Method for reducing lead content of lead anode slime and improving lead ion concentration of electrolyte

Abstract

The invention belongs to the technical field of lead electrolysis, and discloses a method for reducing the lead content of lead anode slime and improving the lead ion concentration of electrolyte, the anode slime is washed by using the lead electrolyte, and lead in the anode slime is dissolved into washing liquid to be enriched by controlling the washing liquid-solid ratio, the stirring temperature and the stirring time, so that the lead content of the anode slime is reduced, and the lead ion concentration of the electrolyte is improved. And the obtained washing liquid is subjected to filter pressing to realize liquid-solid separation, and the filtrate with high lead ion concentration is supplemented into an electrolysis circulation system from a low tank after being clarified, so that the lead ions in the electrolyte are supplemented, the stability of the system is maintained, and high-current-density electrolysis is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of lead electrolysis, and in particular relates to a method for reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte. Background Art

[0002] In recent years, with the further contraction of lead processing space, more and more lead smelting enterprises have reduced the use of high-grade lead concentrates and switched to using miscellaneous ores with high gold, silver and copper content or even various slag materials to increase the output of gold, silver and copper and increase the added value of lead refining. At present, lead electrolysis mainly adopts large-plate and long-cycle electrolysis process. In the actual production process, the current density of lead electrolysis is often increased to reduce the time that high-rich and high-value materials stay and accumulate in the production process, so as to achieve the purpose of rapid realization of high-value materials and avoid the operating risks brought by market price changes as much as possible.

[0003] However, with the decrease of the main lead grade of the raw materials, the increase of rich and impurity elements, and the electrolysis under high current density conditions, the depletion of lead ions in the electrolyte becomes more and more serious. The depletion of lead ions in the electrolyte seriously affects the stability of the lead electrolysis system, seriously affects the current efficiency, and even causes the deterioration of the precipitated lead crystallization, the increase of impurities, and the unqualified quality of lead ingot products.

[0004] In addition, the increase in raw material impurities has changed the lead composition in the lead electrolysis anode mud. The content of combined and insoluble lead has increased, causing the lead content in the anode mud to remain high, resulting in direct loss of lead metal and seriously affecting production and operations.

[0005] Therefore, it is an urgent problem for technicians in this field to provide a method to reduce the lead content of lead anode mud and increase the lead ion concentration of electrolyte. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a method for reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A method for reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte. The method comprises washing the anode mud with electrolyte to obtain washing liquid for replenishing the lead ions in the electrolyte.

[0009] Preferably, the electrolyte contains H2SiF680-100g / L.

[0010] Preferably, the liquid-to-solid ratio of the washing is 3:1.

[0011] The anode mud electrolyte is extracted from the electrolytic low-level tank. When the electrolyte is insufficient, the lead ion concentration in the solution is saturated and the washing effect is poor; when the electrolyte is excessive, it is difficult to maintain a balanced system volume.

[0012] Preferably, the washing temperature is 40-50°C.

[0013] When the washing temperature is low, the anode mud washing effect is poor, and when the temperature is high, it will aggravate the decomposition of silicic acid in the electrolyte.

[0014] Preferably, the washing time is 45-60 minutes.

[0015] Preferably, the stirring speed of the washing is 200-300 rpm.

[0016] Preferably, the electrolyte is selected from an electrolytic low-level tank.

[0017] Preferably, the washing liquid is subjected to solid-liquid separation to obtain a supernatant.

[0018] Preferably, the solid-liquid separation is performed by filter press, and the clarification time of the filtrate is not less than 24 hours.

[0019] Preferably, the washing liquid is added to the lead electrolysis low-level tank.

[0020] Preferably, the washing liquid is added to the lead electrolysis low-level tank 4-6 times per day.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides a method for reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte. The present invention adopts electrolyte as washing liquid. Since the electrolyte is acidic and contains H2SiF6, the lead in the anode mud can be washed out in the form of lead ions as much as possible, and the lead in the lead anode mud can be reduced to below 12%, thereby achieving the effect of reducing the lead content of the lead anode mud. Washing water containing more than 200g / L of lead ions is returned to the electrolysis system to supplement the lead ions in the electrolyte, maintain the stability of the system, and realize high current density electrolysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 The process flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Raw materials: The composition of lead electrolyte is (g / L): H2SiF680-100, Pb 2+ 40-60; Anode mud contains 21% Pb;

[0027] Example 1

[0028] like Figure 1 The present invention provides a method for reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte, comprising the following specific steps:

[0029] Lead electrolysis crude lead raw material main grade Pb 95%, electrolysis current density 178A / m 2 The electrolysis cycle is 5 days; the mud washed by the residual anode washing machine enters the primary filter press for liquid-solid separation, and the produced primary filter cake is put into the stirring tank. The electrolyte (component g / L: H2SiF685, Pb 2+ 52), control the liquid-to-solid ratio to 3:1, introduce steam, and continue stirring for 50 min after the temperature rises to 42°C, with a stirring rate of 240 r / min;

[0030] After the treatment is completed, the mud is pumped into the secondary filter press to separate the liquid and solid. The produced anode mud contains 11.25% lead and the filtrate contains 205.4g / L lead ions. After the filtrate is clarified in the clarification tank for 24 hours, it is replenished into the electrolysis low-level tank 4 times a day. The lead ion concentration of the electrolyte in the electrolysis system increased from 45.2g / L to 87.7g / L, ensuring the stability of the system.

[0031] Example 2

[0032] like Figure 1 The present invention provides a method for reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte, comprising the following specific steps:

[0033] Lead electrolysis crude lead raw material main grade Pb 93.8%, electrolysis current density 185A / m 2 The electrolysis cycle is 5 days; the mud washed by the residual anode washing machine enters the primary filter press for liquid-solid separation, and the produced primary filter cake is put into the stirring tank. The electrolyte (component g / L: H2SiF692, Pb 2+48), control the liquid-to-solid ratio to 3:1, introduce steam, and continue stirring for 55 min after the temperature rises to 43.5°C, with a stirring rate of 265 r / min;

[0034] After the treatment is completed, the mud is pumped into the secondary filter press to separate the liquid and solid. The produced anode mud contains 10.62% lead and the filtrate contains 211.2g / L lead ions. After the filtrate is clarified in the clarification tank for 28 hours, it is replenished into the electrolysis low-level tank 5 times a day. The lead ion concentration of the electrolyte in the electrolysis system increased from 43.6g / L to 92.3g / L, ensuring the stability of the system.

[0035] The various embodiments are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to in detail.

[0036] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte, characterized in that: The method comprises the following steps: washing anode mud with electrolyte to obtain washing liquid for replenishing lead ions in the electrolyte.

2. The method for reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte according to claim 1, characterized in that: The electrolyte contains H2SiF680-100g / L.

3. The method for reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte according to claim 1, characterized in that: The liquid-to-solid ratio of the washing is 3:

1.

4. The method of reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte according to claim 1, characterized in that: The washing temperature is 40-50°C.

5. The method of reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte according to claim 1, characterized in that: The washing time is 45-60 minutes.

6. The method of reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte according to claim 1, characterized in that: The stirring speed of the washing is 200-300 rpm.

7. The method of reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte according to claim 2, characterized in that: The electrolyte is selected from the electrolytic low-level tank.

8. The method of reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte according to claim 1, characterized in that: The washing liquid is subjected to solid-liquid separation to obtain a supernatant.

9. The method for reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte according to claim 8, characterized in that: The solid-liquid separation is carried out by filter pressing, and the clarification time of the filtrate is not less than 24 hours.

10. The method of reducing the lead content of lead anode mud and increasing the lead ion concentration of electrolyte according to claim 1, characterized in that: The washing liquid is added into the lead electrolysis low-level tank.

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