Impinging stream reaction-precipitation method: Green preparation process of ultrafine magnesium hydroxide powder
Magnesium hydroxide (Mg(OH)₂), as a versatile inorganic non-metallic material, plays an important role in many industries. Traditional preparation methods have problems of low efficiency and unstable product quality. This article will explore an innovative impinging stream reaction-precipitation method for the preparation of ultrafine magnesium hydroxide powder. This method has brought revolutionary changes to the production of magnesium hydroxide with its high efficiency, controllability and environmental protection.
In modern industry, magnesium hydroxide is widely used in flame retardants, catalyst carriers, environmentally friendly materials and medicine due to its excellent performance. However, traditional preparation methods are often accompanied by problems of high energy consumption and unstable product quality. In order to solve these problems, scientists have developed the impinging stream reaction-precipitation method, which is a new preparation technology that produces a strong turbulent effect through the collision of high-speed flowing liquids or gases, thereby achieving rapid mixing and reaction of reactants.
Principle of the impinging stream reaction-precipitation method
The core of the impinging stream reaction-precipitation method is to use the turbulent effect generated by the collision of high-speed flowing liquids or gases. This effect can significantly increase the reaction rate and make the magnesium hydroxide generation process more efficient. In this method, magnesium salt solution and alkaline solution collide with each other under specific conditions, and a chemical reaction occurs rapidly to generate ultrafine magnesium hydroxide powder.
Process description
1. Reactant preparation: First, magnesium salt (such as magnesium sulfate MgSO₄) and alkaline substance (such as sodium hydroxide NaOH) are dissolved in deionized water to prepare solutions of appropriate concentrations.
2. Impingement flow formation: The two solutions are sprayed out through a high-speed pump or nozzle so that they collide with each other in the spraying area to form an impingement flow.
3. Precipitation generation: In the impingement flow area, the two solutions are rapidly mixed and react chemically to generate magnesium hydroxide precipitation.
4. Product collection: The generated ultrafine magnesium hydroxide powder is collected through steps such as filtration, washing and drying.
Technical advantages
1. High efficiency: The impingement flow reaction-precipitation method can significantly increase the reaction rate, shorten the reaction time and improve production efficiency.
2. Controllability: By adjusting parameters such as the spraying speed, nozzle distance and spraying angle, the morphology and size distribution of the product can be precisely controlled.
3. Energy saving and environmental protection: Compared with traditional methods, the impinging stream reaction-precipitation method consumes less energy and produces less waste, which is in line with the principles of green chemistry.
Application prospects
1. Flame retardant: The high-efficiency flame retardant properties of magnesium hydroxide ultrafine powder make it have broad application prospects in plastics, rubber, textiles and other fields.
2. Catalyst carrier: The special morphology and large specific surface area of magnesium hydroxide ultrafine powder make it an ideal catalyst carrier.
3. Environmentally friendly materials: In the field of environmental protection, magnesium hydroxide ultrafine powder can be used to adsorb heavy metal ions, remove pollutants in water bodies, etc.
4. Medical field: The biocompatibility and safety of magnesium hydroxide ultrafine powder make it have potential application value in the medical field.
The impinging stream reaction-precipitation method provides a new method for the preparation of magnesium hydroxide ultrafine powder that is efficient, controllable and environmentally friendly. This method not only improves production efficiency, but also achieves precise control of product morphology and size distribution by precisely controlling process parameters, laying a solid foundation for the widespread application of magnesium hydroxide.