• Hydrometallurgical valorization of chromium, iron, and

    Jan 31, 2019· After the solvent extraction of Cr(VI) from electroplating effluent, the Cr-removed solution containing 1.3 g·L −1 Zn, and 0.4 g·L −1 Fe was treated for iron removal and zinc recovery purposes. In that course, pH of the solution was adjusted to 3.5 under the maintained condition of stirring speed 250 rpm, temperature 90 °C, air passing

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  • Selective extraction of zinc(II) over iron(II) from spent

    Around 92.5% of zinc and 11.2% of iron were extracted from effluent 1 in one single contact using 100% (v/v) of TBP. With Cyanex 301, around 80–95% of zinc and less than 10% of iron were extracted from effluent 2 at pH 0.3–1.0. For Cyanex 272, the highest extraction yield for zinc (70% of zinc with 20% of iron extraction) was found at pH 2.4.

  • Cited by: 123
  • Selective extraction of zinc(II) over iron(II) from spent

    Feb 11, 2008· The extraction of zinc and iron from effluent 2 at changing initial concentrations of Cyanex 301 as extractant is shown in Fig. 7. Experiments were carried out at pH 0.75 and A/O ratio of unity. As expected, a higher percentage of extraction of zinc and iron were obtained when the concentration of Cyanex 301 was raised.

  • Cited by: 123
  • Studies on solvent extraction of iron(III) as a step for

    Request PDF Studies on solvent extraction of iron(III) as a step for conversion of a waste effluent to a value added product Solvent extraction of iron(III) from actual sulphate waste pickle

  • Effluents Treatment Generated by Biolixiviation in the

    Apr 02, 2019· Zambrano Johanna, Zambrano Johnny, Effluents Treatment Generated by Biolixiviation in the Extraction of Precious Metals through Selective Recovery of Iron, Copper and Zinc, International Journal of Mineral Processing and Extractive Metallurgy. Vol. 4, No. 2, 2019, pp. 44-50.

  • Author: Zambrano Johanna, Zambrano Johnny
  • Studies on solvent extraction of iron(III) as a step for

    Dec 01, 2011· Highlights Trialkylphosphine oxide used effectively and efficiently for Fe (III) extraction from spent pickle liquor. Saturated loading capacity of 40% solvent for Fe(III) extraction found to be 51.85 g/L in four contacts at O/A ratio of 1/1. 5% Oxalic acid disengaged 100% Fe(III) from the iron loaded organic. large scale studies with techno-economic assessment needs to be done for practical

  • Recovery and separation of sulfuric acid and iron from

    Mar 05, 2016· The results indicate that the extraction yields of iron(III) and sulfuric acid increase slightly from 85.4% and 97.6% to 90.1% and 98.4% respectively with the increase of TBP concentration. This phenomenon shows that the improvement of extraction yields is obtained by the increase of the complex solubility with the addition of TBP.

  • Ore Mining and Dressing Effluent Guidelines Effluent

    What Is Ore Mining and DressingRulemaking HistoryAdditional InformationMine operators extract ores (metal-bearing rock) from underground mines and surface mines using machinery, explosives and chemicals. Extraction processes include dressing (picking, sorting, washing of ores), milling (crushing, grinding, etc.) and beneficiation (processing to improve purity/quality).Wastewater is generated during the mining process from groundwater produced during ore extraction, from water used by operators for equipment cooling and dust control, and from precipitation
  • Zero Effluent Discharge System Crown Iron Works

    The Crown Zero Effluent Discharge System (ZED) is designed to eliminate the wastewater from your solvent extraction plant. The water waste is concentrated in specially designed pressure vessels and converted to 40 psig steam for recycle in the extraction plant. Blowdown water from the cooling tower can also be added for further savings.

  • Petroleum Refining Effluent Guidelines Effluent

    What Is Petroleum RefiningFacilities CoveredImplementation and Guidance DocumentsRulemaking HistoryAdditional InformationPetroleum refineries process raw crude oil into three categories of products: 1. Fuel products—gasoline, distillate fuel oil, jet fuels, residual fuel oil, liquefied petroleum gases, refinery fuel, coke & kerosene 2. Nonfuel products—asphalt and road oil, lubricants, naphtha solvents, waxes, nonfuel coke, & miscellaneous products 3. Petrochemicals and petrochemical feedstocks—naphtha, ethane, propane, butane, ethylene, propylene, but在epa.gov上查看更多信息
  • Ore Mining and Dressing Effluent Guidelines Effluent

    Extraction processes include dressing (picking, sorting, washing of ores), milling (crushing, grinding, etc.) and beneficiation (processing to improve purity/quality). Wastewater is generated during the mining process from groundwater produced during ore extraction, from water used by operators for equipment cooling and dust control, and from

  • Studies on solvent extraction of iron(III) as a step for

    Request PDF Studies on solvent extraction of iron(III) as a step for conversion of a waste effluent to a value added product Solvent extraction of iron(III) from actual sulphate waste pickle

  • Petroleum Refining Effluent Guidelines Effluent

    EPA promulgated the Petroleum Refining Effluent Guidelines and Standards (40 CFR Part 419) in 1974 and amended the regulations in 1975, 1977, 1982 and 1985.The regulations cover wastewater discharges at over 140 refineries across the country.

  • (PDF) Removal of Antimony from Effluents Generated During

    Aluminium, calcium and iron containing coagulants were screened for the clean-up of the remaining supernatant, post-uranium removal, ensuring the final effluent meets the relevant release criteria

  • Iron removal by physical chemical way Lenntech

    Iron is one of the most abundant metals of the Earth's crust. It occurs naturally in water in soluble form as the ferrous iron (bivalent iron in dissolved form Fe 2+ or Fe(OH) +) or complexed form like the ferric iron (trivalent iron: Fe 3+ or precipitated as Fe(OH) 3).The occurrence of iron in water can also have an industrial origin ; mining, iron and steel industry, metals corrosion, etc.

  • GB1386069A Extraction or iron Google Patents

    1386069 Chemical extraction of iron NATIONAL RESEARCH DEVELOPMENT CORP 14 Feb 1972 54175/70 Heading ClA [Also in Division C7] Iron is extracted in a process which comprises converting iron contained in a feedstock into FeCl 2 in the form of an aqueous solution using an aqueous chloridizing agent containing HCl, precipitating the FeCl 2 from the solution using an agent containing

  • PAPER OPEN ACCESS Removal of sulfides from tannery

    of iron sulfide is formed. The process of effluent treatment is determined by the anode current density. The most efficient effluent treatment is carried out at a current density of 133 A/m. 2. In this case, the purification efficiency reaches 99.2%, and the cost per unit

  • Solvent extraction for metal and water recovery from

    ABSTRACT. The use of solvent extraction to recover metals and water from industrial residues is highlighted in this . The method was applied (1) to selectively concentrate Zn from effluents generated by the zinc industry, (2) to separate Zn and Fe from spent pickling effluents produced by the hot-dip galvanizing industry, and (3) to recover Co and Ni from spent batteries.

  • Removing Heavy Metals From Wastewater

    the next step is to add aluminum or iron salts, or organic polymers (coagulants) directly to the wastewater. These polymers attach to the metal solids particles. The small metal hydroxide particles become entangled in these polymers, causing the particle size to increase (form flocs), which promotes settling. This effect is illustrated in Figure 9.

  • ANALYTICAL METHODS FOR QUANTITATIVE AND

    3. Liquid/liquid extraction of an acidified sample, separation and drying of the extract (6). 4. Lime coagulation, filtration, modification of filtered material, fluffing, and extraction for four hours(7). 5. Oil extraction of sewage solids or sludge and extraction of the oil (8).

  • US4331551A Method of removing ruthenium contamination

    A method of removing ruthenium contamination from a radioactive liquid effluent, wherein: (a) the pH of said effluent is adjusted to a value of less than 5 and copper ions are added thereto, (b) the effluent thus treated is brought into contact with iron to form a copper precipitate which entrains the ruthenium, and (c) the liquid effluent is separated from the sludge formed.

  • (PDF) Extractant and Solvent Selection to Recover Zinc

    A solvent extraction (SX) process using Ionquest 290 as extractant was developed to recover the Zn from the effluent. Ferrous ions were bio-oxidized and removed by selective alkaline precipitation