7 results about "Arsenic oxide" patented technology

The invention belongs to the technical field of waste resource utilization, and particularly relates to a method for preparing crude arsenic by recycling arsenic-containing hydrogen gas. The method comprises the following steps: in an oxygen-isolated environment, introducing arsenic hydride-containing gas into a sulfuric acid aqueous solution with the mass fraction of 70%-98%, carrying out an oxidation-reduction reaction to obtain slurry containing crude arsenic, and carrying out solid-liquid separation to obtain a crude arsenic product. According to the method, the arsenic hydride gas can be directly converted into the arsenic elementary substance, so that the recovery of arsenic in the arsenic-containing material is realized. Concentrated sulfuric acid can fully oxidize arsenic hydride in a specific concentration range, and the arsenic hydride is prevented from being excessively oxidized into arsenic trioxide. Compared with other acidic or oxidizing solutions, the method has the advantages that the crude arsenic product with the purity larger than or equal to 95% can be directly obtained under the normal-temperature and normal-pressure conditions, the generated by-product dilute sulphuric acid can be circularly used for absorbing arsenic hydride again or used for leaching materials such as zinc arsenate-containing smoke dust to generate new arsenic hydride-containing gas, and therefore a closed-loop circulation process is formed; and efficient resource recovery and environment-friendly treatment are realized. The method is short in technological process, low in equipment requirement and small in energy consumption, the crude arsenic can be used as a precursor for preparing the high-purity arsenic, and a feasible scheme is provided for safety treatment and resource utilization of arsenic hydride in the industrial processes of metallurgy, wet refining and the like.

The invention discloses a flame-retardant master batch for a PVC cable material with low dust dissipation and high flame retardance and a preparation method of the flame-retardant master batch. The flame-retardant master batch is prepared from the following raw materials in parts by weight: 10-15 parts of polyvinyl chloride resin, 5-10 parts of a plasticizer, 1-3 parts of a filler, 1-2 parts of a stabilizer, 0.5-1.5 parts of a compatilizer, 0.2-0.5 part of a lubricant, 0.1-0.3 part of an antioxidant and 60-90 parts of a flame retardant. According to the invention, the powdery arsenic-containing flame retardant is prepared into PVC base material master batch particles, and a special compatilizer and a standardized production protection system are matched, so that the problem of dissipation of arsenic oxide dust is solved from the source; meanwhile, a low-temperature soft mixing process of an internal mixer is adopted, so that the high-content flame retardant is uniformly dispersed in the PVC base material; the prepared master batch is good in compatibility with the PVC cable material, the oxygen index can be remarkably increased by adding 3% by mass of the master batch, the flame-retardant efficiency and the production cost are both considered, the preparation process is stable, the problems of overmolding and scorching are avoided, and the industrial large-scale production requirement is met.

The invention provides an arsenic-containing anode slime treatment method which can comprise the following steps: drying arsenic-containing anode slime, and screening to obtain anode slime powder; and the anode slime powder and a reduction arsenic fixing smelting agent are mixed, reduction smelting is carried out in the inert atmosphere at the temperature of 400-500 DEG C till the reaction is finished, cooling is carried out to the room temperature, a product containing elemental arsenic is obtained, and the reduction arsenic fixing smelting agent is a mixture of carbon powder and metal Bi. According to the method, reduction smelting of solid arsenic can be achieved at low temperature, it is avoided that arsenic enters smoke in the form of arsenic oxide in a traditional method, and arsenic harm is avoided.

The present application relates to a method for separating arsenic and antimony based on gas phase oxidant, belonging to the field of nonferrous metallurgy and pollution control technology. The arsenic and antimony containing material is added into a reaction furnace, heated to a temperature of 923-1173K under a protective gas atmosphere, so that the arsenic and antimony containing material is melted or softened and forms a melt phase mainly containing antimony; under a temperature of 923-1173K, a gas phase oxidant is introduced into the reaction furnace to selectively oxidize arsenic to form volatile arsenic oxide and volatilize from the melt to obtain arsenic containing flue gas, and antimony remains in metallic state and is enriched in the melt phase to obtain antimony enrichment melt after arsenic removal; the arsenic containing flue gas is cooled to a temperature below 473K through heat exchange, and condensed dust or particulate matter is collected through a dust removal device to obtain an arsenic oxide enrichment phase; the introduction of the gas phase oxidant into the reaction furnace is stopped and a protective gas is introduced for purging, and the antimony enrichment melt after arsenic removal is cast to obtain antimony product. The present application has the advantages of short process, low reagent consumption, low energy consumption, controllable arsenic form, high grade antimony product and suitability for industrial continuous production, etc.

The application discloses a method for recovering valuable metals tungsten and tin from hazardous waste tungsten slag, and aims at solving the problems that the existing method for recovering valuable metals from the tungsten slag needs a high temperature and the recovery rate of the valuable metals tungsten and tin needs to be improved. The recovery method comprises the following steps: S1, stirring and uniformly mixing tungsten slag powder with a reducing agent and a sulfidizing agent A; S2, placing the slag agent mixture of S1 in a tube furnace to perform high-temperature reduction treatment; S3, performing slag sulfuric acid leaching treatment; S4, repeatedly performing the high-temperature reduction treatment and the sulfuric acid leaching treatment for multiple times by taking the acid leaching slag as a sulfidizing agent B; and S5, stirring the tungsten-enriched sulfidized slag with sodium hydroxide and then roasting, obtaining a sodium tungstate solution through water leaching of the product, and finally evaporating and crystallizing. The valuable metal tin in the hazardous waste tungsten slag is extracted through high-temperature sulfidizing reduction. In the sulfidizing reduction reaction, tin is recovered, lead and arsenic oxides are oxidized to form sulfides, and the sulfides are separated from scheelite slag and enter the flue dust, and iron and manganese oxides are subjected to sulfidizing reduction reaction to enter the slag system, so that the hazardous waste is harmlessly treated.

The invention discloses an arsenic in-situ growth-metal organic framework material which is arsenic oxide nanoparticles formed in situ on the surface of a metal organic framework material by performing ligand exchange on an arsenic compound and the metal organic framework material, the arsenic compound is selected from sodium arsenite, disodium arsenate heptahydrate, arsenic trioxide and the like; the metal organic framework material is selected from ZIF-8 and the like. The invention also discloses bionic nano-particles for in-situ growth of arsenic. The bionic nano-particles are formed by coating an arsenic in-situ growth-metal organic framework material with a cell membrane. The invention further discloses application of the arsenic in-situ growth-metal organic framework material and the bionic nanoparticles in preparation of drugs for treating cancers. The arsenic in-situ growth-metal organic framework material disclosed by the invention is bionic nano-enzyme with enzyme-like activity and dual epigenetic regulation and control effects, and is uniform in morphology and relatively small in particle size; and due to cell membrane coating, the bone marrow targeting property is realized, the problem of insufficient targeting property of an arsenic compound is solved, and the tumor immunotherapy effect is enhanced.

The invention provides a waste iron scrap reduction-low-temperature arsenic fixation and copper removal method which can comprise the following steps: drying and sieving arsenic-containing anode slime to obtain anode slime powder; the anode slime powder and the scrap iron are mixed and subjected to reactive smelting in the inert atmosphere at the temperature of 500-600 DEG C till the reaction is finished, a reduction smelting product is obtained, and the reduction smelting product is composed of a slag layer containing elemental copper and a metal layer containing elemental arsenic; and the metal layer is subjected to vacuum distillation, and metal contained in the arsenic-containing anode slime is recycled. According to the method disclosed by the invention, highly toxic and volatile arsenic oxide is reduced and elemental arsenic is fixed at low temperature by utilizing the scrap iron, so that secondary pollution of arsenic is avoided from the source, and harmless treatment is realized.