2018-08-22_REVISION - M1977493A - Laserfiche WebLink

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Technical Revision (TR-28) Climax Molybdenum Company Environmental Protection Plan Permit No. M-1977-493 hazard associated with this product is considered low. Storage and containment during spill will be same as PPG 4000. T-3.2.9 Flocculent Polymer Ventures DAF-30 Flocculent (or similar) is used in the thickeners to facilitate nucleation and settling of light particles. DAF-30 is a non-hazardous, common commercial flocculent. It is a polymer that may irritate the skin or eyes. Impermeable gloves and chemical splash goggles should be utilized when working with the chemical to prevent exposure. If the product is released to the environment, it should be contained with absorbent and removed. It is stored in the mix area on the west end of the mill (Area 430). In the event of a flocculent distribution system failure, the flocculent will be contained within the mill building. T-3.2.10 pH Modifier Calcium Oxide (CaO), also known as lime or quicklime, is used in the flotation circuit at Climax to modify the pH and act as a pyrite depressant. Quicklime is stored in a 225 ton capacity dry silo located on the north side of the mill building (Area 430). Lime is a common, but strong caustic alkali. In high concentrations, lime can cause caustic irritation, inflammation, and burns through inhalation and dermal contact. Quicklime is slaked in the mill and used as a milk of lime slurry. In the event of a lime distribution system failure, the lime will be contained within the mill building. T-3.2.11 Pyrite and Chalcopyrite (Iron and Copper) Depressant Additional depressant products may be utilized at the site in the mill circuit. Sodium cyanide remains a potentially important reagent that may be utilized in low doses in liquid form in the flotation mill circuit to depress pyrite, chalcopyrite, iron, and copper. Although sodium cyanide (cyanide) is not currently utilized at the site, it has been used in the past and may be used in the future If used, it would be delivered and stored in solid briquettes then mixed with water and caustic soda beads (NaOH) to maintain pH 11 for safety. Sodium cyanide is a white solid with a faint almond odor that can affect the human body through inhalation, ingestion, and dermal contact. Cyanide can rapidly cut the flow of oxygen from the blood stream to body tissues. At lower levels of exposure, early symptoms include weakness, headache, confusion, nausea, and vomiting. These symptoms may be followed by unconsciousness and death. Cyanide is rapidly removed from the body by the liver and is neither bioaccumulative nor carcinogenic. Strong solutions of cyanide salts are corrosive and may produce ulcers. Currently, sodium cyanide is not used in the Climax reagent scheme. It has been maintained as a possible depressant if other reagents do not perform adequately. If inclusion of sodium cyanide in the milling process enters further planning stages, Climax will notify the Division with additional information regarding the expected concentration, process solution volumes, storage location, fate of designated chemicals, measures taken to prevent and monitor for a release, and measures taken in the event of a release. T-3.3 Water Treatment Chemicals Information T-3.3.1 Flocculent Climax uses GreatFloc 5500, DAF10 or other chemical equivalents as a flocculent at the SDP and PDWTP to facilitate nucleation and settling of hydroxide precipitates. The flocculants are non-hazardous, common commercial flocculants. The flocculent is an acrylamide polymer that may irritate the skin or eyes. Impermeable gloves and chemical splash goggles should be utilized when working with the chemical to prevent exposure. If the product is released to the environment, it should be contained with absorbent and removed. EPP: Version R4 T-13 August 2018