Research on Preparation of Fine Carnallite by Screening-reverse Flotation Combined with Impurity Removal
The high impurity carnallite from Qarhan Salt Lake is difficult to be used because of its poor quality.Therefore,taking the carnallite as raw material,the impurity removal tests were carried out by us-ing the reverse flotation process and the combined process of sieving off fine particles and then reverse flota-tion.The results showed that compared with the reverse flotation process,56.36％/41.22％sodium impuri-ties and 92.56％/87.79％calcium impurities can be removed by pre-removal of-0.088 mm/-0.074 mm fine particles,and then the removal rate of Na+and Ca2+is more than 90％by combining with the reverse flota-tion process.After removing impurities,the K+grade of refined carnallite is 1.1 times higher than the raw ore,the quality can meet the following production requirements and enable the carnallite to be used in pro-duction.The process can also significantly reduce the dosage of reagent.It has a great advantage in product quality and dressing cost.
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