290 results about "Heavy metal chelation" patented technology

The invention belongs to the technical field of heavy metal wastewater treatment, and in particular relates to cyanuric acid-based heavy metal chelating flocculant and a preparation method thereof. In the method, cyanuric acid is adopted as a basic framework; and polyamine is connected to a molecule through epoxy chloropropane, and reacts with carbon disulfide in an alkaline condition to prepare the heavy metal chelating flocculant of which the molecule contains a plurality of branches and a plurality of dithio formate functional groups. The method overcomes the defects that the conventional monofunctional flocculant has small flocculating body, and poor precipitation performance, and when polymeric chelant chelates heavy metals, steric clash is great, and the residual heavy metal ion concentration is difficult to meet the standard and the like. The flocculant has the advantages of simple preparation process, mild condition, easy operation and control, high yield, high raw material utilization, less three waste discharge and environmental protection of technical process, convenient popularization and industrialization realization and suitability for treatment of various types of heavy metal wastewater, such as smelting wastewater, electroplating wastewater, nonferrous metals processing wastewater, mining and beneficiating wastewater, printed circuit board wastewater, battery plants and the like.

The present invention relates to heavy metal chelate compositions, which are used as fungicides and bactericides, and methods of using the compositions. In particular, the present invention relates to a chelate, that is an EDDHA (copper-ethylenediamine-di-o-hydroxyphenylacetic acid), combined with a heavy metal, including iron, tin, zinc, manganese, copper, and combinations thereof.

The invention relates to the field of environmental protection and restoration and in particular relates to an environmental-friendly heavy metal stabilizer used for soil restoration of an industrial pollution site and an application method thereof. The environmental-friendly heavy metal stabilizer is prepared from the following material components in parts by weight: 40-50 parts of clay mineral, 17-24 parts of adsorbing material, 10-18 parts of heavy metal chelating agent, 4-8 parts of heavy metal precipitating agent and 10-15 parts of alkaline modifier. Main ingredients of the adopted stabilizer are natural materials, heavy metal pollutant in soil can be rapidly and effectively stabilized through composite action such as chelating, precipitation and adsorption; the heavy metal pollutant is stabilized for a long time, toxicity and biological availability of the heavy metal pollutant can be reduced, risk of the heavy metal polluted soil to the environment and human health is reduced, and the heavy metal polluted soil is restored; besides, a soil texture improving ingredient is contained, so that soil is restored while tillability of the soil is improved.

A stabilizer suitable for heavy metal contaminated soil and an application method thereof belong to the technical field of contaminated soil remediation treatment. The invention is characterized in that: the soil stabilizer comprises the following components by mass: 5%-8% of heavy metal chelants, 10%-20% of gelled materials, 50%-65% of clay mineral, 10%-15% of alkaline excitants; the gelled material, clay mineral and alkaline excitant are mixed and grinded to obtain a Blaine specific surface area of 5000-8000 cm2/g; the mixture is sieved by a 200-mesh sieve, and the water content is less than 3%; the heavy metal chelant is prepared into a solution by water with a mass percent of the chelant being 20%-40%. The stabilizer and soil are uniformly mixed, and conserved for above 5 days. The main components of the stabilizer are mostly natural materials; after the stabilizer is used, heavy metal contaminants in soil can be rapidly and effectively stabilized, and the toxicity of the contaminants is reduced. The materials used are economical and easily available, and do not cause secondary contamination, and the stabilizer is a rapid and high-efficient stabilizer for heavy metal contaminated soil.

The invention belongs to the technical field of removal, purification and entrapment of heavy metal ions in a water body, and in particular relates to an ethylenediamine-based heavy metal chelating agent and a preparation method thereof. The ethylenediamine-based heavy metal chelating agent is prepared by directly reacting ethylenediamine, carbon disulfide and solid alkali in absolute ethyl alcohol or a mixed solvent consisting of absolute ethyl alcohol and diethyl ether in a certain volume ratio. The method overcomes the defect of steric effect of polymer chains when the conventional polymeric chelating agent chelates the heavy metal ions, and also overcomes the defect that floccules have excessive negative charge to obstruct the further growth of the floccules because of mismatched space of chelation groups of small molecules with multiple functional groups. The product is solid powder, has high stability and is convenient to store and transport. The method has the advantages of simple synthetic process, mild reaction conditions, easy operation and control, high reaction speed, high efficiency, recyclable solvent, high utilization rate of raw materials, less discharge of three wastes, environmental-friendly technical process, conventional equipment and easy industrial production.

The invention discloses a heavy metal polluted sludge treatment method which comprises the following steps: conveying heavy metal polluted bottom sludge of rivers, lakes and reservoirs by a slurry pump of a sanddredger ashore; adding heavy metal chelate stabilizer in a first pipeline blender of dredging pipelines; and then adding flocculant in a second pipeline blender; and finally filling sludge in geotextile bags for volume reduction and dehydration; and concreting for 7-50 days after the sludge filling, wherein the sludge treated by the method can be used for land reclamation, greening or landfilling according to different water contents and heavy metal contents. Compared with the prior art, by environmental-protection dredging, transmission by closed pipelines and heavy metal stabilization, the invention completely solves the secondary solution problem of heavy metals; and the invention combines the heavy metal stabilization and a geotextile bag dehydration technology without power consumption without the input of mechanical dehydration equipment, and is suitable for heavy metal polluted sludge treatment in occasions of large treatment area, short work period, small dehydration site, less once investment, low operation cost and the like.

The invention relates to a method for preparing heavy metal chelating resin, in particular to a method for preparing silica gel supported dithiocarbamate heavy metal chelating resin and adsorption of heavy metals such as lead, cadmium, copper, mercury and the like by the resin. The method comprises the following steps of: reacting carbon disulfide with a polyamine compound to generate a dithiocarbamate compound; and grafting the dithiocarbamate compound onto the surface of silicon dioxide, wherein a halogen group is modified on the surface of the silicon dioxide. By the method, the adsorption capacity of dithiocarbamate chelating resin is effectively improved; and the problem that silica gel is dissolved due to too high alkalinity of a reaction system (pH value is more than 11), or the dithiocarbamate compound cannot be generated through reaction due to too low alkalinity (the pH value is less than 10) when a dithiocarbamate functional group is prepared by reacting the silica gel with the carbon disulfide in the conventional synthetic route is solved, wherein an amino group is modified on the surface of the silica gel.

The invention discloses a method for preparing a chelating fiber material capable of adsorbing heavy metals in water. According to the preparation process, only the surface layer of a finished fiber material is subjected to activating and grafting reaction in a low-temperature plasma field, the reaction is not carried out in the fiber material, and the treatment conditions are mild; and meanwhile, the fiber surface is multiple in active points, high in grafting rate and high in heavy metal chelating capacity, and the capacity is controllable. The method disclosed by the invention comprises the following steps: activating the melt-blown polypropylene fiber surface by using plasma, and generating lots of macromolecular radicals; allowing the macromolecular radicals to contact with air, so that the PP fiber surface is covered with organic peroxides or hydrogen peroxide; performing graft polymerization on the PP fiber surface by using a glycidyl methacrylate monomer; and finally, enabling an epoxy functional group on GMA to react with diethylenetriamine, thereby obtaining the chelating fiber material capable of adsorbing heavy metals in water.

The invention belongs to the field of environmental protection, and discloses a method for preparing foliage silicon fertilizer, namely a method for preparing high-concentration and high-purity nano silicon dioxide sol by using metasilicic acid as a raw material. The h-concentration and high-purity nano silicon dioxide sol is obtained by removing heavy metal and sodium ions harmful to crops from alkali and acid coarse silicon sol prepared from active silicon solution through a heavy metal chelating technique and a dialysis process. The heavy metal content of the silicon dioxide sol prepared by the method is greatly reduced, and the silicon dioxide sol has small salt-containing amount and remarkable inhibiting effect on heavy metal pollution to vegetables and rice; and the method has the advantages of convenient preparation process, low production cost, shorter production period, excellent product performance, small grain diameter, strong stability and easy storage and application.

The invention discloses a preparation method and application of a heavy metal chelating agent and belongs to the field of fly ash treatment. The chelating agent is prepared from dithiocarbamtes, weak acid salt, organic amine and water. The PH of a prepared chelating agent solution is smaller than 10.5, the chelating speed of the chelating agent solution and lead can be effectively increased, and the reaction speeds of the chelating agent solution and copper as well as the chelating agent solution and iron are properly decreased. Through the chelating agent, the influence of the high ammonia-nitrogen values of fly ash on the chelating capacity of the chelating agent can be effectively improved, and when the chelating agent is used in the sludge fly ash, the chelating capacity of the chelating agent is not lowered.

The invention discloses an organic polymer heavy metal chelating flocculant as well as a preparation method and an application thereof. The organic polymer heavy metal chelating flocculant is prepared from the following raw materials in parts by weight: 100 parts of carboxymethyl starch, 5-20 parts of a crosslinking agent, 0.05-0.5 part of an initiator, 5-20 parts of acrylamide and 28-60 parts of carbon disulfide, wherein the crosslinking agent is adipic acid, phosphorus oxychloride or sodium trimetaphosphate. The organic polymer heavy metal chelating flocculant has the efficacies of both excellent heavy metal chelating precipitation and flocculation, has the advantages of rapidness in reaction speed, ideal effect of removing heavy metal ions, high treatment efficiency and the like, is low in dosage and cost and is capable of economically and efficiently treating sewage containing the heavy metal ions.

An effervescent tablet for improving the immunizing effect of vaccine by dissolving it in drinking water contains water-soluble non-volatile weak solid acid and hydrogen carbonate salt, water-soluble solid auxiliary and color indicator and leavy metal chelating agent.

The invention relates to ecological environment pollution treatment and mechanical equipment in the engineering application fields thereof, in particular to vehicle-mounted in-situ remediation equipment for heavy metal pollution of farmland soil, which mainly comprises a vehicle-mounted system, a push bucket material taking system and a magnetic recovery system. a vehicle frame of the vehicle-mounted system is connected with a push bucket through a support rod, the middle part of the push bucket is provided with a material collecting port, and soil solution is extracted to a feeding port of the magnetic recovery system through a middle pipe by using a pipeline pump positioned in the push bucket material taking system; in the magnetic recovery system, a magnetic recovery machine is driven by a magnetic separation motor, magnetic heavy metal chelates in the soil solution are adsorbed on a magnetic roller, are scraped to a fine material groove by a scraper device, and drop to a recovery groove by a fine material pipe. The equipment can fill the technical equipment blank field of new chelating magnetic removal materials in engineering application, in particular to a soil solution system. And a mobile in-situ rapid remediation mode for soil heavy metal pollution treatment is achieved.

The invention relates to a heavy metal trapping agent in the field of environment protection. The heavy metal trapping agent is prepared from polymer containing a polyethylene diamine tetra-acetic acid unit, wherein by weight percentage, the content of the polyethylene diamine tetra-acetic acid unit is 45-100% of polymer; the polymer is homopolymer or copolymer; the polyethylene diamine tetra-acetic acid unit is a form of sodium salt, potassium salt or ammonium salt. The defect that a chelate compound of existing ethylenediamine tetra-acetic acid and the heavy metal is generally soluble is overcome, and the provided heavy metal trapping agent has strong heavy metal chelating power, and the solubility can be controlled by pH of the solution; moreover, the trapping agent is free of toxicity.

The invention provides a method used for preparing sludge active carbon by sludge and the sludge active carbon. According to the weight parts, 1,000,000 of sludge of a water disposal factory is mixed with 50-100 of flocculant and 2-10 of heavy metal chelating agent; the gained sludge complex is mixed in a mixing device, dehydrated and dried; the gained sludge complex is semi-dry-distillated in a semi-dry distilling gasification furnace and uniformly granulated by the weight ratio of sludge semi-coke, adhesive and hole-adjusting agent of 100:10-30:1-5, and shined under the sun; the gained complex is activated in an activation furnace, screened after the activation disposal and then prepared into powder to gain the sludge active carbon. The prepared sludge active carbon has rich large holes, middle holes and transition holes, outstanding adsorption balance capability and fast adsorption speed, is especially applied to sewage disposal, and can also be used for disposing wastewater, waste gas and improving the soil.

The invention discloses a glass fiber subjected to surface treatment and a preparation method thereof, and application of the glass fiber to cadmium ion detection and water treatment. The glass fiber is prepared from a common glass fiber serving as a raw material and the common glass fiber is treated by a silane coupling agent and a heavy metal chelant to form the glass fiber. The common glass fiber is treated by the silane coupling agent to ensure that chemical bonding is performed on the silane coupling agent and the surface of the common glass fiber; and the glass fiber treated by the silane coupling agent is treated by the heavy metal chelant to ensure that chemical reaction is performed on the heavy metal chelant and the silane coupling agent to realize bonding so as to form the glass fiber subjected to surface treatment. The preparation method of the glass fiber subjected to surface treatment has important application value in the field of detection and treatment of heavy-metal-containing wastewater, and particularly has the wide application prospect in the serious heavy metal pollution area.

The invention discloses a preparation method of fucosan. On the basis of the traditional preparation technology of the fucosan, HCl is adopted to adjust the pH value of solution, and metal chelating agent EDTA is added, so as to lead heavy metal ions originally chelated on the fucosan sulfate groups to shed off and form chelates with the EDTA. By adopting an ultrafiltration technology, the EDTA-heavy metal chelates are separated from the fucosan, and concentrated, and the fucosan after the removal of heavy metal elements can be prepared through freeze-drying. The preparation method has the advantages of simple operation, mild conditions, high shedding rate of heavy metal ions, low cost and the like, and is suitable for large-scale operations.

The invention belongs to the technical field of harmless treatment of municipal solid waste incineration fly ash, and solves the solidification problem of heavy metal ions in fly ash. A method for preparing a novel synthetic heavy metal chelating agent comprises the following steps: mixing a polyethyleneimine water solution with a sodium hydroxide water solution, and dropwise adding carbon disulfide to obtain an orange red jelly-like solid, namely the heavy metal chelating agent. The method is simple in process, low in cost, easy and convenient to operate, wide in application range, low in environmental pollution and suitable for industrialized production.

The invention provides heavy metal detection test paper, which is filter paper impregnated with color development reagent solution. The color development reagent solution comprises chlorine dioxide, a heavy metal chelating agent and a chlorine dioxide color development reagent in a molar ratio of 1-5:1:1-10. The invention also provides a preparation method and application of the test paper. The heavy metal detection test paper has the advantages of (1) simple production, low cost and low price; (2) high sensitivity and lowest detection line of 0.004mg/L; (3) simple and convenient use, high detection speed and wide application to rapid detection of total heavy metal content of food, a Chinese herbal extract, water or other fields; and (4) low interference and no influence of the pH value of a sample.

The invention relates to a preparation method of a heavy metal chelating adsorbent. A macromolecular organic heavy metal chelating adsorbent with good chemical stability is prepared by crosslinking and polymerizing four monomers including diethylenetriamine, carbon disulfide, sodium hydroxide and epoxy chloropropane under a certain conditions. The heavy metal chelating adsorbent has good selectivity, adsorption performance and renewable performance on heavy metal wastewater, in particular heavy metal ion, such as Ni<2+>, Cr<6+>, Cu<2+>, Zn<2+>, Pb<2+> and the like in sewage, such as chemical nickel plating waste liquid, electroplating waste liquid and the like. The preparation method disclosed by the invention is simple and free from by-products and is applicable to industrial production and application.

Compounds useful as nutritional supplements, antioxidants, heavy metal chelators and/or as intermediates for producing other related compounds with like uses have a formula:

where R¹ is an aromatic backbone and R² is a sulfur containing ligand.

The invention relates to a stable heavy metal chelating agent and an use method thereof. The effective ingredient of the stable heavy metal chelating agent is annular polyamine compound containing piperazin or aminoethylpiperazin. A small amount of heavy metal chelating agent can be added in substances to be treated and mixed evenly to form complex of heavy metal with stable chemical property andcan be used to treat waste material or waste liquor with heavy metal, in particular to powdery or adhesive substances with heavy metal such as incineration fly ash, slag, soil, sludge and the like, thus realizing stabilization of heavy metal and reducing the heavy metal release. Compared with other stabilization methods of heavy metal, the heavy metal chelating agent is characterized by less additive amount, no harmful gas product, high degree of stabilization and the like, has stronger practicability and is applicable to substances with heavy metal such as incineration fly ash, slag, soil, sludge and the like.

A method is disclosed for removing heavy metals from a solution of waste or effluent containing chelating agents such as ethylenediamine tetraacetic acid (EDTA), 1,2-cyclohexanediamine tetraacetic acid(CDTA), and citric acid(Citrate), comprising:

acidifying the solution with nitric acid, and

oxidization of the acidified solution under controlled pressure and temperature.

Upon oxidation, the heavy metal chelate (EDTA-m, CDTA-m or Citrate-m) is decomplexed, and heavy metal ions are liberated and can be precipitated using a conventional precipitation method such as by treatment with lime and a flocculent.

The invention discloses a novel desulfurization waste water treatment method. The novel desulfurization waste water treatment method comprises following steps: waste water is pumped into a first grade reaction sedimentation tank from an adjusting tank using a lift pump, NaOH and lime milk are added so as to remove sulfites, sulfates, and non-metallic suspended matters in waste water, and an obtained sediment 1 is delivered into a sludge buffer tank; waste water is delivered into a second grade reaction sedimentation tank from the first grade reaction sedimentation tank via overflowing, NaOH, a heavy metal chelating agent, and a flocculating agent are added so as to remove heavy metal ions in waste water, and an obtained sediment 2 is delivered into the sludge buffer tank; obtained sludge is subjected to sludge-water separation using a plate-and-frame filter press, an obtained filtrate is delivered back into the waste water adjusting tank, and sludge cake is collected; waste water processed via the second grade reaction sedimentation tank is delivered into a clear water tank, HCl is added so as to adjust pH value to be 7, and then obtained water is discharged or recycled. According to the novel desulfurization waste water treatment method, sludge obtained via sedimentation in the first grade reaction sedimentation tank and the second grade reaction sedimentation tank is delivered into the sludge buffer tank via pipelines, so that system blocking of a processing system caused by large amount of sludge is avoided, and quality of the discharged water is increased.