Producer gas: Difference between revisions

From NOWA-CL
Jump to navigation Jump to search
Newer edit →
Created page with "The '''Parkes process''' is a pyrometallurgical industrial process for removing silver and gold from lead. It is an example of liquid-liquid extraction. ==Principles== The process takes advantage of several properties of zinc. # Zinc has low melting (420°C) and boiling (907°C) points # As liquids, zinc and lead are immiscible # Noble metals are much more soluble in zinc than in lead. ==Overview== Zinc is added to liquid lead that contains silver, then th..."
 
No edit summary
Line 1: Line 1:
The '''Parkes process''' is a pyrometallurgical industrial process for removing silver and gold from lead. It is an example of liquid-liquid extraction.
Producer gas is a flammable gas mixture compose primarily of [[hydrogen]] and [[carbon monoxide]].
==Principles==
==Uses==
The process takes advantage of several properties of [[zinc]].
==Primary===
# Zinc has low melting (420°C) and boiling (907°C) points
As a [[fuel]] (fv=)
# As liquids, zinc and [[lead]] are immiscible
==Natural Occurrence==
# Noble metals  are much more soluble in zinc than in lead.
Does not occur naturally under normal conditions./
==Overview==
==Hazards==
Zinc is added to liquid lead that contains silver, then the silver preferentially migrates into the zinc. Because the zinc remains in a separate layer, it is easily removed. The zinc is then dry distilled leaving the silver and gold in the alembic and the condensed zinc in the retort. The process was patented by Alexander Parkes in 1850 and improved upon in 1851 and 1852. Alexander Parkes obtained three patents regarding this process.<ref>{{cite patent|13118|cc=UK|year=1850|title=Improvements in smelting and treating certain metals [...]}}</ref><ref>{{cite patent|13675|cc=UK|year=1851|title=Separating silver from other metals}}</ref><ref>{{cite patent|13997|cc=UK|year=1852|title=Separating silver from other metals}}</ref>.
* Asphyxiant
 
==Production==
==Process==
==Synthesis==
# Melt the [[lead]] containing noble metals to be extracted
It is produced by exposing hydrocarbons or solid carbon to steam at high temperatures:
# Add elemental [[zinc]]<br/>Check: The zinc should rise to the surface and form a pool atop the lead
* {{#Chem: C(s) + H2O9(g) = CO + H2}}
# Agitate or merely wait for long enough that the noble metals will migrate into the zinc pool
* {{#Chem: CH4 + H2O = CO + 3H2}}
# Pour off the zinc-noble-metal fluid
[[Category: Crude Mixture]]
# Distill the zinc out of the zinc-noble-metal fluid
==See Also==
* Cupellation
 
==References==
<references/>
[[Category:Processes]]

Revision as of 01:58, 26 March 2025

Producer gas is a flammable gas mixture compose primarily of hydrogen and carbon monoxide.

Uses

Primary=

As a fuel (fv=)

Natural Occurrence

Does not occur naturally under normal conditions./

Hazards

  • Asphyxiant

Production

Synthesis

It is produced by exposing hydrocarbons or solid carbon to steam at high temperatures:

  • {{#Chem: C(s) + H2O9(g) = CO + H2}}
  • {{#Chem: CH4 + H2O = CO + 3H2}}
Retrieved from "http://nowa-cl.com/index.php?title=Producer_gas&oldid=2526"