scholarly journals Gold recovery from flotation concentrate from gold mine tailings using dissolve smelting

2019 ◽  
Vol 55 (3) ◽  
pp. 343-349
Author(s):  
U. Erdenebold ◽  
C.-M. Sung ◽  
J.-P. Wang
Keyword(s):  
Molten Slag ◽  
Precious Metals ◽  
Copper Slag ◽  
Molten Copper ◽  
Flotation Concentrate ◽  
Sulphide Minerals ◽  
Oxidative Roasting ◽  
Valuable Metals ◽  
Gold Mine Tailings ◽  
High Concentrations

Gold flotation concentrate may contain relatively high concentrations of valuable metals such as iron, copper, and zinc, and occasionally, even precious metals such as gold. The major components of the concentrate are SiO2, Fe2O3, and Al2O3, but it also contains reactive sulphide minerals such as pyrite. The sulphides in the flotation concentrate are fully converted into an oxide form during oxidative roasting, therefore, the chemical composition of the roasted concentrate is considered to be a copper slag. High temperature smelting with additives to dissolve Au from the gold concentrate into a molten copper was used in the research. Gold greatly dissolved at 1600?? under a CaO/SiO2 ratio of 1.25, suggesting the increase in the dissolution of gold into molten copper with decreasing viscosity of the molten slag-like concentrate at high temperatures.

scholarly journals Environmental and Socioeconomic Impact of Copper Slag—A Review

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1504
Author(s):  
Tlotlo Solomon Gabasiane ◽  
Gwiranai Danha ◽  
Tirivaviri A. Mamvura ◽  
Tebogo Mashifana ◽  
Godfrey Dzinomwa
Keyword(s):  
Direct Reduction ◽  
Precious Metals ◽  
Copper Slag ◽  
Secondary Source ◽  
Socioeconomic Impacts ◽  
Physical Separation ◽  
Valuable Metals ◽  
Nickel Ores ◽  
Land Space

Copper slag is generated when copper and nickel ores are recovered from their parent ores using a pyrometallurgical process, and these ores usually contain other elements which include iron, cobalt, silica, and alumina. Slag is a major problem in the metallurgical industries as it is dumped into heaps which have accumulated into millions of tons over the years. Moreover, they pose a danger to the environment as they occupy vacant land (space problems). Over the past few years, studies have been conducted to investigate the copper slag-producing outlets to learn their behavior, as well as properties of slag, to have the knowledge of how to better reuse and recycle copper slag. This review article provides the environmental and socioeconomic impacts of slag, as well as a characterization of copper slag, with the aim of reusing and recycling the slag to benefit the environment and economy. Recycling methods are considered an attractive technological pathway for reducing waste and greenhouse gas emissions, as well as promoting the concept of circular economy through the utilization of waste. These metal elements have value depending on their characteristics; hence, copper slag is considered as a secondary source of valuable metals. Some of the pyrometallurgical and hydrometallurgical processes to consider are physical separation, magnetic separation, flotation, leaching, and direct reduction roasting of iron (DRI). Some of the possible metals that can be recovered from the copper slag include Cu, Fe, Ni, Co, and Ag (precious metals).

Mineral deposits and chalcogen gases

1993 ◽  
Vol 57 (389) ◽  
pp. 599-606 ◽  
Author(s):  
Martin Hale
Keyword(s):  
Ore Deposits ◽  
Anomalous Dispersion ◽  
Mineral Deposits ◽  
Oxidation Reactions ◽  
Sulphide Minerals ◽  
Sulphide Ore ◽  
Dispersion Patterns ◽  
Sulphide Deposits ◽  
High Concentrations ◽  
And Migration

AbstractSulphide minerals and their analogues yield gases as a result of oxidation reactions. Even where sulphide minerals are in contact with mildly reducing groundwaters, S2- ions pass into solution and their dispersion patterns can be detected in soil as acid-released H2S. In more oxidising conditions, the metastable gases COS and CS2 are generated. Anomalous dispersion patterns of COS have been reported in soils above more than ten sulphide ore deposits, many of them concealed beneath transported exotic overburden. High concentrations of CS2 occur in the soils over several of the same deposits and uniquely reflect others. Anomalies of SO2 over sulphide deposits are confined to arid terrains. Certain anomalous dispersion patterns of arsenic and tellurium in soils are attributed to the generation and migration of unspecified gases from the oxidation of arsenide and telluride minerals.

Efficiency improvements of the CO-H2 mixed gas utilization related to the molten copper slag reducing modification

2021 ◽  
Vol 146 ◽  
pp. 292-299
Author(s):  
Huaiwei Zhang ◽  
Liang Bao ◽  
Yifan Chen ◽  
Weidong Xuan ◽  
Yongjun Yuan
Keyword(s):  
Copper Slag ◽  
Molten Copper ◽  
Mixed Gas ◽  
Gas Utilization

On genesis of massive sulfide polymetallic ore deposits of Rudny Altai

2021 ◽  
pp. 3-16
Author(s):  
B. DIYACHKOV ◽  
M. MIZERNAYA ◽  
A. PYATKOVA ◽  
A. BISATOVA ◽  
A. MIROSHNIKOVA ◽  
...  
Keyword(s):  
Precious Metals ◽  
Massive Sulfide ◽  
Ore Deposits ◽  
Vertical Range ◽  
Long Duration ◽  
Ore Minerals ◽  
Ore Mineralization ◽  
High Concentrations ◽  
Individual Grains ◽  
Polymetallic Ore

Many geologists assign most of large- and medium-sized massive sulfide polymetallic ore deposits of Eastern Kazakhstan to the VMS type. These ore deposits formed in the Devonian, under conditions of rifting and active basalt-andesite-rhyolite volcanism. Ore bodies of these deposits are noted to be clearly confined to formations of several geochronologic levels (D1e to D3fm). Hydrothermal-sedimentary syngenetic and hydrothermal-metasomatic ores are distinguished. High concentrations of base metals in the ores (above 10 % sum metals) and their rather simple mineral composition (chalcopyrite, pyrite, galena, and sphalerite) are a characteristic feature of all the massive sulfide polymetallic ore deposits of Rudny Altai. The ores are noted to be multicomponental, with elevated contents of the admixtures of precious metals and rare elements (Cd, Se, Bi, Te, Ta, W, etc.). Mineralogical investigations of the ores have demonstrated an intricate relationships of the major ore minerals (chalcopyrite, pyrite, sphalerite, galena) that exhibit several generations and different geochemical specialization. Minerals of Au, Ag, Te, Bi, and other elements are encountered as individual grains or microscopic inclusions and stringers in minerals of Cu, Pb, and Zn. A significant vertical range of the ore mineralization (more than 100 m), the complexity and long duration of the ore-forming processes, the clearly defined confinement of the ore mineralization to certain geochronologic levels, – all these allow us to suppose a possibility of discovery of new ore lodes or individual ore deposits within the already known ore fields of the Kazakhstan segment of Rudny Altai

Electronic Waste

2020 ◽  
pp. 82-97
Author(s):  
Moonisa A. Dervash ◽  
Syed Maqbool Geelani ◽  
Rouf Ahmad Bhat ◽  
Dig Vijay Singh ◽  
Akhlaq Amin Wani
Keyword(s):  
Sustainable Development ◽  
Nervous System ◽  
Electronic Waste ◽  
Endocrine System ◽  
Precious Metals ◽  
Labor Cost ◽  
Waste Streams ◽  
Environmental Laws ◽  
Electronic Products ◽  
Valuable Metals

Electronic waste (e-waste) is one of the swift waste streams and comprises of end of life electronic products. The Western countries as alternative destinations for disposal ship the wastes to underdeveloped and developing countries where labor cost is reasonably meager and environmental laws are feebly implemented. When not recycled, the e-waste is either incinerated or landfilled. These methods involve not only wasting valuable metals but also creating potential risk for the environment. These substances are detrimental to nervous system, kidneys, bones, reproductive system, and endocrine system, and some of them are even carcinogenic and neurotoxic. Thus, extensive research is needed to evolve sophisticated technology which may help to curb environmental pollution and contribute towards sustainable development in terms of recycling of precious metals.

Silver-Containing Concentrate Processing

2020 ◽  
Vol 989 ◽  
pp. 456-460
Author(s):  
A. V. Nikanorov
Keyword(s):  
Precious Metals ◽  
Reverberatory Furnace ◽  
High Grade ◽  
Technological Operation ◽  
Silver Recovery ◽  
Flotation Concentrate

The goal of the research was to melt the silver-containing concentrate from the Dukatsk deposit (Magadansk region) in a reverberatory furnace. Preparatory research has established that internal collector smelting is an effective way to recover precious metals from the flotation concentrate of the Dukatsk deposit. This method is based on the property of lead and copper in the concentrate in an amount comparable to that of silver, to collect precious metals in a metal or matte phase in the process of segregation smelting. Recovery of silver in a high-grade alloy in one technological operation corresponds to the planned performance (silver recovery into an alloy of 93.0%) in processing flotation concentrates at non-ferrous industry plants.

Thermodynamic analysis of thermal energy recovery and direct reduction (TER-DR) system for molten copper slag

2017 ◽  
Vol 131 (2) ◽  
pp. 1691-1698 ◽  
Author(s):  
Zongliang Zuo ◽  
Qingbo Yu ◽  
Sihong Liu ◽  
Huaqing Xie ◽  
Wenjun Duan ◽  
...  
Keyword(s):  
Thermodynamic Analysis ◽  
Thermal Energy ◽  
Energy Recovery ◽  
Direct Reduction ◽  
Copper Slag ◽  
Molten Copper
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