The recovery of gold from complex gold - arsenic feedstocks depends to a large extent on the complete degree of arsenic removal at the beginning of the process. Vacuum is arsenic removal from fumed refractory sulphide concentrate A method in most promising.
This paper describes the results of industrial tests on flotation concentrates and re-election concentrates at a deposit in Siberia. These tests were carried out in a continuously operating vibrating vacuum pyrolysis apparatus under industrial production conditions. The vacuum pyrolysis unit was jointly developed by the Kazakh Academy of Mineral Processing , the National Institute of Rare Metals and the Central Asian Nonferrous Metals Scientific Research and Design Institute.
The composition of the concentrate used in the test is as follows: ( % )
             As       Fc       Â
Flotation concentrate  1.8       6.50      5.09      45.54     0.28      12.66    -      16.7
Re-election concentrate  15.9      35.66    32.44     8.52    0.71      1.78         1.0     4.85
Vacuum pyrolysis treatment of flotation concentrate
The particle size composition (grain size, mm) of the flotation concentrate is as follows, % : +2.5-6.81 ; -2.5+1.6-5.5 ; -1.6+0.63-4.4 ,; -0.63+0.4-4.2 ; -0.4+0.315-15 ; -0.315+0.20-2.8 ; -0.2+0.16-4.6 ; -0.16+0.1-21.8 ; -0.1+0.063-21.7 ; -0.063+0.05-11.6 ; -0.05-15.1 .
False weight
At a temperature of 650~
The yield of the slag is 78.2% of the concentrate , and the arsenic content is 0.17~.28% .
The particle size composition (grain size, mm) of the slag is as follows, % : Â +0.63-1.8 ; -0.63+0.4-1.4 ; -0.4+0.315-1.2 ; -0.315+0.2-1.3 ; -0.2+0.16-2.2 ; -0.16+0.1-17.1 ; -0.1+0.063-36.9 ; -0.063+ 0.05-17.6 ; -0.05-20.5 .
False weight
Vacuum pyrolysis process, the concentrates subject to a degree of milling and osteoporosis. The material balance in the treatment of flotation concentrates and the distribution of arsenic in different products are listed in Table 2 .
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