33results about How to "Protect occupational health" patented technology

A high-efficiency dust-collecting and polishing workbench, including a backboard, a baffle, a worktop, a human body sensor, a dust-collecting drawer, an air duct, a built-in rectification structure, an equipment shell, and a lighting lamp; the backplane is fixed on the equipment shell, The working surface is embedded in the equipment casing, and baffles are arranged on both sides of the working surface; the dust collection drawer is embedded in the equipment casing, and the dust collection drawer is disassembled by the handle; the built-in rectification structure is formed by splicing three enclosures. The hollow structure is embedded in the equipment shell; the equipment shell includes a front rectifying plate and a top rectifying plate, and the equipment shell cooperates with the built-in finishing structure to determine the air volume distribution and wind speed distribution of the workbench backplane and the workbench; the equipment shell There are two lifting rings on the top to facilitate the installation and transportation of the equipment; there is a lighting lamp under the top plate of the equipment shell to ensure the required illumination for grinding. The workbench has simple structure, high dust capture rate, automatic control and easy cleaning.

The invention provides a tunnel excavation construction organization method based on the three-step method. The invention innovates the tunnel excavation construction organization method, adjusts the workload of each step by mixing and arranging the operation teams, and comprehensively considers each operation. The time required for the construction of the process can match the operators of each process, the amount of work tasks, and the work time, forming a construction organization mode combining flow operation and parallel operation, which can effectively shorten the cycle time of single excavation of tunnels constructed by the three-step method , Improve the excavation construction progress.

The invention discloses an equipment for producing trichlorosilane by comprehensively utilizing waste silicon powder. The equipment comprises a trichlorosilane synthetic furnace mixed gas outlet pipe connected with a high-efficiency cyclone separator; wherein a material discharge port of the high-efficiency cyclone separator is connected with a silicon powder recovery tank; a gas outlet of the high-efficiency cyclone separator is connected with a primary cyclone separator; a primary slag storage tank is arranged below the primary cyclone separator; the gas outlet of the primary cyclone separator is connected with a secondary cyclone separator; a secondary slag storage tank is arranged below the secondary cyclone separator; the gas outlet of the secondary cyclone separator is connected with a primary bag-type dust remover and a secondary bag-type dust remover in turn; both the material discharge ports of the primary bag-type dust remover and the secondary bag-type dust remover are connected with the silicon powder recovery tank through slag blowing pipes; and the material discharge port of the silicon powder recovery tank is connected with a recovery port of the trichlorosilane synthetic furnace. The equipment has the characteristics of obvious energy conservation effect, high environmental protection benefit, high safety factor, unique process, simplicity and long service life, and is easy to operate and the like.

The invention discloses a titanium dioxide surface treatment method and modified titanium dioxide. The method uses silane and phosphoric acid ester to obtain an oligomer with a viscosity of 1-500cst and a polymerization degree of 5-20 through hydrolysis and polycondensation reaction. Polymer is used as a surface treatment agent to treat the surface of titanium dioxide, and the obtained modified titanium dioxide has high fluidity and temperature resistance, which is conducive to improving the use efficiency of titanium dioxide in industrial applications; it also has low dust emission, Reduce the amount of dust in the air of the production workshop, so that the environment of the finished product packaging workshop of titanium dioxide and the downstream use workshop environment of titanium dioxide can meet the national regulatory benchmarks: GBZ 2.1‑2007 "Restrictions on Occupational Exposure to Hazardous Factors in the Workplace" to protect the health of employees Occupational health, improving the air quality around the enterprise.

Disclosed is a multi-tunnel construction method based on weak interlayers, the method comprising the following steps: measuring the position of weak interlayers, uniformly distributing conduits in the weak interlayers, grouting the weak interlayers via the conduits to form a grouting area, A number of tunnels to be constructed are evenly distributed on both sides of the weak interlayer, and the geotechnical parameters of the tunnels are measured. Blast holes are evenly distributed in the core area, and blast holes and energy-absorbing holes are arranged in the buffer zone. The holes are surrounded by the energy-absorbing holes, and the non-adjacent tunnels continue to be continuously blasted in a predetermined order until all the tunnels are blasted. slurry, reduce the number of blast holes and / or reduce the amount of explosives in the blast holes, non-adjacent tunnels are blasted continuously in a predetermined order and make the displacement change of surrounding rock and / or the change of surface settlement less than the predetermined threshold.

The invention relates to a method for extracting metal zinc powder with different purposes from zinc dross, in particular to a method for treating zinc dross by adopting ore grinding and dust collection equipment and metallurgical equipment as well as a metallurgical process to obtain metal zinc powder with different particle sizes and different purposes, which belongs to the cross field of the ore grinding and metallurgy technology. The method comprises the following steps: vibrating and crushing the zinc dross, and crushing and screening by using a ball grinding mill; carrying out tertiary screening on collected dust and powder dust of each pipeline; and collecting the dust by using the dust collection equipment. The invention has the advantages that the powder dust is not discharged torealize environmental friendliness; and three kinds of metal zinc powder and two kinds of residues in a return zinc smelting process are obtained only by adopting a physical crushing method, so that the recovery rate of zinc is improved, and the highly-efficient separation and the zero discharge of valuable elements are realized. The invention solves the problem of large quantity of Cl ions generated in a zinc hydrometallurgy process and simultaneously realizes the effects that the whole process is closed together with products, the zinc content of the various zinc powder is more than or equal to 98 percent, and the total recovery rate of the zinc is 99.5-100 percent.