E ai ki te pūrongo a te Whare Wānanga Hangarau o Chalmers i Huitene, he tikanga hou tēnei mō te hangarua i ngā pākahiko waka hiko. Kāore e hiahiatia he matū utu nui, he matū kino rānei mō tēnei tukanga nā te mea i whakamahia e ngā kairangahau te waikawa oxalic, he waikawa waro e kitea ana i roto i te ao tipu.
E ai ki te whare wānanga, ka taea e te tukanga te whakaora i te 100% o te konumohe me te 98% o te lithium mai i ngā pākahiko waka hiko. Mā tēnei ka whakaitihia hoki te ngaronga o ngā rauemi mata nui pēnei i te nikara, te konupora me te konupora.
I te Whare Wānanga o Chalmers, i ngana tētahi tīma ki te tukatuka i te mea pango, he ranunga paura o ngā rauemi hohe nui i roto i ngā pākahiko, ki roto i te waikawa oxalic. Ina koa, i kōrero mātou mō te pākahiko waka hiko Volvo. E whakaahua ana te tuhipoka i te tukanga hei "hanga kawhe." Inaa, he tino uaua ake ngā mea katoa, nā te mea kia puta ai te hua e hiahiatia ana i te tukanga waikawa oxalic, me tīpako tika te pāmahana, te kukū me te roa. Heoi anō, kei roto i ngā tipu pēnei i te rhubarb me te spinach te waikawa oxalic.
"Tae noa ki tēnei wā, kāore anō kia kitea e tetahi ngā tikanga e tika ana mō te wehewehe i tētahi nui o te lithium mā te whakamahi i te waikawa oxalic me te tango i te konumohe katoa. Nā te mea kei roto i ngā pākahiko katoa te konumohe, me taea e tātou te tango atu me te kore e ngaro ētahi atu konganuku," te kī a Leah Rouquette, he tauira paerua i te tari matū o te whare wānanga.
I roto i ngā tukanga hydrometallurgical e whakamahia ana i tēnei wā, ka rewa ngā matū ferrous ki roto i ngā waikawa inorganic. Kātahi ka tangohia ngā "paru" pēnei i te konumohe me te parahi, ā, ka whakahokia mai ngā rauemi hohe pēnei i te cobalt, te nickel, te manganese me te lithium.
Heoi, e kī ana ngā kairangahau Huitene ahakoa he iti noa te konumohe me te parahi e toe ana, me maha ngā mahi purenga, ā, i ia mahi ka ngaro pea te konutai. Mā te whakamahi i te tikanga hou, i hurihia e ngā kairangahau te raupapa, ā, i whakaitihia te konutai me te konutai i te tuatahi. Mā tēnei ka taea e rātou te whakaiti i te moumou o ngā konganuku utu nui e hiahiatia ana hei hanga pākahiko hou.
Ka taea hoki te whakarite i te taahiraa e whai ake nei ki te hanga kawhe: ahakoa kei roto i te wai te konumohe me te lithium, ka noho tonu ngā konganuku e toe ana ki te "totoka". Ko te taahiraa e whai ake nei i roto i tēnei tukanga ko te wehewehe i te konumohe me te lithium. "Nā te mea he tino rerekē ngā āhuatanga o ēnei konganuku, kāore mātou e whakaaro he uaua ki te wehewehe i a rāua. He huarahi hou whai hua tā mātou tikanga ki te hangarua i ngā pākahiko, he mea tika kia tūhuratia anō," te kī a Rouquette.
"Me whakamahi tātou i ētahi atu huarahi hei whakakapi i ngā matū kore-ora. Ko tētahi o ngā arai nui rawa atu o ngā tukanga o ēnei rā ko te tango i ngā rauemi toenga pērā i te konumohe. He huarahi auaha tēnei ka taea te whakarato i ngā huarahi hou ki te umanga whakahaere para, ā, ka āwhina i te whakaoti rapanga e aukati ana i te tipu," te kī a te ahorangi tari. Heoi, i tāpiri atu ia me rangahau anō te tikanga: "I te mea ka taea te whakanui ake i tēnei tikanga, ko te tumanako ka taea te whakamahi i roto i te umanga i ngā tau e haere ake nei."
Mai i te tau 2011, kua kapi mātou i te whanaketanga o ngā waka hiko me te ngākau nui me te tohungatanga ki te mahi kairīpoata. Hei te hunga pāpāho matua o te umanga, ka whakaratohia e mātou te kounga teitei, te kapi whānui o ngā kaupapa, hei tūāpapa matua mō te whanaketanga tere o tēnei hangarau. Kei roto ko ngā purongo, ngā mōhiohio papamuri, ngā pūrongo taraiwa, ngā uiui, ngā ataata me ngā mōhiohio whakatairanga.