Desulfurization from refractory gold-bearing concentrates by vacuum pyrolysis and volatilization (1)

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: ( % )

Â Â Â Â Â Â Â Â Â Â Â Â Â As Â Â Â Â Â Â Fc Â Â Â Â Â Â Â S Â Â Â Â Â SiO ₂ Â Â Â Â CaO Â Â Â Â Â A 1O _{3 Â Â Â} Â MgO Â Â Â Â C

Flotation concentrate Â 1.8 Â Â Â Â Â Â 6.50 Â Â Â Â Â 5.09 Â Â Â Â Â 45.54 Â Â Â Â 0.28 Â Â Â Â Â 12.66 Â Â Â - Â Â Â Â Â 16.7

Re-election concentrate Â 15.9 Â Â Â Â Â 35.66 Â Â Â 32.44 Â Â Â Â 8.52 Â Â Â 0.71 Â Â Â Â Â 1.78 Â Â Â Â Â Â Â Â 1.0 Â Â Â Â 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 1.11 grams / Cm ³ (not scattered) and 1.34 grams / Cm ³ (scattered), true specific gravity of the concentrate 2.72 grams / Cm ^3, the natural angle of repose of 48 Â°.

At a temperature of 650~ 700 Â°C And the residual gas pressure is 35~ 100 mm - Under mercury column conditions, it has carried out several tests. The day and night processing capacity of the unit fluctuated between 1 and 8 tons (Table 1 ).

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 0.91 g / Cm ^3, a true specific gravity 2.74 grams / Cm ^3, the natural angle of repose of 50 Â°.

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 .

Gas Water Heater

Gas Water Heater ,Gas Hot Water Heater,Tankless Gas Water Heater,Commercial Water Heater

Guangdong Horisun Co., Ltd , https://www.horisun-group.com