Waste Copper/iron Recycling to Copper /iron Sulfate Equipment Waste copper treatment
In accordance with the quality requirements of recycled products, waste copper treatment, can be divided into fire smelting and electrolytic smelting. Production of coarse copper and copper alloy, the general use of fire smelting, and the production of electrolytic copper electrolytic smelting. The most commonly used fire treatment of waste copper is not prepared for the rotary kiln, also known as the drum furnace or drums.
The furnace consists of a horizontal cylinder with a tapered end at both ends. One end of the installation of gas, fuel or coal as fuel combustion nozzle, the other end for the charge into the charge. The discharge hole is located at the center of the side wall similar to the converter. The shaft is rotated by the horizontal axis and continuously rotated during operation to ensure that the heated lining is in complete contact with the charge. The capacity of the rotary kiln is between 50 and 6000 kg. Melting speed, low melting loss, the production of metal copper gas content is small, and the composition and temperature uniformity. The entire smelting process low energy consumption and complete control of temperature and atmosphere. The disadvantage is because the pool is shallow, should not use inert gas purge, it is not easy to quickly add new charge, and can cause serious air pollution. Now, this kind of stove has been used for the pre-melting of waste copper in order to send into the refining furnace smelting.
Cupola uses low sulfur, low ash coke can also be smelt brass, but because of the oxidizing atmosphere and zinc volatilization, process control difficult. Crucible boiler is smelting, small batch products, the most simple smelting device, in 30 ~ 120min can melt 100 ~ 500kg brass. The crucible boiler consists of a small vertical cylindrical chamber, which is directly transferred to the crucible by direct flame, resistive element or induction coil, which consists of graphite, carbon brick or other refractory material, which is suitable for smelting Small batch of alloy for the artistic creation of copper products.
In direct electric arc furnace, indirect electric arc furnace, induction furnace three types of electric furnace, direct electric arc furnace or submerged arc furnace due to arc temperature is too high, the composition control difficult, can not be used for melting alloy; indirect electric arc furnace can only be used for small casting ; The most suitable for dealing with waste copper furnace for the induction furnace, especially the coreless low frequency induction furnace. This furnace is tunnel-shaped or crucible, as shown in Figure 1-16. The furnace body consists of a cylindrical lining of refractory material melting chamber and its surrounding water cooling coil. Induction current directly in the furnace melting furnace charge. Different from the core furnace, this furnace can be filled with cold metal charge, so in practice mainly used to smelting waste copper. The specifications of the stove are 75 ~ 700kw variety, the capacity ranging from several kilograms to several tons. Waste copper electrolytic smelting of the main equipment for the electrolytic cell. To coarse copper as the anode, fine copper rod for the cathode, the electrolyte using dilute sulfuric acid.