7 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.

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.

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 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.