scholarly journals Removal of cobalt from synthetic zinc sulphate electrolyte by cementation with zinc dust

1973 ◽  
Author(s):  
D J MacKinnon
Keyword(s):  
Zinc Sulphate ◽  
Zinc Dust ◽  
Sulphate Electrolyte

scholarly journals A multi-channel photometric detector for multi-component analysis in flow injection analysis

1994 ◽  
Vol 16 (2) ◽  
pp. 71-73 ◽  
Author(s):  
Aimin Tan ◽  
Jialin Huang ◽  
Liudi Geng ◽  
Jinhua Xu ◽  
Xinna Zhao
Keyword(s):  
Zinc Sulphate ◽  
Light Emitting Diode ◽  
Single Chip ◽  
Single Chip Microcomputer ◽  
Light Emitting ◽  
Flow Cells ◽  
Photometric Detector ◽  
Sulphate Electrolyte ◽  
Multi Wavelength

The detector, a multi-channel photometric detector, described in this paper was developed using multi-wavelength LEDs (light emitting diode) and phototransistors for absorbance measurement controlled by an Intel 8031 8-bit single chip microcomputer. Up to four flow cells can be attached to the detector. The LEDs and phototransistors are both inexpensive, and reliable. The results given by the detector for simultaneous determination of trace amounts of cobalt and cadmium in zinc sulphate electrolyte are reported. Because of the newly developed detector, this approach employs much less hardware apparatus than by employing conventional photometric detectors.

scholarly journals Influence of Electrodeposition Parameters on Morphology and Polymer Inclusion into Polymer/Zn Composite Coatings

2022 ◽  
Vol 58 (4) ◽  
pp. 138-146
Author(s):  
Alina Crina Muresan ◽  
Lidia Benea
Keyword(s):  
Zinc Sulphate ◽  
Composite Coatings ◽  
Metallic Matrix ◽  
Regular Surface ◽  
Pure Zinc ◽  
X Ray ◽  
Polymeric Particles ◽  
Sulphate Electrolyte ◽  
Fine Surface ◽  
Hexagonal Crystals

In this study different type of composite coatings was obtained by electrodeposition using zinc as matrix and polymeric particles as disperse phase in zinc sulphate electrolyte. The effects of some electrodeposition parameters on the thickness and morphology of obtained composite coatings were analysed by optical microscopy, Scanning Electron Microscopy (SEM) and Energy-Dispersive X-Ray Spectroscopy (EDX) methods. Polymeric particles inclusion into zinc matrix was correlated with imposed electrodeposition parameters. It was observed that the thickness of the coatings is influenced by electrodeposition parameters. From the morphology of the coatings, it could be concluded that pure zinc has a regular surface with hexagonal crystals, while the composite coatings have fine surface structure. Also, the electrodeposition parameters influence the inclusion of the dispersed phase into metallic matrix that will influence further the different properties of the composite materials.

Influencing Factors and Mechanism of Cobalt Redissolution from Zinc Sulphate Solution

2011 ◽  
Vol 402 ◽  
pp. 12-16 ◽  
Author(s):  
Gui Sheng Zeng ◽  
Ming Jing Li ◽  
Yu Xie
Keyword(s):  
Particle Size ◽  
Influencing Factors ◽  
Zinc Sulphate ◽  
Zinc Dust ◽  
Copper Ion ◽  
Sulphate Solution ◽  
Detention Time ◽  
Large Particles ◽  
Zinc Sulphate Solution

Redissolution of cemented cobalt from zinc sulphate solution occurs, and is a well known problem among zinc producers. A variety of mechanism of cobalt redisisolution have been proposed in the literatures, however, it is still not very well understood. The influencing factors of cobalt redissolution such as detention time, oxidation, particle size of zinc dust and copper ion have been investigated in this paper. The redissolution does not occur when very large particles are used but the redissolution of cobalt is significant from small zinc particles. The redissolution is obvious with copper ion added, while the redissolution is not occurred from the zinc sulphated solution without copper ion added. The redissolution mechanism of cobalt is obtained.

scholarly journals Removal of cobalt and nickel from zinc sulphate solutions using activated cementation

2004 ◽  
Vol 40 (1) ◽  
pp. 41-55 ◽  
Author(s):  
B. Boyanov ◽  
V. Konareva ◽  
N. Kolev
Keyword(s):  
Great Degree ◽  
Zinc Sulphate ◽  
Zinc Dust ◽  
Lower Degree ◽  
Production Plant ◽  
Optimal Conditions ◽  
Zinc Production ◽  
Cobalt And Nickel

The influence of different parameters (duration, temperature, zinc dust quantity, concentration of activators - copper and antimony) on the process of activated cementation of Co and Ni has been studied. We have worked with industrial zinc sulphate solutions. During the process of activated cementation of Co and Ni, copper (involved as CuSO4.5H2O) and antimony (involved as Sb2O3) were used as activators. The lowest values of Co content have been obtained at a temperature of 80-85 oC, CCu = 200-300 mg/dm3 and 18 multiple surplus of zinc dust. After adding Cu to the solution, mainly the cementation of Ni is activated, and that of Co is activated to a lower degree. It was found that when GSb : GCo ratio is between 0.5 : 1 and 2 : 1, the solution is purified from Co and Ni to a great degree. After intensive stirring and increasing the duration of the process the cement sediments dissolve reversely. This holds true of Co to a greater extent, as compared to Ni. The results obtained will be used to establish optimal conditions for the carrying out of activated cementation in Zinc Production Plant in KCM SA, Plovdiv.

scholarly journals Optimal control problems arising in the zinc sulphate electrolyte purification process

2012 ◽  
Vol 54 (2) ◽  
pp. 307-323 ◽  
Author(s):  
Ling Yun Wang ◽  
Wei Hua Gui ◽  
Kok Lay Teo ◽  
Ryan Loxton ◽  
Chun Hua Yang
Keyword(s):  
Optimal Control ◽  
Zinc Sulphate ◽  
Optimal Control Problems ◽  
Control Problems ◽  
Purification Process ◽  
Sulphate Electrolyte
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