Dolomite-Derived Magnesium Oxide via Controlled Hydration and Complexation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for preparing magnesium oxide from dolomite suffer from high energy consumption, high production costs, low purity, environmental pollution, and low recovery rates, making them unsuitable for industrial applications.
Innovation Solution
A process method involving the pretreatment of dolomite, controlled hydration, and the use of a complexing agent to separate calcium ions, resulting in a high-purity magnesium oxide with minimal impurities and no residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional magnesium ore carbonization method is used, then magnesium oxide can be prepared, but energy consumption is high, production cost is high, and purity is low
Solution Approach 1:
The invention changes the chemical parameters of the reaction system by using ammonium chloride solution instead of traditional carbonization methods. This parameter change enables the reaction to proceed at lower temperatures and pressures, reducing energy consumption while achieving high purity magnesium oxide through selective complexation of calcium ions
Solution Approach 2:
The invention introduces ammonium chloride as an intermediary substance that facilitates the selective dissolution and complexation process. The ammonium chloride acts as a mediator to separate magnesium and calcium components, enabling high purity magnesium oxide production without the high energy requirements of traditional methods
2Reliability
If ammonia method is used, then magnesium oxide can be prepared, but magnesium oxide forms colloid, process is difficult to control, resulting in local sintering, low activity, and low recovery rate
Solution Approach 1:
The invention changes the pH control parameters and temperature conditions to prevent colloid formation. By carefully controlling the addition rate of ammonium chloride and maintaining specific temperature ranges, the process avoids local sintering and ensures uniform reaction, improving both controllability and recovery rate
Solution Approach 2:
The invention performs preliminary complexation of calcium ions with ammonium chloride before the main magnesium oxide formation step. This preliminary action prevents calcium interference during the critical magnesium precipitation phase, ensuring better process control and higher recovery rates
3Object-affected harmful factors
If carbon ammonia method is used, then magnesium oxide can be prepared, but relatively large pollution and poor working environment occur
Solution Approach 1:
The invention converts the potentially harmful carbon-based process into a beneficial ammonium-based process. The ammonium chloride decomposes to release ammonia gas that can be captured and reused, transforming a pollution source into a recoverable resource, thereby reducing environmental impact while maintaining high product purity
4Ease of manufacture
If brine pyrolysis method is used, then magnesium oxide can be prepared, but high requirements for equipment and easy to cause greater pollution to the environment, low recovery rate of raw materials
Solution Approach 1:
The invention replaces expensive, complex pyrolysis equipment with simple, readily available glassware and basic heating apparatus. The process uses inexpensive ammonium chloride solution that can be easily prepared and disposed of or regenerated, eliminating the need for specialized high-temperature pyrolysis equipment while achieving high recovery rates
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves a short preparation process, low energy consumption, and low costs while ensuring high purity and no residues, addressing the limitations of traditional methods.
Implementation Method 1
with the addition of complexing agent, calcium ions are complexed to obtain magnesium oxide and a small amount of impurities
Implementation Method 2
configuring a complex solution, using a sodium hydroxide solution to adjust a pH value to 8-10
Implementation Method 3
hydrating the calcined dolomite according to a solid-liquid ratio, controlling a hydration temperature and a hydration time
Data Source
AI summary
A process method for preparing magnesium oxide from dolomite includes the following steps: S1, pretreating dolomite to obtain the calcined dolomite; S2, hydrating the calcined dolomite according to the solid-liquid ratio, controlling the hydration temperature and the hydration time, filtering, washing and drying after hydration to obtain the hydration product; S3, configuring a complex solution, using the sodium hydroxide solution to adjust the pH value to 8-10; S4, performing the complexation reaction by mixing the hydration product in S2 with the complex solution in S3, and controlling the complexation temperature and the complexation time, obtaining the magnesium oxide by filtration, washing and drying after the reaction is completed. The invention uses dolomite as raw material, and the amount of magnesium hydroxide produced by magnesium oxide at a specific hydration temperature and hydration time can be ignored.