Abstract: Black wet process phosphoric acid contains suspended and precipitated organic material and inorganic material. Upon standing, the precipitated material (mostly gypsum) forms a cake that is very difficult to be resuspended. By adding small amounts of nitric acid to the black acid, the nature of the precipitated material is changed and it does not cake and can be easily resuspended with slight agitation. Thus, the treated black acid can be shipped and stored and it can be clarified at the destination by adding water.

Abstract: This invention provides a process for clarifying black wet process phosphoric acid that comprises admixing said black phosphoric acid with phosphoric acid rinse water in a weight ratio of rinse water to black acid between about 0.5 and about 5, letting the resultant mixture stand thereby obtaining settled material and supernatant clarified black phosphoric acid, and, when said weight ratio is below about 1 to 1.5, depending on the quality of the black acid being clarified, separating said clarified black phosphoric acid from said settled material.

Abstract: A feature of this invention is the provision of a train of rounds carriers, adapted to come from a stationary supply, each carrier coupled to the next adjacent carrier by pivot means capable of unrestricted rotation, and each carrier carrying a respective round of ammunition; and a rounds orientation means, adapted to rotate in train as a function of the rotation in train of a gun and to intercept and orient each assembly of carrier and respective round, by rotation of its respective pivot means, to an orientation in train which is determined by the orientation in train of the gun.

Abstract: This invention provides a process for clarifying black wet process phosphoric acid that comprises admixing said black phosphoric acid with phosphoric acid rinse water in a weight ratio of rinse water to black acid between about 0.5 and about 5, letting the resultant mixture stand thereby obtaining settled material and supernatant clarified black phosphoric acid, and, when said weight ratio is below about 1 to 1.5, depending on the quality of the black acid being clarified, separating said clarified black phosphoric acid from said settled material.