8results about How to "Reduce refining costs" patented technology

The utility model provides an energy-saving DMAC (dimethylacetamide) refining system which comprises a dehydration system and a rectification system which are connected in series, and the dehydration system is used for removing light components in a prepared DMAC solution; the rectification system is used for removing heavy components in the prepared DMAC solution; the heat exchanger is provided with a first inlet and a first outlet which are communicated, and a second inlet and a second outlet which are communicated; the first inlet is used for introducing a prepared DMAC solution, and the first outlet is used for introducing the prepared DMAC solution into the dehydration system; the second inlet is used for introducing DMAC steam separated from the top of the rectification system into the heat exchanger, and the second outlet is used for discharging liquid after heat exchange and condensation of the DMAC steam through the heat exchanger. The heat exchange between the prepared DMAC solution and the DMAC steam separated from the rectification system can be realized through the heat exchanger, additional heating equipment and refrigerating equipment are not needed, and the DMAC refining cost and energy consumption can be obviously reduced.

The invention relates to the technical field of compound purification, and particularly discloses a malononitrile purification method. The purification method of malononitrile specifically comprises the step of separating malononitrile from a malononitrile crude product through adoption of a melt crystallization method. According to the malononitrile purification method provided by the invention, a vacuum system does not need to be arranged, the required temperature is relatively low, the energy consumption is reduced by 50% or above, the refining cost and refining time of malononitrile are greatly reduced, and the finally obtained malononitrile pure product has extremely high purity and yield.

The invention belongs to the field of metal niobium preparation, and particularly relates to a method for preparing metal niobium through lanthanum thermal reduction, and the method comprises the following steps: S1, mixing niobium oxide with metal lanthanum chippings; s2, putting the mixed raw materials into a crucible, and paving lanthanum powder; and S3, the crucible is heated in a high vacuum environment, a reaction is conducted for 15-30 min under the condition that the temperature ranges from 950 DEG C to 1200 DEG C, and the elemental metal niobium is obtained. The prepared metal niobium is high in purity, the preparation technology is simple, the processing cost is low, the equipment structure is simple, the reaction period is short, the reaction condition is mild, energy consumption is low, and mass production can be achieved.

The invention belongs to the technical field of waste treatment, and particularly relates to a device for manufacturing clean fuel and carbon black from waste tires and waste plastics, comprising: a heating furnace, the top of which is communicated with an exhaust pipe; a horizontal cracking furnace; the slag outlet slag discharge pipe is communicated with the middle part of the rear end of the horizontal cracking furnace; the multi-stage catalytic tower comprises a plurality of catalytic tower bodies; each catalytic tower body is sleeved and fixed with a heating chamber, and the bottom of the heating chamber close to the steam distribution pocket is communicated with an air outlet of the exhaust pipe through a pipeline. By optimizing and improving the relative position relation and the connection relation of all the components, the number of the tank bodies is effectively reduced, the oil refining cost can be reduced, and the refining process of essential oil can be shortened. And secondly, flue gas generated in the heating furnace is utilized to heat the catalytic tower body, and heat in the flue gas is fully utilized. The whole device is ingenious in design, conforms to practical application and has good application prospects.

The invention belongs to the technical field of resource recovery, and discloses a waste rare earth recovery method based on a feature marking strategy, which comprises the following steps: identifying useful wastes containing rare earth compounds by using a Raman spectrum analysis technology, obtaining a three-dimensional model, determining a rare earth element distribution area by using an X-ray fluorescence spectrum analysis technology, and marking, cutting is conducted according to the marked three-dimensional model, the part containing the rare earth element distribution area is reserved to serve as a to-be-refined object, and finally rare earth refining is conducted on the to-be-refined object. According to the method, the useful waste containing the rare earth compounds is screened out firstly, then the rare earth element distribution area is accurately positioned on the useful waste, targeted cutting and refining are conducted, the utilization rate of chemical reaction raw materials is increased, the refining cost is reduced, and the refining time is shortened.

This invention discloses a method for cold recovery of LF refining slag and its application, belonging to the field of steelmaking solid waste recycling technology. This invention recovers LF refining slag containing aluminum steel. The process involves pretreatment to rapidly stabilize the steel slag, digesting free calcium oxide and magnesium oxide, mixing the digested LF refining slag with a binder, pressing it into refining slag balls, and then drying them to obtain finished slag balls with a CaO / Al2O3 value of 1.7-2.5, an R value of 5.0-8.0, an S capacity ≤1.5%, and an average S content of 0.020%-0.150%. These finished slag balls can be used as slag-forming agents or slag-generating agents in converter smelting processes; reducing converter slag-forming agent consumption, reducing the input of LF refining slag-forming materials, reducing refining costs, reducing steel slag emissions, and achieving the goal of resource utilization of refining slag. When used in converter smelting, the finished slag balls obtained by this invention can lower the melting point of the converter slag system and improve the reaction effect between steel and slag.

This invention discloses a method for preparing a crude isocyanate product with low copper content. The method uses copper-consuming substances and an inert solvent suitable for phosgenation processes as copper removal additives. The steps include: removing unreacted phosgene from a photochemical reaction solution containing isocyanate, phosgene, and other impurities; mixing the photochemical reaction solution with the unreacted phosgene removed and the copper removal additive, and performing a complexation reaction under ultrasonic conditions; cooling the resulting reaction solution to precipitate Cu complexes, followed by solid-liquid separation; stripping the liquid phase after solid-liquid separation with hydrogen chloride, and then removing the inert solvent under reduced pressure to obtain a crude isocyanate product with low copper content. After treatment by the above method, the copper impurity content in the crude isocyanate product is less than 3 ppm, thereby effectively improving product quality, reducing system blockage problems in subsequent separation processes, and the process is simple and has low operating costs.

The large-evaporation-capacity low-pressure spray head comprises a flow channel pipe and a spray nozzle which are communicated, the flow channel pipe is provided with a first limiting body, a second limiting body and a swing body, the swing body is movably installed between the first limiting body and the second limiting body, and the swing body is connected with a water dispersing disc. The water dispersing disc is provided with a water dispersing needle located in the center and a plurality of flow channels arranged in the circumferential direction of the water dispersing needle, the flow channels rotationally extend from the water dispersing needle to the edge of the water dispersing disc, and water dispersing rib plates extending into the flow channels in the axial direction of the flow channels are arranged in the centers of the flow channels close to the edge of the water dispersing disc. The spray nozzle is used for jetting water to the water dispersing needle and driving the water dispersing disc to swing up and down and circumferentially around the spray nozzle along with the swing body, the spray nozzle can give consideration to the jetting range and the stable operation characteristic under the low-pressure working condition, the atomization evaporation capacity and the combination uniformity of the spray nozzle are effectively improved, the evaporation rate can reach 16% or above, and the Crisqin uniformity can reach 90% or above. The swinging body is detachably connected with the water dispersing disc, dismounting and replacement are easy, and the requirements for waste liquid recovery and cost saving of modern industries such as the mining industry are met.