| 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.