20 results about "Lead pollution" patented technology

The invention discloses a lead-contaminated soil remediation method and application thereof. The remediation method comprises the steps of pretreatment and conditioning of contaminated soil, addition and mixing of a phosphate remediation agent, thermal induction enhanced reaction and stabilization effect evaluation. According to the remediation method, the remediation efficiency of the contaminated soil can be greatly improved, the remediation stability can be improved, secondary dissolution of phosphorus in the remediation process can be inhibited, and resource utilization of the high-lead contaminated soil is achieved.

This invention belongs to the field of biodetection technology, specifically relating to a lead pollution detection probe and a method for lead ion detection. It consists of a probe EDP and a probe RFP. The probe EDP includes a substrate chain that binds to an RNA base (rA) and an enzyme chain. The probe RFP is a hairpin probe, with a fluorescent group FAM and a quenching group Dabcyl at its stem and a cleavage site for an endonuclease at its loop. The method combines DNAzyme with an enzyme-assisted amplification strategy to detect lead pollution and lead ions. 2+ Low-cost, simple and efficient detection.

The invention provides a method for enriching rare earth ore in low-grade apatite. The method comprises the steps of ore pretreatment, graded desliming, three-time graded flotation and four-time rare earth rough concentrate concentration. According to the method, efficient mineral dissociation is achieved by optimizing the pretreatment process, an environment-friendly zinc phosphate complex is adopted to replace lead nitrate to serve as a modification activating agent, the flotation selectivity and the recovery rate of the rare earth minerals are improved by combining the synergistic effect of a specific regulator and a collecting agent, and finally the rare earth minerals with the raw ore grade being 0.15%-0.50% are enriched to the grade being 11.65%-12.55%; and the recovery rate reaches 85% or above, meanwhile, the production cost is reduced, the lead pollution risk is eliminated, and green and efficient utilization of low-grade apatite associated rare earth resources is achieved.

A preparation method of lawn bricks capable of solidifying and stabilizing lead-contaminated soil includes: preparing carbonized bagasse, grinding and mixing the carbonized bagasse and potassium carbonate in a mortar, heating the resulting mixture to 600-650° C., and maintaining for 2-3 hours; fully mixing the carbonized and treated bagasse, heavily-lead-contaminated soil, construction waste and fly ash; then adding a treated sodium silicate solution and stirring, and reacting under ultrasonic conditions; and performing grouting and compacting to obtain a homogeneous green brick, and curing same to obtain a lawn brick. The bagasse is taken as a raw material, and is carbonized and then mixed with the pre-treated heavily-Pb-contaminated soil, construction waste and fly ash, and under an action of alkali excitation and ultrasonic assistance, the resulting mixture is cured to form the lawn brick, such that Pb (II) in the Pb-contaminated soil is not migrated and converted any more.

The invention discloses a preparation method of magnetic magnesium-iron co-modified biochar and application of the magnetic magnesium-iron co-modified biochar in lead ion adsorption, and belongs to the technical field of environmental functional materials.According to the magnetic magnesium-iron co-modified biochar adsorbent prepared through the method, Mg and Fe are successfully loaded to the surfaces of corn straw by increasing the surface roughness of the magnetic magnesium-iron co-modified biochar adsorbent, and the magnetic magnesium-iron co-modified biochar adsorbent is prepared. The maximum adsorption capacity of the biochar to lead ions Pb (II) is effectively improved, the biochar has magnetism and excellent separation and recovery performance, the biochar can be efficiently recovered from a solution and reused, the adsorption process follows a quasi-second-order kinetic model and a Langmuir adsorption model, and the adsorption efficiency is greatly improved. The main mechanism of the adsorption process is electrostatic attraction, H bond adsorption, pi-pi interaction, surface complexation and ion exchange, the adsorption efficiency of the lead ions Pb (II) is effectively improved, and an efficient, low-cost and environment-friendly solution is provided for lead pollution treatment.

The invention relates to the technical field of heavy metal element detection, in particular to a method for detecting a lead-polluted water body, which specifically comprises the following steps: immersing a detection material into the lead-polluted water body to observe the color change of the detection material; the detection material is sulfhydrylated dedimethylcurcumin, the sulfhydrylated dedimethylcurcumin is used as an element for identifying lead ions through the principle that small molecules and metal ions are combined to form color reaction, the sulfhydrylated dedimethylcurcumin can be used for qualitative detection of lead polluted water, and the detection limit of the lead ions can reach 0.005 mg / L.

The invention discloses an agent for intensively repairing lead pollution, a preparation method of the agent and a repairing method. The agent is prepared from 15%-20% of penicillium chrysogenum, 10%-15% of rhodotorula glutinis, 25%-30% of hydroxyapatite, 5%-8% of sodium alginate, 10%-15% of modified crab shell powder and the balance water. The preparation method comprises the steps of S1, pretreatment, S2, medicament compounding and forming and S3, curing treatment. The reinforced lead pollution remediation agent prepared by the invention can be used for completing remediation of contaminated soil within 7 days, so that the concentration of Pb < 2 + > is reduced by 93% or above; and after 6 months of natural aging, the conversion rate of the fixed-state lead is less than 5%, and the lead repairing agent has efficient lead repairing capability and repairing long-term effect.

This invention discloses a method for passivating lead ions and other heavy metals through a permeation process, belonging to the field of heavy metal pollution control technology. Addressing the problems of uneven penetration, poor stability, and low utilization rate of existing lead pollution passivation technologies, this invention first pre-treats the lead-containing contaminated medium to adjust its moisture content. Then, a composite passivating penetrant is prepared by compounding phosphates, sulfides, zero-valent iron powder, and nonionic surfactants. This penetrant is injected into the medium in two stages using high-pressure rotary jet spraying, followed by controlled pressure and volume and 10-14 days of moisture retention curing. This invention improves the uniformity and utilization rate of the agent penetration through synergistic agent action and a staged injection process. After treatment, the TCLP leaching concentration of lead ions is consistently below 5 mg / L. This method is suitable for lead-containing media such as contaminated soil, sediment, tailings, and smelting waste, exhibiting high passivation efficiency, strong stability, and environmental friendliness.

The invention relates to the technical field of lead-containing waste residue treatment, and particularly discloses a method for stably treating lead-containing waste residues for a long time. The citric acid activated phosphorus source is adopted, the phosphorus supply capacity of a phosphorus-containing compound is enhanced, the reaction degree of lead phosphate precipitate generation is improved, meanwhile, the lead-containing rare earth waste residues obtained after treatment of the citric acid activated phosphorus source are treated with sodium molybdate, the surface of a solidified body is coated with unsolidified lead ions, a continuous and compact lead molybdate protection film is formed, and the lead phosphate precipitate generation reaction degree is improved. And secondary dissolution of lead is prevented, and the curing effect is enhanced. The pH value of the lead-containing rare earth waste residues treated through the method is 6-9, the acid leaching amount of lead does not exceed 1.2 mg / L, meanwhile, the lead pollution stabilizing treatment time is greatly shortened, the waste residue treatment efficiency is remarkably improved, the actual requirement for large-scale waste residue rapid treatment is met, the method can be widely applied to waste residue treatment in multiple scenes such as mining and rare earth smelting, and the method has a wide application prospect. The industrial popularization value is extremely high.

A blast furnace recovery smelting device and method for lead-containing materials, belonging to the field of environmental protection technology. The device includes a blast furnace, a powder storage tank, a mixer, a pulverized coal distributor, a lower annular flue, an upper annular flue, a furnace gas lead recovery system I, a furnace gas lead recovery system II, a blower I, a blower II, and a nitrogen sweeper. The present invention uses the blast furnace smelting process to smelt and recover lead-containing materials, and utilizes the lead vapor pressure difference generated by the temperature difference of the flue gas in the blast furnace to introduce part of the lead-containing furnace gas into the lead recovery system for repeated recovery. While smelting iron and steel, the present invention also recovers and processes waste batteries, killing two birds with one stone. Moreover, it will not cause lead pollution to the gas and slag, the molten iron does not have an increase in lead content, and the energy consumption is also very low. The present invention has no risk of secondary pollution, and the lead emission is almost zero; the transformation of the existing iron-making blast furnace has less investment and low operating costs; no waste is generated.

The present invention belongs to the field of heavy metal pollution control technology and relates to a lead-contaminated soil remediation agent, its preparation method, and application. The lead-contaminated soil remediation agent of the present invention mainly comprises the following components, by weight: 15-25 parts of alkali-modified corncob biochar, 15-25 parts of chitosan, 10-20 parts of modified bentonite, 10-15 parts of calcium silicate, 8-12 parts of lime, and 8-12 parts of diatomaceous earth. The present invention combines these components to exhibit a significant synergistic effect in lead-contaminated soil, achieving a passivation rate of 85.9% in lead-contaminated soil, reducing the activity of lead in the soil and inhibiting crop absorption.

The present invention discloses a method for treating lead pollution in water, which comprises the following steps: Step 1, detecting the lead ion concentration of the water to be treated, adding hemin to the water to be treated and stirring and shaking to form a suspension; Step 2, filtering the suspension to obtain a filter residue and a clean aqueous solution after treating lead ions; Step 3, soaking the filter residue in an acidic solution to form an acidic suspension, and then filtering to obtain hemin and a lead-containing acid solution; Step 4, recycling hemin, and adding an excessive precipitant to precipitate and fix the lead ions after the lead ion concentration in the lead-containing acid solution reaches a preset threshold. The present invention can make the lead ion concentration in water reach an extremely low level by using hemin, and hemin can be recycled, without causing secondary pollution and reducing the treatment cost of lead ions.

The utility model provides a utilization system for recycling lead sulfate, which comprises a recycling box, a stirring tank, a lead slime filter press and an acid box, the recycling box is arranged at the positions of an acid spraying roller and a wringing roller of a plate coating machine, a lead slime feeding conveying pipe is arranged between the recycling box and the stirring tank, a lead slime conveying pump is fixed on the lead slime feeding conveying pipe, and the acid box is arranged on the stirring tank. Lead sulfate collected in the recycling box is pumped to the stirring tank through a lead slime conveying pump and a lead slime feeding conveying pipe, a lead slime discharging conveying pipe is arranged between the stirring tank and the lead slime filter press, a first diaphragm pump is fixed to the lead slime discharging conveying pipe, a material receiving barrel is placed below the lead slime filter press, and a second diaphragm pump is fixed to the material receiving barrel. Lead slime cakes obtained after filter pressing of the lead slime filter press fall into a material receiving barrel below the lead slime filter press, and an acid liquor conveying pipe is arranged between the lead slime filter press and the acid box. The lead slime utilization system is simple in component composition, ensures timely recovery of lead slime, reduces residence time of the lead slime in a production field, reduces waste of resources, and is not easy to cause lead pollution.

The invention relates to the technical field of soil heavy metal pollution treatment, in particular to a preparation method of a modified clay mineral for soil heavy metal cadmium and lead pollution treatment, and the preparation method comprises the following steps: S100, removing crystal water in a duty void channel in the clay mineral; s200, the clay minerals are soaked in diluted hydrochloric acid, washed to be neutral and then dried; s300, drying under the protection of inert gas; s400, adding the clay minerals into sodium hydroxide, stirring, washing to be neutral, and drying; s500, adding a sodium silicate solution into the clay minerals to form primary clay minerals; s600, the primary clay minerals are added into a kiln, and ammonia gas is introduced for drying; and S700, the dried clay minerals are crushed and sieved. The adsorption, immobilization and complexation capabilities of heavy metal ions are improved through the prepared clay mineral.

This invention discloses an agent for enhanced remediation of lead pollution, its preparation method, and remediation method. The agent comprises 15-20% Penicillium chrysogenum, 10-15% Rhodotorula rubrum, 25-30% hydroxyapatite, 5-8% sodium alginate, 10-15% modified crab shell powder, and the balance being water. The preparation method includes: S1, pretreatment; S2, agent compounding and molding; S3, solidification treatment. The enhanced lead pollution remediation agent prepared by this invention can complete the remediation of contaminated soil within 7 days, reducing Pb levels. 2+ The concentration is reduced by more than 93%; and after 6 months of natural aging, the conversion rate of fixed lead is less than 5%, demonstrating highly efficient lead repair capabilities and long-lasting repair effects.

The invention relates to application of phycocyanin in relieving lead pollution and promoting plant growth, and belongs to the technical field of agricultural biology. The invention provides application of phycocyanin to preparation of a fertilizer for relieving lead pollution and promoting plant growth. Application in preparation of a fertilizer for relieving lead pollution and stabilizing plant photosynthesis; the invention also relates to application in preparation of a fertilizer for relieving lead pollution and improving plant oxidation resistance. The invention is applied to preparation of a fertilizer for relieving damage of lead toxicity to plant organelle structures and functions. The application comprises vegetable planting, and / or field crop planting, and / or soil environment improvement. The phycocyanin provided by the invention can relieve lead pollution, promote plant growth, stabilize plant photosynthesis, improve plant oxidation resistance and relieve damage of lead toxicity to plant organelle structures and functions. The method has great social and economic values for improving lead pollution environment and improving crop yield and quality.

The invention relates to the technical field of gold and antimony beneficiation, in particular to a high-arsenic and poor-antimony gold ore regulator and a method for recovering antimony by using the regulator. The adjusting agent comprises an adjusting agent A and an adjusting agent B; the regulator A comprises 35-45% of oxalic acid, 35-40% of aluminum sulfate, 10-15% of sodium fluosilicate and 5-10% of ammonium chloride; the regulator B comprises 5-15% of sodium humate, 10-20% of ammonium sulfate, 20-30% of sodium sulfite, 15-20% of calcium chloride and 20-40% of bleaching powder. When the raw ore pulp is subjected to gold-antimony mixed roughing, the regulator A is added, the flotation index equal to that when lead nitrate serves as an antimony activating agent can be obtained, and lead pollution can be eliminated; and a regulator B is added when the gold-antimony mixed pre-concentration ore is subjected to antimony roughing and concentration, poison sand in ore pulp is efficiently inhibited under the condition that the pH value is 5-6.5, then high-gold low-arsenic antimony concentrate with the qualified antimony grade and high-arsenic low-antimony gold concentrate with the antimony grade not exceeding the standard are obtained, and efficient comprehensive recycling of the high-arsenic poor-antimony gold ore is achieved.

The application discloses modified biochar as well as a preparation method and application thereof, mixes biomass and sepiolite powder, obtains mixed solid matters through ball milling; adds the obtained mixed solid matters into water, carries out ultrasonic treatment, obtains biomass / sepiolite mixed slurry; carries out microwave heating on the obtained biomass / sepiolite mixed slurry, carries out reaction, and obtains the modified biochar. The modified biochar provided by the application realizes the synergistic effect of the biochar and the sepiolite by microwave co-pyrolysis, and the sepiolite is closely combined with the biochar to prepare a composite material. Compared with traditional biochar, the modified biochar improves the lead removal effect of water bodies and soil, has a lower lead leaching risk, and simultaneously, the preparation method and cost are improved, and the modified biochar can be used as an adsorbent for treating lead-containing wastewater and a lead pollution soil passivator.

The utility model discloses a continuous casting and rolling lead belt cooling mechanism, and relates to the technical field of lead belt production. The device comprises a pair of extrusion rollers which penetrate through a lead belt between the extrusion rollers to extrude the lead belt, spray pipes and negative pressure covers for spraying water to the extrusion rollers are arranged on the two sides of the extrusion rollers above the lead belt; the negative pressure cover is communicated with a water mist steam treatment device, and the water mist steam treatment device is communicated with the negative pressure generating device; the water mist steam treatment device comprises a closed box body, the top of the box body is communicated with an air outlet pipe, and the bottom is communicated with an air inlet pipe; the box body is filled with treating fluid, the bottom end of the air inlet pipe is inserted into the bottom of the treating fluid, and the bottom end of the air outlet pipe is higher than the liquid level of the treating fluid. The negative pressure cover is linked with a water mist steam treatment device, lead-containing steam is forcibly sucked, gas-liquid reaction is forcibly carried out by utilizing the liquid seal type box body, lead pollutants are captured from the source, and the risk of environmental dissipation is remarkably reduced.

The application discloses a preparation method of magnetic magnesium-iron co-modified biochar and application of the magnetic magnesium-iron co-modified biochar in lead ion adsorption, and belongs to the technical field of environmental functional materials. The prepared magnetic magnesium-iron co-modified biochar adsorbent can effectively improve the maximum adsorption capacity of biochar for lead ions Pb (II) by increasing the surface roughness of the biochar adsorbent, successfully loading Mg and Fe onto the surface of corn straw, and the biochar has magnetism and excellent separation and recovery performance, can be efficiently recovered from a solution and reused, and the adsorption process follows a quasi-second-order kinetic model and a Langmuir adsorption model; the main mechanism of the adsorption process is electrostatic attraction, H-bond adsorption, pi-pi interaction, surface complexation and ion exchange, the adsorption efficiency for lead ions Pb (II) is effectively improved, and an efficient, low-cost and environment-friendly solution for lead pollution treatment is provided.