45results about How to "Strong process" patented technology

The invention relates to an air-coal blowing furnace and a tin concentrate air-coal blowing furnace smelting method, belonging to the technical field of nonferrous metal pyrometallurgy. The air-coal blowing furnace includes a furnace body, a flue, a slag outlet, a tin outlet and a raw material inlet, and also includes an air-coal blowpipe and a pyrite inlet. The furnace body is in the form of a column, and the bottom of the furnace body is conical. The furnace body is divided into a concentrate smelting area and a slag fuming area, and the top of the furnace body is equipped with a raw material inlet and a pyrite inlet corresponding to the concentrate smelting area and the slag fuming area; the method is to first add tin concentrate, reducing agent And selectively add flux to smelt in the reaction zone of the concentrate smelting zone to obtain crude tin and tin-containing slag. After the crude tin is discharged, put pyrite in the slag fuming zone for fuming operation, including SnS smoke and dust volatilization collection, low-tin slag discharge. The method has the advantages of simple process, short process, safe and controllable process, convenient operation and good environmental benefit.

The invention relates to a method for predicting pulling down safety of a surrounding building pile base by blasting demolition of a dangerous bridge. The safety prediction method of the pull-down ofthe surrounding building pile base due to the dangerous bridge demolition blasting comprises the steps that bridge floor height H<0>, bridge floor width b, pier height H and bridge floor density rho are obtained; the bridge floor quality m per unit width is obtained according to the bridge floor height, the bridge floor width and the bridge floor density; the velocity v when the bridge floor contacts the ground is obtained; the largest impact load p<max> when the bridge floor contacts the ground is obtained according to the bridge floor quality, the velocity when the bridge floor contacts theground and the bridge floor width; the pull-down stress sigma<z> in the surrounding building pile base after the bridge floor contacts the ground is obtained; the pull-down load Q<n> generated by thesurrounding building pile base after the bridge floor contacts the ground is obtained according to the pull-down stress sigma<z>; the single pile vertical ultimate bearing capacity Q is obtained; and the pull-down safety coefficient SF is obtained according to the single pile vertical ultimate bearing capacity Q. The safety prediction method of the pull-down of the surrounding building pilebase due to the dangerous bridge demolition blasting has the advantages that the structure is simple, flow path performance is high, and using is convenient.

The invention provides a method for predicting the formation time of tunnel water and mud inrush surface subsidence, comprising the following steps: 1) calculating the buried depth H of the water and mud inrush breach; 2) calculating the equivalent diameter D of the cross section of the tunnel fracture zone; 3) Calculate the natural weight γ, cohesion c and internal friction angle of the soil in the broken zone 4) Calculate the undrained shear strength c of the soil in the broken zone and surrounding rock u ; 5) Calculating the critical shear strength c of the broken zone per unit height due to soil loosening u，cri , 6) Calculate the critical ratio r when the broken zone slides, r=c u，cri / c u ;7) Calculate the time t required for the unit height broken zone to slide down, t=1.06r ‑16.85 ; 8) Calculate the total time T from the start of water and mud inrush to the formation of surface subsidence, T=tH. The invention provides a method for predicting the formation time of surface subsidence of water and mud inrush in tunnels, which has the advantages of simple use, strong flow and reliable results.