Chemical composition

Unit

Specifications

Special characteristics

Detection method

Main instruments

Fe

%

31.0±0.2

▽

Potassium dichromate volumetric method

Burette

Na+K

%

≤0.015

ICP

ICAP PRO

Cu+Zn+Ni+Cr

%

≤0.012

ICP

ICAP PRO

Cu

%

≤0.0015

ICP

ICAP PRO

Zinc

%

≤0.003

-

ICP

ICAP PRO

Mg

%

≤0.015

ICP

ICAP PRO

Mn

%

≤0.012

ICP

ICAPPRO

Ca

%

≤0.012

ICP

ICAP PRO

Al

%

≤0.012

ICP

ICAP PRO

Co

%

≤0.001

ICP

ICAP PRO

B

%

≤0.010

ICP

ICAP PRO

S

%

≤0.023

ICP

ICAP PRO

H₂O

%

≤0.4

▽

Karl-Fischer method

Swiss Re 885+831

pH

-

5.1±0.6

Acid-Base Test Method

PHS-3C

Zero-valent iron

ppm

≤0.3

V

Hydrogen method

Gas chromatography instrument

Number of magnetic metal particles

Pcs/kg

≤50

V

Magnetic separation method

Magnetic separation + cleanliness meter

Magnetic foreign body

ppm

≤0.5

V

Magnetic separation + ICP

ICAP PRO

Test items

Unit

Standard

Special
Characteristics

Detection method

Main instruments

D10

μm

≥3

Laser particle size analyzer

Analytical method

Malvern MS-3000 laser particle size analyzer

D50

μm

25±10

Laser particle size analyzer

Analytical method

Malvern MS-3000 laser particle size analyzer

D90

μm

≤150

Laser particle size analyzer

Analytical method

Malvern MS-3000 laser particle size analyzer

Tap Density

g/cm³

1.2±0.2

Tap method

BT-313 Compaction Density Meter

Specific surface area

m²/g

1.3±0.5

-

BET

Tristar2plus

Appearance

Powdery, clean, no foreign matter, uniform color, no clumping.

-

Visual inspection method