40 CFR § 60.181 - Definitions.
---
identifier: "/us/cfr/t40/s60.181"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 60.181 - Definitions."
title_number: 40
title_name: "Protection of Environment"
section_number: "60.181"
section_name: "Definitions."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "60"
part_name: "STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
regulatory_source: "36 FR 24877, Dec. 23, 1971, unless otherwise noted."
cfr_part: "60"
---
# 60.181 Definitions.
As used in this subpart, all terms not defined herein shall have the meaning given them in the Act and in subpart A of this part.
(a) *Primary lead smelter* means any installation or any intermediate process engaged in the production of lead from lead sulfide ore concentrates through the use of pyrometallurgical techniques.
(b) *Sintering machine* means any furnace in which a lead sulfide ore concentrate charge is heated in the presence of air to eliminate sulfur contained in the charge and to agglomerate the charge into a hard porous mass called *sinter.*
(c) *Sinter bed* means the lead sulfide ore concentrate charge within a sintering machine.
(d) *Sintering machine discharge end* means any apparatus which receives sinter as it is discharged from the conveying grate of a sintering machine.
(e) *Blast furnace* means any reduction furnace to which sinter is charged and which forms separate layers of molten slag and lead bullion.
(f) *Dross reverberatory furnace* means any furnace used for the removal or refining of impurities from lead bullion.
(g) *Electric smelting furnace* means any furnace in which the heat necessary for smelting of the lead sulfide ore concentrate charge is generated by passing an electric current through a portion of the molten mass in the furnace.
(h) *Converter* means any vessel to which lead concentrate or bullion is charged and refined.
(i) *Sulfuric acid plant* means any facility producing sulfuric acid by the contact process.