Overview of pillar recovery in open mines

Posted on

Our non-ferrous metals, ferrous metals, chemical, nuclear industry, building materials, mining, extensive mining stope mining method in the open air room conditions pillar of the stay. In 1983, 25 non-ferrous metal mines were surveyed, and 23 of them were returned to the mining column in whole or in part. The advantages are simple process, high recovery strength and efficiency, and low cost. However, it is not suitable for mining when the ore value and grade are high or when it is necessary to protect the surface.
According to the stability of the ore rock, the dip angle of the ore body, and whether the upper empty area is collapsed, the pillars of the open-pit mine can be recovered by the empty field method or the caving method respectively.
In addition to the stability of the ore surrounding rock, the empty field method back to the mining column is generally used for the following situations: (1) horizontal or gently inclined thin to medium-thick ore bodies; (2) small-scale blind ore bodies; (3) steeply inclined ore The surrounding rock is stable at the first or subsequent stage of the body, and the empty area does not collapse naturally during the equivalent period. In the first case, only a part of the pillars are selectively recovered; in the second and third cases, the pillars can be all recovered. To ensure safety, a certain thickness of the ore cushion can be left or other measures can be taken. The empty area after returning to the mining column can be treated by isolation, caving or other methods depending on the specific situation.
Under other conditions, the caving method is used to return to the mining column. At the same time as the pillar collapses, it collapses the surrounding rock or transfers the upper part of the overburden rock, and the ore is discharged under the overburden.

Powder Dust Removal Equipment

DMC dust collector products are widely used in casting industry, ceramic industry, glass industry and refractory materials, cement building materials, grinding wheel manufacturing, chemical products machinery processing and other industries of dust removal, the product of a large proportion of metal chips, casting sand, such as lathes, grinding machines, polishing machines, grinders, milling machines and so on, And medium proportion of formicwood powder, plastic powder, dust, ceramic powder, gypsum powder, asbestos powder, carbon powder, pigment and so on, as well as the proportion of light non-fibrous dust have good dust removal effect, the dust removal efficiency of the unit is more than 99.5 percent.

DMC bag dust collector is a small size, high dust removal efficiency of local dust removal equipment, suitable for a variety of independent dust production points, flexible and convenient, local dust collection, local treatment, can effectively ensure the cleanliness of the air.

1. Dust removal equipment adopts high efficiency, low consumption injection device, to achieve low pressure, short pulse injection technology;

2. The filter bag is firmly fixed and easy to disassemble. The filter bag is embedded in the flower board with an elastic ring sewn at the mouth of the bag to completely eliminate dust leakage. It is convenient to disassemble and install the filter bag, and the contact between people and the filter bag is short without pollution;

3. Long filter bag. The filter bag can grow to 6 meters or longer, which greatly breaks through the bag length limit of the pulse dust collector, and the dust removal effect is good;

4. Small footprint. Single row or double row combination design can be carried out according to the treatment gas volume and site location;

5. The dust collector itself has no transmission parts, and only needs inspection during operation, basically no maintenance.



Powder Dust Removal Euipment,Dust Collector,Compartmental Dust Collector,Carbon Steel And Round Stainless Steel Dust Collector

Shandong Jing Xin Powder Equipment Technology Co., Ltd. , https://www.jxpowder.com