46results about How to "No secondary hazards" patented technology

The invention discloses a humic acid type adsorbing material and a preparation method and application thereof, and belongs to the technical field of material preparation and environmental science. Carboxymethyl cellulose or salt thereof, humate and montmorillonite are used as raw materials, a monomer, a cross-linking agent and an initiator are added, and aqueous solution polymerization is performed to obtain the product. According to the humic acid type adsorbing material with the porous structure synthesized by the method, numerous carboxyl active groups in the raw materials and hydroxyl groups in the montmorillonite structure are utilized; a large number of hydroxyl groups and carboxyl groups in a montmorillonite structure can be quickly close to water molecules in water, the hydroxyl groups can form hydrogen bonds, the carboxyl groups can form carboxylate radicals, and finally the purpose of removing organic dye pollutants is achieved through the electrostatic attraction effect of the carboxylate radicals and dye molecules. Meanwhile, a place is provided for adsorption of organic dyes by utilizing a layered structure and a huge specific surface area of montmorillonite. The synthetic raw materials are low in price, the synthetic process is simple, the reaction condition requirement is low, the operability is high, and the synthetic product is environmentally friendly and hasa good application prospect.

The invention discloses an automatic electric switch cabinet fire extinguishing system and a fire recognition method, wherein the automatic electric switch cabinet fire extinguishing system comprises a fire extinguishing agent nozzle which is arranged in an electric switch cabinet; the fire extinguishing agent nozzle is connected with a storage device in which a non-conducting fire extinguishing agent is stored through a pipeline; an electromagnetic valve which is controlled by a central controller is arranged on a pipeline; a photoelectric sensor is also arranged in the electric switch cabinet; and the photoelectric sensor outputs a detection signal to the central controller and then the central controller judges whether to open the electromagnetic valve. The automatic electric switch cabinet fire extinguishing system is capable of responding sudden electric fire and reducing the loss caused thereby. Fire extinguishing agents such as heptafluoropropane and superfine dry powder are used and non-conducting, so that secondary danger caused by conduction of fire extinguishing agents does not occur; and the fire extinguishing agents are environmental-friendly, so that the damage to the environment caused by conduction of fire extinguishing agents also does not occur. The photoelectric sensor is used, so that the fire such as electric arc and the like in the switch cabinet can be rapidly and correctly detected.

The invention discloses filling slurry for a filling mining method and a preparation method for the filling slurry. The filling slurry is prepared from the following materials: tailings, ultrafine powder, cement and debris, wherein the tailings are mill tailings at the concentration of about 20 percent, and are thickened into high-concentration tailings at the concentration of over 65 percent; the ultrafine powder is obtained by finely grinding phosphorous slag which is discharged as waste residue after yellow phosphorus is prepared by a hot method or phosphate ores are calcined by other methods until the fineness is equivalent to that of the cement, and the cement and the ultrafine powder are jointly taken as a cementitous material; and the debris is crushed into particles with the particle size of less than 2cm, and the tailings at the concentration of over 65 percent are conveyed to a filling slurry preparation station through a pipeline and are prepared into filling slurry at the concentration of equal to or more than 70 percent by using stirring equipment. The invention is characterized in that: the filling slurry has a remarkable social benefit; a series of problems about mining filling are solved; and more importantly, the national environmental protection requirements are met, and the secondary harm is avoided. The filling slurry is applicable to the filling mining method and is particularly applicable to middle and low grade phosphorus mines.

The invention discloses a mine subsequent cemented and non-cemented filling mining method, comprising the following steps: (1) preparing chambers; (2) preparing for chamber filling; (3) preparing for filling: making tailing, cement, super-micro powder and aggregate made from mining waste rock into a filling slurry with the concentration of larger than 70 %, carrying out cemented filling by applying pressure or flowing automatically to the prepared mining chambers, and carrying out non-cemented filling only by directly filling the mining chambers with high-concentration tailing having the concentration of larger than 65 % and mining waste rock having the particle size of less than 2 cm; (4) stoping and filling the chambers: stoping and filling the next adjacent chamber in every four chambers, wherein the cemented and non-cemented filling modes are carried out alternately between the adjacent chambers; and (5) managing after filling. The invention has significant economic social benefits, and is suitable for mining with the filling mining method, especially for the mid-low grade phosphate rock.

The invention provides a high-efficiency sulfur-doped zinc oxide nano material preparation method, which comprises the following steps: S1, utilizing a precipitation method to prepare a nano zinc oxide precursor solution; S2, sequentially adding thioacetamide and ethylene diamine tetraacetic acid into the nano zinc oxide precursor solution to react; S3, separating precipitate out after reaction is finished and cleaning and drying to obtain white solid particles; S4, thermally treating the white solid particles. According to the preparation method disclosed by the invention, the ethylene diamine tetraacetic acid is utilized to enable the thioacetamide to be a lot doped into the nano zinc oxide precursor solution; thus, high-concentrate sulfur doping in ZnO is achieved, and a defect structure and surface free energy of a ZnO nano material are changed; furthermore, fluorescent performance of the zinc oxide nano material is greatly enhanced.