35results about How to "Alleviate the pressure of shortage" patented technology

The invention provides a straw feed and a preparation method thereof, relating to the technical field of environmental protection, in particular to a straw fermentation fungicide and preparation thereof. The method comprises two steps of aerobic fermentation and one step of anaerobic fermentation to prepare the straw feed, and specifically comprises the steps of crushing straws; preparing mixed bacteria liquid of aerobic degraded cellulose so as to conduct the aerobic fermentation on straw powder; preparing mixed fermentation bacteria liquid to conduct the aerobic fermentation on the straw powder; preparing lactic acid bacteria liquid so as to conduct the anaerobic fermentation on the straw powder; and drying the fermented straw feed and pelletizing. The method improves the utilization ratio of lignin, cellulose and hemicellulose in straws, crude protein contents in a fermented product are increased, and the straw is converted into a super poultry feed.

The invention discloses an urban miniature underground reservoir. The underground reservoir is composed of multiple water storage ponds which are buried underground and connected with municipal administration rainwater drainage pipelines, and the miniature reservoir is located below urban road auxiliary roads and green belts. Rainwater on the roads and the peripheries of the roads can flow into the reservoir through drainage pipes, and when it rains, the rainwater can flow into the miniature reservoir through the drainage pipes to be stored; as tiny holes are formed within the range above the one fourth to one third portion of the side face of the reservoir, water in the miniature reservoir can slowly permeate into a foundation soil body to supplement underground water and improve the underground water environment. The invention further discloses a construction method for the miniature underground reservoir. The miniature underground reservoir can relieve pressure of the municipal administration rainwater drainage pipelines, improve the municipal water use capacity, supplement the underground water and improve the underground water environment, and therefore the miniature underground reservoir has large social benefits and high ecological value.

The invention discloses sand-base composite soil. The composite soil is prepared by mixing Paleozoic and Mesozoic sedimentary rock and sand in a volume ratio of 1:(1-5), wherein the particle size of the Paleozoic and Mesozoic sedimentary rock is 2 to 4 centimeters; or mixing Paleozoic and Mesozoic sedimentary rock and sand in a volume ratio of 1:(1-3), wherein the particle size of the Paleozoic and Mesozoic sedimentary rock is 3 to 4 centimeters. The sand-base composite soil disclosed by the invention has high permeability and water-retaining property; the physical and chemical properties of the sand-base soil are equivalent to those of soil; and when the composite soil is used for growing plants, the yield of the plants may reach that of crops grown in common soil. The invention provides an effective method for turning sandy lands into cultivated lands, and provides an effective means for relieving pressure caused by land source shortage.

The invention discloses a cinder powder magnesium oxysulfate cement stabilized recycled concrete aggregate, which comprises uniformly mixed components with the following mass content: 93%-97% recycled concrete aggregate, 1.56%-3.12% oxidized Magnesium, 0.57%-1.90% cinder powder, 0.76%-1.80% magnesium sulfate, and 0.09%-0.18% water-resistant additive. The invention also discloses a preparation method of the above-mentioned cinder powder magnesium oxysulfate cement stabilized recycled concrete aggregate. The cinder powder magnesium oxysulfide cement stabilized recycled concrete aggregate of the present invention has the characteristics of convenient material acquisition, energy saving and environmental protection, and is a new type of building material; it uses a large number of solid wastes such as waste concrete, cinder, bischofite, etc., and can solve the problem of The environmental protection and land occupation problems caused by waste concrete and cinder, as well as the relief of the increasingly scarce sandstone and cement resources, and the expansion of the application range of magnesium oxysulfate cement have far-reaching influence and broad application prospects; and its unconfined compressive strength Meet the specification requirements, can speed up the progress of the construction.

The invention belongs to the field of waste heat recovery devices, and relates to a device for recovering waste heat of living hot water and production hot water such as water in swimming pools, bathing water and water for factories, in particular to a high-efficiency heat recovery unit for waste hot water. The high-efficiency heat recovery unit for waste hot water comprises a waste water processing device, a first-stage heat recovery device and a second-stage heat recovery device. Through the waste water processing device, the first-stage heat recovery device and the second-stage heat recovery device, the waste heat utilization efficiency can be greatly improved, cost can be greatly reduced for residents, factories, hospitals, schools, bathing, business and other places needing hot water, and the pressure of energy shortage in China is relieved. In addition, the high-efficiency heat recovery unit for waste hot water is applicable to large-scale production and convenient to operate.

The invention belongs to the technical field of pharmaceutical preparation, and provides a method for removing impurities from gentamicin. The method is characterized by comprising the following steps of: diluting a gentamicin concentrated solution, adjusting the pH value, slowly adsorbing the gentamicin concentrated solution to a weak-acidity cation exchange resin column, then adding ammonia water for washing and removing the impurities, slowly desorbing the gentamicin by the ammonia water, and performing vacuum concentration, sulfuric acidification, activated carbon decoloration and spray drying on the desorbed solution. According to the method, the yield is up to 65% or so, and the quality of a product is improved; the product which meets the quality requirement of a new pharmacopeia is obtained; and the pressure of short supply of high-quality gentamicin in the existing market is relieved to a certain extent.

The invention belongs to the technology for comprehensive recycling of complex secondary non-ferrous metal resources, and particularly relates to an enrichment and separation method for chromium elements in a discarded circuit board multi-metal mixed resource. The method includes the steps that firstly, after discarded circuit boards are crushed and separated, a multi-metal complex mixture containing the chromium elements is obtained; a trapping agent is added into the multi-metal complex mixture, and the prepared multi-metal complex mixture is placed in a graphite crucible of a vacuum furnace; after the multi-metal complex mixture is completely melted, a trace amount of enrichment reagent phosphorus is added, the separation rate of liquid copper and liquid iron is adjusted, and the chromium elements are enriched into a liquid iron phase so that separated melt with the upper layer being the liquid iron and the lower layer being the liquid copper can be formed; and the upper layer liquid iron with the trapped chromium elements is poured out. Accordingly, the chromium elements are separated from the multi-metal complex mixture of the discarded circuit boards and are further recycled. The method is simple and easy to implement and has the characteristics of being low in cost, comprehensive, efficient, free of pollution and the like.

The invention belongs to the comprehensive recycling technology of a complex secondary resource of non-ferrous metal, in particular to a method for enriching and separating bismuth elements in a polymetallic mixed resource of waste printed circuit boards. The method comprises the following steps: firstly, after the waste printed circuit boards are crushed and sorted, obtaining a polymetallic complex mixture containing the bismuth elements; adding a separating agent in the polymetallic complex mixture, and putting the prepared polymetallic complex mixture in a graphite crucible of a vacuum furnace; after the metal mixture is completely melted, adding a lead trapping agent, then adding a trace of enrichment agent, therefore enabling the bismuth elements to be selectively enriched into a lead liquid phase, and enabling a melt in the crucible to generate liquid phase layering to form a separated melt with liquid copper on the upper layer and liquid lead on the lower layer; respectively pouring out the upper-layer liquid copper and the lower-layer liquid lead trapped with the bismuth elements. Thus, bismuth is separated from the polymetallic complex mixture of the waste printed circuit boards and is recycled. The method is simple and easy and has the characteristics of low cost, integrated high efficiency and no pollution.

The present invention relates to a method for preparing active carbon, which comprises the following steps: crushing, sieving and drying woody raw materials, soaking the raw materials into a zinc chloride solution according to the mass ratio of the raw materials to zinc chloride of 1:1-4, and drying the solution; performing cracking activation under the vacuum condition, wherein the temperature rise rate is between 5 and 15 DEG C per minute, and the cracking final temperature is between 400 and 500 DEG C; maintaining at the cracking final temperature for approximately 1 hour; and performing acid washing, water washing and drying on the reaction product to obtain the product, namely the active carbon. Compared with active carbon prepared under the condition of normal pressure, the active carbon prepared by the method has the advantages that the micropore rate is improved by 5.34 to 13.18 percent, the specific surface area is increased by 6.21 to 20.31 percent, and the adsorption performance is superior. Moreover, a byproduct, namely biological oil, can be collected when the active carbon is obtained simultaneously, so that the resource utilization rate is high and the energy consumption is reduced.

The invention belongs to the technology of comprehensive recycling of complex nonferrous metal secondary resources, and particularly relates to an enrichment and separation method of cadmium in waste circuit board multi-metal hybrid resources. The method includes the steps that firstly, a multi-metal complex mixture containing cadmium is obtained from a waste circuit board through smashing and sorting; a separating agent is added into the multi-metal complex mixture; the prepared multi-metal complex mixture is placed in a graphite crucible of a vacuum furnace; after the metal mixture is completely melted, trapping agent lead and a trace enrichment reagent are added; and cadmium is selectively enriched in a lead liquid phase, a separation melt with liquid copper on the upper layer and liquid lead on the lower layer is formed, and the liquid copper on the upper layer and the liquid lead trapping cadmium on the lower layer are poured out respectively. Thus, cadmium is separated from the multi-metal complex mixture of the waste circuit board and is further recycled. The method is simple and easy to implement and has the characteristics of being low in cost, comprehensive, efficient, free of pollution and the like.

The invention discloses a light color adjustable valence alternation manganese ion doped aluminate luminescent material and a preparation method thereof. The chemical composition of the material is shown as Ca1-jAl12O19:iMnx+,jLn<3+>, wherein Ln is one of La<3+>, Bi<3+>, Sm<3+>, Nd<3+> and Tm<3+>; i is more than or equal to 0.01 percent and less than or equal to 1.0 percent, j is more than 1 percent and less than or equal to 7.0 percent, and x is equal to 2 or 4. A high-temperature solid phase method is adopted by the preparation method; and the preparation method comprises the following steps of: fully grinding the solid raw materials and uniformly mixing the ground raw materials according to a stoichiometric proportion; sintering by two steps by the high-temperature solid phase method; and cooling to obtain the product. Manganese ions are automatically reduced in air through charge compensation. The material can emit red light or green light and or red light and green light when exposed under ultraviolet rays. The light color of the material can be regulated by the concentration of trivalent doped ions and valance states of manganese ions, and the material is suitable for two-primary color and three-primary color white light-emitting diodes (LEDs).

The invention belongs to the technology of comprehensive recycling of complex secondary nonferrous metal resources, and particularly relates to an enrichment and separation method of cobalt in waste circuit board multi-metal hybrid resources. The method includes the steps that firstly, a multi-metal complex mixture containing cobalt is obtained from a waste circuit board through smashing and sorting; a collecting agent is added into the multi-metal complex mixture; the prepared multi-metal complex mixture is placed in a graphite crucible of a vacuum furnace; after the metal mixture is completely melted, trace enrichment reagent niobium or boron is added to regulate the separation rate of liquid copper and liquid iron; a liquid copper and liquid iron mixed melt is a separation melt, the upper layer of the separation melt is the liquid iron, and the lower layer of the separation melt is the liquid copper; and the liquid iron gathering cobalt on the upper layer is poured out, and cobalt is separated from the multi-metal complex mixture of the waste circuit board to be recycled. The method is simple and easy to implement and has the characteristics of being low in cost, comprehensive, efficient, free of pollution and the like.