Definition of mining and mining law, applicable conditions and recovery process

Divide the nuggets into mines and pillars. The mining back mining is carried out from the bottom to the top, with shallow-eye collapse, one-third of each ore is disintegrated, and the remaining temporary storage is used as a working platform for continued mining. Uranium mining method for mining and pillar mining.
It is suitable for mining the surrounding rock with stable rock and steep uranium ore body. Due to the large production capacity of the mining method and the low mining cost, it is used earlier in uranium mines. However, due to the large amount of temporary ore deposits, long stacking time, large exposed area of ​​ore, radon and radon progeny precipitated per unit time. The concentration is higher than other mining methods, so the promotion is not large. In recent years, the upwind of the stope has been changed to the downwind, so that the entry of fresh air will not be polluted by cockroaches and scorpions, and the working conditions will be improved, and the proportion of promotion will gradually increase.
     The mining includes rock drilling and blasting, layout and ore, flat field, treatment of turquoise and broken large blocks. In the stope with a smooth patio, it also includes a pacing patio. Rock drilling commonly used 01-45, YSP-45 and other upward rock drilling machines to the blasthole, hole depth of 1.5 ~ 1.8m, also use YT-25 and other gas leg rock drill to level or slightly tilt the blasthole, hole depth 2 ~ 3m . The blasting mainly uses safe explosives such as ammonium nitrate, ammonium oil and ammonium pine wax , and uses non-electrical detonation such as fire detonators or detonating tubes. Each time the ore that has collapsed, 35 to 40% is released, so that the working space for recovery is maintained at a height of 2 m. Flat field and processing of turquoise or manual labor, workers consume a lot of physical strength.

The aluminum die casting part production flow chart

Die casting production flow chart


Commonly used materials of aluminum die casting: ADC12, ZL101, ZL102,A380, AlSi9Cu3, AlSi12(Fe);

The precision of the aluminum die casting: ±0.1mm;

Smoothness of surface of rough part: Ra1.6~Ra3.2;

Shrinkage rate of aluminum die casting products: 0.5%;

Material wastage rate: 5%;

General aluminum die-casting machining allowance: 0.5mm~0.7mm;

Surface preparation methods: Sand blasted, Shot blasting, Powder coating, Painting, Plating, Electrophoresis, Polishing


The specific pressure parameters of aluminum die casting part

Material

Thickness of die casting parts≤3mm

Thickness of Die Casting Parts>3mm

Simple structure

Complex structure

Simple structure

Complex structure

Aluminum alloy

25-35Mpa

35-45Mpa

45-60Mpa

60-70Mpa

Injection speed of die cast process

Pouring liquid metal tie up chamber volume percent

Injection speed(cm/s)

≤30

30-60

>60

30-40

20-30

10-20

High speed computing formula

High speed computing formula


V -------------Cavity volume (CM3);

N ------------ Cavity No;

D ------------ Die-casting drift (CM);

T ------------- Proper filling time.

Holding pressure time

Material

Thickness of die casting part<2.5mm

Thickness of die-casting part>2.5~6mm

Aluminum alloy

1-2

3-8


Aluminum die casting mold temperature

Aluminum die casting mold temperature

Tm --------------- Aluminum Die Casting Mould required working temperature (℃);

Th -------------- Aluminum Alloy pouring temperature (℃);

△ t---------------The temperature control of tolerance (The general is 25℃).


The Aluminum Alloy Die Casting production and QC control

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Aluminum Die Casting Parts

Aluminum Alloy Die Casting, Aluminum Pressure Die Casting, High Pressure Aluminum Die Casting, Aluminum Injection Die Casting

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