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首页> 外文期刊>Separation and Purification Technology >Preparation of chloride-free potash fertilizers by electrodialysis metathesis
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Preparation of chloride-free potash fertilizers by electrodialysis metathesis

机译：用电渗析复分解制备无氯钾肥肥料

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摘要

Traditional preparation processes of chloride-free potash fertilizers (KNO3, K2CO3 and K2SO4) have certain limitations, such as complicated operation and existing potential pollution. In this work, electrodialysis metathesis (EDM) was used to prepare these fertilizers using KCl and acid radical salt (nitrate, carbonate and sulfate) as raw materials. Firstly, as current density increases from 10 to 25 mA/cm(2), energy consumption grows from 0.41 to 0.64 kW h/kg KNO3, while KNO3 product purity improves from 92.36 to 95.91 wt%. Secondly, different sulfate sources, such as MgSO4, Na2SO4 and (NH4)(2)SO4, were used to investigate the effects of cation species, showing that the orders of energy consumption and impurity cations in product are E-MgSO4 E-Na2SO4 E(NH4)2SO4 and W-NH4 W-Na W-Mg, and (NH4)(2)SO4 is regarded as the suitable sulfate source. Thirdly, NaNO3, Na2CO3 and Na2SO4 were selected to investigate the effects of anion species. The order of average energy consumption is (K) over bark(2CO3) (K) over bar (K2SO4) approximate to (K) over bar (KNO3), while that of average current efficiency is (eta) over bar (K2SO4) (eta) over bar (K2CO3) (eta) over bar (KNO3) Besides, compared with other two fertilizers, generated KNO3 product purity is comparatively higher. Finally, economic evaluation results showed that EDM has great potential applications in preparing chloride-free potash fertilizers, especially for KNO3 and K2CO3.
机译：无氯化物钾肥（KNO3，K2CO3和K2SO4）的传统制备方法具有一定的限制，例如复杂的操作和现有的潜在污染。在这项工作中，电渗析复分解（EDM）用于使用KCl和酸性自由基盐（硝酸盐，碳酸盐和硫酸盐）作为原料制备这些肥料。首先，随着电流密度从10到25 mA / cm（2）增加，能量消耗从0.41到0.64 kW h / kg KNO3增长，而KNO3产品纯度可提高92.36至95.91wt％。其次，使用不同的硫酸盐来源，例如MgSO4，Na 2 SO 4和（NH 4）（2）SO4来研究阳离子物种的影响，表明产物中的能量消耗和杂质阳离子是E-MgSO 4＆GT; E-Na2SO4＆ E（NH4）2SO4和W-NH4＆GT; w-na＆ W-Mg，（NH 4）（2）SO4被认为是合适的硫酸盐源。第三，选择纳米3，Na 2 CO 3和Na 2 SO 4以研究阴离子物种的影响。平均能耗的顺序是（k）在树皮上（2co3）＆ （k）在酒吧（K2SO4）上方（K2SO4）上方（KNO3），而平均电流效率的情况是（ETA）上方（K2SO4）＆GT; （ETA）在酒吧（K2CO3）＆ （ETA）除了酒吧（KNO3）外，与其他两种肥料相比，产生的KNO3产品纯度相对较高。最后，经济评价结果表明，EDM在制备无氯钾肥方面具有巨大的潜在应用，特别是对于KNO3和K2CO3。

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