Abstract
Laboratory testing, carried out in this paper, are focused on a stability determination of smelting slag suspension by investigation one of the influence factors - concentration of dispersing agents on its stability. Testing the suspension stability of smelter slag was carried out in this work by two ways: 1. Determining the suspension stability by sedimentation rate through the height of deposit formation on the bottom of measuring beaker at the certain time intervals; 2. Determining the suspension stability by determination the electrokinetic or zeta potential of smelter slag measuring the electrophoretic mobility on the Riddick zetameter with electrophoretic cell. Inorganic and organic dispersing agents of sodium silicate (water glass) and sodium polyacrylate were used in the experiments. Analyzing the experimental results has determined that the usage of those dispersants in the adequate concentrations increases the stability of formed suspension of smelter slag. Sodium polyacrylate, present in concentration of 50 g/t and sodium silicate in concentration of 5 g/t have positive effect on the increase of suspension stability, what is confirmed by the kune equations. Sodium polyacrylate and sodium silicate in concentration of 100 g/t sodium polyacrylate and sodium silicate decrease the stability of formed suspension of smelter slag. Higher values of zeta potential (-21÷ -29 mV) were measured during work with sodium polyacrylate of 50 mg/l concentration in the interval of pH range from 3 to 11. During work with sodium silicate in concentration of 5mg/l, the measured values of zeta potential were lower (-17 ÷ - 28 mV), while in the experiments without addition of any dispersing agent, the interval of measured values was -13 ÷ -18 mV. Those results show a positive effect of dispersing to the increase of smelter slag stability for the mentioned conditions. Concentrations of 100 mg/l of dispersing agents caused a potential decrease and thereby a decrease of stability. Sodium polyacrylate has been showed as better dispersing agent than sodium silicate.
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