Te maimoatanga o te wai para kei roto te chromium i roto i te whakakikorua hiko
Te whakataurite i ngā pānga maimoatanga o te ferrous sulfate me te sodium bisulfite
Me whakapūmau te tukanga whakaputa hiko, ā, i roto i te tukanga purenga whakapūmau, ko te tikanga ka whakamahia e te tipu hiko te chromate, nō reira ka puta he nui o te wai para hiko kei roto te chromium nā te whakakikoruatanga chromium. Kei roto i te chromium i roto i te wai para kei roto te chromium he chromium hexavalent, he paitini, he uaua ki te tango. Ko te chromium hexavalent ka hurihia ki te chromium trivalent ka tangohia. Hei tango i te wai para hiko kei roto te chromium, he maha ngā wā ka whakamahia te matū whakapūmau me te whakapūmau hei tango. Ko ngā mea e whakamahia whānuitia ana ko te tikanga whakapūmau ferrous sulfate me te raima me te tikanga whakapūmau sodium bisulfite me te alkali.
1. te tikanga whakahekenga o te whanariki ferrous me te raima
He matū whakapūpū waikawa kaha te konupūmā ferrous, ā, he kaha ōna āhuatanga whakaiti-waikura. Ka taea te whakaiti tika i te konupūmā ferrous ki te chromium hexavalent i muri i te waikura i roto i te wai para, ka hurihia hei wāhanga o te whakapūpū me te whakapūpū chromium trivalent, kātahi ka tāpirihia he raima hei whakatika i te uara pH ki te 8~9, kia taea ai te āwhina i te tauhohenga whakapūpū ki te whakaputa i te whakapūpū chromium hydroxide, ka taea e te pānga tango o te chromate te eke ki te 94%.
He pai te pānga o te whakarewa whanariki ferrous me te raima whakakōkī i te chromate precipitation ki te tango i te chromium, ā, he iti hoki te utu. Tuarua, kāore he take ki te whakarerekē i te pH i mua i te tāpiri i te ferrous sulfate, engari me tāpiri noa te raima hei whakarerekē i te pH. Heoi, nā te nui o te horopeta o te ferrous sulfate i hua ake ai te pikinga nui o te paru rino, me te pikinga ake o te utu o te maimoatanga paru.
2, te tikanga whakahekenga matū konutai bisulfite me te kawakore
Mā te konutai bisulfite me te konutai whakaheke-waikawa, ka whakatikatikaina te pH o te wai para ki te ≤2.0. Kātahi ka tāpirihia te konutai bisulfite hei whakaiti i te konutai ki te konutai trivalent, ā, ka uru te wai para ki te puna whānui i muri i te otinga o te whakahekenga, ka papuhia te wai para ki te puna whakahaere hei whakatikatika, ā, ka whakatikatikaina te uara pH ki te 10 pea mā te tāpiri i ngā pūnga kawakore, kātahi ka tukuna te wai para ki te tāke whakatō hei whakaputa i te konutai, ā, ka taea e te tere tango te eke ki te 95%.
He pai te tikanga o te konutai bisulfite me te alkali reduction precipitation chromate mō te tango i te chromium, ā, he nui ake te utu i te ferrous sulfate, ā, he roa ake te wā urupare maimoatanga, ā, me whakatikatika te uara pH ki te waikawa i mua i te maimoatanga. Heoi, ki te whakaritea ki te maimoatanga ferrous sulfate, kāore e nui rawa te paru e puta mai ana, ka tino whakaiti i te utu o te maimoatanga paru, ā, ko te paru kua rongoatia ka taea te whakamahi anō.