18results about "Arsenic compounds" patented technology

The application provides a preparation method and device of high-purity zinc arsenide by multiphase reduction-melt alloying, and belongs to the technical field of inorganic compound synthesis. The method uses arsenic trichloride as an arsenic source, volatilizes the arsenic trichloride by precise temperature control, and transports AsCl3 vapor to a reactor containing high-purity liquid zinc by using high-purity inert gas as a carrier gas; at a set reaction temperature, the liquid zinc reduces the AsCl3 gas phase to generate elemental arsenic, and the elemental arsenic immediately reacts with zinc to generate zinc arsenide Zn3As2 in situ; the by-product zinc chloride ZnCl2 escapes in a gaseous form and is collected by a condensation system, and the zinc arsenide is suspended on the surface of the zinc melt due to the lower density than the liquid zinc, so that continuous or batch separation and collection can be realized. The application has the advantages of simple process, high reaction efficiency and high product purity, avoids problems such as uneven components and introduction of impurities in the traditional solid-phase reaction method, and is suitable for large-scale production of semiconductor-grade zinc arsenide materials.

The invention relates to the technical field of wet-process phosphoric acid purification, and discloses a method for separating and utilizing arsenic in wet-process phosphoric acid, which comprises the following steps of: clarifying wet-process phosphoric acid, and feeding supernate into an arsenic removal reaction tank; preparing an induced crystallization agent and a dearsenification agent, firstly adding the induced crystallization agent into the reaction tank, and then adding the dearsenification agent for reaction to obtain dearsenification phosphoric acid A; then heating and dissolving the phosphoric acid C, and cooling and growing crystals to obtain arsenic-removed phosphoric acid C; filtering to obtain arsenic-removed phosphoric acid and arsenic sulfide precipitate; washing and drying the precipitate to obtain an arsenic sulfide product; according to the method, the induced crystallization agent is combined with the dissolution-recrystallization process, so that separated arsenic sulfide is attached to the induced crystallization agent and grows into large-particle precipitates easy to filter, selective separation of arsenic is realized, and generation of arsenic-containing waste residues is avoided; and meanwhile, the separated arsenic is directly converted into a high-purity arsenic sulfide product, so that resource utilization of the arsenic is realized.

This invention relates to the field of lithium salt synthesis technology for lithium-ion battery electrolytes, specifically a method for synthesizing lithium hexafluoroarsenate. This method uses 40% hydrofluoric acid as the reaction medium, replacing high-cost anhydrous hydrofluoric acid, and adds 0.5-5 wt% fluoride catalyst. It employs a segmented temperature control mode of mixing at -40 to -30°C, aeration at 20 to 30°C, and heat preservation at 40 to 50°C. Combined with a reactor with a built-in annular baffle plate to improve mixing efficiency, the highly toxic exhaust gas is treated by a three-stage tail gas absorption system of anhydrous calcium chloride-20% sodium hydroxide solution-activated carbon. Simultaneously, it achieves resource recovery of fluoride-containing wastewater through lime slurry pretreatment-sulfuric acid regeneration and hydrofluoric acid recycling. This invention features a safe process operation, reduces costs by more than 30%, produces a product purity ≥99.9%, a yield ≥92%, achieves a fluoride resource recovery rate of ≥85% in wastewater, and meets national standards for tail gas emissions. It realizes efficient and green synthesis of lithium hexafluoroarsenate and is suitable for industrial production.

The invention relates to a gradient treatment and multi-metal collaborative recovery process for micro-fine particle coated sulfur concentrate. The gradient treatment and multi-metal collaborative recovery process comprises the following steps: (1) carrying out acidic complexing reinforced desilicication pretreatment; (2) two-stage temperature-controlled and atmosphere-controlled roasting: vulcanizing and volatilizing in a first-stage low-temperature reducing atmosphere to remove arsenic, and pore-forming and desulfurizing in a second-stage medium-temperature oxidizing atmosphere; (3) selectively extracting copper by reducing ammonia leaching; and (4) gold and silver are leached in a non-cyanide mode. According to the cascade treatment and multi-metal collaborative recovery process, a complete technical chain from'blocking secondary wrapping from the source 'to'recycling arsenic and sulfur in the process' to'multi-metal cascade recovery 'is constructed, the gold recovery rate and the silver recovery rate are stabilized to be 90% or above and 80% or above respectively, the copper recovery rate reaches 88% or above, and the iron ore concentrate grade is gt; arsenic is smaller than or equal to 0.10%, sulfur is smaller than or equal to 1.0%, and the resource recovery rate gt of arsenic and sulfur is achieved; the comprehensive utilization rate of resources is increased by more than 35%, and comprehensive breakthrough in four dimensions of recovery rate of valuable elements in the sulfur concentrate difficult to treat, product quality, environmental protection benefit and economical efficiency is realized.

The utility model relates to the technical field of high-purity arsenic preparation, and provides a high-purity arsenic sublimation device which comprises a sublimation barrel, a barrel cover, a crucible, a collecting cover and a negative pressure machine, the crucible is arranged at the inner bottom of the sublimation barrel, and a heating sleeve is arranged on the outer wall of the crucible; a threaded bottom is arranged on the lower wall of the barrel cover, a sealing brim is fixedly connected to the outer wall of the sublimation barrel, and the threaded bottom is in threaded connection to the inner wall of the sealing brim; a mounting table is arranged on the inner wall of the sublimation barrel, the collecting cover is arranged above the mounting table, and a spiral pipeline is arranged in the collecting cover. By arranging the collecting cover and the conveying pipe, when arsenic is sublimated, sublimated impurities can be discharged firstly, the phenomenon that when arsenic steam is condensed, the impurities and the arsenic steam are condensed at the same time due to the fact that too many impurities are contained in the barrel, and the purity is reduced is avoided, the crucible is directly heated by the heating sleeve through the semi-embedded arrangement of the communicating pipe crucible, and therefore the purity of the arsenic is improved. And the influence on equipment is avoided.

The utility model relates to a kind of dechlorination device for high-purity arsenic production, including main body mechanism, adsorption mechanism, heat dissipation mechanism, material receiving mechanism, the adsorption mechanism is located inside main body mechanism, the heat dissipation mechanism is located main body mechanism side, the material receiving mechanism is located main body mechanism side, the utility model passes through feed pipe and adds chlorine-containing impurity arsenic raw material to adsorption tank by motor driving heating disc rotation uses centrifugal force and evenly disperses to heating disc on raw material, raw material is heated to 620 DEG C to 650 DEG C by heating disc, ensure that chlorine-containing impurity arsenic raw material completely sublimes, avoid liquid residue, after sublimation, arsenic steam is adsorbed in raw material by five layer MOFs adsorption layer in adsorption tank, after adsorption, arsenic steam is entered into material receiving tank by steam pipeline, while steam pipeline is equipped with condenser pipeline, and arsenic steam is cooled, temperature 100 DEG C to 150 DEG C is condensed as solid high-purity arsenic.

This invention discloses a method for the harmless resource utilization of zinc oxide leaching residue. First, the zinc oxide leaching residue undergoes low-temperature arsenic removal to obtain white arsenic and arsenic-removed leaching residue. Then, the arsenic-removed leaching residue is subjected to low-acid washing to remove cadmium, yielding a cadmium solution and cadmium-removed leaching residue. The cadmium solution is then subjected to a zinc powder displacement reaction to obtain sponge cadmium. The cadmium-removed leaching residue is subjected to sulfidation-grinding treatment for extraction of valuable components (zinc and lead). Chemical flotation yields lead-zinc concentrate (containing arsenic and cadmium) and tailings (containing arsenic and cadmium). The lead-zinc concentrate and tailings are then subjected to low-temperature arsenic removal to obtain white arsenic, arsenic-removed lead-zinc concentrate, and arsenic-removed tailings. The arsenic-removed lead-zinc concentrate and tailings are then subjected to low-acid washing to remove cadmium, yielding a cadmium solution, cadmium-removed lead-zinc concentrate, and cadmium-removed tailings (harmless tailings). The cadmium solution is then subjected to a zinc powder displacement reaction to obtain sponge cadmium. Ultimately, this method achieves effective lead and zinc recovery and harmless tailings disposal.

The invention belongs to the technical field of metallurgy, and discloses a method for efficiently recovering multiple elements in smelting smoke dust. The method comprises the following steps that S1, smoke dust is leached through sulfuric acid and hydrogen peroxide, zinc, copper and arsenic enter a solution, and lead, gold and silver are left in slag; s2, activated arsenic sulfide is added into the pickle liquor, copper is selectively precipitated to obtain copper sulfide slag, and meanwhile arsenic is further enriched in the solution to obtain arsenic-rich liquor; and S3, the acid leaching residues, the copper sulfide residues and the arsenic-rich liquid are treated correspondingly, and lead, gold, silver, copper, arsenic trioxide and zinc sulfate are recycled. According to the method, efficient separation and full-quantification recovery of multiple metals are achieved, especially harmful arsenic is converted into valuable products, the technological process is clean and environmentally friendly, the resource utilization rate is high, and economic benefits and environmental benefits are remarkable.

According to the technical scheme, the high-purity arsenic synthesis device comprises a temperature rising box, a synthesis tank and a heating box, the synthesis tank is installed at the top in the temperature rising box, an oil storage chamber is arranged on one side in the heating box, a circulating pump is installed at the bottom in the heating box, and the input end of the circulating pump is connected to the interior of the oil storage chamber through an oil pumping pipe; an output shaft of the circulating pump is connected into the heating box through an oil inlet pipe, a backflow pipe is installed close to the top of the heating box, the tail end of the backflow pipe is connected to the top in the oil storage chamber, and a heater is installed at the bottom in the oil storage chamber. The high-purity arsenic synthesis device solves the problems that an existing heating structure of an arsenic synthesis raw material cannot uniformly heat the arsenic synthesis raw material, the heating uniformity of the arsenic synthesis raw material is poor, the reaction uniformity of the arsenic synthesis raw material is poor, and the synthesis purity of arsenic is affected, the reaction uniformity of the arsenic synthesis raw material is improved, and the yield of the arsenic synthesis raw material is improved. Therefore, the synthesis purity of arsenic is ensured.

This invention relates to the field of lithium salt synthesis technology, specifically to a green synthesis process and purification method for high-purity lithium hexafluoroarsenate. The invention uses low-toxicity lithium arsenate as the arsenic source and employs a dual-functional system of a composite reducing agent and fluorine source to achieve in-situ reduction and coordination synthesis simultaneously. It also utilizes directional coordination-impurity masking coupling technology to control impurity generation at the source. After pre-purification, the synthesis solution undergoes a supercritical CO2 extraction-membrane separation coupling purification process, combined with low-temperature gradient crystallization to obtain high-purity lithium hexafluoroarsenate product. This invention avoids the generation of highly toxic intermediate products throughout the process, has a short process route, mild reaction conditions, closed-loop recovery of raw materials and solvents, low emissions of waste, and high product purity. The content of moisture, free acid, and metal impurities is far below battery-grade standards, making it suitable for large-scale industrial production.

This invention relates to a new composition A composition having a general formula Li[6(1-x)] / xM(1-x) / xTiS(5-3x) / x X(1-x) / x, wherein 0 < x < 1.0, M is one or a combination of elements selected from the group of P, Sb, Sn, As, Nb, and V, and wherein X is an element selected from F, Cl, Br, and I, which can be used as a novel "diffusion-dependent" electrode; to a method for preparing such composition, to the use of this composition for preparing a positive or a negative electrode active material; to a positive electrode active material or to a negative electrode active material for solid state batteries obtained by using the new composition and to a battery comprising the said electrode active material.

The invention provides an InAs nano-material and a preparation method of a photovoltaic solar cell made of the InAs nano-material. High-performance nanometer materials such as InAs quantum dots and nanorods are prepared through the arsenic precursor which is low in price, easy to obtain, green and safe. The preparation process disclosed by the invention has the advantages of mild reaction conditions, simplicity and convenience in operation, good repeatability, low cost and the like; and the obtained InAs nano material has the characteristics of adjustable morphology, adjustable size, adjustable optical band gap and the like. The invention further provides a preparation method of a photovoltaic solar cell based on the InAs nano material, and the performance of a photoelectric device can be remarkably improved.

This invention discloses a method for treating and reusing arsenic sulfide slag, belonging to the field of arsenic sulfide slag resource recovery technology. This method separates arsenic and metal elements from arsenic sulfide slag in one step by adding sodium hydroxide, and simultaneously converts arsenic and some sulfur into arsenic trioxide and elemental sulfur by adding oxygen and sulfur dioxide. This invention effectively separates and recovers valuable metals, sulfur, and arsenic from arsenic sulfide slag through a wet process, converting them into economically valuable industrial raw materials. It reduces the loss of valuable metals, avoids environmental risks caused by the leakage of toxic substances, and has a relatively simple process flow, combining environmental and economic benefits.

This utility model relates to the field of wet arsenic production technology, and specifically discloses a composite reduction reaction tank for wet arsenic production, including a composite mist eliminator, a reaction tank, an air inlet pipe assembly, and a control unit. The composite mist eliminator is made of fiberglass and is installed on the reaction tank. The air inlet pipe assembly passes through the side wall of the reaction tank and is connected to it. The control unit is used to control the air intake volume, liquid level, and negative pressure of the reaction tank. The control unit is installed on the composite mist eliminator, the reaction tank, and the air inlet pipe assembly. The composite mist eliminator includes an air extraction port, a liquid inlet pipe, a nozzle, a wire mesh, an inclined plate, and a mist eliminator body. The wire mesh is made of stainless steel. The air extraction port is installed on the top of the mist eliminator body. This device can effectively solve the problem of foam entering the air extraction pipe, and uses the original liquid during each cycle of liquid injection to wash the composite mist eliminator, achieving the purpose of self-cleaning and fundamentally solving the existing problems.

Disclosed are a sulfide solid electrolyte and a preparation method and an application thereof. The sulfide solid electrolyte has a molecular formula of LiaP1-bMbScOdXe; wherein: 5<a<6; 0<b<1; 1.5<c<5, 0<d<2.5, 4<c+d<5, 1<e<2; M is selected from one or more of Al, Ga, In, Ti, Sc, As, Sb, Bi, V or Nb; X is selected from one or more of Cl, Br or I. Through the sulfide solid electrolyte and the preparation method and the application thereof provided by the present disclosure, it is possible to enhance the air stability and chemical stability of the sulfide solid electrolyte, increase the conductivity of the sulfide solid electrolyte, improve the air stability, and ameliorate the electrolyte / active material interface properties, thereby improving the compatibility with active materials, reducing packaging steps and the use of packaging materials, and thus significantly improving the capacity, number of cycles and energy density of lithium-ion batteries.

A sulfide solid electrolyte, a method of preparing the same, and an application are provided. The sulfide solid electrolyte has a molecular formula of LiaP1-bMbScOdXe, where 5<a<6, 0<b<1, 1.5<c<5, 0<d<2.5, 4<c+d<5, 1<e<2, M is selected from one or more of Al, Ga, In, Ti, Sc, As, Sb, Bi, V, or Nb, and X is selected from one or more of Cl, Br, or I. Through the sulfide solid electrolyte, the method of preparing the same, and the application provided by the disclosure, the stability of ionic conductivity of the sulfide solid electrolyte is increased, the air stability is enhanced, and the electrolyte / active material interface properties are improved, so that the service life and safety of an all-solid-state lithium-ion battery are increased.

The present invention provides a method for producing a III-V nanocrystal composition, the method comprising: forming a first mixture containing a first indium-containing compound and / or a first gallium-containing compound, a first ligand, and a first solvent; adding at least one pnictogen-containing compound to the first mixture and heating the first mixture to a growth temperature in the range of 200° C. to 350° C.; and adding an oxide removal reagent and a composition containing III-V clusters to the first mixture at the growth temperature for a total growth time of at least 6 hours to obtain a III-V nanocrystal composition. The present invention also provides cuboctahedral III-V nanocrystals that can be formed by the method of the present invention.

A low-cost concentration and stepwise extraction and utilization process for valuable components of coal mine water is disclosed. This process employs pretreatment of mine water using drift flotation and flocculation sedimentation to remove impurities. Through oblique light correction to enhance solar radiation energy, film overflow heating of the mine water, flash distillation of hot mine water, and condensation collection, the mine water is concentrated at low cost within a solar distillation device. Metal and heavy metal components are extracted from the mine water through solid-phase and liquid-phase chemical conversions and utilized as resources. Highly toxic chromium and radioactive uranium are captured from the mine water using an adsorption + reduction method. Arsenic compounds are adsorbed using a loaded fluoride ion adsorbent. This process achieves low-energy consumption, resource recovery, and harmlessness in mine water treatment, enabling clean and circular utilization of the mine water. It represents a technology for fundamentally controlling mine wastewater pollution.