| 摘要 |
1. The invention concerns a method of obtaining calcium and magnesium fertilisers enriched with molybdenum from spent pickling solutions produced especially during the manufacture of tungsten strands for light-bulbs, whereas the invention consists in combining the spent pickling solutions with products comprising oxides and carbonates of calcium and magnesium, characterised in that magnesium lime consisting of by weight minimum 10 percent of Mg and 25 percent of Ca in form of oxides and carbonates is placed in rotary reactor, and then the reactor is set to rotate at circumferential speed of 0.4-2.5 m/sec, and spent pickling solutions in temperature 280-350 K are added into the rotating reactor over 1-3 hours, whereas, the amount of the spent pickling solutions added is determined in such a manner that the weight ratio of the added solutions to magnesium lime present in the reactor is between 1:1 and 1:10, and after adding the entire amount spent pickling solutions to rotating reactor, silica gel is added in the amount of 1-5 percent by weight with relation to the total charge, whereas, silica gel is added to the reactor in not less than two batches, and after adding the last batch , the reactor rotation is maintained for 15 minutes at least.
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