一种焦化含硫废水的资源化处理方法

Resource process method for coking sulfur-containing waste water

Abstract

The invention relates to a method for resourceful treatment of coking sulfur-containing wastewater. The coking sulfur-containing wastewater is added into a microfiltration or ultrafiltration membrane separator, solid elemental sulfur contained in the wastewater is entrapped and condensed, and is subject to the washing purification to produce pure sulfur; penetrating fluid is led into a nanofiltration membrane separator, ammonium thiosulfate is entrapped and condensed, and is extracted to produce the ammonium thiosulfate; then the penetrating fluid is led into a reverse osmosis membrane separator, ammonium thiocyanate is trapped and condensed, and is extracted to produce the ammonium thiocyanate, wherein, the penetrating fluid is purified water and can be returned to the working section for repeated use. The method can separate and purify valuable sulfur and secondary salt in the coking sulfur-containing wastewater to create certain economic value, can also improve the circulating utilization rate of industrial water to realize zero draining of wastewater and achieve the requirement of cyclic economy, and is suitable for treating the coking sulfur-containing wastewater of desulfurization and decyanization processes using a HPF method of various coking gas.
本发明涉及一种焦化含硫废水的资源化处理方法,将焦化含硫废水通入微滤或超滤膜分离器,废水中所含固体单质硫被截留并浓缩,经水洗纯化后得到纯硫磺;将渗透液通入纳滤膜分离器,硫代硫酸铵被截留并浓缩,经提取得到硫代硫酸铵;再将该渗透液通入反渗透膜分离器,硫氰酸铵被截留并浓缩,经提取得到硫氰酸铵,渗透液为净化水,可返回前述工段循环使用。该方法既可以将焦化含硫废水中有价值的硫和副盐分离提纯出来,创造一定经济价值,又可以提高工业用水的循环利用率,实现废水零排放,达到循环经济要求,适用于处理各种焦炉气的HPF法脱硫脱氰工艺的焦化含硫废水。

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