Chinaclay / Kaolin

Kaolin also called China clay (Kaolin) is a naturally occurring whitish & soft clay substance that have developed from the chemical weathering of granite, an igneous feldspar rocks in hot, moist climates. China clay (Kaolin) is hydrated aluminum silicate having Al2O32SiO22H2O chemical formula.

Kaolin was first discovered in the mountainous province of Kiangsi, China in A.D. 500. The word “kaolin” derives from Chinese character ‘kao lin’ which means high ridge. It was first used by the Chinese to make high quality porcelain.

Washed or levigated China clay (Kaolin) is produce by levigation process. Raw China clay (Kaolin) is mixed with water to create milk shake like slurry. This slurry is passed through de-gritting, solid-liquid separation, Filtering & drying process & then it became water washed Chin clay (Kaolin).

At HRD, we manufacture different types of washed China clay (Kaolin) grades which are available in powder, granules cum powder & lumps form. These grades are used for different applications.

Raw Kaolin Clay

Kaolin is a clay mineral, part of the industrial cluster of minerals, with the chemical composition Al2Si2O5 (OH) 4. It is a formed as silicate mineral, with one tetrahedral sheet of silica (SiO4) linked through oxygen atoms to one octahedral sheet of alumina (AlO6) octahedra. Rocks that are rich in kaolinite are known as kaolin.

We have the capacity of supplying 100000 MT Raw Kaolin in a month. The raw kaolin is used in many industries as an important raw material. It is naturally mined from the Mines of Kaolin.

We would like to take an Opportunity to say that we are one of the prominent manufacturer and exporter. We have our esteemed overseas client with their consumption of more than 20k MT. which help us to grow faster in the international Market.

Levigated China clay

We usually process raw kaolin by high tech washing system to have Pure grade of china clay and removed impurities from the kaolin, this process is also called as levigation process. This levigation process helps to have common kaolin grade with balanced and better physical and chemical properties after removing impurities like silica, iron, titanium, etc. which make our product Pure and accurate

Hydrous Kaolin

Hydrous kaolin is characterized by its fine particle size, high brightness and rheology. We developed fine and ultra-fine grades of Hydrous Kaolin’s from our best reserves for different industries including Paint, Paper, Printing Inks, Paper Board, Rubber, etc.

Calcined Kaolin

Calcined Kaolin is an anhydrous aluminum silicate produced by heating ultrafine natural kaolin to high temperatures in a kiln. The calcination process increases whiteness and hardness, improves electrical properties, and alters the size and shape of the kaolin particles.

Refractory Clay

Fire clay is a range of refractory clays used in the manufacture of ceramics, especially fire brick. The United States Environmental Protection Agency defines fire clay very generally as a “mineral aggregate composed of hydrous silicates of aluminum (Al2O3·2SiO2·2H2O) with or without free silica.”

Grade Information

Recent Test Report

SUPER V1

VRD.V6 & HRD.3 MIX

Grade Report

Parameters	SM - 97 (%)	SM - 95 (%)	SM - 94 (%)	SM - 92 (%)	SM - 90 (%)	SM (%)
Loss on Ignition	13.7	14.82	14.23	13.2	13.19	9.78
Silica as SiO₂	47.7	47.57	48.75	45.9	46.4	60.84
lron as Fe₂O₃	0.18	0.22	0.35	0.4	0.45	0.7
Alumina as AI₂O₃	36.99	36.48	35.68	35.1	35.2	26.03
Potash as K₂O	0.08	0.035	0.09	0.067	0.083	0.39
Soda as Na₂O	0.021	0.051	0.021	0.0396	0.1	0.25
Titanium as TiO₂	0.48	0.6	0.75	0.8	0.9	1.12
Firing Whiteness	92	90.5	90.1	89.9	81.6	78.1
L-Value	97.12	95.33	94.14	92.4	90.8	90.8
A-Value	0.21	0.46	0.26	0.65	0.72	1.3
B-Value	2.92	3.38	2.72	3.9	4.8	8.2
Firing Colour	White	White	white	White	White	Creamish
Shrinkage	4.76	5.8	5.46	5.2	7.56	4.6
Fired Temperature °C	1220	1220	1220	1220	1220	1220
Water Of Plasticity	33.9	35	35.8	41	46	14.52
Water Absorption	20.77	18.21	21.3	19.24	17.09	14.52
Dry M.O.R Kg/cm 2	28.4	27.2	14.23	15	10	32.6
Fired M.O.R Kg/cm 2	85	75	68.23	70	82.2	152.2