Welcome to ERA-NET / CELMIN PROJECT site of
Faculty of Engineering - North University Centre of Baia Mare
Department of Mineral Resources Engineering, Materials and Environment - DMREME
Green Mining Research Group
ERA-NET / CELMIN PROJECT
This work was supported by a grant of the Romanian National Authority for Scientific Research, CCCDI-UEFISCDI, project number 3-007/2014
UTILISATION OF GREEN CHEMICALS IN NON-ENERGY EXTRACTIVE INDUSTRIES:
Preparation of modified nanofibrillar celluloses (NFC) for flotation, flocculation and dewatering, and water purification in mining industry (CELMIN)
* Summary of CELMIN
Mining industry is a water intensive industry that causes large volumes of dilute waste waters containing various substances. Open pits, tailings ponds, ore and subore stockpiles, waste rock dumps, and heap/dump leach piles are potentially significant sources of toxic pollutants of surface waters and buildup of possible toxic sediments due to seepage, rain fall and snow melt. Although the majority of dissolved solid substances in waters originates from ore, a small amount of pollutants comes from oil-based chemicals used in flotation as well as other metal concentration processes and dewatering, possibly creating toxicity problems when released in effluents. Thus, the purification of waters coming from both extraction and mineral processing during mining activities is needed. Mine-closure and rehabilitation issues have to take into account because acid drainages are also generated at abandoned mine sites.
The CELMIN project aims to develop concepts for environmental-friendly effective green chemicals by the chemical modification of nanofibrillar celluloses (NFCs) to be functional in mining applications responsible for dissolved and suspended solids load. Four different uses are studied;
* Use of hydrophobized NFCs as a collector in ore and mineral flotation,
* Use of anionized, cationized and hydrophobized NFCs as a dewatering agent in concentrate and tailings
* Use of anionized and cationized NFCs as a flocculant in suspended solids removal from mining, process and seepage waters,
* Use of anionized NFCs as adsorbent in removal of heavy metals and ammonium from waters
The results of the project is expected to increase sustainability of primary non-energy resource supply by decreasing water pollution of mining industry, lower carbon footprint by using renewable raw materials instead of a fossil feedstock in chemical production and lessen the concern about environmental issues by using biodegradable chemicals in dressing of ores and water purification.