PROCESS FOR PRODUCING VITROCRYSTALLINE PYROXENE MATERIALS RESISTING TO WEAR AND CHEMICAL AGENTS

The invention relates to a process for producing crystallized products resisting to wear and chemical agents, employed for cladding tanks in the chemical, mining and food industries, said products having an oxide composition comprising 42...55% SiO2, 9...18% Al 2 O3, 0.2...0.4% TiO2, 5.5. ...8.64% F...

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Hauptverfasser: DUCA MIHAI VOICU, DUCA MIHAELA MARIA
Format: Patent
Sprache:eng ; rum
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Zusammenfassung:The invention relates to a process for producing crystallized products resisting to wear and chemical agents, employed for cladding tanks in the chemical, mining and food industries, said products having an oxide composition comprising 42...55% SiO2, 9...18% Al 2 O3, 0.2...0.4% TiO2, 5.5. ...8.64% Fe2 O3; 13.4...24.10% CaO; 6.54...8.64% MgO ; 1.1...1.5% alkaline oxides. The process consists in melting a mixture comprising ash and slag resulting from steam power plants, dolomite, marble and sand at a temperature of 1450 ° C.The glass melt is pressed in adequate metal dies, the product is annealed at the temperature of 700°C then crystallized in two steps, a first step at the temperature of 750°C for an hour and the second step at the temperature of 1100°C for two hours, followed by cooling at a rate of 40°C/ for 20 hours.. Invenţia se referă la un procedeu de obţinere a unor produse cristalizate, rezistente la uzură şi agenţi chimici, utilizate la placarea bazinelor în industria chimică, minieră şi alimentară, având o compoziţie oxidică, alcătuită din 42...55% SiO, 9...18% AlO, 0,2...0,4 TiO, 5,5...8,64% FeO; 13,4...24,10% CaO; 6,54...8,64% MgO; 1,1...1,5% oxizi alcalini. Procedeul constă în topirea la temperatura de 1450°C a unui amestec constituit din cenuşă sau zgură de termocentrală, dolomit, marmură şi nisip. Se presează topitura de sticlă în matriţe metalice adecvate, se recoace produsul la temperatura de 700°C, apoi se cristalizează în două etape, prima la temperatura de 750°C, timp de 1 h, şi a doua, la temperatura de 1100°C, timp de 2 h, ulterior răcindu-se cu o viteză de 40°C/h, timp de20 h.