The leaching behavior of metals from a pressure-leaching slag was investigated using a desulphurization-leaching-hydrolysis process for the recovery of bismuth and antimony.Various parameters were studied,including th...The leaching behavior of metals from a pressure-leaching slag was investigated using a desulphurization-leaching-hydrolysis process for the recovery of bismuth and antimony.Various parameters were studied,including the amount of acid added,temperature,time,addition of NaCl and solid-liquid ratio in the leaching process.The experimental results show that the contents of bismuth and antimony are mostly enriched in the process of kerosene desulphurization.More than 98% Sb and 96% Bi are extracted under the determined conditions.In the process of hydrolysis,the precipitation rates of bismuth and antimony are 97.80% and 94.59%,respectively.Under the optimum experimental conditions,the recovery rate of bismuth and antimony can be up to 95.80% and 90.80%,respectively.展开更多
The pressure nitric acid leaching of alkali-pre- treated low-grade limonitic laterite, as well as removing impurity AI（III） and preparing intermediate product of nickel/cobalt sulphide from leaching liquor were inve...The pressure nitric acid leaching of alkali-pre- treated low-grade limonitic laterite, as well as removing impurity AI（III） and preparing intermediate product of nickel/cobalt sulphide from leaching liquor were investi- gated. After pretreatment, iron exists in the form of amorphous iron oxides, while nickel is adsorbed on the surface of iron oxides in the form of nickel oxide. The preferable pressure leaching conditions are determined as follows： leaching temperature of 458 K, leaching duration of 60 min, initial acidity of nitric acid of 1.90 mol.L-~ and liquid to solid ratio of 3：1 （volume to mass ratio）. Under these conditions, the leaching efficiencies of Ni, Co and A1 are 95 %, 88 % and 55 %, respectively, and that of Fe is less than 1%. The loss rates of Ni and Co are 1.8 % and 1.5 %, respectively, during the step of removing impurity AI（III）. The sulphide precipitation process produces the interim production of nickel/cobalt sulphides, recovering greater than 99 % of Ni and Co in the purified solution. The iron-rich （〉60 %） pressure leaching residue with low Cr, S can be further reclaimed as the raw materials for iron making.展开更多
基金financially supported by the National Natural Science Foundation of China (No.51072233)
文摘The leaching behavior of metals from a pressure-leaching slag was investigated using a desulphurization-leaching-hydrolysis process for the recovery of bismuth and antimony.Various parameters were studied,including the amount of acid added,temperature,time,addition of NaCl and solid-liquid ratio in the leaching process.The experimental results show that the contents of bismuth and antimony are mostly enriched in the process of kerosene desulphurization.More than 98% Sb and 96% Bi are extracted under the determined conditions.In the process of hydrolysis,the precipitation rates of bismuth and antimony are 97.80% and 94.59%,respectively.Under the optimum experimental conditions,the recovery rate of bismuth and antimony can be up to 95.80% and 90.80%,respectively.
基金financially supported by the National Natural Science Foundation of China (Nos. 51274044, 51304023, and U1302274)
文摘The pressure nitric acid leaching of alkali-pre- treated low-grade limonitic laterite, as well as removing impurity AI（III） and preparing intermediate product of nickel/cobalt sulphide from leaching liquor were investi- gated. After pretreatment, iron exists in the form of amorphous iron oxides, while nickel is adsorbed on the surface of iron oxides in the form of nickel oxide. The preferable pressure leaching conditions are determined as follows： leaching temperature of 458 K, leaching duration of 60 min, initial acidity of nitric acid of 1.90 mol.L-~ and liquid to solid ratio of 3：1 （volume to mass ratio）. Under these conditions, the leaching efficiencies of Ni, Co and A1 are 95 %, 88 % and 55 %, respectively, and that of Fe is less than 1%. The loss rates of Ni and Co are 1.8 % and 1.5 %, respectively, during the step of removing impurity AI（III）. The sulphide precipitation process produces the interim production of nickel/cobalt sulphides, recovering greater than 99 % of Ni and Co in the purified solution. The iron-rich （〉60 %） pressure leaching residue with low Cr, S can be further reclaimed as the raw materials for iron making.
