Elementary

Chromium Cr Powder CAS 7440-47-3

Item No.: Tr-Cr
Chromium powder is a silvery-white metal with a slightly dark gray color (body-centered cubic crystal system).
Purity>99.95%
Particle size: 53-125um(FSSS)
INQUIRY
Description
Chromium Powder Properties

About Chromium Cr Powder:
Chromium is a steel-gray, lustrous, and hard metal that finds wide use as a catalyst or in alloys. Chromium is used as a hardener in steel, for the manufacture of stainless steel and many useful alloys. It is also employed to give glass an emerald green color. Chromium does not oxidize in the air, even in extreme moisture. What is chromium powder? Chromium powder is a silvery-white metal with a slightly dark gray color (body-centered cubic crystal system). Melting point (1857 soil 20)℃.The boiling point of 2672 ℃.
Relative density D28 7.20. Soluble in dilute sulfuric acid, dilute hydrochloric acid, insoluble in water, nitric acid, aqua regia. Chromium, the chemical symbol Cr, has an atomic number of 24 and belongs to the ⅥB group in the periodic table. The element name comes from the Greek word meaning "color," because chromium compounds have colors. The single material is steel-gray metal, which is the hardest metal in nature. The content of chromium in the earth's crust is 0.01%, ranking the 17th. Free natural chromium is extremely rare and mainly exists in chrome-lead ore. Metal chromium powder can burn under high temperatures and open flame. It has almost no harmful effect on the human body and has not been reported to cause industrial poisoning. But hexavalent chromium ions are carcinogenic. Packing and storage of products in iron drums lined with polyethylene plastic bags should be stored in dry and clean warehouses. Not to be stored and transported together with acids. Fire can be used dry powder, sand to extinguish. TRUNNANO is a trusted global Chromium Cr Powder supplement supplier. Feel free to send an inquiry about the latest price of Chromium powder at any time.

Product Information of chromium powder CAS 7440-47-3:

chromium powder Purity: 99.95% 
Copper powder Appearance: grey nanopowder
Copper powder FSSS: 53 to 125 microns
Copper powder Bulk density: 3.8 g/cm3
chromium powder COA:

(ppm)

Chemical Composition,ppm

Cr

≥99.95%

Si

8

C

15

K

6

O

130

As

0.5

Ca

3

Cd

8

Mg

0.2

Zr

0.5

Si

12

S

20

Al

15

Mn

6

Fe

160

Pb

0.5

Ni

20

W

15

Cu

13

N

19

 

How is Chromium Cr Powder produced?
In the production of chromium, the calcination process of chromite calcium is used to convert chromium trioxide into sodium chromate, which is leached into sodium chromate solution with dilute solution and water, and then manufactured by electrolysis method.
Electrolysis method: when sodium chromate is used as compensation solution for electrolysis, the cathode solution is 40g/L(Cr), 90g/L (NH4);Anodic solution is 22g/L (Cr), 18g/L (NH4), 200g/ LH2S04.Chromium metal was prepared by electrolysis of stainless steel for cathode and Pb-Ag alloy for anode at the temperature of about 60℃, cell voltage of 4.8V and current density of 8.6A/CrR12. Due to the high content of silicon, aluminum and other impurities in chromite and its additive, the amount of slag discharged in the process is large, because the slag contains toxic water-soluble Cr6+, which seriously pollutes the environment.
The process developed in recent years: the chromite is first reduced by carbon into carbon ferrochrome, and then oxidized by roasting and leaching with soda ash, dolomite and other mixtures to obtain sodium chromate solution, which is reduced by sulfur and calcined to obtain chromium oxide, and then smelted, sandblasted and finished with aluminum to obtain metal chromium products. The advantage of this method is that most of the impurities in chromite enter the smelting slag, so the total chromium in the mixture can be higher, and the pollution to the environment can be reduced, and the soda ash consumed in the roasting process is less, and the quality of the products can be improved at the same time.
 
Applications of Chromium Cr Powder:
Chromium powder uses are very wide. Chromium powder can be used as light-resistant, the heat-resistant coating also can be used as abrasives, glass, ceramic colorant, chemical synthesis of catalyst. Chromium alum and dichromate are used as tanning materials for leather, mordant, impregnating agent and various pigments for fabric dyeing. Chromium plating and chromizing can make steel, copper, aluminum and other metals form a corrosion-resistant surface, and bright and beautiful, widely used in furniture, automobile, construction and other industries. In addition, chrome ore is also used in large quantities to make refractory materials. Used for refining high-temperature alloy, resistance alloy, precision alloy as additive of chromium element. Pure chromium is used for electroplating.

Storage Condition of chromium Cr powder:
The damp reunion will affect chromium Cr powder dispersion performance and using effects, therefore, chromium Cr powder should be sealed in vacuum packing and stored in cool and dry room, the chromium Cr powder can not be exposure to air. In addition, the Cr powder should be avoided under stress.

Packing & Shipping of chromium Cr powder:
We have many different kinds of packing which depend on the chromium Cr powder quantity.
Chromium Cr powder packing:vacuum packing, 100g, 500g or 1kg/bag, 25kg/barrel, or as your request.
Chromium Cr powder shipping: could be shipped out by sea, by air, by express, as soon as possible once payment receipt.

Chromium Powder Properties

Other Names Chromium Chips, Chromium Sheet, Chromium Flake
CAS No. 7440-47-3
Compound Formula Cr
Molecular Weight 52
Appearance Silvery
Melting Point 1857
Boiling Point 2672
Density 7.18 g/cm3
Solubility in H2O N/A
Electrical Resistivity 12.96 microhm-cm @ 0 °C
Poisson's Ratio 0.21
Tensile Strength N/A
Thermal Conductivity 0.939 W/cm/K @ 298.2 K
Thermal Expansion (25 °C) 4.9 µm·m-1·K-1
Vickers Hardness 1060 MN m-2
Young's Modulus 279 Gpa
   
   

Chromium Powder Health & Safety Information

Signal Word Warning
Hazard Statements H400
Hazard Codes N/A
Risk Codes N/A
Safety Statements N/A
Transport Information N/A
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