1 Â Technical name: High tailings high concentration filling goaf technology
2 Â Technical Scope: non-ferrous metal mines fill mined-out area
3 Â Technical introduction
3.1 Basic principles
A high-concentration filling material for the whole tailings is prepared by using a vertical sand silo. Through special vertical sand silo and pressure-controlled flow-assisted rhubarb pulping technology, the ultra-fine-grained full-tailed sand is directly prepared into a high-concentration mortar, and cement and other auxiliary materials are added according to a certain ratio, and the mixture is thoroughly stirred and mixed by a stirring tank. After adjusting the concentration, the high-concentration full-tail mortar or cemented full-tail mortar is transported to the goaf by gravity. Effectively control the ground pressure in the mining area to achieve safe and efficient mining of deep wells.
In the production, the topping mode is determined according to the top structure of the stope. The top of the stope is filled in stages , and the filling is stopped when filling the top plate of the stope at 0.3~0.5m . After the filling body is completely condensed, the high sand concentration is 1:4. Slurry, the last forced extrusion of the top, stop filling when filling or unsealing the dewatering tube.
Through the successful experience and force analysis of the application of filling and retaining walls at home and abroad, the filling height of the retaining wall is limited to 1.3m ; the filling retaining wall preferentially selects the wooden reinforcing mesh filter cloth structure and the steel wire mesh mesh filter cloth structure, while in the out Reinforced concrete retaining walls are used at both ends of the mine ditch and the exit of the winding road.
3.2 Â Key technology
The stope filling technology mainly selects reasonable proportion and concentration of filling materials, adopts economical dewatering method and filling retaining wall structure to achieve safe mining and backfilling purposes.
The principle of filling ratio is as follows: ( 1 ) The stress applied to the filling body is less than the strength of the filling body, and the influence of blasting vibration on the stability of the filling body is considered, and the safety factor F>1.2 is taken ; ( 2 ) the strength of the filling body satisfies the pillar Under the premise of mining requirements, the cement consumption should be reduced as much as possible to save the filling cost. The mining method requires that the strength of the filling body is greater than 2Mpa , and the mixing strength test of the full tailings is required. The slurry concentration needs to be maintained at 73%~75% . The bottom structure of the stope and the position of the central diverticulum are filled with the slurry with a sand-sand ratio of 1:4 , and the position of the top diverticulum is filled with a 1:10 slurry. The rest of the position is appropriately reduced according to the height of the filling body, and the position with a large difference in height may be partially filled with a mortar with a sand ratio of 1:12 to reduce the cement consumption.
4 Â Technical application and typical projects
Table 49 Â Investment and income of typical projects
Total investment | 1.2 million yuan | Of which: equipment investment | 1 million yuan |
Operating cost | 140,000 yuan / year | Equipment life | 8 years |
Comprehensive utilization benefit | 400,000 yuan / year | Investment recovery period | 4 years |
Copper Group to build a total investment of 1.2 million yuan filling technology, the use of tailings in the amount of 30 000 t, in utilization efficiency of 40 million.
5 Â Application effect and promotion prospects
The high-concentration whole tailings slurry is used to continuously fill the goaf, and the ground pressure in the mining area is effectively controlled to achieve safe and efficient mining. The high-concentration full tailings filling technology realizes low-cost full tailings filling, solves some technical problems in high-concentration full tailings filling, ensures the normal production of metal mines, and can be widely used in filling mining or post-filling mining technology. Metal mines have promoted and changed the mining process and mining methods of metal mines, laying a technical foundation for non-waste mining.
Sheet Metal processing is formed by laser cutting or stamping process, shear and bending, welding, riveting. The Sheet metal fabrication used are cold-rolled plate, hot-rolled plate, galvanized plate, copper,brass, copper, beryllium copper, aluminum, stainless steel. Sheet metal fabrication processing steps: according to the parts drawing (3D) expanded into a plan (2D), laser cutting or die stamping shape, CNC punching each bending part, should pay attention to the direction of the burr of the workpiece. Then the students are welded or riveted (some). Surface treatment after processing: electroplating, passivation, sand blasting,powder coating,brushing, anodized treatment. Products are generally made for the connection and the outer cover. Applications in automobile parts,robotics, drone, communications, medical devices, industrial automation equipment.
Sheet Metal
Sheet Metal,Precision Sheet Metal Stamping Parts,Leaser Cutting Sheet Metal,Anodized Aluminum Bending Parts
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