CN109295478B

CN109295478B - Preparation method of aluminum-manganese alloy

Info

Publication number: CN109295478B
Application number: CN201811460017.XA
Authority: CN
Inventors: 石长存; 沈利; 于水; 田明生; 许晶; 黄文俊; 迟立新; 颜维阁; 田友良; 闫磊; 王德; 闫存定; 王青; 谢文海; 武浩达
Original assignee: Inner Mongolia Huayun New Material Co ltd; Baotou Aluminium Co ltd
Current assignee: Inner Mongolia Huayun New Material Co ltd; Baotou Aluminium Co ltd
Priority date: 2018-11-30
Filing date: 2018-11-30
Publication date: 2021-02-26
Anticipated expiration: 2038-11-30
Also published as: CN109295478A

Abstract

The invention provides a preparation method for obtaining an aluminum-manganese alloy by using manganese oxide as a main raw material and electrolyzing in an aluminum electrolysis cell. The invention only utilizes the existing prebaked anode aluminum electrolytic cell, and realizes the industrial batch continuous production of the aluminum-manganese alloy by the aluminum electrolytic cell under the condition of not increasing any equipment investment. The method can effectively control the fluctuation of the electrolytic production process caused by the violent reaction after the raw materials are added in a reasonable range, and can accurately control the manganese content in the aluminum-manganese alloy. The utilization rate of the manganese oxide raw material is high, and the obtained aluminum-manganese alloy has the characteristics of high content, small segregation and uniform components.

Description

Preparation method of aluminum-manganese alloy

The technical field is as follows:

the invention relates to a preparation method of an aluminum-manganese alloy, in particular to a method for preparing the aluminum-manganese alloy by using an aluminum electrolytic cell.

Background art:

at present, two methods, namely a counter doping method and an aluminothermic reduction method, are generally adopted for the industrial production of the aluminum manganese alloy. The counter-doping method has two modes: firstly, manganese-containing manganese additive is mixed with pure aluminum, the manganese additive is composed of pure manganese and combustion improver, and the method has the following defects: because the manganese additive is burnt strongly in the adding process, a large amount of smoke is generated, and serious pollution is caused; secondly, pure manganese and pure aluminum are used for doping, and the method has the defects of low utilization rate of manganese raw materials, serious component segregation and difficult control of component content; and the doping method has the problem of high raw material cost due to the high price of the metal manganese. The aluminothermic reduction method is to produce the aluminum-manganese alloy by taking manganese oxide as a raw material and metallic aluminum as a reducing agent and carrying out reduction reaction at high temperature, but the aluminum oxide displaced by the method is slag, so that the aluminum loss is serious, the slag is difficult to remove, the quality deviation of the melt is caused, and the defects of the produced aluminum-manganese alloy are serious.

The current laboratory-stage methods for producing aluminum-manganese alloys are also divided into two categories: one is manganese-containing anode electrolysis, and the other is molten salt electrolysis using a crucible or other small container. The manganese-containing anode electrolysis method is characterized in that manganese oxide is added into anode ingredients to prepare a carbon anode, and during the electrolysis process, the manganese oxide is separated out, enters into electrolyte along with the consumption of the anode, and is separated out together with aluminum at a cathode through electrolysis to form aluminum-manganese alloy, wherein the method has the defects that: the manganese raw material has low utilization rate, serious composition segregation, difficult control of composition content, large anode resistance and high energy consumption, and because of the addition of the manganese element, the compressive strength of the anode is small, the anode quality is poor, the consumption is increased, the production cost is increased, and the manganese content of the aluminum-manganese alloy is low. The molten salt electrolysis method using a crucible or other small containers cannot realize industrial production.

Patent CN201610104761 discloses a process for producing alloy aluminum in an aluminum electrolysis cell by using aluminum reduction alloy oxide, which is that oxide of required alloy elements is added into aluminum liquid in the aluminum electrolysis cell through a dielectric layer in the aluminum electrolysis production process. The alloy element is an alloy element with stronger oxidability than aluminum; the method for putting the oxides of the alloy elements into the molten aluminum comprises the following steps: when the electrode is changed, the anode is added from the opened anode opening, added from the fire hole opening or added by another opening.

There are problems that: firstly, among alloy elements with oxidability stronger than that of aluminum, manganese, chromium and the like react with aluminum violently, and the excessive feeding amount easily causes the change of the technical conditions of the electrolysis process and influences the normal electrolysis production; meanwhile, in the electrolytic production process, a certain amount of original aluminum liquid needs to be extracted from the stock aluminum of the electrolytic cell every day for casting, so that the dynamic balance process is realized, and the content of metal elements in the stock aluminum can be stably improved by taking full consideration. Aiming at the situation, scientific and reasonable feeding amount needs to be designed to stabilize the production process, and simultaneously, the content of metal elements in the stock aluminum is increased according to expectation. The patent does not explicitly give a method for controlling and calculating the amount of the feed, and the purpose of the patent is not easily achieved by the method.

Secondly, the oxide of the needed alloy element is added into the aluminum liquid in the aluminum electrolytic cell through the dielectric layer, and the practical situation is that the electrolyte layer is arranged above the aluminum liquid layer in the electrolytic cell, and the electrolyte layer is flowing and has the characteristics of high temperature, strong corrosivity and the like. The device can realize stable and continuous corrosion resistance and high temperature resistance which can penetrate through the electrolyte layer and be added into the aluminum liquid layer, and the content mentioned in the patent is not easy to realize.

Thirdly, at the time of charging, because a certain amount of raw aluminum liquid needs to be extracted from the stock aluminum of the electrolytic cell every day for casting, the process is a dynamic balance process, if the charging time is improper, the added metal element oxide can be extracted along with the daily raw aluminum without complete reaction, so that the unnecessary consumption of raw materials is caused, and the pollution of the raw aluminum liquid and the increase of the cost are caused.

The invention content is as follows:

in order to overcome the defects in the background technology, the invention aims to provide a method for realizing the industrial batch continuous production of aluminum-manganese alloy by using an aluminum electrolytic cell by fully utilizing a pre-baked anode aluminum electrolytic cell in production and directly adding manganese oxide in the aluminum electrolytic process. The method has the advantages of stable production, low energy consumption, high efficiency and high quality.

The purpose of the invention is implemented by the following technical scheme: a preparation method of aluminum-manganese alloy is prepared by an aluminum electrolytic cell, and comprises the following steps: (1) measuring nNaF AlF in the electrolyte of an aluminum electrolysis cell in a producing aluminum electrolysis cell₃N is a constant of 2.1 to 2.9; KF; CaF₂；MgF₂；LiF；AL₂O₃Wherein the nNaF. AlF₃62 to 94 percent; KF is 0.1-8%; CaF₂1-8%; MgF₂1-8%; LiF accounts for 1-8%; AL₂O₃2-7%, and the mass percentage of the components is 100%; (2) when the measured values are within the above ranges, the oxides of manganese are added and the technical conditions of the electrolytic process are detected and maintained: the electrolysis temperature is 900-960 ℃, the average voltage is 3.5-4.3V, and the aluminum-manganese alloy is obtained.

Further, adding manganese oxide into the aluminum electrolytic cell according to the step (2), wherein the electrolytic process comprises at least one aluminum-manganese alloy electrolytic cycle, and the aluminum-manganese alloy electrolytic cycle comprises: a manganese content rising period and a manganese content balancing period; wherein the manganese content rising period is an electrolysis process before the mass percentage of manganese in the aluminum stored in the aluminum electrolysis cell reaches a set value, and the mass percentage of manganese in the stored aluminum continuously rises at the stage; the manganese content balancing period is an electrolysis process after the mass percentage of manganese in the aluminum stored in the aluminum electrolysis cell reaches a set value, and the mass percentage of manganese in the stored aluminum is kept unchanged at the stage.

Further, in the manganese content rising period in the electrolytic process, manganese oxide is added, and the specific steps comprise:

determining the daily lifting rate of the manganese content according to the content of manganese in the aluminum measured in the current electrolytic cell by detection and analysis; calculating the daily feeding amount of the manganese oxide in the manganese content rising period;

the daily charge calculation formula of the manganese oxide in the manganese content rise period is as follows:

wherein, W_{Lifting of wine}The daily charge (kg), Q, of oxides of manganese in the manganese content rise phase_DishThe mass (kg) of aluminum stored in the aluminum cell, a₁Is the actual detection value (%) of the manganese content in the aluminum in the amount of the aluminum stored in the aluminum electrolytic cell on the day, a₂The mass percentage (%) of manganese in the aluminum which is expected to be reached in the amount of the aluminum stored in the aluminum electrolytic cell on the next day (a)₂-a₁) The daily rise rate (%) of the manganese content, Q_{Product produced by birth}The content of the aluminum in the aluminum electrolytic cell is the sunrise aluminum amount (kg), P is the raw material utilization rate (%) of the manganese oxide, C is the purity (%) of the manganese oxide, and m is the mass percent content (%) of the manganese in the manganese oxide.

Further, when the manganese content of the aluminum stored in the electrolytic cell is less than 3 percent by mass percent, the daily lifting rate of the manganese content is less than or equal to 0.5 percent per day; when the manganese content of the aluminum in the electrolytic cell is more than or equal to 3% and less than 6%, the daily lifting rate of the manganese content is less than or equal to 0.3%/day, and when the manganese content of the aluminum in the electrolytic cell is more than or equal to 6% and less than 10%, the daily lifting rate of the manganese content is less than or equal to 0.15%/day.

Further, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to I/b; wherein, I is a series current (kA), and b is a constant satisfying: b is 5 kA/kg.

Further, in the manganese content rising period in the electrolytic process, the manganese oxide addition time is as follows: the starting point of the daily addition of the oxides of manganese is after the aluminium is tapped from the aluminium electrolysis cell.

Further, in the manganese content balance period, the manganese content of the aluminum in the aluminum cell is controlled to be kept unchanged, and the method specifically comprises the following steps:

calculating the daily charge of oxides of manganese during the equilibrium period of manganese content

The daily charge calculation formula of the manganese oxide with the manganese content in the equilibrium period is as follows:

wherein, W_{Flat plate}The daily charge (kg), Q, of oxides of manganese in equilibrium periods of manganese content_{Product produced by birth}The sunrise aluminum amount (kg) of the aluminum electrolytic cell, a_{Flat plate}The method comprises the following steps of determining the mass percent content (%) of manganese in aluminum in the memory amount of the aluminum electrolytic cell in the manganese content equilibrium period, determining P as the raw material utilization rate (%) of manganese oxide, determining C as the purity (%) of the manganese oxide, and determining m as the mass percent content (%) of manganese in the manganese oxide.

Further, in the manganese content balancing period, the manganese oxide feeding amount per hour is less than or equal to I/b; wherein, I is a series current (kA), and b is a constant satisfying: b is 5 kA/kg.

Further, in the manganese content balance period in the electrolytic process, the adding time of the manganese oxide is as follows: the starting point of the daily addition of the oxides of manganese is after the aluminium is tapped from the aluminium electrolysis cell.

Further, the oxide of manganese is MnO, MnO₂，Mn₂O₃，Mn₃O₄Any one or a combination of several.

Further, the aluminum electrolytic cell is a prebaked anode aluminum electrolytic cell.

The utilization rate of the manganese oxide raw material refers to the percentage of the total amount of manganese in the produced aluminum-manganese alloy to the total amount of manganese in the manganese oxide raw material added into the electrolytic bath.

The invention has the advantages that: the method has the main advantages that no redundant by-product is generated, the raw material loss is low, the production cost is greatly reduced, the aluminum electrolysis cell can be continuously produced, and the product productivity is high; the magnetic field of the aluminum electrolytic cell provides stirring power for the full dispersion of manganese in aluminum, and the produced aluminum-manganese alloy has uniform components and high product quality; the invention avoids the problems of large fluctuation of technological conditions, abnormal operation and the like caused by intense aluminothermic reduction reaction between the manganese oxide and aluminum by strictly controlling the feeding amount and the feeding mode of the manganese oxide, maintains the technological conditions of the aluminum electrolytic cell in a reasonable range, ensures the stable operation of the aluminum electrolytic cell in the process of preparing the aluminum-manganese alloy by electrolysis, and has the characteristic of short production flow when the aluminum-manganese alloy is prepared by a direct electrolysis method.

The invention only utilizes the existing prebaked anode aluminum electrolytic cell, can accurately control the manganese content in the aluminum-manganese alloy under the condition of not increasing any equipment investment, has high utilization rate of manganese raw materials, and has the characteristics of high content, small segregation and uniform components of the obtained aluminum-manganese alloy.

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1: a preparation method of an aluminum-manganese alloy with 1 percent of manganese by mass is characterized in that an aluminum electrolytic cell is used for preparation, the electrolytic cell used in the embodiment is a prebaked anode aluminum electrolytic cell, the adopted anode is a carbon anode, the cathode is a graphite cathode, the electrolytic cell is a cradle type electrolytic cell, and the series current of the electrolytic cell is 600 kA; the manganese oxide in this example was MnO and the purity was 96%. The main technical conditions of the electrolytic cell are as follows: the average voltage was 3.897V, and the electrolysis temperature was 934 ℃.

The preparation method specifically comprises the following steps:

step 1: measuring nNaF AlF in the electrolyte of an aluminum electrolysis cell in a producing aluminum electrolysis cell₃(n is a constant of 2.1 to 2.9); KF; CaF₂；MgF₂；LiF；AL₂O₃Wherein KF is 0.3 percent; CaF₂3.2 percent; MgF₂4.1 percent; LiF is 3%; AL₂O₃Is 6 percent; the balance of cryolite nNaF. AlF₃N is 2.33, and the mass percentage of each component is 100 percent;

step 2: the electrolytic process of this embodiment comprises an aluminum manganese alloy electrolysis cycle, wherein an aluminum manganese alloy electrolysis cycle comprises: a manganese content rising period and a manganese content balancing period; wherein the manganese content rising period is an electrolysis process before the mass percentage of manganese in the aluminum stored in the aluminum electrolysis cell reaches 1%, and the mass percentage of manganese in the stored aluminum in the period continuously rises; the manganese content balancing period is an electrolysis process after the mass percentage of manganese in the aluminum stored in the aluminum electrolysis cell reaches 1%, and the mass percentage of manganese in the stored aluminum is kept unchanged at the stage.

2.1 in the manganese content rising period and the balancing period, the manganese oxide feeding amount per hour is less than or equal to I/b; wherein, I is a series current (kA), and b is a constant satisfying: b is 5 kA/kg; in the embodiment, the calculated addition amount of the manganese oxide per hour is less than or equal to 120 kg;

2.2 in the manganese content rising period in the electrolytic process, adding manganese oxide, detecting and analyzing that the manganese content in the aluminum in the current electrolytic cell memory amount is 0, the target content is 1%, and determining that the daily manganese content rising rate is 0.1%/day. The method comprises the following specific steps:

2.2.1 manganese content rise period, manganese oxide feeding operation on day 1

2.2.1.1 calculation of the 1 st daily feed rate of oxides of manganese in the manganese content Up phase

wherein, W_{Lifting of wine}The daily charge (kg), Q, of oxides of manganese in the manganese content rise phase_DishFor electrolyzing aluminumMass of aluminum in the cell (kg), a₁Is the actual detection value (%) of the mass percent content of manganese in the aluminum in the internal memory of the aluminum electrolytic cell on the day a₂The mass percentage (%) of manganese in the aluminum which is expected to be reached in the amount of the aluminum stored in the aluminum electrolytic cell on the next day (a)₂-a₁) The daily rise rate (%) of the manganese content, Q_{Product produced by birth}The content of the aluminum in the aluminum electrolytic cell is the sunrise aluminum amount (kg), P is the raw material utilization rate (%) of the manganese oxide, C is the purity (%) of the manganese oxide, and m is the mass percent content (%) of the manganese in the manganese oxide.

In the day 1 calculation of the present embodiment, Q_Dish40500 kg; a is₁The value is 0 through spectral analysis; due to a₂-a₁When the ratio is 0.1%, a is determined₂0.1 percent; q_{Product produced by birth}4410 kg; day 1P was set to 100%; c is 96 percent; m is 77.45% calculated by MnO molecular formula; w is calculated by the formula (1)_{Lifting of wine}60.40 kg.

2.2.1.2 according to the step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 120 kg; in the embodiment, the feeding amount of the manganese oxide on the 1 st day is 60.40kg, and the feeding operation can be completed within 1 hour;

2.2.1.3 when the measured value meets the requirement of the step 1, adding manganese oxide into the prebaked anode aluminum reduction cell according to the calculation results of the steps 2.2.1.1 and 2.2.1.2, wherein the starting time point of the daily addition of the manganese oxide is after the aluminum is discharged from the aluminum reduction cell.

After the feeding is finished on the 1 st day, the mass percent of manganese in the aluminum cell is actually 0.0915% through the spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 1 st day is determined to be 91.5%.

2.2.2 manganese content rise period, manganese oxide feeding operation on day 2

2.2.2.1 calculate the feed rate of the 2 nd day of the manganese oxide during the manganese content rise period

in the day 2 calculation of the present embodiment, Q_Dish40500 kg; a is₁0.0915% by spectroscopic analysis; due to a₂-a₁When the ratio is 0.1%, a is determined₂0.1915%; q_{Product produced by birth}4410 kg; the actual value of the utilization rate of the raw materials of the manganese oxide adopted in the 1 st day P on the 2 nd day is 91.5 percent; c is 96 percent; m is 77.45% calculated by MnO molecular formula; w is calculated by the formula (1)_{Lifting of wine}It was 71.94 kg.

2.2.2.2 according to the step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 120 kg; the feeding amount of the manganese oxide on the 2 nd day in the embodiment is 71.94kg, and the feeding operation can be completed within 1 hour;

2.2.2.3 when the measured value meets the requirement of step 1, adding manganese oxide into the prebaked anode aluminum reduction cell according to the calculation results of step 2.2.2.1 and 2.2.2.2, wherein the starting time point of the daily addition of manganese oxide is after aluminum discharge from the aluminum reduction cell.

After the feeding is finished on the 2 nd day, the mass percent of manganese in the aluminum cell is actually 0.1913% through the spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 2 nd day is determined to be 91.3%.

2.2.3 manganese content rise period, manganese oxide feeding operation on day 3

2.2.3.1 calculation of the 3 rd day charge of oxides of manganese during the manganese ramp-up

in the day 3 calculation of the present embodiment, Q_Dish40500 kg; a is₁0.1913% by spectroscopic analysis; due to a₂-a₁When the ratio is 0.1%, a is determined₂0.2913%; q_{Product produced by birth}4410 kg; the average value of the actual values of the raw material utilization rates of the manganese oxides on day 1 and day 2 on day 3P was 91.4%; c is 96 percent; m passing through MnO moleculesFormula, calculated as 77.45%; w is calculated by the formula (1)_{Lifting of wine}78.50 kg.

2.2.3.2 according to step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 120 kg; the feeding amount of the manganese oxide on the 3 rd day in this example was 78.50kg, and the feeding operation could be completed within 1 hour;

2.2.3.3 when the measured value meets the requirement of the step 1, adding the oxide of manganese into the prebaked anode aluminum reduction cell according to the calculation results of the steps 2.2.3.1 and 2.2.3.2, wherein the starting time point of the daily addition of the oxide of manganese is after the aluminum of the aluminum reduction cell is discharged.

After the feeding is finished on the 3 rd day, the mass percent of manganese in the aluminum cell is actually 0.2916% through the spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 3 rd day is determined to be 91.6%.

And then calculating and feeding materials according to a third day method every day, wherein the specific process is not repeated until the mass percentage content of manganese in the aluminum in the memory amount of the aluminum electrolytic cell reaches 1 percent. In this example, the average value of the actual values of the raw material utilization rates of manganese oxides in the manganese content rise period in the electrolytic process was 91.4%.

2.3 when the mass percent of manganese in the aluminum cell reaches 1 percent, starting to feed according to the manganese content in a balance period. During the balancing period of manganese content in the electrolytic process, manganese oxide is added, and the method specifically comprises the following steps:

2.3.1 calculate the daily charge of oxides of manganese with a balance of manganese content

wherein, W_{Flat plate}The daily charge (kg), Q, of oxides of manganese in equilibrium periods of manganese content_{Product produced by birth}The sunrise aluminum amount (kg) of the aluminum electrolytic cell, a_{Flat plate}The mass percentage content (%) of manganese in the aluminum in the internal storage amount of the aluminum electrolytic cell in the manganese content equilibrium period, P is the raw material utilization ratio (%) of the manganese oxide,c is the purity (%) of the manganese oxide, and m is the manganese content (%) in the manganese oxide by mass%.

In this embodiment, Q_{Product produced by birth}4410 kg; a is_{Flat plate}Is 1%; in the rising period of the content of the manganese, the average value of the actual values of the raw material utilization rate of the manganese oxide is 91.4 percent; c is 96 percent; m is 77.45% calculated by MnO molecular formula; w is calculated by the formula (2)_{Flat plate}64.89 kg.

2.3.2 according to the step 2.1, in the manganese content balancing period, the manganese oxide feeding amount per hour is less than or equal to 120 kg; in the embodiment, the feeding amount of the manganese oxide per day in the equilibrium period is 64.89kg, and the feeding operation can be completed within 1 hour;

2.3.3 when the measured value meets the requirement of the step 1, adding the oxide of manganese into the prebaked anode aluminum reduction cell according to the calculation results of the steps 2.3.1 and 2.3.2, wherein the starting time point of the daily addition of the oxide of manganese is after the aluminum is discharged from the aluminum reduction cell.

By using the aluminum-manganese alloy prepared by electrolysis in the embodiment, 4410kg of aluminum-manganese alloy can be produced in a single electrolytic cell every day, wherein the mass percentage of manganese in the aluminum-manganese alloy is 1%; the mass percentage content deviation of manganese is less than 0.01 percent, and the components are uniform; the average value of the actual values of the raw material utilization rate of the manganese oxide reaches 91.4 percent, and the raw material utilization rate is high; the current efficiency of the aluminum cell is 91.2 percent; in the production process of the aluminum-manganese alloy, the technical conditions of the main electrolysis process are basically kept unchanged, and the production process is stable and continuous.

Example 2: a preparation method of an aluminum-manganese alloy with 1 percent of manganese by mass is characterized in that an aluminum electrolytic cell is used for preparation, the electrolytic cell used in the embodiment is a prebaked anode aluminum electrolytic cell, the adopted anode is a carbon anode, the cathode is a graphite cathode, the electrolytic cell is a cradle type electrolytic cell, and the series current of the electrolytic cell is 600 kA; the manganese oxide in this example was MnO and the purity was 96%. The main technical conditions of the electrolytic cell are as follows: the average voltage was 3.897V, and the electrolysis temperature was 934 ℃.

The preparation method specifically comprises the following steps:

step 1: measuring nNaF in the electrolyte of an aluminium electrolysis cell in a producing aluminium electrolysis cell·AlF₃(n is a constant of 2.1 to 2.9); KF; CaF₂；MgF₂；LiF；AL₂O₃Wherein KF is 0.5 percent; CaF₂6.2 percent; MgF is 3.1%; LiF is 2.1%; AL₂O₃3.8 percent; the balance of cryolite nNaF. AlF₃N is 2.56, and the mass percentage of the components is 100 percent;

the other preparation steps were the same as in example 1.

By using the aluminum-manganese alloy prepared by electrolysis in the embodiment, 4410kg of aluminum-manganese alloy can be produced in a single electrolytic cell every day, wherein the mass percentage of manganese in the aluminum-manganese alloy is 1%; the mass percentage content deviation of manganese is less than 0.01 percent, and the components are uniform; the average value of the actual values of the raw material utilization rate of the manganese oxide reaches 91.4 percent, and the raw material utilization rate is high; the current efficiency of the aluminum cell is 91.3 percent; in the production process of the aluminum-manganese alloy, the technical conditions of the main electrolysis process are basically kept unchanged, and the production process is stable and continuous.

Example 3: a preparation method of an aluminum-manganese alloy with 1 percent of manganese by mass is characterized in that an aluminum electrolytic cell is used for preparation, the electrolytic cell used in the embodiment is a prebaked anode aluminum electrolytic cell, the adopted anode is a carbon anode, the cathode is a graphite cathode, the electrolytic cell is a cradle type electrolytic cell, and the series current of the electrolytic cell is 600 kA; the manganese oxide was MnO and the purity was 96%. The main technical conditions of the electrolytic cell are as follows: the average voltage was 3.637V, and the electrolysis temperature was 921 ℃.

The preparation method is the same as that of example 1.

By using the aluminum-manganese alloy prepared by electrolysis in the embodiment, 4410kg of aluminum-manganese alloy can be produced in a single electrolytic cell every day, wherein the mass percentage of manganese in the aluminum-manganese alloy is 1%; the mass percentage content deviation of manganese is less than 0.01 percent, and the components are uniform; the average value of the actual values of the raw material utilization rate of the manganese oxide reaches 91.5 percent, and the raw material utilization rate is high; the current efficiency of the aluminum cell is 91.2 percent; in the production process of the aluminum-manganese alloy, the technical conditions of the main electrolysis process are basically kept unchanged, and the production process is stable and continuous.

Example 4: aluminum manganese with 3 mass percent of manganeseThe preparation method of the alloy is carried out by using an aluminum electrolytic cell, the electrolytic cell used in the embodiment is a prebaked anode aluminum electrolytic cell, the adopted anode is a carbon anode, the cathode is a semi-graphite cathode, the cell type of the electrolytic cell is a rectangular cell, the series current of the electrolytic cell is 500kA, and the oxide of manganese in the embodiment is MnO₂The purity is 71.2%; the technical conditions of the electrolysis process are as follows: the average voltage was 3.923V, and the electrolysis temperature was 936 ℃.

The preparation method specifically comprises the following steps:

step 1: measuring nNaF AlF in the electrolyte of an aluminum electrolysis cell in a producing aluminum electrolysis cell₃(n is a constant of 2.1 to 2.9); KF; CaF₂；MgF₂；LiF；AL₂O₃Wherein KF is 5.8 percent; CaF₂2.2 percent; MgF₂2.8 percent; LiF 4.1%, AL₂O₃2.5 percent; the balance of cryolite nNaF. AlF₃N is 2.76, and the mass percentage of each component is 100 percent;

step 2: the electrolytic process of this embodiment comprises an aluminum manganese alloy electrolysis cycle, wherein an aluminum manganese alloy electrolysis cycle comprises: a manganese content rising period and a manganese content balancing period; wherein the manganese content rising period is an electrolysis process before the mass percentage of manganese in the aluminum stored in the aluminum electrolysis cell reaches 3%, and the mass percentage of manganese in the stored aluminum in the period continuously rises; the manganese content balancing period is an electrolysis process after the mass percentage of manganese in the aluminum stored in the aluminum electrolysis cell reaches 3%, and the mass percentage of manganese in the stored aluminum is kept unchanged at the stage.

2.1 in the manganese content rising period and the balancing period, the manganese oxide feeding amount per hour is less than or equal to I/b; wherein, I is a series current (kA), and b is a constant satisfying: b is 5 kA/kg; in the embodiment, the charging amount of the manganese oxide in unit hour is calculated to be less than or equal to 100 kg;

2.2 in the manganese content rising period in the electrolytic process, adding manganese oxide, detecting and analyzing that the manganese content in the aluminum in the current electrolytic cell memory is 0, the target content is 3%, and determining that the daily manganese content rising rate is 0.2%/day. The method comprises the following specific steps:

2.2.1 manganese content rise period, manganese oxide feeding operation on day 1

wherein, W_{Lifting of wine}The daily charge (kg), Q, of oxides of manganese in the manganese content rise phase_DishThe mass (kg) of aluminum stored in the aluminum cell, a₁Is the actual detection value (%) of the mass percent content of manganese in the aluminum in the internal memory of the aluminum electrolytic cell on the day a₂The mass percentage (%) of manganese in the aluminum which is expected to be reached in the amount of the aluminum stored in the aluminum electrolytic cell on the next day (a)₂-a₁) The daily rise rate (%) of the manganese content, Q_{Product produced by birth}The content of the aluminum in the aluminum electrolytic cell is the sunrise aluminum amount (kg), P is the raw material utilization rate (%) of the manganese oxide, C is the purity (%) of the manganese oxide, and m is the mass percent content (%) of the manganese in the manganese oxide.

In the day 1 calculation of the present embodiment, Q_Dish36500 kg; a is₁The value is 0 through spectral analysis; due to a₂-a₁When the ratio is 0.2%, a is determined₂0.2 percent; q_{Product produced by birth}3670 kg; day 1P was set to 100%; c is 71.2%; m is passed through MnO₂Molecular formula, calculated as 63.19%; w is calculated by the formula (1)_{Lifting of wine}178.57 kg.

2.2.1.2 according to the step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 100 kg; in the embodiment, the feeding amount of the manganese oxide on the 1 st day is 178.57kg, and the feeding operation needs 2 hours to be completed;

After the feeding is finished on the 1 st day, the mass percent of manganese in the aluminum cell is actually 0.1824% through the spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 1 st day is determined to be 91.2%.

2.2.2 manganese content rise period, manganese oxide feeding operation on day 2

in the day 2 calculation of the present embodiment, Q_Dish36500 kg; a is₁The content of the active carbon is 0.1824 percent by spectral analysis; due to a₂-a₁When the ratio is 0.2%, a is determined₂0.3824%; q_{Product produced by birth}3670 kg; the actual value of the utilization rate of the raw materials of the manganese oxide adopted at the 1 st day P at the 2 nd day is 91.2 percent; c is 71.2%; m is passed through MnO₂Molecular formula, calculated as 63.19%; w is calculated by the formula (1)_{Lifting of wine}212.11 kg.

2.2.2.2 according to the step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 100 kg; in the embodiment, the feeding amount of the manganese oxide on the 2 nd day is 212.11kg, and the feeding operation needs 3 hours to be completed;

After the feeding is finished on the 2 nd day, the mass percent of manganese in the aluminum cell is actually 0.3826% through the spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 2 nd day is determined to be 91.3%.

2.2.3 manganese content rise period, manganese oxide feeding operation on day 3

in the day 3 calculation of the present embodiment, Q_Dish36500 kg; a is₁0.3826% by spectroscopic analysis; due to a₂-a₁When the ratio is 0.2%, a is determined₂0.5826%; q_{Product produced by birth}3670 kg; the average value of the actual values of the raw material utilization rates of the manganese oxides on day 1 and day 2 on day 3P was 91.25%; c is 71.2%; m is passed through MnO₂Molecular formula, calculated as 63.19%; w is calculated by the formula (1)_{Lifting of wine}229.89 kg.

2.2.3.2 according to step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 100 kg; in the embodiment, the feeding amount of the manganese oxide on the 3 rd day is 229.89kg, and the feeding operation needs 3 hours to be completed;

After the feeding is finished on the 3 rd day, the mass percent of manganese in the aluminum cell is actually 0.5832% through the spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 3 rd day is determined to be 91.5%.

And then calculating and feeding materials according to a third day method every day, wherein the specific process is not repeated until the mass percentage content of manganese in the aluminum in the memory of the aluminum electrolytic cell reaches 3 percent. In this example, the average value of the actual values of the raw material utilization rates of manganese oxides in the manganese content rise period in the electrolytic process was 91.4%.

2.3 when the mass percent of manganese in the aluminum cell reaches 3 percent, starting to feed according to the manganese content balance period. During the balancing period of manganese content in the electrolytic process, manganese oxide is added, and the method specifically comprises the following steps:

In this embodiment, Q_{Product produced by birth}3670 kg; a is_{Flat plate}Is 3 percent; in the rising period of the content of the manganese, the average value of the actual values of the raw material utilization rate of the manganese oxide is 91.4 percent; c is 71.2%; m is passed through MnO₂Molecular formula, calculated as 63.19%; w is calculated by the formula (2)_{Flat plate}267.74 kg.

2.3.2 according to the step 2.1, in the manganese content balancing period, the manganese oxide feeding amount per hour is less than or equal to 100 kg; in the embodiment, the feeding amount of the manganese oxide per day in the equilibrium period is 267.74kg, and the feeding operation needs 3 hours to be completed;

By using the aluminum-manganese alloy prepared by electrolysis in the embodiment, 3670kg of aluminum-manganese alloy can be produced in a single electrolytic cell every day, and the mass percentage of manganese in the aluminum-manganese alloy is 3%; the mass percentage content deviation of manganese is less than 0.03 percent, and the components are uniform; the average value of the actual values of the raw material utilization rate of the manganese oxide reaches 91.3 percent, and the raw material utilization rate is high; the current efficiency of the aluminum cell is 91.2 percent; in the production process of the aluminum-manganese alloy, the technical conditions of the main electrolysis process are basically kept unchanged, and the production process is stable and continuous.

Example 5: a preparation method of an aluminum-manganese alloy with 3 mass percent of manganese is prepared by using an aluminum electrolytic cell, the aluminum electrolytic cell used in the embodiment is a prebaked anode aluminum electrolytic cell, the adopted anode is a carbon anode, the cathode is a semi-graphite cathode, the shape of the electrolytic cell is a rectangular cell, the series current of the electrolytic cell is 500kA, and the oxide of manganese in the embodiment is MnO₂The purity is 71.2%; the technical conditions of the electrolysis process are as follows: the average voltage was 3.923V, and the electrolysis temperature was 936 ℃.

The preparation method specifically comprises the following steps:

wherein, in the aluminum electrolysis cell being produced, nNaF. AlF in the electrolyte of the aluminum electrolysis cell is measured₃(n is a constant of 2.1 to 2.9); KF; CaF₂；MgF₂；LiF；AL₂O₃Wherein KF is 0.5 percent; CaF₂2.7 percent; MgF₂3.2 percent; LiF is 3.3%; AL₂O₃2.9 percent; the balance of cryolite nNaF. AlF₃N is 2.38, and the mass percentage of each component is 100 percent;

the other preparation steps were the same as in example 4.

By using the aluminum-manganese alloy prepared by electrolysis in the embodiment, 3670kg of aluminum-manganese alloy can be produced in a single electrolytic cell every day, and the mass percentage of manganese in the aluminum-manganese alloy is 3%; the mass percentage content deviation of manganese is less than 0.03 percent, and the components are uniform; the average value of the actual values of the raw material utilization rate of the manganese oxide reaches 91.3 percent, and the raw material utilization rate is high; the current efficiency of the aluminum cell is 91.3 percent; in the production process of the aluminum-manganese alloy, the technical conditions of the main electrolysis process are basically kept unchanged, and the production process is stable and continuous.

Example 6: a preparation method of an aluminum-manganese alloy with 3 mass percent of manganese is prepared by using an aluminum electrolytic cell, the aluminum electrolytic cell used in the embodiment is a prebaked anode aluminum electrolytic cell, the adopted anode is a carbon anode, the cathode is a semi-graphite cathode, the shape of the electrolytic cell is a rectangular cell, the series current of the electrolytic cell is 500kA, and the oxide of manganese in the embodiment is MnO₂The purity is 71.2%; the technical conditions of the electrolysis process are as follows: the average voltage is 3.756VThe electrolysis temperature was 918 ℃.

The preparation method is the same as in example 4.

By using the aluminum-manganese alloy prepared by electrolysis in the embodiment, 3670kg of aluminum-manganese alloy can be produced in a single electrolytic cell every day, and the mass percentage of manganese in the aluminum-manganese alloy is 1%; the mass percentage content deviation of manganese is less than 0.01 percent, and the components are uniform; the average value of the actual values of the raw material utilization rate of the manganese oxide reaches 91.4 percent, and the raw material utilization rate is high; the current efficiency of the aluminum cell is 91.4 percent; in the production process of the aluminum-manganese alloy, the technical conditions of the main electrolysis process are basically kept unchanged, and the production process is stable and continuous.

Example 7: a method for preparing an aluminum-manganese alloy with 6 mass percent of manganese uses an aluminum electrolytic cell for preparation, the electrolytic cell used in the embodiment is a prebaked anode aluminum electrolytic cell, the adopted anode is a carbon anode, the cathode is a graphite cathode, the electrolytic cell is a cradle type electrolytic cell, the series current of the electrolytic cell is 320kA, the manganese oxide in the embodiment is Mn₂O₃The purity is 98%; the technical conditions of the electrolytic cell are as follows: the average voltage was 3.785V and the electrolysis temperature was 945 ℃.

The preparation method specifically comprises the following steps:

step 1: measuring nNaF AlF in the electrolyte of an aluminum electrolysis cell in a producing aluminum electrolysis cell₃(n is a constant of 2.1 to 2.9); KF; CaF₂；MgF₂；LiF；AL₂O₃Wherein KF is 1.1 percent; CaF₂1.8 percent; MgF₂2.2 percent; LiF is 3.3%; AL₂O₃2.6 percent; the balance of cryolite nNaF. AlF₃N is 2.82, and the mass percentage of each component is 100 percent;

step 2: the electrolytic process of this example comprises two aluminum manganese alloy electrolysis cycles, wherein one aluminum manganese alloy electrolysis cycle comprises: a manganese content rising period and a manganese content balancing period; in the first aluminum-manganese alloy electrolysis period, the manganese content rising period is the electrolysis process before the mass percentage of manganese in the aluminum stock in the aluminum electrolysis cell reaches 3%, and the manganese content of the aluminum in the aluminum electrolysis cell continuously rises; the manganese content balance period is an electrolysis process after the mass percentage of manganese in the aluminum stock in the aluminum electrolysis cell reaches 3%, and the manganese content of the aluminum in the aluminum stock in the aluminum electrolysis cell is kept unchanged; in the first aluminum-manganese alloy electrolysis cycle, the duration of the manganese content equilibrium period is 10 electrolysis working days; in the second aluminum-manganese alloy electrolysis period, the manganese content rising period is an electrolysis process in which the mass percentage of manganese in the aluminum stock in the aluminum electrolysis cell is from 3% to 6%, and the manganese content of the aluminum in the aluminum electrolysis cell continuously rises; the manganese content balance period is an electrolysis process after the mass percentage of manganese in the aluminum stock in the aluminum electrolysis cell reaches 6%, and the manganese content of the aluminum in the aluminum stock in the aluminum electrolysis cell is kept unchanged;

2.1 in the manganese content rising period and the balancing period, the manganese oxide feeding amount per hour is less than or equal to I/b; wherein, I is a series current (kA), and b is a constant satisfying: b is 5 kA/kg; in the embodiment, the calculated addition amount of the manganese oxide in unit hour is less than or equal to 64 kg;

2.2 in the first manganese content rising period in the electrolysis process, adding manganese oxide in the electrolysis process of which the mass percentage content of manganese in the aluminum stored in the aluminum electrolysis cell is from 0 to 3 percent, detecting and analyzing that the manganese content in the aluminum stored in the current electrolysis cell is 0 and the target content is 3 percent, and determining the daily rise rate of the manganese content to be 0.3 percent/day. The method comprises the following specific steps:

2.2.1 manganese content rise period, manganese oxide feeding operation on day 1

wherein, W_{Lifting of wine}The daily charge (kg), Q, of oxides of manganese in the manganese content rise phase_DishThe mass (kg) of aluminum stored in the aluminum cell, a₁Is the actual detection value (%) of the mass percent content of manganese in the aluminum in the internal memory of the aluminum electrolytic cell on the day a₂The aluminum in the aluminum cell is stored for the next dayThe expected mass percent (%) of manganese to be achieved, (a)₂-a₁) The daily rise rate (%) of the manganese content, Q_{Product produced by birth}The content of the aluminum in the aluminum electrolytic cell is the sunrise aluminum amount (kg), P is the raw material utilization rate (%) of the manganese oxide, C is the purity (%) of the manganese oxide, and m is the mass percent content (%) of the manganese in the manganese oxide.

In the day 1 calculation of the present embodiment, Q_Dish16500 kg; a is₁The value is 0 through spectral analysis; due to a₂-a₁0.3%, determine a₂0.3 percent; q_{Product produced by birth}2350 kg; day 1P was set to 100%; c is 98%; m is represented by Mn₂O₃Molecular formula, calculated as 69.6%; w is calculated by the formula (1)_{Lifting of wine}82.91 kg.

2.2.1.2 according to the step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 64 kg; in the embodiment, the feeding amount of the manganese oxide on the 1 st day is 82.91kg, and the feeding operation needs 2 hours to be completed;

After the feeding is finished on the 1 st day, the mass percent of manganese in the aluminum cell is actually 0.2724% through the spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 1 st day is determined to be 90.8%.

2.2.2 manganese content rise period, manganese oxide feeding operation on day 2

in the day 2 calculation of the present embodiment, Q_Dish16500 kg; a is₁The content of the product is 0.2724% by spectral analysis detection(ii) a Due to a₂-a₁0.3%, determine a₂0.5724%; q_{Product produced by birth}2350 kg; the actual value of the utilization rate of the raw materials of the manganese oxide adopted in the 1 st day P on the 2 nd day is 90.8 percent; c is 98%; m is represented by Mn₂O₃Molecular formula, calculated as 69.6%; w is calculated by the formula (1)_{Lifting of wine}101.64 kg.

2.2.2.2 according to the step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 64 kg; in the embodiment, the feeding amount of the manganese oxide on the 2 nd day is 101.64kg, and the feeding operation needs 2 hours to be completed;

After the feeding is finished on the 2 nd day, the mass percent of manganese in the aluminum cell is actually 0.5720% through the spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 2 nd day is determined to be 90.7%.

2.2.3 manganese content rise period, manganese oxide feeding operation on day 3

in the day 3 calculation of the present embodiment, Q_Dish16500 kg; a is₁0.5720% by spectroscopic analysis; due to a₂-a₁0.3%, determine a₂0.8720%; q_{Product produced by birth}2350 kg; the average value of the actual values of the raw material utilization rates of the manganese oxides on the 1 st and 2 nd days is 90.75% on the 3 rd day P; c is 98%; m is represented by Mn₂O₃Molecular formula, calculated as 69.6%; w is calculated by the formula (1)_{Lifting of wine}113.07 kg.

2.2.3.2 according to step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 64 kg; in the embodiment, the feeding amount of the manganese oxide on the 3 rd day is 113.07kg, and the feeding operation needs 2 hours to be completed;

After the feeding is finished on the 3 rd day, the mass percent of manganese in the aluminum cell is actually 0.8726% through the spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 3 rd day is determined to be 90.9%.

And then calculating and feeding materials according to a third day method every day, wherein the specific process is not repeated until the mass percentage content of manganese in the aluminum in the memory of the aluminum electrolytic cell reaches 3 percent. In this example, the average value of the actual values of the raw material utilization rates of manganese oxides in the manganese content rise period in the electrolytic process was 90.9%.

2.3 when the mass percent of manganese in the aluminum cell reaches 3 percent, starting to feed according to the manganese content balance period. During the first manganese content balancing period in the electrolysis process, manganese oxide is added, and the method specifically comprises the following steps:

In this embodiment, Q_{Product produced by birth}2350 kg; a is_{Flat plate}Is 3 percent; in the rising period of the content of the manganese, the average value of the actual values of the raw material utilization rate of the manganese oxide is 90.8 percent; c is 98%; m is represented by Mn₂O₃Molecular formula, calculated as 69.6%; w is calculated by the formula (2)_{Flat plate}113.83 kg.

2.3.2 according to the step 2.1, in the manganese content balancing period, the manganese oxide feeding amount per hour is less than or equal to 64 kg; in the embodiment, the feeding amount of the manganese oxide per day in the equilibrium period is 113.83kg, and the feeding operation needs 2 hours to be completed;

2.3.3 when the measured value meets the requirement of the step 1, adding the oxide of manganese into the prebaked anode aluminum reduction cell according to the calculation results of the steps 2.3.1 and 2.3.2, wherein the starting time point of the daily addition of the oxide of manganese is after the aluminum is discharged from the aluminum reduction cell. The duration of the first manganese content equilibration period was 10 electrolysis days, followed by the start of the second aluminum manganese alloy electrolysis cycle.

In this example, the average value of the actual values of the raw material utilization rates of the manganese oxides in the first manganese content rising period and the equilibrium period in the electrolytic process was 90.8%.

2.4 in the second manganese content rising period in the electrolysis process, adding manganese oxide in the electrolysis process that the mass percentage content of manganese in the aluminum stored in the aluminum electrolysis cell is from 3% to 6%, detecting and analyzing that the manganese content in the aluminum stored in the current electrolysis cell is 3% and the target content is 6%, and determining that the daily manganese content rising rate is 0.1%/day. The method comprises the following specific steps:

2.4.1 manganese content rise period, manganese oxide feeding operation on day 1

2.4.1.1 calculation of the 1 st daily feed rate of oxides of manganese in the manganese content Up phase

In the day 1 calculation of the present embodiment, Q_Dish16500 kg; a is₁The content of the product is 3% by spectral analysis; due to a₂-a₁When the ratio is 0.1%, a is determined₂3.1 percent; q_{Product produced by birth}2350 kg; p adopts a first manganese content rising period and a balancing period in the electrolysis process, and the average value of the actual values of the raw material utilization rate of the manganese oxide is 90.8 percent; c is 98%; m is represented by Mn₂O₃Molecular formula, calculated as 69.6%; w is calculated by the formula (1)_{Lifting of wine}144.27 kg.

2.4.1.2 according to step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 64 kg; in the embodiment, the feeding amount of the manganese oxide on the 1 st day is 144.27kg, and the feeding operation needs 3 hours to be completed;

2.4.1.3 when the measured value meets the requirement of step 1, adding manganese oxide into the prebaked anode aluminum reduction cell according to the calculation results of step 2.4.1.1 and 2.4.1.2, wherein the starting time point of the daily addition of the manganese oxide is after the aluminum is discharged from the aluminum reduction cell.

After the feeding is finished on the 1 st day, the mass percent of manganese in the aluminum in the memory amount of the aluminum electrolytic cell is actually 3.1% through spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 1 st day is determined to be 90.8%.

And then calculating and feeding materials according to the method of the day 1 every day, wherein the specific process is not repeated until the mass percentage content of manganese in the aluminum in the memory of the aluminum electrolytic cell reaches 6 percent. In this example, the average value of the actual values of the raw material utilization rates of the manganese oxides in the first manganese content rising period and the equilibrium period and the second manganese content rising period in the electrolytic process was 90.8%.

2.5 when the mass percent of manganese in the aluminum cell reaches 6 percent, starting to feed according to the manganese content balance period. During the first manganese content balancing period in the electrolysis process, manganese oxide is added, and the method specifically comprises the following steps:

2.5.1 calculate the daily charge of oxides of manganese during the equilibrium period of manganese content

In this embodiment, Q_{Product produced by birth}2350 kg; a is_{Flat plate}Is 6 percent; the average value of the actual values of the raw material utilization rate of the manganese oxide is found to be stable to 90.8% through earlier production practice, so that P is set to 90.8%; c is 98%; m is represented by Mn₂O₃Molecular formula, calculated as 69.6%; w is calculated by the formula (2)_{Flat plate}227.67 kg.

2.5.2 according to the step 2.1, in the manganese content balancing period, the manganese oxide feeding amount per hour is less than or equal to 64 kg; in the embodiment, the feeding amount of the manganese oxide per day in the equilibrium period is 227.67kg, and the feeding operation needs 4 hours to be completed;

2.5.3 when the measured value meets the requirement of the step 1, adding the oxide of manganese into the prebaked anode aluminum reduction cell according to the calculation results of the steps 2.5.1 and 2.5.2, wherein the starting time point of the daily addition of the oxide of manganese is after the aluminum is discharged from the aluminum reduction cell.

By using the aluminum-manganese alloy prepared by electrolysis in the embodiment, 2350kg of aluminum-manganese alloy can be produced in a single electrolytic cell every day, and the mass percentage of manganese in the aluminum-manganese alloy is 6%; the mass percentage content deviation of manganese is less than 0.05 percent, and the components are uniform; the average value of the actual values of the utilization rate of the raw materials of the manganese oxide reaches 90.8 percent, and the utilization rate of the raw materials is high; the current efficiency of the aluminum cell is 91.2 percent; in the production process of the aluminum-manganese alloy, the technical conditions of the main electrolysis process are basically kept unchanged, and the production process is stable and continuous.

Example 8: a method for preparing an aluminum-manganese alloy with 6 mass percent of manganese uses an aluminum electrolytic cell for preparation, the electrolytic cell used in the embodiment is a prebaked anode aluminum electrolytic cell, the adopted anode is a carbon anode, the cathode is a graphite cathode, the electrolytic cell is a cradle type electrolytic cell, the series current of the electrolytic cell is 320kA, the manganese oxide in the embodiment is Mn₂O₃The purity is 98%; the technical conditions of the electrolytic cell are as follows: the average voltage was 3.785V and the electrolysis temperature was 945 ℃.

The preparation method specifically comprises the following steps:

step 1: measuring nNaF AlF in the electrolyte of an aluminum electrolysis cell in a producing aluminum electrolysis cell₃(n is a constant of 2.1 to 2.9); KF; CaF₂；MgF₂；LiF；AL₂O₃Wherein KF is 0.9 percent; CaF₂2.1 percent; MgF₂1.9 percent; LiF is 5.9%; AL₂O₃2.7 percent; the balance of cryolite nNaF. AlF₃N is 2.58, and the mass percentage of the components is 100 percent;

the other preparation steps were the same as in example 7.

By using the aluminum-manganese alloy prepared by electrolysis in the embodiment, 2350kg of aluminum-manganese alloy can be produced in a single electrolytic cell every day, and the mass percentage of manganese in the aluminum-manganese alloy is 6%; the mass percentage content deviation of manganese is less than 0.05 percent, and the components are uniform; the average value of the actual values of the utilization rate of the raw materials of the manganese oxide reaches 90.8 percent, and the utilization rate of the raw materials is high; the current efficiency of the aluminum cell is 91.1 percent; in the production process of the aluminum-manganese alloy, the technical conditions of the main electrolysis process are basically kept unchanged, and the production process is stable and continuous.

Example 9: a method for preparing an aluminum-manganese alloy with 6 mass percent of manganese uses an aluminum electrolytic cell for preparation, the electrolytic cell used in the embodiment is a prebaked anode aluminum electrolytic cell, the adopted anode is a carbon anode, the cathode is a graphite cathode, the electrolytic cell is a cradle type electrolytic cell, the series current of the electrolytic cell is 320KA, and the manganese oxide in the embodiment is Mn₂O₃The purity is 98%; the technical conditions of the electrolytic cell are as follows: the average voltage was 3.663V, and the electrolysis temperature was 940 ℃.

The other preparation steps were the same as in example 7.

Example 10: a method for preparing an aluminum-manganese alloy with the manganese content of 10 percent by mass uses an aluminum electrolytic cell for preparation, the electrolytic cell used in the embodiment is a prebaked anode aluminum electrolytic cell, the adopted anode is a carbon anode, the cathode is a graphite cathode, the electrolytic cell is a cradle type cell, the series current of the electrolytic cell is 200KA, and the manganese oxide in the embodiment is Mn₂O₃The purity is 98%; the technical conditions of the electrolytic cell are as follows: the average voltage was 3.625V and the electrolysis temperature was 915 ℃.

The preparation method specifically comprises the following steps:

step 1: measuring nNaF AlF in the electrolyte of an aluminum electrolysis cell in a producing aluminum electrolysis cell₃(n is a constant of 2.1 to 2.9); KF; CaF₂；MgF₂；LiF；AL₂O₃Wherein KF is 0.8 percent; CaF₂6.8 percent; MgF₂4.2 percent; LiF is 2.3%; AL₂O₃4.6 percent; the balance of cryolite nNaF. AlF₃N is 2.29, and the mass percentage of each component is 100 percent;

step 2: the electrolytic process of this example comprises three aluminum manganese alloy electrolysis cycles, wherein one aluminum manganese alloy electrolysis cycle comprises: a manganese content rising period and a manganese content balancing period; in the first aluminum-manganese alloy electrolysis period, the manganese content rising period is the electrolysis process before the mass percentage of manganese in the aluminum stock in the aluminum electrolysis cell reaches 3%, and the manganese content of the aluminum in the aluminum electrolysis cell continuously rises; the manganese content balance period is an electrolysis process after the mass percentage of manganese in the aluminum stock in the aluminum electrolysis cell reaches 3%, and the manganese content of the aluminum in the aluminum stock in the aluminum electrolysis cell is kept unchanged; in the first aluminum-manganese alloy electrolysis cycle, the duration of the manganese content equilibrium period is 10 electrolysis working days; in the second aluminum-manganese alloy electrolysis period, the manganese content rising period is an electrolysis process in which the mass percentage of manganese in the aluminum stock in the aluminum electrolysis cell is from 3% to 6%, and the manganese content of the aluminum in the aluminum electrolysis cell continuously rises; the manganese content balance period is an electrolysis process after the mass percentage of manganese in the aluminum stock in the aluminum electrolysis cell reaches 6%, and the manganese content of the aluminum in the aluminum stock in the aluminum electrolysis cell is kept unchanged; in the second aluminum-manganese alloy electrolysis cycle, the duration of the manganese content equilibrium period is 10 electrolysis working days; in the third aluminum-manganese alloy electrolysis period, the manganese content rising period is an electrolysis process in which the mass percentage of manganese in the aluminum stock in the aluminum electrolysis cell is from 6% to 10%, and the manganese content of the aluminum in the aluminum electrolysis cell continuously rises; the manganese content balance period is an electrolysis process after the mass percentage of manganese in the aluminum stock in the aluminum electrolysis cell reaches 10%, and the manganese content of the aluminum in the aluminum stock in the aluminum electrolysis cell is kept unchanged;

2.1 in the manganese content rising period and the balancing period, the manganese oxide feeding amount per hour is less than or equal to I/b; wherein, I is a series current (kA), and b is a constant satisfying: b is 5 kA/kg; in the embodiment, the calculated addition amount of the manganese oxide in unit hour is less than or equal to 40 kg;

2.2 in the first manganese content rising period in the electrolysis process, adding manganese oxide in the electrolysis process of which the mass percentage content of manganese in the aluminum stored in the aluminum electrolysis cell is from 0 to 3 percent, detecting and analyzing that the manganese content in the aluminum stored in the current electrolysis cell is 0 and the target content is 3 percent, and determining the daily rise rate of the manganese content to be 0.5 percent/day. The method comprises the following specific steps:

2.2.1 manganese content rise period, manganese oxide feeding operation on day 1

In the day 1 calculation of the present embodiment, Q_Dish10850 kg; a is₁The value is 0 through spectral analysis; due to a₂-a₁When the ratio is 0.5%, a is determined₂0.5 percent; q_{Product produced by birth}1460 kg; day 1P was set to 100%; c is 98%; m is represented by Mn₂O₃Molecular formula, calculated as 69.6%; w is calculated by the formula (1)_{Lifting of wine}It was 90.24 kg.

2.2.1.2 according to the step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 40 kg; in the embodiment, the feeding amount of the manganese oxide on the 1 st day is 90.24kg, and the feeding operation needs 3 hours to be completed;

After the feeding is finished on the 1 st day, the mass percent of manganese in the aluminum cell is actually 0.4515% through the spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 1 st day is determined to be 90.3%.

2.2.2 manganese content rise period, manganese oxide feeding operation on day 2

in the day 2 calculation of the present embodiment, Q_Dish16500 kg; a is₁0.4515% by spectroscopic analysis; due to a₂-a₁When the ratio is 0.5%, a is determined₂0.9515%; q_{Product produced by birth}1460 kg; the actual value of the utilization rate of the raw materials of the manganese oxide adopted in the 1 st day P on the 2 nd day is 90.3 percent; c is 98%; m is represented by Mn₂O₃Molecular formula, calculated as 69.6%; w is calculated by the formula (1)_{Lifting of wine}110.63 kg.

2.2.2.2 according to the step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 40 kg; in the embodiment, the feeding amount of the manganese oxide on the 2 nd day is 110.63kg, and the feeding operation needs 3 hours to be completed;

After the feeding is finished on the 2 nd day, the mass percent of manganese in the aluminum cell is actually 0.9509% through the spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 2 nd day is determined to be 90.2%.

2.2.3 manganese content rise period, manganese oxide feeding operation on day 3

in the day 3 calculation of the present embodiment, Q_Dish10850 kg; a is₁0.9509% by spectroscopic analysis; due to a₂-a₁When the ratio is 0.5%, a is determined₂1.4509%; q_{Product produced by birth}1460 kg; the average value of the actual values of the raw material utilization rates of the manganese oxides on the 1 st and 2 nd days is 90.25% on the 3 rd day P; c is 98%; m is represented by Mn₂O₃Molecular formula, calculated as 69.6%; w is calculated by the formula (1)_{Lifting of wine}122.54 kg.

2.2.3.2 according to step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 40 kg; in the embodiment, the feeding amount of the manganese oxide on the 3 rd day is 122.54kg, and the feeding operation needs 4 hours to be completed;

After the feeding is finished on the 3 rd day, the mass percent of manganese in the aluminum cell is actually 1.4512% through spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 3 rd day is determined to be 90.3%.

And then calculating and feeding materials according to a third day method every day, wherein the specific process is not repeated until the mass percentage content of manganese in the aluminum in the memory of the aluminum electrolytic cell reaches 3 percent. In this example, the average value of the actual values of the raw material utilization rates of manganese oxides in the manganese content rise period in the electrolytic process was 90.3%.

In this embodiment, Q_{Product produced by birth}1460 kg; a is_{Flat plate}Is 3 percent; in the rising period of the content of the manganese, the average value of the actual values of the raw material utilization rate of the manganese oxide is 90.3 percent; c is 98%; m is represented by Mn₂O₃Molecular formula, calculated as 69.6%; w is calculated by the formula (2)_{Flat plate}113.83 kg.

2.3.2 according to the step 2.1, in the manganese content balancing period, the manganese oxide feeding amount per hour is less than or equal to 40 kg; in the embodiment, the feeding amount of the manganese oxide is 71.11kg per day in the equilibrium period, and the feeding operation needs 2 hours to be completed;

In this example, the average value of the actual values of the raw material utilization rates of the manganese oxides in the first manganese content rising period and the equilibrium period in the electrolytic process was 90.3%.

2.4 in the second manganese content rising period in the electrolysis process, adding manganese oxide in the electrolysis process that the mass percentage content of manganese in the aluminum stored in the aluminum electrolysis cell is from 3% to 6%, detecting and analyzing that the manganese content in the aluminum stored in the current electrolysis cell is 3% and the target content is 6%, and determining that the daily manganese content rising rate is 0.3%/day. The method comprises the following specific steps:

2.4.1 manganese content rise period, manganese oxide feeding operation on day 1

In the day 1 calculation of the present embodiment, Q_Dish10850 kg; a is₁The content of the product is 3% by spectral analysis; due to a₂-a₁0.3%, determine a₂3.3 percent; q_{Product produced by birth}1460 kg; p adopts a first manganese content rising period and a balancing period in the electrolysis process, and the average value of the actual values of the raw material utilization rate of the manganese oxide is 90.3 percent; c is 98%; m is represented by Mn₂O₃Molecular formula, calculated as 69.6%; w is calculated by the formula (1)_{Lifting of wine}131.07 kg.

2.4.1.2 according to step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 40 kg; in the embodiment, the feeding amount of the manganese oxide on the 1 st day is 144.27kg, and the feeding operation needs 4 hours to be completed;

After the feeding is finished on the 1 st day, the mass percent of manganese in the aluminum in the memory amount of the aluminum electrolytic cell is actually 3.3% through spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 1 st day is determined to be 90.3%.

And then calculating and feeding materials according to the method of the day 1 every day, wherein the specific process is not repeated until the mass percentage content of manganese in the aluminum in the memory of the aluminum electrolytic cell reaches 6 percent. In this example, the average value of the actual values of the raw material utilization rates of the manganese oxides in the first manganese content rising period and the equilibrium period and the second manganese content rising period in the electrolytic process was 90.3%.

In bookIn the examples, Q_{Product produced by birth}1460 kg; a is_{Flat plate}Is 6 percent; the average value of the actual values of the raw material utilization rate of the manganese oxide is found to be stable to 90.3% through earlier production practice, so that P is set to 90.3%; c is 98%; m is represented by Mn₂O₃Molecular formula, calculated as 69.6%; w is calculated by the formula (2)_{Flat plate}142.23 kg.

2.5.2 according to the step 2.1, in the manganese content balancing period, the manganese oxide feeding amount per hour is less than or equal to 40 kg; in the embodiment, the feeding amount of the manganese oxide per day in the equilibrium period is 227.67kg, and the feeding operation needs 4 hours to be completed;

2.5.3 when the measured value meets the requirement of the step 1, adding the oxide of manganese into the prebaked anode aluminum reduction cell according to the calculation results of the steps 2.5.1 and 2.5.2, wherein the starting time point of the daily addition of the oxide of manganese is after the aluminum is discharged from the aluminum reduction cell. The duration of the second manganese content equilibration period was 10 electrolysis days, followed by the start of the third aluminum manganese alloy electrolysis cycle.

In this example, the average value of the actual values of the raw material utilization rates of the manganese oxides in the first and second manganese content rising periods and the equilibrium period in the electrolysis process was 90.3%.

2.6 in the third manganese content rising period in the electrolysis process, adding manganese oxide in the electrolysis process that the mass percentage content of manganese in the aluminum stored in the aluminum electrolysis cell is from 6% to 10%, detecting and analyzing that the manganese content in the aluminum stored in the current electrolysis cell is 6%, the target content is 10%, and determining that the daily manganese content rising rate is 0.15%/day. The method comprises the following specific steps:

2.6.1 manganese content rise period, manganese oxide feeding operation on day 1

2.6.1.1 calculation of the 1 st daily feed rate of manganese oxide during the manganese content ramp-up

wherein, W_{Lifting of wine}Of manganese during manganese content riseDaily charge (kg) of oxides, Q_DishThe mass (kg) of aluminum stored in the aluminum cell, a₁Is the actual detection value (%) of the mass percent content of manganese in the aluminum in the internal memory of the aluminum electrolytic cell on the day a₂The mass percentage (%) of manganese in the aluminum which is expected to be reached in the amount of the aluminum stored in the aluminum electrolytic cell on the next day (a)₂-a₁) The daily rise rate (%) of the manganese content, Q_{Product produced by birth}The content of the aluminum in the aluminum electrolytic cell is the sunrise aluminum amount (kg), P is the raw material utilization rate (%) of the manganese oxide, C is the purity (%) of the manganese oxide, and m is the mass percent content (%) of the manganese in the manganese oxide.

In the day 1 calculation of the present embodiment, Q_Dish10850 kg; a is₁The content of the active ingredient is 6% by spectral analysis; due to a₂-a₁0.15%, determine a₂6.15 percent; q_{Product produced by birth}1460 kg; the average value of the actual values of the raw material utilization rate of the manganese oxide is found to be stable to 90.3% through earlier production practice, so that P is set to 90.3%; c is 98%; m is represented by Mn₂O₃Molecular formula, calculated as 69.6%; w is calculated by the formula (1)_{Lifting of wine}131.07 kg.

2.6.1.2 according to the step 2.1, in the manganese content rising period, the manganese oxide feeding amount per hour is less than or equal to 40 kg; in the embodiment, the feeding amount of the manganese oxide on the 1 st day is 131.07kg, and the feeding operation needs 4 hours to be completed;

2.6.1.3 when the measured value meets the requirement of step 1, adding manganese oxide into the prebaked anode aluminum reduction cell according to the calculation results of step 2.6.1.1 and 2.6.1.2, wherein the starting time point of the daily addition of manganese oxide is after aluminum discharge from the aluminum reduction cell.

After the feeding is finished on the 1 st day, the mass percent of manganese in the aluminum cell is actually 6.15% through the spectral analysis and detection, and the actual value of the utilization rate of the raw material of the manganese oxide on the 1 st day is determined to be 90.3%.

And then calculating and feeding materials according to the method of the day 1 every day, wherein the specific process is not repeated until the mass percentage content of manganese in the aluminum in the memory of the aluminum electrolytic cell reaches 10%. In this example, the average value of the actual values of the raw material utilization rates of the manganese oxides in the first and second manganese content rising periods and the equilibrium period and the third manganese content rising period in the electrolytic process was 90.3%.

2.7 when the mass percent of manganese in the aluminum cell reaches 10 percent, starting to feed according to the manganese content in a balance period. During the first manganese content balancing period in the electrolysis process, manganese oxide is added, and the method specifically comprises the following steps:

2.7.1 calculate the daily charge of oxides of manganese with a balance of manganese content

In this embodiment, Q_{Product produced by birth}1460 kg; a is_{Flat plate}10 percent; the average value of the actual values of the raw material utilization rate of the manganese oxide is found to be stable to 90.3% through earlier production practice, so that P is set to 90.3%; c is 98%; m is represented by Mn₂O₃Molecular formula, calculated as 69.6%; w is calculated by the formula (2)_{Flat plate}237.04 kg.

2.7.2 according to the step 2.1, in the manganese content balancing period, the manganese oxide feeding amount per hour is less than or equal to 40 kg; in the embodiment, the feeding amount of the manganese oxide per day in the equilibrium period is 227.67kg, and the feeding operation needs 6 hours to be completed;

2.7.3 when the measured value meets the requirement of step 1, adding manganese oxide into the prebaked anode aluminum reduction cell according to the calculation results of step 2.7.1 and 2.7.2, wherein the starting time point of the daily addition of the manganese oxide is after the aluminum discharge of the aluminum reduction cell.

By using the aluminum-manganese alloy prepared by electrolysis in the embodiment, 1460kg of aluminum-manganese alloy can be produced in a single electrolytic cell every day, and the mass percentage of manganese in the aluminum-manganese alloy is 10%; the mass percentage content deviation of manganese is less than 0.08 percent, and the components are uniform; the average value of the actual values of the raw material utilization rate of the manganese oxide reaches 90.3 percent, and the raw material utilization rate is high; the current efficiency of the aluminum cell is 91.1 percent; in the production process of the aluminum-manganese alloy, the technical conditions of the main electrolysis process are basically kept unchanged, and the production process is stable and continuous.

Example 11: a preparation method of aluminum-manganese alloy with 10 percent of manganese by mass is characterized in that an aluminum electrolytic cell is used for preparation, the electrolytic cell used in the embodiment is a prebaked anode aluminum electrolytic cell, the adopted anode is a carbon anode, the cathode is a graphite cathode, the electrolytic cell is a cradle type electrolytic cell, and the series current of the electrolytic cell is 200 kA; the oxide of manganese in this example is Mn₂O₃The purity was 98%. The main technical conditions of the electrolytic cell are as follows: the average voltage was 3.625V and the electrolysis temperature was 915 ℃.

The preparation method specifically comprises the following steps:

step 1: measuring nNaF AlF in the electrolyte of an aluminum electrolysis cell in a producing aluminum electrolysis cell₃(n is a constant of 2.1 to 2.9); KF; CaF₂；MgF₂；LiF；AL₂O₃Wherein KF is 0.5 percent; CaF₂1.2 percent; MgF is 6.1%; LiF is 5.7%; AL₂O₃2.8 percent; the balance of cryolite nNaF. AlF₃N is 2.78, and the mass percentage of each component is 100 percent;

the other preparation steps were the same as in example 10.

By using the aluminum-manganese alloy prepared by electrolysis in the embodiment, 1460kg of aluminum-manganese alloy can be produced in a single electrolytic cell every day, and the mass percentage of manganese in the aluminum-manganese alloy is 10%; the mass percentage content deviation of manganese is less than 0.08 percent, and the components are uniform; the average value of the actual values of the raw material utilization rate of the manganese oxide reaches 90.3 percent, and the raw material utilization rate is high; the current efficiency of the aluminum cell is 90.9 percent; in the production process of the aluminum-manganese alloy, the technical conditions of the main electrolysis process are basically kept unchanged, and the production process is stable and continuous.

Example 12: a preparation method of aluminum-manganese alloy with 10 percent of manganese by mass is characterized in that an aluminum electrolytic cell is used for preparation, the electrolytic cell used in the embodiment is a prebaked anode aluminum electrolytic cell, the adopted anode is a carbon anode, the cathode is a graphite cathode, the electrolytic cell is a cradle type electrolytic cell, and the series current of the electrolytic cell is 200 kA; the oxide of manganese being Mn₂O₃The purity was 98%. The main technical conditions of the electrolytic cell are as follows: the average voltage was 3.563V, and the electrolysis temperature was 941 ℃.

The preparation method is the same as that of example 10.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The preparation method of the aluminum-manganese alloy is characterized by being prepared by an aluminum electrolytic cell and comprising the following steps: (1) measuring nNaF AlF in the electrolyte of an aluminum electrolysis cell in a producing aluminum electrolysis cell₃N is a constant of 2.1 to 2.9; KF; CaF₂；MgF₂；LiF；Al₂O₃Wherein the nNaF. AlF₃62 to 94 percent; KF is 0.1-8%; CaF₂1-8%; MgF₂1-8%; LiF accounts for 1-8%; al (Al)₂O₃2-7%, and the mass percentage of the components is 100%; (2) when the measured value is within the above range, the oxide of manganese is added, and the electricity is detected and maintainedSolving the technical conditions: the electrolysis temperature is 900-960 ℃, and the average voltage is 3.5-4.3V, so as to obtain the aluminum-manganese alloy;

adding manganese oxide into the aluminum electrolytic cell according to the step (2), wherein the electrolytic process comprises at least one aluminum-manganese alloy electrolytic cycle, and the aluminum-manganese alloy electrolytic cycle comprises the following steps: a manganese content rising period and a manganese content balancing period; wherein the manganese content rising period is an electrolysis process before the mass percentage of manganese in the aluminum stored in the aluminum electrolysis cell reaches a set value, and the mass percentage of manganese in the stored aluminum continuously rises at the stage; the manganese content balancing period is an electrolysis process after the mass percentage of manganese in the aluminum stored in the aluminum electrolysis cell reaches a set value, and the mass percentage of manganese in the stored aluminum is kept unchanged at the stage;

during the manganese content rising period in the electrolytic process, manganese oxide is added, and the method specifically comprises the following steps:

wherein, W_{Lifting of wine}The daily feeding amount of the manganese oxide in the manganese content rising period is kg; q_DishThe mass of the aluminum in the aluminum cell is kg; a is₁Is the actual detection value of the mass percent content of manganese in the aluminum cell memory on the day,%; a is₂The mass percentage content,%, which is expected to be reached by manganese in the aluminum in the memory amount of the aluminum electrolytic cell on the next day; a is₂-a₁The daily rise rate,%, of manganese content; q_{Product produced by birth}The sunrise aluminum amount of the aluminum cell is kg; p is the raw material utilization ratio,%, of the manganese oxide; c is the purity,%, of manganese oxide; m is the mass percent content of manganese in the manganese oxide;

when the manganese content of the aluminum stored in the electrolytic cell is less than 3 percent by mass percentage, the daily lifting rate of the manganese content is less than or equal to 0.5 percent/day; when the manganese content of the aluminum in the electrolytic cell is more than or equal to 3% and less than 6%, the daily lifting rate of the manganese content is less than or equal to 0.3%/day, and when the manganese content of the aluminum in the electrolytic cell is more than or equal to 6% and less than 10%, the daily lifting rate of the manganese content is less than or equal to 0.15%/day.

2. The method of claim 1, wherein during the manganese content rise period, the manganese oxide feed amount per hour is not more than I/b; wherein, I is series current, kA; b is a constant satisfying: b =5 kA/kg.

3. The method for preparing an aluminum-manganese alloy according to claim 1, wherein in the manganese content rise period in the electrolysis process, the manganese oxide addition time is as follows:

the starting point of the daily addition of the oxides of manganese is after the aluminium is tapped from the aluminium electrolysis cell.

4. The method for preparing the aluminum-manganese alloy according to claim 1, wherein the manganese content of aluminum in the aluminum cell is controlled to be constant during the manganese content balance period, and the method comprises the following specific steps:

wherein, W_{Flat plate}The daily feeding amount of the manganese oxide with the manganese content in the equilibrium period is kg; q_{Product produced by birth}The sunrise aluminum amount of the aluminum cell is kg; a is_{Flat plate}The mass percentage content of manganese in the aluminum cell in the manganese content balance period is percent; p is the raw material utilization ratio,%, of the manganese oxide; c is the purity,%, of manganese oxide; m is the mass percent content of manganese in the manganese oxide.

5. The method of claim 4, wherein during the equilibrium period of manganese content, the manganese oxide feed per hour is less than or equal to I/b; wherein, I is series current, kA; b is a constant satisfying: b =5 kA/kg.

6. The method for preparing the aluminum-manganese alloy according to claim 4, wherein in the balancing period of the manganese content in the electrolysis process, the adding time of the manganese oxide is as follows:

7. The method of any one of claims 1 to 6, wherein the manganese oxide is MnO, MnO₂，Mn₂O₃，Mn₃O₄Any one or a combination of several.

8. The method as claimed in any one of claims 1 to 6, wherein the aluminum electrolytic cell is a pre-baked anode aluminum electrolytic cell.