17 results about "Acid mine drainage" patented technology

The application discloses a kind of acid mine wastewater treatment system and processing technology thereof, belong to wastewater treatment technical field, the system includes acid mine wastewater regulating tank, tailings slurry tank, first thickening tank, secondary thickening tank, sludge regeneration tank and sludge thickening tank, acid mine wastewater regulating tank is connected by acid water pump with the water inlet of first thickening tank, tailings slurry tank is connected with the first thickening tank, the water outlet of first thickening tank is connected with secondary thickening tank, the sludge inlet of secondary thickening tank is connected with sludge thickening tank;The sludge inlet of sludge regeneration tank is connected with the sludge discharge port of secondary thickening tank, the sludge discharge port of sludge regeneration tank is connected with the sludge inlet of sludge thickening tank, and waste water treatment is carried out using the system.The application utilizes pyrite beneficiation process tailings slurry cooperates fly ash and active sludge to treat acid mine wastewater, can remove heavy metal simultaneously, realizes acid mine wastewater resource utilization, protects the ecological environment of mining area, reaches the purpose of green production of mine safety.

The application discloses a high-concentration sulfate radical acid mine water treatment method based on acid-resistant SRB biological cathode, which comprises the following steps: after the acid mine water is filtered through a grid, the acid mine water is fed into an adjusting tank; the wastewater in the adjusting tank is fed into a biological membrane electrochemical device to perform an electrochemical reaction; in an anode chamber, Fe 2+ in the wastewater is oxidized into Fe 3+ and releases electrons; in a cathode chamber, the acid-resistant SRB bacterial membrane loaded on the surface of a carbon felt electrode utilizes the transmitted electrons to reduce SO4 2‑ into S 2‑ ; CO2 micro-bubbles are fed into the liquid in the cathode chamber to react with S 2‑ to generate sulfur precipitate, and the mixed solution after the reaction is fed into a cyclone separator to realize gas-solid separation; Fe 3+ in the water in the anode chamber generates Fe(OH)3 precipitate through a hydrolysis reaction, the Fe(OH)3 precipitate is mixed with sodium silicate, and is calcined to be converted into alpha-Fe2O3 with magnetism. The method can effectively remove SO4 2‑ and recover iron mud.

The present application belongs to the technical field of acid mine drainage pollution treatment, and specifically discloses a material for treating acid mine drainage, a preparation method thereof and a wastewater treatment method. The material is a combination of three kinds of natural mineral-based functional materials, which are a first functional material, a slow-release material, mainly a carbonate rock matrix, manganese dioxide and a binder, with a mass ratio of 7-8:1-2:1; a second functional material, a catalytic oxidation material, mainly manganese dioxide, fibrous magnesium-rich clay mineral and a binder, with a mass ratio of 7-8:1-2:1; and a third functional material, a high-performance adsorption material, mainly volcanic clay mineral, manganese dioxide, fibrous magnesium-rich clay mineral and a binder, with a mass ratio of 5-7:1-2:1-2:1; and the mass ratio of the first functional material, the second functional material and the third functional material is 1:10:10. The material provided by the present application is simple to assemble and maintain in the wastewater treatment method, does not need additional chemical agents, avoids sludge blockage and secondary pollution, and has low preparation and treatment costs.

The invention discloses a method for simulating phosphorus and chromium migration during farmland irrigation with acid mine wastewater, which comprises the following steps: mixing a plant-derived organic material with deionized water to obtain a soluble organic matter; h2O2 oxidizes Fe < 2 + > to prepare pure Schwertmannite, and the pure Schwertmannite is placed in a phosphate solution to obtain phosphorus-loaded Schwertmannite; mixing the phosphorus-loaded Schwertmannite and the soluble organic matter with a chromate solution, carrying out oscillation adsorption, carrying out solid-liquid separation after adsorption, carrying out CrO and POconcentration change test on filtrate, and carrying out mineral characterization on separated solids; a three-dimensional fluorescence spectrum is adopted to track composition conversion of the soluble organic matter in the reaction process; and analyzing the component change of the supernate before and after the reaction by adopting Fourier transform ion cyclotron resonance mass spectrometry. The influence mechanism of DOM on phosphorus and chromium fate in mineral / water interface molecular fractionation is disclosed from the molecular level, and a scientific basis is provided for collaborative migration risk assessment of phosphorus and heavy metal in acid mine wastewater irrigation area farmland.

The invention discloses a modified red-mud-based arsenic removal agent for acid mine wastewater as well as a preparation method and application of the modified red-mud-based arsenic removal agent. The preparation method of the arsenic removal agent comprises the following steps: placing the red mud in acid mine wastewater for modification reaction, and sequentially carrying out solid-liquid separation, washing and drying to obtain the arsenic removal agent, the mass volume ratio of the red mud to the acid mine wastewater is 1-15g / L; the pH value of the acidic mine wastewater is 1-3, and the concentration of ferric iron is 3-4g / L. According to the arsenic removal agent, red mud serves as a matrix, the arsenic removal capacity of the red mud can be greatly improved only through impregnation modification by means of the synergistic effect between the red mud and acid mine wastewater, and based on the excellent performance of the red mud-based arsenic removal agent, when the red mud-based arsenic removal agent is used for deep arsenic removal of wastewater, the arsenic removal capacity of the red mud can be greatly improved only through adjustment of the pH of a system. According to the present invention, the arsenic ions with different valence states can be completely and deeply removed by using the arsenic removal agent, and the test results show that the removal rate of the trivalent arsenic can achieve 94.47% and the removal rate of the pentavalent arsenic can achieve 99.99% when the pH value of the system is 12 when the arsenic removal agent is adopted to perform the deep arsenic removal on the wastewater.

This invention relates to a process for treating acidic mine wastewater (AMD). The process includes the following steps: adjusting the pH of the AMD to a range of 3 to 5; adding magnetite nanoparticles to form a slurry; and a) aerating the slurry obtained in step 3), or b) simultaneously heating and mixing the slurry obtained in step 3). The magnetite nanoparticles loaded with one or more metals and sulfate ions and precipitated metals are then separated from the slurry.

The invention discloses a low-calcium fly ash modification method and application thereof in coal mine acid mine water treatment.The low-calcium fly ash modification method comprises the steps that Ca (OH) 2-Na2CO3-MgO-power plant desulfurized gypsum slag is adopted as a composite modifier, and the effective CaO content in low-calcium fly ash is increased to 22% or above through the synergistic effect of calcium source strengthening, alkali excitation acceleration, Ca element stabilization and pore structure optimization; the modified fly ash can efficiently neutralize the acidity of coal mine producing acidic mine water (AMD) and synchronously adsorb and remove Fe < 3 + > and Mn < 2 + > in water, the pH of the treated AMD is stabilized at 6-9, the removal rates of Fe < 3 + > and Mn < 2 + > are both greater than or equal to 98%, and high-value utilization of the low-calcium fly ash and low-cost treatment of the AMD are realized.

The application discloses an acid mine drainage treatment system and a use method thereof, and belongs to the technical field of acid mine drainage treatment. The acid mine drainage treatment system comprises an iron removal device, a neutralization device and a control device, and is characterized in that the iron removal device comprises an adjusting pool, an injection pipe arranged at the side end of the adjusting pool, a reaction mechanism arranged beside the adjusting pool, a first conveying mechanism connecting the reaction mechanism and the adjusting pool, an iron precipitation pool arranged beside the reaction mechanism, and a first connecting pipe connecting the reaction mechanism and the iron precipitation pool; the neutralization device comprises a neutralization mechanism arranged beside the iron precipitation pool, a second conveying mechanism connecting the iron precipitation pool and the neutralization mechanism, a neutralization precipitation pool arranged beside the neutralization mechanism, a second connecting pipe connecting the neutralization mechanism and the neutralization precipitation pool, a third conveying mechanism arranged at one side of the neutralization precipitation pool and a siphon mechanism. The application can realize the treatment of acid mine drainage, resource recycling and mine filling.

In one aspect, the disclosure relates to a continuous process for treating acid mine drainage while simultaneously recovering a high-grade rare earth preconcentrate suitable for extraction of commercially valuable rare earth oxides. In a further aspect, the preconcentrate is from about 0.1% to 5% rare earth elements on a dry weight basis. In another aspect, the disclosure relates to a method for processing the preconcentrate to generate a pregnant leach solution that does not form gels or emulsions and is suitable for processing via solvent extraction. In another aspect, the disclosure relates to a system and plant for carrying out the disclosed process. In still another aspect, the disclosure relates to a composition containing rare earth elements produced by the process disclosed herein. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.

The invention relates to the technical field of wastewater treatment, and discloses acid mine wastewater treatment equipment and process based on microorganisms. The equipment comprises a shell, the two ends of the shell communicate with a water inlet tank and a water drainage tank correspondingly, a top plate is arranged on the shell, and a first electric telescopic rod is fixedly installed on the top plate; a lifting plate is fixedly mounted at the output end of the first electric telescopic rod, a plurality of groups of mounting racks distributed at intervals are fixedly mounted on the lifting plate, the outer side surfaces of the mounting racks are in contact with the inner wall of the shell, biological stuffing is arranged in the mounting racks, and a plurality of groups of blanking grooves corresponding to the mounting racks in position are formed in the inner bottom surface of the shell. The mine acid wastewater treatment device has the beneficial effects that in the mine acid wastewater treatment process, precipitates are cleaned in time, separation of the precipitates and the mine acid wastewater is achieved, and the mine acid wastewater treatment efficiency is guaranteed.

This invention discloses a method for selectively recovering copper, lead, and arsenic from acidic mining wastewater, comprising the following steps: 1) preparing iron-manganese oxides with strong stability under acidic conditions; 2) converting acidic mining wastewater containing copper, cadmium, lead, arsenic, and zinc into copper-cadmium-zinc enriched wastewater and lead-arsenic enriched iron-manganese oxides; 3) converting the lead-arsenic enriched iron-manganese oxides into a lead-containing solution and arsenic-enriched iron-manganese oxides; 4) converting the arsenic-enriched iron-manganese oxides into an arsenic-containing solution and arsenic-loaded iron-manganese oxides; 5) converting copper-cadmium-zinc enriched wastewater into cadmium-zinc enriched wastewater and copper-enriched iron-manganese oxides; 6) desorbing copper from the copper-enriched iron-manganese oxides to obtain a copper-containing solution. This invention can separately enrich and recover copper, lead, and arsenic from acidic mining wastewater, achieving the recovery and utilization of heavy metal resources while treating heavy metal-polluted wastewater, and has a very broad application prospect.

The application discloses an acid mine water producing site integrated prevention and treatment system and method, which comprises a pretreatment part, a treatment part, a solid-liquid separation part and an acid return prevention part. The outlet of the pretreatment part is connected with the inlet of the treatment part. The first outlet of the treatment part is connected with the inlet of the solid-liquid separation part. The second outlet of the treatment part and the liquid outlet of the solid-liquid separation part are both connected with the inlet of the acid return prevention part. The application has scientific principles and is easy to operate. The application can be used for treating acid mine water on site of a coal mine, so that the treated wastewater can meet the discharge standard and no longer return acid. The microbial electrolysis device can degrade sulfate ions in the wastewater more completely, so that energy can be saved, addition of pH adjusting reagents can be avoided, treatment cost can be reduced, secondary pollution can be avoided, fine sulfur ore can be obtained after treatment, and economic and environmental benefits can be achieved.

The invention provides an acid mine water traceability method and device, and relates to the technical field of pollution traceability, the method comprehensively considers water chemical fingerprints, environmental isotope composition, microbial community structure and multivariate data characteristics of soluble organic molecules, breaks through the limitation that a traditional method depends on a single index for traceability, and improves the traceability accuracy. Fusion analysis of multi-dimensional and multi-source information is realized; on the basis, a characteristic parameter combination capable of effectively distinguishing each end member is screened, a Bayesian end member mixed model constructed based on the law of conservation of mass and an MCMC solving method are combined, the probability relation between priori knowledge and actually measured data is fully utilized, and under the complex condition of mutual superposition and interference of pollution source signals, the probability relation between the priori knowledge and the actually measured data is fully utilized. The contribution ratio of each acid mine water end member to the mixed water sample and the confidence interval thereof are accurately deduced, and the scientificity, precision and reliability of a traceability result are remarkably improved.

The application discloses a kind of acid mine drainage and urban sewage combined advanced treatment device and method, comprising: urban sewage storage area, homogeneous conditioning area, permeable reaction wall area and automation control area.The application couples and disposes acid mine drainage and urban sewage to achieve the purpose of "waste treatment with waste", simultaneously realizes the reduction and resource of acid mine drainage and urban sewage, has the significant advantages of low cost, high stability, efficient removal of multiple types of pollutants and waste resource allocation optimization and reuse, meets the sustainable development needs of water plant and permeable reaction wall technology, and is suitable for engineering popularization and application.

The invention belongs to the field of environmental treatment of acid mine drainage pollution and preparation of iron oxide red, and relates to a method for efficiently treating acid mine wastewater and recovering high-purity iron oxide red. The method comprises the following steps: filtering impurities in mine drainage, adding a hydrogen peroxide reagent in proportion according to the iron concentration in water and the total amount of the hydrogen peroxide reagent and acid mine drainage, stirring, increasing the pH value to 3.5 + / -0.5 by using sodium hydroxide, filtering to obtain bottom mud, drying, grinding into powder, and calcining to obtain the high-purity iron oxide red. The method is a process capable of treating mine drainage to reduce pollution and recycling acid mine drainage to extract iron oxide red. The method is a recycling technology for mine drainage treatment, which is simple in process and less in production equipment.

The invention belongs to the technical field of acid mine seepage water, and particularly relates to an alkaline slow-release material for treating acid mine seepage water, a preparation method of the alkaline slow-release material and a treatment method of acid mine seepage water with high sulfate radical concentration. The alkaline sustained-release material is prepared from the following raw materials: a cementing material, an alkaline substance and water, the mass ratio of the cementing material to the alkaline substance is (2-7): (3-8); the cementing material is selected from at least one of cement, fly ash and slag powder; the alkaline substance is selected from at least one of quick lime, slaked lime, limestone and alkali metal hydroxide. The invention has the following beneficial effects: the alkaline release mode is fundamentally improved, and the problems of instantaneous over-alkalinity and fluctuation are solved; the material structure is optimized, and the mechanical strength and the long-term effect are both considered; and the treatment efficiency and the economical efficiency are both improved for the high-sulfate-radical wastewater.

The invention relates to a method for separating and recovering metal resources from acid mine wastewater, and belongs to the field of mine environment treatment and comprehensive utilization of secondary resources. The method comprises the following steps: (1) mixing the acidic mine wastewater with a composite agent, carrying out precipitation purification treatment, and carrying out solid-liquid separation to obtain heavy metal sludge; the composite agent is a combination of an oxidizing agent, a vulcanizing agent and a neutralizing agent, and the composite agent does not contain calcium element; and (2) the heavy metal sludge is subjected to a hydrothermal reaction, and hematite and a solution containing metal ions are obtained. By means of the method, economic, efficient and short-process harmless treatment of AMD and comprehensive utilization of metal resources are achieved, and AMD treatment is promoted to be converted from passive treatment to resource regeneration, so that the environmental ecological safety is effectively guaranteed, and the resource utilization efficiency is effectively improved.