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硫磷铝锶矿是一种磷酸钙铁铝类磷矿。它不溶于酸和碱,迄今为止尚无合适的磷肥加工工艺路线。本研究证明,硫磷铝锶矿经过煅烧,可以发生两个晶变过程。第一个晶变过程是与矿物脱失结构水同步发生,晶变产物主要是无定形的磷酸铝,完成晶变的温度在600℃—700℃。第二个晶变过程是由无定形的磷酸铝重新结晶形成方英石结构的磷酸铝,晶变温度约在900℃以上。煅烧后的非晶质产物易溶于酸、碱、氟化铵和碱性柠檬酸铵,化学活性显著提高。生物试验表明,在pH 8.6的石灰性土壤上,煅烧后的无定形磷酸铝对小麦有显著增产效果,与等磷量的过磷酸钙相比,相对增产率在85%左右。该磷矿的北部有大面积的石灰性土壤,如将该矿煅烧后在这地区直接施用,预期可得显著效果。这可能是合理利用硫磷铝锶矿的重要途径之一。
Sulfurite aluminum strontium is a calcium phosphate ferroalloy phosphate rock. It does not dissolve in acid and alkali, so far there is no suitable phosphate fertilizer processing route. This study shows that after the parathionite is calcined, two crystal transformation processes can occur. The first crystallization process occurs synchronously with the mineral water loss structure. The crystalline products are mainly amorphous aluminum phosphate, and the temperature at which the crystal transformation is completed is between 600 ℃ and 700 ℃. The second crystallization process is recrystallized from amorphous aluminum phosphate to form cristobalite aluminum phosphate, the temperature of crystallization is about 900 ℃. The calcined amorphous product is easily soluble in acids, bases, ammonium fluoride and basic ammonium citrate, with a marked increase in chemical activity. Biological tests show that calcined amorphous aluminum phosphate has a significant yield increase effect on wheat at pH 8.6 in calcareous soil, and the relative yield increase is about 85% compared with the equivalent phosphorus superphosphate. There is a large area of calcareous soil in the northern part of the phosphate rock, which is expected to have a significant effect if it is calcined directly in this area. This may be one of the important ways to make rational use of parathionite.