248 results about "Toxic waste" patented technology

A dry powdered flowable cement composition contains calcium carbonate and a partially decarbonated magnesium carbonate. A slurry of the composition will set hard with various organic fillers including waste products and toxic waste. The composition can be slurried with contaminated water such as sea water, mineral laden ground water and muddy water. A high percentage of filler can be added while still having an acceptable set.

A system and method for tracking medical or toxic waste including a first container adapted to hold untreated medical waste, the container having a wireless tracking device attached thereto. The system also includes a tracking station capable of monitoring the movement of the medical waste by tracking the wireless tracking device.

The invention discloses a rice-seedling mechanical-transplanting and raising matrix, comprising the following components in parts by weight: 10-30 parts of fermentation straw coarse grains, 70-90 parts of non-toxic wastes in the fermentation industry and 0.1-2 parts of auxiliary materials, wherein the industrial non-toxic wastes are biogas residues generated in alcohol fermentation; the auxiliary materials are one or more of nutrient elements, a dwarfed strong seedling agent, a root growth promotion agent and a safety agent; and the nutrient elements are selected from one or more of nitrogen, phosphorus, potassium, zinc, boron and silicon. The rice-seedling mechanical transplanting and raising matrix disclosed by the invention has the advantages of easiness in obtaining materials, low production cost and good rice-seedling raising effect.

The present invention utilizes fungal spore mass or hyphal fragments in landscaping cloths, fiber substrates, paper products, hydroseeders and agricultural equipment. The fungi may include saprophytic fungi, including gourmet and medicinal mushrooms, mycorrhizal fungi, entomopathogenic fungi, parasitic fungi and fungi imperfecti. The fungi function as keystone species, delivering benefits to both the microsphere and biosphere. Such fungal delivery systems are useful for purposes including ecological rehabilitation and restoration, preservation and improvement of habitats, bioremediation of toxic wastes and polluted sites, filtration of agricultural, mine and urban runoff, improvement of agricultural yields and control of biological organisms. The invention allow for a variety of methods and products including the use of cardboard boxes as a delivery system for fungi with or without the combination with plant seeds for starting gardens, for controlling insects, or for the process of ecological recovery.

The invention provides a lignin-based activated carbon microsphere and a preparation method thereof. Wood powder and phenol are mixed and liquified under the condition that an acidic catalyst exists, then a stabilizer and a surfactant are added into the wood liquified matter to prepare a microsphere, then the microsphere is cured and carbonized, and the activated carbon microsphere is prepared. The prepared microsphere has the advantages of being uniform in surface, regular in shape, uniform in density during filling, large in internal pore number and the like, and can be used in the fields of adsorption materials and electrochemical materials. Wood serves as the raw material to prepare the lignin-based activated carbon microsphere, utilization additive value of wood is increased, and the problem that preparation of an activated carbon microsphere with phenolic resin as the raw material depends on fossil resources is reduced. In the curing process of the microsphere, formaldehyde does not need to be added, emission of toxic waste gas in the preparation process is reduced, and damage to human bodies and environment pollutions of harmful gas are avoided in the production process.

The present invention is foamed aluminum supported titania catalyst and its preparation process and application, and features that the catalyst has foamed aluminum carrier and nanometer titania or nanometer doped titania on the surface of the carrier. The catalyst has simple preparation process, facile material, excellent stability, high catalytic activity, convenient use and convenient reuse, and may be used widely in various photocatalytic fields for purifying air, purifying water, treating toxic waste water, purifying atmosphere, sterilizing, etc.

The invention relates to methods and apparatus for processing documents with medical and other waste. The method includes the steps of supplying the documents to an apparatus (1, 6) adapted to shred documents and medical waste, shredding the documents, and discharging the shredded documents from the apparatus (1). The apparatus (1) has little or no liquid effluent and little or no toxic air emissions. Also included is a system and method for tracking medical or toxic waste including a first container (13) adapted to hold untreated medical waste, the container having a wireless tracking device (170) attached thereto. The system also includes a tracking station capable of monitoring the movement of the medical waste by tracking the wireless tracking device (170).

The invention discloses an energy-saving device for producing oxyhydrogen combustion-supporting gas and a method thereof. The device is characterized in that: an electrolytic tank of the device comprises a plurality of negative electrode plates, positive electrode plates and neutral electrode plates; the different electrode plates do not mutually contact and are adjacently and alternately arranged to form an electrolytic electrode plate, and the two electrode plates positioned at the outermost of the electrolytic electrode plate are neutral electrode plates; an electronic drive unit in the device is an adjustable pulse-width modulator, an input terminal of the modulator is connected with DC power supply, and an output terminal of the modulator is respectively connected with the negative electrode plates and the positive electrode plates of the electrolytic tank. The method for producing the oxyhydrogen combustion-supporting gas by the device comprises the following steps: (1) supplying power to the adjustable pulse-width modulator; (2) adjusting the frequency and the duty ratio of the adjustable pulse-width modulator to cause the electrolytic tank to electrolyze out oxyhydrogen gas; and (3) outputting the oxyhydrogen gas without storage. The energy-saving device is safe, has convenient installation, can efficiently produce the oxyhydrogen gas, causes a combustion engine or an engine to obtain considerable and definite performance improvement, saves fuel and reduces the discharge of toxic waste gas.

Liquor compositions for the extraction of metallic elements from solid and liquid metal-contaminated starting material such as mineral ores, recyclable wastes, contaminated soils, engraving solutions, metal finishing solutions, battery manufacturing solutions, toxic wastes such as dusts producing through steelmaking processes by effectuating preferably prolonged contacting of such starting material with the liquor to cause the underlying structure of the starting material to be broken down. The contaminated starting materials are more susceptible to metal separation because the released metallic element are readily solubilized in the contacting liquor. Compositions of the contacting liquor comprise caustic silicate solutions containing essentially saturating levels of silica. Once the plurality of metallic elements contained in the starting material have been solubilized, they tend to remain in solution, and then may be routinely extracted and removed using conventional extraction methodologies such as precipitation of insoluble salts, electrowinning, or electrodeposition.

The invention provides a low heat composite cementing material, the raw materials of which comprise, by weight: 20-50 parts of cement, 40-70 part of fly ash, 5-25 parts of metakaolin, and 0-8 parts of an exciting agent. The cementing material is prepared by placing the above materials into a material mixer in order, and stirring them for 5-15m at a speed of 60-120 r/m under normal temperature and pressure. Application of the cementing material consists of the steps of: placing 88-97 parts by weight of the cementing material, 3-12 parts by weight of an expanding agent 1.0-1.5 parts by weight of a water reducer, and 24-32 parts by weight of tap water into a cement paste blender for blending based on the speed and procedure prescribed by the national building material industry standard JC/T729-2005: carrying out slow stirring for 117-123s at a rotation speed of 135-145 r/m and a revolution speed of 57-67 r/m, then stopping stirring for 14-16s, and then performing stirring again rapidly for 117-123s at a rotation speed of 275-295 r/m and a revolution speed of 115-135r/m for molding. The material provided in the invention is not only suitable to be used as a building material, and also can be used in backfill grouting, toxic waste curing and other special aspects.

The invention belongs to the technical field of coke oven gas purification, and in particular relates to the recovery process of coking crude benzene dispersing gas and a device thereof. The recovery process comprises the following steps: the dispersing gas in each storage tank in a crude benzene production area is intensively recovered through a pipeline and then introduced into a special washing tower; wash oil at the temperature of 25-28 DEG C is sprayed from the top of the washing tower so as to absorb benzene, naphthalene and other organic matters from the dispersing gas; the wash oil absorbing benzene, naphthalene and other organic matters flows automatically into the bottom of the tower and then enters a front pipe of a rich oil pump through a communicating pipe at the bottom of the tower to be mixed with rich oil; and finally the obtained mixed oil is treated in a debenzolization tower. The invention requires no operating cost, greatly reduces toxic waste gas generated in the existing coking crude benzene production area, and improves operating environment.

The invention relates to a gold extracting method by thiosulfate using a polyamine compound as an additive, which comprises the steps: after ores are crushed and wet-ground until the fineness is over 90 percent of -200 meshes, 0.03-3mol/dm3 thiosulfate is added to be used as a leaching agent, and then 0.0015-0.09mol/dm3 polyamine compound and 0.0015-0.03mol/dm3 copper (II) ion are added to form a complex ion to be used as an additive to be stirred and leached; and after gold ores are leached, gold from a leaching solution is recovered. The leaching solution is used to extract gold from the ores, so that the gold leaching rate is high, the process operation is simple, the control is easy, the consumption of thiosulfate is extremely low, and the compositions of the gold leaching solution are simple and are favorable for the recovery of the gold; and the application range is wide, the leaching effect is good when the pH value is between 10 and 12, the leaching speed is quick for copper-containing, carbon-containing and other refractory gold ores, quite high gold leaching rate can be maintained, and sodium cyanide and other toxic substances are not used and toxic waste is not discharged in the whole gold extraction process, so the environment is protected.

The invention provides a preparation dissolution method for intermediate salt during the process of acid leaching extraction of vanadium pentoxide from vanadium-containing stone coal clinker. The method comprises the following steps: the vanadium-containing stone coal clinker undergoes acid leaching, so as to obtain an acid leaching solution; ammonium sulfate is added into the acid leaching solution to separate out tschermigite, so as to obtain a vanadium-bearing mother liquor as a raw material; the vanadium-containing mother liquor and iron elementary substance are added into a reaction vessel, wherein the mass of the iron elementary substance is 1 to 60 percent of that of the vanadium pentoxide in the vanadium-containing mother liquor; the mixture is stirred for full reaction, and is heated, evaporated and concentrated until the concentration of H<+> in the solution is between 18 and 22 mol per liter; after complete crystallization, the solution is cooled to the room temperature, and filtrate and filter residue are obtained through filtration; and the filter residue is taken, and intermediate salt solid is obtained. The method has the advantages that the method is simple; the operating environment is good; the whole process undergoes full-liquid phase operation; no pollution of toxic waste gas exists; more than 98 percent of vanadium in the mother liquor is enriched into the intermediate salt, thereby greatly simplifying the subsequent extraction operation; and a residual acid after preparation of the intermediate salt can be recovered, thereby greatly reducing the cost.

The invention relates to a method for extracting gold from thiosulfate adopting ethanediamine as an additive. The method comprises the following steps that: the ethanediamineas is adopted as ligand and forms ethanediamine copper (II) complex ion with copper (II) ion, the formed ethanediamine copper (II) complex ion is used as the additive, and the thiosulfate is used as a leaching agent and is used for extracting the gold from ore pulp; and calculated by water amount, the adding amount of the thiosulfate is 0.03-3mol/dm<3>, the adding amount of the ethanediamine is 0.0015-0.09mol/dm<3>, and the adding amount of copper (II) ion is 0.0015-0.03mol/dm<3>. The leachate is used for extracting the gold from the ore, the leaching rate of the gold is high, the technique operation is simple, the control is easy, the consumption amount of the thiosulfate is extremely low, and the ingredients of the gold leachate are simple and are beneficial to recovery of the gold therein. The method has wide application range, has good leaching effect when the pH is between 10 and 12, also has fast leaching speed of gold ores which contain copper, carbon and the like and are difficult to treat, can maintain quite high gold leaching rate, and the whole gold extracting process does not use toxic substances of sodium cyanide and the like, also does not discharge toxic waste, and is environment-friendly.

The invention discloses a method for recycling polyvinylidene fluoride (PVDF), aluminum and cathode wastes (a mixture of active substances and conductive carbon powder) in waste battery cathode piecesof lithium ion batteries by virtue of a supercritical fluid extraction process. The method comprises the following steps: firstly disassembling cathodes of the lithium ion batteries, soaking in an organic solvent, taking out, carrying out drying treatment, and obtaining cathode pieces which do not contain electrolyte; then carrying out supercritical extraction treatment on the treated cathode pieces, namely dissolving a binder PVDF in the cathode pieces into a supercritical fluid, and extracting and separating the binder PVDF; mechanically separating remaining aluminum foils and the cathode wastes which lose cohesiveness and are mutually stripped; and directly taking the separated cathode wastes as a raw material for producing a lithium ion battery cathode material. The method disclosed by the invention does not use an acid-base fluid to treat electrodes or carry out high-temperature incineration, so that chemical waste liquor or toxic waste gas is not produced; and by virtue of the supercritical extraction treatment way, the recycled aluminum foils, PVDF and cathode wastes can be directly taken as the raw material to be recycled, so that the method has the advantages of economy,high efficiency and environmental friendliness.

The invention discloses a highly toxic waste water pre-treatment device and a use method thereof. The device comprises an active sludge adsorption unit and a coagulation absorption unit. In a use process, the active sludge adsorption unit removes COD (chemical oxygen demand) and partial heavy metal; the coagulation absorption unit removes most of the heavy metal. According to the practical use conditions, the installation and use sequence of the active sludge adsorption unit and the coagulation absorption unit can be freely arranged. The highly toxic waste water pre-treatment device disclosed by the invention has the advantages that heavy metal ions and the organic matter concentration of aromatic organic matters, phenol organic matters, ether organic matters and the like in industrial waste water can be greatly reduced; the total COD removal rate reaches 60 to 80 percent; the heavy metal removal rate reaches 80 percent; the beneficial conditions are provided for subsequent deep treatment of industrial waste water.

The invention discloses a method for preparing bamboo charcoal/carbon aerogel composite material, comprising the following steps: 1) mixing m-dihydroxybenzene with formaldehyde, dissolving in water, and stirring to obtain mixed liquid A; 2) adding the bamboo charcoal to the mixed liquid A and sealing; firstly standing at room temperature, then standing at 70-80 DEG C, and filtering to obtain mixture B; 3) putting the mixture B in trifluoroacetic acid liquor of which the mass concentration is 0.4-0.6% to soak, then taking outside and putting in acetone to soak, wherein the acetone is changed every day; and 4) putting the mixture after being dried in a nitrogen atmosphere furnace, insulating at 800-1000 DEG C for 1-3 hours, and obtaining the bamboo charcoal/carbon aerogel composite material. The composite material can be widely applied to industries for purifying air, processing waste water, processing toxic waste water, chemical catalyst carrier, purifying tail gas of cars, preparing sugar and wine, and preparing food.

A method for high-efficiently enriching gold and platinum metal from complex low-grade chlorine soaked slag relates to the key technology development field of high-efficient processing of low-grade assisted mineral resource and separation and extraction of scarce and precious metal. Complex low-grade chlorine soaked slag is subjected to the processes of slurry washing, first-stage normal-pressure leaching desulfurating, second-stage normal-pressure leaching desulfurating, pressure leaching, silicon-removing, and solid-liquid separating, while controlling appropriate technology parameters such as solid-liquid ratio, leaching reaction temperature, leaching time, acidity, addition amount of desulfurizer at the same time. Finally the silicon removed slag is high-grade, high-qualified precious metal concentrate. Compared to conventional methods, the method for high-efficiently enriching gold and platinum metal from complex low-grade chlorine soaked slag has the advantages of simple technology, environmental-friendliness, no generation of toxic waste gas or waste slag during production process, no use of toxic reagents, and high recovery rate and enrichment ratio of precious metals such as gold and palladium. The grade of enriched precious metals reaches 9000 to 15000 g/t, the recovery rate of precious metals reaches 98% or more, which is convenient for connecting the separation and refine processes of precious metals.

The invention relates to a combustion gas catalyst, a preparation method and application thereof, a catalytic burner and a preparation method thereof. The combustion gas catalyst comprises a carrier, a catalytic active component and a modifier, wherein the carrier is mainly prepared from Al2O3, and the catalytic active component consists of either or both of Pt and Pd. The combustion gas catalyst disclosed by the invention has the characteristics that the catalytic activity is high, the performance is stable, no naked fire exists during burning, the burning is sufficient, toxic waste gases are hardly produced, and the like, and the service life is long under the normal working temperature of 1,100 DEG C. The catalytic burner disclosed by the invention has very high infrared radiation efficiency, polluting gases of burnt gas are few, the cost is low, the burner is less prone to backfiring, and the use safety performance of combustion gas is high, so that the catalytic burner can be applied to the manufacture of gas stoves, gas water heaters, gas heaters, gas boilers or industrial gas drying equipment and the like.

The invention relates to an iron tailings based geopolymer porous material and a preparation method thereof. The preparation method includes, grinding and activating iron tailings, which serve as themain raw material, adding in a certain proportion of Kaolin to regulate components, uniformly mixing with sodium hydroxide and a sodium silicate composite alkali activator to obtain a mixture, injecting the mixture into a mold while sealing and curing, releasing, and maintaining on the condition with a certain temperature and humidity, so as to obtain a finished product. The geopolymer porous material has the special three-dimensional grid structure with high strength, large specific surface ratio, good corrosion resistance and long durability, and can be applied to the fields such as buildingmaterials, sealing of heavy-metal ion or toxic waste, porous adsorbent materials and the like. Raw materials are rich in sources and cost is low; the preparation method is simple, green and environmental friendly, realizes recycled comprehensive utilization of iron tailings, and has a great significance in sustainable development and energy conservation and emission reduction.

The invention discloses a method for surface modification of a carbon material. By adopting a safe, low-cost, non-toxic environment-friendly structure-directing agent and a one-pot hydrothermal method, functionalized radicals are simply and efficiently introduced into surfaces of carbon nanotubes and graphene so that the surface of the carbon material is significantly modified, the structure stability of the carbon material is maintained to the greatest extent, the dispersion of the carbon material in a solution is improved, the carbon material has good dispersing effect in the process that a dispersion liquid is maintained for a long time and thus the carbon nanotubes and graphene can be uniformly dispersed and stably exist in different matrix materials and the mechanical property, electrical conductivity and the like of a composite material can be significantly improved. Compared with the prior art, the method disclosed by the invention has the advantages that environmental friendliness is achieved, large-scale production can also be achieved and no highly toxic waste is produced and the method is simple, efficient and safe and, thus being a very promising and efficient modification method of carbon material.