tricalcic

When sulphuric acid is added to tricalcic phosphate, the following reaction takes place: --

Manures and the principles of manuring Charles Morton Aikman

In the commonest form, popularly called bone-phosphate, which is the form in which lime and phosphoric acid are combined in bones, guano, and the ordinary mineral phosphates, the lime and phosphoric acid are combined in the form of what is known as tribasic phosphate of lime, or tricalcic phosphate -- that is to say, for every equivalent of phosphoric acid there are three equivalents of lime.

Manures and the principles of manuring Charles Morton Aikman

The amount of phosphates present in a manure is usually stated in its analysis as so much phosphoric acid, while in a footnote the quantity of tricalcic (or ordinary bone) phosphate this amount is equivalent to is also given, this being the unit of valuation.

Manures and the principles of manuring Charles Morton Aikman

(Equal to tricalcic phosphate rendered "soluble" 17.58)

Manures and the principles of manuring Charles Morton Aikman

Thus, for example, in an analysis of a superphosphate of lime, the statement, _monocalcic phosphate, 17.3 per cent, equal to tricalcic phosphate rendered "soluble," 27.2 per cent_, means that it would require 27.2 per cent of tricalcic phosphate to furnish 17.3 per cent of soluble phosphate.

Manures and the principles of manuring Charles Morton Aikman

(Equal to tricalcic phosphate rendered "soluble" 21.42)

Manures and the principles of manuring Charles Morton Aikman

As we have already pointed out in the chapter on Basic Slag, phosphoric acid occurs in the slag in the form of tetrabasic phosphate of lime, although it is invariably stated in analysis as so much tricalcic phosphate.

Manures and the principles of manuring Charles Morton Aikman

-- on tricalcic phosphate, 398; in ash of plants, 54; as a fixer, 245, 285; necessary for plant-growth, 55; superphosphate manufactured with, 384, 388.

Manures and the principles of manuring Charles Morton Aikman

a soluble condition they are stated as such, and at the same time a statement is made as to the quantity of tricalcic phosphate which would be required to furnish this amount by treatment with sulphuric acid.

Manures and the principles of manuring Charles Morton Aikman