diplomsko delo
Jerneja Bezgovšek (Author), Aleksandra Lobnik (Mentor), Mojca Poberžnik (Co-mentor)

Abstract

Kalcijev karbonat je kemična spojina, ki ima zaradi svojih lastnosti edinstven pomen in vlogo v mnogih vejah industrije, bodisi kot polnilo ali pigment. Uporablja se predvsem v proizvodnji papirja, plastike, gume ter v farmacevtski in živilski industriji. V naravi se nahaja v različnih oblikah - kot apnenec, kreda ali marmor. Glede na izvor je lahko rahlo rumenkasto obarvan, kar kazi belino čistega CaCO3. Pogoj za dobro kakovost karbonatnih polnil je poleg odlične beline tudi, da je njihova suspenzija stabilna in mikrobiološko neoporečna. Zato v postopku predelave karbonatna polnila zaščitijo proti razpadu suspenzije in mikrobiološki nestabilnosti s kemijskimi dodatki kot so biocidna sredstva, različni konzervansi, vodikov peroksid in dispergirna sredstva. Uvedba postopka ozoniranja v tehnološki proces priprave suspenzije CaCO3 je priložnost izboljšati belino suspenzije CaCO3 in hkrati zagotoviti mikrobiološko stabilnost izdelka ter na ta način zmanjšati porabo biocidnih sredstev in belil.

Keywords

kalcijeva karbonatna polnila;CaCO3;ozoniranje;pH vrednost;električna prevodnost;belina;mikrobiologija;presejalni test;

Data

Language: Slovenian
Year of publishing:
Source: Maribor
Typology: 2.11 - Undergraduate Thesis
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: [J. Bezgovšek]
UDC: 628.166.094.3-926.214(043.2)
COBISS: 16303126 Link will open in a new window
Views: 2786
Downloads: 175
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Other data

Secondary language: English
Secondary title: ǂThe ǂinfluence of the ozonation on the whitness and microbiological stability of the CaCO3 suspension
Secondary abstract: Calcium carbonate as chemical compound with specific properties is highly significant and plays a unique role in various branches of industry. It could be applied as filler or a pigment. It is used mainly in paper, plastic, rubber, pharmaceutical and food industry. Its most common natural forms are limestone, chalk or marble. Depending on its origin it can be yellowish, which negatively influences the whiteness of pure CaCO3. Carbonate fillers of good quality should in addition to excellent whiteness be stable and microbiologically impeccable in suspension. To achieve the high quality of product, carbonate filler suspensions are protected against destabilization and microbiological infection with biocides, various preservatives, hydrogen peroxide and dispersants in the production phase. Introduction of the ozonation process into technological process of producing the suspension CaCO3 is a promissing opportunity to improve CaCO3 suspension's whiteness and at the same time ensure microbiological stability of the product and reduce use of biocides and whitening agents.
Secondary keywords: calcium carbonate filler;ozonation;pH value;electrical conductivity;whiteness;microbiology;screening test;
URN: URN:SI:UM:
Type (COBISS): Bachelor thesis/paper
Thesis comment: Univ. v Mariboru, Fak. za strojništvo, Tekstil
Pages: XVI, 85 f.
Keywords (UDC): applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;engineering;technology in general;inženirstvo;tehnologija na splošno;public health engineering;water;sanitation;illuminating engineering;sanitarna tehnika;zdravstvena tehnika;voda;sanitarne naprave;svetlobna tehnika;water supply;water treatment;water consumption;oskrba z vodo;priprava vode;uporaba vode;
ID: 8716970