163results about How to "Meet the requirements of circular economy" patented technology

The invention discloses a high-melt strength polypropylene foam material and a preparation method thereof. The matrix resin of the foam material is high-melt strength polypropylene. The high-melt strength polypropylene foam material has the following characteristics: (1) the melt index (190 DEGC/2.16kg) is 1.0-10g/min; (2) the molecular weight distribution Mw/Mn is 6-20; (3) the content of the molecules with molecular weight over 5 million is greater than or equal to 0.8% by weight; and (4) (Mz+1)/Mn is greater than or equal to 70. The foam material is prepared by premix melting, blending and foaming of the following components in parts by weight: 100 parts of high-melt strength polypropylene and 1-15 parts of foaming agent. The obtained foam material meets the environmental protection requirements of degradability, uniform cell, high physical heat resistance, low production cost and smooth surface, and is suitable for continuous large-scale production.

The invention provides a method for producing products such as organic fertilizers, biological fertilizers, organic-inorganic compound fertilizers, plant breeding nutrient mediums, soil improvement materials and water retention materials by industrial chemical fermentation processing of residues from alcohol and starch processing by using tapioca. By the method, waste pollutants of chicken manure, pig manure, cow manure, sheep manure, sugar-refinery mud and the like are fully used, the comprehensive treatment and the recycling development of various organic resources are realized, and the problems for the technical treatment and the environmental influence of industrialized tapioca residues are effectively solved; and no three-waste emission occurs in the whole treatment process, the secondary pollution is avoided, and good economic benefits and social benefits are generated.

The invention provides a method for producing granular monoammonium phosphate with raffinate, wherein, ammonia is neutralized with phosphoric acid to obtain slurry, and the slurry is concentrated and then subjected to spraying granulation to obtain the granular monoammonium phosphate. The method comprises the following steps: (1) mixing wet-process phosphoric acid with the raffinate according to a certain ratio to obtain mixed phosphoric acid, and then lowering the metal ion content in the raw material mixed phosphoric acid; and (2) adjusting the neutralization degree of neutralization reaction between the mixed phosphoric acid and the ammonia to obtain monoammonium phosphate slurry. The granular monoammonium phosphate obtained by the method can meet the requirement for nitrogen nutrients in the product, reach the product strength of no less than 40N, digest the raffinate in a wet-process phosphoric acid purification device, conform to the requirement for the current global recycling economy. The method can improve the concentration of dilute phosphoric acid, reduce steam consumption of a slurrying system, and increase the product strength of the granular monoammonium phosphate.

The invention discloses an antistatic polypropylene foam material and a preparation method thereof. The foam material comprises the following blended components in parts by weight: 100 parts of high-melt-strength polypropylene, 0.1-2 parts of grapheme, 5-15 parts of a foaming agent, 0.125-0.25 parts of a compatilizer and 0.05-0.15 parts of a coupling agent. The method for preparing the antistatic polypropylene foam material comprises the following steps of: melting and blending according to the using amounts; molding and foaming.

The invention provides a polypropylene foamed bead. The foamed bead is prepared by foaming a base resin high-melt-strength polypropylene with a foaming agent, wherein the high-melt-strength polypropylene has the following characteristics: the melt index MFR is 0.2-10 g/10 minutes, the molecular weight distribution Mw/Mn is 6-20, the content of substances with the molecular weight of greater than 5 million is greater than or equal to 0.8 wt%, the M[z+1]/Mn is greater than or equal to 70, and the ethylene content is 0.1-20 wt%. The high-melt-strength polypropylene with wide molecular weight distribution is utilized as the raw material to implement stabilization of the polypropylene raw material, so that the foaming window is effectively enlarged, the technique is easy to adjust, and the cost is low; the method can be used for preparing the polypropylene foamed bead with the density of 0.02-0.3 g/cm<3>, which has the advantages of uniform pore diameter, compact pores, uniform pore size distribution and close-pore structure; and the polypropylene foamed bead can be widely used in the fields of thermal insulation tableware, automobile interior ornaments, architectural moldboards, camping supplies, decorating material interlayers, product damping packages and the like.

The invention provides a polypropylene foaming bead formed body and a preparation method thereof. The preparation method comprises the following steps: mixing polypropylene foaming beads having different foaming rates and prepared by using wide-molecular-weight-distribution high-melt-strength polypropylene as a raw material in proportion, and carrying out thermal molding of the above obtained mixed foaming beads to obtain the foamed body with good surface flatness and tight adhesion. The formed body can be widely applied to the heat insulation tableware field, the automobile interior decorative part field, the finishing material interlayer field, the product damping packaging field and the like. Additionally, the molded body can be recycled, causes no secondary pollution, and accords with circular economy requirements.

The invention discloses a comprehensive utilization method for wastewater of ammonium phosphate production. By distributing the wastewater, the wastewater is blended in other production links for recycling according to different ammonia nitrogen contents so as to realize zero emission. Condensed water generated by I-effect evaporation is relatively clean, and is delivered to a desalted water workshop to serve as supply water for desalted water of a boiler; and secondary steam generated by the I-effect evaporation is used in II-effect evaporation, condensed water is wastewater containing ammonia nitrogen, by adopting a treatment method of breaking up the whole into parts, a part of the wastewater is delivered to a tail gas washing system of a ammonium phosphate device and is added to serve as tail gas washing water, another part of wastewater is delivered to a circulating system of the ammonium phosphate device to serve as transmission equipment sealing water or adding water, and the other part of wastewater is delivered to a filter of the ammonium phosphate device to serve as filter cloth washing water. The method has the advantages of realizing zero emission of ammonia nitrogen wastewater of a large ammonium phosphate device, contributing to environmental protection, reducing process water quantity, realizing liquid-phase circular production, meeting the requirement of circular economy, and being suitable for the large ammonium phosphate device.

The invention discloses a fly ash activation regeneration composite filtration material and a manufacture method of the filtration material, belonging to the field of water treatment technique. The fly ash activation regeneration composite filtration material consists of 80 to 90 portions of fly ashes or furnace ashes (by weight) with the grain diameter not less than 80 meshes and 10 to 20 portions of porous aluminosilicate mixed powders (by weight); the fly ash or the furnace ash are bonded as grain shape with the granularity less than 8mm; the porous aluminosilicate mixed powders are enwrapped on the surface of the fly ashes or the furnace ashes and burned so as to form a ceramic layer which is provided with an adsorption micro-hole which is communicated with an internal core. The fly ash activation regeneration composite filtration material is fabricated and formed by the steps of raw material mixing, primary granulation, secondary granulation, drying, roasting, etc., and has the advantages of low cost and good purification effect.

The invention discloses a method for recycling a PTA oxidation residue. The method sequentially comprises the following steps: 1) mixing the PTA oxidation residue, water and an oil-phase extracting agent, pulping for 0.1-5 hours, and then extracting for 0.1-5 hours at 20-200 DEG C, so as to obtain a material of which a soil phase, an oil phase and a water phase are separated from one another; 2) respectively separating the solid phase, the oil phase and the water phase of the material obtained in the step 1); 3) rectifying the oil phase obtained in the step 2), respectively obtaining benzoic acid and p-toluylic acid, and recycling the rectified oil phase; 4) re-crystallizing the solid phase which is obtained in the step 2) to obtain a mixture of isophthalic acid and terephthalic acid; and 5) removing cobalt and manganese metal ions catalysts from the water phase which is obtained in the step 2), carrying out flash separation on aromatic acid, recycling the processed water phase. Through the method, a PTA oxidation residue system can be recycled; and the components of benzoic acid, isophthalic acid, terephthalic acid and p-toluylic acid can be recycled.

The invention discloses a sintered brick prepared by taking tailings as main raw materials and a preparation method of the sintered brick. According to the method, coal slime and coal gangue are doped into fine grained tailings according to a certain ratio to serve as raw materials, so that the content of SiO2 in the mixture is between 50 and 70 percent, the content of Al2O3 is between 6 and 20 percent, the content of CaO is lower than 6 percent, the content of MgO is lower than 6 percent, and the heating value is controlled to be 1.465-1.780MJ/Kg, and therefore, the mixture is reasonable in grading, and the requirements on plasticity and heating value needed by the sintered brick are met. The sintered brick and the preparation method thereof provided by the invention have the effects that the defects of the tailings, the coal slime and coal gangue respectively serving as raw materials of the sintered brick are overcome due to the mixture, the mineral composition and physical characteristics of the raw materials are optimized, comprehensive utilization of the fine grained tailings is realized, and the cost of the sintered brick is reduced.

The invention relates to a method for producing diammonium phosphate by using extract spent acid resulted from phosphoric acid purification. The method comprises the following steps: adding a modified frequency modulator on an extract spent acid conveying pump and ensuring the conveying amount of the extract spent acid to be constant; mixing the extract spent acid with common raw material phosphoric acid, and causing the content of sesquioxide in the complex acid to be lower than 3 percent; adding surfactant in the complex acid to increase the fluidity and the surface activity of a reaction slurry and reduce the viscosity of the reaction slurry; and according to a conventional method, using ammonia to neutralize the complex acid so as to obtain the diammonium phosphate. The method is a precedent in realizing the recovery of high-content impurity acid and the production of fine-quality diammonium phosphate products meeting national standards, when compared with a conventional process. The procedures in the method are unhindered, thereby being favorable for reasonably utilizing the phosphorus resource and conforming to the requirement of recycling economy. The method is suitable for enterprises producing the diammonium phosphate of purified phosphoric acid by using extracting agent.

The invention provides a polypropylene foam material and a preparation method thereof. The polypropylene foam material comprises matrix resin which is composed of, by weight, 30 to 70 parts of polypropylene with high melt strength, 10 to 50 parts of a polypropylene random copolymer and 5 to 30 parts of low-density polyethylene; and the polypropylene foam material further comprises, on the basis of 100 parts by weight of the matrix resin, 0.1 to 0.5 part by weight of a gas nucleating agent, 5 to 16 parts by weight of a physical foaming agent, 0.5 to 1 part by weight of an antioxidant and 1 to 10 parts by weight of a cell stabilizer. The polypropylene foam material provided by the invention has the advantages of good cell homogeneity, large cell density and no secondary environmental pollution.

The invention provides a flame-retardant thermoplastic polyurethane composition which comprises thermoplastic polyurethane base resin, a flame retardant and an optional antioxidant, wherein the flameretardant comprises a complex formed by phosphine oxide and a transition metal salt. Foaming beads prepared from the thermoplastic polyurethane base resin are dense and uniform in foam pores, and thecompression strength of a prepared foamed bead molded body is very high; meanwhile, when the thermoplastic polyurethane composition provided by the invention is used in cooperation with a specific flame retardant and a specific antistatic agent, the flame retardant and the antistatic agent can generate a synergistic effect, and meanwhile, the flame retardancy and the antistatic property are improved. The foaming beads prepared from the flame-retardant thermoplastic polyurethane composition disclosed by the invention have good low-temperature impact resistance, static resistance, flame resistance, simple and convenient process, high closed pore rate and controllable density.

The invention discloses a halogen-free flame-retardant polypropylene foam material and a preparation method thereof. The foam material comprises the following blended components in parts by weight: 100 parts of high-melt-strength polypropylene, 10-15 parts of phosphorus-series houghite and 3-15 parts of a foaming agent. The method for preparing the halogen-free flame-retardant polypropylene foam material comprises the following step of: melting according to the using amounts, blending and foaming. The foam material disclosed by the invention has the advantages of consistence with the environmental protection requirement, recyclability, non-crosslinking, uniform foam holes, high physical heat resistance, low production cost, smooth surfaces and suitability for continuous mass production.

The invention provides a flame-retardant polylactic acid composition which comprises polylactic acid base resin, a flame retardant, a cell nucleating agent and an optionally selected antioxidant, wherein the flame retardant comprises a complex formed by phosphine oxide and a transition metal salt. The foamed beads prepared from the polylactic acid base resin provided by the invention are dense anduniform in cell, and a prepared foamed bead molded body has a very high compressive strength; meanwhile, when the flame-retardant polylactic acid composition provided by the invention is used in combination with a specific flame retardant and a specific antistatic agent, a synergistic effect is achieved between the flame retardant and the antistatic agent, and at the same time, the flame retardancy and the antistatic properties are improved. The foamed beads prepared from the flame-retardant polylactic acid composition provided by the invention have the characteristics of excellent high-temperature impact resistance, antistatic properties, flame retardancy, simple process, high closed cell ratio and controllable density.

The invention provides a method for wastewater treatment by using a mechanical compression evaporation crystallizer system and belongs to the technical field of industrial wastewater treatment. A storage tank of the mechanical compression evaporation crystallizer system is connected with a balance tank which is connected with a tubular preheater, the tubular preheater is connected with an evaporation separation crystallization device and a condensation water tank, and the evaporation separation crystallization device is connected with a centrifugal separator which is connected with the storage tank. The treatment method includes: pretreated wastewater is pumped in the storage tank and enters a heat exchanger to perform heat exchange after buffering of the balance tank, material temperature rises by 5-8 DEG C, the wastewater enters the evaporation separation crystallization device to be evaporated and crystallized, high-speed separation is performed on crystal mush in a centrifugal machine, separated saturated solution returns to the evaporation crystallizer system again to be evaporated, and separated solid particles are packed. The method for the wastewater treatment by using the mechanical compression evaporation crystallizer system achieves effects regulated by the state of zero emission, circular economy and waste recovery, and evaporated distilled water can achieve the national first class discharging standard.

The invention provides polypropylene foaming expanded beads and a preparation method thereof. The foaming expanded beads take high-melt strength high-impact polypropylene as a basic resin, and are prepared by foamed impregnation; wherein, the high-melt strength high-impact polypropylene comprise a propylene homopolymer component and a propylene-ethene copolymer component, molecular weight distribution ratio of Mw to Mn is less than or equal to 10 and greater than or equal to 4; the ratio of Mz+1 to Mw is greater than 10 and less than 20; the content of a room temperature xylene soluble substance is greater than 10 weight% and less than 30 weight%; and the ratio of Mw of a room-temperature trichloro-benzenes soluble substance to Mw of a room-temperature trichloro-benzenes insoluble substance is greater than 0.4 and less or equal to 1 The polypropylene foaming expanded beads have the advantages of uniform size and distribution of foaming pore and aperture, high percentage of close area, good high/low temperature high-impact performance, and high melt-strength; and can be widely used for the fields of automobile part, food, electronic package and building decoration; the preparation method is simple, operation is easy, and the cost is low.

The invention discloses a composite foaming agent and a polypropylene foam material prepared from the same. The foaming agent comprises the following components in parts by weight: 100 parts of azodicarbonamide, 10-20 parts of N,N'-dimethyl-N,N-dinitrosoterephthalamide, 10-30 parts of zinc oxide and 10-30 parts of sodium citrate. The polypropylene foam material comprises the following blended components in parts by weight: 100 parts of high-melt strength polypropylene and 3-15 parts of composite foaming agent. The composite foaming agent disclosed by the invention has controllable foaming temperature, uniform foam cell, smooth surface and high physical heat resistance; and the polypropylene foam material prepared from the composite foaming agent meets the environmental protection requirement, is degradable and low in production cost, and is suitable for continuous large-scale production.

The invention discloses a method of producing triple superphosphate by using raffinate acid resulted from phosphoric acid purification. Affinate phosphoric acid serves as a raw material and additives are added. The method comprises steps of introducing steam so as to maintain the raffinate phosphoric acid temperature between 45 DEG C and 650 DEG C through measurement of a flow meter, adding phosphate rock powders in accordance with proportion, reacting the phosphate rock powders with the raffinate phosphoric acid for 2 to 3 minutes in a mixing device, enabling slurry to flow into a belt formation chamber for solidifying at the formation temperature of 80 DEG C for 20-25 minutes, stockpiling and curing the mixture, adding water to powder materials for granulating, drying and sieving the powder materials, and obtaining products. According to the method, the traditional art can be used for recycling phosphoric acid containing high impurities and the product such as triple superphosphate can reach national premium grade standard. The method has a smooth art process, is beneficial to utilize phosphorus resources reasonably, achieves usage of affinate phosphoric acid containing many impurities of purified phosphoric factories, and meets requirements of cycling economy.

The invention relates to a steam supplying device in the field of metallurgy, in particular to a steam supplying device of an RH vacuum refining furnace, which comprises a heat accumulator connected with a steam header of an evaporation cooling system of a converter, and a fuel gas type steam overheating device connected with the RH vacuum refining furnace; the steam inlet end of the heat accumulator is connected with the steam header of the evaporation cooling system of the converter; the steam outlet end of the heat accumulator is connected with the steam inlet end of the fuel gas type steam overheating device; and the steam outlet end of the fuel gas type steam overheating device is connected with the RH vacuum refining furnace. The steam supplying device fully utilizes steam produced by the converter; and secondary energy source is used in the steam supplying device of the RH furnace, thereby saving investment, reducing energy consumption, saving operating cost and meeting the requirement of circular economy.

The invention relates to a high-melt-strength anti-impact polypropylene foamed board. The foamed board is prepared through foaming with high-melt-strength anti-impact polypropylene as matrix resin. The high-melt-strength anti-impact polypropylene comprises a random copolymerization polypropylene continuous phase and a rubber dispersed phase of propylene-ethylene copolymer, wherein the content of room temperature dimethylbenzene soluble substances of the high-melt-strength anti-impact polypropylene is larger than 10 wt% and smaller than 35 wt%, and the ratio of Mw of room temperature trichlorobenzene soluble components to Mw of room temperature trichlorobenzene insoluble components is larger than 0.4 and smaller than 1. The invention further relates to a preparation method of the foamed material. The foamed material has higher melt strength, so foamed products with higher foaming ratio and better surface smoothness can be obtained, and the foamed material also has the characteristics of being high in rigidity, high in toughness and the like. Meanwhile, the foamed board has the advantages of being good in high-and-low-temperature anti-impact performance, high in physical heat resistance, high in percentage of close area, good in heat insulation and sound isolation performance, controllable in foaming ratio and foam pore structure and the like.