Indirect ZnO powder

Indirect ZnO powder physical properties Appearance: Indirect zinc oxide powder is a kind of metal oxide, it is white hexagonal crystal or powder at room temperature, odorless, tasteless, sandless, and the particle size is about 0.1-10 microns. Boiling point (℃): 2360 Melting point (℃): 1975 Flash point ℃ : 1436 Density g/cm3: 5.606 Refractive index: nD20 2.008~2.029 Solubility: insoluble in water, the solubility of 29 C in water is 1.6 mg/L. It is soluble in acid and strong alkali, ammonia water and ammonium salt solution. Stability: stable Indirect ZnO powder chemical properties Molecular formula: ZnO CAS Number: 1314-13-2 EINECS Number: 215-222-5 Relative molecular mass: 81.3894 (according to 2010 international relative atomic mass)

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Indirect ZnO powder

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Indirect ZnO powder physical properties

Appearance: Indirect zinc oxide powder is a kind of metal oxide,

it is white hexagonal crystal or powder at room temperature, odorless, tasteless, sandless, and the particle size is about 0.1-10 microns.

Boiling point (℃): 2360

Melting point (℃):1975

Flash point℃ : 1436

Density g/cm3: 5.606

Refractive index: nD20 2.008~2.029

Solubility: insoluble in water, the solubility of 29 C in water is 1.6 mg/L. It is soluble in acid and strong alkali, ammonia water and ammonium salt solution.

Stability: stable

Indirect ZnO powder chemical properties

Molecular formula: ZnO

CAS Number: 1314-13-2

EINECSNumber: 215-222-5

Relative molecular mass:

81.3894 (according to 2010 international relative atomic mass)

The differencebetween Indirect Zno Powder and the directZnO powder

There are directZnO powder and indirectZnO powderfor the production of zinc oxide. The difference between indirectZnO powder and directZnO powder is that their manufacturing materials and processes are different, so the fields of application are also different.

1. DirectZno powder

DirectZnO powdermostly uses zinc ore, zinc ash, and zinc concentrate as raw materials, which are oxidized and roasted at high temperature and then reduced to zinc vapor by adding coal.

The zinc vapor is oxidized with hot air to obtain Direct ZnO powder. The product purity of this process is low, generally between 75% and 95%, with high or low impurity content.

2. Indirect ZnO powder

The raw material of indirectZnO powder is metal zinc ingots or zinc slag obtained by smelting. It is a white hexagonal crystal or powder at room temperature with a particle size of about 0.1-10 microns. Hardly soluble in water, soluble in acid and strong alkali, ammonia and ammonium salt solution. It is odorless, tasteless and sandless. It turns yellow when heated, and turns white again after cooling, and sublimates when heated to 1800°C.

Standard:《GB/T3185-2016》
Item	Type1	Type2	Type3
Zinc oxide（Zn0 calculating as dry materia)% ≥	99.7	99.7	99.5
Metal content（as Zn)% ≤	none	none	0.008
Insoluble Matter in Hci % ≤	0.006	0.008	0.03
Loss on ignition % ≤	0.2	0.2	0.25
Residue on sieve (45um)% ≤	0.1	0.15	0.2
Water soluble matter % ≤	0.1	0.1	0.15
Volatile matter in 105℃ % ≤	0.3	0.4	0.5
Lead(pb）% ≤	0.008	0.05	0.1
Copper(Cu)% ≤	0.0002	0.0004	0.0007
Manganese（ Mn）%	0.0001	0.0001	0.0003
Cadmium (Cd）%	0.002	0.005	0.01
Iron (Fe）%	0.005	0.01	—