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A treatment method for improving the conductivity of anode plates for electrolytic manganese dioxide

A technology of electrolytic manganese dioxide and treatment methods, applied in the direction of electrodes, electrode coatings, electrolytic components, etc., can solve the problems of increased possibility, damage to the anode plate body, thinning of the anode plate, etc., and achieve easy acquisition, improved conductivity, Energy Saving Effect

Active Publication Date: 2021-05-11
GUANGXI ERAMET COMILOG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has a poor operating environment and will cause damage to the anode plate body. After multiple treatments, the anode plate will become thinner and shorten the service life of the anode plate
Another treatment method is to use strong acid (generally more than 20% hydrochloric acid) or strong alkali (generally more than 40% sodium hydroxide) to soak the anode plate at high temperature. This method is essentially the use of chemicals to dissolve residues and Oxides, but the high concentration of acid or alkali used to achieve an effective treatment effect will also corrode the anode plate. At the same time, the hydrochloric acid treatment will also cause titanium hydrogen embrittlement to titanium, shortening the service life of the anode plate, and at the same time It will also increase the possibility of bringing in the controlled impurity Cl

Method used

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  • A treatment method for improving the conductivity of anode plates for electrolytic manganese dioxide
  • A treatment method for improving the conductivity of anode plates for electrolytic manganese dioxide
  • A treatment method for improving the conductivity of anode plates for electrolytic manganese dioxide

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Embodiment 1

[0036] Embodiment 1 (No. 4, 5, 6)

[0037] The electrolytic manganese dioxide production anode plates selected during the production process with poor conductivity and low overcurrent are put back into the normal production electrolytic manganese dioxide electrolytic cell for electrolytic production, and the FLUKE current clamp meter is used to measure through each anode plate Anode plate current. After the measurement, the anode plate is taken out from the electrolytic cell, pretreated and soaked, and then put back into the normal production electrolytic manganese dioxide electrolytic cell for electrolytic production. The current passing through each anode plate is measured with a FLUKE current clamp meter. Taking the measured current as the numerator and the normal current of the unpassivated and normal plate as the denominator, the measured current is converted into a percentage as the current index and compared with the normal current index of the unpassivated plate. In t...

Embodiment 2

[0042] Embodiment 2 (No. 7, 8, 9)

[0043] Part of the process of this embodiment is the same as that of Embodiment 1.

[0044] The weight ratio of hydrogen peroxide and acid waste electrolytic solution in the pretreatment step of the present embodiment is 2:100; Contain sulfuric acid 30g / L, manganese sulfate 80g / L in the acid waste electrolytic solution, the processing time of pretreatment step is 12 hours; The temperature is room temperature;

[0045] Soaking conditions of the present embodiment: add 10% sodium thiosulfate in the acidic waste electrolyte; soak for 48 hours, contain 30 g / L of sulfuric acid and 100 g / L of manganese sulfate in the acidic waste electrolyte, and the treatment temperature is room temperature;

[0046] Results: The average veneer before treatment was 65%, and the average veneer after treatment was 106%.

Embodiment 3

[0047] Embodiment 3 (No. 10, 11)

[0048] Part of the process of this embodiment is the same as that of Embodiment 2.

[0049] The weight ratio of pretreatment step hydrogen peroxide and acid waste electrolyte is 2:100; Contain sulfuric acid 50g / L in acid waste electrolyte, manganese sulfate 100g / L, the treatment time of pretreatment step is 12 hours; Treatment temperature is room temperature;

[0050] Soaking conditions: add 10% sodium thiosulfate to the acidic waste electrolyte; soak for 24 hours

[0051] Results: The average veneer before treatment was 77%, and the average veneer after treatment was 107%.

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Abstract

The invention discloses a treatment method for improving the conductivity of an anode plate for electrolytic manganese dioxide, which comprises the following steps: (1) injecting the acid waste electrolyte produced in the production process of electrolytic manganese dioxide into treatment tank 1 and treatment tank respectively In the second process, after adding hydrogen peroxide in the treatment tank 1, the anode plate with poor conductivity is pretreated to remove the residual electrolytic manganese dioxide on the surface of the anode plate; (2) Add sodium thiosulfate to the acidic waste electrolyte in the treatment tank 2 , Sodium sulfite or sodium pyrosulfate, redox immersion treatment is carried out on the pretreated anode plate; (3) After the immersion treatment is completed, the anode plate is taken out, and it can be reused after washing with clean water. The invention can remove the oxide layer on the surface of the anode plate used for electrolytic manganese dioxide production without causing damage to the anode body, and can prolong the service life of the anode plate.

Description

technical field [0001] The invention relates to the technical field of electrolytic manganese dioxide production, in particular to a treatment method for improving the conductivity of an anode plate for electrolytic manganese dioxide. Background technique [0002] Electrolytic manganese dioxide has the advantages of moderate price, superior discharge performance, and long-term storage. Electrolytic manganese dioxide materials are widely used in primary batteries or secondary batteries. In the current production of electrolytic manganese dioxide, the process of electrolytic manganese sulfate solution is used. The electrolysis process is carried out in the electrolytic cell. The electrolytic cell is filled with acidic electrolyte of manganese sulfate and sulfuric acid. The electrolyte contains sulfuric acid 20-60g / L , manganese sulfate 50-130g / L. The anode plate of the electrolysis reaction is made of pure titanium or titanium alloy, and the cathode plate is made of graphite,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B15/00C25B1/21C25B11/042C25B11/046C23G1/10C23C22/73
CPCC25B1/21C25B15/00C25B11/055
Inventor 陈昌李国新陶书高张学英
Owner GUANGXI ERAMET COMILOG CHEM
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