Boiling roasting method for processing gold arsenic ore abroad (3)

The concentrate slurry is fed into the No. I furnace. 60 tons of concentrate are processed every day and night , and solids in the pulp account for 80% .
The temperature fluctuation of the boiling layer in the No. I furnace is 560~ 590 °C between. The furnace temperature is adjusted by changing the feed rate.

If the composition of the gas phase can be controlled in the furnace No. I , the arsenic can be completely discharged. This will fully dissociate the gold , and after the next - stage cyanidation, the recovery rate of gold can be greatly improved.

Calcine is discharged from the calciner I, along the weir and to calcine the discharge pipe through the lance into the calciner. â…¡ feeder. The dusty gas in the No. I furnace enters the dust collector and is then fed into the No. II furnace.

The external size of the No. II roaster is 4.27 × 4.88 meters , the diameter of the boiling zone is 2.7 meters The boiling layer height is 915 mm. The bottom of the furnace is equipped with 90 nozzles with ball valves.

The temperature of the boiling layer in the No. II furnace is 650~ 760 °C . In order to make the temperature inside the No. 2 furnace not exceed 760 °C Water should be sprayed into the furnace regularly. No. Ⅱ furnace stopped each year - twice the furnace. The shutdown time is 36 hours for inspection.

The dust-containing gas discharged from the No. II furnace was fed into three dust collectors. After the gas is purified by the dust collector, it passes through 42.3 meters The chimneys of high and inner refractory bricks are crowded with atmosphere.

The dust discharged from the dust collector is fed into the fire extinguishing tank below. The calcine in the No. II furnace and the dust in the precipitator should also be subjected to cyanidation after being subjected to a cyanidation process after extinguishing the fire.

When re-using the roaster after a long period of shutdown, the petroleum burner should be switched on first to bring the boiling layer temperature to the working limit. I, and then to feed the furnace and to gradually increase the boiling temperature of the layer. The calcine discharged through the weir is fed into the No. II furnace. In general, it takes about 36 hours to feed and bring the two furnaces to the specified height . When entering the flotation concentrate from the furnace. â…¡ I, furnace, can reduce the arsenic content in the calcine to 1.5 to 1.6%. This will ensure that the gold recovery rate during cyanidation is increased to 97.5% .
Canadian companies use a two-stage boiling roaster with a capacity of 200 tons per day and night .
US beneficiation plant began in 1951 to carry out flotation concentrate sulfur tellurium - segment roasting. Concentrate 310 grams / T Au, 22 ~ 25% S, and 22 to 24% Fe. The roasting equipment process is shown in Figure 3 . Morphology form of gold tellurides (telluride closely associated with pyrite) in the concentrate, a small amount of gold in free state.

The flotation concentrate slurry ( 60% solids ) discharged from the concentrator of the concentrator is fed into the intermediate agitation leaching tank by a diaphragm pump. As shown in Fig. 3 , the slurry discharged from the leaching tank is fed to the disc filter.

The filter cake containing 84~88% solids is fed into the slurry tank, diluted with water to a solid content of 78~80% , and then fed into the 1800 × 1800 mm Stir the leaching tank.

The slurry is fed from the feed tank into the Dow type roaster using a disk pump. The concentrate slurry enters the roaster through the feed pipe. The feeding tube is installed in the opposite direction to the discharge hole and is higher than the boiling level 150 mm . Feed tube diameter 38 mm The end is flattened and twisted downward at an angle of 30 ° into the furnace. In order to concentrate to uniformly into the furnace and the tube cooled during shutdown, by - the root canal to which dedicated to a small amount of compressed air.

This boiling roaster has - high 5 meters ,diameter 5 meters Cylindrical housing. External for furnace 6 mm Made of thick steel plate 150 mm Thick insulation layer and 220 mm Thick refractory brick lining.

Lining to the bottom of the furnace 1.5 meters The height is built into the calcine discharge hole. The total thickness of the insulation layer on the upper part of the calcination discharge hole and the lining of the refractory brick is 125 mm .

Bottom bottom 22 mm Made of thick steel plate, there are 134 holes in the steel plate . The distance between the centers of the holes is 300 mm .

Each hole has a threaded garden, the thread is screwed with a tube diameter 25 mm ,long 228 mm Stainless steel semi-circular top cover. An upper cover having a semi-circular diameter 75 mm ,thick 6.5 mm Steel sheet. There are four equal distances on the wall of the lower part of the steel sheet. 6.5 mm The hole in the garden. The bottom of the roaster is covered with two layers of refractory bricks, each layer being 75 mm . When roasting, the temperature of the boiling layer is 620 °C .

The acupuncture gold ore is dissociated during the roasting process and the fine metal gold is separated. This metal gold is easily dissolved during cyanidation.

The pyrite is oxidized to form porous iron oxide particles. Thus, the cyanide solution can easily penetrate into the gold particles and dissolve it.

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