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公开(公告)号：US4541994A
公开(公告)日：1985-09-17
申请号：US516237
申请日：1983-07-22
CPC分类号： C22B23/043 , Y02P10/212
摘要： According to the present invention, Ni- and Co-rich, low Mg fines may be advantageously separated from the coarse fractions of lateritic ores by atmospheric or low pressure leaching. In particular, the process of the present invention comprises contacting a lateritic ore or ore fraction at temperatures from about 20.degree. C. to about 200.degree. C. and pressures from about atmospheric to about 200 psig with an aqueous acid solution to form a leach liquor, a leach residue and a fines fraction. The fines fraction which can be separated from the residue with the leach liquor by conventional means such as cycloning is found to be richer in Ni and Co and lower than the remainder of the residue.
摘要翻译： 根据本发明，通过大气或低压浸出，可以有利地将镍和富钴低Mg细粒与红土矿石的粗级分离。 特别地，本发明的方法包括使用酸水溶液使红土矿石或矿石馏分在约20℃至约200℃的温度和约大气压至约200psig的压力下接触以形成浸出液 ，浸出残渣和细粉碎部分。 发现通过常规方法例如旋风可以用浸出液与残留物分离的细粒分数在Ni和Co中更富，并且低于其余残余物。
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公开(公告)号：US4548794A
公开(公告)日：1985-10-22
申请号：US516236
申请日：1983-07-22
CPC分类号： C22B23/0469 , C22B23/043 , Y02P10/212
摘要： According to the present invention, processes are provided for recovery of nickel, cobalt and like metal values from laterite ores wherein the ores are separated into high and low magnesium containing fractions, the low magnesium fraction is leached with sulfuric acid at elevated temperatures and pressure to solubilize the metal values. The pregnant liquor resulting from the high pressure which also contains solubilized Fe, Al and acid is then contacted with a low magnesium fraction of the ore in a low pressure leach under conditions such that at least some of the acid is neutralized and substantially all of the solubilized Fe and Al is removed as hematite and alunite precipitate.In one embodiment, the pregnant liquor from the high pressure leach and the high magnesium fraction are contacted at atmospheric pressure and a temperature of about 80.degree. C. prior to low pressure leaching. In other embodiments, various process streams are separated by size and otherwise, and recycled to within the processes.In another embodiment, all leached values, including magnesium and sulfuric acid, are recovered, resulting in a dischargeless process which is environmentally and economically acceptable. Elimination of prior art iron and aluminum contaminants by the low pressure leach provides a simplified method of recovery of all elements in the leachate.
摘要翻译： 根据本发明，提供了从红土矿石中回收镍，钴等金属值的方法，其中矿石被分离成高和低含镁的馏分，低镁馏分在高温和高压下被硫酸浸出 溶解金属值。 然后在高压下产生的含有溶解的Fe，Al和酸的怀孕液体在低压浸出液中与矿石的低镁馏分接触，使得至少一些酸被中和，并且基本上全部 溶解的Fe和Al作为赤铁矿和Alunite析出。 在一个实施方案中，来自高压浸出的怀孕液和高镁级分在低压浸出之前在大气压和约80℃的温度下接触。 在其他实施方案中，各种工艺流通过尺寸和其他方式分开，并被再循环到工艺中。 在另一个实施方案中，回收所有浸出的值，包括镁和硫酸，导致无环境和无经济可接受的方法。 通过低压浸出法消除现有技术的铁和铝污染物提供了回收渗滤液中所有元素的简化方法。
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公开(公告)号：US4273745A
公开(公告)日：1981-06-16
申请号：US81412
申请日：1979-10-03
CPC分类号： C01G39/003 , C01G39/02 , C01P2006/80
摘要： Molybdenum is recovered from an ammonium molybdate solution containing phosphate anions by digesting in an ammonium molybdate solution at least one water-soluble compound of at least one metal selected from the group consisting of aluminum, calcium, iron and magnesium in small but effective amounts to precipitate at least about 50% of the phosphate anions for a time sufficient to precipitate the phosphate anion, separating the phosphate precipitate from the ammonium molybdate solution, then acidifying the ammonium molybdate solution with at least one mineral acid selected from the group consisting of sulfuric acid and nitric acid to lower the pH value of the solution to between about 2.5 and about 4.5 to precipitate ammonium polymolybdate, and calcining the ammonium polymolybdate at a temperature below about 750.degree. C. to produce a molybdenum trioxide product.
摘要翻译： 通过在钼酸铵溶液中消化至少一种选自铝，钙，铁和镁的至少一种金属的水溶性化合物，以少量但有效的量沉淀，从含有磷酸根阴离子的钼酸铵溶液中回收钼 至少约50％的磷酸盐阴离子足以沉淀磷酸盐阴离子，将钼酸铵溶液中的磷酸盐沉淀物分离出来，然后用至少一种无机酸酸化钼酸铵溶液，所述无机酸选自硫酸和 硝酸以将溶液的pH值降低至约2.5至约4.5之间以沉淀多钼酸铵，并在低于约750℃的温度下煅烧多钼酸铵以产生三氧化钼产物。
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