摘要
焦化脱硫废液主要含硫氰酸铵、硫代硫酸铵和硫酸铵。从预处理后的脱硫废液浓缩副盐入手,首先采用醇溶剂溶解其中的硫氰酸铵,对其进行过滤,将滤液浓缩干燥得到硫氰酸铵产品;然后将滤饼加水溶解,并加入氧化钙,将硫酸铵转化为硫酸钙,之后将滤液浓缩干燥得到硫代硫酸铵产品。采用该工艺流程对脱硫废液处理,得到的硫氰酸铵产品纯度达98%以上,硫代硫酸铵产品纯度达96%以上。分别采用甲醇、乙醇溶剂对浓缩副盐进行处理,并通过对比,确定了最佳分离溶剂及操作条件。
The desulphurization wastewater from coking process mainly contains ammonium thiocyanate, ammonium thiosulfate and ammonium sulfate. After pretreatment, alcohols are firstly used to dissolve ammonium thiocyanate component. The filtration, concentration and drying steps are then employed to achieve pure ammonium thiocyanate. Subsequently, the filtrated cake is dissolved by water to convert ammonium sulfate into calcium sulfate through adding calcium oxide. The ammonium thiosulfate product is then obtained after filtration, concentration and drying. The desulphurization wastewater is also treated by the technology addressed above. The purity of obtained ammonium thiocyanate and ammonium thiosulfate products is over 98% and 96%, respectively. Ethanol and methanol are chosen to separate the concentrate of the desulfurization wastewater. The optimum solvent and the operating conditions are determined by comparison.
出处
《现代化工》
CAS
CSCD
北大核心
2015年第11期64-66,68,共4页
Modern Chemical Industry
关键词
HPF
脱硫废液
提盐
HPF
desulfurization wastewater
separation of salts
