Technical operating conditions and technical indicators of zinc replacement

Jinchangyu Gold ore dressing plant belonging treated quartz veins containing a small amount of pyrite ore, gold ore grade 4 ~ 6 grams / ton, using flotation - concentrate cyanide - zinc replacement process, concentrate containing gold 115 ~ 130 grams / ton.

1. Zinc wire replacement production practice    The precious liquid is initially purified by a sand filter box, and after removing some of the slime, it is pumped into the precious liquid pool and clarified in the pool. The clarified liquid is fed to the displacement tank and reacts with the zinc wire in the tank. Technical operating conditions and technical indicators:

Liquid flow:                  180 meters ³ / day;

CN ^- concentration:                                     0.05 ~ 0.06% ;

CaO concentration:                                         0.03% ;

Zinc wire consumption:                                     240 grams / m ³ ;

Lean liquid contains gold:                             0.1 5 ～ 0 .20 g / m ³ ;

Replacement rate:                  99. 0 ~ 99.5% .

Thickness of zinc wire 0.2 mm ,width 2 mm Containing 0.1% lead. In the production, zinc wire is added to each shift, and the replacement cycle is one month. The extracted gold mud is manually washed and filtered by a vacuum filter, and the filter cake contains about 30% water.

2. Zinc powder replacement production practice    Purification uses a plate and frame vacuum filter. Vacuum deoxidation tower for deoxidation, specification Ñ„ 1000 × 3500 mm, equipped with ZBA-60 hydraulic jet pump vacuum device. The replacement machine uses a BMT ²⁰ / ₀₃₅ × 25 plate and frame filter press. Operating technical conditions and technical indicators:

CN ^- concentration in the noble liquid:      0.04 ~ 0.05% ;

CaO concentration:            0.02 ~ 0.03% ;

Pb ) (Ac) ₂ concentration:                  0.0032% ;

Suspension concentration:         10 ~ 20 grams / m ³ ;

Vacuum degree :              700 to 720 mm · Hg;

Oxygen content of deoxidizing solution:                  Less than 0.25 g / m ³ ;

Zinc powder dosage:                       80 grams / m ³ ;

Noble flow:                      200 ~ 220 ^m3 ;

Your liquid contains gold:           10 ~ 18 g / m ³ ;

Replacement rate:             99.87 ~ 99.90% ;

Gold mud gold grade:                     15 to 20% .

3. Comparison of economic indicators of zinc powder and zinc wire replacement technology    Comparing the technical and economic indicators of the above two zinc replacement methods, the replacement rate of the zinc powder method is higher than that of the zinc wire method; the production is low; and the amount of zinc powder replacement gold mud is small, the fire smelting cost is low.

High accuracy, full penetration welded, sealed construction with three parts welded can be used for in marine project, is able to float.