Matsayin Calcium Oxide a cikin Haɗin Zinare tare da Sodium Cyanide

Gabatarwa

Cyanidation na zinare, wanda aka fi sani da cyanide leaching, hanya ce da ake amfani da ita sosai wajen fitar da zinare daga ma'adinan da ba a sarrafa ba. A cikin wannan tsari, ana amfani da Sodium cyanide don narkar da zinare a cikin dutsen, domin zinare kanta ba ya narkewa a cikin cyanide. Duk da haka, kasancewar ƙazanta daban-daban da kuma yanayin sinadarai na ma'adinan na iya yin tasiri sosai ga inganci da farashin aikin cirewa. A nan ne Calcium oxide ke taka muhimmiyar rawa.

Daidaita ƙimar pH na ɓangaren litattafan almara

Ɗayan aikin farko na calcium oxide a cikin cyanidation na zinariya shine daidaita pH na ɓangaren litattafan almara. Lokacin da aka ƙara calcium oxide zuwa ruwa, yana amsawa don ƙara yawan adadin ions hydroxide a cikin maganin, don haka yana haɓaka darajar pH.

A cikin tsarin cyanidation, yana da mahimmanci a kiyaye matakin pH mai yawa, yawanci sama da 11. Wannan saboda Sodium Cyanide yana narkewa a cikin ruwan magani. Matsayin wannan hydrolysis yana da alaƙa da ƙimar pH na maganin. A babban pH, daidaiton amsawar hydrolysis yana canzawa don rage yawan hydrogen cyanide a cikin maganin. Tunda hydrogen cyanide yana canzawa kuma yana iya tserewa daga tsarin, kiyaye babban pH yana taimakawa hana asarar cyanide a cikin nau'in iskar hydrogen cyanide. Wannan yana da mahimmanci saboda babban abin da ke haifar da cirewar zinariya shine cyanide ion, kuma duk wani asarar cyanide zai haifar da ƙaruwar amfani da sodium cyanide da raguwar ingancin cire Gold.

Hana Hydrolysis na Cyanide

Kamar yadda aka ambata a sama, hydrolysis na sodium cyanide zai iya haifar da samuwar hydrogen cyanide, wanda ba wai kawai asara ce ta reagent mai mahimmanci na cyanide ba amma kuma yana haifar da haɗari na muhalli da aminci saboda yawan guba. Calcium oxide yana taimakawa hana wannan halayen hydrolysis. Ta hanyar haɓaka pH na maganin, yana rage yawan ions hydrogen da ke samuwa don amsawa tare da ions cyanide don samar da hydrogen cyanide. Wannan yana tabbatar da cewa mafi girma na cyanide ya kasance a cikin nau'in ions na cyanide, wanda ke da mahimmanci ga rushewar zinariya.

Kawar da illolin Wasu ions

Ore sau da yawa ya ƙunshi nau'ikan datti irin su jan karfe da ions baƙin ƙarfe, wanda zai iya yin mummunan tasiri akan tsarin cyanidation na zinariya. Misali, ions na jan karfe na iya amsawa da cyanide don samar da hadaddun mahadi, ta yadda za su cinye cyanide kuma su rage samunsa don narkar da gwal. Ƙarfe ions, musamman ferric ions, kuma na iya yin hulɗa tare da cyanide, samar da hadaddun ferricyanide.

Calcium oxide na iya taimakawa wajen rage waɗannan tasirin. A cikin yanayin alkaline wanda calcium oxide ya haifar, wasu daga cikin waɗannan ions na ƙarfe na iya haifar da hazo. Misali, ferric ions na iya amsawa tare da ions hydroxide don samar da ferric hydroxide hazo. Wannan hazo yana rage yawan ions baƙin ƙarfe a cikin maganin, yana hana su cinye cyanide kuma suna tsoma baki tare da aikin leaching na zinariya.

Matsalolin Mara Kyau a Babban pH

Duk da yake calcium oxide yana da amfani a yawancin nau'o'in tsarin cyanidation, idan darajar pH ya yi yawa (yawanci fiye da 12), zai iya haifar da mummunan tasiri akan hakar zinariya. A matsanancin matakan pH, calcium oxide na iya haifar da samuwar Layer na alli peroxide akan saman gwal. Wannan Layer yana aiki azaman shamaki, yana hana hulɗar kai tsaye tsakanin ions cyanide da saman zinariya, don haka yana hana rushewar zinariya. Sabili da haka, yana da mahimmanci don sarrafa adadin calcium oxide da aka ƙara a hankali don tabbatar da cewa an kiyaye pH a matakin da ya dace don haɓakar haɓakar zinare.

Kammalawa

A taƙaice, calcium oxide yana taka muhimmiyar rawa a cikin aikin hakar gwal ta amfani da sodium cyanide. Yana daidaita pH na ɓangaren litattafan almara, yana hana hydrolysis na cyanide, kuma yana taimakawa kawar da mummunan tasirin wasu ions na ƙarfe. Koyaya, kulawar da ta dace na pH yana da mahimmanci don guje wa mummunan tasiri akan hakar gwal. Fahimtar waɗannan ayyuka na calcium oxide na iya taimakawa wajen inganta tsarin aikin cyanidation, inganta ingantaccen hakar zinari, da rage yawan amfani da sodium cyanide, wanda ba kawai amfani da tattalin arziki ba amma har ma da muhalli ta hanyar rage yawan sakin mahadi na cyanide mai guba.