Ifomula yokubala izithako ze imathiriyeli yokurhangqa isithando somlilo:

1. Ubuninzi bokudibanisa = ukulayisha ubuninzi-imali epheleleyo ye-ferroalloy-iron igalelo lobungakanani bentsimbi eseleyo ibuyele kwisithando somlilo;

2. Imali yokulayisha = ukucofa inani / ireyithi yokubuyisela intsimbi ebanzi;

3. Isixa sentsimbi ekrwada = isixa esongeziweyo sentsimbi × isiqulatho sentsimbi × umlinganiselo wengeniso yentsimbi. Imali yokongeza i-ore ibalwa ngokubanzi kwi-4% yomthamo wokucofa, umxholo wesinyithi we-ore yi-55%, kunye nesantya sokubuyisela isinyithi Ngokwe-80% yokubuyisela, inani elipheleleyo lokubuyisela intlawulo liguquguquka phakathi kwe-92 ~ 96%; kwaye ibalwa ngokubanzi kuma-94%.