62 results about "Niter" patented technology

The invention discloses a method for removing chromium during recycling sodium tungstate from waste tungsten. The method comprises the following steps of: smelting the waste tungsten saltpeter with saltpeter to leach alkaline coarse sodium tungstate solution; keeping the temperature of the sodium tungstate solution between 60 and 90 DEG C under an alkaline condition; adding a proper amount of precipitating agent into the solution in a ratio of 10m<3> per 10 to 50 Kg; heating the solution and keeping the temperature under a condition of stirring for precipitation reaction; ensuring the pH of the sodium tungstate solution is more than 8.0 in the reaction process; stirring the solution and keeping the temperature for 2 to 10 hours; and finally, filtering the solution to remove chromium slag sediment generated by the reaction, and obtaining the qualified high-purity sodium tungstate solution. The method is simple in operation, large in processing capacity and simple in process flow, achieves a chromium removal rate up to 99 percent and a chromium loss rate less than 0.1 percent, is low in investment cost and suitable for industrialized production, can effectively remove impurity element chromium in the sodium tungstate solution, and meets the requirements of high-quality tungsten products.

The invention provides a vehicle scheduling algorithm based on a human-vehicle binding mode. The vehicle scheduling algorithm is implemented by the steps of: (1) constructing a vehicle scheduling model, and solving the vehicle scheduling model to obtain a vehicle scheduling scheme; (2) regarding the vehicle scheduling scheme as an initial solution for a driver scheduling problem, and iteratively performing local search improvement; (3) introducing a destructive reconstruction method into the local search process for disturbing a current solution; (4) iteratively performing the step (2) and thestep (3) for Niter times, wherein Niter is a number of local search iterations; (5) iteratively performing the steps from (1) to (3) for Mstart times, wherein Mstart is a number of algorithm multiplestartup times; (6) improving a feasible shift chain obtained in the steps (2), establishing an SCP model, and acquiring a superior shift chain combination. The vehicle scheduling algorithm adopts theiterative local search algorithm, and introduces the destructive reconstruction method into the local search process for disturbing the current solution, thereby solving the problems of low labor efficiency of drivers, high driver cost, unbalanced driver tasks and possible increase of vehicle numbers in the traditional algorithm.

The present invention is directed to an automatic washer system mounted within a maple sugar evaporator above the rear flue pan for removing niter and sediment built up during the boiling of sap. The evaporator comprises a furnace, a steam hood, a pan and a nozzle for washing the pan. The steam hood extends over the furnace. The pan is mounted to the furnace and under the steam hood. The nozzle is mounted over the pan. Cleaning fluid is sprayed from the nozzle to clean the pan by an automated process.

The invention relates to a kind of technique field of inorganic chemical industry, which is a kind of preparation craft of niter. To solve such problems existing preparation craft of niter as that sources of raw material is restricted, production cost and energy consumption is high and quality of products is inferior, the invention uses potassium chloride and dilute nitric acid react to form potassium chloride, dilute nitric acid, niter and hydrochloric acid, take a great of hydrochloric acid and nitric acid out through distillation, then heat and concentrate them to make the mixture turn into saturated solution which becomes neutral when put into sodium carbonate and regulated, the solution reacts with surplus little hydrochloric acid and form sodium chloride at the same time. Finally, it separates niter out making use of different solubility of niter, sodium chloride and potassium chloride at the same temperature. Sources of raw material in this invention are extensive, the production cost is relatively low; Operations such as chemistry reaction, distillation and concentration are finished at the same reaction equipment, process of operation goes on under normal atmosphere and save investment of equipment; it is easy to operate and separate; get finished product using method of mechanism filter-pressing, it is simple to operate with little investment.

This invention relates to preparation method of a environmental-protecting acousto-optic firecrackers. The process: adopt bismuth oxide, niter, antimony sulfide, strontium carbonate, magaluma powder, PVA latices, Taiwu leaf powder or spoceleaf tree leaf powder as raw material to prepare centre particle; takes cupric oxide, magaluma powder, Taiwu leaf powder or spoceleaf tree leaf powder, cupric oxide, cypress leaf powder or yellow cinnamon leaf powder,industrial alcohol and so on as raw material to prepare coat composite; mix centre particle and coat composite to prepare color firecrackers particle; put color firecrackers in plastic film coat that has fuse to prepare product.