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Cyanide Gold Mining

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by

Ashraf Arab

on 8 December 2014

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Transcript of Cyanide Gold Mining

Cyanide in Gold Mining
Video of cyanide in gold mining.
By: Alfarouq and Ashraf


Chemical Reactions
Pre Washing allows all chemicals to efficiently complete the reaction. Gold is not pure when it is found/Mined so pre washing will get rid of most unwanted chemicals.
PRE WASHING
4 Au + 8 NaCN + O2 + 2 H2O → 4 Na[Au(CN)2] + 4 NaOH
CN-
Consuming cyanide
will make you dead

like this rock

except rocks aren't alive to begin with
Rock is confused
2 [Au(CN)2] + Zn → 2 Au + Zn(CN)2 + 2 CN
CN+ [O] → OCN
OCN+ 2 H2O → HCO + NH3
The Environment
Alternatives
ALPHA-
Cyclodextrin
Other possibilities
-thiosulfate (S2O32-)
-thiourea (SC(NH2)2)
-iodine/iodide
-ammonia
Environment
Poisonous
-hydrogen cyanide
-wildlife sensitivity
-doesn't bio magnify
Leaching into ground water
and spills
Cyanide Spills
-Changes caused by
cyanide spills
The problem
-Safety
-Government

Health issues:


Liquid Cyanide :

Solid Cyanide:


CYANIDE IS BAD !!!













HEALTH & SAFTEY HAZARDS

Safety Hazards
Extra equipment is required when working with cyanide.
Isolate the Cyanide from other liquids or chemicals
-A starch
-Discovered by accident
- Here the Zinc precipitates the gold out from the gold cyanide solution. You will be left with Zinc Cyanide and gold also some excess cyanide.
Au(CN)2
In this formula the cyanide is oxidized to form OCN
water is then added to form Bicarbonate and Ammonia
Agenda:
Introduction:
What is cyanide?
How is cyanide formed?
Where is cyanide used?

Video (2):
Gold and cyanide in the mining Industry
:
Gold and cyanide in the lab.

Chemical Formula
and Reactions:
Leaching Process

:
extraction Process

:
Remediation Process

Health and Safety:
Effects on Human

:
Symptoms

:
Solutions

Cyanide and The environment:
Effects on animals and Nature
Solutions

Alternatives:
Different chemicals

Conclusion:
Pros and Cons.


What is Cyanide?
types of cyanide?

and where is it used?
Cyanide is:
A salt of hydrocyanic acid
A poison
A polyatomic Ion
CN-
Mining
Industrial
organic chemistry
Medical uses
Fishing
Pest control
Poisoning

-Carbon and Nitrogen (triple bonded with 4 electrons left with no bond)


The Leaching Process
The Extraction
Process
The Cyanide remediation Process
Gold Cyanide
Here the gold is separated from any other metal or chemical and is then leached into cyanide to form gold cyanide ------> Au(CN)2
The Leaching Process
The Extraction Process
everything is starting to make sense now :D
The cyanide Remediation Process
OCN+ 2 H2O → HCO + NH3
Cyanide can cause respiratory and circulatory issues it will cause lifetime defects in the nervous system
Symptoms - Cyanide Poisoning

-Itchy or burning eyes
-Nausea and vomiting
-Headache or a seizure
-Rapid breathing, restlessness, or confusion
-Weakness, dizziness, or you faint
-Very fast or very slow heartbeat
-In some occasions death
MLA and APA references
Bibliography
Boyle, Rebecca. "Cornstarch Replaces Cyanide In Clean New Gold Extraction Method."Popular Science. N.p., n.d. Web. 11 Feb. 2014. <http://www.popsci.com/science/article/2013-05/cornstarch-replaces-cyanide-clean-new-gold-extraction-method>.
"CSIRO." Sustainable and Cost Effective Gold Recovery. N.p., n.d. Web. 11 Feb. 2014. <http://www.csiro.au/Organisation-Structure/Flagships/Minerals-Down-Under-Flagship/Processing/Project-gold-without-cyanide.aspx>.
Cyanide Handling: university of Melbourne. University of Melbourne, 23 Feb. 2013. Web. 11 Feb. 2014.
Faculty of Science : School of Chemistry Safety." Working with Cyanide: The Treatment of Cyanide Poisoning and Disposal of Cyanide Residues : Safety : School of Chemistry : University of Melbourne. N.p., n.d. Web. 11 Feb. 2014
"Gold Cyanidation." Wikipedia. Wikimedia Foundation, 02 Nov. 2014. Web. 11 Feb. 2014. <http://en.wikipedia.org/wiki/Gold_cyanidation>.
"Gold Mining and the Environment." Brilliant Earth. N.p., n.d. Web. 11 Feb. 2014. <http://www.brilliantearth.com/gold-mining-environment/>.
health and saftey : Centers for Disease Control and Prevention. Centers for Disease Control and Prevention, 18 June 2013. Web. 11 Feb. 2014.
"The Haber Gold Process." Haberinc., n.d. Web. <http://www.habercorp.com/assets/media/pdfs/hgp.pdf>.
"Zinc Cyanide." Wikipedia. Wikimedia Foundation, 02 Oct. 2014. Web. 11 Feb. 2014. <http://en.wikipedia.org/wiki/Zinc_cyanide>.


Hydrogen Poisoning

Electron Transport Chain ETC
Other Possibilities

thiosulfate (S2O32-)
Potassium chloride
Ammonia
Alpha-cyclodextrin
-iodine/iodide
-ammonia
Pros

vs
Cons
Fe + 3CN --> Fe(CN)3
H + CN --> HCN
Pros
:
Cheap
quick
can be reused
easy to transport
Cons
:
Health risks
Environmental risk
Usually a lot of cyanide is needed
Full transcript