50results about How to "Eliminate environmental risks" patented technology

The invention belongs to the field of antimony smelting arsenic alkali residue treatment and particularly discloses a wet-method recycling and harmless treatment process for antimony smelting arsenicalkali residue. The process adopts a whole-wet-method treatment process and mainly comprises the eight working procedures of breaking, dissolving for leaching, oxidation for antimony outlet, purification for impurity removing, transition for crystallizing, reduction for arsenic sinking, evaporative crystallization and secondary residue harmless treatment. Recycling and harmless treatment of the arsenic alkali residue, zero emission of waste residue and waste water and up-to-standard discharge of exhaust gas are thoroughly achieved, the long-term plagued arsenic alkali residue environmental pollution problem in the antimony smelting industry in China is thoroughly solved, and the environmental risk caused by stacking the arsenic alkali residue is eliminated; and meanwhile, separation, enrichment and effective recovering of valuable elements are achieved.

The invention discloses a urea-solution-based SCR (selective catalytic reduction) flue gas denitration process and device. According the process, pyrolysis air is pumped from the outside or a second air channel of a boiler, then is pressurized by a first fan and heated to 350-700 DEG C by a pyrolysis air heater arranged in a boiler hearth or a tail air channel, and the heated pyrolysis air enters a pyrolysis reaction air channel together with fresh air; urea solution is sprayed into the pyrolysis air channel by an atomizing spray gun and the atomized urea solution is pyrolyzed into ammonia gas in the pyrolysis air channel; and after being discharged out of the pyrolysis air channel, the ammonia gas is sprayed into boil flue gas via ammonia spraying grilles to participate in the SCR reaction in an SCR reactor arranged in a tail flue of the boiler. the urea-solution-based SCR flue gas denitration process and device have the advantages of high safety, simple structure and easiness in implementation.

The invention discloses a system and process for fluorine-circulation magnesium removal of sulfate solution. The process includes: step one, magnesium removal, to be more specific, adding a fluoride serving as a magnesium removal agent into magnesium-containing sulfate solution, filtering a reaction product, and performing liquid-solid separation, wherein filter residue is magnesium fluoride; steptwo, defluorination, to be more specific, adding a calcium-containing fluorine removal agent into zinc sulfate solution subjected to magnesium removal, filtering a reaction product, and performing liquid-solid separation, wherein filter residue is calcium fluoride; step three, magnesium fluoride conversion, to be more specific, subjecting sulfuric acid and magnesium fluoride generated in the stepone to co-heating reaction in a reaction tank, absorbing hydrogen fluoride by water to obtain hydrofluoric acid, cooling the solution to crystallize, separating out magnesium sulfate crystal, neutralizing obtained hydrofluoric acid by a metal oxide to obtain fluoride solution, and returning the fluoride solution obtained in reaction to the step one to serve as the magnesium removal agent. Therefore, the process realizes fluorine recycling, so that treatment cost is sharply reduced.

The invention discloses a method for removing contaminated-soil heavy mental with magnetic-modified biochar. The method includes the specific steps that the prepared magnetic-modified biochar serves as a soil remediation agent, water serves as a dispersion medium, heavy metal contaminated soil and the magnetic-modified biochar are mixed and make contact with each other, the steps such as high pressure washing sieving, continuous strong mixing, magnetic separating and solid-liquid separating are carried out, and standard soil for agricultural production and construction is obtained. According to the method, the magnetic-modified biochar is applied to heavy metal contaminated soil remediation, the treatment process of leaching waste liquid is fundamentally eliminated, engineering construction and cost are reduced, heavy metal contaminants in soil are thoroughly removed, and the environmental risk is eliminated. Meanwhile, a large amount agricultural waste can be consumed through resourceutilization of the biochar, and contamination caused by waste incineration and landfill and land occupancy are reduced.

The invention discloses concrete lightweight aggregate and a preparation method thereof. The concrete lightweight aggregate is prepared from the following raw materials by mass percent: 60-80% of oil-base drilling cuttings, 10-30% of civil sludge, 0.8-7% of a pore-forming agent and 9-9.3% of water. The preparation method comprises the following steps: (1) evenly mixing the dry oil-base drilling cuttings with the civil sludge and the pore-forming agent, and then carrying out ball-milling on the obtained mixture to obtain a raw material; (2) putting the prepared raw material into an automatic ball forming mill for balling, evenly sprinkling water in a balling process, aging the prepared green body after balling is finished, and then drying; (3) calcining the dried green body, and then cooling the product along with a furnace so as to obtain the concrete lightweight aggregate. The main raw materials of the concrete ceramsite lightweight aggregate prepared by the method are solid wastes, and all technical indexes of the concrete ceramsite lightweight aggregate meet the related requirements of standard in China; furthermore, the concrete lightweight aggregate is good in leaching resistance, does not cause secondary pollution and low in cost, thus having better industrial application prospect.

The invention discloses a process system and method for cooperatively disposing arsenic alkali residues in a recycling manner by a cement kiln. The system comprises an arsenic alkali residue crushingsystem, a low-melting-point heavy metal waste residue combined smelting furnace incineration system, a cement kiln cooperative enhanced flue gas arsenic and antimony removal system, a cement early strength agent preparation system and an alkali removal system. The method comprises the following steps: after crushing the arsenic alkali residues, adding a silica raw material and coal in the arsenicalkali residues, and carrying out high-temperature calcination; sublimating arsenic and antimony in the arsenic alkali residues at different high temperatures and separating the arsenic and the antimony from entering flue gas by the low-melting-point heavy metal waste residue combined smelting furnace incineration system; after treating generated high-temperature flue gas, delivering the high-temperature flue gas into a cement kiln system to be incinerated and solidified again; separately taking collected arsenic-containing dust and antimony-containing dust as raw materials for smelting the arsenic and the antimony; and preparing a cement early strength agent or a high-concentration soda ash solution by using a remaining lumpy material. According to the invention, the arsenic alkali residues are incinerated at a high temperature, so that the toxic hazard of the arsenic alkali residues is eliminated, and the requirements of developing circular economy and sustainable development are met.

The invention discloses a preparation method of an organic cobalt complex. The preparation method comprises the following steps: 1) in an acidic aqueous solution, mixing and then reacting a compound II and sodium nitrite, and adding sulfamic acid until the rest sodium nitrite is reacted completely; 2) adding a compound IV into an alkaline aqueous solution to prepare a compound IV aqueous solution,slowly adding the compound IV aqueous solution into the product obtained in step 1), and performing coupling reaction at 10-40 DEG C for 2-3 hours; and 3) heating the obtained product, adding a cobalt salt, and performing complexation reaction at 50-95 DEG C for 2.5-4 hours, wherein the obtained reaction solution contains an organic cobalt complex. The organic cobalt complex prepared by the method provided by the invention has the technical advantages of reducing material consumption, shortening process flow and having a remarkable environmental protection effect.

The invention discloses a method for decomposing a phosphate rock acidolysis liquid by nitric acid to remove calcium byproduct alpha high-strength gypsum. The method comprises: decomposing phosphoriteby nitric acid, filtering out acid insoluble substances, partially neutralizing the acidolysis liquid, regulating and controlling the concentration of calcium ions in the acidolysis liquid, adding the acidolysis liquid into a crystallization tank containing a mixed solution of additional phosphoric acid and ammonium sulfate, controlling the reaction temperature to be 50-70 DEG C and the reactiontime to be 0.5-2 hours to firstly generate dihydrate gypsum, then, making the reaction slurry flow into a crystal transformation tank, and raising the temperature to 95 to 110 DEG C for reacting for aperiod of time so that an alpha-type high-strength gypsum product can be produced as a byproduct. According to the invention, the acidolysis liquid can be used for producing products such as fine phosphate, high-water-solubility phosphate fertilizer and the like, meanwhile, calcium resources in the acidolysis liquid are converted into an alpha high-strength gypsum product, solid waste phosphogypsum is changed into product phosphogypsum, environmental risks caused by the fact that a large amount of solid waste phosphogypsum is produced as a byproduct in the ammonium phosphate industry are eliminated, the phosphorus compound fertilizer industry is promoted to adjust the product structure, solid waste emission is reduced, and sustainable development of the phosphorus chemical industry is promoted.

The invention provides a drilling solid waste biodegradation device and a collected liquid collecting and recycling method thereof, and relates to the field of oil and gas exploration drilling solid waste biodegradation treatment. The device comprises a biological treatment mixture layer, a clean soil layer, a vegetation layer, a degradation stacking pool, an impermeable film, a liquid collectioncollecting pipe and a liquid guide pipe. The bottom of the degradation stacking pool comprises a groove with the inclination degree of 1%, a first liquid collecting face with the inclination degree of2-3% towards the groove and a second liquid collecting face with the inclination degree of 2-3% towards the groove. And the impermeable film completely covers the degradation stacking pool. The liquid collection collecting pipe with a first through hole in the pipe wall is mounted in the groove, one end of the liquid guide pipe is connected with the liquid collection collecting pipe, and the other end is higher than the surface of the degradation stacking pool. According to the method, the device is used, and the collected liquid in the liquid guide pipe is sucked and sprayed to the surface of the degradation stacking pool to be collected and recycled. The device has the beneficial effects that the collected liquid can be collected and reused, and degradation of drilling solid waste is accelerated.

The invention discloses a chemical waste salt separation and recovery system, and belongs to the field of industrial waste salt separation and recovery. The process comprises a sodium chloride waste salt calcining system, a sodium chloride tubular membrane system, a sodium chloride nanofiltration system, a sodium chloride evaporation system, a sodium sulfate waste salt calcining system, a sodium sulfate tubular membrane system, an ion exchange resin system, a sodium sulfate primary crystallization system and a sodium sulfate secondary crystallization system. The system comprises a sodium sulfate mother liquor tubular membrane system, a sodium sulfate nanofiltration system, a sodium sulfate ultrafiltration system, a waste gas treatment system and a carnallite drying system. Different types of industrial waste salt can be separated and recycled, resource utilization of the waste salt mainly containing sodium chloride and the waste salt mainly containing sodium sulfate is achieved, the cost of the hazardous waste treatment industry is reduced, the environmental protection problem is solved, and meanwhile certain economic value is created.

The invention provides a system and method for treating overhauling slag of an aluminum cell by cement kiln bypass incinerating. The system comprises an overhauling slag crushing system, a cement kilnbypass incinerating system, a conversion and dealkalizing system and a cement kiln resourceful treatment system which are sequentially connected. The method comprises the steps of S1, crushing and powdering the overhauling slag; S2, performing cement kiln bypass incinerating and disinfecting; S3, performing conversion and dealkalizing; and S4, performing resourceful treatment on a cement kiln. According to the system and the method, a suspension combined incinerating furnace is arranged at a cement kiln bypass; the crushed overhauling slag is incinerated under the conditions of high temperature, rich oxygen and long staying time, so that carbon materials in the overhauling slag can fully burn, and moreover, cyanide in the overhauling slag can be oxidized to remove the toxicity under high-temperature aerobic and alkaline conditions; the cinder obtained after incinerating of the overhauling slag is washed through alkaline liquid in order to be converted into a mineralizer containing fluorite for the cement kiln, and a caustic soda byproduct can be obtained, and as a result, the harmless, resourceful, ultimate and massive treatment of the overhauling slag of the aluminum cell can beachieved.

The invention discloses a styrene waste gas treatment device. The styrene waste gas treatment device comprises an absorption tower. A packing layer is arranged in the absorption tower, a styrene waste gas input pipeline is connected to the bottom of the absorption tower, a high-pressure draught fan is arranged on the styrene waste gas input pipeline, an exhaust gas emission pipeline is connected to the top of the absorption tower, an absorption liquid storage tank is arranged below the abortion tower, the bottom of the absorption tower is communicated with the absorption liquid storage tank, the absorption liquid storage tank is connected with the top of the absorption tower through an absorption liquid circulation pipe, and a circulation pump is arranged on the absorption liquid circulation pipe. By adopting the mode that a potassium permanganate solution is sprayed for absorbing styrene, styrene-containing waste gas generated by styrene materials in refinery enterprises on various occasions such as highway loading, wharf shipping and storage tank breathing can be simultaneously treated, and high treatment efficiency can be achieved; meanwhile, the process is simple, the occupied area is small, energy consumption is low, and the requirement of the newest national environmental protection standard for the styrene emission limit can be met.

The invention discloses a method for in-situ blocking and remediating heavy metal contaminated bottom mud. The method comprises the steps of dividing an area to be remediated into mesh units, arranging a sludge temporary storage tank, transferring the contaminated bottom mud in the mesh unit area into the temporary storage tank, fully mixing the contaminated bottom mud and a heavy metal stabilizing reagent in the temporary storage tank for reacting, and then returning to the original mesh unit area. Heavy metal diffusion blocking layers are arranged on the bottom part and the upper part of theoriginal mesh unit area, so that trace heavy metals released from the bottom mud are prevented from diffusing and migrating into underwater and surface water. Compared with traditional treatment technologies such as using the bottom mud for manufacturing building materials, and landfilling with the bottom mud, the method is beneficial to the effective inhibition of the dissolving and the releasing of the heavy metals in the bottom mud and the prevention of secondary pollution of the bottom mud, avoids the problem that the sludge is finally difficult to treat, has the characteristics of high treatment efficiency, investment and operation cost reduction, and the like, is suitable for remediating the heavy metal contaminated bottom mud of rivers, lakes and the like, and has higher popularization and application value.

The invention belongs to the technical field of hazardous waste treatment, and particularly relates to a drum-type water bath cleaning machine for a scrap iron drum treatment line, the drum-type water bath cleaning machine comprises a cleaning pool, a circulating device and a conveying table, and a control mechanism is arranged in the cleaning pool; according to the device, alkaline cleaning liquid is added into the cleaning pool, then through cooperation of the control mechanism and the cleaning mechanism, under the action of the alkaline cleaning liquid and the stirring assembly, iron bucket fragments in the cleaning bucket can be powerfully cleaned, and residual substances on the iron bucket fragments can be effectively removed; hazardous waste iron drum fragments are recycled, the harmless target of hazardous waste is ensured, the environmental risk in the recycling process is eliminated, through cooperation of the rotating mechanism, the stirring assembly and the adsorption assembly, the cleaning drum can be automatically replaced and conveyed, the automation degree is high, and the recycling efficiency is high. And the working efficiency is effectively improved, the labor cost is reduced, and accidents in the production process are reduced.

The invention belongs to the field of sludge treatment and particularly relates to a drying treatment system for treating the sludge from a domestic sewage plant. The sludge drying treatment system comprises a chemical dosing device and a stirring device, wherein the chemical dosing device comprises at least one chemical tank and at least one spiral conveyor; and the stirring device comprises a first-level stirrer, a scrapper and a second-level stirrer. According to the sludge drying treatment system provided by the invention, the automation degree is high, the links of dosing and stirring are integrally finished, and the production conditions of each link can be accurately controlled, thereby being safe and reliable; and moreover, main technological links are implemented in a closed plant, supporting tail gas treatment equipment is provided, and thus the system is friendly to the surrounding environment.