67results about How to "Guarantee Occupational Health" patented technology

The invention discloses a method for producing a squatting pan by high-pressure molds. A horizontal high-pressure grouting forming device is used for producing the squatting pan. The high-pressure grouting forming cycle includes the following steps of (1) grout filling, (2) grouting, (3) grout returning and (4) strengthening, wherein in the step of (1) grouting filling, grout is conveyed to the molds through a pneumatic diaphragm pump, in the step of (2) grouting, external pressure acts on the grout in the molds so that the grout can be dehydrated and hardened to be shaped, in the steps of (3) grouting returning, extra grout in a hollow grouting area of a blank is discharged, and in the step of (4) strengthening, compressed air is led to an inner cavity of the blank, so that water in the blank is uniform, and the strength of the blank is improved. The micro-reticular resin mold is adopted, the device is in a horizontal pouring mode, and a reliable guarantee is provided for demolding of the blank, and accordingly the blank is not prone to deforming; the device is of a double-mold structure, multiple high-pressure resin molds can be arranged, and the device can be used for producing wash basins and also can be used for producing squatting pans by replacement of the molds; according to the method, energy conservation and emission reduction can be achieved, clean production can be achieved, the qualified rate of products and production efficiency are greatly improved, and meanwhile, work intensity of workers is greatly reduced.

The invention discloses a shallow-buried large-span water conveying tunnel three-stage five-step digging method which comprises the steps of 1) first-step digging, namely performing forepoling on an upper half tunnel, and digging an upper stage; 2) second-step digging, namely digging a pull trough in the middle of the tunnel; 3) third-step digging, namely digging and supporting the left wall of the tunnel; 4) fourth-step digging, namely digging and supporting the right wall of the tunnel; and 5) fifth-step digging, namely digging and supporting the edge wall of a lower stage. By adopting the digging method, region-by-region digging is effectively executed, overlapping of spaces and time of working procedures are fully used, the digging time periods of the working procedures are rationally used, and the deformation in the tunnel is reduced; and a lining can be quickly closed to form a ring. By adopting the digging method, the digging safety risk is effectively reduced, the digging working efficiency is improved, the digging and supporting closing time is shortened, and the deformation in the tunnel is effectively reduced.

Provided is an arsenic-containing waste residue normal temperature wet method innocent treatment process. After arsenic-containing waste residue is subjected to wet type crushing, water is added to the arsenic-containing waste residue under the normal temperature condition to recycle metallic antimony in the arsenic-containing waste residue through solid-liquid separation, arsenic-rich leaching solutions after solid-liquid separation are subjected to arsenic precipitation with concentrated sulfuric acid, biological agents, hydrogen peroxide and lime milk, and up-to-standard discharge of wateris realized after dearsenification. Produced arsenic residue is made into a solidified body by adding crystallization agents to detoxify and then adding curing agents. The toxicity leaching test of the solidified body can reach the toxicity leaching requirement of general solid waste. The process can greatly reduce environmental pollution brought by accumulation of arsenic-containing waste residue, the comprehensive utilization rate of mineral resources is improved, and the recovery rate of valuable metal is high. After production practice of one year, the recovery rate of antimony is verifiedto be stably more than 90%.