Mandatory low temperature method to ensure the safe start-up process of zinc electrowinning when the copper quality exceeds the standard

Abstract

The invention provides a process for ensuring zinc electrowinning safety driving in case of overproof copper mass through a forced low-temperature method. A refrigeration fan is arranged on an electrolytic bath, the temperature during driving is 20-22 DEG C, the acid-zinc ratio is adjusted to 1.8-2.0, and the total load of current is 30%-40%; when the time reaches 24h, the concentration of copper ions is reduced to 2.8-3.2mg / l and the total load of the current is 40%-50%; when the time reaches 48h, the concentration of the copper ions is reduced to below 2.0mg / l, the total load of the production current is 50%-70%, and the temperature of the bath is ensured to be 20-30 DEG C; and when the time reaches 72h, the concentration of the copper ions is reduced to below 0.3mg / l and the normal production is restored. The process disclosed by the invention adopts a forced cooling segmental operation method, safety driving can be realized when the copper ions in a zinc electrolysis circulation solution are 5.0-1.5mg / l in concentration, ablation of a plate by copper can be avoided, the new method can be popularized and applied to other zinc wet smelters to improve the range of applications of a copper content standard in a zinc electrolyte in factories and reduce the problems that waiting time for driving is too long and the like because of overhaul or temporary parking of the factories and workshops, the technical and economic benefits are obvious, and the process has actual application value in production.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and particularly relates to a process for ensuring safe start-up of zinc electrowinning when copper quality exceeds the standard. Background technique [0002] During the zinc hydrometallurgy process, the electrolyte solution is constantly replaced with new solution to ensure that the copper content of the electrolyte solution is below 0.3mg / l, and burnout will easily occur if the standard is exceeded. The following table lists the new liquid quality process standards of well-known domestic enterprises in detail: [0003] Composition mg / l Zhuye Liu Zinc Kaifeng Zinc Northwest Metallurgy Anzhong (Japanese) Huludao Zn (g / l) 140～170 135～145 135～145 150～160 160 160 Cu ≤0.2 ≤0.1 ≤0.5 ≤0.3 ≤0.1 ≤0.5 co ≤1.0 ≤1.0 ≤2.0 ≤1.0 ≤0.5 ≤2.0 Ni ≤1.5 ≤1.0 ≤1.5 ≤0.1 ≤0.2 ≤0.5 Sb ≤0.3 ≤0.02 ≤0.06 ≤0.05 ≤0.01 ≤0.12 F ≤50 ≤50 ≤...

AI Technical Summary

Problems solved by technology

If any one of the new liquid quality standards is not implemented properly, the current efficiency of the cathode zinc produced by electrolysis will decrease, the unit consumption of DC power will increase, and the impurities of the cathode zinc produced will increase.

What's more serious is that it causes many problems such as the output of cathode zinc sintering plate and the surface of the electrolytic cell remelting, which leads to abnormal electrolytic production and cannot maintain normal production

[0005] Generally, when the assembly line is driven after overhaul or stopped and started again, the copper ions in the electrolytic circulating fluid will seriously exceed the standard of 0.3mg / l, and the highest can reach 5.0mg / l, exceeding the quality standard by more than 15 times. The strict method is to start the cycle continuously. Add new solution, and start the car after the copper ion content is lower than 0.3mg / l. The most obvious problem with this method is that a large amount of new solution is wasted. Copper Burning Phenomenon

If the car is not stopped in time, severe copper burning will occur on the tank surface panel. Generally, the tank temperature needs to be controlled at about 38~45°C. When a fault occurs, the tank temperature will quickly rise above 45°C, and the electrolytic production adjustment time can be as long as 5 days. , whether it is the waiting time or the adjustment time, for large-scale production factories, such a long wait is a great waste of cost