Determination of optimum process conditions for the extraction and separation of zirconium and hafnium by solvent extraction

2008 ◽  
Vol 90 (2-4) ◽  
pp. 115-120 ◽  
Author(s):  
M. Taghizadeh ◽  
R. Ghasemzadeh ◽  
S.N Ashrafizadeh ◽  
K. Saberyan ◽  
M. Ghanadi Maragheh
Keyword(s):  
Solvent Extraction ◽  
Optimum Process ◽  
Process Conditions ◽  
Extraction And Separation

scholarly journals Removal of nickel ions from synthetic wastewater by bulk liquid membrane

2021 ◽  
Vol 28 (1) ◽  
pp. 15-27
Author(s):  
Nashwan H. Yousif ◽  
Hussain M. Flayeh
Keyword(s):  
Kinetic Study ◽  
Liquid Membrane ◽  
Synthetic Wastewater ◽  
Bulk Liquid ◽  
Optimum Process ◽  
Process Conditions ◽  
Bulk Liquid Membrane ◽  
Nickel Ions ◽  
Initial Concentration ◽  
Extraction And Separation

Heavy metals extraction and separation from industrial wastewater has becomes a majorconcern for both environmental and economic reasons. This paper describes a comparetive kinetic study ofthe removal and recovery of nickel ions from aqueous solutions by bulk liquid membrane (BLM) usingcoupled faciletated transport mechenisms and two carriers of diffarent chemical nature: tributyl phosphate(TBP) and di-2-ethylhexyl phosphoric acid (D2EHPA). Xylene oil was used as the liquid membrane phase.In addition, environmentall friendly materials such as vegetable oils (soybean oil) used as a suitablereplacement for the conventional organic solvents in this work. A comprahensive kinetic study was carriedout and effact of various parameters such as, pH of feed and stripping phase, initial concentration of metalions, concentration of extractant in the membrane phase and stirring speed were studied. The chelatingcharacteristics of EDTA was used as stripping agent as well as precipitating agent to enhance the transportefficiency of the nickel ions. The extraction and recovery efficiency were found as 80.89% and 87.80%respectively for nickel ions, At the optimum process conditions for transport of Ni(II) were found as follows:pH in the feed phase (4), pH in the stripping phase (8), initial concentration of nickel ions (120 ppm), carrierconcentration (12%) (v/v) TBP and stirring speed (125±10 rpm), respectively.

Standard Simple of Tin Bronze for Casting Develepment

2014 ◽  
Vol 1004-1005 ◽  
pp. 1186-1192
Author(s):  
Yan Song Li ◽  
Da Wei Wang
Keyword(s):  
Reference Materials ◽  
Standard Sample ◽  
National Standard ◽  
Optimum Process ◽  
Process Conditions ◽  
National Reference ◽  
Data Analyses ◽  
Tin Bronze ◽  
Standard Values

The development of standard simple of tin bronze for casting is presented,design of composition, selection melting temperature 1150 °C, put into 0.2m3/kg argon gas, stirring with 100rpm for 1min, keeping temperature for 30min as the optimum process conditions, coarse and fine tests of homogeneity with data analyses, determination of standard values and standard deviation. The homogeneity and standard values of samples meet the national standard GB/T15000 and YS/T409-1998. The standard sample series has ratification as National Reference Materials (GSB 04-2707-2011) by National Technical Commission on Reference Materials.

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