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3719results about How to "Easy to recycle" patented technology

Method for extracting metal scandium and titanium from red mud

The invention relates to a method for extracting metal scandium and titanium from red mud; the method is used for extracting scandium and titanium from the red mud; the method takes the red mud which is produced through the sinter process of the high-grade ore two portion of clinker in alumina plant as the raw material; the hydrochloric acid with a concentration of 2 percent to 6 percent is used for leaching the calcium and sodium from the red mud to increase the content of the scandium and titanium in the red mud; and then the hydrochloric acid with a concentration of 16 percent to 22 percent is used for a second acid dipping of the red mud and the product of scandium oxide is obtained after the leaching liquid passes the processes of extraction, reverse extraction and baking; the hydrochloric acid with a concentration of 80 percent to 90 percent is used for a third acid dipping of the red mud after the second one and the leaching liquid is added with iron powder for reduction and then the temperature is reduced to crystallize and separate out iron in the pattern of FeSO<4>.7H<2>O; the acid liquid which contains titanium after the iron is removed is added with alkali and heated for hydrolysis; the product of titanium oxide is obtained after the hydrolysate is baked. The method is simple and easy to be carried out and most metal elements in the red mud can be recovered and the cost for processing the red mud is low, all of which are beneficial to the comprehensive utilization of the red mud.
Owner:GUIZHOU BRANCH CHINA ALUMINUM IND

Combined denitrification apparatus and method by shortcut nitrification and anaerobic ammonium oxidation of sludge-digestion liquid

The invention discloses a device for autotrophic nitrogen removal by combining A/O shortcut nitrification of sludge digestion liquid and anaerobic ammonium oxidation of granular sludge and a method thereof. The device of the invention comprises a digestion liquid tank, an A/O shortcut nitrification tank, a sedimentation tank, a middle water tank, an anaerobic ammonium oxidation tank, wherein, the digestion liquid tank is communicated with a first cancellus as an anoxic zone of the A/O shortcut nitrification tank by the inlet pump of the A/O shortcut nitrification tank; the sedimentation tank the upper part of which is communicated with the middle water tank by a water pipe is provided with a central pipe and the anaerobic ammonium oxidation tank is provided with a water bath sleeve and a granular sludge bed. In addition, the method of the invention comprises the following steps of starting the A/O shortcut nitrification tank; starting the anaerobic ammonium oxidation tank of the granular sludge; operating an autotrophic biological nitrogen removal system in series after the starting of the A/O shortcut nitrification tank and the anaerobic ammonium oxidation tank is respectively completed. The device and the method of the invention are applicable to the shortcut nitrification and the nitrogen removal of the sludge digestion liquid in a sewage treatment plant and have the advantages of advanced technology, simple structure of the device, convenient operation and good treatment effect of water purification.
Owner:BEIJING DRAINAGE GRP CO LTD

Underwater acoustic sensor networks and node deployment and networking method thereof

The invention relates to underwater acoustic sensor networks and a node deployment and networking method thereof. A target water area is covered in a hierarchical clustering manner, the networks are divided into three hierarchies, and each hierarchy is divided into multiple continuous 3D spaces; common underwater sensor nodes are uniformly distributed in different depths of the different hierarchies of the target area, sense and collect physical environment data of the surrounding, and form self-organizing clustering networks via the sound wave links; movable underwater nodes can move in the target water area, assess the water quality change of routes, and directly transmit an assessment result to water surface buoy nodes; and the water surface buoy nodes is mixed with communication modules, receive, process, gather and integrate underwater network data via the sound wave communication module, and transmit the network data to a land base station in the multi-hop manner via the radio electromagnetic wave communication module. The underwater acoustic sensor networks and the node deployment and networking method thereof can realize remote monitoring, is wide in monitoring range, high in expansibility and reliability, suitable for underwater applications, and has a good application prospect.
Owner:ZHEJIANG SCI-TECH UNIV

Process for preparing high-activity semi-hydrated gypsum cementing material and gypsum product by aid of phosphorous gypsum

InactiveCN102603219AEasy to recycleLower crystal transformation temperatureMineralogyEngineering
The invention relates to a process for preparing a high-activity semi-hydrated gypsum cementing material and a gypsum product by the aid of phosphorous gypsum. The process includes technical processes of 1) a pretreatment process for the phosphorous gypsum; 2) a normal-pressure water heating reaction process; 3) a slurry preparation process; and 4) a preparation process for the high-activity semi-hydrated gypsum cementing material and the gypsum product. The process for preparing the high-activity semi-hydrated gypsum cementing material and the gypsum product by the aid of the phosphorous gypsum has the advantages that a process for preparing the high-performance semi-dehydrated gypsum cementing material by the aid of the phosphorous gypsum is completed under the normal-pressure mild condition, the process can be combined with an independent gypsum product manufacturing process to produce gypsum blocks, gypsum plates or other semi-hydrated gypsum products, and production flexibility of the technical processes is realized. In addition, owing to normal-pressure conversion, investment cost and running cost are saved, the processes are easily controlled, reliability is improved, performances of the product are excellent, materials are wet during the process which adopts wet phosphorous gypsum raw materials and produces the product, flying dust is prevented, waste is utilized, and effects of saving energy and protecting environments are realized.
Owner:WUHAN UNIV OF TECH

Method for preparing Al-Al2O3 composite coating on surface of magnesium alloy

The invention relates to a method for preparing an Al-Al2O3 composite coating on the surface of magnesium alloy, belonging to the technical field of metal surface treatment. The Al/Al2O3 composite coating prepared on the surface of the magnesium alloy by a calorization-oxidation method has high corrosion resistance and rigidity. The method comprises the following main steps of: firstly, coating an aluminum coating to the magnesium alloy, and then electrochemically oxidizing the aluminum coating to form an aluminum oxide film layer having extremely high corrosion resistance and rigidity, wherein a cold spraying method or a molten-salt aluminum electroplating method is used in the preparation process of the aluminum coating of the magnesium alloy, and common anodic oxidization and plasma anodic oxidization are used for the oxidation of the aluminum coating. By coating the aluminum coating to the surface of the magnesium alloy to carry out calorization treatment and then carrying out electrochemical anodic oxidization, the invention enhances the comprehensive protective performance of the surface of the magnesium alloy, and the Al/Al2O3 composite coating prepared on the surface of the magnesium alloy has the advantages of large bonding strength, high rigidity, good corrosion resistance and the like, thereby being the ideal protective coating for the magnesium alloy.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI

Method for treating heavy metal-containing acidic waste water and recycling heavy metal with biomass fixed bed

The invention discloses a method for treating acidic waste water containing heavy metal and reclaiming the heavy metal through a biomass fixed bed, which is characterized in that dry solid biomass capable of being decomposed by microbes is granulated and filled into a container with a supporting layer and a water distributing device so as to form a fixed bed microbe reactor; sewage disposal plant sludge containing sulfate reducing bacteria is taken as the source of microbe bacteria on the fixed bed, and the microbes are cultured, proliferated and acclimated to adapt to the environment of the biomass filler fixed bed through the backflow circulation of the outputted water or taking ferrous sulfate aqueous solution as the inputted water; acid effluent containing heavy metallic ions is led into the fixed bed for direct filtration; and when the water filtering speed can not meet the preset requirements, the operation is stopped, substances in the fixed bed are taken out, the heavy metal is reclaimed through smelting, and the fixed bed microbe reactor is refilled. The method is suitable for waste water containing Cr2O7 <2->, AsO3 <2->, Cu <2+>, Hg <2+> Ag <+>, Cd <2+> and the like. The method can be used for reclaiming the valuable metal resources with low waste water treatment cost.
Owner:HEFEI UNIV OF TECH

Crushing and grinding device for production and processing of traditional Chinese medicinal materials

InactiveCN108940503AAvoid enteringImprove subsequent grinding efficiencyGrain treatmentsEngineeringMaterials processing
The invention discloses a crushing and grinding device for production and processing of traditional Chinese medicinal materials in the technical field of traditional Chinese medicinal material processing. The crushing and grinding device comprises a feeding hopper, a feeding pipe, a fixing case, a screening case, a crushing case and a grinding case. According to the crushing and grinding device, the traditional Chinese medicinal materials are put into the feeding hopper and then enter the crushing case along the feeding pipe, a crushing mechanism is used for crushing the traditional Chinese medicinal materials, and a feeding inlet of the crushing case conducting crushing rotates to face downwards; the traditional Chinese medicinal materials are screened through the screening case, and thenthe feeding inlet of the crushing case is rotated to face upwards; the traditional Chinese medicinal materials which do not penetrate through a first screening mesh return to the crushing case through the shovel face at the feeding inlet and are subjected to secondary crushing along with next batch of to-be-crushed medicinal materials, and the traditional Chinese medicinal materials enter the grinding case and are ground through a grinding mechanism; and meanwhile, completely ground medicine powder is fed into a powder outlet through a rotating brush, so that the situation that powder particles are too fine due to the fact that ground medicine powder is left in a grinding groove and ground repeatedly is avoided, and the grinding effect is good.
Owner:周意

Composting method for biologically dehydrating livestock manure

The invention provides a composting method for biologically dehydrating livestock manure, which comprises the following steps: under the condition of adding biological fermentation strains, horizontally laying the livestock manure, adding fly maggots for fermenting, and then, adding the livestock manure and biological fermentation strains in batches, wherein the fermentation period is 3-7 days, and the fermentation condition is 22-42 DEG C. The invention also provides a composting method for biologically dehydrating the livestock manure, which comprises the following steps: under the condition of adding the biological fermentation strains, horizontally laying the livestock manure, and then, adding the fly maggots for fermenting, wherein the fermentation period is 7-12 days, and the fermentation condition is 10-22 DEG C. The invention reduces the initial water content of livestock manure composting by microbiological synergistic action, fully performs the action of composting fermentation strains, does not need to add auxiliary materials for regulating the water content of the livestock manure, reduces the treatment cost of the livestock manure, and improves the composting quality. Meanwhile, the culture of fly maggots provides a large amount of high-quality feed protein and raw materials for further processing to better recycle organic wastes, thereby realizing the purposes of protecting environment and increasing efficiency and yield agriculturally.
Owner:ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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