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Zinc powder used specially for gold and silver


Sample Nature:
Molecular formula: Zn
Molecular weight: 65.38
Physical property: Dark gray metal fine powder.
Density:7.14g/cm³, Melting point: 419.58℃,
Boiling point: 907℃.

Chemical Properties:
It does not dissolve in water. It dissolves in acid and base. It dissolves in acetic acid and ammonia water slowly. It has strong reducibility. When it reacts with acid and base, hydrogen will be produced. It agglomerates under humid condition. It is stable in dry air. White basic carbonate is produced in humid air and it covers on the surface. When it is burnt in air, blue flame is produced. Besides, zinc oxide is generated. The product with high purity reacts with sulfuric acid,nitric acid and hydrochloric acid slowly. When it contains a little other metal such as iron, tin and lead, the reaction will accelerate.

Product Characteristics:
Huiyuan zinc powder used specially for gold and silver has characteristics such as high metal zinc content, low content of other impurity elements, smooth particle surface and large specific surface area, low loose-packed powder density, less surface oxidation and less melting deformation and grape-like particles through adhesion. Total zinc content is more than 98.5%. Metal zinc content is more than 96%.

Product Use:
It is used for solution purification and metallic replacement, for instance, extracting gold, silver and nonferrous metals.

Technical Index:


Zinc Powder national standards GB/T6890-2000

Chemical composition(%)

Super ior product

The main no less than

Impurities no more than

Zinc only

Metal zinc

Pb

Fe

Cd

Acid-insoluble substance

First class

98

96

0.1

0.05

0.1

0.2

Second class

98

94

0.2

0.2

0.2

0.2

Third class

96

92

0.3

 

 

0.2

Fouth class

92

88

 

 

 

0.2

Note:The fouth class zinc powder produced by materials contained zinc,the content of sulphur should less than 0.5%.

 

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