38 results about "Sodium pyrosulfate" patented technology

The method for recovering cobalt-lithium-aluminum from the positive electrode sheet of the scrapped lithium ion battery comprises the following steps: discharging and dismantling the spent lithium ion battery, roasting the spent positive electrode sheet in a box-type resistance furnace, dissolving in water, and filtering to obtain waste cobalt acid Lithium powder and aluminum foil, waste lithium cobaltate powder and sodium bisulfate or sodium pyrosulfate are mixed in a certain proportion and then placed in a ball mill for ball milling. The ball-milled mixture is put into a box-type resistance furnace for roasting at low temperature, and the roasted product is leached with water. Cobalt oxalate and lithium carbonate are obtained from the leaching solution through cobalt precipitation and lithium precipitation operations.

The invention relates to an inorganic ferrous sulfide passivation abluent which is characterized in that: the inorganic ferrous sulfide passivation abluent is composed of components of, by mass: 5 to 15% of sodium pyrosulfate, 15 to 35% of hypochlorite, 0.5 to 10% of trisodium phosphate, 0.1 to 5% of sodium bicarbonate, and 35 to 79% of water. The pH value of the product is controlled at 11 to 12. With the inorganic ferrous sulfide passivator, FeS and oil stains on refining equipments can be effectively and quickly removed; and gases such as H2S, micro-molecular sulfur and alcohol in equipments such as towers and containers can be absorbed. Indexes such as COD of the abluent satisfy an oil refinery sewage discharging standard. With the inorganic ferrous sulfide passivation abluent, environment protection problems such as a FeS passivation problem and an abluent waste liquid discharging problem can be well solved.

The invention discloses a determination method of total aluminum content in steel and alloy. The method comprises the steps of pretreatment and determination, and particularly comprises the following steps: adding distilled water, hydrochloric acid and nitric acid to a sample to be determined to heat and dissolve at low temperature; filtering by slow speed filter paper; taking filtrate as main liquid, fusing the residue by using sodium pyrosulfate, leaching by hydrochloric acid, and merging the main liquid; fixing the volume by using the distilled water, so as to obtain a sample solution to be determined; and determining by using a spectrograph, so as to obtain the target content data. By adopting the determination method, the defects that the wet-process analysis operation process is complicated, the operation is not easy to grasp, more interference elements exist, more chemical reagents are used and the like are avoided, and the characteristics that a plasma emission spectrum is low in detection limit, good in accuracy, small in matrix effect and the like are fully and effectively utilized. The determination method disclosed by the invention is simple and convenient to operate, less in reagent dosage, high in analysis accuracy, short in detection period, and small in environmental pollution, and the determination requirements of total aluminum content in daily steel and alloy can be met.

This invention relates to a method for preparing zirconium oxide. The preparation method is: mixing zircon and soda, reaction under high temperature, cooling the product, adding water and acid; regulation its pH value, filtering, washing and drying the obtained product; the above mentioned product is then added with sodium pyrosulfate, reaction under temperature of 700-800deg.C, cooling, adding water, filtering, washing and drying, obtaining product of powder of mixture of zirconium oxide and silicon oxide; above mentioned mixture is added with solution of sodium hydroxide, reacting under proper pressure and temperature for 2-3hrs, then cooling, separation, washing, drying to obtain the inventive product. This invention has advantages of: low cost, short process, simple operation. And the product is of high pureness, with regular octahedron particles, its size is 1-3um. The power of the inventive product has well dispersiveness, no blocking problem.

The invention discloses a treatment method for improving the conductivity of an anode plate for electrolytic manganese dioxide, which comprises the following steps: (1) injecting the acid waste electrolyte produced in the production process of electrolytic manganese dioxide into treatment tank 1 and treatment tank respectively In the second process, after adding hydrogen peroxide in the treatment tank 1, the anode plate with poor conductivity is pretreated to remove the residual electrolytic manganese dioxide on the surface of the anode plate; (2) Add sodium thiosulfate to the acidic waste electrolyte in the treatment tank 2 , Sodium sulfite or sodium pyrosulfate, redox immersion treatment is carried out on the pretreated anode plate; (3) After the immersion treatment is completed, the anode plate is taken out, and it can be reused after washing with clean water. The invention can remove the oxide layer on the surface of the anode plate used for electrolytic manganese dioxide production without causing damage to the anode body, and can prolong the service life of the anode plate.