BUSSURMANOVA A.
Yessenov University
Aktau city, Kazakhstan
e-mail: akkenzhe.bussurmanova@yu.edu.kz
Abstract. The problem of extracting heavy and non-ferrous metals from spent solutions of galvanic production is of great importance from the point of view of capturing metals valuable for the national economy and neutralizing industrial wastewater.
Existing methods of extracting lead from spent solutions and wastewater mainly involve the addition of reagents. These methods have some disadvantages: economic unprofitability; does not meet modern environmental requirements; additional pollution with ions and the formation of poorly soluble compounds and the labor intensity of extracting metals from them.
Close to the method proposed by us in technical essence is the use of volume-porous flow electrodes (VPFE) made of carbon fibrous materials. The disadvantage of this method is the high cost of electrodes associated with the use of carbon fibrous materials.
The most advantageous seems to be the electrochemical method proposed by us using lump electrodes with a developed surface. The proposed work presents the results of electrolysis of solutions with an initial lead concentration of 200 mg/l on lump graphite electrodes. The experiments were conducted in a flow mode on bulk lump graphite electrodes in an electrolytic cell. An experimental setup was used to purify waste solutions from lead ions using an electrochemical method with the use of piece electrodes with a developed surface. The electrolyzer setup consists of two glass vessels and an electrolyzer with lump electrodes, which are the cathode, and the graphite rod serves as the anode. The thickness of the lump electrode layer was changed depending on the experimental conditions within 0.5-3 cm.
Key words: extraction; electrolyze; lead (II) ions; graphite electrodes.