Njira yodumphira thovu nthawi zambiri imafotokozedwa ngati ntchito ya thupi ndi mankhwala, komwe tinthu ta mchere timakokedwa, ndikudziphatika pamwamba pa thovu, ndipo timasamutsidwira pamwamba pa selo, komwe timasefukira mu chotsukira madzi, nthawi zambiri mothandizidwa ndi mapadi, ndikuzungulira molunjika ku chotsukira madzi (chomwe nthawi zambiri chimakhala chimbudzi, chomwe cholinga chake ndi kunyamula thovu kupita ku thanki komwe limapopedwa kuti likonzedwenso, monga kuchotsa madzi kapena kutayira madzi. Kutulutsa thovu, pamakina odumphira madzi wamba, kumakhala kumapeto kwa selo kuchokera ku chakudya, kuonetsetsa kuti thovu limayenda kutalika konse kwa selo kudutsa mabanki angapo okhala ndi ma impeller-diffusers, lisanatulutsidwe ngati tailings.

Mitundu ingapo ya mankhwala imagwiritsidwa ntchito poyambitsa thovu, ndipo ina ingagwire ntchito. Choyamba ndi cholimbikitsira kapena chopopera thovu. Mankhwalawa amangopanga thovu lamphamvu zokwanira kuti lifike pamwamba popanda kusweka. Kukula kwa thovu ndikofunikira, komanso, ndipo chizolowezi chake ndi cha thovu laling'ono, chifukwa limapereka malo ambiri pamwamba (kukhudzana ndi zinthu zolimba zamchere mwachangu), komanso kukhala ndi kukhazikika kwakukulu. Kenako, zosonkhanitsa ndi mankhwala oyamba omwe amapanga mgwirizano pakati pa mchere winawake pamwamba pa thovu. Zosonkhanitsa zimayamwa pamwamba pa mchere kapena kupanga mankhwala ndi mcherewo, zomwe zimapangitsa kuti ukhale wolumikizidwa paulendo wopita ku chotsukira. Alcohols ndi ma asidi ofooka ndi mitundu iwiri ya mankhwala osonkhanitsa omwe amagwiritsidwa ntchito kwambiri popangira mchere.

Palinso zinthu zochepetsera kugwiritsidwa ntchito, monga zinthu zochepetsera, kuti zichepetse mankhwala kotero kuti zisamamatire ku thovu, mankhwala osintha pH, ndi zinthu zoyambitsa. Zinthu zoyambitsa zimathandiza kuti chosonkhanitsa chigwirizane ndi mchere winawake womwe ndi wovuta kuwuyandama.

Makampani monga Cytec, Nalco, ndi Chevron Phillips Chemical Company ndi omwe amapanga mitundu yonse ya mankhwala oyandama.

Mwabwino kwambiri, ma reagents adzawonjezedwa ku thanki yowongolera mpweya, yokhala ndi agitator, asanapite ku selo yoyandama, koma nthawi zambiri, amangowonjezedwa ku chakudya, asanalowe mu selo, kutengera momwe maselo amagwirira ntchito ndi ma impellers kuti asakanike.

Mcherewo uyenera kuphwanyidwa bwino kuti ukhale ngati tinthu tating'onoting'ono kuti utulutse mchere, nthawi zambiri ma mesh 100 kapena finer (150 microns). Kenako umasakanizidwa ndi madzi kukhala zinthu zolimba zokwanira (nthawi zambiri kuyambira 5% mpaka 20%), zomwe zingathandize kuti mcherewo ubwererenso bwino. Izi zimatsimikiziridwa m'maselo oyandama a labotale, ndikuyesa mayeso angapo kuti adziwe chilichonse chomwe chimayambitsa njirayi.

Mitundu ya makina oyandama imasiyananso kwambiri, koma onse ndi ofanana kwambiri, chifukwa amalowetsa mpweya pansi pa madzi, ndikuufalitsa mu selo. Ena amagwiritsa ntchito ma blowers, ma air compressor, kapena ntchito ya flotation impeller kupanga malo opanda kanthu pansi pake ndikukoka mpweya mu makinawo, kudzera mu standpipe yomwe imasunganso impeller shaft. Ndi mwatsatanetsatane wa njira yolowetsa mankhwala, mpweya ndi mchere m'madzi zomwe zimapangitsa kuti zikhale zosiyana.

Ndipo monga ndemanga, ndawonapo mawu ambiri abodza komanso abodza akuti makina opanga froth flotation agwira ntchito bwino kuposa china chilichonse kuyambira nthawi ya mafuta a njoka ku Old West. Nthawi zambiri ndi bwino kugwiritsa ntchito mtundu wabwino womwe umagwiritsidwa ntchito kwambiri pofalitsa mchere womwe mukufuna.

Kupita patsogolo kwakukulu kwakhala kugwiritsa ntchito Column Flotation ngati selo loyera loyandama mumakampani opanga mkuwa (ndi mafakitale ena angapo). Imapanga chinthu choyera, ndipo imagwira ntchito bwino ngati selo loyera, nthawi zambiri, kuposa maselo oyandama wamba. Maselo oyandama m'mizere anayamba kuonekera m'zomera kumapeto kwa zaka za m'ma 1970 mpaka m'ma 1980 ndipo anavomerezedwa kwambiri m'zaka za m'ma 1990. Njira yaikulu yogwiritsira ntchito maselo oyandama wamba yakhala Yaikulu ndi Yabwino, ndipo mayunitsi akuluakulu akubwera pamsika m'zaka makumi angapo zapitazi.