Damping Pulsating Flotation Column for Coal Slime Separation
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Solution Overview
Problem
Existing coal slime separation equipment faces challenges with high ash content and low recovery rates due to 'static' separation environments and 'strong turbulent flow' conditions, leading to increased ash content in clean coal and reduced selectivity and recovery efficiency.
Innovation Solution
The introduction of a damping pulsating separation technology in a flotation column system, including a feeding system, mineralization system, and pulsating water flow control system, which utilizes a stirring barrel, bubble generator, mineralization chamber, turbulent-flow dissipation pipe, and microporous ceramic plates to enhance turbulence, collision probability, and pulsating water flow for improved separation and recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If column separation equipment with static separation environment is used, then separation selectivity is improved, but recovery rate of coal slime decreases
Solution Approach 1:
The invention transforms the static separation environment of traditional column equipment into a dynamic pulsating separation environment by introducing periodic pulsating flows. The pulsating water flow creates alternating high-velocity and low-velocity phases that enhance particle-bubble collision probability while maintaining separation selectivity, thereby resolving the contradiction between selectivity and recovery rate.
Solution Approach 2:
The invention employs periodic pulsating water flow to create cyclic variations in flow velocity and turbulence intensity. During the high-velocity phase, particle-bubble collision is enhanced for better recovery; during the low-velocity phase, separation selectivity is maintained. This periodic action allows the system to achieve both high recovery rate and high selectivity simultaneously.
2Productivity
If groove type separation equipment with strong turbulent flow is used, then recovery rate of coarse particles is improved, but ash content of clean coal increases
Solution Approach 1:
The invention replaces the continuously strong turbulent flow of groove type equipment with a dynamic pulsating flow that alternates between high-velocity and low-velocity phases. The periodic nature of the pulsating flow provides sufficient turbulence for particle-bubble collision during high-velocity phases while allowing settling and separation during low-velocity phases, thereby reducing mechanical inclusion and ash content.
Solution Approach 2:
The pulsating water flow creates periodic cycles of intense mixing and gentle settling. During the pulsating high-velocity phase, coarse particles effectively collide with bubbles for high recovery; during the subsequent low-velocity phase, the foam layer stabilizes and allows selective separation, preventing excessive ash content in the clean coal product.
3Productivity
If pulsating water flow frequency and amplitude are increased, then separation efficiency is improved, but energy consumption increases
Solution Approach 1:
The invention uses periodic pulsating water flow with optimized frequency and amplitude parameters. The pulsating flow creates efficient particle-bubble interaction during high-velocity phases while allowing natural settling during low-velocity phases, achieving high separation efficiency without requiring continuously high energy input. The periodic nature allows energy recovery during the deceleration phase.
Solution Approach 2:
The invention optimizes the pulsating water flow parameters (frequency and amplitude) to achieve the most efficient separation with minimum energy consumption. By carefully selecting the pulsating frequency to match the natural settling characteristics of the particles and the bubble rise velocity, the system achieves high separation efficiency while minimizing the energy required to drive the pulsating 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 approach improves the recovery and selectivity of coal slime by reducing ash content, increasing the yield of clean coal, and enhancing separation efficiency while maintaining operational stability and adaptability to varying coal qualities.
Implementation Method 1
a bubble generator (7), a mineralization chamber (10) and a turbulent-flow dissipation pipe (12), wherein an inlet of the bubble generator (7) is connected to an outlet pipeline of the pump (6), and an outlet of the bubble generator (7) is connected to a feeding port below the mineralization chamber (10)
Implementation Method 2
The introduction of a damping pulsating separation technology in a flotation column system, including a feeding system, mineralization system, and pulsating water flow control system, which utilizes a stirring barrel, bubble generator, mineralization chamber, turbulent-flow dissipation pipe, and microporous ceramic plates to enhance turbulence, collision probability, and pulsating water flow for improved separation and recovery
Implementation Method 3
one or more layers of microporous ceramic plates are arranged between the top of the inflation chamber and the air flotation scavenging region
Implementation Method 4
damping pulsating water flow type flotation column... an active pulse flow region includes an annular pulsating water flow pipe surrounding the damping pulsating water flow type flotation column, the annular pulsating water flow pipe is provided with a plurality of jet orifices to enable clean water to uniformly wash a foam layer in the separation process
Implementation Method 5
the foam layer has a certain effect of filtering out fine slime entrained in the clean coal along with water flow to form inclusions
Implementation Method 6
the clean coal foam layer is thin (200 mm to 300 mm), there is no foam concentration process, the ash content of the clean coal is usually high
Data Source
AI summary
Disclosed is high-ash fine coal slime separation equipment and method, applicable to the field of coal washing. The high-ash fine coal slime separation equipment includes a feeding system (1), a mineralization system (2), a separation system (3) and a pulsating water flow control system (4). A coal slime mineralization region is isolated from a separation region; and a damping block and a pulsating water flow device are arranged in a mineral separation system. A flotation feeding is fed into the feeding system (1), slurry mixing operation is completed, coal slime enters the mineralization system after pulp mixing to generate turbulent collision to form mineralized bubbles, the mineralized bubbles enters the separation system (3) after passing through a turbulent-flow dissipation pipe (12), and meanwhile, pulsating water flow with a certain frequency and waveform is fed into the separation system (3) by the pulsating water flow control system (4).