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Mill Chemicals Page 2 Description, Use, Purpose 7872 Anionic flocculant. Liquid from Nalco Chemical Company. Added as a 1% solution to the lead thickener feed. functions as a bridging mechanism to bring mineral particles together so they settle faster. Sodium NaOH. Solid beads from various suppliers. Added directly to the grinding hydroxide phase of amalgamation. Functions as a strong alkali to dissolve or decompose organic contaminants in the gravity concentrate. Sodium C6H1107Na. food additive, solid powder from various suppliers Added gluconate directly to the grinding phase of amalgamation. Functions as a cleaning agent to help remove oxide stains from the gold particle surfaces. lead Pb(N03)2. Solid crystals or powder from China. Added directly to the Nitrate grinding phase of amalgamation. Functions as a source of positive ian to consume sulphide ion and thus prevent sickening of mercury, H18C Methyl Isohuty! Carbinol (or Methyl Amyl Alcohol, liquid) Same: function as Dowfro[h 250 fro[her, currently being mixed with 250 and water for stage feeding throughout the flotation circuit.. NHyCI Ammonium Chloride. Solid powder added directly to the grinding phase of amalgamation. Functions the same as sodium gluconate In re:moving stains from gold particles thus enhancing contact with mercury. Mercury Liquid mercury added directly to the slow grinding phase of amalgamation (which follows the grinding phase with chemicals). Recovers !lold by forming a solid solution with it (amalgam), the combination then recovered from the pulp using elutriation. Na2Cr207 Su~ium Dichromate. Solid granules or powder added as a 10$ s~~lution to the conditioning stage prior to lead/copper separation. Functions as a depressant for the lead mineral galena. Na2SH'H20 Sodium Hydrosulfide. Solid flakes added as a 20$ solution to the tailings pulp. Functions as a reducing agent for Cr+6 ions (from lead/copper or separation), changing them to Cr+j so [hat they will precipitate from Na2S solution with other heavy metal tons, as mandated by the water quality requirements at the tailings pond.