An electrolytic manganese production system for energy saving and consumption reduction

Abstract

The invention discloses an electrolytic manganese production system for energy saving and consumption reduction, which mainly includes an electrolytic cell, a balance buffer tank, a heat exchanger, a continuous crystallization tank, a water source heat pump, an oven, a centrifugal filter, a filter press, a slurry tank, a leaching barrel, and thus constitute: the main circulation loop of electrolytic production, the catholyte small circulation loop for extracting manganese slag, and the catholyte cooling loop for cooling bath liquid, so as to realize the efficient recovery of soluble manganese in manganese slag and the efficient conversion of Joule heat generated by electrolysis and take full advantage. The invention greatly reduces the energy consumption and material consumption of electrolytic production, has remarkable benefits, and will play an important role in solving the energy saving and emission reduction of the industry.

Description

technical field [0001] The invention relates to a hydrometallurgical electrolytic metal production system, in particular to an electrolytic metal manganese production system that saves energy and reduces consumption. Background technique [0002] Traditional electrolytic manganese metal production: the electrolyte flows from the cathode chamber through the diaphragm bag into the anode chamber, the anolyte generated in the anode chamber flows into the false bottom of the anode, and then flows out from the upper edge of the electrolytic cell through an isolation channel, and the anolyte enters the leaching barrel. Add sulfuric acid to leach manganese ore powder, and the leaching solution is purified and filtered before returning to electrolysis. Mn during electrolysis 2+ Metal manganese is precipitated on the cathode plate in the cathode chamber, and the electrothermal effect is generated to release Joule heat. In addition to the anolyte being taken away, the tank surface eva...

AI Technical Summary

Problems solved by technology

Mn during electrolysis 2+ Metal manganese is precipitated on the cathode plate in the cathode chamber, and the electrothermal effect is generated to release Joule heat. In addition to the anolyte being taken away, the tank surface evaporating, and the tank body dissipating heat, there is also a large amount of heat accumulated in the tank. "China Manganese Industry Technology" No. Chapter 20 gives the data obtained from theoretical calculations and actual measurements in the production plant: 4.6×10³KJ of heat is required to be extracted for every 1Kg of manganese metal precipitated (high temperature daily value in summer), due to the disadvantages of traditional tank cooling: heat transfer efficiency Poor, large amount of cooling water (200-250 m³ of cooling water is required to produce 1 ton of product, which is 4 to 5 times the electrolyte circulation volume), and there are many losses such as water evaporation, blowing, and leakage (1.5 manganese loss per ton of product produced ~2m³ cooling water), the impurities in the electrolyte in the tank are easy to accumulate, and the scale is fast, which affects the electrolysis efficiency and product quality. Many disadvantages have caused many manufacturers to try cooling outside the tank, but no good technical results have been seen so far. There was a patent in the early years CN01111708.3 (a kind of cooling of manganese electrolysis catholyte and the reclaiming method of magnesium), also does not obtain industrial implementation, has the following shortcoming: 1. the concentration of manganese in the liquid entering the tank is low, and the temperature of the liquid entering the tank is relatively high. The amount of heat exchange and quality (manganese) exchange is difficult to operate and control, and the catholyte circulation is large, which is more than three times that of the electrolyte, and the energy consumption is high; Restricted, it is difficult to achieve precise control of the tank temperature (41 ~ 43 ℃); ③ crystallization will occur in large quantities in the evaporation tower, chute and liquid collection pool, and it is troublesome to clean up

[0003] my country has a large output of electrolytic manganese, accounting for more than 95% of the world's total. Except for a part of imported manganese ore, the rest is my country's own ore, and the grade of manganese ore in my country is low. The grade has been reduced from the original 14-18% to 10-13% (some have also been enriched by magnetic separation), and the manganese concentration of the prepared qualified liquid has also changed from the original Mn-containing 2+ 36~38g / L down to containing Mn 2+ 34~35g / L, the qualified solution contains Mn 2+ If the amount is low, it will increase the liquid consumption of manganese per ton of product, thereby increasing the circulation of electrolytic liquid, which will inevitably increase the load of leaching and filtration and the consumption of auxiliary materials in the process of liquid preparation, sometimes causing difficulty in liquid supply and production failure. It is normally carried out, although the operating rate of the production lines of many manufacturers is not high, and there are enough production lines to cope with the production, but the production cost is high, so far no Mn-containing 2+ Manufacturers who produce qualified liquid below 34g / L and obtain good economic benefits; if low-grade manganese ore powder is used to produce high-concentration liquid, the manganese slag will bring out a large amount of manganese, the yield of manganese will decrease, and there will be no economic benefits. Application problems of low-grade ore

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