Selective leaching of cadmium from the filter cake of the wet zinc smelting plant

Aparajith.B et al. studied a simple wet process for the selective recovery of cadmium from Cd-Cu-Zn filter cakes produced in the electro- zinc process. The conventional process of leaching, filtering and re-leaching of cadmium requires multiple stages and is costly. The purpose of this study was to find a simpler way to recover cadmium from the copper -cadmium filter cake in the zinc purification stage of the electrolytic zinc process. The procedure investigated included removal of zinc from the Cu-Cd filter cake, selective leaching of cadmium and purification of cadmium by removal of Fe, Tl and Co followed by electrolysis and melting.

The zinc in the Cu-Cd filter cake is transferred to the liquid phase in two stages, and copper and cadmium are enriched in the filter cake. The leaching of cadmium from the filter cake is carried out at a higher solid-liquid mass-volume ratio, and the concentration of cadmium in the solution is higher. Selective leaching of cadmium under special conditions minimizes the co-precipitation of impurities in the cadmium-rich solution.

The leaching reaction stops at the beginning of the dissolution of copper. Impurities and precipitates such as T1, Fe and Co are oxidized and precipitated with KmnO4 and NaOH. Cadmium sulfate solution was purified by cathodic electrolysis Cd, and 99.95% of the resulting molten metal cadmium. The total recovery of cadmium in the entire process is 70% to 72%. Based on the results of this study, a conceptual process was developed.

Industrial sectional High Speed Overhead Door

Electric Overhead Sliding Door For Logistic
Product Description:

Name	Sectional overhead glass panel garage door
Operation way	electric /remote/manual
Position	garage/shop/auto4S store/Industrial/Garden etc.
Door panel structure	aluminum alloy frame +Tempered Glass / Polycarbonate Glass /double-glazing
Door panel frame	material	aluminum alloy
	thickness	2.0mm
	color	white, black ,gray, silver gray, wood grain, cream (any colours can be specified)
	surface Treating	baking varnish
Thickness of door panel	40mm/50mm
Core of the door panel	Tempered Glass	5.0`6.0mm thickness ,Full view clear or frosted
	Polycarbonate Glass	5.0mm ~10mm thickness ,Full view clear or frosted
	aluminium sheet	9.0mm in thickness,baking varnish with surface traeting,color like the frame
	other tempered Glass	mirror glass,baking glass and many kind of glass for your options

choose your glass:
The glass can be use polycarbonate glass( clear or frosted )
and tempered glass (clear or frosted/coated colour /tinted color/mirrow)
5-10mm thickness for glass
>>Tempered Glass - enhanced safety
>>Polycarbonate - superior strength with UV protection

hardware Accessories

Guide rail	Size	2"/3"
	Materail	galvanized steel
	Thickness	2.0mm
Bracket	Materail	galvanized steel
	Thickness	3.0mm
Hinge	Model	Finger-protect/normal
	Materail	galvanized steel
	Thickness	3.0mm
Roller	Size	2"/3"
	Materail	galvanized steel/Nylon
shaft	Model	solid/hollow
	Materail	galvanized steel
External key lock	For independent garage door, this sort of lock allows you to use external key to start the clutch deviceand open the door in case of power failure under the condition that there are no entries or side doors.
Box airbag safety system	The door will be automatically to rise If there are any obstacles in the process of downward
Spring break device	When the spring is broken,the door can auto stop to prevent the door falling down
Cable break safety system	Once the cable is broken ,this device will blocked on the guide rails in case of breakage of the steel wire prevent the door falling down
V external reinforcing bars	helping to enhance the strength of door panels,1.0mm thickness, 80mm height, with the bars the door can against the Hurricane

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SHENZHEN HONGFA AUTOMATIC DOOR CO., LTD , https://www.hongfafrs.com