Zirconium silicate Property

Melting point:

2550 °C

Density 

4,56 g/cm³

refractive index 

1.78-1.99

solubility 

insoluble in H2O, acid solutions

form 

nanopowder

color 

Yellow to orange

Specific Gravity

4.56

Odor

Odorless

Water Solubility 

Insoluble in water, acids, alkali and aqua regia.

Hydrolytic Sensitivity

1: no significant reaction with aqueous systems

Crystal Structure

Zircon

crystal system

square

Merck 

14,10181

Space group

I41/amd

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.6607	0.6607	0.5982	90	90	90

Dielectric constant

5（0.0℃）

Exposure limits

ACGIH: TWA 5 mg/m3; STEL 10 mg/m3
NIOSH: IDLH 25 mg/m3; TWA 5 mg/m3; STEL 10 mg/m3

Stability:

Stable.

CAS DataBase Reference

10101-52-7(CAS DataBase Reference)

NIST Chemistry Reference

Zirconium silicate(10101-52-7)

EPA Substance Registry System

Silicic acid (H4SiO4), zirconium(4+) salt (1:1) (10101-52-7)

Safety

Hazard Codes 

Xn

Risk Statements 

20-36/37/38

Safety Statements 

26-36

WGK Germany 

3

TSCA 

Yes

HS Code 

28399090

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H332Harmful if inhaled

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Zirconium silicate Chemical Properties,Usage,Production

Description

Zircon (ZrSiO4) is an accessory nesosilicate mineral found in granites and, due to its high Mohs hardness of 7.5 and chemical inertness, it concentrates in the weathering products of mother igneous rocks such as in alluvial placer deposits and beach sands. Because of its chemical inertness and high melting point, zircon is wetted less easily by molten metal, producing smoother surfaces on iron, high alloy steel, aluminum, and bronze casting.

Chemical Properties

Zirconium silicate is a colorless tetragonal crystals (when pure); presence of impurities forms various colors; density 4.56 g/cm3; hardness 7.5 Mohs; dissociates to ZrO2 and SiO2 above 1,540°C; melts at 2,550°C; insoluble in water, acids, aqua regia, and alkalies; inert in most chemicals. Zirconium silicate is used as an additive to glass, in ceramic tiles, in ultrafiltration membranes, and as a dental abrasive.

Uses

Zirconium silicate (ZrSiO4) is one form of the mineral whose crystals when polished are known as cubic zircons, which resemble diamond gemstones.

Definition

Zirconium silicate is a naturally occurring silicateof zirconium, ZrSiO4, used as a gemstone.The colour depends in smallamounts of other metals and may bered, brown, yellow, or green. Redgem-quality zircon is sometimescalled jacinth; gem-quality zirconswith other colours are called jargoons.There is also a naturally occurringcolourless variety. Zircongems can be given other colours, ormade colourless, by heat treatment.The colourless varieties (either naturalor treated) are sometimes calledMatura diamonds (after Matura in SriLanka). The name 'zircon' is often erroneouslyapplied to a synthetic formof the oxide cubic zircona, which isused as a diamond substitute.

Preparation

Zirconium silicate occurs in nature as mineral zircon. Ore is mined from natural deposits and concentrated by various techniques (See Zirconium, Recovery). It is separated from sand by electrostatic and electromagnetic methods. Also, the compound can be made by fusion of SiO2 and ZrO2 in an arc furnace, or by reacting a zirconium salt with sodium silicate in aqueous solution.

Application

Zirconium silicate is used for manufacturing refractory materials for applications where resistance to corrosion by alkali materials is required. It is also used in production of some ceramics, enamels, and ceramic glazes. In enamels and glazes it serves as an opacifier. It can be also present in some cements. Another use of zirconium silicate is as beads for milling and grinding. Thin films of zirconium silicate and hafnium silicate produced by chemical vapor deposition. Potential alternative gate dielectric to silica. In Europe in cosmetic creams and powders.

Materials Uses

The largest use of zircon (Zirconium silicate) is as foundry sand, where zircon is used as the basic mold material, as facing material on mold cores, and in ram mixes. Zircon-sand molds have greater thermal shock resistance and better dimensional stability than quartz-sand molds. Zircon grains are usually bonded with sodium silicate.