Sulphuric acid is mixed with ground phosphate rock (to produce
phosphoric acid) in a steel digestor lined with
(A) Acidic refractory
(B) Rubber
(C) Karbate
(D) Lead or acid proof bricks
phosphoric acid) in a steel digestor lined with
(A) Acidic refractory
(B) Rubber
(C) Karbate
(D) Lead or acid proof bricks