34results about How to "Avoid work environment" patented technology

A powder recycling system for a three-dimensional rapid prototyping apparatus is provided. The powder recycling system includes a sealed main body, a negative pressure generator, an air pressure generator, a lighting unit and a heater. When an excess powder removing process is performed to remove excess powder from a three-dimensional object, the excess powder is sieved by a screen mesh and collected by a powder collector. Consequently, the excess powder is recycled.

The invention discloses a silicene film prepared by mechanical peeling and the application of the obtained silicene film in batteries. The two-dimensional nanomaterials are physically covered on the passivated silicon surface of the metal film. After high-temperature treatment, the silicon element diffuses into the two-dimensional The interface between the nanomaterial and the metal film is lowered to room temperature, and the sample is dispersed in a solvent liquid with a surfactant. Polar molecules are very easy to enter the interface between the metal film and the substrate material, and the metal film and the substrate are increased by ultrasonic stirring. Material friction, peeling two-dimensional nanomaterials and silicene from silicon substrates to obtain silicene films. The present invention utilizes mechanical stripping to peel off the silicene thin layer in the liquid phase through physical action, which protects the physical properties of the silicene material, avoids the working environment of high vacuum and high-risk gas, and avoids highly toxic organic reactants The use of two-dimensional nanomaterials can be used repeatedly, which reduces the cost and has broad market application value in the field of solar cells.

The present invention provides an oven including an oven body with an exhaust port and a heat transfer assembly, disposed at a side of the oven body, that includes a top plate and a bottom plate connected by two side plates, and a sealing plate to form an air passage therebetween. The air passage has a first opening near the sealing plate and a second opening away from the sealing plate. The first opening communicates with the exhaust port of the oven body, and the second opening opens to the external of the heat transfer assembly which is arranged so the hot air from the exhaust port may enter the interior of the heat transfer assembly so that the heat energy of the hot air can be absorbed by the top plate and then conducted to the food materials on the top plate to be reused.

The invention discloses a mefenamic acid. The mefenamic acid is prepared by the following steps: taking o-chlorobenzoic acid and 2,3-dimethylaniline as the reactants and weakly alkaline salt as the acid binding agent, and then carrying out C-N condensation reactions in the presence of a copper catalyst. The invention also provides a synthesis technology of mefenamic acid. The synthesis technology comprises the following steps: adding 2,3-dimethylaniline, strongly acidic cation exchange resin, o-chlorobenzoic acid, sodium bicarbonate, a copper catalyst, sodium acetate, and sodium ethyl benzene sulfonate into a condensation reaction tank to synthesize a first reaction liquid; then sequentially adding o-chlorobenzoic acid, sodium bicarbonate, and a copper catalyst into the first reaction liquid, dropwise adding liquid alkali to synthesize a second reaction liquid, adjusting the pH value of the second reaction liquid to obtain a condensation liquid, and finally subjecting the condensation liquid to filtering, decoloring, and purification to obtain mefenamic acid. The provided mefenamic acid synthesis technology has the advantages of few byproducts, high yield, safety, environment-friendliness, energy saving, improved efficiency, and simple operation.

The invention discloses a method and a system for treating sludge in an urban pipe network. The method comprises the following steps: inspection well cleaning→blocking upstream→passing a traction rope→pipeline survey→silt cleaning, which also includes installing a guide device, sludge reduction treatment, drying Silt removal process, a sludge treatment system for urban pipe network, including hoisting system, shuttle cable passer, full-view pipeline surveyor, digging basket and sludge dredging vehicle, and may also include sludge drying treatment vehicle, The optimized combination of system equipment has a wide range of applications, is safe and effective, and does not require personnel to enter a closed and harsh environment for operation. It meets the product requirements of ergonomics and realizes systematization, unitization, and high integration. The cleaning effect is better and meets the needs of modern cities. Ecological environment protection requirements.

The invention discloses a phosphogypsum treatment device and method based on sodium sulfate electrolysis, belonging to the technical field of electrochemical engineering technology application. Including electrolysis unit and reaction unit, sulfuric acid storage tank, acid circulation pump, acid three-way valve and sodium sulfate electrolyzer are connected sequentially, and sulfuric acid storage tank is directly connected with sodium sulfate electrolyzer; sodium sulfate storage tank, alkali circulation pump, alkali three The through valve is connected to the sodium sulfate electrolyzer in sequence, and the sodium sulfate storage tank is directly connected to the sodium sulfate electrolyzer; the alkali three-way valve is connected to the phosphogypsum reactor, and the phosphogypsum reactor, slag discharge pump, filter, filtrate storage tank and The return pump is connected in turn, and the return pump is connected with the sodium sulfate storage tank. In the treatment method of the present invention, sodium sulfate is electrolyzed to generate caustic soda and sulfuric acid, and caustic soda reacts with phosphogypsum to generate slaked lime. The sulfuric acid is returned to the production line of the phosphate fertilizer plant, and the sodium sulfate solution is recycled to recycle calcium and sulfur elements. The device is compact, the structure is simple, the operation is stable, the resource recovery rate is high, there is no secondary pollution, and zero pollution emission is realized.