العثور على الحق
We هي شركة ذات تقنية عالية تدمج البحث والتطوير والإنتاج والتوزيع ، وتوفر كسارة ، وصنع الرمال ، ومعدات طحن ، ومحطة تكسير متنقلة ، إلخ.
We هي شركة ذات تقنية عالية تدمج البحث والتطوير والإنتاج والتوزيع ، وتوفر كسارة ، وصنع الرمال ، ومعدات طحن ، ومحطة تكسير متنقلة ، إلخ.
The biological sulfide precipitation method uses sulfate-reducing bacteria (SRB) to reduce SO 4 2− and produce H 2 S. Heavy metals can be removed when they form sulfide precipitates with H 2 S. Due to the advantages of low costs and the high removal of heavy metals, this method has been widely investigated in the treatment of wastewaters ...Metal sulfide precipitation by sulfate-reducing bacteria (SRB) is considered to be a promising method for antimony (Sb) removal from wastewater. ... Under weathering conditions, antimony sulfide or stibnite (Sb 2 S 3), a sulfide mineral of antimony, will be rapidly oxidized and dissolved (Klimko et al., 2011; Maruška et al., 2000). Therefore, ...Bioremediation of antimony from wastewater by sulfate ... - ScienceDirectAntimony (Sb), a global and priority controlled pollutant, causes severe environmental issues. ... Metal sulfide precipitation by sulfate-reducing bacteria (SRB) has potential as a method for removing Sb from water . Sb mainly has two oxidation states in an aqueous environment, with Sb(V) and Sb(III) as the predominant species in oxic and ...Removal of Antimony in Wastewater by Antimony Tolerant Sulfate-Reducing ...احصل على السعر
Sb(III) precipitation with sulfide (e.g., iron sulfide, hydrogen sulfide) is a pH-dependent reaction. A study demonstrated that the reaction of Sb(III) at acidic pH was closely related to the precipitation of sulfide mineral Sb 2 S 3. Meanwhile, basic pH was related to the Sb(III) surface adsorption (Han et al. 2018). In the present study, the ...Although microbial sulfate reduction has long been described as a bioprocess that is inhibited in acidic conditions, recent progress has been made on sulfide bio-precipitation at low pH (Ňancucheo and Johnson 2012, 2014). More specifically, As sulfide bio-precipitation at low pH has been reported (Battaglia-Brunet et al. 2012, Le Pape et al ...Bio-precipitation of arsenic and antimony in a sulfate-reducing ...Biogenic sulfide production by SRB is a natural process, and comparably it is very low in cost, and thus the biological precipitation of heavy metals by sulfide is easy and efficient. Since antimony (a chalcophile element) has a great affinity towards sulfur compounds to form the primary precipitate of Sb called stibnite (Sb 2 S 3) under anoxic ...Efficient reduction of antimony by sulfate-reducer ... - ScienceDirectاحصل على السعر
Environmental toxicity of antimony (Sb) is significantly increased through the widespread industrial application. ... Thus, this research explores the possibilities of simultaneous metal sulfide (MeS) precipitation and electricity production using a full biological Microbial fuel cell (MFC). A non-conventional sulfate-reducing bacteria (SRB ...The arsenic (∼26 g/L) in the raffinate was then completely removed by sulfide precipitation with 99.6% of As precipitation. The arsenic precipitation slag was a mixture of As 2 S 3 and S with a mole ratio close to 1:1. The arsenic precipitation mother liquor was first cooled and crystallized, followed by causticization with lime to a NaOH ...Effect of speciation and composition on the kinetics and precipitation ...Sodium sulfide produced by disproportionation reactions reacted with lead and zinc to form lead sulfide precipitation and zinc sulfide precipitation. Antimony, lead, and zinc were inhibited in the leaching residue. Sulfur is both oxidant and vulcanizing agent. The addition of sulfur not only inhibited the leaching of lead, antimony, and zinc ...Selective Separation of Arsenic from High-Arsenic Dust in ... - Springerاحصل على السعر
Antimony-gold ores mostly consist of gold and antimony sulfide intergrowth and aurostibite (AuSb 2) . Russia ... is sold as such for applications requiring antimony sulfide or is converted to metallic antimony by iron precipitation (English precipitation) or careful roasting to the oxide followed by a reduction in a reverberatory ...Recovery of antimony from a lead silicate slag containing 10.7% Cu, 19.4% Pb, 6.5% Sb and 3.4% As through alkaline sulphide leaching has been investigated. In addition, the precipitation behavior of sodium thioantimonate and sodium hydroxyl antimonate from pregnant alkaline sulphide leachate was studied using synthetic NaOH–Na 2 S–Sb 2 S 3 ...Recovery of antimony compounds from alkaline sulphide leachatesA possible process for the recovery of tellurium from antimony and tellurium materials by alkaline sulfide leaching followed sodium sulfite precipitation was proposed. The tellurium and antimony materials were leached in 100 g/L Na 2 S solution at 80 °C for 60 min with L/S ratio of 10:1, in which 91.24% Te and 92.51% Sb were extracted into ...Recovery of tellurium from high tellurium-bearing ... - ScienceDirectاحصل على السعر
Antimony (Sb) is a metalloid in the pnictogen group of the periodic table. Its compounds have been mainly used in many industrial products worldwide, such as batteries, solders, and catalysts [1]. ... Thus, this research explores the possibilities of simultaneous metal sulfide (MeS) precipitation and electricity production using a full ...The metal sulfide precipitation process is a widely studied technology used to recover metals or remove pollutants from different aqueous sources. ... Antimony-reduced species tend to precipitate ...Removal of antimony (Sb(V)) from Sb mine drainage ... - ResearchGateSulfide precipitation is also an effective method to remove arsenic, but it is more expensive compared with lime neutralization. ( Bujňakova et al., 2014 ) removed arsenic in the form of Na 3 AsS 4 from the pregnant liquor by addition of S, crystallization and precipitation ( Fig. 7 ).Review on arsenic removal from sulfide minerals: An emphasis on ...احصل على السعر
Abstract Metal sulfide precipitation by sulfate-reducing bacteria (SRB) is considered to be a promising method for antimony (Sb) removal from wastewater. Moreover, the addition of ferrous ions (Fe (II)) to the SRB system is expected to increase the metabolic activity of SRB.Antimony (Sb), a global and priority controlled pollutant, causes severe environmental issues. ... Metal sulfide precipitation by sulfate-reducing bacteria (SRB) has potential as a method for removing Sb from water . Sb mainly has two oxidation states in an aqueous environment, with Sb(V) and Sb(III) as the predominant species in oxic and ...Removal of Antimony in Wastewater by Antimony Tolerant Sulfate-Reducing ...Antimony (Sb) is a metalloid element widely used in production of flame retardants, textiles, papers, adhesives, tires, brake linings and plastics. Sb and its chemical compounds were listed as priority pollutants by USEPA and EU due to their toxicity to humans, plants and microorganisms (Zhang et al., 2010).Removal of antimony (Sb(V)) from Sb mine drainage: Biological sulfate ...احصل على السعر
Although microbial sulfate reduction has long been described as a bioprocess that is inhibited in acidic conditions, recent progress has been made on sulfide bio-precipitation at low pH (Ňancucheo and Johnson 2012, 2014). More specifically, As sulfide bio-precipitation at low pH has been reported (Battaglia-Brunet et al. 2012, Le Pape et al ...Abstract Bio-cathode Microbial electrolysis cell (MEC) is a promising and eco-friendly technology for concurrent hydrogen production and heavy metal reduction. However, the bioreduction of Antimony (Sb) in a bio-electrochemical system with H2 production is not explored.Efficient reduction of antimony by sulfate-reducer ... - ScienceDirectIt can reduce SO 4 2-and S 2by organic matter, as shown in Eq. (1)- (2) [8,9]. The S 2produced by SRB metabolism is easy to form stable metal sulfide precipitation with heavy metal ions [10]. SRB ...Bioremediation of antimony from wastewater by sulfate ... - ResearchGateاحصل على السعر
Arizona State University. Most common oxidation states: +3, +5. M.P. 630º. B.P. 1380º. Density 6.69 g/cm 3. Characteristics: Antimony is brittle and silvery. Not very active, but reacts with oxygen, sulfur and chlorine at high temperatures. Characteristic reactions of Sb3+ Sb 3 +: (Sb (III) is the more stable oxidation state.)In the process, metal bismuth is combined with other impurity metals displaced by iron at the same time to produce crude bismuth. Precipitation smelting is applicable to process high-grade bismuth sulfide concentrate with less impurities such as lead, arsenic, and antimony. The grade of crude bismuth produced with the method is as high as 90–98%.Bismuth Metallurgy | SpringerLinkSelective sulfide precipitation of antimony is one of the major findings in the present work, which clearly suggests a means of effective recovery of antimony from solution containing antimony and other metal ions. Due to their low cost, availability and significantly high adsorption capacity, the metal-loaded gels are expected to be ...Effective removal and recovery of antimony using metal-loaded ...احصل على السعر
Dissolution of antimony sulfide in [P 66614]Cl and [P 66614][OAc] ... The powder was very voluminous, but in the course of precipitation and drying it collapsed. From 5 mL solution about 5 mg of powder could be precipitated. Similarly, a yellow to orange solid precipitated from the colored solutions obtained by dissolving Sb 2 S 3 in ...Metal sulfide precipitation processes have been studied for the recovery and removal of metals from different sources, such as cyanide solutions in gold mining [1], acid mine drainages (AMD) [2][3 ...Selective sulfide precipitation of copper ions from ... - ResearchGateSulfide precipitation flotation is a commonly used method for treating mine wastewater (Han et al., 2014, Ye et al., 2017, Li et al., 2019). Firstly, heavy metal ions in aqueous solution can be converted into insoluble sulfide precipitation in the presence of sulfurizing agents, then the valuable metal of sulfide precipitation can be separated ...Flotation and adsorption mechanism studies of antimony sulfide with 5 ...احصل على السعر
A possible process for the recovery of tellurium from antimony and tellurium materials by alkaline sulfide leaching followed sodium sulfite precipitation was proposed. The tellurium and antimony materials were leached in 100 g/L Na 2 S solution at 80 °C for 60 min with L/S ratio of 10:1, in which 91.24% Te and 92.51% Sb were extracted into ...The higher required molar S:As ratio conforms with the reduction of As(V) to As(III) coupled to sulfide oxidation (reaction (6a)), and subsequent precipitation according to reaction (6b) or the direct precipitation of As 2 S 5 (reaction (7) and Fig. S3) (Liu et al., 2016, Rochette et al., 2000, Norman, 1998, Greenwood and Earnshaw, 1997 ...Effect of speciation and composition on the kinetics and precipitation ...احصل على السعر
