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Electronic Code of Federal Regulations

e-CFR data is current as of January 16, 2020

Title 40Chapter ISubchapter CPart 63Subpart NNNNNN → Appendix


Title 40: Protection of Environment
PART 63—NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES (CONTINUED)
Subpart NNNNNN—National Emission Standards for Hazardous Air Pollutants for Chemical Manufacturing Area Sources: Chromium Compounds


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

ProcessEmissions sources
1. Sodium chromate productiona. 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 productiona. Stack on the electrolytic cell system used to produce sodium dichromate.
   b. Sodium dichromate crystallization unit.
   c. Sodium dichromate drying unit.
3. Chromic acid productiona. 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 productiona. 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 productiona. 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.

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