Taloženje silicijum-dioksida u hidrometalurškim procesima

  • Srećko R. Stopić Tehnički univerzitet u Ahenu
  • Bernd G. Friedrich RWTH Aachen University, IME Process Metallurgy and Metal Recycling, Aachen
Ključne reči: silicon||, ||silicijum, hydrometallurgy||, ||hidrometalurgija, gel||, ||gel, silica||, ||silicijum-dioksid,

Sažetak


Uvod/svrha: Rastvaranje obojenih metala iz oksidnih ruda, kao što su lateriti, boksiti sa visokim sadržajem silicijuma i eudialit, korišćenjem kiselina povezano je sa stvaranjem gela od silicijum-dioksida.

Metode: Sličnost sa ponašanjem silicijum-dioksida u hidrometalurškim procesima, kao što su rastvaranje pri atmosferskom i visokom pritisku, taloženje, neutralizacija i filtriranje, od velikog je značaja za izvlačenje metala iz rastvora.

Rezultati: Izbegavanje formiranja gela omogućeno je korišćenjem rastvaranja velikim koncentracijama kiselina („suvo rastvaranje”) i apsorpcijom ugljen-dioksida od olivina pri visokom pritisku u autoklavu.

Zaključak: Priprema finog praha silicijum-dioksida iz olivina u vodenom rastvoru postignuto je na 175°C i 120 bara za 4 sata u autoklavu korišćenjem dodataka kao što su natrijum-bikarbonat i oksalna kiselina.

Biografija autora

Srećko R. Stopić, Tehnički univerzitet u Ahenu

Dr.-Ing. tehnickih nauka

Metalurgija, naucni saradnik

Reference

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Objavljeno
2019/12/06
Rubrika
Pregledni radovi