Magnesium hydroxide recovery technology: environmental protection and resource utilization of magnesium sulfate wastewater
In the chemical industry, the treatment and resource recovery of magnesium sulfate wastewater are key links in achieving sustainable development. Magnesium hydroxide [Mg(OH)₂], as a high-value chemical raw material, plays an important role in the recovery of magnesium sulfate wastewater. This article will discuss the recovery technology of magnesium hydroxide and its application in environmental protection and resource utilization.
Innovation of process flow
Pretreatment: Preliminary treatment of magnesium sulfate wastewater to remove suspended matter and adjust pH value to prepare for subsequent precipitation reaction.
Lime milk reaction: Add lime milk to wastewater to generate calcium sulfate and magnesium hydroxide precipitates through chemical reaction to achieve calcium and magnesium resource recovery.
Precipitation separation: Separate calcium sulfate and magnesium hydroxide precipitates from the solution by precipitation, filtration or centrifugation technology.
Post-processing process: Wash and dry the separated magnesium hydroxide to improve its purity and meet the needs of different application fields.
Technical points and challenges
Optimization of reaction conditions: Determine the optimal amount of lime milk added, reaction temperature and time through experiments to improve the recovery efficiency and purity of magnesium hydroxide.
By-product quality control: Ensure the purity and particle size of magnesium hydroxide to meet the requirements of high-end applications.
Energy consumption and cost considerations: Pay attention to energy consumption issues in process design, reduce operating costs and improve economy.
Environmental protection measures: Ensure that the treatment process minimizes secondary pollution and complies with environmental regulations.
Research progress
In recent years, researchers have continuously explored more efficient magnesium hydroxide recovery technologies, such as using new flocculants, optimizing precipitation processes, and developing continuous production equipment to maximize resource recovery and efficient purification of wastewater.
At the same time, the research also focuses on the high-value-added conversion of magnesium hydroxide, such as conversion into other magnesium compounds, to broaden its application range.
The recovery technology of magnesium hydroxide provides an effective way for the environmental protection treatment and resource utilization of magnesium sulfate wastewater. Through process optimization and technological innovation, not only can the recovery efficiency of magnesium hydroxide be improved, but also significant economic and environmental benefits can be brought to multiple industries such as chemicals, building materials, and agriculture.