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Laboratory Revision Number: 6 <br /> Simplot Standard Operating Procedure Revision Date: 09/22/2022 <br /> Procedure Number: <br /> Lab Material Handling-R6 I <br /> Lab Material Handling Page 3 of 7 <br /> b. Recycling of Plant QC Samples <br /> i. When possible, the remaining portions of samples provided to the laboratory for <br /> analysis should be recycled back into their respective plants. <br /> ii. Dry samples go into the appropriate drum outside of QC lab against south wall. <br /> 1) Any samples from Blends that are colored, or polymer coated must go in the <br /> drum for colored rejects. These cannot be recycled back into the Pellet Plant. <br /> 2) The Pellet Plant bin may be used for: <br /> a) Pellet Plant product <br /> b) Ammonium Sulfate <br /> c) Pellet Plant Raw Materials <br /> d) Straight Product Work Order retained samples <br /> iii. Phosphoric acid samples are to be emptied into a 1-gallon plastic containers which <br /> are recycled into the phosphoric acid sump. <br /> 1) The phosphoric acid sample bottles are then soaked with hot water until the <br /> solids on the bottom of the container can be brushed into solution and then <br /> recycled with the phosphoric acid. <br /> iv. Sulfuric acid samples (98% & 93%) are to be emptied into 2.5 L glass bottles. <br /> That are kept in polyethylene bottle carriers. When full, the containers are taken to <br /> the acid plant for recycling by the acid plant operators. <br /> 1) 50% and lower concentrations of sulfuric acid should be kept in separate 2.5 <br /> L glass bottles to be used for neutralizing lab solutions, and for preparing <br /> -70% sulfuric acid. <br /> 2) When cleaning the sulfuric acid sample bottles, the first three sample rinses <br /> of the sulfuric acid bottles and caps should be put into a container for <br /> neutralization. The bottles and caps should then be soaked in a dilute sodium <br />