Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering

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Zink separation (5 replies)

G
GP
6 years ago
GP 6 years ago

Hi,

pls share your opinion on how to separate Zink from  blast furnace gas filtration slurry. Target to reduce Zn content from 2,2 to at leas 0,8%. Below chem composition of the slurry.

SiO2 - 8,54%

Al2O3 - 7%

Fe2O3 -51,3%

CaO - 9,45%

MgO - 2,96%

Zn - 2,25%

Will appreciate greatly

b
Robert
6 years ago
Robert 6 years ago

A few related questions:

  • is the zinc liberated or, for example, does it exist as coating on other materials
  • what form is the zinc present in - metallic zinc or as mineral(s)
K
KPvanderWielen
6 years ago
KPvanderWielen 6 years ago

The assays only tell you the Zn is there, a liberation study would be required to find what it is associated with, if it is recoverable etc. Water analysis on a filtered sample would also be quite useful.

Once this is done you at least know what your goal posts are.

A
Rheomet
6 years ago
Rheomet 6 years ago

It could be tough to break because the zinc could be tied as Silicate  or alumino-silicate or both, only oxide would be nice Before spending money on mineralogy, why not try to leach with ~ 250 g/L NaOH, 1.5 hours, 90C (don't forget to add the evaporated water). See what you get.  You need at least 80-90% extracted in solution to eventually worth it, since you will need to recover the zinc from the pregnant leach solution. Luckily zinc price attractive, so now it seems the time to do it. Good luck.

M
BAUD
6 years ago
BAUD 6 years ago

-The  sum of the contents is 81.5 %. Please, what about the 18.5 % missing?

-What is your goal: to extract Zn or to decrease the Zn content in the concentrate?

r
RayMartin
6 years ago
RayMartin 6 years ago

Known method is leaching with hydrochloric acid. Typical concentration would be 5M.  Separation of leached material using a filter press.

If recovery is not an issue, you can separate the dust before leaching using hydrocyclone.  The Zn tends to be concentrated on the finer particles because the zinc compound was deposited on the surface during formation.

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