期刊
THEORETICAL FOUNDATIONS OF CHEMICAL ENGINEERING
卷 49, 期 2, 页码 138-144出版社
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0040579515020037
关键词
electroflotation extraction; slightly soluble compounds of nonferrous metals; efficiency; disperse phase; flocculant; aqueous solutions; electrokinetic potential
资金
- Ministry of Science and Education of the Russian Federation [2014/171]
The introduction of CO (3) (2-) , PO (4) (3-) and S2- ions as precipitants in solutions containing nonferrous ions led to a decrease of the average values of the hydrodynamic diameter of disperse phase particles d (av) by a factor of 1.5-2 relative to those in solutions containing the OH- precipitant. The electrokinetic zeta potential of the particles shifted toward higher negative values, -(25-55) mV, for metal phosphates and sulfides. The introduction of flocculants in the solutions led to enlargement of particles by a factor of 1.5-3 depending on the type of flocculant and the nature of the disperse phase. In the absence of flocculants, particles with sizes of 30-70 mu m and a charge of up to -15 mV were extracted most effectively. Particles with a high negative charge of the surface were not liable to effective coagulation; this negatively affected the electroflotation extraction. In this case, the use of a cationic type flocculant was most effective. In the presence of a flocculant of this type, the zeta potential shifted toward higher positive values, increasing the efficiency of electroflotation by a factor of 1.5-2; the degree of extraction of the disperse phase alpha reached 98%.
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