China Clay Plant Chemicals

Product Overview

China clay (kaolin) beneficiation involves a series of physical and chemical processing steps including blunging, degritting, fractionation, bleaching, and dewatering. At each stage, carefully selected chemicals are required to control slurry rheology, achieve particle separation targets, and produce finished clay with the required brightness, particle size distribution, and surface properties.

Cleanex Chemicals supplies a full range of processing chemicals tailored specifically for china clay plants: high-performance polyacrylate dispersants for deflocculation, bleaching chemicals for iron removal and brightness improvement, selective flocculants for fractionation, and dewatering aids for filter press and centrifuge operations. Our products are validated for high-solids kaolin slurries (55–70% w/w) typical of Gujarati and Indian china clay operations.

Product Types & Variants

Key Features & Benefits

• Controls kaolin slurry viscosity at high solid content (55–70% w/w)
• Improves brightness and whiteness of finished clay product
• Reduces water consumption in processing through higher solids operation
• Enables efficient particle size fractionation and classification
• Effective iron removal via reductive bleaching for high-brightness products
• Improves filter press cake formation and reduces moisture content
• Compatible with all standard china clay processing equipment
• Formulated for the specific mineralogy of Indian china clay deposits

Process Stage Applications

Process Stage	Chemical Used	Function
Blunging & Dispersion	Sodium polyacrylate dispersant	Deflocculation, viscosity reduction, high-solids processing
Degritting	Dispersant + pH adjustment (NaOH)	Maintaining slurry stability during coarse particle removal
Fractionation / Classification	Selective anionic flocculant	Selective settling of coarse clay fraction
Bleaching	Sodium dithionite + conditioning chemical	Iron (Fe³⁺) reduction to Fe²⁺, brightness improvement
Filter Cake Washing	Dispersant	Re-dispersion of cake for efficient washing
Dewatering (Filter Press)	Cationic flocculant	Improved cake formation, lower moisture content
Wastewater Recovery	Cationic flocculant + PAC	Recovery of fine clay particles from process water

Technical Specifications

Parameter	Value / Range
Working pH range	7.0 – 9.5 (dispersant optimum pH 7.5–8.5)
Effective slurry solids	55 – 70% by weight
Typical dispersant dosage	0.1 – 0.5% on dry clay weight
Processing temperature range	15 – 70°C
Bleaching chemical (Na₂S₂O₄) dosage	1 – 5 kg per tonne of dry clay
Brightness improvement (bleaching)	3 – 8% ISO brightness units (deposit-dependent)
Dispersant appearance	Colourless to pale yellow liquid
Packaging	20 L, 50 L, 200 L drums; 25 kg bags (dry products)