"The mineral compositions were computed by iterations to fit typical mineral
composition of the feed and the chemical compositions to less than 0.1%
differences. The corresponding computed mineral compositions are also given in
Table 4. Pentlandite was considered with Ni/Fe = 1.
From these compositions, the acid use/production of every mineral during
leaching of both the FSF-fine matte and EF matte were calculated theoretically.
For both mattes, it was considered that all copper is turning into Antlerite
(considering that there is no sulphide in the copper cake)."

вопрос:

как здесь перевести "were computed by iterations "?

Спасибо!

Если аскер получает по русскому тексту, имеет смысл назвать это методом последовательных приближений! ;)