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<br />• Pregnant Liquor Storage <br />Pregnant Liquor will be delivered from the mine to a storage tank <br />at the plant site. <br />The tank provides one hour surge at design rate (125,000 TPY). <br />The storage tank is insulated for energy conservation and to <br />prevent cooling and premature crystallization of bicarb. Glycol <br />heated plate coil heat exchangers on the tank wall are provided to <br />maintain temperature during an extended shut down. <br />Crystallization <br />Sodium bicarbonate is precipitated by cooling the pregnant liquor. <br />Cooling and crystallization is accomplished in four stages in <br />• series. The crystallizers are flat bottom vessels with mechanical <br />agitators. crystallizers No's 1 and 2 will be insulated for <br />thermal efficiency. crystallizers No's 3 and 4, will be insulated <br />as required for personnel protection. <br />The crystallizer feed streams are cooled using external plate and <br />frame type heat exchangers. Feeds to crystallizers No's 1, 2, and <br />3 are cooled by counter current flow of the barren liquor. <br />Crystallizer No. 4 feed is cooled with cooling tower water. <br />The barren liquor tank provides one hour surge at design rate. <br />The tank is covered and insulated for energy conservation. <br /> <br />8 <br />