34results about How to "Reduce the burden of separation" patented technology

The invention relates to a process for extracting nickel-cobalt from laterite by using resin-in-pulp adsorption technology. The process comprises the following steps of: milling the laterite, and adding sulfuric acid into the milled laterite to perform high-pressure leaching; pouring the ore pulp after the leaching into a reaction kettle for neutral impurity removal; directly pouring the ore pulp after the impurity removal into an adsorption tank to perform resin adsorption; adopting multilevel counter current absorption to perform desorption on the loaded resin so as to obtain pure nickel and cobalt mixed solution; and performing extraction separation to obtain a nickel-cobalt product. The resin can be used repeatedly after regeneration, the damaged resin is less, the service life of the resin is long, the desorption of the loaded resin and the regeneration of a poor resin are performed at normal temperature and normal pressure and are simple and easy to operate without a pressure vessel and heat regeneration device, thereby saving energy resources and reducing equipment investment. The ore pulp after adsorption is uniformly neutralized to reduce the tailings treating cost. The process shortens the technological process, reduces the liquid-solid separation burden, and reduces a great number of washing and filtering process steps, thereby reducing the production energy consumption and reducing the production cost. The process is simple, and the recovery rate of nickel and cobalt is over 90 percent.

The invention discloses a chlorination method for industrial production of sucralose-6-acetic ester and relates to the chlorination method for industrial production of the sucralose-6-acetic ester which is a key intermediate of sucralose. The method specifically comprises the steps of adding 7-11 times of molar ratio of N, N-dimethylformamide into pre-synthesized sucrose-6-acetic ester solid or dry syrup, carrying out homogenization, dissolving in 2-6 times of volume ratio of organic solvent, dripping thionyl chloride with molar weight which is equal to that of N, N-dimethylformamide below 0 DEG C, generating a vilsmeier reagent, stirring, naturally increasing the temperature to room temperature, further using 2-14 hours for slowly increasing the temperature to 110-115 DEG C, keeping the temperature for 1-3 hours at 110-115 DEG C, and carrying out neutralization, solvent removal, dissolution by adding water, decolorization and crystallization after the completion of reaction, so as toobtain a sucralose-6-acetic ester coarse product. The method has the advantages of high yield, simple operation, convenient post-treatment and ability of being applicable to industrial production.

The invention discloses a method for comprehensively recycling lead, zinc, tin and fluorite from tailings. The method includes the following steps that firstly, the tailings are pre-screened; then the tailings of -20 meshes are subjected to ore grinding, and an ore grinding product with the preset fineness is obtained; then the ore grinding product is subjected to floatation which includes one time of rough floatation, three times of finish floatation and two times of scavenging, and lead and zinc in the tailings are recycled; then the floated tailings enter a shaking table to be subjected to re-floatation which includes one time of rough floatation, one time of finish flotation and one time of scavenging, and tinstone is recycled through re-floatation; and finally, the re-floated tailings are subjected to fluorite re-floatation which includes one time of rough floatation, eight times of finish floatation and two times of scavenging. By means of the technical means of floatation, re-floatation and re-floatation, the problems that at present, the recycling rate of poor, varied and thin tailings is low, the cost is high, and pollution is large are solved, and the process is simple and practical.

The invention discloses a gypsum powder airflow separator, which belongs to the gypsum powder production equipment. The technical problem to be solved by the invention is how to avoid the accumulation of large particles at the bottom of the boiling furnace, ensure the boiling effect, improve the quality of the gypsum powder, and at the same time reduce the times of cleaning the furnace, To reduce the labor intensity of workers and improve the work efficiency, the technical scheme adopted is as follows: the structure includes an airflow separation cylinder, a feed cylinder is arranged at the lower end of the airflow separation cylinder, a discharge cylinder is arranged at the upper end of the airflow separation cylinder, and an upper middle part of the airflow separation cylinder is arranged. The position is provided with a material blocking cylinder, a wind blocking structure is set between the outer side wall of the material blocking cylinder and the inner side wall of the airflow separation cylinder, and a large particle outflow structure is set at the lower position of the middle part of the airflow separation cylinder, and the inlet end of the large particle outflow structure is located in the airflow. At the lower position in the middle of the separation cylinder, the outlet end of the large particle outflow structure is located at the obliquely lower position outside the air separation cylinder.

The invention discloses a self-balancing water-seal-type anti-explosion device which consists of a water seal device, a steam-water separation explosion venting device and an intelligent water level monitoring device, wherein a water seal device cylinder body is internally provided with a primary divergent speed reduction device connected with an air inlet pipeline and a secondary divergent speed reduction device connected with an air outlet pipeline; the air outlet pipeline of the water seal device cylinder body is connected with the steam-water separation explosion venting device; the steam-water separation explosion venting device comprises a tank body, an air inlet, an air outlet, a water discharge adapter tube, a pressure relieving device and a separation device arranged in the tank body; an air outlet pipeline of the water seal device is connected with the air inlet; and the water discharge adapter tube is arranged at the bottom of the tank body, and is communicated with the water seal device cylinder body. According to the invention, the automatic monitoring and automatic supplying of a water seal surface are achieved through combining the cycling of steam and water and the time-to-time monitoring of the water level, thus the water seal surface is kept to be constant, and water is prevented from entering a pumping and extracting system, and pipelines are prevented from being blocked so as to guarantee the safe running of the whole system.

The invention belongs to the field of waste incineration equipment and particularly relates to a flue-gas purifying system of an incineration furnace applicable to treating flue gas from incineration of the incineration furnace. The flue-gas purifying system at least comprises a flue-gas leading-out pipe and a treating chamber, wherein a water curtain part is arranged at the treating chamber, and the water discharging direction of the water curtain part is vertical to or intersected with the moving direction of the flue gas at the outlet of the flue-gas leading-out pipe; a precipitate deslagging port is arranged at the bottom part of the treating chamber; the treating chamber is internally provided with a communicating pipe for communicating with an external inner-circulation reservoir and a steam discharging pipeline; a gas discharging pipe of a water-steam separating component extends towards the tail end of a flue and penetrates into an inner cavity of the flue; and a water discharging pipe of the water-steam separating component is communicated with the external inner-circulation reservoir. The flue-gas purifying system also comprises a carbon-powder distributor and a lime distributor. The flue-gas purifying system can provide a basic hardware platform for treating the flue gas of the current high-efficiency incineration furnace, is high in flue-gas treating efficiency and good in working reliability, and can be well qualified for the need of high-efficiency, harmless and rapid treatment of the flue gas from incineration of various current incineration furnaces.

The invention discloses a catalyst for preparing 3-pentanol through 3-pentanone hydrogenation. The catalyst comprises a carbon-based carrier and a multi-metal component recorded as M1-M2-M3 / C, wherein M1 is selected from one of Ru, Mn and Ag; M2 is selected from one of Ir, Au and Cu; and M3 is selected from one of La, Ce and Y. The catalyst is applied to the liquid phase 3-pentanone hydrogenation process. The conversion rate of 3-pentanone can be 100 percent within a short time, and the selectivity of the 3-pentanol is 100 percent. The invention also provides a method for preparing the catalyst, and the industrial preparation is easily realized.

The invention particularly relates to a gas distributor of the vinyl chloride synthesis fluidized bed and a synthesis method of vinyl chloride belonging to the field of chemical equipment and technology. Double distributors or one distributor and one group of gas or liquid nozzles are arranged on the bottom of the fluidized bed. The invention also discloses a method for preparing vinyl chloride by reacting hydrogen chloride with acetylene in a fluidized bed reactor containing the distributor, which comprises controlling the feed temperature, the ratio of composition and flow of the double distributors or one distributor and a group of gas or liquid nozzles, adjusting the temperature of the gas distributor area by of the cold shock principle of the low temperature gas or liquid. The method of the invention has advantages that the temperature control is sensitive and convenient, the highest and average temperature of the gas distributor area are reduced, the active component loss on the catalyst is inhibited and the coke on the catalyst is reduced, thereby prolonging the catalyst service life, improving the purity of the vinyl chloride product and simplifying the product exhaust post treatment with a low cost.

The invention discloses a method for generating 3-pentenenitrile by isomerization reaction of 2-pentenenitrile, which is characterized in that it comprises the following steps: 2-pentenenitrile, catalyst, bidentate phosphorus ligand, Lewis acid, solvent Mix to obtain a reaction system; under the condition of nitrogen protection, the reaction system in step 1 is reacted at a reaction pressure of 0.1 to 0.5Mpa and a reaction temperature of 80 to 150°C; after the reaction is completed, the unreacted 2-pentenenitrile and the product 3-pentenenitrile are separated. The invention has the advantages of increasing the yield of the target product, shortening the reaction process and reducing the difficulty of product separation.