Isendlalelo se-oxide esingaphezulu kwepuleti elinamatshe ensimbi engagqwali eligoqwe elishisayo ngokuvamile liwugqinsi. Uma kususwa kuphela ukuqoqwa kwamakhemikhali, ngeke nje kwandise isikhathi sokuqoqa futhi kunciphise ukusebenza kahle kwe-pickling, kodwa futhi kwandise izindleko zokuqoqa kakhulu. Ngakho-ke, ezinye izindlela zidinga ukusetshenziswa njengezindlela ezisizayo zokwelashwa kwangaphambili kwepuleti lensimbi. Kunezindlela ezintathu eziyinhloko zokwelapha zangaphambi kokwelashwa zokukhetha:

1. Ukuqhuma kwesibhamu

I-shot peening iyindlela esetshenziswa kakhulu ye-mechanical dephosphorization njengamanje. Isimiso siwukusebenzisa okokusebenza kokuvula isibhamu ukufafaza isibhamu esihle se-granular steel (isihlabathi) ukuze sibe nomthelela epuletini elinamekwe lensimbi engenasici ukuze kukhishwe isendlalelo se-oxide endaweni yensimbi. Ngemuva kokwelashwa kwe-shot peening, ingxenye yongqimba lwe-oxide iyasuswa, futhi ukwakheka kwesendlalelo se-oxide esele endaweni yebhodi kuba ngezikhathi ezithile futhi kuxege, okuzuzisa inqubo yokukhetha okulandelayo.

2. Ukwelashwa kwe-alkali leaching

Ukwelashwa kwe-alkali leaching kuyi-oxidative alkaline leaching futhi kunciphisa ukucwiliswa kwe-alkaline. I-alkali leaching yohlobo lwe-oxidation ibizwa nangokuthi "indlela yokugeza usawoti". I-Alkaline CrO3, futhi ngenxa yokushintsha kwesakhiwo kanye nevolumu yongqimba lwe-oxide, ungqimba lwe-oxide luzowa. Ukuncishiswa kwe-alkaline ukushintsha ama-oxide ensimbi angancibiliki njengensimbi, i-nickel, i-chromium namanye ama-oxide ensimbi angancibiliki ongqimbeni lwe-oxide abuyele ezinsimbi nama-oxide anenani eliphansi ngokusebenzisa i-ejenti yokunciphisa eqinile engu-NaH, futhi wenze ungqimba lwe-oxide luphuke futhi liwe, ngaleyo ndlela kufinyezwe isikhathi sokukhetha, kuthuthukise ukusebenza kahle kwawo wonke.

Kuyaqapheleka ukuthi amapuleti anensimbi engagqwali azodala izinga elithile lokunukubezeka kwe-Cr6+ phakathi nenqubo yokwelapha yokucwiliswa kwe-alkali ene-oxidative. Ukunciphisa ukwelashwa kwe-alkaline leaching kungaqeda inkinga yokungcoliswa kwe-Cr6+, kodwa impahla yayo eluhlaza eyinhloko, i-NaH, ayikwazi ukukhiqizwa e-China. Njengamanje, indlela esetshenziswa kakhulu eShayina i-potassium permanganate oxidation uhlobo lokwelashwa kwe-alkali leaching, kuyilapho ukwelashwa kohlobo lokunciphisa i-alkali leaching kuvame ukusetshenziswa kwamanye amazwe.

3. I-electrolysis kasawoti engathathi hlangothi

Inqubo ye-electrolysis kasawoti engathathi hlangothi isebenzisa isisombululo samanzi se-Na2SiO4 njenge-electrolyte. Ipuleti lensimbi engagqwali elinefilimu lingadlula endaweni kagesi phakathi kwe-cathode ne-anode, lishintshe ngokuqhubekayo i-cathode ne-anode, futhi lisuse ungqimba lwe-oxide engaphezulu ngokusebenzisa isenzo samanje. Indlela yenqubo ye-electrolysis kasawoti engathathi hlangothi isekelwe eqinisweni lokuthi ama-oxide okunzima ukuncibilika e-chromium, manganese, nensimbi kungqimba lwe-oxide afakwa kuma-ion anenani eliphezulu ancibilikayo, ngaleyo ndlela ancibilikise ungqimba lwe-oxide; Insimbi ebhethrini ifakwa i-ion, ukuze ungqimba lwe-oxide olunanyathiselwe phezulu luyaxebuka.