某铜钼尾矿中长石回收及其低温分解试验研究

Experimental Study on Recovery and Low-Temperature Decomposition of Feldspar from a Copper-Molybdenum Tailings

某铜钼尾矿中K_(2)O质量分数为6.18%,长石占比44.7%,以该铜钼尾矿为原料,采用“磁选-浮选”工艺回收长石,并对长石开展低温分解试验研究。结果表明,较优的分解条件为:采用质量分数为45%的氢氧化钠溶液,氢氧化钠溶液用量为钾长石用量的0.63倍,反应温度为240℃,反应时间为4 h。在该分解条件下,氧化钾溶出率达到91.37%,氧化铝溶出率为3%,二氧化硅溶出率为66%。

The mass fraction of K2_(O) in a copper-molybdenum tailings is 6.18%,and feldspar accounts for 44.7%.Using the copper-molybdenum tailings as raw materials,the"magnetic separation-flotation"process is used to recover the feldspar and the low-temperature decomposition test research on the feldspar is carried out.The results show that the optimal decompositon conditions are as follows:sodium hydroxide mass fraction is 45%,the alkali dosage is 0.63 times of potassium feldspar dosage,the reaction temperature is 240℃ and the reaction time is 4 hours.Under these decomposition conditions,the dissolution rate of potassium oxide reaches 91.37%,the dissolution rate of alumina is 3%,and the dissolution rate of silicon oxide is 66%.