15results about How to "Reduce leaching concentration" patented technology

The invention relates to the technical field of fly ash treatment, in particular to a method for preparing a concrete block from fly ash. The method comprises the following steps: washing the fly ash with water to obtain chlorine-removed fly ash; mixing the chlorine-removed fly ash with an additive, and carrying out ball milling treatment to obtain detoxified fly ash; and mixing the detoxified fly ash, cement, bluestone and fine sand, and performing constant-temperature and constant-humidity maintenance to obtain the concrete block. According to the method, the fly ash is washed with water before ball milling treatment, chlorine salt in the fly ash can be effectively removed, the situation that the solidification effect of heavy metal is affected in the ball milling treatment is avoided, the water consumption of the ball milling treatment can be reduced, water is saved, and the quality of the fly ash is effectively improved.

The invention belongs to the technical field of lead-containing solid waste environmental pollution prevention and control, and particularly relates to a compound stabilizer for efficiently stabilizing lead in waste incineration fly ash, and the stabilizer comprises sodium dimethyl dithiocarbamate and urea in a mass ratio of 1.5-2.5. The urea and the sodium dimethyl dithiocarbamate are compounded according to a specific proportion, so that the urea and the sodium dimethyl dithiocarbamate generate a synergistic effect in the process of stabilizing the heavy metal Pb, the heavy metal Pb in the solid waste is compounded and chelated, in a stability performance evaluation experiment, after the solid waste fly ash is treated by the compound stabilizer, the leaching concentration of the heavy metal Pb is remarkably reduced, and the leaching efficiency of the heavy metal Pb is remarkably improved. And compared with a commercial stabilizer, the content is reduced by 2.55 times. In addition, due to the fact that urea replaces part of organic reagents in the preparation process, the use amount of CS2 is reduced, compared with a commercial stabilizer, the novel compound stabilizer is reduced to 5000 yuan / ton from 6500 yuan / ton, the cost is saved by 10% or above, and meanwhile the toxicity of the stabilizer is reduced.

The invention discloses a preparation method and application of anhydrite-celestite solid solution. A calcium nitrate solution and a strontium nitrate solution are prepared into a mixed solution according to different proportions, and a sodium sulfate solution is used as a precipitator. Strontium-containing gypsum is generated through a coprecipitation method, and after calcination, anhydrite-celestite series solid solutions are obtained. During application, a proper amount of anhydrite-celestite series solid solution is taken and placed in three different aqueous solutions at room temperature to be dissolved, and the distribution rule of the strontium-containing sulfate solid solution in the aqueous solutions is explored. The anhydrite-celestite series solid solution obtained by the method has the advantages of mild reaction conditions, easily available raw materials, high crystallinity and the like. Wherein in the coprecipitation experiment process, the removal rate of strontium in the mixed solution is close to 100%.

The invention provides a treatment method and a treatment system for high-salinity wastewater, and aims to solve the problems of high treatment difficulty and high operation cost in the existing high-salinity wastewater treatment process. The treatment method comprises the following steps: 1) extracting hazardous waste samples containing high-salinity wastewater in batches, and carrying out a curing test and a leaching test in a laboratory; (2) according to a test result, the adding proportion of all components of the hazardous waste is determined, and the components are input into a blender to be subjected to curing treatment; 3) fully stirring and mixing the hazardous wastes by a mixer; 4) conveying the mixture to a curing area for curing; (5) detecting the leaching result of the solidified body after curing, transferring the qualified solidified body to a rigid landfill area for landfill, crushing the unqualified solidified body by a crusher, and continuously conveying the crushed solidified body to a blender for solidification treatment; the treatment system comprises a high-salinity wastewater metering device, a solid salt metering device, a fly ash metering device, a blender, a maintenance station and a rigid landfill. The invention solves the problems of high treatment difficulty and high operation cost of high-salinity wastewater, and achieves the purpose of treating waste with waste.

This invention discloses an industrial production method for cement clinker that co-processes heavy metal-containing waste, comprising: raw meal preparation: raw meal is prepared according to the following proportions by weight: 84-87 wt% calcareous raw materials, 6.0-7.2 wt% clayey raw materials, 4.8-5.8 wt% corrective raw materials, and 2.0-4.5 wt% heavy metal-containing waste; addition of composite synergist: a heavy metal adsorption-mineralization composite synergist is added to the raw meal; pre-decomposition: the homogenized raw meal is preheated by a multi-stage cyclone preheater and then enters a decomposition furnace for carbonate decomposition; clinker calcination: the decomposed raw meal enters a rotary kiln and is calcined at 1350-1450℃ to form clinker; and rapid cooling of clinker: the calcined clinker is rapidly cooled to room temperature by a grate cooler to obtain finished cement clinker. This invention can achieve a total solidification rate of heavy metals in clinker of 93%, and increase the retention of Pb, Cd and Zn by 13.9 times, 59.1% and 11.5% respectively, and increase the 28-day compressive strength to 61.8 MPa.

The present invention relates to a process for producing aluminum silicate ceramic fiber by resource utilization of hazardous waste fly ash, which belongs to the technical field of resource utilization of solid waste, and includes the following steps: obtaining fly ash and additives, formulating a melting compounding scheme according to the material composition; determining the process formula according to the melting compounding scheme, and then desalting the fly ash; transporting the fly ash and additives to the weighing bin, inputting the process formula into the program, and the system adopts PLC control for automatic metering, batching, and unloading; then melting at high temperature at 2100-2800℃ to form a magma body; testing the composition of the magma body, and conducting acid leaching toxicity testing; spinning into fibers, and obtaining. In the high-temperature melting process, dioxins are effectively decomposed, and most of the heavy metals are solidified in the aluminum silicate ceramic fiber. The aluminum silicate ceramic fiber cotton formed by the acupuncture operation, drying, shaping, and cutting and rolling of the aluminum silicate ceramic fiber meets the GB / T 16400-2023 standard.

The present invention discloses a method for repairing soil contaminated by electrolytic manganese slag by inoculating white rot fungi, comprising the following steps: mixing biomass and soil contaminated by electrolytic manganese slag to obtain compost raw materials; inoculating white rot fungi in the compost raw materials to obtain a pile; composting and fermenting the pile to obtain compost mature material, thereby completing the repair of soil contaminated by electrolytic manganese slag. The present invention effectively reduces the leaching amount of heavy metal manganese by inoculating white rot fungi, effectively reduces the mobility and bioavailability of heavy metal manganese, effectively changes the structure of microbial communities, increases the number and diversity of microorganisms, improves the seed germination index, and realizes the repair of soil in contaminated sites. It has the advantages of quickly starting composting repair, effectively reducing the leaching amount of heavy metal manganese, reducing the mobility and bioavailability of heavy metal manganese, increasing microbial diversity and community abundance, and improving the seed germination index.

The application discloses a solid waste-based cementing material and a preparation method and application thereof, and belongs to the technical field of building materials. After grading pretreatment of industrial by-product gypsums of different sources, the industrial by-product gypsums are dry-mixed with active mineral admixtures, heavy metal stabilization components and sulfate activators, water is added for first-stage hydration and standing, the sulfate activation is preferentially caused to form ettringite and dihydrate gypsum crystal framework, and then silicate activators are added for second-stage hydration to generate C-(A)-S-H gel, so that the ordered generation of hydration products is realized. Through step-by-step cooperative activation, the early compressive strength is increased by 30%-50% compared with one-time addition of activators, the 28d softening coefficient can reach more than 0.76, meanwhile, the heavy metal ion leaching concentration is reduced by more than 80%, the quality standard requirement of underground water is met, and through the design of special pretreatment processes for desulfurization gypsum, phosphogypsum, fluorogypsum and citric acid gypsum respectively, the same set of modifier composition can adapt to various gypsum sources, and the quality stability is greatly improved.

This invention discloses a method for immobilizing multiple heavy metals in heavy metal-containing residual salts using a microcrystalline reinforced glass body, belonging to the field of hazardous waste harmless and resource-based treatment technology. This method targets residual salts containing heavy metals such as Cr, Pb, and Zn. The residual salts are mixed with silica, limestone, soda ash, and fluorite in a specific ratio, and then melted and homogenized to form a base glass with high sulfur and chlorine tolerance. Based on this, a microcrystalline reinforced glass solidified body with coexisting glass and crystalline phases is constructed through controlled crystallization treatment. This method achieves simultaneous and efficient immobilization of multiple heavy metals such as Cr, Pb, and Zn. The leaching concentrations of Cr, Pb, and Zn in the solidified product are below 0.168 mg / L, 0.207 mg / L, and 0.188 mg / L, respectively, significantly lower than the limits specified in GB / T 41015-2021, demonstrating excellent long-term environmental stability.

The invention discloses a method for preparing anhydrite-lead vitriol by curing lead with sulfate and application of the anhydrite-lead vitriol. According to the method, sodium sulfate reacts with calcium nitrate and lead nitrate to obtain a lead-containing gypsum solid solution, and the lead-containing gypsum solid solution is contained into a crystal structure of calcium sulfate by adjusting the concentration of lead, so that toxic metal lead dissolved in the environment is removed. The curing mechanism is that when a new solid phase forms a continuous and uniform layer on a mineral substrate, the dissolution of toxic metals is obviously hindered. The anhydrite-lead vitriol prepared by removing water molecules from the lead-containing gypsum series solid solution at high temperature can be used for sealing toxic metal lead. During application, a proper amount of anhydrite-lead vitriol series solid solution is taken and dissolved in three different aqueous solutions under the condition of 25 DEG C, and the evolution of the interaction process of the anhydrite-lead vitriol series solid solution in the aqueous solutions is understood. The anhydrite-lead alum series solid solution obtained by the method has the advantages of simplicity in operation, low cost, easiness in control and the like.

The invention provides a preparation method of sludge-based biochar for directionally enriching iron phosphate through synergistic modification of ferrous sulfate and sodium persulfate, and belongs to the technical field of harmless treatment and resource utilization of municipal sludge and environmental functional materials. According to the method disclosed by the invention, active phosphorus in the sludge is converted into a stable iron phosphorus compound in advance through oxidation-complexation dual effects of the ferrous sulfate heptahydrate and the sodium persulfate; the phosphorus-rich sludge is converted into more stable phosphorus-rich biochar through two-step heat treatment, the whole process of sludge pyrolysis is cooperatively regulated and controlled through Fe < 2 + > / S2O8 < 2->, integration of phosphorus release, phosphorus fixation and heavy metal passivation is achieved, the problem that in the prior art, the phosphorus retention rate is low is solved, phosphorus resources in the phosphorus-rich sludge are extremely retained and stabilized, and the phosphorus-rich sludge is obtained. The fixed rate of phosphorus in the modified sludge-based biochar with directionally enriched iron phosphate prepared by the method is greater than 99%.

The invention discloses a preparation method and application of a prussian blue analogue composite material derived from a bimetallic (cobalt and iron) zeolite imidazole framework. A bimetallic (cobalt and iron) zeolite imidazole framework (CoFex-ZIF) is used as a self-sacrifice template, cobalt and iron Prussian blue analogues (PBA) grow in situ on the CoFex-ZIF at room temperature according to an ion exchange strategy, then a CoFex-ZIF / PBA composite material is successfully prepared and combined with an advanced oxidation technology, and a CoFex-ZIF / PBA / PMS / Vis advanced oxidation technology system is constructed and used for removing organic pollutants. Wherein the CoFe < 2.5 >-ZIF / PBA / PMS / Vis system has ultrahigh PMS utilization efficiency (71%) and good decontamination activity (the rate constant is 1.081 min <-1 >), and the CoFe < 2.5 >-ZIF / PBA / PMS / Vis system exceeds most heterogeneous Fenton advanced oxidation catalysts.

The invention discloses equipment and a method for preparing baking-free bricks from waste incineration slag. The equipment comprises a slag pretreatment device and a baking-free brick preparation device, wherein the slag pretreatment device comprises a support; the liquid storage frame is arranged on the support and is used for cleaning slag in a vibrating manner; a feeding box assembly is arranged on the transmission assembly; the stepped screening magnetic attraction assembly is arranged between the liquid storage frame and the feeding box assembly; the baking-free brick preparation device comprises a movable stirring frame assembly arranged on one side of the support; the preparation module is arranged close to one side of the movable stirring frame assembly; and the water injection assembly is arranged on one side of the support. According to the method, the slag is pretreated, the risk of environmental pollution is reduced, meanwhile, the leaching concentration of heavy metal can be reduced, a certain solidification and stabilization effect is achieved, in addition, the selected slag and river sand are uniform in particle size distribution, chemical reaction can be conducted stably and safely, and the compressive strength is enhanced.

The invention provides an electrolytic manganese residue harmless curing agent and a curing method thereof, and belongs to the technical field of industrial waste residue treatment. The harmless curing agent for the electrolytic manganese residues comprises the following raw materials in parts by weight: 40-80 parts of the electrolytic manganese residues, 30-50 parts of iron-aluminum mud, 5-15 parts of slag, 3-8 parts of kaolin, 8-12 parts of anhydrous phosphogypsum and 20-40 parts of water. The electrolytic manganese slag is solidified by adding the iron-aluminum mud, the slag, the kaolin and the anhydrous phosphogypsum, the obtained solidified body can remarkably reduce the leaching concentration of Mn < 2 + > and NH4 < + >, and the compressive strength of the manganese slag solidified body is improved.

The invention discloses a soil remediation agent as well as a preparation method and application thereof, and relates to the technical field of soil remediation. The preparation method of the soil remediation agent comprises the following steps: mixing papermaking black liquid with an alkaline solution containing calcium ions to obtain a mixed solution, filtering the mixed solution to obtain filter residues, and carbonizing to obtain the soil remediation agent. According to the preparation method of the soil remediation agent provided by the technical scheme of the invention, the black liquor waste is taken as a raw material, the soil remediation agent with a porous structure is prepared through a pyrolysis carbonization process, and the prepared soil remediation agent not only can improve the pH of acid soil and remarkably reduce the leaching concentration of heavy metal cadmium, but also can provide necessary nutritional ingredients for crops. The preparation method of the soil remediation agent provided by the technical scheme of the invention realizes efficient recycling of the papermaking black liquid, and can be used for solving the problems of high cost and poor cadmium pollution treatment effect of the soil remediation agent.