Preparation of magnesium hydroxide from nitric acid hydrolysis of phosphate tailings: resource recovery and process optimization
The technology of preparing magnesium hydroxide by acidolysis of phosphorus tailings with nitric acid provides an efficient way for the recycling of magnesium resources. As a multi-purpose industrial raw material, magnesium hydroxide is widely used in many fields.
Process overview
Nitric acid acidolysis: Using nitric acid as a solvent to extract magnesium from phosphate tailings.
Purification treatment: remove impurities through iron removal and other steps to improve product purity.
Precipitation formation: Use an alkaline precipitant to convert magnesium ions into magnesium hydroxide and precipitate.
Aging process: Improve the crystallinity and purity of magnesium hydroxide.
Post-processing: including filtration, washing, drying and other steps to obtain the final product.
Process condition research
Precipitant selection: affects the purity and morphology of magnesium hydroxide.
Dropping speed: affects the particle size of the precipitate.
Precipitation temperature: significantly affects the morphology and crystallinity of magnesium hydroxide.
Aging time: Improve the crystallinity of magnesium hydroxide.
Experimental conditions
Nitric acid concentration: affects magnesium ion extraction efficiency.
Liquid-to-solid ratio: affects extraction efficiency.
Temperature: affects reaction rate and product quality.
pH value: controls the magnesium hydroxide precipitation process.
key parameter
Optimum acid leaching conditions: Determine optimal temperature, pH and time.
Precipitant selection: Study the impact of different precipitants on product properties.
Drop rate: Study the effect on magnesium hydroxide particle size.
Precipitation temperature: study the effect on crystallinity.
Aging time: Study the effect on crystallinity.
experimental method
Experimental design: An orthogonal experimental design was used to determine the optimal process conditions.
Data analysis: Use statistical analysis software to evaluate the impact of various factors on product quality.
Results and discussion
Product characteristics: Evaluate the purity, morphology, and crystallinity of magnesium hydroxide.
Economic evaluation: Consider raw material costs, energy consumption, etc.
Environmental Impact: Evaluate the environmental friendliness of the process and waste disposal options.
Research on the preparation of magnesium hydroxide from nitric acid acidolysis of phosphorus tailings will help determine the optimal process conditions, improve product quality and yield, while reducing costs and environmental impact, and promote the development of sustainable resource recovery technology.