral Systems and Thermodynamic Stability of Arsenic …
Arsenic is widely distributed in the environment. The paper presents systematized data published about the thermodynamics of some relatively common arsenic oxysalts, which are formed in the weathering zone of the arsenide and sulfide ores, and determines approaches to quantitative physicochemical modeling of their formation …
Realgar and Orpiment
Orpiment is a monoclinic arsenic sulfide with a yellow-orange color and a chemical composition of As 2 S 3. It has a Mohs hardness of 1-1/2 to 2 and is easily ground into a yellow to yellow-orange powder. Like realgar, its earliest widespread use was as a …
Full article: Stabilization and encapsulation of arsenic-/antimony
1. Arsenic and antimony: Sources and toxicity. Arsenic (As) and antimony (Sb) are trace elements with metalloid properties, showing a wide distribution in the environment (Kabata-Pendias & Mukherjee, Citation 2007).Both are chalcophile elements and usually co-occur in hydrothermal sulfide ores (Johnston et al., Citation …
Arsenic release and transport during oxidative
Arsenic release from sulfide ore is studied in multidimensional experiments. ... Both the sand and the As-sulfide ore (Ward's Science) were dry sieved to obtain a 125–250 µm grain fraction and then cleaned to remove impurities that may be attached to the surface of the grains. The sand was sequentially washed with pH 4, pH 10 and pH 2 ...
Recovery of gold from sulfide refractory gold ore: Oxidation …
In view of this fact, arsenic (As) in the sulfide refractory gold ore can be removed preferentially prior to S by controlling the experimental conditions, such as roasting temperature and air flow rate. The benefit of this is that the formation of As 2 O 5 and FeAsO 4 is avoided and improving the removal efficiency of As. Moreover, it also ...
Full article: The Direct Leaching of Nickel Sulfide Flotation
Sequential flotation is employed to process massive sulfide ore from the Noril'sk-Talnakh deposit in Russia and produce separate copper, ... the processing of ore from the Spotted Quoll mine presents challenges as the ore has a high arsenic content and the arsenic is present as niccolite and gersdorffite (Fewings and Seet Citation 2014; ...
9.2.2: Sulfides and Sulfosalts
Cu-Fe Sulfide Minerals; Metallic ore deposits contain many different sulfide and related ore minerals. Most are quite rare. ... contains the semimetals arsenic and antimony in place of some metal atoms. Because many sulfides have similar atomic arrangements, solid solutions between them are common. The same holds true for the …
Arsenic: its chemistry, its occurrence in the earth and …
Mining: Production and Control of Arsenic
WEBArsenic is commonly found as an impurity in sulfide ores, and is produced commercially for use in pesticides, wood preservatives, metal alloys, and other technologies.
Pool bio-oxidation and fitting analysis of low-grade arsenic …
Gold particles are associated with pyrite and arsenopyrite in the low-grade arsenic-bearing refractory gold ore investigated in this study. In 60 days, the pool bio-oxidation system with aerated, daily bacterial liquid circulation achieved arsenic and sulfur oxidation rates 69% and 41%, respectively, corresponding to an 83% of gold leaching rate.
Beneficiation of an arsenic bearing complex sulphide ore …
In this study beneficiation of a sulphide ore from the Gumushane-Black Sea Region of Turkey was investigated. Detailed flotation studies were carried out with the ore sample which contained 2.95% ...
Enargite | Sulfide Ore, Copper Ore, Arsenic Ore | Britannica
sulfosalt. ore. enargite, sulfosalt mineral, copper arsenic sulfide (Cu 3 AsS 4 ), that is occasionally an important ore of copper. It occurs as heavy, metallic-gray crystals and masses in veins and replacement deposits. Economically valuable deposits have been found in the Balkans; at several places in Peru; Chuquicamata, Chile; and Butte, Mont.
DEVELOPMENT OF A LOW-WASTE TECHNOLOGY FOR …
gold per ton of ore, 0.2% antimony, and 0.3% arsenic was subjected to concentration. The flow chart that was developed for recovering antimony while concentrating the gold-bearing ore (Fig. 1) includes collective flotation of the sulfide minerals and selective flotation to separate the sulfide minerals of antimony – an ti-monite and arsenopyrite.
The application and mechanism of iron sulfides in arsenic …
1. Introduction. Arsenic is a ubiquitous metalloid element, mainly in the form of different compounds in nature. Arsenic compounds can exist in the soil, sediments, and water and have been characterized as group 1 carcinogens by the International Agency for Research on Cancer (IARC) due to their high toxicity [1], [2].The ecotoxicological studies …
Mineral Systems and Thermodynamic Stability of …
The paper presents systematized data published about the thermodynamics of some relatively common arsenic oxysalts, which are formed in the weathering zone …
Extracting antimony from high arsenic and gold-containing stibnite ore
This study investigated the leaching and electrowinning of antimony from a complex, high arsenic and gold-containing stibnite concentrate ore (As-Au-Sb ore) using slurry electrolysis (SE). The results indicated that the leaching efficiency of antimony was higher than 98%, and those of iron and arsenic were about 5.50% and 1.14%, …
Arsenic | Definition, Symbol, Uses, & Facts
History. Arsenic was known in the form of certain of its compounds long before it was clearly recognized as a chemical element. In the 4th century bce Aristotle wrote of a substance called sandarache, …
Flotation concentration of the sulfide antimony-arsenic gold-bearing ore
The technology of concentration of the sulfide antimony-arsenic gold-bearing ore containing 3.6 g/tn Au, 0.3% Sb, and 0.4% As is developed. This technology implies the flotation separation of antimonite and arsenopyrite into separate products and allows them to perform in various cycles, increasing production efficiency due to a …
Chemistry of Arsenic
The most important sulfides of arsenic are realgar, orpiment, and arsenic pentasulfide. Realgar occurs in nature as an arsenic ore. The arsenic trisulfide and pentasulfide are …
Microwave Pyrolysis Pretreatment of High Arsenic …
The process optimization and mechanism of microwave pyrolysis in a nitrogen atmosphere were studied to improve the gold leaching rate for high-arsenic-refractory gold sulfide resources, mainly containing minerals of elemental sulfur, dense pyrite, and arsenopyrite. The decomposability was evaluated using thermodynamic and …
(PDF) The treatment of arsenic bearing ores
For example, enargite is a common copper sulfide ore with high amounts of arsenic. The arsenic can cause environmental problems when the concentrate is processed at a smelter. Hence, due to the ...
Distribution of Arsenic in the Environment
Arsenic ranks twentieth among the elements in abundance in the earth's crust. The abundance of arsenic in the continental crust of the earth is generally given as 1.5–2 ppm. Thus, it is relatively scarce. Nevertheless, it is a major constituent of no fewer than 245 mineral species. Arsenic is found in high concentration in sulfide deposits, where it is …
A Pretreatment of Refractory Gold Ores Containing Sulfide …
The use of thiosulfate to extract gold from refractory ores is promising because of its non-toxicity and high selectivity. Sulfide minerals (i.e., pyrite, arsenopyrite, chalcopyrite), major gold carriers in refractory gold ores, however, hinder gold extraction due to the high consumption of a lixiviant. In this study, a new method to improve gold …
Sulfide Mineral
Thiosulfate as an Alternative Lixiviant to Cyanide for Gold Ores. M.G. Aylmore, in Gold Ore Processing (Second Edition), 2016 4.2.1 Sulfide Dissolution. Sulfide minerals such as arsenopyrite, pyrrhotite, and pyrite can also be partially leached in ammoniacal thiosulfate (Feng and van Deventer, 2002a; Xia and Yen, 2005; Xia, 2008) and under these …
Mining: Production and Control of Arsenic
Arsenic is a naturally occurring element commonly found as an impurity in sulfide-bearing mineral ores and volcanic rocks. Arsenic is widely distributed in rocks, soil, natural waters, and in small amounts in most living things. Arsenic is a critical mineral for a variety of uses, especially in gallium-arsenide semiconductors for solar cells ...
Understanding Stress Response to High-Arsenic Gold-Bearing Sulfide …
The sulfide concentrate used in this study was characterized by a high content of As (19.1 wt%), as well as the presence of Zn, which also contributed to the toxic effect on the bacterial cells. During biooxidation of the sulfide ore concentrate, ferrous iron, arsenic, and zinc were gradually released from the solids into the medium (Table 1).
Natural and synthetic arsenic sulfide pigments in
The authors cite the earliest known reference to artificial arsenic sulfide production in Japan, dating to 1846, where Takamatsu describes heating arsenical ore with sulfur to produce a yellow pigment . Prior to 1846, the source and production of artificial arsenic sulfide pigments and their use in Japanese woodblock prints has not been …
Arsenic: its chemistry, its occurrence in the earth and its …
Arsenic is widespread in the environment where it occurs combined with metals and sulfur and as secondary minerals in combination with oxygen. Its atomic structure allows it to be trivalent or pentavalent, and its properties lead to its classification as a metalloid in the periodic classification of the elements. Arsenic trioxide is a by-product …
The Technological Basis for Extraction of Arsenic …
Arsenic is extracted from sulfide ores [ 3 – 6] via oxidative annealing with subsequent reduction of its oxide, if commercial arsenic is required as a final product, or …
Recovery of gold from sulfide refractory gold ore: Oxidation …
For high arsenic sulfide gold ore, a sufficient sulfur source (addition of pyrite or sulfur) could be supplemented, and then thermal activation pretreatment for thiosulfate generation. This alternative technology can prevent the volatilization of hazardous gases (SO 2 and As 2 O 3) and instead collect them as less harmful solids (S 8 and As 2 S ...
A clean and efficient innovative technology for refractory sulfide …
For high arsenic sulfide gold ore, a sufficient sulfur source (addition of pyrite or sulfur) could be supplemented, and then thermal activation pretreatment for thiosulfate generation. This alternative technology can prevent the volatilization of hazardous gases (SO 2 and As 2 O 3) and instead collect them as less harmful solids (S …
