6results about How to "Reduce disposal volume" patented technology

The invention belongs to the technical field of nuclear facility decommissioning, and particularly discloses an underwater laser cleaning and cutting combined machining device and a using method, cleaning and cutting are achieved through refraction and reflection of cleaning laser by scanning an X / Y-axis galvanometer set and a dichroscope and transmission of cutting laser by the dichroscope, and coaxial focusing is achieved through a common field lens; a gas-liquid coaxial composite nozzle is arranged at the bottom, and center auxiliary airflow and annular high-pressure laminar flow water can be independently regulated and controlled; millisecond-level process switching is matched, and instant cutting is carried out after cleaning is completed at the same underwater station. Aiming at the problems of low efficiency, high safety risk, more secondary pollution, poor cutting quality and the like in the decontamination and disintegration process of the high-level metal part of the nuclear power station, the invention does not generate radioactive waste liquid, effectively avoids secondary pollution, remarkably improves the cutting quality, the operation safety and the system reliability, and is suitable for green and efficient retirement operation in a high-radioactivity environment.

This invention discloses a control system and method for reducing mercury emissions from cement kiln dust collector ash discharge. A flue gas mercury analyzer installed on the chimney measures the mercury concentration in the flue gas and transmits the data to a computer. When the mercury concentration in the flue gas is lower than the environmental standard, the dust collector ash is not discharged. When the mercury concentration in the flue gas is higher than the environmental standard, the computer controls relevant equipment to discharge the dust collector ash to reduce the mercury concentration in the chimney. Solid powder samplers installed in the ash hopper of the baghouse dust collector and on the raw material elevator take samples at regular intervals and send them to a solid mercury analyzer. The solid mercury analyzer transmits the mercury content of the dust collector ash and the mercury content of the raw material entering the kiln to the computer. By comparing the input and output mercury levels, the computer calculates the amount of dust collector ash to be discharged. The computer then controls a bidirectional screw conveyor to transport the dust collector ash to a temporary storage silo via a second belt conveyor according to the calculated discharge amount, thereby reducing the mercury emission concentration from the chimney.

The present application relates to the chemical technology field, disclose a kind of recycling method and application of 4-acetyloxy butyric acid methyl ester material.The method comprises: (1) in the presence of sodium methoxide, the raw material containing γ-butyrolactone and 4-acetyloxy butyric acid methyl ester and methyl acetate are made to carry out acylation reaction, while azeotropic distillation is carried out, obtain the dry material containing α-acetyl-γ-butyrolactone sodium salt;(2) the dry material is extracted after being handled and separated, obtain α-acetyl-γ-butyrolactone crude product;(3) the crude product is subjected to vacuum rectification, separate out γ-butyrolactone and 4-acetyloxy butyric acid methyl ester mixture, obtain α-acetyl-γ-butyrolactone fine product.The method fully recycles 4-acetyloxy butyric acid methyl ester produced by α-acetyl-γ-butyrolactone, reduces waste liquid disposal amount;Avoid 4-acetyloxy butyric acid methyl ester and γ-butyrolactone separation, reduce energy loss;Prepared α-acetyl-γ-butyrolactone has higher yield and purity.

The invention discloses a method and system for recovering high-purity calcium fluoride from rare earth ore fluorine-containing raffinate, the rare earth ore fluorine-containing raffinate enters a nanofiltration separation unit after suspended solids and organic impurities are removed in a pretreatment unit, sulfate ions are intercepted by a nanofiltration membrane to form a sulfate concentrated solution, and monovalent fluorine ions enter nanofiltration produced water through the nanofiltration membrane; carrying out induced crystallization reaction on the nanofiltration produced water and lime milk in a calcium fluoride crystallization reactor to generate calcium fluoride crystals; small-particle calcium fluoride crystals obtained by solid-liquid separation from the effluent of the calcium fluoride crystallization reactor are sent back to the calcium fluoride crystallization reactor to serve as calcium fluoride seed crystals, and the water obtained by solid-liquid separation is discharged after reaching the standard; according to the method, the purity of the calcium fluoride generated by the method is stabilized at 90% or above, sulfate by-products can be produced, resource recycling of fluorine and sulfate in the rare earth raffinate is achieved, and the disposal amount of hazardous waste is greatly reduced.

The utility model relates to copper-containing wastewater recovery technical field, and disclose a kind of low concentration copper-containing wastewater efficient recovery copper's device, including copper-containing waste liquid raw material storage tank, lye blending tank, reaction kettle, filter press, beating tank and reuse water tank, copper-containing waste liquid raw material storage tank and lye blending tank are connected with reaction kettle by pump machine, reaction kettle and beating tank are connected with filter press by pump machine, reuse water tank is connected with beating tank by pump machine, reuse water tank is connected with filter press by pipeline, the utility model effectively recycles low concentration copper-containing wastewater and prepares it as higher value copper oxide product, not only reduce the disposal cost of copper-containing wastewater, but also convert it into higher value product, and highly utilize the water filtered out in disposal process for reuse, reduce the disposal amount of back-end wastewater while recycling, and use in-plant self-produced steam, thereby bringing great economic benefits, with great practical value.

This invention discloses a microwave-based method for the treatment and utilization of cold-rolled acid regeneration sludge. The sludge is crushed and then roasted in a microwave kiln. The roasted iron-containing material is further sintered for utilization. The corrosive chlorine-containing gas generated during roasting is transported to an acid regeneration chlorine-containing gas treatment and utilization system to obtain hydrochloric acid. The exhaust gas generated by the acid regeneration chlorine-containing gas treatment and utilization system meets emission standards. This invention uses green electricity for microwave roasting of cold-rolled acid regeneration sludge, eliminating the need for water washing, reducing waste disposal volume, eliminating the use of fuel gas, and preventing additional waste during the treatment process, thus reducing pollutant emissions. The green electricity-driven equipment does not occupy carbon emission limits. Microwave heating is uniform, resulting in better dechlorination under the same roasting temperature conditions. Under the same dechlorination effect conditions, the roasting temperature is lower, reducing energy consumption and carbon emissions. The amount of flue gas generated during heating is small, the proportion of chlorine-containing gas is high, and the concentration of hydrochloric acid obtained in one step is high, reducing energy consumption in the acid production process.