CN118223077A - A method for purifying cobalt electrolyte - Google Patents

Abstract

The invention relates to the technical field of hydrometallurgy, in particular to a method for purifying cobalt electrolyte, which comprises the following specific implementation steps: step 1, collecting anolyte, conveying the anolyte to a dechlorination system for dechlorination, and removing chlorine dissolved in the anolyte, wherein the flow rate of the anolyte is related to current density; step 2, delivering the anode liquid after dechlorination in the step 1 and the cathode liquid overflowed from the tail of the tank to a filter press for one-time filter pressing to remove insoluble particles and impurities, wherein the filter pressing flow is related to current density; step 3, delivering the anode liquid subjected to primary pressure filtration in the step 2 to a precise filter for precise filtration to remove insoluble particles, wherein the precise filtration flow is related to the current density; the process adopts a filter press and a precise filter for secondary filtration, separates insoluble particles, sundries and insoluble particles for filtration, improves the cleanliness of cobalt electrolyte, reduces the groove cleaning operation, reduces the labor intensity and reduces the safety risk; the physical quality of the electrodeposited cobalt is improved by removing insoluble particles of the cobalt electrolyte.

Description

A method for purifying cobalt electrolyte

Technical Field

The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for purifying cobalt electrolyte.

Background technique

When preparing electrolytic cobalt, the cobalt chloride solution is usually first deeply purified and impurities removed, and then mixed with the cathode liquid overflowing from the electrolytic cell and the anode liquid after dechlorination, and then enters the electrolytic cell; the starting electrode produced by the seed plate is sheared to become the cathode, and the anode is a titanium-coated ruthenium insoluble anode. Under the action of direct current, electrolytic cobalt is precipitated at the cathode and chlorine is produced at the anode. Finally, after a period of electrolysis, the cathode produces an electrolytic cobalt plate, which is sheared, sheared, packaged and stored. However, since the chlorine produced by the anode is highly oxidizing, part of the diaphragm frame and diaphragm bag are powdered and enter the electrolytic system, thereby affecting the cleanliness of the electrolytic solution and thus affecting the physical quality of the electrolytic cobalt.

Summary of the invention

The purpose of the present invention is to provide a method for purifying cobalt electrolyte, which is used to solve the problem that the cleanliness of the electrolytic solution is low during the preparation of the existing electrolytic cobalt, thereby affecting the physical quality of the electrolytic cobalt.

To achieve the above object, the present invention provides the following technical solution: a method for purifying cobalt electrolyte, which is specifically implemented according to the following steps:

Follow these steps to implement it:

Step 1: Collect the anolyte and transport it to the dechlorination system for dechlorination to remove the chlorine dissolved in the anolyte. The flow rate of the anolyte is related to the current density.

Step 2, transporting the anolyte after dechlorination in step 1 and the cathode liquid overflowing from the tail of the tank to a filter press for one-time filtration to remove insoluble particles and impurities, and the filtration flow rate is related to the current density;

Step 3, transporting the anolyte after the primary filtration in step 2 to a precision filter for precision filtration to remove insoluble particles, wherein the precision filtration flow rate is related to the current density;

Step 4: returning the anode liquid after precise filtration described in step 3 and the high-concentration cobalt chloride solution after impurities removal to the electrowinning system, wherein the cobalt concentration is related to the current density.

Furthermore, the anolyte flow rate of step 1 is 120-160 ml/(A·m2·tank).

Furthermore, the cathode liquid flow rate of step 2 is 40-80 ml/(A·m2·slot), the primary filtrate flow rate is 160-240 ml/(A·m2·slot), and the filter cloth model is one of 747, 858, and monofilament filter cloth.

Furthermore, the precision filtration flow rate of step 3 is 150-230 ml/(A·m2·slot).

Furthermore, the cobalt concentration of the prepared solution in step 4 is 50-80 g/L.

Compared with the prior art, the present invention has the following beneficial effects:

The present invention has the following beneficial effects:

This process uses a filter press and a precision filter for secondary filtration to separate insoluble particles, debris, and insoluble microparticles, thereby improving the cleanliness of the cobalt electrolyte, reducing tank cleaning operations, lowering labor intensity, and reducing safety risks; and improving the physical quality of electrolytic cobalt by removing insoluble microparticles from the cobalt electrolyte.

Attached photos

Figure 1 is a flow chart of cobalt electrolyte purification.

Detailed ways

The present invention is described in detail below in conjunction with specific implementation modes.

A method for purifying cobalt electrolyte is implemented in the following steps:

Embodiment 1

experiment procedure:

Step 1: Collect the anolyte and transport it to the dechlorination system for dechlorination. The anolyte flow rate is 140 ml/(A·m2·tank).

Step 2: The dechlorinated anolyte and the cathode liquid overflowing from the tail of the tank are transported to the filter press for one filtration, with a filtration flow rate of 200 ml/(A·m2·tank).

Step 3: After the first filtration, the liquid is transported to the precision filter for precision filtration, and the precision filtration flow rate is 200 ml/(A·m2·tank).

Step 4: The liquid after precision filtration and the high-concentration cobalt chloride solution after impurities removal are mixed and returned to the electrolytic system to prepare the cobalt concentration of the liquid to 60g/L.

Experimental results:

The experimental results are shown in Table 1.

Table 1 Physical quality of electrolytic cobalt

The experimental results of Example 1 show that the cobalt electrolyte obtained through the experimental process of Example 1 has high cleanliness and the physical quality of the produced cobalt plate is good.

Embodiment 2:

experiment procedure:

Step 1: Collect the anolyte and transport it to the dechlorination system for dechlorination. The anolyte flow rate is 160 ml/(A·m2·tank).

Step 2: The dechlorinated anolyte and the cathode liquid overflowing from the tail of the tank are transported to the filter press for one filtration, and the filtration flow rate is 230 ml/(A·m2·tank).

Step 3: After the first filtration, the liquid is transported to the precision filter for precision filtration, and the precision filtration flow rate is 230 ml/(A·m2·tank).

Step 4: The liquid after precision filtration and the high-concentration cobalt chloride solution after impurities removal are mixed and returned to the electrolytic system to prepare the cobalt concentration of the liquid to 65g/L.

Experimental results:

The experimental results are shown in Table 2.

Table 2 Physical quality of electrolytic cobalt

The experimental results of Example 2 show that the cobalt electrolyte obtained through the experimental process of Example 2 has high cleanliness and the physical quality of the produced cobalt plate is good.

Claims (5)

1. A method for purifying cobalt electrolyte, which is characterized by comprising the following steps:

step 1, collecting anolyte, conveying the anolyte to a dechlorination system for dechlorination, and removing chlorine dissolved in the anolyte, wherein the flow rate of the anolyte is related to current density;

Step 2, delivering the anode liquid after dechlorination in the step 1 and the cathode liquid overflowed from the tail of the tank to a filter press for one-time filter pressing to remove insoluble particles and impurities, wherein the filter pressing flow is related to current density;

step 3, delivering the anode liquid subjected to primary pressure filtration in the step 2 to a precise filter for precise filtration to remove insoluble particles, wherein the precise filtration flow is related to the current density;

and 4, mixing the anode liquid after the precise filtration in the step 3 with the high-concentration cobalt chloride solution after impurity removal, and returning the mixture into an electrodeposition system, wherein the cobalt concentration is related to the current density.

2. The method for purifying a cobalt electrolyte according to claim 1, wherein the anolyte flow rate in the step1 is 120-160 ml/(a.m2.tank).

3. The method for purifying cobalt electrolyte according to claim 1, wherein the catholyte flow in the step 2 is 40-80 ml/(a.m2. Tank), the primary press filtrate flow is 160-240 ml/(a.m2. Tank), and the filter cloth type is one of 747, 858 and monofilament filter cloth.

4. The method for purifying a cobalt electrolyte according to claim 1, wherein the fine filtration flow rate in the step 3 is 150 to 230 ml/(a.m2.multidot.tank).

5. The method for purifying a cobalt electrolyte according to claim 1, wherein the concentration of cobalt in the formulation of step 4 is 50-80g/L.