Chromium ore grade and mining technical indicators

Table 1 chrome ore grade and mining technical indicators

project

Deposit and ore type

Endogenous deposit

Rich mine

Lean mine

ω(Cr 2 O 3 )%

Boundary grade

≥25

≥5

Minimum industrial grade

≥32

≥12

Minimum mining thickness

0.3~0.5

1.0

Stone removal thickness

0.5

1.0

Note: 1, with metallurgical ω (Cr 2 O 3) / ω (FeO)> 2 chromium or iron ore concentrates, pyrometallurgical (wet refining of metallic chromium is not limited thereto); ω (SiO 2) ≤ 8% (not limited by smelting high carbon chromium by ore heat method); ω (P) ≤ 0.09%, ω (S) ≤ 0.05%.

2. Chromite or concentrate for refractory materials, ω(SiO 2 )≤10%, ω(CaO)≤2%, ω(FeO)≤14%.

3. For chromite or concentrate for chemical industry, ω(SiO 2 )≤8%, ω(Al 2 O 3 )≤15%.

4, chrome ore with chrome ore, ω (Cr 2 O 3 ) ≥ (10 ~ 20%), ω (SiO 2 ) ≤ 10%.

5, when the required amount of associated chromite selected from PGE reached (0.3 - 0.4) × 10 -6 time, should be assessed.

7. The selection of the minimum mining thickness of the rich ore is 0.5m for the single ore layer and 0.3m for each layer of the double ore layer.

Table 2 General requirements for industrial indicators of nickel deposits

Project

Nickel sulfide ore

Nickel oxide-nickel silicate

Primary ore

Oxidized ore

Pit mining

Lucai

Pit mining

Lucai

Boundary grade (mass score)

%

0.2 to 0.3

0.2 to 0.3

0.7

0.7

0.5

Minimum industrial grade (quality score)

%

0.3 to 0.5

0.3 to 0.5

1

1

1

Average grade of mineral deposit (mass fraction)

%

0.8~2.0

0.6~1.0

1.5

1.2

Minimum recoverable thickness

m

1

2

1

2

1

Stone removal thickness

m

≥2

≥3

≥2

≥3

1 to 2

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6meter Moulding Machine

 

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Spun pile Mould Specification:

Inside diameter(mm)

Wheel base(mm)

 Wheel Diameter(mm)

 Length(mm)

Ø300

2000

510

7-11

Ø350

2000

610

7-11

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2000

610

7-12

Ø450

2000

710

7-12

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2000

710

7-12

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2000

810

7-12

Ø600

2000

810

7-15

Ø800

2000

1010

7-15

Ø1000

2000

1210

7-15

 

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