OLIVINE SAND

General Description

Crushed/ Screened Volcanic Rock Sand. Olivine, a finer sand may be used due to increased permeability, and thermal expansion is much lower than silica.

Appearance

Grey/Green Granular Material

Typical Chemical Analysis

MgO 49% Max.
SiO2 41% Max.
Fe2O3 12 % Max.
Al2O3 0.5 2.0% Max.
Cr2O3 0.25% Max.
CaO 0.2% Max.
L.O.I. 1.5

Size

0-1 mm, 1-4 mm

Application

Blast cleaning, foundry sand, refractories, welding electrodes, iron ore processing, abrasives, aggregates, roofing tiles, lasers, tundishes, ladle linings, electric arc furnaces, open hearth stoves, soaking pit bottoms, hot tops, forsterite bricks.

Vital Features

Melting Point (oC) 1,800
Specific Gravity (g/cm3) 3.2-3.4
Bulk Density, Loose (g/cm3) 1.45 1.75
Fusion Point (0C) 2800-3200
Thermal Expansion (in./in.) 0.0083
Loss On Ignition < 1.5%
Thermal Conductivity @ 1000oC (cal/s-cm oC) 0.0025
Mohs Hardness @ 20oC 7.0 (Scale 7-8000)
PH Slightly Basic
Free Silica Content (%) < 0.1

As a foundry aggregate, olivine is noted for its high fusion point, low uniform thermal expansion and its remarkable ability to resist fracture from thermal shock. Olivine has been famous for years in producing excellent non-ferrous castings. Today more foundry men are realizing that olivine works equally well in iron, manganese and stainless steel.

Grades
Foundry Grade