• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to the production of aluminum by electrolysis, in particular, to methods for the production of baked anodes. The aim of the invention is to improve the quality of the anodes. The essence of the invention is to obtain anodes with maximum density. To do this, when mixing carbonaceous filler and pitch, the optimum amount of pitch is used. Optimum pitch content allows maximum anode density to be obtained. 4 il.
    公开号:SU1597108A3
    申请号:SU874202796
    申请日:1987-06-23
    公开日:1990-09-30
    发明作者:Ванворен Клод
    申请人:Алюминиюм Пешинэ (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to the production of aluminum by electrolysis, in particular to methods for the manufacture of sintered anodes.
    The aim of the invention is to improve the quality of the anodes.
    The essence of the invention is a method of regulating the manufacture of a raw anode (changing the percentage of pitch), which allows to maximize the density on the heated anode without having to wait for the results of the firing.
    At the level of a given constant quality of petroleum coke, the apparent density of the heated anode essentially depends on the dry density of the raw anode. The latter directly reflects the actual compaction of dry matter in the anode.
    This dry density is related to the apparent density of the raw anode and to the content of the pitch depending
    D5 YES shfa x (100 -% pitch) / 100
    where db is dry raw density
    anode; YES cheese is fine with raw density
    anode (directly measured);
    % pitch - the content of pitch, expressed in weight percent.
    Dp of a given pair of primary substances and for the conditions of manufacture (granulometry, mixing ...) and the formation of a mass, the dry density of the raw anodes obtained passes through an oltim at a certain pitch content. 3 FIG. 1 shows the change in the dry attributed raw anode in dependence on the content of binding at the parameter: applied voltage during molding; Fig. 2 shows the change in the basic parameters of the anodes depending on the bone content of the pitch for a given level of compaction voltage; in FIG. 3, regulation of the fel content according to the proposed method in FIG. 4, the change in the anode density depending on the content of the pitch. The optimum content of the pitch, which the torso allows to obtain the maximum apparent density of the heated anode, is shown. It is noted that it corresponds to the content that allows to obtain the maximum dry density of the free anode, therefore, the proposed method allows to optimize the apparent density of the heated anodes, taking into account only measurements of raw anodes during the course of compaction, after ovatelno, with the possibility of immediate driving system control rm Furthermore, the optimum dry density is relative and T obviously varies with the manufacturing parameters (primary substance granulometry: in B). As a result, with the exception of transition periods, the optimization of dry density leads in all cases to optimize the density of the heated anode. The method is carried out as follows. The mixer of the carburized mass is fed crushed coke with a certain grain size that is maintained and maintained coke feed is also held constant as well as pitch, the percentage of which Vd (%) in relation to coke is adjustable either manually or programmable auto with a mat or microprocessor. At the exit of the mixer, the mass is carburized and injected into the sealing device, and the compacted anodes are produced on the live conveyor. In the case of using an intermittent mixer, the dose of the carburized mass has a constant composition. Therefore, any change in the percentage of pitch is reflected on all N anodes obtained from the dose. In the case of using a continuous mixer, there is a shift between the moment when the content of pitch in the head of the mixer is changed and the moment when it appears. The first sealing anode with a modified composition of the mass. This shift is denoted by d (in practice it can be 3-6 anodes). In this case, the computer is programmed according to this position. Apparent to the density of the raw anode depends on the weight and volume of the anode. Weight is measured with an error of less than 0.1%. Experience shows that the length and width after compaction can be considered constant with a similar refinement for pitch contents with an error not exceeding 1% (absolute values) relative to the average value. Therefore, it is sufficient to measure the height H of the compacted anode to find out its volume. The measured weight, length, and width (they are constant, but they can be corrected if necessary), the measured height, and the percentage of pitch, therefore, have YES dry Anode weight P / {(Hh) x X 1J + V ,, and V {, is the volume of the anode head, Tie, the upper part, which contains the chamfers S, the anode plugs and various possible shells, L is the height of the anode head; the raw anode density is D8 YES cheese x (100% pitch) / 100. These data are entered into a computer. The computing machine also takes into account the initial content of the pitch B ((%), which is fixed according to the manufacturing experience; the anodes made under these conditions have a dry density, which is denoted by r (B). Then the initial content of the pitch B is increased by the value of x (for example, 0.1 or 0.2%, absolute values.) Anodes obtained with the new content of the B + X pitch have a dry density T (Bd + x), which is measured on average by the anodes (for example, preferably 10) for detect small fluctuations. Increments x can be positive or negative m. Compare (B, х x) with (C) (average values), If (BO + x)), increase Bj + X by the value of x with the same sign as the previous value, If y (Bd + x ) y (E), increment Br + X by the value of x, but with a sign opposite to the previous value, and: m, e, and each stage of the method consists in comparing the scientific research institute with the value obtained at the considered stage, received at the previous stage. This algorithm can be accepted by noting that if an increase in B (incrementing positive x) leads to an increase in the dry density of the anodes, this proves that they are below optimum B, if this increase in B leads to a decrease in dry density, then the optimum B exceeded. Similarly, if a decrease in B (a reduction of negative x) leads to a decrease in dry density, this proves that, surely, it is below the optimum content, if a decrease in B leads to an increase in dry density, it should be above optimum. either of the comparisons between (B (+ nx) and I-CB, + (n + 1) x) leads to equality, the following instructions can be written to the operator or machine: - keep the pitch content constant at the level of value B (+ (n +) x go to B + (n + 1), where x is positive or negative, and this The helix can be performed with an increment of x equal to X or less than x (for example, x x / 2) so as not to be too tilted from Optimum B if it is considered to be close to this value ;; ;;: ; - i ,, ,, I Set the maximum limit of change This limit B, + x (Fig. 3) can be set at incremental steps. Each of these steps can, for example, be 0.1 or 0.2% pitch (in absolute% and X can be set, for example ± 0.5 or + 0.6% (absolute values) to avoid too much amplitude of changes around the optimum After a certain amount of time to establish an equilibrium, it is necessary to lay down the initial value In the possession of the pitch and give it a new value equal to or almost equal to the absolute value B, such that it can be calculated from the actual depth of the dry density depending on the content of the pitch (see iGvA ), and the computational machine can determine this value automatically. All these operations can be carried out as follows: manually (in this case, the operator removes the data that the computational Ashina and performs increments in a predetermined direction and within the limits established for general changes X 1x); automatically (the calculated data are entered into a programmable automaton or into a microprocessor with indication and / or with the printing of changes in various parameters). Figure 4 shows an experimental curve describing the whole range from 13.4 to 14.5% for the content of the pitch. Obviously, for each value of the PLL content of the pitch, the measured dry density values are combined on the scatter line with an amplitude of about + 0.002 points from the absolute dry density. LR and meer. On the production line of anodes intended for a series of electrolysis baths, 13.4% of the pitch, x 0.1%, and x + 0.6% were installed. It was noted that the regulator optimizes the pitch content of about 13.6%, corresponding to a maximum density (dry density) of 1.416, i.e. wetness of raw anode that provides a high level of quality of heated anodes Formula of the invention A method of making sintered anodes for aluminum production by electrolysis, including mixing carbonaceous filler and coke pitch when heated, forming the anode by compaction, determining the density of the raw anode by measuring its weight and shrinkage by height and
    firing 31, which differs in that, in order to increase the honest anodes, after determining the density of the raw anode, determine the maximum density of the dry anode by the equation
    D5 YES cheese% pitch D / 100,
    Heated anode density
    d
    51) (interval € Fig. 1
    Each raw anode density
    Arbitrary scale
    where db is the dry anode density; YES raw anode density; % pitch choose from the interval of 13.4
    14.5 wt.%
    and when mixing, take the content of the pitch corresponding to the maximum density of the dry anode
    Ialr / nie
    (6 зыВан} 1 another) lek

    Seeming} 1c heated anode density
    FIG. 2
    权利要求:
    Claims (1)
    [1]
    Claim
    A method of manufacturing calcined anodes for aluminum production by electrolysis, comprising mixing a carbon filler and coking pitch by heating, forming the anode by densification, determining the density of the raw anode by measuring its weight and shrinkage by height and where DB is the density of the dry anode;
    YES is the density of the crude anode;
    % of the pitch is selected from the range of 13.414.5 wt.%, and when mixed, the pitch content corresponding to the maximum density of the dry anode is taken.
    firing the product, characterized in that, in order to improve the quality of the anodes, after determining the density of the crude anode, the maximum density of the dry anode is determined by the equation
    DB = YES crude / - £ 100 -% pitch J / 100,
    Heated Anode Density
    Figure 1
    Characteristic
    The apparent charge of the crude anode
    The apparent density of the heated anode arbitrary scale
    Dry density
    Crush strength
    Specific Resistance Pitch —---- 3 ”” r> 4!
    Order 2919 Circulation 536 Subscription
    VNIIIPI of the State Committee for Inventions and Discoveries under the SCST S (^ CP
    113035, Moscow, Zh-35, Raushskaya nab., D. 4/5
    Production and Publishing Plant Patent, Uzhhorod, st. Gagarina, 101
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FR8609805A|FR2600675B1|1986-06-24|1986-06-24|METHOD FOR ADJUSTING THE PIT CONTENT OF ANODES FOR THE PRODUCTION OF ALUMINUM BY ELECTROLYSIS|
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