Gold bromide

Brom-benzol, n. bromobenzene. calcium, n. calcium bromide, -cyan, n. cyanogen bromide, bromocyanogen. -dampf, tn. bromine vapor, -eisen, n. iron bromide, -fiasche, /. bromine bottle, -fluor, n. bromine fluoride, -gehalt, tn. bromine content, -gold, n. gold bromide, -goldkalium, n. potassium auri-bromide, potassium bromoaurate. bromhaltig, a. contaim ng bromine, Brom-hydrat, n. hydrobromide bromine hydrate. -hydrin, n. bromohydrin. 

Along the same lines it was advocated that colors be read at the absorption maximum rather than at some other convenient point. An example of this is the increase in absorbance one obtains when analyzing for bromide by means of gold chloride (18). As can be seen from Figure 14, the peak with gold bromide increases by a factor of more than 2 when the color is extracted into octanol and read at its absorption maximum (18). 

The gold bromide complex is orange-yellow, the A.n,ax being at 380 nm (e = 4.8-10 in DIPE a = 0.024). The method is selective and simple. KBr and H2SO4 can be used instead of HBr. Ethyl acetate is a suitable alternative to DIPE as the solvent. 

Various types of ion-exchange resins as well as activated carbon were studied to recover the gold bromide and findings are presented in this paper. Furthermore, this paper is concerned with investigating the possibility of re-oxidizing free bromine from bromide for recycling in the process which is vital for the economic viability of this process. Finally, the paper refers the process model constructed based on this study. 

Table 1 Adsorption of gold bromide on strong-base resin, A-500...

Table 2 Adsorption of gold bromide on weak-base resin, Aurix 100...

Table 4 Adsorption of gold bromide on ion-exchange resins and fiber...

Caustic cyanide elution of gold bromide from weak base resin and activated carbon was conducted in a water jacketed glass column. The elution conditions and results are presented in Table 5 and profiles are shown in Figure 1. 

A different method, a shaker table, was used to elute the gold bromide from resin and carbon with thiosulphate solution. The testing conditions and results are presented in Table 7. 

The data in Table 7 suggest that thiosulphate was unable to elute gold bromide from A-500, strong-ion exchange resin but was successful to solubilise about 80% of gold bromide off the carbon. This option should be further explored in search for non-cyanide eluant for gold bromide loaded carbon. 

In order to demonstrate that the adsorbents perform the same way as in the case of synthetic gold bromide solution, the actual leach products were produced and used to create adsorption isotherms for both resin types and activated carbon. Furthermore, the filtrates of isotherm products... 

Reid, K., Mensah-Biney, R. 1988. Gold bromide loadings characteristics on selected adsorbents. Randol. Perth gold 88. Pp 306-309. 

Reaction with dialkyl gold bromides 4, 2.8.5 CsH,W h- CsHjWH,... 

Reagent Solution of 0.36 g platinum bromide and 0.60 g gold bromide in 10 ml water... 

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