Improvement of roasting of gold-arsenic concentrate (2)

November 15, 2019

As the amount of remaining air increases, the sublimation rate of arsenic decreases, and the desulfurization effect is also improved. When the air consumption is 0.75 lower than the theoretical requirement , the arsenic content in the slag is high.

When the baking temperature is 550~ 650 Â°C At the time, the sublimation rate of arsenic is the largest (see Figure 3 ). When the temperature is lower than 550 Â°C When cinder still leaves a large number of non-oxidized arsenic pyrite.

From the data of FIG. 4, the firing temperature of the sulfur removal with a - fixed effect and the decisive factor is the air consumption (see FIG. 3 and FIG. 4).

The increase in arsenic content in the slag (see Figure 4 ) demonstrates that arsenic is not sublimed in the second stage of calcination, and the arsenic concentration in the slag is increased.

The relationship between the quality of the slag and the rate of loading the concentrate into the roaster is shown in Figure 5 . It is seen in Figure 5, the first unit processing ability of a roasting furnace of 7.0 to 9. 5 tons / square meter Â· day and night, the second roaster is 3.5 ~ 4.7 tons / square meter . The results obtained during the day and night are better.

The following process regimes were identified during the semi-industrial test:

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Paragraph I Â Â Â Â Â Â Â Â Â Â Â Â Â Â Paragraph II

Boiling layer temperature Â°C Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 550~600 Â Â Â Â Â Â Â Â Â Â Â Â Â 650~675

Excess coefficient of air, a Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.75~1.0 Â Â Â Â Â Â Â Â Â Â Â Â Â 1.5~2.0

Gas flow rate in the boiling layer, cm / sec Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.1~0012 Â Â Â Â Â Â Â Â Â Â Â Â 0.10

Day and night processing capacity, tons / square meter, Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 7.0~9.5 Â Â Â Â Â Â Â Â Â Â Â Â Â 3.5~4.75

Under this process condition, the As is obtained. Â Â 0.19~0.6% and S 0.9~l.3% of slag.

According to the above process conditions, eight day and night balance tests were carried out on the continuous operation of the roasting apparatus (see table).

Metal balance calculation results show that the error is balanced in the metal are within an error range of the chemical analysis permitted. A large amount of gold ( 79.8% ) is enriched in the calcine, while the remaining gold remains in the soot of the dust collection equipment. Gold is not lost with gas.

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