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The behaviour of phosphate during jarosite precipitation

机译：黄钾铁矾沉淀过程中磷酸盐的行为

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The behaviour of phosphate during the precipitation of sodium jarosite and potassium jarosite was investigated. At 97,98 or 150 °C, single-phase PO_4-bearing sodium jarosite or potassium jarosite precipitated from Fe(SO_4)_(1.5) solutions containing less than about 4 g/L PO_4. Higher PO_4 concentrations resulted in the co-precipitation of other phosphate species. Phosphate is preferentially precipitated relative to sulphate under all conditions. The products formed from solutions having a constant PO_4 concentration and containing >0.15 M Fe(SO_4)_(1.5) consisted of PO_4-bearing sodium jarosite. The precipitates from more dilute Fe(SO_4)_(1.5) solutions consisted of an amorphous phase plus sodium jarosite. Different behaviours were observed when the Fe(SO_4)_(1.5)/PO_4 ratio of the solutions was kept constant; these precipitates were only PO_4-bearing sodium jarosite. At temperatures <170 °C, in the presence of 1.8 g/L PO_4, only PO_4-bearing sodium jarosite was detected. At 98 °C, PO_4-bearing sodium jarosite was produced over the pH range from 1.0 to 2.0. At 150 °C, PO_4-containing potassium jarosite was produced, but all the precipitates were contaminated with an unknown phosphate species. The precipitates made in predominantly chloride media were similar to those formed under comparable conditions in the all-sulphate systems. Single phase PO_4-containing sodium jarosite or potassium jarosite precipitated from chloride solutions containing <3 g/L PO_4, but the precipitates formed from more concentrated PO_4 solutions were contaminated with other phosphate species. Detailed mineralogical studies indicated a limited degree of PO_4 solid solution in both sodium jarosite and potassium jarosite, with PO_4 contents of 5-6% being achieved. It seems that the PO_4~(3-) anion substitutes for SO_4~(2-) in the jarosite structure, and that the limited extent of substitution is mostly limited by the different charges on the PO_4~(3-) and SO_4~(2-) anions.
机译：研究了黄钾铁矾和黄钾铁矾沉淀过程中磷酸盐的行为。在97,98或150°C下，单相含PO_4的黄钾铁矾或黄钾铁钾从Fe（SO_4）_（1.5）溶液中含少于约4 g / L PO_4沉淀出来。较高的PO_4浓度导致其他磷酸盐种类的共沉淀。在所有条件下，磷酸盐相对于硫酸盐优先沉淀。由具有恒定PO_4浓度并包含> 0.15 M Fe（SO_4）_（1.5）的溶液形成的产物由含PO_4的黄钾铁矾组成。 Fe（SO_4）_（1.5）稀溶液中的沉淀物由无定形相和黄钾钠组成。当溶液的Fe（SO_4）_（1.5）/ PO_4比率保持恒定时，观察到不同的行为。这些沉淀物只是含PO_4的黄钾钠。在<170°C的温度下，在存在1.8 g / L PO_4的情况下，仅检测到含PO_4的黄钾钠钠。在98℃下，在1.0至2.0的pH范围内产生了含PO 4的黄钾钠。在150°C，产生了含PO_4的黄钾铁矾，但所有沉淀物均被未知的磷酸盐所污染。在主要为氯化物的介质中产生的沉淀与在全硫酸盐体系中在相当条件下形成的沉淀相似。从含<3 g / L PO_4的氯化物溶液中沉淀出含PO_4的单相黄钾钠或黄钾钾钾盐，但由浓度更高的PO_4溶液形成的沉淀物却被其他磷酸盐所污染。详细的矿物学研究表明，在黄钾铁矾钠和黄钾铁矾钾中，PO_4固溶体的含量均有限，PO_4的含量为5-6％。看来在黄钾铁矾结构中，PO_4〜（3-）阴离子替代了SO_4〜（2-），并且有限的取代程度主要受PO_4〜（3-）和SO_4〜（ 2-阴离子。

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