PDADMAC Flocculant for Bauxite Red Mud Settling in Alumina Refining
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Product Overview
PDADMAC, also known as PolyDADMAC or Poly(dimethyl diallyl ammonium chloride), is a water-soluble cationic polymer widely used in mining, mineral processing, wastewater treatment, and sludge dewatering applications.
In alumina refining, the Bayer process generates a large amount of red mud slurry containing fine iron oxides, aluminum-containing minerals, silica, titanium compounds, and other suspended solids. Due to the extremely fine particle size and stable surface properties of red mud particles, natural settling is often slow, causing difficulties in thickener operation, overflow clarification, and residue management.
Bluwat PDADMAC Flocculant provides strong charge neutralization and adsorption performance. It destabilizes negatively charged red mud particles and promotes the formation of larger flocs, improving settling velocity, mud-water separation, and process water recovery.
Application in Alumina Refining and Red Mud Treatment
Red mud settling is one of the key separation steps in alumina production. Efficient flocculation helps improve production efficiency, reduce water consumption, and optimize residue handling.
PDADMAC can be applied in:
Bauxite red mud thickening
Alumina refinery clarification
Bayer process liquor clarification
Red mud settling tanks
Overflow water recovery
Alumina production wastewater treatment
Solid-liquid separation systems
Residue dewatering processes
Key Benefits
Effective Red Mud Particle Charge Neutralization
Red mud particles typically carry negative surface charges and remain suspended in alkaline slurry. PDADMAC provides strong cationic charge to neutralize these particles and improve settling performance.
Faster Red Mud Settling
PDADMAC promotes the formation of larger mineral flocs, allowing red mud solids to settle faster in clarification tanks and thickeners.
Improved Overflow Clarity
Better floc formation reduces suspended solids in overflow liquor, helping improve water recovery and process stability.
Enhanced Solid-Liquid Separation
PDADMAC improves the separation between red mud solids and liquid phase, supporting thickening and downstream dewatering operations.
Improved Water Recycling
By producing clearer overflow water, PDADMAC helps alumina plants recycle more process water and reduce freshwater consumption.
Suitable for High-Alkalinity Processes
PDADMAC can be applied in mineral processing systems with challenging water conditions and variable operating parameters.
Working Principle in Red Mud Settling
PDADMAC improves red mud settling through charge neutralization and polymer adsorption.
Treatment mechanism:
- Fine red mud particles with negative charges enter the treatment system.
- PDADMAC neutralizes particle surface charges.
- Destabilized particles aggregate into larger flocs.
- Flocs settle faster due to increased size and density.
- Clear liquor separates from concentrated red mud.
- Recovered water can be reused in alumina processing.
Typical Application Process
Bauxite digestion and Bayer process slurry
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Red mud separation tank
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PDADMAC dosing
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Rapid mixing for charge neutralization
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Slow mixing for floc growth
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Settling and clarification
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Clear overflow liquor recovery
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Red mud thickening or disposal
Product Specifications
Product Name: BLU DA Series PDADMAC Liquid
Chemical Name: Poly(dimethyl diallylammonium chloride)
Short Name: PDADMAC / PolyDADMAC
CAS Number: 26062-79-3
Appearance: Colorless to light yellow liquid
Solid Content: 20–50%
pH Value: 3.0–7.0
Specific Gravity at 25°C: 1.01–1.10
Charge Type: Cationic
Relative Molecular Weight:
Low molecular weight
Medium molecular weight
High molecular weight
Very high molecular weight
Brookfield Viscosity at 25°C:
Below 200 cps to above 15000 cps depending on grade
Package:
25L plastic drum
200L plastic drum
1000L IBC drum
Available PDADMAC Grades
DA 20% Series
DA 201
Low molecular weight, viscosity below 200 cps
DA 202
Medium molecular weight, viscosity 200–700 cps
DA 203
Medium molecular weight, viscosity 700–1000 cps
DA 204
High molecular weight, viscosity 1000–2000 cps
DA 205
Very high molecular weight, viscosity 2000–3000 cps
DA 40% Series
DA 401
Low molecular weight, viscosity below 500 cps
DA 402
Medium molecular weight, viscosity 500–1000 cps
DA 403
Medium molecular weight, viscosity 1000–3000 cps
DA 404
High molecular weight, viscosity 3000–5000 cps
DA 405
High molecular weight, viscosity 5000–8000 cps
DA 406
Very high molecular weight, viscosity 8000–12000 cps
DA 407
Very high molecular weight, viscosity 12000–15000 cps
DA 408
Very high molecular weight, viscosity above 15000 cps
DA 45% Series
DA 451
High molecular weight grade, viscosity 8000–12000 cps
DA 50% Series
DA 501
Low-medium molecular weight, viscosity 1000–2000 cps
DA 502
Medium molecular weight, viscosity 2000–3000 cps
DA 503
High molecular weight, viscosity 3000–5000 cps
DA 504
High molecular weight, viscosity 5000–8000 cps
DA 505
Very high molecular weight, viscosity 8000–12000 cps
DA 506
Very high molecular weight, viscosity 12000–15000 cps
DA 507
Very high molecular weight, viscosity above 15000 cps
Application Method
The optimum PDADMAC dosage for bauxite red mud settling depends on:
Red mud concentration
Particle size distribution
Alkalinity level
Solid content
Settler design
Required overflow quality
Before application, PDADMAC should be diluted according to the dosing system.
When used alone, it is recommended to dilute the product to 0.5–5% concentration based on solid content.
Jar testing and plant trials are recommended to determine the most suitable grade and dosage. Proper mixing conditions should be maintained to maximize floc formation and prevent floc breakage.
Product Selection Guidance
For fine red mud particles with slow settling characteristics, medium to high molecular weight PDADMAC grades may provide stronger floc formation.
For rapid charge neutralization and improved liquor clarification, lower viscosity grades may provide better dispersion.
For high-solids red mud thickening systems, higher molecular weight grades may improve floc strength and settling performance.
Final product selection should be confirmed through laboratory testing and actual plant conditions.
Packaging and Storage
Bluwat PDADMAC Liquid is available in:
25L plastic drums
200L plastic drums
1000L IBC drums
Store the product in original containers in a cool and dry place. Keep away from heat sources, flame, and direct sunlight. Refer to TDS, MSDS, and product label for detailed storage requirements.
Why Choose Bluwat PDADMAC?
Bluwat Chemicals is a professional manufacturer and exporter of water treatment chemicals, providing PolyDADMAC, PAM, PAC, Polyamine, and other specialty polymers for industrial wastewater and mineral processing applications.
Advantages:
Professional cationic polymer manufacturer
Stable product quality
Multiple molecular weight grades available
Suitable for alumina refining and mining applications
Technical support for application optimization
COA, TDS, and MSDS available
Global export experience
FAQ
Is PDADMAC suitable for bauxite red mud settling?
Yes. PDADMAC can be used in alumina refining processes to improve red mud settling, clarification, and solid-liquid separation.
How does PDADMAC improve alumina refinery clarification?
PDADMAC neutralizes negatively charged red mud particles and promotes larger floc formation, improving settling speed and overflow clarity.
Can PDADMAC work in alkaline red mud slurry?
Yes. PDADMAC is used in challenging industrial wastewater and mineral processing systems. Actual performance depends on process conditions and should be confirmed by testing.
Can PDADMAC be used together with PAM?
Yes. PDADMAC can provide charge neutralization while PAM can enhance floc growth through bridging. Combined use may improve treatment performance.
How should PDADMAC dosage be determined?
Dosage depends on red mud concentration, particle characteristics, alkalinity, and equipment conditions. Jar testing is recommended.