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直火濃縮回收鎳鹽法,是用廢電解液經兩次蒸發結晶取出CuSO_4·5H_2O後,再放入不溶陽極槽內進行電解,脱銅、砷和銻,以求達到含Cu0.1克/升、As2克/升、Sb0.2克/升以下,再用蒸氣蒸發銅進行濃縮,使含H+600克/升以上(43°Be),放入鈇鍋進行直火濃縮(因為稀酸溶液对铁的腐蝕大,根據苏联规範1立方公尺溶液中含有600公斤酸時已是濃酸溶液,对鉄腐蝕極小)。当水分被大量蒸發,達到55°Be以上的濃酸溶液時鎳鹽从溶液中飽和析出,这就是直火濃縮回收鎳盐的一般过程。但在实踐操作中,它有下列主要的缺點: 一、由於不斷地加熱濃縮,当溶液到達47°Be時,卽開
Direct fire concentrated recovery of nickel salt method is the use of waste electrolyte after two evaporative crystallization remove CuSO_4 · 5H_2O, and then into the insoluble anode tank for electrolysis, decalcification, arsenic and antimony, in order to achieve Cu0.1 g / L, As2 g / L, Sb0.2 g / L or less, and then concentrated by steam evaporation of copper, containing H + 600 g / L or more (43 ° Be) Corrosion of iron solution is large, according to the Soviet Union 1 cubic meter solution contains 600 kg of acid is a concentrated acid solution, the corrosion of 鉄 is minimal). When a large amount of water is evaporated and reaches a concentrated acid solution of 55 ° Be or more, the nickel salt is saturated and precipitated from the solution. This is the general process for direct recovery of nickel salts by direct fire. However, in practical operation, it has the following main disadvantages: First, due to constant heating and concentration, when the solution reaches 47 ° Be,