Cadmium is a recognized highly toxic substance with strong bioaccumulation, teratogenicity and carcinogenicity. However, cadmium is also an important and relatively rare non-ferrous metal with good corrosion resistance and wear resistance. It can form alloys with a variety of metals and has specific functions. In view of the environmental hazards and economic value of cadmium, the comprehensive utilization of cadmium-containing waste can not only turn waste into treasure, obtain certain economic benefits, but also reduce environmental risks, so it has positive practical significance.
The main source of cadmium-containing waste is cadmium-containing slag dust produced during the smelting process of non-ferrous metals such as lead and zinc, followed by waste nickel-cadmium battery waste and other small amounts of cadmium-containing alloys, cadmium-containing pigments, cadmium-containing fluorescent materials and other cadmium-containing wastes. At present, the resource recovery of cadmium-containing wastes mainly targets high-grade cadmium-containing wastes, while low-grade cadmium-containing wastes are not suitable for comprehensive resource recovery due to their low metal content, so the main purpose of treatment is to stabilize and render them harmless.
Process Flow of Rreating Cadmium-containing Waste by Extraction Method
Tiei Extraction uses an extraction process to recover cadmium ingots containing cadmium. The process is: copper-cadmium slag--leaching--extraction--electrowinning--smelting--cadmium ingots. The cadmium recovery rate is 84% to 93%. This process has a high cadmium recovery rate, a short process flow and low energy consumption.
Cadmium Extraction Equipment CWL-M Series Centrifugal Extractor
The wet extraction process can use the CWL-M series high efficiency centrifugal extractor developed and manufactured by Zhengzhou Tiei Extraction. The centrifugal extractor has the advantages of small extraction equipment footprint and large processing flexibility; simple process flow and convenient operation; stable product quality, which can meet different production requirements. The entire wet centrifugal extraction process not only has high extraction efficiency and good extraction effect, but also has low power consumption and energy saving, and the discharge of wastewater, waste gas and waste residue is small. Cadmium is leached, extracted and electrolytically produced to produce refined cadmium, with a direct yield of 87.76%. The obtained raffinate, the incorporated acid water and the incorporated washing water are mixed to form a cadmium-poor solution. Due to the low zinc ion concentration, it can be returned to the leaching process as a pre-liquid.
CWL-M centrifugal extractor can be used in hydrometallurgy, fine chemicals, pharmaceuticals and other fields. If you need extraction equipment, welcome contact us.
Email: sales@tieiextraction.com
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