The company is located in the Kizilkum Desert in Uzbekistan. Mu Lung Tao gold ore processing plant area called Zhala Fu Shan. The gold mine has been expanded four times since it was put into operation in 1969. The current production capacity is 50,000 t/d, and the annual output of gold is 80 t, accounting for about one-third of the Soviet production. The noble metal precipitate is calcined and dissolved with nitric acid to separate gold and silver. For the dissolved silver, hydrochloric acid is precipitated in the form of AgCl, and then a series of treatments are carried out to obtain a silver ingot, which is calcined for a higher grade gold mud plus flux, and is made into a crude gold nugget and electrolytically refined in a HCl-HNO 3 medium. The cathode and anode plates are of titanium, gold crude hung on the anode and packed together in plastic bags to collect the gold fallout during dissolution. The gold is continuously dissolved and deposited on the cathode to be purified, and finally smelted to obtain a high-purity gold ingot (coloring up to 999.9%). During electrolysis, the solution in the tank is reduced by evaporation, and water is added to maintain the liquid level and acidity. When the content of impurities in the electrolyte exceeds a certain concentration, it is precipitated together with the desorbed product liquid as an electrolytic tail liquid. Tungsten Carbide Spiral Strips Spiral Strips,Tungsten Carbide Helix Strips,Tungsten Carbide Helical Strips,Tungsten Carbide Spiral Strips Zhuzhou Jingfeng Carbide Tools Co., Ltd , https://www.zzjfcarbide.com
1) Mining Open pit mining has now been carried out to a vertical depth of up to 200m. The ore is silicified shale , all of which are oxidized ore. The ore contains SiO 2 70%, Au 0.5~10g/t (generally 3~5g/t), Ag is about 1/10 of Au, and a small amount of tungsten and trace amount are recycled as much as possible in the process. In the mining process, the activation analyzer was used to quickly measure the gold content of the mine samples in order to distinguish the waste rock from the ore and the high or low grade ore to guide the mining. Mining does not require blasting, it is directly produced by the excavator and loaded into the truck.
2) Broken and re-selected The cone crusher for crushing , the power is 600kW, the degree of ore is not more than 2000mm, the size of the ore is not more than 160mm, and the production capacity is 2000t/h.
Grinding is multi-system grinding. It adopts two-stage closed-circuit wet grinding method. The first section adopts Ф7m semi- auto-grinding machine with a volume of 80m 3 , a steel ball of 60~100 mm and a discharge particle size of -35mm. The second stage uses a ball mill with a discharge size of -200 mesh and 80%. The semi-autogenous mill and the ball mill are combined with a double spiral classifier, respectively. A re-selection device such as a jig and a shaker is arranged between the two sections of the mill to re-elect the ore. The overflow of the spiral classifier of the two-stage mill is sent to the thickener.
3) The slurry is thick. The thickener is Ф50m peripheral transmission type, and a total of 6 units are operated in parallel. Add lime milk to the ball mill and thickener to adjust the pH. Polypropylene guanamine was added to the center tube of the thickener at a dosage of 15 g/t to promote flocculation and sedimentation of the slime. The bottom of each thickener enters a storage tank, and a slurry pump with a capacity of 3000m 3 /h is sent to the distributor, where it is mixed with the infusion agent NaCN solution supplied by the automatic feeder, and then evenly distributed to 8 pre-cyanide. Chemical and pulp leaching adsorption lines.
4) Pre-cyanide and leaching-adsorption systems for pulp The Pachukata is used in eight production lines for pre-cyanide and resin slurry adsorption and leaching. The specification is Ф5m×25m. The single tower has a volume of 500m 3 . Each production line consists of 12 towers arranged horizontally in series and air agitated. The first 3 towers are pre-cyanide towers, and the last 9 towers are resin slurry adsorption leaching towers. Each adsorption leaching tower is equipped with 8 square sieves with an area of ​​1m 2 and a sieve hole of 0.4mm. It is installed at the top of the tower and arranged on two sides. Each side has 4 blocks, which are inserted obliquely into the tower and the screens on both sides. The opening angle is about 140, and each screen can be taken out separately to check for damage.
In the resin slurry adsorption leaching system, both the slurry and the resin flow continuously, and the two are countercurrent. Compressed air is used for the circulation of the slurry in the tower, the separation of the slurry from the resin, and the promotion of the resin. [next]
Pre-cyanide and adsorption leaching indicators: NaCN dosage 300g / t, pH 10.5 ~ 11.5, pre-leaching time 4 ~ 6h, pre-dip and adsorption leaching a total of 16 ~ 18h, pulp oxygen 6 ~ 7mg / L, resin AM- 2Б input amount is 1% of pulp volume, particle size is 0.5~1.2mm, resin capacity is 6~10mg/g per gram of dry resin, tailings contains gold 0.18~0.2g/t, tailings liquid phase contains gold concentration 0.02 ~0.05mg/L, the total loss of resin is 10g per ton of mine, and the average service life is 4 years. The screen passing capacity is 80~100m3/(m 2 ·h), the air consumption is 0.05~0.1m3/(min·m 3 ), and the remaining CN - concentration is 100mg/L.
5) Desorption and regeneration of gold-loaded resin The desorption of gold-loaded resin and the regeneration of resin-depleted resin are carried out in 9 steps and 25 towers. The specifications of these towers are Ф2m×12m, lined with rubber and ceramic tiles. The resin enters from the upper part of each tower, and then rises from the lower part of the tower through the central riser in the tower to realize the transfer of resin between the towers. The resin time of the tower is 1~2h. Various solutions were added from the bottom of the column and flowed from bottom to top. It must be pointed out that the total desorption time of the enterprise is 180h, the gold concentration of the finished liquid is 0.5~1.0g/L, the silver is 8mg/L, the residual gold capacity of the recycled resin is less than 0.1mg/g, and the consumption per ton of ore is Thiourea 20g.
6) Desorption of the finished product liquid and purification and refining of the gold. The joint venture does not use the electrolysis method commonly used in the Soviet gold extraction industry. The process flow is as shown in the figure, and the precious metal is recovered from the thiourea-sulfuric acid product desorption liquid. Precipitation method, the acidic desorbed product liquid is added to the base at 50~60 °C to pH=11, so that gold, silver and bismuth metal are precipitated, so that the precious metal is recovered on the one hand, and the desorbed liquid is purified on the one hand to adjust the composition. Return to the desorption process to use. 