CN103726067B - A kind of electrolysis system producing electrolytic manganese dioxide - Google Patents

Abstract

The invention relates to an electrolysis system for producing electrolytic manganese dioxide, which includes an electrolyte preheating device and an electrolysis device. The electrolysis device includes a tank body. There are several cathode areas separated between them, and the electrolyte in the preheating device is pumped to each cathode area, an anode plate is inserted in the anode area, and a cathode plate is inserted in each cathode area. In the present invention, the electrolyte is preheated in a concentrated manner, and then transported to each cathode area, so that the electrolyte in the electrolysis device is quickly electrolyzed, and the electrolysis efficiency is improved; at the same time, the cathode area adopts a stepped tank bottom, and when the cathode area with the deepest tank bottom is connected to When entering the electrolyte, it is only necessary to start the electrolysis of the cathode plates in this area, so that the cathode plates can be started one by one, thereby lowering the cost of electrolysis; the invention also uses a heat conduction oil heating device for heating, which can not only accurately control the heating temperature, but also avoid Pollution of electrolytic products, thereby improving product quality.

Description

An electrolysis system for producing electrolytic manganese dioxide

technical field

The invention relates to the preparation of electrolytic manganese dioxide manganese, in particular to an electrolytic system for producing electrolytic manganese dioxide.

Background technique

At present, electrolytic manganese dioxide has high purity, good crystal form, large discharge capacity and strong activity. It is an excellent battery depolarizer. Because of its good discharge performance, it has become a very important raw material for the battery industry. The existing electrolytic manganese dioxide (EMD) production methods mostly use the H2SO4-MnSO4 electrolysis process. The electrolysis process usually uses lead, lead-based alloys, graphite or pure titanium, titanium alloys, noble metal oxide coatings, etc. as the anode, graphite rods or stainless steel as the cathode, and manganese sulfate solution as the electrolyte. Low-voltage direct current causes divalent manganese ions to lose electrons on the anode (oxidation reaction occurs) and finally precipitates manganese dioxide. The crude manganese dioxide deposited on the anode is stripped, pulverized, rinsed, neutralized and dried to obtain the finished electrolytic manganese dioxide.

In order to reduce the cost of production equipment, simplify the production process, improve the quality of electrolytic manganese dioxide products, and improve the efficiency of electrolysis, it is often necessary to heat the electrolyte during the electrolysis process. The commonly used electrolyte heating method is to install an electrolyte heating tube in the electrolytic cell, and pass in saturated steam at 110-150°C during the electrolysis process, and keep the temperature of the electrolyte within the set range through the heat exchange of the electrolyte heating tube. . Based on the good thermal conductivity of metal copper, copper pipes are usually considered for the electrolyte heating pipe. However, due to the high concentration of sulfuric acid contained in the electrolyte, the dissolution of copper will be accelerated under high temperature conditions, which will easily cause the copper heating pipe to be corroded and damaged. ; More importantly, if copper enters the electrolyte, it is likely to be adsorbed by electrolytic manganese dioxide to cause product pollution, thereby reducing product quality.

Contents of the invention

Aiming at the above-mentioned shortcomings of the prior art, the present invention provides an electrolysis system for producing electrolytic manganese dioxide that can precisely control the heating temperature, has low cost, and produces high-quality products.

The present invention adopts the following technical solutions to solve the above technical problems: an electrolysis system for producing electrolytic manganese dioxide, including an electrolyte preheating device and an electrolysis device, the electrolysis device includes a tank body, and the middle of the tank body is an anode area surrounded by a diaphragm , Between the anode area and the tank body, there are several cathode areas. The electrolyte in the preheating device is pumped to each cathode area. An anode plate is inserted in the anode area, and a cathode plate is inserted in each cathode area.

Further, the bottom of the tank between the anode region and the tank body is stepped, and the step surface of each step is the bottom surface of a cathode region.

Preferably, the preheating device is a container, and several liquid outlet pipes are arranged on the wall of the container, each liquid outlet pipe communicates with one of the cathode regions, and each liquid outlet pipe is equipped with a said pump.

Preferably, the container wall and the tank body are provided with an interlayer, and a heat-conducting oil pipe is installed in the interlayer, and the temperature of the heat-conducting oil pipe is controlled by a heat-conducting oil heating device.

Preferably, a waste liquid outlet is provided at the bottom of the tank.

Preferably, an insulating layer is provided on the liquid outlet pipe.

Compared with the prior art, the present invention has the following advantages:

1. In the present invention, the electrolyte is preheated in a concentrated manner, and then transported to each cathode area, so that the electrolyte in the electrolysis device is quickly electrolyzed, and the electrolysis efficiency is improved;

2. The cathode area adopts a stepped tank bottom. When the electrolyte is introduced into the deepest cathode area at the bottom of the tank, it is only necessary to start the electrolysis of the cathode plates in this area, so that the cathode plates can be started one by one, thereby reducing the cost of electrolysis;

3. The present invention adopts a heat conduction oil heating device for heating, which not only can accurately control the heating temperature, but also avoids polluting the electrolytic product, thereby improving product quality.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the sectional schematic view of preheating device among the present invention;

Fig. 3 is a schematic top view of the electrolysis device in the present invention.

detailed description

Below in conjunction with Fig. 1, Fig. 2 and Fig. 3 describe the present invention in detail:

The electrolysis system of the present invention includes an electrolyte preheating device 1 and an electrolysis device 2, the electrolysis device includes a tank body 21, the middle of the tank body is an anode area 22 surrounded by a diaphragm 3, and the anode area and the tank body are separated by several Each cathode area 23, the electrolytic solution in the preheating device 1 is transported to each cathode area by a pump 4, an anode plate 24 is inserted in the anode area, and a cathode plate 25 is inserted in each cathode area. The electrolyte can be preheated intensively through the preheating device, and then transported to each cathode area. Once the electrolyte reaches the electrolysis device, rapid electrolysis can be performed to improve the electrolysis efficiency.

As another object of the present invention, the tank bottom between the anode region and the tank body is stepped, and the step surface of each step is the bottom surface of a cathode region. During the electrolysis process, when there is less electrolytic solution, the electrolyte can be introduced into the deepest cathode area at the bottom of the tank first, and only the cathode plate in this area needs to be electrolyzed; when the liquid level of the electrolyte rises gradually, it will be submerged one by one On the bottom surface of other cathode regions, the cathode plates of other cathode regions are activated one by one at this time, and electrolyte solution can be delivered to the activated cathode regions one by one at the same time. This design can reasonably control the electrolysis process according to the amount of electrolyte, thereby avoiding some unnecessary waste and lowering the cost of electrolysis.

As preferably, the preheating device 1 is a container 11, and several liquid outlet pipes 12 are arranged on the wall of the container, and each liquid outlet pipe communicates with one of the cathode regions, and the pump is installed on each liquid outlet pipe. 4. The flow rate of the electrolyte can be precisely controlled to control the replenishment of the electrolyte, so as to achieve the purpose of timely and rapid replenishment of the electrolyte. As a preference, an insulation layer 13 is provided on the outlet pipe to prevent heat loss and achieve an insulation effect.

In the present invention, the container wall and the tank body are provided with an interlayer 5, and a heat-conducting oil pipe 6 is installed in the interlayer. The temperature of the heat-conducting oil pipe is controlled by a heat-conducting oil heating device 7, which not only can accurately control the heating temperature, but also can avoid Pollution of electrolytic products, thereby improving product quality. Preferably, the bottom of the tank is provided with a waste liquid outlet 8, which can recycle the waste liquid.

Above shows and described basic principle of the present invention and main feature and the advantage of the present invention, those skilled in the art should understand that, the present invention is not limited by above-mentioned embodiment, what described in above-mentioned embodiment and description just illustrates the present invention Principle, under the premise of not departing from the spirit and scope of the present invention, the present invention also has various changes and improvements, and these changes and improvements all fall within the claimed scope of the present invention, and the claimed protection scope of the present invention is defined by the appended claims Requirements and their equivalents are defined.

Claims (5)

1. An electrolytic system for producing electrolytic manganese dioxide, comprising an electrolytic solution preheating device and an electrolytic device, is characterized in that: the electrolytic device comprises a tank body, the middle of the tank body is an anode area surrounded by a diaphragm, and the anode area and The tank body is divided into several cathode areas, the electrolyte in the preheating device is pumped to each cathode area, the anode area is inserted with an anode plate, and each cathode area is inserted with a cathode plate; the anode area and the tank body The groove bottom between them is stepped, and the stepped surface of each step is the bottom surface of a cathode region. 2. The electrolysis system according to claim 1, characterized in that: the preheating device is a container, the wall of the container is provided with several liquid outlet pipes, each liquid outlet pipe communicates with one of the cathode regions, each The pump is installed on a liquid outlet pipe. 3. The electrolysis system according to claim 2, characterized in that: the container wall and the tank body are provided with an interlayer, and a heat-conducting oil pipe is installed in the interlayer, and the temperature of the heat-conducting oil pipe is controlled by a heat-conducting oil heating device. 4. The electrolysis system according to claim 1, characterized in that: the bottom of the tank is provided with a waste liquid discharge port. 5. The electrolysis system according to claim 2, characterized in that: the liquid outlet pipe is provided with an insulating layer.