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分析了钾长石、磷矿、磷酸不同组合反应体系的钾、磷溶出率,并用XRD和FTIR对反应物和产物进行了物相分析。实验结果表明:磷酸不能分解钾长石,但加入磷矿以后,钾长石中钾可以被大量提出;反应分二步,首先是磷酸分解磷矿生成可溶于水的Ca(H2PO4)2和HF,然后HF能分解钾长石,但钾长石中钾的提取主要是Ca(H2PO4)2电离的Ca2+与钾长石中K+发生离子交换反应的结果。实验结果还表明,体系中的氟也会以K2SiF6的形式固定钾而降低钾的溶出率。
The potassium and phosphorus dissolution rates of different combinations of potassium feldspar, phosphate rock and phosphoric acid were analyzed. Phase analysis of reactants and products was carried out by XRD and FTIR. The experimental results show that phosphoric acid can not decompose potash feldspar. However, after adding phosphate rock, potassium in potash feldspar can be put forward in large quantities. The reaction is divided into two steps. Firstly, phosphoric acid decomposes phosphate rock to produce water soluble Ca (H2PO4) 2 and HF, then HF decomposes potassium feldspar. However, the extraction of potassium from potash feldspar is mainly due to the ion exchange reaction between Ca2 + ionized by Ca (H2PO4) 2 and K + in K-feldspar. The experimental results also show that fluorine in the system will also fix potassium in the form of K2SiF6 and reduce the dissolution rate of potassium.