Khetha ulimi:
Nsimbi lesine isici ezivamile e ungqimba lomhlaba. Iron ibalulekile steel yokukhiqiza futhi ngenxa yalokho impahla kubalulekile ekuthuthukiseni umnotho womhlaba wonke. Iron nayo kabanzi ukwakhiwa kanye yokukhiqiza izimoto. Iningi nsimbi izinsiza yakhiwa metamorphosed banded zokwakheka yensimbi (BIF) lapho insimbi ngokuvamile atholakala ngendlela oxides, hydroxides futhi ngezinga elincane carbonates.
Ukwakheka kwamakhemikhali yensimbi imikhando ine ezahlukene sobala ububanzi e amakhemikhali ukwakheka ikakhulukazi Fe okuqukethwe futhi ezihambisana gangue amaminerali. Okukhulu yensimbi namaminerali elihlobene ne iningi imikhando nokusansimbi hematite, goethite, limonite futhi magnetite. I ezingcolisa lomcoka yensimbi imikhando kukhona SiO2 futhi Al2O3. I ejwayelekile Silica futhi alumina eziveza amaminerali atholakala yensimbi imikhando kukhona asebenza ngebhethri, kaolinite, gibbsite, diaspore futhi corundum. Of these it is often observed that quartz is the main silica bearing mineral and kaolinite and gibbsite are the two-main alumina bearing minerals.
Nsimbi isizinda ikakhulukazi latenta asebentisa emgodini ovulekile izimayini nokusebenza, okuholela abalulekile tailings isizukulwane. Uhlelo ukukhiqizwa nsimbi ngokuvamile uhlanganisa izigaba ezintathu: izimayini, ukuqhutshwa kanye pelletizing imisebenzi. kulezi, ukucutshungulwa kucinisekisa kutsi kunebudlelwane ezanele yensimbi grade kanye ne-chemistry kufinyelelwa ngaphambi esigabeni pelletizing. Icubungula kuhlanganisa kwasani, ngezigaba, ukugaya, and concentration aiming at increasing the iron content while reducing the amount of gangue minerals. idiphozi ngamunye amaminerali has izici zayo siqu esiyingqayizivele mayelana yensimbi kanye gangue nithela amaminerali, ngakho-ke kudinga ukugxilisa ingqondo indlela ehlukile.
Magnetic separation is typically used in high-grade iron ore beneficiation where the dominant iron minerals are ferro and paramagnetic. Wet futhi yomile ongaphakeme-amandla kazibuthe ngokuhlukana (LIMS) amasu asetshenziswa ukucubungula imikhando nge izakhiwo oqinile magnetic ezifana magnetite ngenkathi ezimanzi ephezulu umfutho ngokwahlukana kazibuthe isetshenziswa ukuhlukanisa namaminerali nithela Fe-nge ababuthakathaka izakhiwo kazibuthe ezifana hematite kusuka amaminerali gangue. Iron imikhando goethite okunjalo futhi limonite ngokuvamile atholakala e tailings futhi akusho ukuhlukanisa kahle ngokunye kwalokhu amasu.
Flotation isetshenziswa ukunciphisa okuqukethwe ukungcola ongaphakeme-ebangeni yensimbi imikhando. Iron imikhando kungenziwa bagxila noma nge ngqo flotation anionic yensimbi oxides noma ukubuyisela emuva flotation cationic of Silica, Nokho ukuhlanekezela flotation cationic uhlala ethandwa kakhulu flotation umzila obusetshenziswa embonini yensimbi. Ukusetshenziswa flotation yayo engavimba izindleko reagents, khona Silica futhi alumina-ocebile slimes futhi khona amaminerali carbonate. Ngaphezu kwalokho, flotation zidinga ukwelashwa imfucuza amanzi ukusetshenziswa Ukususwa esezansi ngoba ezomile izicelo lokugcina.
Ukusetshenziswa flotation ngoba lokuhlushwa yensimbi Kuhilela desliming njengoba sintanta khona inhlawulo imiphumela kahle kwehle futhi okusezingeni eliphezulu reagent izindleko. Desliming kuhlaba ezibucayi yokususa alumina njengoba ukwehlukana gibbsite kusukela hematite noma goethite yinoma yimuphi ejenti ebusweni-asebenzayo kunzima ngempela. Iningi alumina eziveza namaminerali kwenzeka ubukhulu zikanokusho ububanzi (<20um) allowing for its removal through desliming. Kukonke, a high concentration of fines (<20um) and alumina increases the required cationic collector dose and decreases selectivity dramatically. Therefore desliming increases flotation efficiency, but results in a large volume of tailings and in loss of iron to the tailings stream.
Dry processing of iron ore presents an opportunity to eliminate costs and wet tailings generation associated with flotation and wet magnetic separation circuits. STET has evaluated several iron ore tailings and run of mine ore samples at bench scale (pre-feasibility scale). Significant movement of iron and silicates was observed, with examples highlighted in the table below.
Imiphumela yalolu cwaningo wabonisa ukuthi ongaphakeme-ebangeni nsimbi izinhlawulo kungenziwa ngcono esebenzisa STET tribo-electrostatic ibhande isihlukanisi. Based on STET experience, nokuvulwa umkhiqizo kanye / noma ibanga ngeke kakhulu ngcono at umshayeli isikali ukucutshungulwa, njengoba kuqhathaniswa ebhentshini-ngezindodla idivayisi test ukusetshenziselwa phakathi kwalezi zilingo nsimbi.
The STET dry electrostatic fine iron ore separation process offers many advantages over traditional wet processing methods, such as magnetics or flotation, kuhlanganise:
Contact us to learn more about dry processing of iron ore.
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