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发明公开
CN109516628A 一种从高镁低钙电厂废水中提取硫酸镁的方法 无效 - 撤回

一种从高镁低钙电厂废水中提取硫酸镁的方法
摘要：
本发明公开了一种从高镁低钙电厂废水中提取硫酸镁的方法，属于水处理技术领域。所述一种从高镁低钙电厂废水中提取硫酸镁的方法，包括：软化除钙步骤：向高镁低钙电厂废水中加入除钙剂，经过滤后得到除钙废水；成分调整步骤：向所述除钙废水中加入硫酸盐使得镁离子与硫酸根离子的摩尔比为0.9-1.1，得到成分调整后的废水；蒸发浓缩步骤：将所述成分调整后的废水进行蒸发浓缩，得到浓缩后的废水；冷却结晶步骤：将所述浓缩后的废水进行冷却结晶，过滤，得到硫酸镁固体。本发明一种高镁电厂废水资源化利用方法可以有效的去除水中的钙离子，充分利用镁离子，预处理加药成本大大降低，且所需工艺流程较短，设备投资少。
摘要（英）：

The invention discloses a method for extracting magnesium sulfate from high-magnesium low-calcium power plant wastewater and belongs to the technical field of water treatment. The method for extracting magnesium sulfate from high-magnesium low-calcium power plant wastewater comprises the softening and calcium removing step: adding a calcium removing agent into the high-magnesium low-calcium powerplant wastewater and filtering to obtain calcium removed wastewater; the ingredient adjusting step: adding sulfate into the calcium removed wastewater to enable the molar ratio of magnesium ions to sulfate ions to be 0.9 to 1.1 to obtain ingredient adjusted wastewater; the evaporating and concentrating step: evaporating and concentrating the ingredient adjusted wastewater to obtain the concentrated wastewater; and the cooling and crystallizing step: cooling and crystallizing the concentrated wastewater and filtering to obtain magnesium sulfate solid. The high-magnesium power plant wastewater resourceful utilization method disclosed by the invention can effectively remove calcium ions in water, the magnesium ions are fully utilized, and pretreatment and chemical adding cost is greatly reduced; furthermore, a required technological process is short, and equipment investment is small.

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