4. Characteristics of new solid-liquid separation equipment Conventional solid-liquid separation equipment has plate and frame filter press, belt filter, thickener, and the high-pressure pump of the plate and frame filter press is vulnerable to corrosion and is required to be set before pressure filtration. The mixing tank balances the flow rate, the equipment investment reaches 1.5 million yuan, and the power consumption is large; the belt vacuum filter filter belt is vulnerable, it is not easy to prevent chlorine corrosion, the investment is up to 2 million yuan; the thick machine is not easy to handle large granular materials. It is also not easy, covering a large area, with an investment of 1.5 million yuan.
The new type of solid-liquid separation equipment is similar to the leaching tank for pool dipping. The multi-tank is connected in series. The upper part is provided with an overflow port, and the lower part is provided with a distribution plate. After the slurry enters, the large-sized material quickly settles to the lower part of the pool, and the water-particle material will pass through the discharge. The mouth flows to the pool behind it. After a long period of sedimentation, the clearer liquid flows out of the solid-liquid separation equipment, and enters the adsorption section. After the front tank is filled with the leaching residue, open the distribution plate. The drain valve is washed with water from the upper part of the pool. The precious liquid from the distribution plate also enters the adsorption section. The new equipment is made of concrete and coated with anti-corrosion materials. The investment is only 300,000 yuan.
Advantages of new processes and equipment Advantages of the leaching method:
1. This leaching method uses industrially widely used chlorine gas (starting with a small amount of salt) as a leaching agent and a small amount of auxiliaries to avoid cyanide contamination. The auxiliaries used reduce the consumption of chlorine gas, making the cost of the chemistry lower than cyanide. Method.
2. The leaching time of this method is only 3 minutes, so the effective volume of the leaching equipment is only 0.2% to 0.4% of the cyanidation method. For the factory with a processing capacity of 100t/d, the effective volume of the leaching equipment is only 0.3 cubic meters. Can be reduced by 20%, the power consumption of leaching can also be reduced by 4 ~ 5kwh / t.
Advantages of the new leaching equipment:
The new reactor is used to adapt to the leaching of large granular materials. Conventional leaching equipment is only suitable for the treatment of pulp below 200 mesh, otherwise there will be failures such as "sinking tank" and pressure mixing slurry. The equipment has a small volume and uses other The method solves the reactor problem and avoids uneven mixing.
The new solid-liquid separation equipment has the characteristics of low investment, low production cost, easy corrosion resistance, etc. The existing filtration equipment can not solve the anti-corrosion problem, and the price is very high, about 1 million yuan is needed, and the investment of the new solid-liquid separation equipment is only 300,000. yuan.
Advantages of the new process:
1. Eliminate grinding and corresponding grading and thick equipment, reduce investment by about 40%; save 400 square meters; reduce material consumption by 10 yuan/t; reduce electricity cost by 5 yuan/t; reduce operator 3--6 people.
2. The non-grinding slag itself has a large particle size, generally accounting for more than 70% in -80 mesh, 45% in 40-80 mesh, and the remaining 5% in 20-40 mesh. The sedimentation speed is fast. Especially suitable for new styles. Solid-liquid separation equipment for liquid-solid separation. This equipment is easy to operate. Compared with the cyanidation process, the thickener and filter press are omitted, and it is easy to control the balance of the leachate.
3. The activated carbon adsorption method is used to recover the gold in the leachate. Considering that sediment may be generated during the adsorption process, the patented adsorption tank of our unit is used. The investment of the adsorption unit is only 20,000 yuan.
4. Because the gold chloride complex is adsorbed in the acidic chlorine-containing solution, and the gold ion is finally converted into elemental gold. Therefore, the gold grade on the gold-loaded carbon can be at least 10 kg/t, and the incineration-aqua regia is used. The combined process of reduction can produce pure gold. The smelting process equipment is simple, only using conventional chemicals, compared with the cyanide method, the smelting section saves equipment investment of 300,000 yuan, and the smelting cost is lower than the conventional process.
5. The impurities in the poor liquid are mainly iron , zinc and copper , which can be precipitated with lime. The solution separating the impurities can be recycled; due to continuous chlorine addition, the acidity of the leachate will increase continuously, and the process of adding lime and impurities will also play. Adjust the role of acidity.
6. Compared with the conventional cyanide process, the gold extraction plant with 100t/d processing capacity can save equipment investment of 800,000 yuan and reduce production cost by 30 yuan/t. Those who use cyanidation process have no profit. Is it possible to raise gold at low grade slag? In other words, the economic quality of slag's gold extraction is greatly reduced.
For example, a factory with a processing capacity of 100t/d will invest 60-800,000 yuan. The power supply will not exceed 50kw, and the processing cost will be about 40 yuan/t. Even if the grade of slag is as low as 1.5g/t, the leaching rate is 55%. The profit can also reach 1 million yuan.
There are at least 10 factories with such slag in China, and the gold grade is below 2g/t. If the process is promoted, at least 250kg of gold will be recovered every year. The profit will be more than 10 million yuan.
Process design of sulfuric acid slag gold extraction process 1. Process data 1. Processing capacity: 100t/d
2. Leachate concentration: Chlorine gas 1.5kg/M 3 PH=1.5-2.5 Cl-4kg/M 3
3. Liquid to solid ratio: 2 ~ 5: 1
4. Reaction time: 3 minutes 5. Reaction type: Full back mixing 6. Liquid-solid separation method: new solid-liquid separation equipment 7. Gold recovery method in noble liquid: activated carbon fixed bed adsorption method 8. Lean liquid circulation measure: lime And recycling after precipitation of impurities 9. Gold leaching rate: 55%
10. Waste gas treatment method: Caustic soda liquid adsorption and reuse 2. Raw materials 1. Calcined gold grade: 1.67 g / t
2. Liquid chlorine 3. Lime 4. Activated carbon: wood charcoal or pectin charcoal 5. Tap water 6. caustic soda 3. Material flow 1. Sulfuric acid cinder: 4.17t/h
2. Leachate flow rate: 8.34~20M 3 /h
3. Activated carbon adsorbent dosage: 1t
4. Exhaust gas treatment Exhaust volume: >500M 3 /h
Absorbent flow rate: 2-4M 3 /h
4. Process Flow ┌──────────────────────────â”
↓ │
Screw feeder-→leaching equipment-→separator-→carbon adsorption tank-→lime neutralization→→impurity separation-┘
↑ ↓ │ ↓
│ Waste slag └─────┠Heavy metal └────────────┠↓
│ Roasting chlorine-containing waste gas-→solid-liquid adsorption tower-→sodium hypochlorite solution-— ┘ │
↑ ↓
│ Purification of ingots
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