Assertion: nitric acid | /r/HasProperty | consumed
Facets:
Source sentences:
text: Thus, in order to insure the formation of the jarosite or the similar iron compound, it is essential that enough of the nitric acid be consumed by the ore material to cause the pH of the pregnant leach solution to rise from a pH of less than 0.5 during the course of the leaching operation through pH 0.5, as the nitric acid is consumed, to a pH short of that which would cause hydrolysis of the metal value or values to be recovered.
text: A nitric acid process for recovering metal values from sulfide ore materials containing sulfide iron and values of one or more of the group of metals consisting of copper, nickel, cobalt, and silver, comprising subjecting such an orc material to the leaching action of an aqueous solution of nitric acid, the relative quantities of said ore material and of nitric acid in said solution being such that the pH of the pregnant leach solution rises from a pH of less than 0.5 during the course of the leaching operation, through pH 0.5 as the nitric acid is consumed, to a pH short of hydrolysis of the metal value or values to be recovered, and there being sufiicient sulfate in the leach solution to supply the stoichiometric requirements for the formation of a jarosite or of an iron compound having the formula