Code of Federal Regulations > Title 40 > Chapter I > Part 63 > Subpart NNNNNN > Appendix - Table 1 to Subpart NNNNNN of Part 63

Regulations last checked for updates: Nov 22, 2024

Title 40 - Protection of Environment last revised: Nov 20, 2024

Appendix - Table 1 to Subpart NNNNNN of Part 63—HAP Emissions Sources

Process	Emissions sources
1. Sodium chromate production	a. Ball mill used to grind chromite ore.
	b. Dryer used to dry chromite ore.
	c. Rotary kiln used to roast chromite ore to produce sodium chromate.
	d. Secondary rotary kiln used to recycle and refine residues containing chromium compounds.
	e. Residue dryer system.
	f. Quench tanks.
2. Sodium dichromate production	a. Stack on the electrolytic cell system used to produce sodium dichromate.
	b. Sodium dichromate crystallization unit.
	c. Sodium dichromate drying unit.
3. Chromic acid production	a. Electrolytic cell system used to produce chromic acid.
	b. Melter used to produce chromic acid.
	c. Chromic acid crystallization unit.
	d. Chromic acid dryer.
4. Chromic oxide production	a. Primary rotary roasting kiln used to produce chromic oxide.
	b. Chromic oxide filter.
	c. Chromic oxide dryer.
	d. Chromic oxide grinding unit.
	e. Chromic oxide storage vessel.
	f. Secondary rotary roasting kiln.
	g. Quench tanks.
5. Chromium hydrate production	a. Furnace used to produce chromium hydrate.
	b. Chromium hydrate grinding unit.

As required in § 63.11411(a), you must comply with the requirements of the General Provisions (40 CFR part 63, subpart A) as shown in the following table.

authority: 42 U.S.C. 7401

source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.