degradation of ethyl xanthate in flotation residuesresidual xanthate and its byproducts in wast ewater tailings are not allowed to dispose into environmental streams due to both strong nasty smells and being toxic to biological systems [3 6].estimated reading time 5 minsgeneric decisionmaking on the retreatment of coppertailings dam retreatment can be considered as a profitable alternative when tailings contain relatively high metal contents. moreover, because of low exploration, mining, processing and closure costs, and the recent rise in copper prices, retreatment may generate positive cash flow. meanwhile revenue from metal extraction can offset rehabilitation cost leading to an improved longtermresidual xanthate froth flotation (sulphide oxidethe measurement of residual xanthates is difficult to do accurately and reproducibly. despite this, such measurements have values in diagnostics of process issues. a more general technical solution to control of the dosage of collectors is a feedback loop on the g/t rate from the tailings assays. other process variables also impact tailings assays.estimated reading time 8 minsfree residual xanthate measurement in flotation circuiti was wondering if anyone is checking into "free xanthate" or "residual xanthate" in flotation circuit; specifically in copper flotation.it's more common in g leaching to always keep tabs on your "free cyanide", but in copper flotation there is very little interest in knowing what's the residual xanthate after first rougher, second rougher, etc.estimated reading time minsdegradation of ethyl xanthate in flotation residues byfeb , · up to10%cash back· abstract the degradation behavior of ethyl xanthate (ex) salt was the most widely used collector in sulfide mineral flotation and emission of flotation tailings with residual ex was harmful to environment. in this work, hydrogen peroxide (h 2 o 2) was investigated by uvvisible spectroscopy (uv/vis) at different ph values from 3 to .minerals free fulltext reprocessing of a southernthe reprocessing of tailings can have economic and environmental benefits compared to the processing of primary ore deposits. in this paper we present the characterization of a tailings dam in southern chile by means of mineralogical and geochemical investigations, focusing on sphalerite and trace elements with the aim to investigate a potential reprocessing.effect of cuprous cyanide, dry and wet milling on thewater from different streams at the rosh pinah mine and the results are summarised in table 1. table 1. detailed analyses of water resources of rosh pinah mine (coetzer et al., 03) lead tailings thickener (p22) lead concentrate thickener quantity (m3/h) 4 1 ph 8.5 8.9 total alkalinity 2 7 cu .2 30 zn 0.34 10 pb 0.33 0.5us7585407b2 processing asphaltenecontaining tailingsembodiments of a method and a system for recovering energy, materials or both from asphaltenecontaining tailings are disclosed. the asphaltenecontaining tailings can be generated, for example, from a process for recovering hydrocarbons from oil sand. embodiments of the method can include a flotation separation and a hydrophobic agglomeration separation.treatment of mineral processing wastewater in flotationapr 28, · the xanthate in wastewater is unstable and easy to decompose. it can react with 0 2 and co 2 in the air and degrade into nontoxic compounds. experiments show that the selfcleaning effect of xanthate can reach 80%90% under aeration conditions, and the 2 oil is more stable than xanthate, and can only reach % ~ 30%.settling the tailings pond question cimnov , · settling the tailings pond question. advances in the treatment of fluid fine tailings. by graham chandler. november , . the tailings beneath syncrude research tailings technology leader jim lorentz's feet were dewatered using centrifuges. the fullscale plant began in operating in . courtesy of syncrude.removal of the residual xanthate from flotation plantapr 01, · the residual xanthate in the flotation tailings can cause environmental issues. hbe and albe were synthesized and used for removal of the residual xanthate. at optimum conditions more than 99% of the residual xanthate was removed. the kinetics, isotherm and thermodynamics studies were conducted.cited by 22life cycle assessment of the production of xanthate saltstailings slurry stream using a conventional method (termed the base case scenario). the recovery of valuable resources, such as water, residual metals and sulphur. detailed assessment would, however, require the need to expand the studied system boundary to xanthate use in the tailings desulphurisation flotation
water quality effects on flotation impacts and control ofaug , · measurements of the xanthate concentrations in the process water recycled from the tailings pond and two plant slurry tailings samples was initiated in march for the purposes of monitoring and control. fig. 9 shows the residual xanthate measurements from march to date. it can be seen that owing to summer conditions, dilution from water release during the spring melt and the increased raw water intake for mill motor cooling systems, the xanthate concentration values in the process watermechanisms of carbon mineralization from the pore to fieldjun , · innovative technologies to stabilize atmospheric co concentrations are essential in order to mitigate the harmful effects of anthropogenic greenhouse gas (ghg) emissions on the global climate system. mineralization of carbon in solid, stable carbonate minerals through reaction of co with mgrich mining wastes is a promising co sequestration strategy that offers the potential to renderwefta bolivia trip reportstream watershed (surface water contamination, groundwater contamination, sediment and soil the same chemicals (xanthate and sulfuric acid) are used in the smallscale processing. the small he has developed a strategy for cleanup of the area based on recovery of residual tin from the tailings deposited in the watershed. he hasnora schreithofer head of beneficiation groupuv/vis spectrophotometry was employed to measure residual xanthates in key process streams and process return water from the tailings storage facility. this allowed the implementation of dosage monitoring and control strategy with the objective of performance control and optimization throughout the seasonal changes during the .title head of beneficiation grouponline determination of residual collector concentrationquantity of collector chemicals in nickel flotation tailings at a concentrator plant with the developed online ce method. sodium ethyl xanthate and sodium isopropyl xanthate residuals were found in the tailings and slight correlation between the measured concentrations and the of chemical engineering uq summer researchdescription xanthate is one of the most common organic sulphur based collectors which are widely used in the froth flotation of sulphide minerals as well as in the production of viscose rayon and pesticides. however, the residual xanthate and its byproducts in wastewater are not allowed to be disposed of into environmental streams due to bothwhat are tailings in mining? quorafeb 05, · tailings are the waste products from mining. depending on the type of mining, tailings can be liquid, solid or a slurry of fine particles. tailings include finely ground rock particles ranging from sandsized to siltsized. chemicals used to ex... the environmental fate of flotation collectors inthe results obtained give some insight into the environmental fate of ethyl xanthate in tailings streams, and a basis on which to consider the environmental importance of such species in tailingsremoval of the residual xanthate from flotation plantapr 01, · the residual xanthates and their degradation products in the plant tailings may cause serious adverse health and environmental effects to humans, animals and natural ecosystems resulting from inappropriate design of the tailings disposal system (li, 90, lam, 99, zhao et al., 06). furthermore, the residual organic and inorganic compounds in the recycle process water cancited by the application of xanthate in froth flotation processapr , · xanthate, as the flotation collector with strong collection effect, is mainly used to enhance the hydrophobicity of the mineral surface to meet the requirements of flotation.xanthate is commonly used in the flotation process of sulfide minerals. xanthate is a combination of alcohol, sodium hydroxide and carbon dioxide, which is an anionic collector. . it is light yellow, soluble in water anda process report for anglog ashanti kay beea process report for anglog ashanti. kay bee. and four is taken to assay lab for g assay and the rest left at the lab for reference.for further test work, the sample is further crushed using the tertiary crusher to pass through a 4.75 mm sieve. millingfor fineguidance for the integrated use of hydrologicalfeb 28, · this paper summarizes international stateoftheart applications and opportunities for employing and deploying hydrological, geochemical, and isotopic tools in an integrated manner for investigations of mining operations. it is intended to aid formulation of more integrated approaches for evaluating the overall sustainability of mining projects. the focus is particularly on mine waters1 froth flotation fundamental principlesthe rest was lost in the tailings. (c) the % cu loss can be calculated by subtracting the % cu recovery from 100% % cu loss = 100 95.7 = 4.3% this means that 4.3% of the copper present in the ore was lost in the tailings. (d) the % weight recovery is equal
design and measurement of small recovery gains a casejun 01, 10· the streams used were rougher float feed, final concentrate, and final tailings. each shift of production operation produced a h composite sample of each of these streams. in addition to the base metal assays which were performed by the site laboratory, subsamples had to be extracted using a spinning riffler for fire assay.innovative methods of managing environmental releases at innovative methods of managing environmental releases at mine sites table of contents page 1.0 introduction 1 2.0 source reduction 3 2.1 flotation process control 3 2.2 pyrite flotation 2.3 metal cleaning technology 27 3.0 recycling 32 3.1 slag reprocessing 32 3.2 tailings reprocessing operation 45 3.3 pipe study of xanthate decomposition in aqueous solutionsmeasures need to be taken to apply xanthate in a benign. and sustainable manner in the ﬂotation operations, reducing the derived from the relationship of residual xanthate content as a. of chemical engineering uq summer researchdescription xanthate is one of the most common organic sulphur based collectors which are widely used in the froth flotation of sulphide minerals as well as in the production of viscose rayon and pesticides. however, the residual xanthate and its byproducts in wastewater are not allowed to be disposed of into environmental streams due to bothtreatment of mineral processing wastewater in flotationapr 28, · the xanthate in wastewater is unstable and easy to decompose. it can react with 0 2 and co 2 in the air and degrade into nontoxic compounds. experiments show that the selfcleaning effect of xanthate can reach 80%90% under aeration conditions, and the 2 oil is more stable than xanthate, and can only reach % ~ 30%.assessment of environmental impact of the mineral miningusually these waste streams are discharged to a tailings pond for ph control and solids settling. the supernatant is either treated before dis charge or is recycled to the mill. partially oxidized sulfur compounds may be present in mill effluent; unless they are stabilized in a waste treatment system, they can cause acidic conditions milesrecycling free fulltext evaluation of the use ofrezaei, r. removal of the residual xanthate from flotation plant tailings using modified bentonite. miner. eng. , 1, 0. [google scholar] li, x.f. teratogenic toxicity of butyl xanthate to frog embryos. acta scient. circum. 90, 10, 32. [google scholar]metal mining investigation of cause workshop chapter 6the cnt decrease over time (average of .5 ± 2.0 mg/kg in fresh tailings compared to 3.2 ± 0.7 mg/kg in aged tailings) is believed to result primarily from volatilization (decrease in ph), leaching, and bacterial degradation. the results of this study also highlighted the role of microbial activity in the fate of cyanides in mine tailings.naphtha recovery units oil sands magazinemar 06, · a naphthenic froth treatment (nft) facility produces 2 streams (1) a relatively clean diluted bitumen product and (2) a fine tailings stream, comprised of water, fine solids, residual bitumen and trace volumes of naphtha (or diluent). before the tailings can be sent to a storage pond, the naphtha is removed and recycled back into the nft process.desulfurization of the tailings at the auagcu tiouittailings from the abandoned tiouit mine site in morocco are mainly composed of sulfides, hematite, and quartz. they contain 0.061.50 wt % sulfur, mostly in the form of pyrite, pyrrhotite, and chalcopyrite. the tailings also contain g (3.365.00 ppm), silver (2437 ppm), and copper (0.060.08 wt %). flotation tests were conducted to reprocess the tailings for au, ag, and cu recoveryprocessing asphaltenecontaining tailings western oilmar 07, 06· the method according to claim 1, further comprising introducing a collector reagent comprising a fuel oil, sodium oleate, a fatty acid, a xanthate, an alkyl sulfuric salt, a dithiophosphate, an amine, or a combination or derivative thereof, into the asphaltenecontaining tailings before or while introducing gas into the asphaltenecontainingg extraction recovery processesfeb 29, · if the solution is rich enough can be treated by zinc powder and the precipitated obtained (cement) obtained will be sent to retorting and smelting. for g extraction the strength of cyanide solution ranges from 0.01 to 0.05%. lime is added to the process in order to have a ph near to 10.g flotation mineral processing metallurgyjul , · when auriferous pyrite is present, this reagent and reagent 301 constitute the most effective promoter combination. the latter is a higher xanthate which is a strong and nonselective promoter of all sulphides. amyl and butyl xanthates are also widely used. ethyl xanthate is not so commonly used as the higher xanthates for this type of flotation.