183results about How to "Reduce arsenic levels" patented technology

The invention relates to a cellulose base/Fe3O4 composite adsorption material used for removing arsenic in water and a preparation method thereof. According to the invention, with fibers or powder of natural cellulose or fibers of a cellulose derivative as a cellulose matrix material for the composite adsorption material, in an alkaline water system provided by ammoniacal liquor, Fe3O4 particles are loaded on the surface of the cellulose matrix material through in-situ co-precipitation, and the loaded Fe3O4 particles enable the obtained cellulose base/Fe3O4 composite adsorption material to have magnetism and to be easily removed from water, and allow harmful ions like arsenate ions and arsenite ions in water to be absorbed. Compared to arsenic removal materials in the prior art, the invention has the following characteristics: a natural biomass is used as an adsorption carrier, and the natural biomass is cheap and highly efficient, enables the content of arsenic in water to be substantially lower than a national standard and is easy to remove and convenient to use.

The invention relates to a fertilizer capable of improve the tobacco soil and promote the growth of roots. The fertilizer comprises the following components by weight percent: 60-90% of humus type organic carrier, 4-10% of rooting powder or root growth promoter, 2-5% of plant growth hormone, 2-5% of potassium sulfate and 2-10% of secondary element/trace element fertilizer. By using the fertilizerof the invention, the soil can be improved, the soil organic matters can be increased, the soil organic and inorganic composites can be improved, the water-stable aggregate structure is easy to form,the supply of soil nutrients can be coordinated, the growth of plant roots can be promoted, the effectiveness of nutrients in soil can be increased, the potassium content of plant tissues can be increased, the organic matters of the tobacco soil can be increased, the effectiveness of nutrients in the tobacco soil can be increased, the growth of tobacco can be promoted, the potassium content of tobacco leaves can be increased, the quality of the flue-cured tobacco leaves can be improved, and the fragrance of tobacco leaves can be increased. By using a defined amount of the fertilizer of the invention, the absorption of the flue-cured tobacco to heavy metals such as arsenic can be reduced, the heavy metal enrichment factor of the flue-cured tobacco can be reduced and the contents of heavy metals such as arsenic in soot and smoke can also be reduced.

The invention discloses a method for preferably removing arsenic in lead and antimony smoke. The method comprises the following steps that firstly, sulphur and the lead and antimony smoke are mixed according to the mass ratio of 0.01-0.5:1, then the mixture is added into a sodium hydroxide solution to be leached, and meanwhile the temperature of the solution is kept within the range from 50 DEG C to 100 DEG C; secondly, liquid and solid separation is carried out on the solution leached in the first step, and a leaching agent and leaching residues are obtained; the leaching residues are washed, washing water obtained after washing is completed and the leaching agent are mixed and cooled to the room temperature, and filtering is carried out to obtain sodium arsenate crystal and crystalline liquid; and the crystalline liquid is used for leaching of the lead and antimony smoke in the first step. According to the technology method, the loss of valuable metal such as lead, antimony and zinc in the arsenic leaching and removing process is reduced through the adding of sulphur, meanwhile, the arsenic removing rate is increased, and selective removing of arsenic is achieved. The leaching rate of arsenic can reach 99% or more, and the content of arsenic in the leached residues can be reduced to 0.1% or lower.

The invention relates to a method for innocent treatment of low-concentration arsenic-containing waste residue and recovery of arsenic. Aiming at low-concentration arsenic-containing waste residue, according to the invention, a multistage alkaline leaching method is adopted, wherein mechanical stirring is performed for 10-12h in the environment of 60-80 DEG C, three-stage successive leaching is adopted, the arsenic leaching rate reaches more than 80%, the arsenic content of waste residue after treatment is less than 0.05%, which is lower than the hazardous waste identification limiting value, and therefore, the waste residue can be used as making material of building materials. As2O3 in an arsenic-containing alkaline leaching solution can be recovered by acid neutralization and sedimentation, and ferric sulfate is added to a leaching solution after filtering and sedimentation so as to produce FeAsO4.2H2O sedimentation, the comprehensive arsenic removing rate of the arsenic-containing alkaline leaching solution can reach 99%, and filter liquor can be recycled. Compared with the prior art, according to the invention, no wastewater discharge is caused in the whole process, the technology is simple, and the material is easily available, and the method can be widely popularized and applied to treatment and resource utilization of low-concentration arsenic-containing solid waste.

The invention relates to an in-situ arsenic removing method of underground water, which is characterized by comprising the following steps of: (1) arranging a pumping well in an earth surface area containing arsenic in the underground water, arranging a liquid-injection and gas-injection well around the pumping well, and arranging an aeration head of an aeration device at the bottom inside the liquid-injection and gas-injection well; (2) firstly completely pumping well water inside the pumping well and the liquid-injection and gas-injection well, then injecting a ferrous chloride solution into the liquid-injection and gas-injection well, and then injecting the water into the liquid-injection and gas-injection well till the water surface aligns to the ground, and starting to pump the water by the pumping well after the water is completely injected into the liquid-injection and gas-injection well; (3) alternately injecting the ferrous chloride solution and air; and (4) stopping injecting the ferrous chloride solution and the air when the content of the arsenic contained in the underground water pumped by the pumping well is stabilized at a value less than or equal to 10 micrograms/L and the content of chloride ions does not exceed the standard. The in-situ arsenic removing method of underground water has low cost and obviously reduced content of the arsenic contained in the processed underground water.

The invention discloses a preparation method of a soil remediation agent for remediating arsenic contaminated soil. Firstly, the selected wheat straws, teosinte and pennisetum hydridum are high in yield and low in price, and lots of plant fibers can be provided, so that soil nutrients can be effectively fixed; secondly, the wheat straws, teosinte and pennisetum hydridum are mixed with EM bacteriaand animal manure, and nutrients which are easily absorbed by plants are formed by adopting an anaerobic fermentation method, so that the yield of the crops can be greatly improved; and thirdly, zeolite, fly ash, coal cinder and kaolin are matched with one another, so that metal arsenic in the soil can be effectively adsorbed, and the effect of reducing the arsenic content in the soil is further achieved.

The invention belongs to the technical field of paddy field arsenic pollution treatment, and particularly discloses a rice cultivation water management method for a moderate and mild arsenic pollution paddy field. The water content of the arsenic pollution paddy field is reasonably adjusted by alternately performing waterflooding-moistening irrigation in the whole growth period of rice, the arsenic content of soil solution is remarkably reduced, and trivalent arsenic in soil can be transformed into low-toxicity pentavalent arsenic. By changing the form and the valent state of the arsenic in the soil, arsenic absorption and accumulation of the rice are reduced, so that the arsenic content of the rice is reduced. Measurement proves that the arsenic content of the rice cultivated by the method meets the pollutant limit standard (inorganic arsenic<0.2mg/kg, GB2726-2012) of national food.

The invention relates to a comprehensive utilization method of arsenic-containing materials. According to the method, production of comprehensive recovery of valuable metals such as arsenic, antimony, lead, bismuth and the like from smelting dust containing the arsenic, the antimony and the lead is performed, accumulation of the arsenic in the system is reduced, and harmless treatment is performed on the arsenic. With the method, through normal pressure alkaline leaching, soluble arsenic in the dust is removed, leaching residues are subjected to procedures of washing, reduction smelting, oxidizing blowing and the like, and various valuable elements are recycled. With the method, the arsenic is removed from the dust and enters a leaching solution, and impurities such as antimony, lead, tin and the like are separated out in the form of precipitates through purification and impurity removal of the leaching solution. A purified solution is used for arsenic salt purification of a zinc sulfate solution during zinc hydrometallurgy, and purification residues are sent for lead smelting, so that separation and harmless treatment of the arsenic and the valuable metals are realized. According to the method, the comprehensive utilization rate of resources is high, the raw material application range is wide, the problem of pollution in the extraction process of the traditional technology is solved, and the method has the more obvious advantages for the dust produced in the lead and zinc smelting process particularly.

The invention relates to a treatment method of arsenium-containing polluted acid wastewater generated by smelting flue gas, which comprises the following steps: pretreatment for sulfate removal; preneutralization; primary neutralization; secondary neutralization; tertiary neutralization; and circulating treatment. The pretreatment for sulfate removal, preneutralization and primary neutralization are sequentially operated to remove the sulfates and fluorine in the system in the precipitation form, wherein the removal rate is up to 95% or above, and the precipitate arsenium content is less than 0.1%. The secondary neutralization can enable more than 85% of the Cu, Fe, Pb, Zn and other metals to form a hydroxide precipitate, so that the high-content metals can be recycled. The tertiary neutralization can enable more than 95% of As to be enriched in the filter residue in the forms of calcium arsenate and calcium arsenite and to be recycled. The method can not generate unmanageable neutralization slag to form secondary pollution, and uses fewer reagents in the whole process; the calcium chloride only needs to be purchased at the time of starting; the operating process can be satisfied by circulation; and the method only consumes small amounts of lime and flocculant, is simple to operate, and has the advantages of low cost and favorable treatment effect.

The invention discloses a method for performing microwave arsenic removal on high-arsenic iron ore and belongs to the technical field of mineral separation. The method comprises the following steps: crushing the high-arsenic iron ore until the granularity is less than 1mm, adding a proper amount of pulverized coal, uniformly mixing, performing microwave roasting in an industrial microwave oven, controlling the temperature at 800-1200 DEG C, wherein the roasting time is 5-30 minutes, the arsenic is separated from the iron ore in a gas state form, low-arsenic iron ore concentrate which meets the industrial requirements is obtained, and the generated arsenic-containing tail gas is recycled by virtue of a flue gas absorption device arranged on the industrial microwave oven. According to the method, effective separation between the arsenic and the iron ore is promoted by utilizing selective heating of microwave on the iron ore, the arsenic removal rate is over 90 percent, and the method is a high-efficiency low-cost method for removing arsenic from the iron ore.

The invention discloses a high arsenicum gold ore roasting smoke gas treatment system and a method for recovering arsenicum and desulfurating, which can be used for mainly solving the problems that the arsenicum resource in the high arsenicum gold ore roasting smoke is wasted, and the environment is polluted by a large amount of hazardous wastes containing the arsenicum generated in wet processing. The high arsenicum gold ore roasting smoke gas treatment system comprises an arsenicum recovery system which comprises a settling chamber, a primary cyclone dust collector, a secondary cyclone dust collector, an electric dust collector, a water jacket cooler, a water circulating pump, a water circulating pond and a cloth bag arsenic collector. The high arsenicum gold ore roasting smoke gas treatment system provided by the invention also comprises a desulfurization system; and the method for recovering the arsenicum provided by the invention comprises the following steps of roasting smoke and dedusting, smoke drying cooling and arsenicum collecting by a cloth bag. The desulfurating method comprises the steps of rushing and washing. The invention has the advantages of being stable in process, high in arsonium recovery rate, high in product purity, low in gypsum arsenicum content and less in environmental pollution.

The invention relates to a method for enhancing oxidization leaching of low-valence arsenic existed as an alloy form of arsenic copper, arsenic cobalt and arsenic nickel in arsenic-cobalt-nickel containing slag by taking NaOH or KOH solution as a leaching medium and taking a copper oxide as an oxidizing agent. In the method, on one hand, an alkali medium is taken as the leaching medium, thereby the risk of generation of arsine gas with severe toxicity can be avoided during acid leaching; on the other hand, the copper oxide is taken as the oxidizing agent, by comparing with oxygen pressure leaching of the alkali medium, operation pressure of a system is reduced, copper in the copper oxide can not be dissolved in the alkali medium, and can follow with copper in the arsenic-cobalt-nickel containing slag into a copper smelting system. The method is the further improvement of a pressure oxidation leaching-out method for the alkali medium.

The invention discloses an arsenic-free glass bottle, which solves the problems that the conventional food packing glass is not favorable for human health and environmental protection and cannot reach state specified standards due to higher arsenic and antimony dissolution amount. The arsenic-free glass bottle is prepared from raw materials comprising the following components in part by weight: 51 to 63 parts of quartz sand, 3 to 9 parts of lithium (or sodium or potassium) feldspar, 12 to 19 parts of calcite, 0 to 20 parts of dolomite, 1 to 3 parts of calcium sulfate, 0 to 2.2 parts of fluorite, 0 to 3 parts of sodium fluosilicate, 15 to 21 parts of soda ash, 0.1 to 0.5 part of sodium sulfate, 0.3 to 1 part of calcium sulfate and 0.1 to 0.5 part of cerium oxide. The components are mixed uniformly, melted, molded and annealed to form the arsenic-free glass bottle according to the conventional glass bottle manufacturing method. The arsenic of the arsenic-free glass bottle is far below the state specified dissolution permissible amount, so the arsenic-free glass bottle has no toxic or side effect on the human body and does not produce environmental pollution; and at the same melting temperature, the clarifying time is shortened to half time of using arsenic and antimony oxides, and the production capacity is improved by 10 percent.

The invention discloses a method for planting Suaeda salsa on medium-low-arsenic saline and alkaline land and extracting plant salts. The method comprises the step of adsorption treatment on arsenic in soil. In the step of adsorption treatment on the arsenic in the soil, the arsenic is adsorbed by interplanting nephrolepis cordifolia (L.) presl and Chinese milk vetch, the interplanting proportion of the nephrolepis cordifolia (L.) presl to the Chinese milk vetch is preferably 4:2, and the planting density of the nephrolepis cordifolia (L.) presl and the Chinese milk vetch is preferably 20cm*20cm. According to the plant salts prepared by the method disclosed by the invention, the content of the arsenic is remarkably reduced, particularly the content of the arsenic is 0.001mg/kg; the content of sodium chloride is 35 percent, the content of potassium chloride is 13 percent, the content of Ca is 8 percent, and the content of Fe is 700mg/kg; the problem that the arsenic content in the plant salts extracted by using the Suaeda salsa planted on the medium-low-arsenic saline and alkaline land is over high is solved.

The invention provides a method for preparing an inhibitor for arsenic-containing ores. The method comprises the following steps of: according to the mass ratio of tannin to ethanol of 1-1.5:1.5-3, adding the tannin in a three-neck bottle, adding 95 percent ethanol in the three-neck bottle, placing the three-neck bottle in a thermostatic waterbath at the temperature of 45 DEG C, dispersing the mixing solution for 2 to 3h by stirring, adding 0.4 to 0.6 g/mL NaOH solution for alkalization according to the molar ratio of the NaOH to the hydroxyl group in the tannin of 1.5-3:1-1.5, heating the mixed solution up to the temperature of between 50 and 60 DEG C for full reaction for 1 to 2h, adding chloroactic acid in the three-neck bottle according to the molar ratio of the chloroactic acid to the hydroxyl group in the tannin of 2-3:1-6, heating the mixed solution up to the temperature of between 75 and 85 DEG C for reflux reaction for 4 to 6h, and drying the mixed solution by vaporization toobtain a solid product, namely the inhibitor for arsenic ores. The inhibitor provided by the invention can better inhibit the arsenic-containing ores during the antimony-arsenic separation, and lowerthe arsenic content in the antimony concentrate; moreover, the method also has the advantages of less consumption of the inhibitor, good solubility, no toxicity and no pollution.

The invention discloses an arsenic removing flotation method for high-arsenic-content sulfur concentrate, and belongs to the technical field of beneficiation. The arsenic removing flotation method comprises the steps that water and sodium carbonate are added into the high-arsenic-content sulfur concentrate for pulp mixing; ball milling is conducted on concentrate pulp; a rough flotation chemical agent is added into the milled concentrate pulp to be uniformly mixed, first-time rough flotation is conducted for 3-5 min, and rough flotation concentrate and rough flotation tailings are obtained; first-time concentration is conducted on the rough flotation concentrate for 2-4 min, and low-arsenic-content sulfur concentrate and first-time concentration tailings are obtained; a first-time scavenging flotation chemical agent is added into the rough flotation tailings to be uniformly mixed, first-time scavenging flotation is conducted for 3-5 min, and first-time scavenging flotation concentrateand first-time scavenging flotation tailings are obtained; the first-time scavenging flotation concentrate and the first-time concentration tailings are mixed, and first-time rough flotation is conducted; a second-time scavenging flotation chemical agent is added into the first-time scavenging flotation tailings to be uniformly mixed, second-time scavenging flotation is conducted for 2-4 min, andsecond-time scavenging flotation concentrate and second-time scavenging flotation tailings are obtained; and the second-time scavenging flotation concentrate is returned for first-time scavenging flotation. According to the method, the content of arsenic in the sulfur concentrate can be decreased, and resources such as arsenic and sulfur can be recycled.

The present invention discloses a kind gold extracting process from high arsenic gold ore. High arsenic gold ore is first high iron pre-treated to make As content lowered to below 8 %, reaching the requirement of bacteria oxidation to extracting gold, and then gold is extracted biologically. The present invention has simple and effective technological process, can oxidize toxic sand in raw ore in short time and has low apparatus investment.

The invention discloses a slow-release repairing agent for treating cadmium-arsenic combined pollution rice field soil and a preparation method thereof. The preparation method comprises the followingsteps: (1) fully and uniformly stirring calcium carbonate and calcium magnesium phosphate fertilizer and calcining under nitrogen protection, and obtaining a compound A after the calcined mixture is ground and smashed; (2) adding potassium silicate into water, fully stirring to dissolve potassium silicate, uniformly spraying the dissolved potassium silicate solution onto the surface of the iron powder, and then granulating on a granulator to obtain mixture granules B; (3) putting the compound A and the mixture granules B into the granulator, and gradually spraying pure water until the surfacelayers of the mixture granules B are uniformly coated with the compound A to form granules with the diameter of 3-5 mm; and (4) drying the particles obtained in the step (3) until the water content isless than or equal to 5% to obtain the slow-release repairing agent. The slow-release repairing agent can implement cadmium-arsenic synchronous passivation resistance control in the key growth periodof rice and is small in dosage and effectively reduces the cadmium-arsenic content of the rice and is remarkable and stable in effect.

The invention relates to the field of metallic ore, particularly to a separating method for antimony-gold-arsenic paragenetic ore. The separating method comprises S1, preparing the antimony-gold-arsenic paragenetic ore of a certain weight; S2, adding 1.5kg/t of Na2S, 2.5kg/t of Na2CO3, 120g/t of CuSO4, 120g/t of MA-2 and 15g/t of 2# oil to the antimony-gold-arsenic paragenetic ore ; S3, adding 0.3kg/t of Na2S, 0.5kg/t of Na2CO3, 20g/t of CuSO4 and 20g/t of MA-2 to the antimony-gold-arsenic paragenetic ore continuously and separating antimony concentrate; S4, adding 0.5kg/t of Na2S and 0.75kg/t of Na2CO3 to the antimony-gold-arsenic paragenetic ore continuously and separating gold-arsenic ore. According to the separating method, the antimony-arsenic separating process through a sodium carbonate-sodium sulfide method is adopted, selective flotation of arsenic is achieved at the utmost through antimony suppression and arsenic flotation, the recovery rate of arsenic in gold-arsenic concentrate is improved, and the content of arsenic in the antimony concentrate is reduced.

The invention discloses a continuous refinement system of ultra-pure phosphorus oxychloride of a 5N grade. The continuous refinement system comprises feeding storage tanks, wherein the feeding storage tanks are communicated with a middle raw-material tank; a discharge opening of the middle raw-material tank is connected with a feed opening of a rectification kettle and a shell-side feed opening of a first condenser respectively; a discharge opening in the top end of the rectification kettle is connected with a tube-side steam feed opening of the first condenser through a rectification tower; a shell-side discharge opening of the first condenser is connected with a feed opening of the middle raw-material tank; a tube-side condensate-liquid discharge opening of the first condenser is connected with a finished-product collecting unit; a tube-side light-component discharge opening of the first condenser is connected with a light-component treating unit; a kettle-bottom heavy-component discharge opening of the rectification kettle is connected with a waste-liquid treating unit; a jacket of the raw-material middle tank and a jacket of the rectification kettle are connected with a circular heating unit of heat conducting oil; a vacuum pump for evacuation is arranged in the light-component treating unit. The continuous refinement system is protected by nitrogen. The invention further discloses a continuous refinement technology. The continuous refinement technology is short in engineering, and the purity of obtained products is high.

The invention relates to the field of farmland soil remediation, in particular to a soil conditioner for treating farmland cadmium and arsenic combined pollution and an application method of the soil conditioner. The soil conditioner is prepared from the following components in percentage by mass: 50%-60% of modified charcoal, 10%-30% of reduced iron powder, 10%-30% of calcium magnesium phosphate fertilizer and 10%-30% of sepiolite. When the soil conditioner is applied, the soil conditioner is uniformly mixed with water through a stirring box to form slurry, then the slurry is sprayed into a rice field through slurry spraying equipment, and then the soil conditioner is fully mixed with soil through ploughing. The soil conditioner provided by the invention can effectively reduce the bioavailability of cadmium and arsenic in farmland soil, reduce the content of cadmium and arsenic in agricultural products produced in a cadmium and arsenic combined pollution farmland, and avoid secondary pollution in the use process.