127 results about "Arsenic acid" patented technology

The invention relates to a method for treating arsenic-containing wastewater by a process of preoxidation-composite coagulation deposition-filtering, and belongs to the technical field of wastewater treatment. The method comprises the steps of adding a certain amount of an oxidizing agent in a reaction tank for preoxidation in a condition that the wastewater contains trivalent arsenic so as to transform the trivalent arsenic into pentavalent arsenic completely, while for the wastewater only contains the pentavalent arsenic, the preoxidation process is not needed; adding a certain amount of a ferrous salt water solution; controlling a molar ration of Fe to As being 5-50; adding acid or alkali to adjust a pH value being 6-8; stirring for 0.1-1 min rapidly, so that a ferric arsenate precipitate is formed, at the same time, the ferrous salt is hydrolyzed into ferrous carbonyl to promote coagulation deposition of the ferric arsenate; adding a solution of 0.1-10 mg/L organic polymer flocculant; stirring for 0.1-1 min rapidly; stirring for 5-10 min slowly, precipitating for 10-30 min, discharging sludge from the bottom, introducing supernatant into a sand filter tank, a filter film or a filter bag, filtering and discharging the effluent. Arsenic content in water after treatment is lower than that of a drinking water standard (less than 10 [mu]g/L) regulated by the world health organization. The method has low sludge production and low cost, and can be used for advanced treatment of the arsenic-containing industrial wastewater and treatment of arsenic polluted underground water and drinking water.

The invention provides a method for preparing arsenic trioxide from arsenic sulfide waste. The arsenic sulfide waste is soaked in a sodium hydroxide solution to extract arsenic sulfide, arsenic sulfide mixes with an excessive amount of arsenic acid, and the mixture reacts at a temperature ranging from 40 DEG C to 95 DEG C for 0.5 to 3 hours, to produce a mixture containing arsenous acid and elemental sulfur; the mixture containing arsenous acid and elemental sulfur mixes with 2 to 5 times (by mass) of water and then oxygen gas is introduced so that arsenous acid is oxidized into arsenic acid, and the reaction product is filtered to remove elemental sulfur and thus to produce an arsenic acid solution; and the arsenic acid solution is reduced by sulfur dioxide gas to arsenous acid with a lower solubility, the reaction liquid is distilled under a reduced pressure to produce a saturated solution of arsenous acid, the saturated solution of arsenous acid is cooled so that arsenous acid is crystallized and then filtered to produce a filter cake of arsenous acid, and the filter cake of arsenous acid is dried and pulverized to obtain an arsenic trioxide product. The method has a short process flow, increases the recovery rate of arsenic, avoids the production of secondary pollutants, adopts simple equipment, greatly reduces the cost of arsenic recovery and is worthy to be widely applied.

The invention relates to a non-ferrous metal smelting high-arsenic contaminated acid arsenic fixing process which sequentially includes the steps: pre-neutralization, to be specific, mixing iron-containing slag or iron-containing reagents and smelting contaminated acid, controlling Fe/As molar mole ratio, throwing mixed slurry and the contaminated acid into a pre-neutralization tank, performing reaction, controlling the pH (potential of hydrogen) value of solution, thickening pre-neutralization slag slurry to obtain bottom flow, supernate and gypsum slag, and using the gypsum slag as a cementretarder for sales; oxidation, to be specific, supplementing iron sulfate serving as an iron source reagent as required, heating the pre-neutralized supernate, adding hydrogen peroxide serving as an oxidizing agent for oxidation, controlling oxidation-reduction potential, and completely oxidizing trivalent arsenic into pentavalent arsenic; crystal form iron arsenate precipitation arsenic fixing, to be specific, controlling reaction temperature, adding seed crystals, controlling reaction endpoint pH values by adding lime milk, and conveying bottom flow subjected to two-stage arsenic precipitating reaction to a landfill through filter-pressed crystal form iron arsenate solids. The arsenic fixing process has the advantages of simple process, low cost, good treatment effects, low environmentalpollution risk and the like and is applicable to non-ferrous metal metallurgy industries.

The invention discloses a method for preparing a quaternary ammonium salt cationic absorbing agent by using manioc straw/ manioc waste. The method comprises that ground manioc straw and manioc waste are preprocessed by using alkali, N,N-dimethylformamide serves as a reaction medium, quadrol serves as a cross-linking agent, the manioc straw, the manioc waste and epichlorohydrin are subjected to reaction, cellulose ester is generated, the reaction activity is improved, the the manioc straw, the manioc waste and the quadrol are subjected to reaction, a quaternary amine group is introduced, and an cationic ion exchanger is prepared. Under conditions of a room temperature and oscillation, the pH value of waste water is adjusted to be no more than 12, the cationic absorbing agent is added, the solid-to-liquid ratio of the absorbing agent and the waste water is no less than 1g/L, the oscillating time is no less than 30 min, filtering is conducted, and the cationic absorbing agent is separated. According to the method and application, source of raw materials is numerous, the cost is low, the process is simple, and the absorbing agent is economical and applicable, reproducible, high in weight gain and good in stability and absorbing effect and can be used widely in processing of waste water of water body eutrophication, anionic dye and negative ions such as arsenic acid radical, sulfate radical and Cr (VI).

The invention provides a treatment technology for high-arsenic acid industrial wastewater. The technology comprises steps as follows: Step 1: an iron-containing material is added to the arsenic-containing acid industrial wastewater, and amorphous ferric arsenate sediment and a clear liquid A are formed; Step 2: the amorphous ferric arsenate sediment obtained in Step 1 is placed in a reactor with an ultrasonic wave source, and a slurry material is converted into fine-grain scorodite under the action of ultrasonic waves; Step 3: the fine-grain scorodite and the clear liquid A are led into a reaction tank and stirred to have reaction equilibrium for 0.5-8 h, and coarse-grain-scorodite-containing sediment (for harmless stockpiling) and a clear liquid B are obtained; Step 4: a neutralizer is added to the clear liquid B, the pH is adjusted to be neutral, a clear liquid C is produced (for reuse/discharge), and neutralization sludge produced in a neutralization reaction returns to Step 3 for reaction equilibrium. According to the treatment technology, an ultrasonic wave technology is applied to the grain form transformation process, a precipitation technology is designed again, contaminated acid treatment energy consumption is obviously reduced, and the self-cleanliness of the treatment process is improved.

The invention discloses mercury ion test paper as well as a preparation method and a use method thereof. The test paper is prepared by immersing filter paper in an immersion solution, taking out and drying; the immersion solution comprises an immersion solution I prepared by dissolving 0.35-0.7 g of a cadmium reagent in 100 ml of absolute ethanol and uniformly mixing, and an immersion solution II prepared by dissolving 5 ml of arsenic acid in 20 ml of distilled water, adding 20 ml of a 40% sodium hydroxide solution and finally fixing the volume to 100 ml by the distilled water. The test paper is simple to prepare, low in cost, convenient to use, free from environmental pollution, favorable for environmental protection and wide in test range, does not need to be operated by professionals and is especially suitable for quickly detecting the mercury content on site.

The invention discloses a method for rapidly removing arsenic in high arsenic zinc oxide through zinc ash and sodium carbonate peroxide in iron and steel plants and producing zinc sulfate, which rapidly removes arsenic in high arsenic zinc oxide through zinc ash and sodium carbonate peroxide in iron and steel plants and simultaneously also produces zinc sulfate. By adopting the property that Fe(OH)3 can produce FeAsO4 with arsenic acid when the pH value of Fe(OH)3 is 3.0 to 5.4, iron in raw material is leached out, and Fe(OH)3 is produced through oxidation reaction and hydrolysis reaction, so that the purpose that arsenic is removed from solution is realized. The method comprises the concrete steps of calculating usage amount of high arsenic zinc oxide and zinc ash in iron and steel plants according to laboratory reports of arsenic, iron and zinc elements in the high arsenic zinc oxide and the zinc ash in iron and steel plants, mixing the raw material, slurrying, leaching, pH value adjusting, removing iron and arsenic trough sodium carbonate peroxide oxidation, neutralization, pressure filtration, purification, evaporative crystallization, and finally obtaining qualified zinc sulfate products. Arsenic is subjected to smelting waste solidification during the smelting process, so that hazard-free treatment is realized.

The invention provides a method for preparing arsenic trioxide by arsenic-containing waste water, which comprises the steps of: mixing arsenic sulfide waste residue with water, and extracting arsenic sulfide by sodium hydroxide solution; mixing the obtained arsenic sulfide with the water with 2-5 times of the weight of the arsenic sulfide to be sizing agent, and reacting with copper sulfate solution to obtain arsenous acid and copper sulphide-containing precipitate and sulfuric acid solution; mixing the arsenous acid and copper sulphide-containing precipitate with the water to feed the oxygen, oxygenizing arsenious acid to generate arsenic acid which is easy to dissolve in water, and filtering to obtain arsenic acid solution and copper sulphide precipitate; restoring the obtained arsenic acid to be arsenious acid by sulfur dioxide to obtain arsenious acid; and distilling the arsenious acid, concentrating, filtering and drying to obtain an arsenic trioxide product. The method is short in technological process, high in arsenic recovery rate, free of the generation of secondary pollutant, simple in equipment, and extremely lower in arsenic recovery cost, thereby being a method which is worth to popularize and apply.

The invention discloses a technology for efficiently and selectively separating zinc in zinc sulfide concentrate. The technology includes the steps that the zinc sulfide concentrate serves as a raw material and is wetly ground, then the wetly-ground concentrate and sulfuric acid or waste electrolyte are mixed into a slurry and poured into a high-pressure kettle for leaching, an adjusting agent A is added, pure oxygen is led in, the proper final acidity is controlled, and most Fe and most As in the zinc sulfide concentrate enter slag in the hematite mode, the iron vitriol mode and the ferric arsenate salt mode. Leached liquid is subjected to acidity regulation to be directly electrolyzed in a rotational flow mode, zinc in the leached liquid is extracted, and an electric zinc product meeting the national standard can be obtained. According to the technology, the traditional purification working procedure is omitted, the technological process and a device are simplified, the technology is simple, operation is easy and convenient, energy consumption is reduced, the leaching rate and the recovery rate of the zinc are increased, resources are saved accordingly, and cost is reduced.

The invention discloses a high-efficiency method for treating arsenic-containing wastewater, solves the problems in the prior art, and provides a complete method for treating the arsenic-containing wastewater. Arsenic (As3 plus) can be catalytically oxidized in advance through self-oxidation iron oxide flow bacilli; arsenious acid ions are oxidized to arsenic acid ions; then calcium compounds are added to gather arsenic-containing waste in the water; solid-liquid separation is conducted twice; and sludge can enter the wastewater again to circularly remove arsenic. After treatment, the arsenic content in the wastewater is very low, the discharged arsenic-containing sludge becomes non-toxic matters to be land-filled after being dried and roasted, and the water needing to be discharged can be discharged directly.

The invention discloses a stable arsenic acid iron slag solidifying method. The stable arsenic acid iron slag solidifying method comprises the steps that arsenic acid iron slag, an additive and a reducing agent are mixed evenly, geierite is obtained through forming and reduction, and stable solidifying treatment is completed. The method can be used for directly producing geierite, dissolution of arsenic in waste slag can be effectively prevented, bounce does not occur with time, the geierite obtained after stable solidifying is high in strength, large in specific gravity and good in hydrolytic resistance, can be used for balance weight, the environmental environment caused by arsenic-containing slag stockpiling is eliminated, and stable solidifying of arsenic slag is achieved.

The invention relates to a method for recycling arsenic in arsenic-containing material alkali leaching arsenic removal liquid and belongs to the technical fields of metallurgy and environmental protection. The method comprises the following steps: mixing arsenic-containing material alkali leaching arsenic removal liquid and benzyl chloride to perform arsenic reaction, allowing standing still for 30 minutes or longer after the reaction is completed, and performing liquid/liquid separation to obtain an intermediate product benzyl arsenate and a byproduct benzyl alcohol, wherein benzyl alcohol serves as a chemical raw material; adjusting the pH of the benzyl arsenate to 1 to 3 by using dilute sulfuric acid, separating out precipitate, performing liquid and solid separation to obtain a productbenzyl arsenic acid and filtrate, enabling the benzyl arsenic acid to be applied to mineral separation, neutralizing the filtrate and filtering to obtain neutralization residue and neutralization liquid, enabling the neutralization residue to be applied to manufacture a building material, and returning the neutralization liquid to leach the arsenic in the arsenic-containing material. According tothe method, the problems that by the conventional treatment technology of the arsenic-containing material alkali leaching arsenic removal liquid, arsenic pollution, arsenic harm and poor market are unavoidable are solved.

The invention relates to an electron transport material for organic electroluminescent devices and a preparation method of the electron transport material. The preparation method comprises the following steps of taking 4,7-dihalogen-1,10-phenanthroline as a starting material, and carrying out a Suzuki reaction on the starting material and arylboronic acid or arylboronate to obtain 4,7-diaryl-1,10-phenanthroline and derivates thereof as the electron transport material. The method provided by the invention has shorter synthetic route, simpler technology and higher reaction yield, obtains end-products with various types of different substituent groups, and has more easiness in material structure design and performance optimization in comparison with the conventional Skraup preparation method; meanwhile, no highly toxic materials such as arsenic acid and the like are in the reaction process, so that the reaction condition is milder, and the reaction process is safer and more environment-friendly. The preparation method provided by the invention is suitable for laboratorial preparation in gram scale and kilogram scale as well as industrial mass production in ton scale.

The invention discloses a method for quickly removing arsenic in zinc oxide with high arsenic content and producing zinc sulfate by using zinc ash and sodium peroxycarbonate of an iron and steel plant. The purpose of removing arsenic in liquor is realized by leaching iron in a raw material and then carrying out oxidizing and hydrolyzing reactions to generate Fe(OH)3 by means of a characteristic of Fe(OH)3 which is reacted with arsenic acid at the pH of 3.0-5.4 to generate FeAsO4 precipitates. The method specifically comprises the following steps: calculating the use levels of the two raw materials according to the laboratory reports of arsenic, ferrum and zinc elements in zinc oxide with high arsenic content and zinc ash of the iron and steel plant; proportioning the raw materials; pulpifying; leaching; adjusting the pH value; oxidizing to remove iron and arsenic by sodium peroxycarbonate; neutralizing; carrying out filter pressing; purifying; then, carrying out evaporative crystallization, thereby obtaining a qualified zinc sulfate product. Arsenic enters into smelting waste to be cured in the smelting process, so that harmless treatment is realized.

The invention discloses a production method for foamed aluminum. The method sequentially comprises the following steps of: feeding an aluminum ingot serving as a raw material into a foamed aluminum production line; placing the aluminum ingot into a heating crucible; heating and melting the aluminum ingot and pouring the molten aluminum ingot into a foaming box; adding a foaming agent into the foaming box for foaming; conveying the aluminum ingot out by using a conveyor belt after the foaming is finished; placing the foamed aluminum ingot on ground and naturally cooling the foamed aluminum ingot; cutting the cooled aluminum ingot into slices according to requirements of a customer; placing the sliced aluminum ingot on an oil press to compress by a certain height; cutting edges according to the specification of the customer; and packaging the aluminum slices to obtain the foamed aluminum. Because a porous structure is adopted, the foamed aluminum has semi-permanent sound-absorbing performance, is made of metallic material, fire-resistant completely and is completely free from hazard of noxious gases; the porous structure can effectively absorb energy and has a remarkable energy-absorbing effect in high-impact deformation rate; and the foamed aluminum does not have toxicity or smell or produce dust, peculiar smell or harmful substances to human body such as arsenic acid and the like and can be completely recycled and prepared from waste aluminum.

The invention discloses a black ferric arsenate crystal. The black ferric arsenate crystal is a micrometer petal-shaped particle, the particle size is 10 to 20mu m, and the appearance feature is black powder; a chemical formula of the black ferric arsenate crystal is Fe6(AsO4)5; diffraction peaks 2theta are equal to 13.9, 16.0, 21.2, 24.9, 25.2, 27.8, 28.4, 29.1, 30.5, 32.3, 34 and 34.2. The invention also discloses a synthesis method of the black ferric arsenate crystal. The synthesis method comprises the following steps of using ferric nitrate, sodium arsenate, nitric acid and deionized water to prepare a synthesis solution; mixing alcohol and the synthesis solution according to a volume ratio, so as to obtain a mixed solution; adding the mixed solution into a high-pressure reaction kettle to react for 8 to 24 hours at the temperature of 160 to 200 DEG C; after reacting, centrifuging, flushing solids by alcohol and water, and drying, so as to obtain the black ferric arsenate crystal. The synthesis method has the advantage that after the black ferric arsenate crystal is synthesized, the removal rates of Fe and As are respectively greater than 97%, so that the application potential in an As removal field is very large.

The invention relates to a method for recovering g tellurium from a low-concentration tellurium-containing liquid. The method comprises a mixing step and a settling step, wherein the mixing step comprises the processes of heating the tellurium-containing liquid, adding a ferric sulfate solution, stirring at constant temperature, adding an arsenic acid solution, stirring at constant temperature, adding a copper sulfate solution and stirring at constant temperature to obtain mixed liquor; the settling step comprises the processes of adding the obtained mixed liquor into dilute sulfuric acid to control the pH value, stirring at constant temperature, slowly adding a sodium sulfite settling agent, stirring at constant temperature and filtering to obtain a rich-tellurium product. According to the method, the treatment time is shortened, the equipment corrosion is reduced and the recovery rate is high.

The invention relates to a method for measuring the concentrations of four arsenic compounds in granulocytes by using an HPLC (High Performance Liquid Chromatography)-ICP (Inductively Coupled Plasma)-MS method and an application, and belongs to the technical field of blood sample detection. In order to solve the problem that the existing method cannot accurately measure the concentrations of fourdifferent arsenic compounds AsIII, AsV, DAV and MMVA in granulocytes, the invention provides a method for measuring the concentrations of four arsenic compounds in granulocytes by using the HPLC-ICP-MS method. The method comprises the steps of determining a detection condition, preparing a standard solution, drawing a standard curve, collecting and processing a granulocyte sample, performing sample detection and data processing. According to the method for measuring the concentrations of four arsenic compounds in granulocytes by using the HPLC-ICP-MS method and the application, each arsenic compound in granulocytes can be effectively extracted and accurately quantified. When the method is applied to the detection of the concentrations of four arsenic compounds in peripheral blood granulocytes of a patient suffering from APL (Acute Promyelocytic Leukemia, the metabolism and distribution characteristics of each arsenic form can be clarified, a technical basis is provided for revealing ofthe action mechanism of arsenic acid and reduction of toxic reactions, and when the method is used for assisting clinics, personalized medicine and targeted therapy are implemented.