No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
for the control of arsenic in mineral processing and extractive metallurgy operations is to avoid its emissions in either the gaseous and aqueous phases. This is addressed through arsenic removal and converting it to a disposable, environmentally acceptable stable compound [5]. There is a small market for arsenic currently. ...
Arsenic is a ubiquitous metalloid and heavy metal that contributes to the global decline in human fertility. Humans are constantly exposed to arsenic through biotic and abiotic sources, especially ingestion of arsenic-contaminated food and water. Its exposure is associated with several adverse health challenges, including reproductive toxicity. In spite of its reported …
Arsenic is used industrially as an alloying agent, as well as in the processing of glass, pigments, textiles, paper, metal adhesives, wood preservatives and ammunition. Arsenic is also used in the hide tanning …
Arsenic is so carcinogenic that even low levels of arsenic intake can cause cancer (Mandal and Suzuki, 2002). Due to the arsenic-bearing hazards produced in the metallurgical process, the concentrate importing country will impose economic penalties based on the arsenic content of the concentrate (Antonio Diaz et al., 2018, Lane et al., 2016).
Arsenic is presently obtained as a byproduct of the smelting of copper, lead, cobalt, and gold ores. Arsenic xide is volatilized during smelting and accumulates in the flue dust, which may contain up to 30% arsenic xide.
Tables 5-1 and 5-2 list facilities in each state that manufacture or process arsenic and arsenic compounds, respectively, as well as the intended use and the range of maximum amounts of arsenic or arsenic compounds that are stored on site. In 2004, there were 58 and 361 reporting facilities that produced, processed, or used arsenic and arsenic ...
Arsenic has been known since ancient times in its sulfide form. The Greek philosopher Theophrastus knew about two arsenic minerals: bright yellow orpiment (As 2 S 3) and red colored realgar (As 4 S 4).Greek historian Olympiodorus of Thebes (5th century AD) was the first to obtain white arsenic (As 2 O 3) by heating arsenic sulfide.The discovery of the element …
This paper offers a critical analysis of the arsenic-accumulating, transforming bacteria and their potential use and effect in remediating agricultural soil. Given the worldwide presence, sources, types, and pathways of arsenic, accumulating, and transforming bacteria, and the effect of arsenic contamination on plant and agricultural soil were studied. Diverse …
The process temperature is a key parameter for the reconstruction of historic smelting operations since it can provide valuable information on the technological state-of-the-art as well as on ...
Pyrometallurgical processing of arsenic-bearing copper concentrates is associated with obstacles such as strict environmental regulations on arsenic release, the complexity of …
Arsenic is a highly toxic metalloid widespread in the Earth's crust, and its contamination due to different anthropogenic activities (application of agrochemicals, mining, waste management) represents an emerging …
The invention claimed is: 1. An arsenic removal method, comprising: a leaching step of leaching a non-ferrous smelting intermediate comprising a copper arsenic compound in the form of an intermetallic compound in the presence of monatomic sulfur, and obtaining a leaching solution comprising arsenic; a solution adjusting step of oxidizing trivalent arsenic in …
Batch pressure leach test work was conducted in 4 L autoclaves. Various compositions of feed solids, including both concentrates and/or the arsenic dust described above, and quench solutions (process water and acid plant effluent) were tested over a range of operating temperatures (200–230 °C) to select the conditions for pilot plant testing.
The practicability of a pyrometallurgical scheme for raw material processing is established as a result of the analysis of methods intended to dearsenate and process gold-arsenic concentrates as well as equipment for the process execution. The conceptual design of vacuum equipment without forced movement of the dispersed material in the sublimator and of …
Arsenic metallurgy is a technology of extracting white arsenic or pure arsenic from arsenic-bearing minerals. In 1250, Albertus Magnus (Albert the Great, 1193–1280) from …
The oxidation process was performed by continuous EC of the applied aerobic iron because it occurs in the electrochemical reactor (see Fig. 3) and average arsenic sludge generated from the process (35.8–70.64 mL L-1 per cycle). The oxidation process represents electrochemical coagulation, and As(III) oxidizes at pH conditions of 6.5–8.5 ...
Arsenic-free acid (96% strength) was produced by the vanadium-catalyzed contact process due to the fact that arsenic-free starting materials had to be used because of poisoning of the catalyst by arsenic. There were many uses for the less-concentrated, and therefore cheaper, acid: two products in particular suffered from the presence of arsenic ...
arsenic xide into crystalline scorodite (FeAs0 4 • 2HzO) using acidic nitrate solu tions at temperatures ranging from 140°C to 160"C. A schematic process flow sheet is proposed. The reasons for processing arsenic xide, especially baghouse dust from met allurgical operations, lie in its toxic charac
The purpose of this briefing is to provide a general overview about the occurrences of arsenic, its economic uses, and its environmental and health impacts. ... The mining, mineral processing and metallurgical industries support and strictly follow state and federal regulations to ensure protection of the environment and the health of industry ...
Arsenopyrite, the main arsenic-containing mineral, has emerged as the major source of environmental arsenic pollution. However, despite the ubiquity of arsenopyrite and the potential environmental impact and health hazards of arsenic on the environment, limit information is available regarding the stability and geochemical decomposition reactions of arsenopyrite in …
Table IV shows the level of development of some technology responses for processing complex arsenic-containing materials.30, 31 Most of these technologies have been developed to process high-arsenic-containing streams. However, with blending continuing to be the most popular approach, a gradual increase in arsenic content in copper concentrates ...
The practicability of a pyrometallurgical scheme for raw material processing is established as a result of the analysis of methods intended to dearsenate and process gold-arsenic concentrates as ...
The choice of a sulfuric acid or alkaline method of waste processing is defined by the technological possibilities of separating arsenic from the resulting solutions and the use of …
In the Chimera process, higher concentrations of arsenic and/or antimony in the sulphide feed (and lower iron-to-arsenic or iron-to- antimony molar ratios) can have a significant impact on the rate of nickel extraction from the laterite ores. This can be managed at the design stage by controlling the Fe:As and/or Fe:Sb mole ratios in the ...
Arsenic and arsenic compounds were considered by previous IARC Working Groups in 1979, 1987, and 2002 (IARC, 1980, 1987, 2004). ... water, use of arsenic-containing pesticides), and food-processing techniques. The highest concentrations of arsenic have been found in seafood (2.4–16.7 mg/kg in marine fish, 3.5 mg/kg in mussels, and more than ...
Arsenic is trapped via precipitation, adsorption, and ion exchange mechanisms. Zero-valent iron, montmorillonite, and zeolites have been used as reactive barriers. Arsenic …
Abstract The processing of gold bearing sulphide minerals which contain arsenopyrite and other complex arsenic sulphide minerals results in arsenic containing emissions and effluents which must be given careful consideration in relation to clean air and clean water standards. The sources of arsenic and the various process options for treating arsenical gold …
Both roasting and (bio)hydrometallurgy can remove arsenic from sulfide minerals. (Bio)oxidation is one main method for arsenic removal from sulfide minerals. Selective …
In this study, we review the distribution and migration of arsenic in the mining area, focus on the geochemical cycle of arsenic under the action of microorganisms, and summarize …
A hydrothermal upgrading process was developed for removal of heavy metals, including arsenic, lead, zinc and copper, and upgrading bio-oil from P. vittata and a heavy metals removal efficiency of >99% and crude bio-oil upgrading efficiency of 83.76% were attained under the determined conditions. The hydrothermal upgrading bio-oil products are potential for the …
