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1924results about How to "Avoid pollution" patented technology

Machine-manufactured natural sand grading adjustment system and manufacturing method of natural sand

ActiveCN103350017AIncrease production capacityAvoid pollutionGrain treatmentsNatural sandSand separator
The invention relates to a machine-manufactured natural sand grading adjustment system and a manufacturing method of natural sand. The discharging end of a feeding conveying belt is opposite to a feeding port of a steel-sand mixing hopper; the steel-sand mixing hopper is opposite to a discharging port of a tower-type steel-ball bucket elevator by a steel-ball feeding chute; a discharging port of the steel-sand mixing bucket is communicated with a feeding port of a machine-manufactured sand grading adjustment machine; a dust collecting cover of the machine-manufactured sand grading adjustment machine is communicated with a dust remover by a conveying pipe; a discharging port of the machine-manufactured sand grading adjustment machine is opposite to the feeding end of a discharging conveying belt; a first-stage electromagnetic steel-sand separator is arranged above the discharging end of the discharging conveying belt, and a discharging port of the first-stage electromagnetic steel-sand separator is opposite to the surface of a steel-ball particle-diameter control chute by a steel-ball discharging chute; the surface of a steel-ball particle-diameter control chute is provided with a steel-ball particle-size control section; the discharging end of the steel-ball particle-size control section is opposite to a feeding port of a thick-steel-particle ground groove; the discharging end of the discharging conveying belt is opposite to a finished-product conveying belt; a second-stage electromagnetic steel-sand separator is arranged above the discharging end of the finished-product conveying belt.
Owner:ZHEJIANG SHUANGJIN MACHINERY HLDG

Method for reclaiming valuable element through gradient chlorination of vanadium slag

The invention relates to a method for reclaiming valuable elements through gradient chlorination of vanadium slag, which belongs to the technical field of chemical industry and is used for solving the problem of efficiently reclaiming multiple metal elements in the vanadium slag. The method is characterized by comprising the steps of proportioning raw materials, fractionating vanadium tetrachloride and vanadium oxytrichloride, fractionating ferric trichloride, fractionating titanium tetrachloride, chromium trichloride and silicon tetrachloride, collecting fractionation products, processing chlorination tailings and the like. By directly adopting the vanadium slag as the raw material in the method of the invention, the highly efficient and comprehensive utilization of vanadium-titanium magnetite resources is realized in one process; the valuable elements such as iron, vanadium, chromium, silicon, titanium and the like are enriched through gradient chlorination and selective separation, and the purifying process is relatively simple; closed circulation can be realized by using chlorine in the process and has no environmental pollution; and the whole flow is disengaged from an aqueous system, thereby water resources are saved, and meanwhile, the pollution of the traditional flow to the environment is avoided. The method of the invention has the advantages of short flow, high element yield, no pollution, high benefit and the like.
Owner:HEBEI IRON AND STEEL

Novel method for preparing silicon dioxide and active carbon from rice hull ash

The invention discloses a novel method for preparing silicon dioxide and active carbon from rice hull ash, in particular relatives to a novel method for preparing silicon dioxide and active carbon from rice hull ash obtained through thermal decomposition of rice hulls. Major raw materials of sodium carbonate react with the rice hull ash after high-temperature decomposition to generate sodium silicate solid, and a soluble glass solution and solid active carbon are obtained after water dissolution, so the one-step completion of the silicon dissolution and activation is realized. The soluble glass solution is carbonized for separating out the silicon dioxide, a sodium carbonate solution is obtained through filtration, and sodium carbonate solid is obtained through crystallization. In the whole preparation process, the sodium carbonate only performs the effect of a catalyst, so sodium carbonate has no consumption, can be in cyclic utilization, reduces the cost, and reduces the waste water discharge. In the silicon dissolution stage, carbon dioxide gas generated by the decomposition of the sodium carbonate is fixed with burning tail gas of the rice hulls to be used as precipitating agents for preparing the silicon dioxide through purification treatment, so the cost is reduced, the greenhouse gas discharge is reduced, and the cyclic utilization of the carbon dioxide is realized.
Owner:JILIN UNIV

Energy-saving vegetable cleaning machine

InactiveCN104923510AAvoid pollutionImprove cleaning efficiency and cleaning effectCleaning using liquidsWater pipeMotor drive
The invention discloses an energy-saving vegetable cleaning machine. The energy-saving vegetable cleaning machine comprises a cleaning machine body, a cleaning barrel and a circulating water pump. A cover plate is arranged on the upper surface of the cleaning machine body, the left end of the cover plate is fixedly connected with the inner wall of the upper side of the cleaning machine body through a rotating shaft, and a liquid inflow pipe is arranged at the right end of the upper side of the cleaning machine body. According to the energy-saving vegetable cleaning machine, a motor drives the horizontal cleaning barrel to perform overturning cleaning on vegetables, and the cleaning effect and the efficiency of the cleaning machine are improved. The vegetables are cleaned in the mode of ultrasonic cleaning and spray-washing of cleaning liquid, the cleaning efficiency is further improved, and it is guaranteed that the vegetables are clean and hygienic. Water in the cleaning machine is cyclically pumped into a cleaning water pipe by the circulating water pump to perform spray-washing on the vegetables, water resources are saved, using cost is reduced, the cleaning machine can freely and conveniently move, convenience and practicability are high, vibration of the machine body can be effectively reduced through springs, mechanical stability of the machine body is improved, and besides, working noise is low when the cleaning machine works.
Owner:苏晓玲

Treatment method on surface of magnesium alloy

The invention relates to a treatment method on surface of magnesium alloy, belonging to the technical field of chemical treatment technology of metal surface. The invention provides a method of surface treatment of magnesium alloy. The method comprises the main procedures as follows: the surface of magnesium alloy is polished, washed by alkali, then processed by fluorozirconate composite conversation film surface treatment fluid, and finally sprayed with thermoplastic acrylic acid inhalator paint to finish the surface treatment; The formation of chemical conversion film is the most important key process, fluorozirconate composite conversation film surface treatment fluid mainly contains aqueous solution formed by fluorozirconate, dihydric phosphate, phosphoric acid, ammonium bifluoride and film formation accelerators namely nitrobenzene sodium dulfonate, inhibitor sodium fluoride or sodium borate and the like, the chemical conversion film generated by treatment has better corrosion resistance, and has excellent adhesive force with subsequent organic coating, thus being capable of enhancing the anticorrosion ability of magnesium alloy. Furthermore, the treatment fluid contains no chromium compounds, thereby preventing hexavalent chromium ion from polluting the environment, thus being beneficial for environmental protection.
Owner:SHANGHAI MUNICIPAL ELECTRIC POWER CO +1

Method for preparing high purity rare earth metal and its apparatus

The invention relates to a method for preparing a high purity rare earth metal and its apparatus, which is characterized in that a lithium thermal reduction-vacuum distillation combined technology is used for preparing the high purity rare earth metal. The method comprises the following steps: taking rare earth chloride as a raw material and lithium metal as a reducing agent, placing in a reaction container, in a reaction system, carrying out a liquid-liquid displacement reaction of lithium metal and rare earth chloride under the inert gas protection (the pressure is 0.1-0.5 MPa) and the temperature of 850-1100 DEG C, then vacuum-pumping the reaction system to 10<-1>-10<-3> Pa, wherein the temperature is controlled at 900-1200 DEG C, evaporating lithium metal and lithium chloride, separating slag and metal to obtain the high purity rare earth metal. The reaction apparatus is composed of a furnace cover (1), a communicating pipe (2), a collector (3), a furnace body (4), a thermal baffle (5), a reactor (6), a heating device (7), an inflation system (8) and a vacuum system (9). The invention has the advantages of short process flow, high yield of rare earth metal and low production cost; the purity of the prepared rare earth metal is high. The used apparatus is simple and is easy to enlarge, and is suitable for large batch of industrial production.
Owner:GRIREM ADVANCED MATERIALS CO LTD

Specific pathogen free Chinese shrimp zero water-changing seedling and seed production process

The invention relates to a zero water change sapling of Chinese prawn that is specific pathogen-free (SPF). The operation procedures are that: the first step is the preparation, mainly comprising the cultivation of seawater disinfectant treatment of sapling, the disinfection of such implements as sapling cultivation barrels and the cultivation of biological baits; the second step is the manual cultivation of parent prawns, roe collecting, larve selection and disinfection; furthermore, the alive baits and collected naupliuses are strictly pathogen tested by specific pathogen quarantine technique, and those with negative results are continuously cultivated; and then the breeding density of every genealogies is regulated, the environmental condition is manually controlled, and suitable and moderate quantity of animal and plant baits and qualified foodstuff are adopted according to the requirements of physicochemical environment and baits in different development phases. The invention has simple operation procedure, which is suitable for being applied to large scale sapling production, and the specific pathogen free rate of prawn sapling is as high as 100 percent, thus supplying SPF parent prawns and SPF saplings or highly healthy saplings for prawn cultivation enterprises.
Owner:YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI

Process for separating molybdenum and nickel form black shale containing molybdenum and nickel

InactiveCN101289702AAvoid pollutionRealize separation and extractionProcess efficiency improvementAmmonium molybdateMaceral
The invention relates to a method for separating molybdenum and nickel from black shale containing molybdenum and nickel, belonging to the metallurgic-chemical technical field. The method is characterized in that the black shale containing molybdenum and nickel is crushed and ground and undergoes oxygen pressure leaching in a pressure pan by using diluted acids and oxidants, and leach solution containing molybdenum and nickel and leached mud are obtained after filtering; ammonium molybdate and nickel sulphate solution are obtained respectively after the leach solution undergoes extraction and back extraction by different back extraction agents. The method leaves out a calcining step existing in the conventional process, thereby avoiding the environmental pollution of gases such as SO2; by the oxygen pressure leaching, molybdenum and nickel in black carbonaceous shale containing molybdenum and nickel are directly converted and dissolved so as to generate molybdenum sulfate acyl((MoO2)SO4) and nickel sulfate(NiSO4) to enter the solution for enrichment, so that the method better realizes the separation and extraction of molybdenum and nickel and is a clean manufacturing technology with reinforced conversion; moreover, the principal process is not limited by changes of mineral compositions.
Owner:KUNMING UNIV OF SCI & TECH
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