1 edition of ion-exchange process for recovery of chromate from pigment manufacturing found in the catalog.
ion-exchange process for recovery of chromate from pigment manufacturing
1974 by Environmental Protection Agency, Office of Research and Development, National Environmental Research Center in Cincinnati, Ohio .
Written in English
|Statement||by Donald J. Robinson ... [et al.].|
|Series||Environmental protection technology series ; EPA-670/2-74-044, Research reporting series -- EPA-670/2-74-044.|
|Contributions||Robinson, Donald J., National Environmental Research Center (Cincinnati, Ohio), Mineral Pigments Corporation.|
|The Physical Object|
|Pagination||x, 92 p. :|
|Number of Pages||92|
J Hi, Ravi. Ion exchange columns are gradient processes rather than stochiometric processes. I apologize if these aren't exactly the right terms, but I'm trying to say in a shorthand way, and with a graphic that fades from one color to another, that the concentration of metal or acid at one cm into the column is greater than at two cm in, which is greater than at three cm in. The adsorption of chromium on these cation exchange resins follows the first-order reversible kinetics. The ion exchange resins investigated in this study showed reversible uptake of chromium and, thus, have good application potential for the removal/recovery of chromium from aqueous solutions. PMID: [Indexed for MEDLINE] Publication Cited by: (A) Type I grade of reagent water shall be prepared by distillation or other equal process, followed by polishing with a mixed bed of ion-exchange materials and a µm membrane filter. Feed water to the final polishing step must have a maximum conductivity of 20 µS/cm at K (25°C). Type I reagent water may be produced with alternate technologies as long as the appropriate constituent. Recovery of Metals from Sludges and Wastewaters (Pollution Technology Review) (No. ) E.R. Krishnan State-of-the-art metals treatment and recovery technologies to assist in identifying waste management options.
applications through the process of fission product recovery. During the period of –, (strontium nitrate), paint pigments (strontium chromate), fluorescent lights (strontium phosphate), getters Examples of the physical form of LLW are spent ion exchange resins, filter sludges, filter cartridges, evaporator bottoms File Size: KB.
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Ion-exchange process for recovery of chromate from pigment manufacturing. Cincinnati, Ohio: Environmental Protection Agency, Office of Research and Development, National Environmental Research Center, (OCoLC) Material Type: Government publication, National government publication, Internet resource: Document Type: Book, Internet.
EPA/ June AN ION-EXCHANGE PROCESS FOR RECOVERY OF CHROMATE FROM PIGMENT MANUFACTURING By Donald J. Robinson Harold E. Weisberg Glenn I. Chase Kenneth R. Libby, Jr. James L. Capper Mineral Pigments Corporation Beltsville, Maryland Project ERM Program Element 1BB Project Officers Richard B.
Tabakin and John Ciancia. Ion-Exchange Process for Recovery of Chromate from Pigment Manufacturing [U. Environmental Protection Agency] on *FREE* shipping on qualifying offers. The U.S. Environmental Protection Agency (EPA) was introduced on December 2, by President Richard Nixon. The agency is charged with protecting human health and the environment.
Ion exchange for chrome recovery from "green chromating" effluents. I represent a company which implements effluent and waste treatment ion-exchange process for recovery of chromate from pigment manufacturing book.
I am ion-exchange process for recovery of chromate from pigment manufacturing book assessing the feasibility of implementing an ion exchange system for treating the effluent from.
Sorption recovery of toxic ions – chromium (VI) and manganese (II) – from aqueous solutions with different acidity (– M HCl) was investigated on cation and anion exchangers synthesized with long-chained cross-linking agents (LCA).
The initial concentrations of Cr(VI) and Mn(II) were 1 g/L and 5 g/L, by: The chromate ion-exchange recovery process is always carried out at acidic pH because of its much higher chromate removal capacity at acidic pH as opposed to alkaline pH.
However, acidic pH operation always gives rise to early, gradual chromate breakthrough during conventional fixed-bed column by: The initial ion exchange process for chromate removal used a WBA resin.
This ion-exchange process for recovery of chromate from pigment manufacturing book, sized to treat 50 gpm flowrate, while effective, was found to be costly to operate due to limited resin capacity and expensive regeneration.
Equations 1 and 2 show the ion-exchange and regeneration reactions for the chromate ion–WBA resin system. Ion Exchange Ion exchange can attract soluble ions from the liquid phase to the solid phase, which is the most widely used method in water treatment industry. As a cost-effective method, ion exchange process normally involves low-cost materials and convenient operations, and it Cited by: anionic exchanger from the chloride solution respectively.
A four-step ion exchange process for chromic acid recovery from waste acid solutions was proposed by Lin and Kiang . In ion-exchange process for recovery of chromate from pigment manufacturing book of the above, ion-exchange process has been used for the extraction of zinc and chromium from electroplating effluent using cationic and anionic Size: KB.
wastewater are Chemical precipitation, Ion exchange, Adsorption, Reduction, Solvent extraction, Reverse osmosis . Removal of chromium(VI) and recovery of Chromic acid from chrome plating industry wastewater by ion exchange process is challenging.
All the File Size: KB. The ion-exchange adsorption process for both V(V) and Cr(VI) showed maximum capacity at pH for an initial concentration of mg L⁻¹, and reached equilibrium after about 40 min of contact.
directly (Ashraf and Shazhad, ). Ion exchange a physico-chemical process is an economic and convenient method that can directly and adequately removes heavy metals ions in trace concentration from industrial solutions and wastewater. Arup, et al.,reported the mechanism and some properties of Chromate Ion exchange.
The uptake of these. The process, when carried out in a 20 liter continuous stirred tank reactor removed 25– mg chromate/l in –8 h with >% efficiency in the presence of sugarcane molasses as nutrient.
A four-step ion exchange process for chromic acid recovery from waste acid solution was proposed in the present work. Strong acid anionic (OH-type) ion exchange resin was used in the first step to capture chromic acid (H 2 CrO 4) which was converted to sodium chromate (Na 2 CrO 4) by sodium hydroxide (NaOH) solution in the second step.
Sodium chromate was converted back to chromic acid. Introduction Ion exchange resins (IER) can be used in the metal plating and surface finishing industries in a num-ber of ways: rejuvenation of plating baths and pickling solutions, recycling of rinse waters, as well. Although there are a number of problems associated with this procedure, it is the best one in common use.
One plant is successfully using an ion-exchange process for the recovery of chromates (EPA Project ERM). About kg (1, Ib) of chromate, formed by regenerating the ion- exchange resins at high pH, is being recovered per day.
equilibrium after about 90 min of contact. The ion exchange process, which is pH dependent showed maximum removal of chromium (VI) in the pH range for an initial chromium (VI) concentration of mg/dm3. The equilibrium related to Lewatit FO36 ion- exchange capacity and the amounts of the ion exchange were obtained using the plots of the.
USA USA USA USA US A US A US A US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords exchange sulfuric acid resin solution ion exchange Prior art date Legal status (The legal status is an assumption and is not a legal Cited by: 7.
When ion exchange is applied to metal recovery, the metal values obtained from the regeneration process may not be suitable for return directly to the plating bath. Concentration and pH adjustment are frequently required before reuse.
Much of the regeneration rinse waters are too dilute or otherwise unsuitable for reclaim; they will. required for recovery of chromium for the reuse of treated water.
The present study endeavors to recover the chromium by an electrochemical ion exchange (EIX) method. This combines ion exchange (IX) and electrodialysis (ED) for the removal and concentration of chromate ions from the effluent and recycles the treated water for conservation of water.
IJRET: International Journal of Research in Engineering and Technology. eISSN: | pISSN: TREATMENT OF WASTEWATER FROM CHROME PLATING INDUSTRY BY ION EXCHANGE METHOD Sujata. Cr(VI) (as chromate) was eluted using an ammonium nitrate solution buffered between pH 4 and 12 to match the pH of the sample.
The authors noted that as pH increased, some Cr(III) was partially retained due to the formation of the hydroxo-Cr(III) species partially bound to File Size: KB. USA USA USA USA US A US A US A US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords vanadium solution lead chromate ions Prior art date Legal status (The legal status is an assumption and is not a legal by: 7.
The objectives of the research project are to: (1) design, construct and test a bench scale fuel cell electrode ion exchange membrane process (FCMP) to remove contaminants from chromium plating solutions; (2) field test FCMP or its modifications in operating plating shop; and (3) develop a detail working model to optimize the process.
Ion exchange as well as lime treatment is another method that can be applied in this process to reduce some of the toxic trace metals in the wastewater from the plant. SUMMARY The pollution prevention strategy in the inorganic chemical industry is largely dependent on the age and size of the facility and the type and number of processes.
Twenty years ago, using chromate conversion coatings to protect zinc and zinc-alloy deposits was considered state-of-the-art. Due to severe health and environmental (HS&E) concerns, the use of hexavalent chromium [Cr(VI)] was virtually banned, 1 resulting in the acceptance and use of more environmentally-friendly, trivalent chromium [Cr(III)]-based passivates as a viable option.
– Studies of workers in the chromate production, plating, and pigment industries consistently show increase rates of lung cancer. – Insoluble forms such as zinc chromate are the most potent – 20 year cancer latency Arvind Gupta, M.
Tech Chemical5/12/ 7 Engineering. A rhodium-recovery process which comprises contacting a solution of HRh(CO)(PPh 3) 3 catalyst in an organic solvent selected from the group consisting of aromatic and aliphatic hydrocrbons, halogenated aromatic and aliphatic hydrocarbons, ethers, and mixtures thereof, with an acidic ion-exchange resin that has sulfonic acid active groups, a.
Project Report On Allied And Chemical Industries Including Alcohol, Alprazolam, Vodka, Acetone, Acid, Activated Charcoal, Alum, Dye, Naphthalene, Activated Carbon.
In this paper, the chrome plating wastewater of a tin factory in Zhongshan City was taken as research object. In order to offer help for enlarging technique, we studied the pilot plant test of disposing and reclaiming chrome plating wastewater with ion exchange technique and optimized the technological conditions of ion : Jin Yong Yang, Mei Ling Kong, Shuang Quan Li, Xiao Ou Ma.
temperature influence the adsorption process dynamics. The gold elution from the loaded resin was made with a mixture of organic solvent and hydrochloric acid. The gold recovery efficiency based on the Amberlite XAD-7 selective ion-exchange resin was over %.
Keywords: gold, recovery, chloride media, Amberlite XAD-7 1. Introduction. Activated carbons derived from biomass waste material can be favorable compared to conventional activated carbons with respect to their adsorptive properties, low cost, and renewable sources. Literature about Cr(VI) adsorption onto biomass waste material based activated carbons has been reviewed.
Activated carbon derived from peach stone was used for Cr(VI) adsorption from aqueous by: 2. Tauqeer Ahmad et al.,Vol.
36, No. 5, Ion Exchange Removal of Chromium (III) from Tannery Wastes by Using a Strong Acid Cation Exchange Resin Amberlite IR H + and its Hybrids 1,2Tauqeer Ahmad*, 2Syed Mustafa, 2Abdul Naeem, 1Farooq Anwar 1Tahir Mehmood and 2Khizar Hussain Shah2 1Department of Chemistry, University of Sargodha, Sargodha, Pakistan.
Potassium dichromate is a potassium salt that is the dipotassium salt of dichromic acid. It has a role as an oxidising agent, an allergen and a sensitiser. It contains a dichromate (2-).
Expand this section. 2 Names and Identifiers. Expand this section. 3 Chemical and Physical Properties. Expand this section. ning, metal plating, water cooling and pigment manufacturing, are responsible for water and soil contamination by chromium (Katz and Salem, ).
Various technologies, have been used for the removal of Cr (VI) including: reduction of Cr (VI) to Cr (III), followed by Cr (III) precipitation under alkaline conditions (KratochvilCited by: What is claimed is: 1.
A continuous cyclic process for removing from influent water at least one of a first member selected from the group consisting of hexavalent chromium and molybdate, and at least one of a second member selected from the group consisting of trivalent chromium and zinc comprising 1.
introducing said water containing said first and second members entrained therein into. Ion exchange can be used to remove zinc from wastewater. HydroFlo ion exchange systems are designed to treat plating rinse water with trace amounts of metals.
The water is sent through cation and anion resin beds, along with activated carbon and/or media filtration to produce deionized water that can be returned to the process. The detailed project reports cover all the aspects of business, from analysing the market, confirming availability of various necessities such as plant & machinery, raw materials to forecasting the financial requirements.
The scope of the report includes assessing market potential, negotiating with collaborators, investment decision making. Sodium Dichromate is an orange to red colored, crystalline, inorganic compound that emits toxic chromium fumes upon heating.
Sodium dichromate is highly corrosive and is a strong oxidizing agent. This substance is mainly used to produce other chromium compounds, but is also used in drilling muds, in metal treatments, in wood preservatives, in.
Subjects Subjects / Keywords: Adsorption (lcsh) Carbon, Activated (lcsh) Chromium -- Toxicology (lcsh) Environmental Engineering Sciences thesis Ph. In the present pdf, the recovery of metal ions from industrial solid residues from a galvanoplasty industry pdf de Janeiro, Brazil) was investigated by cationic and anionic ion exchange resins.
The electroplating residues were composed of the metals Cu2+, Fe3+, Al3+, Ni2+, and Cr3+. The studies of sorption were conducted under batch and column by: 7.Description: well as important trend graphs.
Efficient Cation Exchange The ASTM Dcompliant cation resin cartridge has a small diameter that allows ion exchange kinetics to achieve lower, more accurate readings than larger cartridges that leach.
This enables faster plant start-ups Built-in Temperature Sensor: Yes.Check process suppliers recommended ebook and electrolyte concentrations and ensure the operation is controlled within these limits.
Also check if variation is within a load or from load to load. If latter check consistency of anodising and colouring practices. Recovery: Strip and .