Nauhasuodattimen toiminnan optimointi

Abstract

Tämän opinnäytetyön toimeksiantajana toimi Umicore Finland Oy ja sen tarkoituksena oli määrittää kokeellisesti nauhasuodattimen toiminnan kannalta keskeisien parametrien vaikutusta tuotetun sakan laatuun. Parametrien osalta päädyttiin perehtymään pääasiassa paineen ja kakun pesutavan vaikutuksia pesutulokseen.

Kokeellinen osa toteutettiin laboratoriomittakaavassa ja tehdasmittakaavan koeajolla. Analyysit ulkoistettiin Umicore Finland Oy:n laboratoriolle. Tuloksista muodostettiin regressiosuorat, joiden avulla tutkittiin kunkin parametrin vaikutusta sakan laatuun. Tutkimusten perusteella havaittiin nauhasuodatuksen optimoinnin ja pesusuhteen nostamisen selvä alentava vaikutus epäpuhtauksien pitoisuuteen.

The commissioner of this thesis was Umicore Finland Oy and the purpose was to experimentally determine the impact of key parameters in the operation of a horizontal vacuum belt filter on the quality of produced sludge.

The theory and background of the topic were investigated through the literature and studies of the field. Regarding the parameters, the focus was primarily on studying the effects of pressure and cake washing. The experimental part was conducted through a full-scale factory trial and laboratory experiments were also performed. Analyses were outsourced to the laboratory of Umicore Finland Oy.

Regression lines were formed from the experiment results, from previous laboratory analyses. These lines were used to examine the extent of each parameter's influence on the quality of the sludge. A connection was observed between the optimization of the horizontal belt filter and the increase in the washing ratio, which had a clear reducing effect on the concentration of impurities.