process for the manufacture of wolframique acid and sprocede obtained is wolframique acid and ferrous sulfate heptahydre. rapid ulphate ferrous steel steel machfer heptahydrate ardark

摘要

the process to achieve wolframic ferrous sulfate heptahydrate and acid from steel fast thunder, by treating tunderului grinding all the dimensions under a 1 mm, with mineral acidscharacterized in that