1  
Technical name: High tailings high concentration filling goaf technology

2   Technical Scope: non-ferrous metal mines fill mined-out area

3   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   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   Technical application and typical projects

Table 49   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   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.

Steel Pipe

Seamless Steel Pipe is made from a solid round steel `billet` which is heated and pushed or pulled over a form until the steel is shaped into a hollow tube. The seamless pipe is then finished to dimensional and wall thickness specifications in sizes from 1/8 inch to 32 inch OD. Carbon Steel Seamless Pipes / Tubes Carbon steel is an alloy consisting of iron and carbon. The percentage of carbon in the steel affects the hardness, strength of elasticity and ductility of carbon steel. Seamless Carbon Steel Pipe or solid steel ingot is made of the capillary tube through the hole, then through the hot-rolled, cold rolled or cold call is made. Seamless carbon steel pipe in China's steel industry has an important position. Seamless carbon steel pipe material is a round tube, pipe cutting machine embryos to go through cutting about 1 m of length blank, and sent by conveyor belt furnace heating. Billet is fed into the heating furnace, the temperature is about 1200 degrees Celsius. Fuel is hydrogen or acetylene. Furnace temperature control is the key issue. Round tube came out to punch through the machine through air pressure. Generally more common punch is tapered roll perforation machine, the punch high production efficiency, product quality, large diameter hole expansion, can wear a variety of steel. Perforation, round tube has been on three-roll cross rolling, rolling or extrusion. Squeezed off the tube after sizing. Sizing by high-speed rotary cone drill holes into the billet to form a tube. Pipe diameter by the sizing mill to determine the length of the drill diameter. After the pipe through the sizing into the cooling tower, cooling by water spray, steel after cooling, should be straightening. After the steel belt sent by straightening metal testing machine (or pressure test) for internal testing. If the pipe internal cracks, bubbles and other problems will be detected. After the pipe but also through strict quality control manual selection. Steel quality, the use of spray paint numbers, specifications, production lot number. By a crane into the warehouse.

Seamless Steel Pipe, Seamless Pipe, Steel Tube

Shandong Guanzhou Iron and Steel Group Co., Ltd , https://www.shansteelsupply.com