Calcination method of Jatylo Neff arsenic gold ore (4)

The ratio of bag air collector to filter cloth is 1.9 cubic feet / min·square feet are considered to be relatively low. The vibration mechanism of the bag today is that the pressure drop at both ends of the baghouse reaches 2 inches Working on the water column, the direct result is that the vibration frequency is reduced from 32 weeks per day to 4 weeks. Currently arsenic trioxide dust bag in effect - the edge, as a filter medium can be gathered together, bonded to each other such dust filtration and the vibration frequency of the bag filter of the collector efficiency has been significantly improved.

Table 4   Bag dust collector working system

Working system

Before 1977

Head      before

temperature

230 o F

220 o F

Bag vibration period

Timing vibration every 45 minutes

Vibration when pressure is reduced

Vibration frequency

32 weeks / day

4 weeks / day

Filter media

Oryo Full Fiber Bag

De Lei Long 32 bags

Chimney arsenic emissions (mg /Scm )

75~25

6~10

Arsenic (lbs / day)

273~760

16~20

Average grade of bag dust ( % by weight )

As

As 2 O 3

Fe

Sb

Au (oz / ton)

65~72

85~95

1.0~2.5

0.3~0.7

0.10~0.15

The average dust collection efficiency is 99.85% .

Filter media

Bag filter initially uses Aoer You - the (kind of synthetic fibers made of acrylonitrile polymers) as a filter medium, the filter bags are made with a variety of different materials have been extensively studied, selected splashed Ritter Sri Lanka (porrltts) and Lisbon plug (speneer) German base 32 Long filter media, such bags has proven its use is very reliable.

A variable-speed pneumatic exhaust fan delivers the exhaust of the purified baghouse into a chimney 9 feet in diameter and 150 feet high . The standard analysis results of chimney gas are as follows:

1.25% SO 2 , 19.9% ​​O 2 , 78.5% N 2 and 0.1% C0 2 , dry molecular weight is 29.4 pounds / lb.

Treatment of recycled arsenic trioxide:

Each bag filter - Average days recovery 15 tons of soot, dust bag typical analysis of such a result (wt%): 85 ~ 95As 2 0 3, 1.0 ~ 2.6, 0.3 ~ 0.7Sb and 0.1 ~ 0.15Au ( Ounces / ton).

In the past few years, bag dust has been transported by pneumatic transport to specialized underground warehouses in permafrost, which are used to store As 2 O 3 dust. After the excavation of the silo is completed, a concrete partition is installed to prevent any stored material from being removed from the silo. Before the bag dust is placed in the silo, there may be some - part of the dust returning to the ground through the formation. Use a pneumatic conveyor to press the wind to bring the dust from the underground into the dust collector inlet duct.

Today, the market for arsenic trioxide in North America has improved, and arsenic trioxide products have turned from loss to profit.

At present, bag dust is transported by wind to a 15,000- cubic-foot cylinder silo, which is then transported to a refinery in the southeastern United States with a 1,500- cubic-foot car. In order to prevent dust leakage during loading into the cylinder silo and loading into the car, the silo and the car's charging are operated under negative pressure (loading) behind the belt dust collector population duct.

Conclusion

Due to the continuous development of gold production, metallurgy and environmental protection in order to meet the requirements, the husband of mine for many years贾特耶洛奈Ltd. sulfide ore concentrate roasting and flue gas cleaning systems there has been progress in combination. The efficiency of the gas purification system has been improved by retrofitting existing equipment. At present, the market for arsenic trioxide in North America has expanded, making the treatment of bag dust have turned from loss to profit.

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