Dolomite Treatment System for Calcium-Magnesium Separation
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Solution Overview
Problem
The dolomite carbonization method faces challenges in complete separation of calcium from magnesium, leading to low-purity products, high energy consumption, and resource waste due to incomplete separation and impurity introduction from calcination processes.
Innovation Solution
A comprehensive treatment system incorporating a primary calcination device for indirect dolomite calcination, a carbon dioxide capture system, a carbonization separation device, a pyrolysis device, and a secondary calcination device, along with the use of inhibitors and dispersants, to enhance separation efficiency and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct calcination with coke and fuel gas is used, then calcination efficiency is improved, but sulfur and metal ion impurities are introduced affecting product quality
Solution Approach 1:
The patent introduces a purification system with demister and electrostatic precipitator as intermediary devices between the calcination furnace and carbonization tower. These intermediaries remove sulfur and metal ion impurities from the flue gas, preventing contamination of the calcium magnesium carbonate products while maintaining high calcination efficiency.
Solution Approach 2:
The patent extracts and removes harmful impurities (sulfur and metal ions) from the flue gas stream through purification equipment before the gas is reused in the carbonization process. This separation ensures that only clean gas contacts the calcium magnesium carbonate suspension, protecting product quality.
2Manufacturing precision
If multiple times of calcination and purification are performed, then product performance is improved, but resource waste and energy consumption increase
Solution Approach 1:
The patent implements a continuous single-stage carbonization process where purified flue gas continuously carbonates the calcium magnesium carbonate suspension in one pass, achieving high-performance products without multiple discrete calcination and purification cycles, thereby reducing energy consumption.
Solution Approach 2:
The patent recovers and reuses the flue gas from calcination after purification, converting it into a useful carbonation resource for the carbonization tower. This eliminates waste and reduces the need for additional energy-intensive purification steps.
3Productivity
If carbon dioxide is introduced into digestion emulsion, then calcium carbonate precipitation is generated, but incomplete separation of calcium from magnesium occurs
Solution Approach 1:
The patent performs preliminary purification of the flue gas by removing sulfur and metal ion impurities before introducing it into the carbonization tower. This preliminary cleaning prevents impurity-related incomplete separation and enables effective calcium-magnesium separation in a single carbonization stage.
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 system achieves high-purity light calcium carbonate and magnesium oxide production, reduces energy consumption, and recycles carbon dioxide, thereby improving resource utilization and reducing impurity introduction.
Implementation Method 1
after carbon dioxide is introduced, performing firstly the precipitation reaction of calcium hydroxide in the digestion solution to generate calcium carbonate
Implementation Method 2
pyrolyzing the above filtrate (heavy magnesium water) to obtain basic magnesium carbonate precipitation
Implementation Method 3
calcining the basic magnesium carbonate precipitation to obtain magnesium oxide
Data Source
AI summary
The invention provides a complete set of treatment system and method for deep utilization of dolomite resources. The system includes a primary calcination device, a carbon dioxide capture device, a digestion device, a carbonization separation device, a pyrolysis device and a secondary calcination device; the primary calcination device includes a dolomite calciner, a plurality of hoardings and an exhaust pipe, and an exhaust chamber is formed between the hoardings, the top of the dolomite calciner and the outer wall of the blanking bin; the exhaust chamber is in communication with the carbon dioxide capture device through the exhaust pipe; the carbonization separation device includes a carbonization reaction tank whose gas inlet is in communication with the gas outlet of the carbon dioxide capture device; and the pyrolysis device includes a pyrolysis kettle and a vacuum pump which maintains a negative pressure state in the pyrolysis kettle.