Abstract
Sodium oleate and calcium chloride are used as de-inking chemicals in the flotation of ink particles in a slurry of recycled papers. Together they form calcium oleate particles which increase the efficiency of ink removal. To simulate this process we studied how latex particles, with carboxylated charge groups on their surface to model ink surfaces, deposit on an air/water interface in the presence of calcium oleate. The deposition was observed with the impinging jet technique. At the same time, homo- and heteroflocculation studies of latex and calcium oleate were performed. It was found that deposition occurs when latex particles are heteroflocculated with calcium oleate particles, which occurs near the critical coagulation concentration for homocoagulation of calcium oleate. Direct observations of the deposition process indicate that calcium oleate particles act as a bridge between latex particles and the air/water interface. When calcium chloride is added to a latex-dispersion containing oleate, the formation of calcium oleate particles results in a reduction of oleate adsorbed on the latex particles, thus reducing their surface charge.
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