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Chloride-free potassium sulphate - and pure ammonium chloride - from technical grade potassium chloride (and ammonia gas)
Chloride-free potassium sulphate - and pure ammonium chloride - from technical grade potassium chloride (and ammonia gas)
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机译：不含氯化物的硫酸钾-和纯氯化铵-来自工业级氯化钾（和氨气）
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摘要
Process comprises (1) forming a slurry of technical grade KCl with recycled K2SO4 wash liquor from (5) (2) continuously adding satd. soln. of technical (NH4)2 SO4, with 5-10 mol.% excess until is not 65 wt.% K2SO4 is pptd. (3) introducing gaseous NH3 to saturation at 15-40 (20-25) degrees C to crystallise remaining K2SO4, (4) sepg. the solid, (5) water leaching the K2SO4 in several stages until the K2O content is 51 (52%) and the Cl content is 0.1%, returning the wash liquor to (1). (6) drying the product K2SO4. (7) boiling off NH3 from the K2SO4 mother liquor for recycle to (3). (8) Evapg. off 50-75 (65-70) wt.% H2O, cooling and sepg. the crystallised NH4Cl. (9) Washing the NH4Cl with H2O to 99 (99.4-99.5)% purity and (10) drying.
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机译：该方法包括（1）由（5）中的再循环的K 2 SO 4洗涤液形成工业级KCl的浆液，（2）连续添加饱和的碳酸钙。 soln。加入过量的5-10 mol。％的工业（NH4）2 SO4，直至达到65 wt。％的K2SO4。 （3）在15-40（20-25）摄氏度下将气态NH3引入至饱和状态，以结晶残留的K2SO4，（4）sepg。固体，（5）分几个阶段用水浸出K2SO4，直到K2O含量> 51（52％）和Cl含量为0.1％，使洗涤液返回（1）。 （6）干燥产物K 2 SO 4。 （7）从K 2 SO 4母液中沸腾出NH 3，以再循环至（3）。 （8）evag。除去50-75（65-70）重量％的H 2 O，冷却并分离。结晶的NH4Cl。 （9）用H2O洗涤NH4Cl至纯度> 99（99.4-99.5）％，然后干燥（10）。
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