213 results about "Circular economy" patented technology

The invention relates to the technical field of preparation of porous carbon materials, in particular to a carbon material with an ultrahigh specific surface area and a preparation method and application thereof, and the preparation method comprises the following steps: ball-milling and mixing a carbon precursor and a chemical activator to obtain a homogeneous mixture; synchronously carbonizing and activating the homogeneous mixture to obtain a carbonized compound; washing and drying the carbonized compound to obtain a carbon material with an ultrahigh specific surface area; the carbon precursor is waste phenolic resin. The waste phenolic resin is efficiently converted into the high-specific-surface-area porous carbon material (super activated carbon) through ball-milling-assisted homogenization and a synchronous carbonization / activation process, and the method has remarkable advantages in the aspects of environmental protection, process efficiency, material performance, application value and the like, not only solves the problem of thermosetting resin recovery, but also improves the recovery efficiency of the thermosetting resin. And the waste resin is converted into a high-added-value carbon material, so that the development of circular economy is promoted, and the dual-carbon strategic target is met.

The invention relates to a strengthening treatment and automatic separation system for construction waste recycled aggregate, and innovatively provides a technical route of'multistage crushing, magnetic separation, winnowing, flotation linkage and aggregate strengthening 'aiming at the core problems of more impurities and low strength of the recycled aggregate. The system comprises a pretreatment module (for removing large impurities), a multi-stage crushing module (for controlling grain shapes), a linkage sorting module (for removing plastics through winnowing, removing wood chips through flotation and carrying out photoelectric precise sorting), an aggregate strengthening module (for improving strength through microwave activation and nanometer coating) and an intelligent control center. By establishing a magnetic separation efficiency model, a grain shape optimization model and a strength prediction algorithm, the aggregate purity is greater than 98% (XRF detection), and the compressive strength is improved by 40% (ISO 679 verification); the energy consumption in the sorting link is reduced by 30%, and the reinforced aggregate can replace natural aggregate to prepare C40 concrete. The bottleneck of high-value utilization of the construction waste is broken through, and circular economy development is promoted.

The invention relates to the technical field of supply and demand management, in particular to a circular economy-oriented material supply and demand dynamic matching and demand prediction platform, which comprises a source data cross fusion module, a feature mapping module, a circular deduction module, a resource benefit prediction module, an efficiency dynamic arrangement module and an executable order generation module, performing source data cross fusion on the original material supply list and the demand list to obtain fused data; performing feature mapping on the fused data to obtain supply and demand feature vectors; performing full-life-cycle cyclic deduction on the supply and demand feature vectors to obtain a potential cyclic path map; performing resource benefit prediction on the potential circulation path map to obtain a benefit influence index; performing global efficiency dynamic arrangement on the potential supply-demand relationship to obtain an optimized matching sequence; performing priority ranking on the optimized matching sequence to obtain an instant executable order; according to the invention, the efficiency of reference information generation of the circular economy-oriented material supply and demand dynamic matching and demand prediction platform can be improved.

The invention relates to a high-temperature acidolysis reaction defluorination method, and belongs to the technical field of phosphorus chemical resource recycling. The technical problem to be solved by the invention is to provide a high-temperature acidolysis reaction defluorination method which is simple to operate and high in defluorination rate. According to the method, phosphorite powder / white fertilizer is subjected to high-temperature acidolysis, fluoride in the phosphorite powder / white fertilizer reacts with strong acid, fluorine is separated from a reaction system in a gas form, and hydrofluoric acid is obtained through condensation. The method is simple, is simple and convenient to operate, and is easy to realize technologized large-scale production. Meanwhile, due to the destructive effect of the strong acid on the lattice structure of the phosphorus-calcium compound, citrate-soluble phosphorus can be converted into soluble phosphate, subsequent phosphorus recovery is facilitated, comprehensive utilization of phosphorite and elimination of white fertilizer output are achieved, meanwhile, the problems of material accumulation and resource waste of enterprises are solved, and the method conforms to the circular economy concept of green development.

The invention belongs to the technical field of refractory materials, and particularly relates to a mullite refractory material with high mechanical property and a preparation method thereof. The mullite refractory material is prepared by taking coal gangue, bauxite and fly ash as raw materials, and the three industrial solid wastes are converted into the refractory material with high additional value, so that the concept of circular economy is met. According to the invention, coal gangue, bauxite and fly ash are used as raw materials, CaF2, V2O5 and lanthanide rare earth oxide are used as sintering aids, the problems of insufficient mechanical properties and overhigh sintering temperature of the mullite refractory material prepared by purely using coal gangue, bauxite and fly ash as raw materials are solved, and the performance of the mullite refractory material can be greatly improved. CaF2 and V2O5 promote substance transport and grain growth, and rare earth oxide inhibits excessive growth of grains. The balance of'promotion 'and'inhibition' is favorable for forming a compact, fine, uniform and interlaced mullite crystal network, and meanwhile, the mullite crystal network has high strength and good toughness.

The invention discloses a method for preparing foamed ceramic through low-temperature sintering and a product prepared through the method, and the foamed ceramic with pyroxene minerals as a main crystal phase is prepared through low-temperature sintering through silicon carbide-desulfurization slag composite foaming, szaibelyite fluxing and crystal phase regulation and control. Therefore, the composite closed pore system foaming ceramic material with high mechanical property and closed pore property is obtained. Low-cost minerals and solid wastes are adopted as main raw materials, so that the production cost of the foamed ceramic is effectively reduced, and a solid foundation is laid for large-scale industrial application of the foamed ceramic; meanwhile, efficient resource utilization of solid waste is achieved, remarkable economic and environmental benefits are achieved, and the method plays an important role in promoting industrial circular economy development and ecological environment treatment.

The invention discloses a waste tire sorting and conveying system and a cracking produced gas recovery process thereof, the system comprises a tire classification module, a tire surface defect judgment unit, a repair priority processing module and a tire priority conveying module, and the tire classification module divides size according to tire diameter data and classifies materials in combination with cord thread magnetic attraction characteristics; the tire surface defect judgment unit analyzes and judges tire surface defect data by referring to the tire repair index database; the repair priority processing module constructs a multi-dimensional evaluation matrix to obtain a tire repair priority; and the tire priority conveying module scores, judges and distributes conveying queues according to the repair priority, so that the conversion from extensive recovery to refined classification and high-valued utilization of the waste tires is realized, the problems of low efficiency and high wrong classification rate of traditional manual sorting are solved, key support is provided for large-scale and intelligent operation of a waste tire circular economy industrial chain, and the economic benefit of the waste tires is improved. And the raw material quality and the treatment efficiency of a subsequent recycling process are ensured.

The invention relates to a coal gangue-based temperature control and humidity control material for 3D printing and a preparation method thereof, two wastes of coal gangue and camellia oleifera shells are taken as main raw materials, the purpose of treating wastes with wastes is realized, the concept of circular economy is met, and the cost is low. Rapid hardening is achieved through calcium formate, rheology controllability is achieved through a rheology modifier, and the core problems of the 3D printing material in the aspects of printability and early strength are successfully solved. The functions of temperature control (phase change microcapsules) and humidity regulation (air entraining-fiber porous system) are integrated in a printing material, so that a printed building component becomes an intelligent environment regulator. Due to the addition of the camellia oleifera shell fibers, humidifying is assisted, the reinforcing and toughening effects are achieved, and the integrity and long-term durability of a printed component are improved.

A system, apparatus, and method is provided for recommending actions to enable circular economy framework across lifecycle of product including components in industrial environment. The method including determining, by processing unit, features for a given phase of lifecycle of product based on information associated with unique identifier of product. The information is stored in knowledge graph including semantic information pertaining to product, components of product, properties of components of the product and behavior of components of the product at each lifecycle phase of product. The method includes determining performance indicators pertaining to circular economy framework in industrial environment based on features from knowledge graph for given phase of lifecycle of product. The method includes recommending actions for given lifecycle phase of product such that determined one or more performance indicators are within predefined range enabling circular economy framework in industrial environment.

The invention relates to the technical field of plastic forming, and discloses a plastic leftover material forming process of a layered compaction structure, which comprises the following steps: S1, raw material pretreatment: selecting a new plastic material meeting performance requirements, drying, mixing with pretreated recycled material particles in proportion, uniformly stirring, and feeding into a raw material storage tank for later use; s2, melting and injection molding: feeding the mixed raw materials into an injection molding machine, heating in different areas through a charging barrel, and stirring and melting into a melt through a screw rod; the die set is arranged, through an immediate leftover material separation and recovery system, the cut leftover materials can be rapidly recycled, soil and water pollution caused by leftover material accumulation is avoided, meanwhile, waste of plastic raw materials is reduced, and the development concepts of green manufacturing and circular economy are met. Due to the sealing protection design of the die set, pollution caused by melt leakage is avoided, and diffusion of dust and harmful gas is reduced through the sealing structure of the movable groove.

A kind of pneumatic friction irregular plant root block complete shape peeling machine relates to a kind of pneumatic friction peeling machine mainly by screw bin 1, auger 2, bubble bin 3, inlet hopper 4, discharge chute 5, water inlet pipe 6, motor 7, air pump 8, slag discharge pipe 9, rack 10, abrasive 11 are constituted, using the invention can keep irregular plant root block and fruit after cleaning and peeling have relatively complete shape, the advantage of using the invention: one is to realize the mechanical shape of such as yam and other root food peeling cleaning, make it after cleaning beautiful and complete, keep nutrient substance;Two is to liberate from the traditional through artificial irregular crop peeling from tedious simple repetitive operation, adopt mechanical processing, greatly improve the efficiency of peeling, provide the possibility for industrialized planting processing;Three is to concentrate mechanical peeling, facilitate intensive management, peeling waste can be recycled, develop circular economy, protect green mountains and clear water;Four is to provide implementation approach for peeling processing intelligent operation, ecological treatment;Five is invention manufacturing is convenient, manufacturing cost is low, use, operation, maintenance is convenient.

Provided is a continuous process for converting waste plastic into recycle for polypropylene polymerization. The process comprises selecting waste plastics containing polyethylene and / or polypropylene and preparing a stable blend of petroleum and the selected plastic. The amount of plastic in the blend comprises no more than 20 wt. % of the blend. The blend is passed to a refinery hydrocracking unit. A liquid petroleum gas C3 olefin / paraffin mixture is recovered from the hydrocracking unit. The C3 paraffins and C3 olefins are separated into different fractions with the C3 olefin fraction passed to a propylene polymerization reactor, and the C3 paraffin fraction passed optionally to a dehydrogenation unit to produce additional propylene. A heavy fraction can also be recovered from the hydrocracking unit and passed to an isomerization dewaxing unit to prepare base oil.

The invention discloses a copper-tungsten alloy waste cleaning and recycling method based on hydrogen reduction, belongs to the technical field of non-ferrous metal waste cleaning metallurgy and resource circulation, and aims at solving the problems that a traditional recycling method is high in energy consumption, complex in process, heavy in secondary pollution, difficult to consider both the metal recycling rate and the metal purity, large in high-temperature operation safety risk and the like. According to the method, the tungsten-copper alloy waste is sequentially subjected to primary crushing, oxidation, primary reduction, separation, secondary reduction, screening, tertiary reduction, secondary crushing, airflow pulverization, acid pickling and impurity removal and other procedures, cooperative operation is carried out in cooperation with special equipment such as an oxidation reaction tank and a reduction reaction kettle, and meanwhile mixture separation and a hydrogen internal circulation system are integrated; efficient cleaning, separation and extraction of tungsten and copper are achieved, and the energy utilization and resource circulation level is improved. Tungsten and copper are separated thoroughly, the product purity is high, energy consumption is low, the metal recovery rate is high, no three wastes are discharged in the whole process, the green low-carbon circular economy concept is met, the recovery rate of the obtained tungsten powder and copper powder is larger than or equal to 99%, the oxygen content is smaller than 0.05 wt%, and the particle size uniformity is excellent.

The invention relates to the technical field of renewable energy utilization, and discloses a biomass energy circular economy system based on a multi-stage partner system and an operation method, and the system comprises a resource integration module which is used for obtaining a biomass raw material from an upstream partner; the energy and product conversion module is used for converting the biomass raw material into at least one energy product and at least one substance byproduct; the value circulation module is used for processing the substance byproducts into value-added products; and the multi-stage partner collaborative management module is used for carrying out whole-process resource collaboration, benefit distribution and cooperative relationship management on upstream partners, downstream partners and system operation related parties. According to the invention, a stock right binding mechanism based on a contribution value evaluation model is constructed, the cooperation value of the upstream raw material supplier can be accurately quantified, the long-term income right is given to the upstream raw material supplier, and the design realizes the relationship transformation from short-term buying and selling to long-term symbiosis with the raw material supplier.

The utility model discloses an ecological homestay of waste storage tank recycling, which comprises a horizontal base plate I, a contact surface formed on the bottom surface of the horizontal base plate I for contacting with the water bottom, a waste storage tank with the top part exposed above the water surface, the bottom outer circumferential surface of the waste storage tank fixed on the top surface of the horizontal base plate I, a waste container fixed on the top part of the waste storage tank, a horizontal base plate II horizontally fixed on the top part of the waste container, a top surface of the horizontal base plate II forming a crop planting space, a personnel passing opening formed between the horizontal base plate II and the waste container, a staircase installed between the personnel passing opening and the bottom inner wall of the waste container, and personnel in the personnel activity space reaching the crop planting space through the staircase. The waste storage tank, the waste container and the staircase of the ecological homestay are all made of waste industrial articles for recycling, which turns waste into treasure. The recycling economy and the environmental protection concept reduce the consumption of new materials and the construction cost.

The application discloses a kind of module variable distance punching device technologies of stepless adjustment, it is characterized by: using groove to realize the method of dismounting and installing punching part, adjusting the number of holes, distance, punching part, punching main body are independent of each other, punching part, fixed plate, pressing plate are independent of each other, punching part has groove, pressing plate, fixed plate have groove, punching part has concave-convex pattern up and down, can be dismounted from pressing plate, fixed plate, install, adjust hole distance using groove pattern.The application has the outstanding advantages of simple and practical, easy to promote, large-scale production.Can adjust the hole distance, hole diameter, hole number according to the specification of paper, realize stepless adjustment, general punching device technology, the hole distance that can be adjusted can be accurate to millimeter, can realize the adjustment of multiple holes simultaneously, part damage can replace parts, can be recycled, improve resource utilization, significantly prolong the overall service life of product, reduce the generation of solid waste, meet the development requirements of green environmental protection and circular economy.

The invention belongs to the technical field of waste acid treatment, and particularly relates to an efficient concentration process for waste acid in phenylenediamine production. According to the high-efficiency concentration process for the waste acid generated in phenylenediamine production, multi-stage concentration and resource recycling are combined, impurities are removed through pretreatment of the composite adsorbent, and the adsorbent is recycled and regenerated through magnetic separation; according to the invention, waste acid is extracted from 70-75% to 95.5-96% through first-stage vacuum concentration, second-stage vacuum concentration and pot-type three-stage concentration, and the waste acid can be reused in a second-stage nitrification process, so that cyclic utilization is realized, and the consumption of raw materials is reduced. According to the process, pot-type concentrated high-temperature tail gas is used as a first-stage vacuum concentration heat source to recover waste heat, and external energy consumption is reduced; diluted acid water is separated through a pervaporation membrane, recycled water is used for washing, concentrated dilute acid is recycled for pretreatment, closed cycle emission reduction is formed, and the requirements for green, low carbon and circular economy are met. Meanwhile, by means of composite adsorbent magnetic separation, corrosion-resistant material application and an efficient composite membrane technology, the system stability and efficiency are improved, the service life of equipment is prolonged, and the maintenance cost is reduced.

To provide an ink container made of biomass plastic that has improved strength against impacts such as dropping the ink container. [Solution] The ink container of the present disclosure is an ink container for supplying ink to an ink dispensing device, the ink container having an ink storage section for storing the ink and a dispensing section for dispensing the ink stored in the ink storage section, wherein the ink storage section has (a) a first region and a second region and a main body region sandwiched between the first region and the second region, (b) the first region and the main body region, or (c) the second region and the main body region, the main body region comprising a first resin derived from biomass, and the first region and the second region comprising a second resin derived from fossil fuels. The technology of the present disclosure can contribute to the realization of a sustainable society such as a decarbonized / circular economy.

The invention relates to the technical field of carbon dioxide adsorbents, in particular to a silicon-based / aluminum-based solid amine adsorbent prepared from montmorillonite and a preparation method and application of the silicon-based / aluminum-based solid amine adsorbent. According to the invention, the montmorillonite subjected to acid activation treatment is extracted to obtain the silicon-based nano material with silicon dioxide as a main component. In addition, through step-by-step neutralization treatment on the strongly acidic filtrate, metal ions in the filtrate are successfully extracted and converted into an aluminum-based nano material with aluminum oxide as a main component. The solid amine adsorbent is prepared by taking a silicon-based and aluminum-based composite nano material with high specific surface area and high surface activity as a carrier and combining amino functionalization treatment. According to the method, high-added-value overall utilization of the montmorillonite is achieved, the montmorillonite is converted into a high-capacity and high-selectivity novel trapping material from low-adsorbability minerals, the original acid filtrate with high corrosivity is converted into an environment-friendly sodium chloride neutral solution, and green chemistry and circular economy concepts are practiced.

The application discloses a carbon dioxide recovery and efficient utilization device and belongs to the technical field of agricultural wastes, comprising an aerobic fermentation tank; a multistage spraying system for removing ammonia and hydrogen sulfide is connected to a gas outlet end of the aerobic fermentation tank; a double-membrane gas holder buffer unit for storing gas is connected to an output end of the multistage spraying system; a gas sending fan is connected to a gas outlet end of the double-membrane gas holder buffer unit; and a farmer's greenhouse is connected to an output end of the gas sending fan through a pipeline. The application recovers carbon dioxide by using fermentation tail gas, and farmers only need to bear pipeline construction and a small amount of operating electricity cost, so that the cost is greatly reduced, a recycling utilization mode of 'waste gas into green carbon' is formed, multiple goals of tail gas deodorization, carbon emission reduction and agricultural yield increase are realized, the development concept of circular economy and green agriculture is met, the combination of planting and breeding circular agriculture is promoted, and the agricultural science and technology level is improved.

The invention discloses a surface coating of a hot magnesia spinel brick and a preparation method of the surface coating. The surface coating comprises the following components in percentage by weight: 40-70% of an aggregate system, 28-50% of a binding system, 1-5% of a sintering aid and 1-5% of an additive, wherein the aggregate system comprises the following components in parts by weight: 30-50 parts of magnesium spinel brick regenerated powder and 10-20 parts of functional fine powder; the combination system comprises the following components in parts by weight: 10-20 parts of activated aluminum oxide micro powder, 5-15 parts of light calcined magnesia powder and 3-8 parts of silicon micro powder. The coating forms a firm chemical bonding interface, the bonding strength is obviously higher than that of a traditional normal-temperature coating, and the anti-stripping capacity is greatly improved; the waste brick is used as the raw material, the cost is reduced, the circular economy concept is met, the service life of the brick body is prolonged, the replacement frequency is reduced, and energy and cost are saved.

The application discloses a green separation and extraction process for a waste lithium iron phosphate battery cathode material, relates to the technical field of resource utilization and circular economy of waste lithium ion batteries, and comprises the following steps: adding water to waste lithium iron phosphate battery cathode powder material to form a slurry, adding a sodium hydroxide solution to the slurry to perform an alkali leaching reaction under the condition of 60-80 DEG C, selectively leaching phosphate, performing solid-liquid separation after the reaction, and obtaining a dephosphorized solid and a phosphorus-containing leaching mother liquor; and the dephosphorized solid is washed and then enters an oxidation pretreatment procedure; in the application, the reaction activity is strengthened through pretreatment, the phosphate is preferentially separated and recovered as a high-value sodium phosphate product through selective alkali leaching, the iron valence state is stabilized through oxidation pretreatment, the iron is selectively precipitated through acid leaching and pH regulation, and the iron is further calcined into iron oxide, deep impurity removal and selective lithium precipitation ensure efficient extraction and high purity of battery-grade lithium carbonate, and the closed-circuit circulation and shunt desalination mechanism of the washing liquid and the mother liquor in the process reduce reagent consumption and wastewater discharge.

This invention provides a comprehensive utilization process for agricultural solid waste, relating to the field of agricultural solid waste comprehensive utilization and treatment technology, including the following steps: S1: inoculation and transplanting of arbuscular mycorrhizal fungi (AMF) inoculants; S2: solid-liquid separation and resource utilization of livestock manure; S3: nutrient solution circulation and inoculant recovery; S4: preparation of second-generation inoculant. This invention achieves the synergistic treatment and comprehensive utilization of livestock and agricultural waste, effectively solving the problems of high disposal costs, low resource utilization, and environmental pollution associated with traditional agricultural waste disposal. Simultaneously, it breaks through the technical bottlenecks in the commercial production and application of mycorrhizal fungi, constructing an AMF inoculant recycling system, significantly increasing the yield of AMF / microorganisms and organic fertilizer, reducing usage costs, and forming a green circular economy system for planting and breeding through nutrient solution recycling and inoculant cyclic propagation, reducing the use of chemical fertilizers and pesticides, and achieving cost reduction, efficiency improvement, emission reduction, and quality enhancement.

The invention relates to a low-carbon concrete preparation method based on low-temperature pyrolysis fly ash. The low-carbon concrete is prepared from the following raw materials in parts by weight: 250 to 270 parts of cement, 105 to 125 parts of modified fly ash, 550 to 570 parts of quartz sand, 130 to 150 parts of fly ash-based glass body, 1000 to 1200 parts of stone, 6 to 10 parts of functional additive, 10 to 20 parts of nano filler, 20 to 30 parts of composite expanding agent, 3 to 6 parts of retarder, 5 to 10 parts of hydroxypropyl methyl cellulose ether, 1 to 2 parts of polyoxyethylene polyoxypropylene ether and 170 to 200 parts of water. The prepared low-carbon concrete not only has excellent impermeability and corrosion resistance, but also has good mechanical properties and durability, the service life of the low-carbon concrete is effectively prolonged, meanwhile, carbon emission and energy consumption brought in the concrete preparation process are reduced, high-added-value resource utilization of solid waste is achieved, and the method is suitable for industrial production. And the circular economy concept is met.

The invention relates to the technical field of ferrous metallurgy, in particular to a converter steelmaking method based on waste steel replacement and dynamic regulation, which comprises the following steps: using a self-circulation iron-containing material as a cold material to replace outsourcing waste steel; the self-circulation iron-containing materials comprise channel line slag steel generated by splashing of a converter, sintered slag steel formed after red slag generated at the converter blowing end point is subjected to magnetic separation through a steel slag treatment line, and iron sheet balls pressed by oxide scale generated in a steelmaking workshop; and top-bottom combined blowing process parameters of the converter are optimized. The method has the advantages that a large amount of self-circulation iron-containing materials of road line slag steel, sintered slag steel and iron sheet balls generated in enterprises are used for directly replacing outsourcing waste steel with high price, and the raw material purchasing cost is greatly reduced; efficient resource recycling of iron-containing solid waste in the steel mill is achieved, waste is turned into wealth, the solid waste discharge treatment cost is reduced, and the requirements of circular economy and clean production are met; through the matching process optimization of strengthening top and bottom combined blowing, the stirring of a molten pool and the slag-gold reaction efficiency are improved, and splashing is inhibited.

The invention discloses a bio-based composite material, a preparation method and application, and belongs to the field of composite material preparation, the bio-based composite material comprises the following components by mass: 35-55 parts of a petroleum-based polymer base material, 5.25-16.5 parts of petroleum-based polymer leftover waste, 1.75-16.5 parts of biomass fiber, and 30-45 parts of an auxiliary material. According to the bio-based composite material, the preparation method and the application, a single waste material recovery or biomass addition mode is broken through, leftover material regeneration and a biomass fiber system are innovatively compounded, a composite material system of waste material regeneration and biomass compounding is constructed, the concept of circular economy and bio-based substitution is fused at the source of material design, and the composite material has a wide application prospect. A brand new design thought is provided for developing green products, and green growth of the industry is promoted.

Provided is a continuous process for converting waste plastics into polyethylene for recycling. In one embodiment, the process includes selecting waste plastics containing polyethylene and / or polypropylene and passing the waste plastic through a pyrolysis reactor to thermally decompose at least a portion of the polyolefin waste and produce a pyrolyzed effluent. The pyrolyzed effluent is separated into off-gas, a naphtha / diesel fraction, a heavy fraction, and char. The naphtha / diesel fraction is passed to a refinery crude unit distillation column, from which a straight-run naphtha (C5-C8) fraction or a propane / butane (C3-C4) fraction is recovered. The straight-run naphtha fraction (C5-C8) or a propane / butane (C3-C4) fraction is passed to a steam cracker for ethylene production. The heavy fraction from the pyrolysis unit can also be passed to an isomerization dewaxing unit to produce base oil.

Provided is a continuous process for converting waste plastic into recycle for polyethylene polymerization. The process comprises selecting waste plastics containing polyethylene and / or polypropylene and preparing a blend of petroleum and the selected plastic. The amount of plastic in the blend comprises no more than 20 wt. % of the blend. The blend is passed to a refinery hydrocracking unit. A liquid petroleum gas C3-C4 olefin / paraffin mixture, and optionally naphtha, is recovered from the hydrocracking unit and passed to a steam cracker to make ethylene A heavy fraction can also be recovered from the hydrocracking unit and passed to an isomerization dewaxing unit to prepare base oil.

Provided is a continuous process for converting waste plastic into recycle for polypropylene polymerization. The process comprises selecting waste plastics containing polyethylene and / or polypropylene and preparing a stable blend of petroleum and the selected plastic. The amount of plastic in the blend comprises no more than 20 wt. % of the blend. The blend is passed to a refinery FCC unit. A liquid petroleum gas C3 olefin / paraffin mixture is recovered from the FCC unit. The C3 paraffins and C3 olefins are separated into different fractions with the C3 olefin fraction passed to a propylene polymerization reactor, and the C3 paraffin fraction passed optionally to a dehydrogenation unit to produce additional propylene.

The invention relates to a method and system for cooperatively treating fluorine-containing wastewater by using steel slag, and the method comprises the following steps: adding a fluorine removal agent into the fluorine-containing wastewater, and carrying out preliminary coagulation to form a first fluorine-containing mixed solution; adding steel slag into the first fluorine-containing mixed solution, and stirring to form a second fluorine-containing mixed solution; adding a flocculating agent into the second fluorine-containing mixed solution, and carrying out flocculation treatment; and precipitating the mixed solution subjected to flocculation treatment to realize mud-water separation. By means of the efficient adsorption performance of the steel slag on fluoride and the chemical precipitation effect of active ingredients such as calcium and magnesium contained in the steel slag and fluorine ions, the treatment effect of a conventional fluorine removal technology is doubly enhanced. And moreover, the steel slag is recycled to replace part of the defluorination agent, so that the agent consumption cost is remarkably reduced, and the total amount of solid waste which finally needs to be treated is reduced as the steel slag participates in the treatment process as solid waste, so that the circular economy concept of treating waste with waste is really realized.