Butterfly Valve,Wafer Butterfly Valve,4 Butterfly Valve,3 Butterfly Valve Wuzhong Instrument Co., Ltd. , https://www.wzivalve.com
In the production process, the cause of the decrease of the electrolyte body is due to the evaporation of the electrolyte, the removal of the solution by the purification slag and the extraction of part of the electrolyte to prepare nickel carbonate; the reason for the volume expansion of the electrolyte is due to the introduction of the electrolyte into the electrolyte. When purifying, the reagent is added to the water and the various washing water returned. In actual production, the possibility of volume expansion is much greater than that of volume reduction, especially for various slag washing waters. Because of the large amount, if the operation is improperly controlled, the volume of the electrolyte will expand rapidly. Therefore, in the production, the washing water of various slags must be strictly controlled, and part of the electrolyte is extracted to prepare nickel carbonate to adjust the total volume of the electrolyte.
There should be a certain ion concentration in the electrolyte to increase the conductivity of the electrolyte. Since the pH of the electrolyte is required to be adjusted with the sodium carbonate solution during the purification of the electrolyte, the concentration of sodium ions in the electrolyte gradually increases. In order to keep the sodium ion concentration in the electrolyte within a certain range, a certain amount of sodium salt must be periodically excluded in the production system. At present, there are two methods for discharging sodium salts. Nickel returns to the electrolyte circulation system, and the solution after nickel carbonate precipitation contains a large amount of sodium ions, which is discarded; the other method uses more, but the filtered nickel carbonate Still containing about 10% sodium, in order to reduce the amount of sodium returned to the electrolyte, a nickel factory installed a plastic nozzle above the cylinder filter, and washed the filter cake with hot water at 60 ° C. The washed sodium carbonate can be reduced. Up to 2% is good for sodium ion balance.
1) Preparation of the lower tank of the anode and the anode. The anode of the lifting ear (small ear) is placed on the shelf plate before the lower tank. The so-called plate operation is to arrange the anode according to the specified anode plate spacing on the shelf, and adjust the height of the lifting ears to prevent the copper ear from immersing in the solution and to align the anode lifting lugs on the conductive copper rod (for large For the ear anode, just adjust the pole spacing.)
Before using the anode copper rod, the surface of the copper surface should be polished to remove the oxide layer on the copper surface to make it contact with the anode lifting lug. The contact points of the slot bus should also be cleaned up.
The first piece should be immersed in a hydrochloric acid solution with a concentration of 10-20 g/L for 3 to 30 minutes before being placed in the tank, and then rinsed with hot water. The purpose is to prevent the electric nickel from smashing, causing interlayers and burrs. . In order to ensure good electrical conduction between the cathode copper rod and the cathode lifting lug, the oxides on the surface of the lifting lug and the copper rod and other attachments are also cleaned.
When the initial piece is inserted into the diaphragm, it must be straight and straight, otherwise the diaphragm will be perforated due to the sticky bag. For the first pole piece with low rigidity, it is easy to bend and deform after the lower groove due to the internal stress of the deposit. In severe cases, it will pierce the diaphragm and form a short circuit with the anode. Therefore, the cathode is taken out the next day after the lower groove. Perform a straight correction, commonly known as a "flat" operation. Although the tablet operation is labor intensive, it is beneficial to improve the quality and yield of the electro-nickel. The hydraulic flat plate embossing machine successfully tested in a factory has a pressure of 118-157 MPa, and the extruded rice-shaped rib has a width of 30 mm and a depth of 2 mm. The bending deformation phenomenon after the embossed initial piece of the lower groove is greatly reduced.
2) When the cell is discharged from the cell, it needs to be short-circuited. When the single-channel artificial copper bar is short-circuited, the cell voltage is high and the current is large. If the cross-wave is not good, the bus bar will be burned and the open circuit will be broken. ACCIDENT. Now, the cross-electrical device has been fixed and improved, which basically eliminates the above accidents. The number of days in the most extreme cycle depends on the current density and the sulfur content of the anode. For the crude nickel anode, the anode cycle is 14-18 days, and the scraping anode mud operation is generally not performed in the middle. For nickel sulfide anodes, the anode cycle is generally only 12 to 15 days due to the high anode mud rate, and it is required to arrange 1 or 2 times of scraping anode mud to prevent the tank voltage from rising.
In order to ensure the physical specifications of the cathode precipitate, the cathode period is generally 3 to 6 days.
In the case of plate hoisting, the liquid pan should be used in the workshop without large platform, so that the solution and anode mud falling under the crane can fall into the disk while avoiding contamination of the cathode chamber of other tanks. The use of large platform trucks is beneficial to increase the production capacity of the electrolyzer due to the shortened cross-hour time.
In order to prevent the anode mud from contaminating the cathode chamber during the operation of replacing the anode or scraping the anode mud, the diaphragm bag must be covered and covered. When the new anode and anode are in the groove, the contact points of the groove bus bar should be wiped clean. In order to prevent the anode liquid from pouring into the cathode chamber due to the increase of the volume of the solution in the tank when the new anode is installed, it is required to be taken out before entering the tank. A part of the anolyte. After the new cathode and anode are placed in the tank, the relative positions of the anode and the cathode should be recalibrated, and the height of the anode lifting lug should be checked to prevent the copper lifting lug from being immersed in the anolyte.
3) ESC operation The ESC operation is carried out on the groove surface, including the plate conductive, diaphragm use, new liquid flow and cathode, anode liquid level difference and cathode deposition state, etc., and timely adjustment according to the operating procedures. .
(1) Check the liquid level in the cathode chamber, keep the surface difference between the anode and the anode at 30 to 50 mm, and replace the diaphragm bag that is damaged or cannot maintain the liquid level in time.
(2) Check the conduction of the contact points between the cathode and the anode and the busbar busbar. Each class should be scrubbed once, and use the “short-circuit ignition method†to check whether it is energized or not.
(3) Adjust the flow rate of the new liquid and control the amount of new liquid used.
(4) Check the cathode deposition in the diaphragm and find that the cathode has cracked skin, long pores, long sponge nickel, etc., and should be treated in time.
In the nickel electrolysis process, the electrolyte circulation is a closed circuit system, that is, the catholyte percolates out the diaphragm to the anode chamber, and the anode electrolyte is purified and returned to the cathode chamber. Inflammation maintains long-term normal production, and the total volume of electrolyte circulating throughout the system must remain essentially constant.