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picture1_Hydrogen Pdf 90311 | 91389 Exp Student4 001


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File: Hydrogen Pdf 90311 | 91389 Exp Student4 001
Exemplar for internal assessment resource Chemistry for Achievement Standard 91389 Extraction of gold using cyanide Gold is found in very low concentrations in the ore from which it is mined ...

icon picture PDF Filetype PDF | Posted on 16 Sep 2022 | 2 years ago

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...Exemplar for internal assessment resource chemistry achievement standard extraction of gold using cyanide is found in very low concentrations the ore from which it mined to collect needs be separated other minerals do this made into a soluble form so that can as insoluble make sodium nacn added and ion forms complex with readily issues toxic animal plant life may cause death if exposed high enough doses free cn hydrogen hcn often gaseous volatile causes cellular asphyxiation process ground crushed slurry treated then has following reaction au now known leaching normally carried out at ph prevents being converted would occur was lower because rest dissolving sometimes some precious metals also leached along example silver done tanks or by heap where dripped onto left percolate its way through dissolved recovered called absorption when species attach solid surface substance activated carbon used absorb formed wood peat coal etc will majority washed water air on screen further purified el...
								

							

						
	
												
				
					
					
					
			
					
				
				
		
	

	
		





	

	
				

						

						
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										Category:  Uncategorized / Uncategorized 
										
Posted on: 16 Sep 2022 | 2 years ago
										
										
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Filetype: PDF
										
File size: 0.30 MB
										
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												Wan learn