51results about How to "Improve electrolysis current efficiency" patented technology

The invention discloses electric flocculation method and device for recovering and processing desulfurized wastewater. The electric flocculation method for recovering and processing desulfurized wastewater comprises the following steps of: collecting desulfurized wastewater to enter an electric flocculation reactor, then, carrying out solid-liquid separation, recovering the separated clear effluent water in a clinker-flushing system of an electric power plant or directly discharging the separated clear effluent water, conveying the sludge to dewater in a mud-processing system, and returning the effluent water of the mud-processing system to a water intake system. Compared with the prior art, the electric flocculation technology is adopted to substitute a complicated chemical method for recovering and processing the desulfurized wastewater, can effectively remove pollutants in the wastewater, reaches a heavy metal processing rate up to 95-99 percent, a chlorine-processing rate over 80 percent and removal rates of ammonian, and the like over 90 percent, greatly shortens the processing time, improves the processing efficiency and saves the investment cost. Moreover, the electric flocculation processing device has small size, extremely small floor occupation, good environmental-protection performance and low cost without additional flocculating agents.

The invention provides a device used for producing water supply javel water. The device comprises a water softener, the water softener is connected with a saline preparation box, the saline preparation box is connected with a high-position saline box, the high-position saline box is connected with an ionic exchange membrane cell anode chamber with a flow guide weir, and an ionic exchange membranecell cathode chamber is connected with a high-position alkali liquor box; the anode chamber generates light salt brine and chlorine, and the cathode chamber generates hydrogen and sodium hydroxide; the anode chamber is connected with a gas-liquid separator, the gas-liquid separator is connected with a light salt brine circulation tank with a grating plate, and the light salt brine circulation tankis connected with the saline preparation box; the high-position alkali liquor box, the gas-liquid separator and the light salt brine circulation tank are connected with a chlorine negative pressure absorbing and sodium hypochlorite circular reaction system, and a sodium hypochlorite solution is generated by the chlorine negative pressure absorbing and sodium hypochlorite circular reaction system.After the javel water produced through the device is added into water, changes of indexes such as the pH value and the total dissolved solid of the water are small, generated disinfection by-productsare fewer, meanwhile, the running cost is low, and maintenance and management are convenient.

The invention provides a method for preparing a TiB2 cathode coating for aluminium electrolysis. The method comprises the following steps: grinding such materials as TiB2, a carbon-based material, an additive and the like, then mixing the ground materials proportionally and further mixing the ground materials uniformly in mixing and kneading equipment to obtain a solid powder mixture; adding a diluent into an adhesive, continuously stirring the two materials until the two materials are fully mixed uniformly; and pouring the uniformly mixed mixture of the diluent and the adhesive into the mixing and kneading equipment, nixing the mixed mixture of the diluent and the adhesive with the solid powder mixture and stirring the materials until the materials are mixed uniformly, thus obtaining the TiB2 composite required for aluminium electrolysis. The method has the following beneficial effects: after the product produced by the method is used in an aluminium electrolytic cell, the service life of the aluminium electrolytic cell is greatly prolonged and simultaneously the current efficiency of an aluminium electrolysis process is greatly improved, thus lowering the production cost of aluminium per ton; and the method has the advantages of short process flow, low production treatment cost and low environmental pollution.

The invention provides a method for preparing battery grade lithium hydroxide monohydrate. The method utilizes crude lithium carbonate as a raw material, and includes the following steps: acid dissolution, preliminary impurity removal, deep impurity removal, evaporation concentration, preparation of lithium hydroxide by ion-exchange membrane electrolysis, evaporation crystallization, and recrystallization. The method is rich in source of raw material and has the advantages of recycling and utilizing resources, and being less in type of contained impurities and easy to remove; chlorine gas polluting the environment is not produced and product sulfuric acid can be reused to dissolve, and consumption of raw materials is reduced; and the pH of an anolyte is controlled by controlling a circulation anolyte to increase the efficiency of current.

The invention discloses an aluminum electrolysis method with aluminum as a cathode, and relates to the improvement on a method for producing electrolysis aluminum through a molten-salt method. The aluminum electrolysis method is characterized in that in the aluminum electrolysis process, molten aluminum at the bottom of an electrolysis cell is adopted as the cathode for conducting aluminum electrolysis; and the molten aluminum at the bottom of the electrolysis cell makes contact with a cathode busbar to form the aluminum electrolysis cathode. According to the aluminum electrolysis method with the aluminum as the cathode, a conventional anode system, a discharging system and a dust purifying system can be adopted in the aluminum electrolysis cell. According to the method, the molten aluminum in which no cathode carbon block, no steel bar and no titanium boride coating exist is adopted as the cathode to replace a cathode composed of steel bars and a carbon block set. The defects that according to a traditional aluminum electrolysis cell, aluminum oxide deposit exists on cathode carbon blocks and cellular micro-batteries exist are eliminated. In the electrolysis production process, the problem that aluminum oxide and aluminum carbide which are deposited and generated at the furnace bottom pollute electrolysis molten aluminum does not exist.

The invention discloses an industrial energy-saving high-frequency impulse electrolytic manganese device which comprises one or more phase-shifting transformers, one or more three-phase rectifier bridge assemblies, one or more power assemblies and a power master control unit, wherein the primary sides of the phase-shifting transformers are connected with the output end of a three-phase alternating-current supply and the secondary sides of the phase-shifting transformers are in one-to-one corresponding connection with the inputs of the three-phase rectifier bridge assemblies, respectively; the output ends of the three-phase rectifier bridge assemblies are correspondingly connected with the input ends of the power assemblies, and the output ends of the power units output high frequency impulse signals to electrolytic baths; the voltages output by the secondary sides of phase-shifting transforming units are determined according to the quantity of the electrolytic baths connected in series; when a plurality of the phase-shifting transformers are adopted, the phase-shifting transforming units are the phase-shifting transformers in multiple forms for reducing harmonic waves of an alternating current input current and harmonic amplitudes and current impulses of a direct current output voltage; the power master control unit is respectively connected with one or more power assemblies for current-sharing control of the power assemblies.

The invention discloses a method and system for rapidly detecting a cathode short circuit. The method comprises the following steps: continuously measuring cathode current; judging whether an added value of the cathode current in pre-set time is in a pre-set added value range or not; if so, establishing a linear model according to changes of the cathode current along time and calculating a slope and a determination coefficient according to the linear model; if not, judging that the cathode is not short-circuited; judging whether the slope is in a pre-set slope threshold value range; if so, judging whether the determination coefficient is greater than a pre-set determination coefficient threshold value or not; if not, judging that the cathode is not short-circuited; if the determination coefficient is greater than or equal to the pre-set determination coefficient threshold value, judging that the cathode is short-circuited; if the determination coefficient is less than the pre-set determination coefficient threshold value, judging that the cathode is not short-circuited. By adopting the method and the system, disclosed by the invention, lasting short-circuit current loss can be avoided and the electrolytic current efficiency is improved.

The invention relates to a bipolar electrode plate for preparing metal aluminum by aluminum chloride electrolysis and a using method of the bipolar electrode plate, and belongs to the technical fieldof electrolytic aluminum. The bipolar electrode plate for preparing metal aluminum by aluminum chloride electrolysis comprises a bipolar electrode plate base block and an insulating block. The bipolarelectrode plate base block is divided into a cathode end and an anode end. In the bipolar electrode plate base block, the remaining periphery is provided with insulating blocks correspondingly exceptthe end surface of the cathode end and the end surface of the anode end. The width of the insulating block needs to comply with the following relation: (Rho<C>*h+2.15/D*S)<<Rho<L>*(b+h). According tothe bipolar electrode plate, the insulating block is connected to the bipolar electrode plate base block, and the width of the insulating block is defined, so that when the bipolar electrode plate for preparing the metal aluminum by aluminum chloride electrolysis, bypass current can be effectively reduced, current efficiency is improved, and the electrolytic energy consumption is reduced.

The invention relates to a vitriol precipitating and Fe removing process in a zinc hydrometallurgy technology. The vitriol precipitating and Fe removing process comprises the following steps: adjusting the pH value of vitriol precipitating supernatant, adding an oxidizing agent for reaction, adjusting the pH value of reaction liquid to 4.8-5.2, precipitating so as to removing Fe, and adjusting the pH value of the vitriol precipitating supernatant to 3.5-4.5, wherein the oxidizing agent is an H2O2 oxidizing agent or an H2O2-manganese powder combined oxidizing agent, the reaction temperature is 60-70 DEG C, and the stirring reaction time is 40-90 minutes. According to the vitriol precipitating and Fe removing process, Fe2+ is oxidized into Fe3+ by using the H2O2 oxidizing agent or the H2O2-manganese powder combined oxidizing agent, and the formed iron vitriol is removed. The iron removal by jarosite process is low in cost and capable of reducing the content of manganese ions in a system, effectively controlling the manganese ions in the system to 5-6g/l required by the process and effectively reducing systemic circulation volume and zinc content in acid leaching slag and iron vitriol slag, thereby increasing the recovery rate of zinc metal, improving the efficiency of electrolytic currents and reducing power consumption; and production processes are simplified.

The invention belongs to the technical field of ion exchange membranes, and particularly relates to a reinforced perfluorocarboxylic acid ion exchange membrane with a bubble dredging function and a preparation method thereof. The reinforced perfluorocarboxylic acid ion exchange membrane with the bubble thinning function is composed of a perfluorocarboxylic acid polymer layer, a porous reinforcingmaterial layer and functional surface coatings, the functional surface coatings are located on the upper surface and the lower surface of the perfluorocarboxylic acid polymer layer, the porous reinforcing material layer is embedded in the perfluorocarboxylic acid polymer layer, and the functional surface coating is of a porous rough structure composed of a perfluorinated ionic polymer. The reinforced perfluorocarboxylic acid ion exchange membrane with the bubble thinning function can effectively reduce the cell voltage, reduce the electrolysis energy consumption and reduce the production costin a novel zero-polar-distance electrolytic cell under the condition of high current density, and is suitable for the field of electrolysis of sodium chloride and potassium chloride; the invention also provides a preparation method thereof.

The invention discloses an aluminum electrolysis cell with aluminum as a cathode, and relates to the improvement on aluminum electrolysis cell production with cryolite aluminum monoxide melt as an electrolyte and through a molten salt method. The structure of the aluminum electrolysis cell comprises a prebaked anode, a discharging device and a dust purifying device. The aluminum electrolysis cell is characterized in that the structure of a cathode system of the aluminum electrolysis cell comprises an electrolysis cell body, cathode partition walls and a cathode busbar, the cathode partition walls are arranged in cell ledges at the two ends of the aluminum electrolysis cell body, a bottom channel is formed between the bottoms of the cathode partition walls and the lower bottom of the aluminum electrolysis cell body, side channels are formed by the cathode partition walls and the inner walls of the cell ledges at the ends of the aluminum electrolysis cell body, and the cathode busbar enters the aluminum electrolysis cell body from the side channels formed by the cathode partition walls and the inner walls of the cell ledges at the ends of the aluminum electrolysis cell body. According to the aluminum electrolysis cell with aluminum as the cathode, molten aluminum in which no cathode carbon block, no steel bar and no titanium boride coating exist is adopted as the cathode to replace a cathode composed of steel bars and a carbon block set. The defects that according to a traditional aluminum electrolysis cell, aluminum oxide deposit exists on cathode carbon blocks and cellular micro-batteries exist are eliminated. In the electrolysis production process, the problem that aluminum oxide and aluminum carbide which are deposited and generated at the furnace bottom pollute electrolysis molten aluminum does not exist.

The invention provides a method for improving the efficiency of electrolytic current. The method includes the steps that an electrolytic working solution is prepared and includes background electric conduction ions and electrolytic target metal ions, wherein the concentration of the background electric conduction ions is higher than that of the target metal ions; the electrolytic working solution enters an electrolyzing unit in a filling manner, and the electrolyzing unit is provided with a cathode room and an anode room; and the electrolytic working solution is controlled to pass through the part between the cathode room and the anode room in a directional and orderly manner and at a constant speed. The invention further provides a method for conducting metal electrodeposition through the above method and a metal electrodeposition device.

The invention discloses a double-layer aluminum cathode aluminum electrolysis cell cathode, and relates to the improvement on aluminum electrolysis cell production with aluminum as the cathode, with cryolite aluminum monoxide melt as an electrolyte and through a molten salt method. The double-layer aluminum cathode aluminum electrolysis cell cathode is characterized in that the structure of the cathode comprises an electrolysis cell body, two cathode partition walls, a cathode busbar and a cathode horizontal partition plate, wherein the two cathode partition walls are arranged in cell ledges at the two ends of the aluminum electrolysis cell body and fixedly connected with the inner walls of side cell ledges of the electrolysis cell body, the cathode busbar enters the electrolysis cell body from side channels formed by the cathode partition walls and the inner walls of the cell ledges at the ends of the aluminum electrolysis cell body, and the cathode horizontal partition plate is located in the electrolysis cell body and provided with molten aluminum through holes. According to the double-layer aluminum cathode aluminum electrolysis cell cathode, molten aluminum in which no cathode carbon block, no steel bar and no titanium boride coating exist is adopted as the cathode to replace a cathode composed of steel bars and a carbon block set. The defects that according to a traditional aluminum electrolysis cell, aluminum oxide deposit exists on cathode carbon blocks and cellular micro-batteries exist are eliminated. In the electrolysis production process, the problem that aluminum oxide and aluminum carbide which are deposited and generated at the furnace bottom pollute electrolysis molten aluminum does not exist.

The invention relates to a method for electrolytically separating a stannum-lead alloy through a low eutectic solvent and belongs to the technical field of ionic liquid metallurgy. Choline chloride and ethanediol are mixed in accordance with the molar ratio being 1:2 and then are subjected to heating, stirring and eutectic melting at the temperature of 80 DEG C till clear and transparent liquid is formed, and a choline chloride-ethanediol low eutectic solvent, namely 1ChC1:2EG DES for short, is synthesized; stannous chloride is added into the synthesized 1ChC1:2EG DES, stirring is conducted till even dissolution is achieved, and an electrolyte solution is prepared; the prepared electrolyte solution is heated to be 30-70 DEG C, a stannum-lead alloy block serves as a positive pole, a copper sheet serves as a negative pole, and electrolysis is conducted; and branch-shaped stannum powder is obtained on the negative pole and is slightly scraped off from the negative pole, and the stannum powder containing Sn being equal to or more than 99.95 wt% is obtained after the branch-shaped stannum powder is subjected to ultrasonic dispersion cleaning and drying. According to the electrolytically separating the stannum-lead alloy through the low eutectic solvent, the electrolyte solution is prepared by adding the moderate stannous chloride into the choline chloride-ethanediol low eutectic solvent, the steam pressure of the electrolyte solution is extremely low, the electrolyte solution is hardly volatilized, heat stability is good, an electrolyte system is environmentally friendly, and the electrolyte solution can be recycled.

The invention belongs to the technical field of ion exchange membranes, and particularly relates to an ultrathin perfluorocarboxylic acid ion exchange membrane with a rough coating and a preparation method of the same. The ultrathin perfluorocarboxylic acid ion exchange membrane with the rough coating is composed of a perfluorocarboxylic acid polymer layer, a porous non-woven polymer layer and functional surface coatings, wherein the functional surface coatings are located on the upper surface and the lower surface of the perfluorocarboxylic acid polymer layer, and the porous non-woven polymerlayer is embedded in the perfluorocarboxylic acid polymer layer; the thickness of the perfluorocarboxylic acid polymer layer is 10-80 [mu]m; the functional surface coating is of a porous rough structure formed by a mixture of a perfluorinated ionic polymer and a metal oxide. According to the invention, the ultrathin perfluorocarboxylic acid ion exchange membrane has the rough coating, so that thecell voltage can be effectively reduced, the electrolysis energy consumption can be reduced, and the production cost can be reduced in a novel zero-polar-distance electrolytic cell under the condition of high current density; the invention also provides a preparation method thereof.

The invention belongs to the technical field of ion exchange membranes, and particularly relates to a reinforced perfluorocarboxylic acid ion exchange membrane with a rough coating, and a preparationmethod thereof. The reinforced perfluorocarboxylic acid ion exchange membrane is composed of a perfluorocarboxylic acid polymer layer, a porous reinforcing material layer and functional surface coatings, wherein the functional surface coatings are located on the upper surface and the lower surface of the perfluorocarboxylic acid polymer layer, the porous reinforcing material layer is embedded in the perfluorocarboxylic acid polymer layer, and the functional surface coating is of a porous rough structure composed of a perfluorinated ionic polymer and a metal oxide. The reinforced perfluorocarboxylic acid ion exchange membrane with the rough coating can effectively reduce the cell voltage, reduce the electrolysis energy consumption and reduce the production cost in a novel zero-polar-distance electrolytic cell under the condition of high current density, and is suitable for the field of electrolysis of sodium chloride and potassium chloride. The invention also provides a preparation method of the reinforced perfluorocarboxylic acid ion exchange membrane.