Pulverized coal ash
Equipment use:
Mainly used for the treatment of fly ash, the utilization rate of
traditional arc heating method is often less than 80%, so the
furnace adopts high pressure plasma arc direct breakdown to
pretreat it, greatly improve the efficiency of plasma arc, and
provide molten materials for the subsequent electrolytic process.
Advantages: The process of direct melting of breakdown materials by
high temperature plasma arc in DC furnace meets the appropriate
conditions for direct ion breakdown melting.
The process is simple and has high efficiency. It is a pretreatment
method for large quantities of molten ash reaction.
Equipment technical features:
The plasma furnace melting technology features efficient recovery
of precious metals, so that the recovery of precious metals greatly
improved, the DC electric furnace has the following advantages:
1) The temperature of the electrode center of the DC electric
furnace is as high as 3000-5000C, and the heat is concentrated, and
continuous smelting is more suitable for rapid and large amount of
fly ash smelting.
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 the front of the furnace
body is provided with a horizontal slag outlet, and the furnace
body is fixed.
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 two hanging type eye plugging machines to open and plug
the eyes of the slag mouth and iron mouth to maintain the
protective 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 DCS computer operating system, real-time operation and
operation management of the operation process and operating
parameters.
Equipment structure description:
1.Furnace body
The furnace body is divided into two parts: the upper shell and the
lower shell.
2. Furnace cover
The furnace cover is cooled by tubular water
3. Electrode lifting device and electrode cross arm
The electrode lifting device consists of an electrode cross arm and
a column
4. Furnace tilting platform
The tilting platform of the furnace body is an integral welded
structural part
5. Short-net system
The short network system is connected by the copper bar at the
secondary outlet end of the electric furnace transformer
6. Hydraulic system
The hydraulic system is composed of hydraulic pump device,
accumulator, control valve group and other components
7. Cooling water system
The cooling water system consists of pressure gauge, thermometer,
butterfly valve and water dispenser
8. Storage system and pneumatic conveying system
9. Iron ladle, slag device
The iron and slag are directly opened by plugging machine, and the
alloy is opened by hanging type.
