Vertical Three-Zone Reactor for KCl-NaCl Separation
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Solution Overview
Problem
Current methods for separating potassium chloride and sodium chloride from sylvinite ore are inefficient, resulting in incomplete extraction and contamination of halite waste with foreign substances, leading to high energy consumption and significant waste production.
Innovation Solution
A method involving a vertical three-zone reactor where a pre-ground polymineral source is fed into the upper zone with a sodium chloride and potassium chloride saturated solution, allowing recrystallization of sodium chloride dihydrate, followed by multistage sizing and countercurrent washing, and subsequent recrystallization into anhydrous sodium chloride, achieving complete dissolution and separation of potassium chloride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the halurgic method is used for separating potassium chloride from sylvinite ore, then the purity of potassium chloride is improved (up to 98%), but the extraction completeness deteriorates (only 86-88% extracted, 2-3% remains in halite waste)
Solution Approach 1:
The separation process is divided into multiple sequential zones within a single reactor: (1) dissolution zone where ore is contacted with saturated solution, (2) flotation zone where air bubbles separate KCl from halite, and (3) washing zone where countercurrent flow removes residual salts. This segmentation allows each zone to optimize for its specific function, achieving both high extraction and high purity.
Solution Approach 2:
The patent combines three separate operations (dissolution, flotation, and washing) into a single integrated reactor system. The saturated solution serves multiple purposes: as a dissolution medium, as a flotation liquid phase, and as a washing agent in countercurrent flow. This merging eliminates intermediate transfer steps and improves overall process efficiency.
2Manufacturing precision
If the halurgic method is used for separating potassium chloride from sylvinite ore, then the purity of potassium chloride is improved (up to 98%), but the energy consumption deteriorates (high energy consumption for heating and cooling)
Solution Approach 1:
The reactor operates continuously with constant circulation of saturated solution through all zones. The solution is repeatedly used for dissolution, flotation, and washing without being discarded or requiring re-heating/cooling cycles. This continuous action eliminates the thermal cycling energy penalties of batch processes.
Solution Approach 2:
The saturated solution serves multiple functions throughout the process: it dissolves KCl from ore, acts as the liquid phase for flotation, and provides washing fluid in countercurrent flow. The system uses its own circulating solution rather than requiring external heating/cooling inputs for each stage.
3Manufacturing precision
If the halurgic method is used for separating potassium chloride from sylvinite ore, then the purity of potassium chloride is improved, but the contamination of halite waste deteriorates (high level of contamination with foreign substances)
Solution Approach 1:
The flotation process selectively extracts potassium chloride from the ore matrix by attaching it to air bubbles, leaving halite and other dense impurities behind. The countercurrent washing then extracts residual soluble salts from the halite waste using upward flowing saturated solution, producing cleaner halite suitable for commercialization.
Solution Approach 2:
Air bubbles serve as an intermediary carrier that selectively transports potassium chloride particles from the ore suspension to the froth phase. The bubbles mediate the separation by adhering to hydrophobic KCl surfaces while leaving hydrophilic halite particles in the liquid phase.
4Productivity
If the flotation method is used for separating KCl and NaCl from ore, then the productivity is improved (predominant method currently), but the manufacturing precision deteriorates (lower content of potassium chloride in concentrate, no more than 95%)
Solution Approach 1:
The patent replaces conventional mechanical flotation with a hybrid system where dissolution chemistry precedes flotation. By pre-dissolving KCl in saturated solution before flotation, the process enhances the selectivity and purity of the flotation step, achieving over 98% KCl content in concentrate.
5Device complexity
If conventional separation methods are used, then the process complexity is kept simple, but the loss of substance deteriorates (incomplete extraction, significant waste production)
Solution Approach 1:
The patent merges dissolution, flotation, and washing operations into a single reactor with integrated zones. This consolidation achieves near-complete extraction (over 98%) by ensuring thorough contact between ore and saturated solution, complete separation via flotation, and effective washing of residual salts, all within one continuous process flow.
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
This method achieves over 98% separation of potassium chloride with purity exceeding 98% and over 99% separation of sodium chloride with purity above 99.9%, significantly reducing waste production by eliminating encapsulation of impurities and minimizing contamination.
Implementation Method 1
recrystallizing sodium chloride to form sodium chloride dihydrate
Implementation Method 2
the temperature in the upper zone is maintained between −2.5° C. and −20° C.
Implementation Method 3
separating the resulting sodium chloride dihydrate crystals from crystals of potassium chloride by flotation to produce a froth containing potassium chloride crystals
Implementation Method 4
multistage countercurrent washing of the falling sodium chloride dihydrate crystals by the same upward flow of liquid phase
Implementation Method 5
recrystallizing the washed sodium chloride dihydrate crystals into anhydrous sodium chloride in the lower zone
Implementation Method 6
the temperature in the lower zone is maintained between 0.5° C. and 15° C.
Data Source
AI summary
The present invention relates to sylvinite ore processing in the extraction industry and provides a resource-efficient method of separating potassium chloride and sodium chloride from polymineral sources comprising potassium chloride and sodium chloride and a vertical three-zone reactor for separating potassium chloride and sodium chloride from polymineral sources comprising potassium chloride and sodium chloride.