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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Uranium recovery from high-chloride sulphate leach solutions: A cost tradeoff study of using treated water vs. saline water as make-up water
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Uranium recovery from high-chloride sulphate leach solutions: A cost tradeoff study of using treated water vs. saline water as make-up water

机译：从高氯化物硫酸盐浸出溶液中回收铀：使用处理水与盐水作为化妆水的成本权衡研究

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摘要

A well-established technology for uranium recovery comprises sulphuric acid leaching, followed by solvent extraction (SX) with tertiary amines such as Alamine 336. The inherent challenge with uranium processing in arid mining regions, such as Namibia and Australia, is that good quality water sources are in short supply. Supplying water through a desalination facility is a costly solution, and the use of high-salinity water, for example, seawater or saline bore water, could provide an alternative option. However, the presence of chlorides above 3 g/L in the pregnant leach solution hinders uranium loading on the conventional tertiary amine solvent extraction organic. In this paper, the opportunity to utilize high-salinity water (20 g/L Cl~-) as make-up water in the plant is evaluated using two uranium solvent-extraction (SX) recovery options: Option 1 employs a large seawater reverse-osmosis treatment plant for the supply of fresh water throughout the process, together with Alamine 336 organic for SX; option 2 uses saline water for the front-end water requirements, with the chloride-tolerant Cyanex 272 organic for purification and a smaller reverse osmosis plant for fresh water supply downstream of SX. The main focus is the selection of materials of construction as well as the capital and operating expenditure differentials for water treatment and front-end unit operations. A high-level techno-financial trade-off study using cost differentials revealed that a flow sheet incorporating a high-salinity water source is an economical option when mild steel rubber-lined platework and super-duplex SAF2507 steel mechanicals are used.
机译：铀酸盐的良好技术包括硫酸浸出，其次是溶剂萃取（SX），叔胺如雄胺336.干旱采矿区（如纳米比亚和澳大利亚）的固有挑战是良好的水来源供不应求。通过海水淡化设施供水是一种昂贵的解决方案，并且使用高盐水，例如海水或盐水钻水，可以提供替代选择。然而，在妊娠浸出溶液中高于3g / L的氯化物阻碍了常规叔胺溶剂萃取有机物上的铀载荷。在本文中，使用两种铀溶剂 - 萃取（SX）回收方案评估利用高盐度水（20g / L Cl〜）作为植物中的化妆水的机会：选项1采用大型海水反向用于在整个过程中供应淡水的肺部处理厂，与alamine 336有机用于sx;选项2采用盐水进行前端用水要求，氯化物耐受性Cyanex 272有机用于纯化和较小的SX下游淡水供应的较小反渗透厂。主要重点是选择建筑材料以及用于水处理和前端单元操作的资本和经营支出差异。使用成本差异的高级技术金融权衡研究显示，当使用温和的钢橡胶衬里的板块和超级双工SAF2507钢机械时，包含高盐度水源的流量表是一种经济的选择。

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