Zeolites are a family of crystalline alumosilicate minerals with a three-dimensional cage-like structure consisting of SiO4 and AlO4 tetrahedra joined by shared oxygen atoms. The negative charges of the AlO4 units are balanced by the presence of exchangeable cations which can be readily displaced by other substances, particularly ammonium and metal ions. This process is widely known as “cation exchange capacity” (CEC). Zeolite has a high CEC, which makes it such a popular product in a variety of industries where cation exchange is important. Besides, zeolite is a highly sorbent substance – a property important in a number of applications.
Turfcare – benefits of using zeolite
- Improves nutrient and fertiliser availability to plants
- Granules absorb soluble nitrogen and potassium, thus reducing leaching of key nutrients
- Addition of granules to soil increases air availability to plants
- Improves germination rates
- Helps protect against fertiliser damage to plants
- Prevents soil compaction.
Manufacture of slow release fertilisers
Zeolite is used in the manufacture of slow release fertilizers, helping to prevent the leaching of excess nutrients into watercourses, thus reducing problems such as nitrogen pollution and eutrophication. It also makes the use of fertilisers economical, reducing the amount added to soil.
Land can become contaminated with heavy metals and other toxic substances for a whole number of reasons. Traditional methods of remediation have included soil washing and soil removal, which are both expensive and disruptive to the environment. An alternative approach is to create soil conditions which immobilise contaminants whilst providing the nutrients and water holding capacity necessary for plant growth. Due to its ability to adsorb heavy metals, zeolite plays an important part in the remediation of affected areas.
Waste Water Treatment
Zeolite is used to remove ammonia and heavy metals from waste water.
Clinoptilolite, a natural zeolite, with approximate empirical formula:
(Ca, Fe, K, Mg, Na)3-6Si30Al6O72.24H2O
Mineralogical Analysis (Typical data)
Other Zeolite 0-5%
Chemical Composition (Typical data)
SiO2 65-72% As < 30 ppm
Al2O3 10-12% Cd < 0.6 ppm
CaO 2.4-3.7% Pb < 60 ppm
K2O 2.3-3.8% Hg < 0.1ppm
Physical Properties (Typical data)
Bulk Density: 0.60 – 0.70 MT/m3
Cation Exchange Capacity: 1.5 – 1.9meq/g
Micropore Area: 11m2/g
Mesopore Area: 29m2/g
pH: 7.0 – 9.0
We sell zeolite clinoptilolite in a wide range of sizes to suit almost every application: <40 microns, <300 microns, 300-700 microns, 0.7-1.6mm, 1.6-3mm, 3-5mm, 5-9mm and 9-16mm. Other sizes are available by special order. It comes in 25kg bags, and some sizes are available in 1MT bags.
Please enquire for more details or place an order here.