Russian direct metal smelting equipment
Equipment use:
For refractory precious metal tailings or slag, the recovery rate
of traditional cyanide gold extraction method is often lower than
80%, so it must be pre-treated before cyanide gold extraction to
open the sulfide envelope or eliminate the factor of gold leaching
rate, so that it can be easily cyanide leaching gold. The furnace
adopts roasting method to decompose the sulfide in the slag, so
that the gold grains are exposed to form loose porous calcine,
which is easy to cyanide leaching gold.
Advantages: The use of DC furnace high temperature arc direct
melting enrichment gold extraction process, direct fire melting
under appropriate conditions, so that gold and silver and other
precious metals concentrated in the smelting products, and then
selective blowing further enrichment of gold, and finally achieve
deep enrichment of gold.
The process is simple and the treatment cost is low, which is the
most common pretreatment method for extracting precious metals from
tailings or slag.
Equipment technical features:
Using the technical characteristics of DC plasma furnace melting
and efficient recovery of precious metals from Taizhuo Company in
Britain, the recovery rate of precious metals is greatly improved.
The DC electric furnace has the following advantages:
1) DC electric furnace electrode center temperature up to 3000C,
heat concentration, continuous smelting is more suitable for high
melting point of rare metal smelting recovery. This technology has
been successfully applied to foreign precious metal recycling
projects for nearly 20 years, and has been successfully put into
use in China's Guiyan platinum industry.
2) The DC electric furnace has a low flicker effect and noise,
which is very beneficial to the power grid and the operator, and
its flicker effect is only 50% to 70% of the AC electric furnace,
and the noise during submerged arc operation is more than 20dB
lower than that of the AC electric furnace. The natural power
factor is high, and the power factor can reach 0.92~0.94 without
compensation.
3) The power consumption of DC electric furnace is 10% ~ 15% lower
than that of AC electric arc furnace, the electrode consumption is
40% ~ 60% of AC furnace, and the production capacity is increased
by ~ 10% compared with AC electric furnace.
4) Because the operating temperature of the electric furnace is
higher than that of the same type of electric furnace, the overall
structure is consistent with that of the same type of foreign
furnace. The fixed tube type water cooled furnace cover structure
provides an effective gas collection and sealing device for
smelting operation and gas treatment.
5) The whole furnace body adopts the separation method of slag
liquid and precious metal materials, and a slag outlet is set at
the front of the furnace body to discharge slag horizontally, and
the furnace body can tilt forward 35° to pour out materials in the
later period of smelting.
6) Adopt the overall multi-touch bottom electrode mode of the
furnace bottom, which can effectively solve the arc deflection
phenomenon of the DC furnace. The furnace bottom is equipped with a
temperature measuring device to detect the lining of the furnace
bottom in real time.
7) Set up a hanging type plugging machine to open and plug the hole
of the material port to maintain the nitrogen protection atmosphere
in the furnace.
8) Integrated rectifier power supply adopts three-phase full bridge
rectifier device, the AC power supply is rectified into a stable
and reliable DC power supply, which can adjust a wide range of
voltage and is suitable for a variety of material processes. The
rectifier device is cooled by independent closed cooling equipment,
which is safe and reliable.
9) The electrode lifting control adopts Siemens programmable
controller, the actuator adopts German Parker proportional valve to
control the hydraulic cylinder lifting mode, and the voltage and
current double closed-loop control is implemented. The low-voltage
electric appliance uses Schneider components to effectively ensure
the reliability and advanced nature of the equipment.
10) Advanced computer operating system, real-time operation and
operation management of operation process and operation parameters.
