Mining and mining process of upward stratified filling mining method

(1) Adoption.
In-pulse acquisition system: the tunnel is usually excavated from the extra-vehicle transportation roadway, and the inner courtyard of the vein is drilled from the vein-passing roadway, and the transportation level is communicated with the ventilation passageway of the upper stage as a passage for transporting personnel, materials, equipment and ventilation; In the large long stope, ventilation shafts are arranged on the two wings of the central patio; more than two smoothing mines and smoothing drainage wells are arranged in the transportation roadway. For thin ore bodies that go long and regular, an in-slope ramp can be placed, which is formed during the recovery process. The thick ore body that is recovered in two steps often shares the down-slope mine and the pedestrian filter well and the return air patio, thereby reducing the procurement cost.

Extra-pulse acquisition system: In the upward stratified filling method using the trackless equipment, there is an acquisition system of the extra-pulse ramp or the extra-pulse equipment well. The slopes are excavated from the roadway or from the surface of the road for personnel, materials and equipment to enter the panel or stope. The ramps communicate with the sectioned roadway, the layered contact road and the mining face. The slope of the slope is 10-15%, a few is 20%, the radius of the curve is 15-20m; the height between the segmented roadways is 8-15m, and the layer height is 3-4m. The dewatering well and the ventilation shaft are arranged in the vein.

The use of electric picking and mining, the spacing of the slipping mine is limited by the transport distance, generally about 30m; when using the trackless self-equipment to mine, the spacing of the slipping wells is 80~120m. Filling chute disposed outside the body or veins, gold mines and two River mouth where mine Ñ„1.5m and Ñ„2.0m patio drilling rig chute.

The supporting structure of the Shunlu Mine has wooden frames, concrete precast members, concrete and steel chutes. The wood frame support wood consumes a lot of energy and the service life is short; the concrete prefabricated components are artificially erected with high labor intensity; the watering concrete and the steel chute support are widely used, the diameter is generally 1.6-2.0 m, and the mineral amount can be released 10 to 150,000 tons.

With the wide application of trackless equipment and the increase of stage height, more out-of-pulse chutes are used, and the diameter of the chute is 2.0-2.4m. It is arranged in the relatively stable surrounding rock of the ore body, and the ore throughput is 200,000-300,000 tons.

(2) Artificial bottom column and cutting work. Mines with upper stratified filling method have higher grades of ore. In order to improve the ore recovery rate, reduce the loss of the bottom column, and create conditions for the next stage of mining the top column, an artificial bottom column can be used.

The artificial bottom column has several forms of tailings cemented false bottom (also laid with a metal mesh or steel rope), concrete false bottom and reinforced concrete false bottom. Usually, the bottom column ore is completely produced, and the false alley, sidewalk and funnel opening are supported by the template, and then the concrete or cemented filling is poured, the concrete number is 40-100, and the curing time is 1.5 to 3 months. A high-concentration fine sand cemented filler with a lime sand ratio of 1:4 was used as an artificial bottom column to obtain a good effect.

Some mines do not use artificial bottom columns at the transportation level, but leave 5 to 7 m pillars. After the first layer of mining, dry or water-sand-filled mines are poured with 0.3-0.8 m thick reinforced concrete floor on the bottom column. The tail-filled mine is filled with tailings cement on the bottom column, and the remaining layers are filled with tailings; the cement-filled mine is cemented with cement mortar of 1:4 on the bottom column, and the upper part of the bottom column is generally used abroad. And the above several layers, filled with cement sand with a ratio of 1:5 to 1:10.

The cutting work is extended in the roadway to form a bottoming space.