47results about How to "Increase the limiting current density" patented technology

The invention discloses a sealed electrolysis bath and an electrolytic system, the electrolysis bath comprises two end plates, an anode component, a cathode component, sealing components and a compacting device, wherein liquid flowing ports are evenly arranged on the two end plates, liquid flowing through-holes are correspondingly arranged on the anode component and the cathode component, the anode component and the cathode component are separately arranged between the two end plates, a polar chamber is formed between the anode component and the cathode component, the sealing components are evenly arranged on the contact position of the anode component, the cathode component and the end plates, and the anode component, the cathode component and the end plates form a sealed structure afterbeing compacted through the compacting device. The electrolysis bath has simple structure and can increase the circulation speed of electrolyte, the overpotential is effectively lowered, the current density of an anode and a cathode is increased when in electrolysis, the productivity of unit electrolysis bath is increased, and the electrolysis bath can be widely applied in electrowinning various metal and in electrowinning metallic solution with low concentration. The sealed structure avoids the influence of gas which is discharged in the electrolysis process to environment in a workshop.

The invention discloses a method for preparing tellurium powder. The method comprises the following steps that (1), tellurium dioxide is added to a sodium hydroxide solution, and stirring and then filtering are conducted; (2), the solution filtered in the first step is used as electrolyte and subjected to rotational flow electrodeposition, and after electrodeposition is completed, the electrolyte is filtered, and an electrodeposition product is obtained; and (3), the electrodeposition product obtained in the second step is added to an oxalic acid solution and boiled and washed, and the tellurium powder is obtained after filtering and drying. According to the method, the rotational flow electrodeposition technology is used for the preparation of the tellurium powder for the first time, the flow velocity of the solution is increased with the help of the electrodeposition technology, the tellurium ion concentration of the surface of an electrode is increased, the thickness of a diffusion layer is lowered, the limiting current density is increased, electrodeposition precipitation of tellurium in the solution with the low tellurium content under the high current density is achieved, and the method is a process which is economical and environmentally friendly and is suitable for industrial production.

The invention relates to a preparation method of an electroplating diamond fret saw, comprising the following technological processes: 1. roughening processing is carried out to micrometer diamond particles in advance, nanometer diamond powder is added in cationic surface active agents according to the proportion of 1 : 3 by mass ratio, so as to prepare uniform and stable nanometer diamond powdersuspending liquid, plating solution is arranged in an electroplating tank, after the weighted nanometer diamond powder suspending liquid is mixed with the micrometer diamond particles according to the proportion of 1 : 3 by mass ratio, and then the mixture is added in the plating solution, the plating solution is circulated continuously, and nickel aminosulfonate is main material in the plating liquid, and boracic acid and nickel chloride are additionally added, and a magnetic stirring device is arranged in the electroplating tank; 2. a steel wire continuously and uniformly passes through theelectroplating tank, under the action of electrical current, nickel ions move to cathode from anode, so as to drive the nanometer diamond powder and the micrometer diamond particles to move to the steel wire, so as to lead the steel wire to be plated with the nanometer diamond powder and the micrometer diamond particles, meanwhile, chemical nickel-plating is carried out to the steel wire; 3. after the steel wire is separated from the electroplating tank, wires are wound up after being cleaned and dried. The method can continuously and quickly produce electroplating diamond fret saw, and the production efficiency is high.