---
kind: "section"
citation: "40 C.F.R. § 61.121"
title: "40"
number: "61.121"
heading: "Definitions."
url: "https://uscodex.org/cfr/40/61.121"
---

# §61.121. Definitions.

- (a) **Elemental phosphorus plant—** or plant means any facility that processes phosphate rock to produce elemental phosphorus. A plant includes all buildings, structures, operations, calciners and nodulizing kilns on one contiguous site.
- (b) **Calciner—** or Nodulizing kiln means a unit in which phosphate rock is heated to high temperatures to remove organic material and/or to convert it to a nodular form. For the purpose of this subpart, calciners and nodulizing kilns are considered to be similar units.

## Notes

### Source

Source: 54 FR 51699, Dec. 15, 1989, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 38 FR 8826, Apr. 6, 1973, unless otherwise noted.