A new production process of electrolytic manganese with energy saving and consumption reduction

Abstract

The invention discloses a new energy-saving and consumption-reducing electrolytic manganese production process, in which the catholyte is made into a small circulation outside the electrolytic cell, as an aid to the circulation of the original electrolyte, and the low-manganese-containing catholyte is used to replace the high-manganese-containing manganese slag Qualified liquid, used to replenish the amount of manganese metal in the tank; use the heat pump principle to convert the heat accumulated in the catholyte into hot air and hot water, which is used to dry manganese sheets, heat the anolyte, and the cooled catholyte to regulate the electrolytic cell temperature. The invention has small investment, can utilize the existing system to realize high-efficiency energy saving and emission reduction, and has obvious industrial application prospect.

Description

technical field [0001] The invention relates to the hydrometallurgical electrolytic metal production technology, in particular to the electrolytic metal manganese production technology. Background technique [0002] Traditional electrolytic manganese metal production process: 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 , adding sulfuric acid to leach manganese ore powder, and the leachate 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 evaporating, and the tank body ...

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 (manganese loss of 1.5 to 1 ton per ton produced) 2m³ cooling water), the impurities in the electrolyte in the tank are easy to accumulate, and the scaling 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 achievements have been seen so far. In the early years, there was a patent CN01111708 .3 (a kind of cooling of manganese electrolysis catholyte and the reclaiming method of magnesium), also do not obtain industrial implementation, there is following shortcoming: 1. the manganese concentration of entering tank liquid is low, and entering tank liquid temperature is relatively high, will satisfy the heat in the tank simultaneously It is difficult to operate and control the exchange volume and mass (manganese) exchange volume, and the catholyte circulation volume is large, which is more than three times the electrolyte circulation volume, and the energy consumption is high; , it is not easy to achieve precise control of the tank temperature (41-43°C); ③ a large number of crystals will occur 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 global output. 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 of powder has dropped 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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