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Precious Metals Recovery LLC RCRA Permit Application Dry Hills ...

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This salt solution will be sent to the process waste solution treatment system discussed below in<br />

Section 1.2.7. The scrubbed gas will flow through a mist eliminator located at the top of the<br />

scrubber before being drawn through an induced draft (ID) fan and discharged to the atmosphere.<br />

When treating calomel filter cake, SO2 is not expected in the off-gas. The gas can bypass the SO2<br />

scrubber through the SO2 Scrubber Bypass Line, and discharge directly to the atmosphere via the<br />

exhaust duct. A block diagram illustrating the retort off-gas system is depicted in Figure 1.2-6.<br />

Feed<br />

N2<br />

Retort<br />

O2 + Air<br />

Afterburner<br />

S + O2 SO2<br />

Figure 1.2-6: Block Diagram of the Retort Off-gas System<br />

Other low volume mercury-bearing materials may be retorted to recover mercury on a periodic<br />

basis (e.g., tools, drums, and other contaminated debris and media).<br />

1.2.5 Process Water<br />

Spent Carbon<br />

Fresh water will be trucked to the proposed TSF compound from an off-site source and will be<br />

used as makeup water for the treatment processes and maintenance of the proposed TSF<br />

compound. Process water will be supplied from the fresh water tank to meet the process water<br />

demand outlined in Section 1.2.7.<br />

1.2.6 Hygiene Exhaust System<br />

Both the spent activated carbon and calomel treatment systems will be located in the process area<br />

of the proposed TSF. This area will be separated by concrete walls from the rest of the building.<br />

Local ventilation hoods will provide worker protection, and will capture any emissions generated<br />

during material transfers at the following locations:<br />

Above the filter press and at the filter cake discharge.<br />

Above the retort dome.<br />

Condenser<br />

Hg(v) Hg(l)<br />

Hg(l) to storage<br />

Fresh Carbon<br />

Activated Carbon<br />

Filters<br />

Hg + S HgS<br />

Retort Vacuum<br />

Pump<br />

Sulphur Dioxide<br />

Scrubber<br />

SO2 + 2NaOH<br />

Na2SO3 + H2O<br />

Na2SO3 to Oxidation Tank<br />

PMR <strong>RCRA</strong> <strong>Permit</strong> <strong>Application</strong>, <strong>Dry</strong> <strong>Hills</strong> Facility Page 28<br />

JBR Environmental Consultants, Inc. | HATCH March 2013<br />

NaOH<br />

Vendor Package (MRT) Vendor Package<br />

Retort Off-gas<br />

Fan

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