11 results about "Sodium peroxide" patented technology

A method for recovering platinum group precious metal in a silicon carbide DPF catalyst comprises the steps that S1, smelting treatment is conducted, specifically, the silicon carbide DPF catalyst is crushed and then mixed with a smelting agent in a layered mode, a smelting reaction is conducted at the high temperature, and the smelting agent is composed of sodium carbonate and sodium peroxide; s2, leaching and separation are conducted, specifically, after the smelting product obtained in the step S1 is cooled, acid leaching treatment is conducted through hydrochloric acid, leaching liquid containing platinum group precious metal and residues are obtained through filtering separation, the residues are washed, and washing liquid is added into main leaching liquid; and S3, precious metal enrichment is conducted, specifically, the leachate obtained in the step S2 is enriched through a chemical precipitation method, the obtained precipitate is dissolved with aqua regia, and a platinum-palladium chloride mixed solution is obtained. The method is high in recovery rate, and under the optimal condition, the recovery rate of platinum can reach 91% or above, and the recovery rate of palladium can reach 96% or above; the process is simple, the cost is controllable, the used smelting agent is a common chemical raw material, and the cost is low.

The invention discloses a method for determining the content of impurities in high-purity iridium, and relates to the technical field of impurity detection. The method comprises the following steps: taking an yttrium oxide crucible as pretreatment equipment, carrying out alkali fusion treatment on a high-purity iridium wire sample by using sodium peroxide and NaOH, and dissolving a fused block by using hydrochloric acid to obtain a sample solution A; and then eluting the sample solution A by using a cation exchange column to remove Na < + > to obtain a solution B, and finally determining the contents of Rh and Pt in the solution B by using ICP-MS (Inductively Coupled Plasma Mass Spectrometry). The detection method is high in accuracy, good in repeatability and suitable for rapid and accurate detection of the impurity content in the high-purity iridium wire.

The invention provides a washing regeneration complexing agent for a waste oil adsorbent, a preparation method and a regeneration method of the waste oil adsorbent, and aims at performing regeneration treatment on an invalid adsorbent after treating waste electric oil to recover the activity of the adsorbent. The washing regeneration complexing agent is prepared by mixing alkali, sodium peroxide, rare earth oxide, an organic solvent and a surfactant; the regeneration method comprises the following steps: putting the invalid adsorbent into the ultrasonic bubbling cleaning device, adding the washing regeneration complexing agent to clean and remove residual oil in the invalid adsorbent and dredge internal pore channels of the adsorbent, then introducing water vapor to effectively remove pollutants such as organic matters remaining in the adsorbent, and finally drying to obtain the regenerated adsorbent. The process flow is simple, the performance of the regenerated adsorbent is greatly improved, the regeneration stability is high, and the cyclic utilization of the waste oil adsorbent is realized.

The invention provides a method for determining the content of precious metal elements in an automobile purification catalyst, and belongs to the technical field of analysis and detection. According to the method, a composite melting system composed of sodium peroxide, anhydrous sodium metaborate and sodium tungstate is constructed, an automobile purification catalyst sample is subjected to efficient melting decomposition, complete leaching of a melt is achieved in combination with a hydrochloric acid and tartaric acid composite acidification system, a tin-tellurium coprecipitation enrichment technology is introduced on the basis, and the purity of the automobile purification catalyst sample is improved. Trace precious metal elements such as platinum, palladium and rhodium are selectively precipitated and effectively enriched, and matrix interference is remarkably reduced; and then adding an indium internal standard solution and carrying out quantitative determination by adopting inductively coupled plasma emission spectrometry, thereby realizing high-sensitivity and high-accuracy analysis of the noble metal element. The method effectively solves the problems of incomplete sample decomposition, low precious metal recovery rate, serious matrix interference, poor detection result stability and the like in the prior art.

The application discloses a method for rapidly and accurately determining the phosphorus content in dolomite and limestone, and belongs to the technical field of raw material analysis. The method provided by the application comprises the following steps: melting a sample by using a mixed flux containing sodium carbonate and sodium peroxide, and detecting the phosphorus content by using a sodium fluoride-stannous chloride-phosphorus molybdenum blue colorimetric method. The method provided by the application can more accurately determine the phosphorus content in dolomite and limestone, the recovery rate of a standard addition recovery experiment is between 98-103%, and accurate data can be provided for the application of dolomite and limestone.

The present application relates to the technical field of battery material preparation, and particularly relates to a hard carbon composite material, a preparation method and a sodium ion battery. The preparation method comprises the following steps: providing a carbon source, sodium peroxide and phytic acid in a preset ratio to be mixed to obtain a mixture; performing a reduction reaction and a first heating in the mixture to obtain a porous hard carbon precursor; introducing borane gas into a reaction space in which the porous hard carbon precursor is located, and performing a second heating and a deposition reaction to obtain the hard carbon composite material. The present application further provides a hard carbon composite material and a sodium ion battery. The problems of low energy density and poor fast charging performance of the hard carbon used in the sodium ion battery are solved.

The application discloses a method for measuring tin content in polymetallic ore by alkali-salt acid-hydrofluoric acid acidification complexing, and belongs to the technical field of ore analysis and testing. The method is aimed at the problems of interference in tin determination and low recovery rate caused by high phosphorus, high aluminum, high silicon and complex matrix containing niobium and tantalum in the existing sulfuric acid system. The method adopts sodium peroxide to melt and decompose the sample, adds hydrochloric acid-hydrofluoric acid mixed acid for acidification complexing after hot water extraction, converts silicon, aluminum, niobium and tantalum into soluble fluorine complex, effectively inhibits the formation of colloids and the adsorption loss of tin, and then combines with inductively coupled plasma emission spectrometry to determine the characteristic spectrum of tin. The method has a standard addition recovery rate of 101-105%, and the comparison result is accurate and reliable compared with the potassium iodate titration method. The method is simple, efficient, effectively eliminates the interference of complex matrix, and is suitable for accurate determination of tin in high-phosphorus, high-aluminum and complex ore samples containing niobium and tantalum such as lithiophilite.

The invention relates to an ore melting agent for lepidolite concentrate and a lithium extraction process. The process comprises the following steps: grinding and mixing potassium pyrosulfate and lepidolite concentrate, then adding sodium peroxide, carrying out high-temperature calcination on the mixture of potassium pyrosulfate, sodium peroxide and sodium peroxide, leaching the calcined product by using strong acid to obtain lithium-containing filtrate, and extracting lithium element from the lithium-containing filtrate; according to the lithium extraction method for activating the lepidolite ore through potassium pyrosulfate-sodium peroxide coupling, potassium pyrosulfate serves as a good ore melting agent, in the process of extracting the lithium element from the lepidolite ore, potassium pyrosulfate can react with the lithium ore, and the lithium element is further extracted through coupling activation of potassium pyrosulfate and sodium peroxide; the lithium element is generated in the form of soluble sulfate of LiNaSO4, so that the lithium leaching concentration is high, and the lithium extraction rate is effectively improved.

The application relates to the technical field of waste lithium ion battery recycling, in particular to a method for lithium recovery by low-temperature efficient deconstruction of lithium iron phosphate based on the local strengthening effect of sodium peroxide. The method comprises the following steps: S1, uniformly mixing lithium iron phosphate material and sodium peroxide according to a preset mass ratio, grinding and refining to obtain a dry mixture containing sodium peroxide; S2, placing the mixture in a calcination device to obtain a calcination product; S3, water immersion separation: stirring and leaching the calcination product in deionized water, and performing solid-liquid separation to obtain a lithium-containing aqueous solution and an iron-based leaching residue; S4, lithium recovery and purification: removing impurities from the lithium-containing aqueous solution by separation and purification to obtain a lithium salt product; and S5, iron resource recovery: performing acid leaching treatment on the iron-based leaching residue to obtain an iron-containing leaching solution, so that the iron resource recovery is realized. The application solves multiple technical bottlenecks such as large acid consumption in the existing hydrometallurgy, high energy consumption in the pyrometallurgy and insufficient activity of conventional alkaline salt calcination.

The invention relates to the technical field of chemical analysis of materials, in particular to a dissolution method of corrosion-resistant YSZ powder, and aims to solve the problems that the YSZ powder is difficult to dissolve due to a stable cubic phase structure and the existing mixed acid method has high toxicity and high risk, and the dissolution method comprises the following steps: firstly, mixing sodium peroxide and a dry YSZ sample with uniform granularity according to a mass ratio of (15-20): 1; placing in a crucible; secondly, carrying out heat preservation melting at 600-700 DEG C for 15-20 minutes, and dissolving YSZ by using sodium peroxide; and finally, transferring the melt to a beaker, boiling and washing with deionized water, and adding 20-25 mL of hydrochloric acid for acidification, so that the sample is completely dissolved. According to the method, use of highly toxic reagents such as hydrofluoric acid is avoided, operation is easy and convenient, dissolution is complete, and a reliable pretreatment scheme is provided for accurate determination of yttrium oxide and impurity elements in YSZ.

The invention relates to the technical field of single-walled carbon nanotube films, and provides a single-walled carbon nanotube purification method, system and equipment and a readable storage medium. The purification method comprises the following steps: uniformly mixing a single-walled carbon nanotube crude product with sodium peroxide or sodium nitrate, and calcining to obtain a single-walled carbon nanotube crude product; the calcination treatment comprises the following steps: obtaining a material response coefficient according to a reference calcination temperature, a gas constant and carbon layer fracture apparent activation energy; constructing an optimal calcination temperature model according to the reference calcination temperature, the raw material metal impurity content and the material response coefficient; and obtaining the optimal calcination temperature based on the optimal calcination temperature model, and performing calcination treatment according to the optimal calcination temperature. According to the method, the optimal calcining temperature model is constructed by associating the metal impurity content of the raw material with the material response coefficient, and calcining treatment is carried out at the optimal calcining temperature obtained based on the optimal calcining temperature model, so that the limitation of fixed calcining temperature in the prior art is broken through, and dynamic calcining temperature regulation and control are realized.