Processes

With a commitment to innovation and a dedication to quality, Hugh King & Co tailors its sands to meet its clients’ needs. To do this, raw materials are passed through a number of processes to root out impurities and create self-draining, clay-free sands.

Rock-to-sand
While Hugh King & Co’s brown sand occurs naturally and, as such, is stored in large dunes, its white counterpart is found in rocks which must be broken down through a process of attrition scrubbing. This occurs in a large aerofall mill containing a series of rotating metal balls which break down the rock to create sand.

 Washing sand
Hugh King & Co’s sands are subjected to intense washing that removes undesirable elements such as wood, coal, stones and clay. The sand is passed over a screen, which is essentially a large sieve, while being sprayed with water. Suitable materials pass through the mesh while silty deposits are washed away.

Dual feed
Uniquely, Hugh King & Co has developed a system where two feeder hoppers can be employed simultaneously to create a truly integrated mix of white and brown sand when required.

Separated by density
Various grades of sand are separated in large water tanks, known as upward current classifiers, which process 100,000 litres of water and sand every hour. Suspended in solution, the sand is segregated into fine, medium and coarse grades according to particle weight.

Drying sand
Moist sand contains about 5% water. To create a dried product, sand is passed over a fluid bed drier and heated to about 300°C. After the water has been evaporated, the sand is passed over a screen to ensure the particle size is within specification.