TWI480381B - Separation of scum in the metal and oxide and zinc metal in the device and its separation method - Google Patents

Description

Device for separating metal intercalation and oxide and zinc metal in scum and separation method thereof

The present invention relates to an apparatus and method for separating a metal intervening material, and more particularly to an apparatus and method for separating metal intercalates and oxides and zinc metal in scum.

The scum produced by the hot dip galvanizing process can be roughly divided into two types according to the different materials contained therein: one is mainly oxide and the other is a metal intermetallic compound (metal intervening). the Lord. But no matter which type of scum, the zinc metal content is quite considerable.

U.S. Patent No. 2,134,605 discloses the application of scum to a rotating iron drum, the heating of the iron drum to melt the scum, and the use of rotation to promote separation of the zinc metal liquid from the scum. U.S. Patent No. 3,198,505 discloses the application of scum to a permeable substrate which is then heated to allow the molten metal to flow out. The method disclosed in U.S. Patent No. 4,057,232, which is not heated, utilizes a porous spoon to fill the scum, and the scum is pressed from the platen above the porous spoon to allow the zinc metal to flow out through the pores of the porous spoon. The method disclosed in U.S. Patent No. 4,003,559 also uses an extrusion scum method in which a scum is extruded by an electric fan blade-like rotary squeegee to allow zinc metal liquid in the scum to flow out. However, the above-mentioned conventional zinc metal recovery methods are not efficient, and are only suitable for recovering oxide-based scum, and the separation effect of the scum mainly composed of the metal-containing compound is not good, so the zinc metal liquid is recovered. There is always the problem of high impurity levels.

Regarding the recovery of the scum containing the metal-containing compound, U.S. Patent No. 4,075,008 discloses the use of a medium to deteriorate the fluidity of the scum, and the scum is heated at 680 ° C or lower to maintain the shape and strength of the scum itself. The zinc metal liquid flows out from the scum, but the recovery rate is not high (less than 50%). The purity of the recovered zinc metal liquid can only reach the Fe concentration of 0.02%, and the Fe concentration increases with the increase of the heating temperature. At 566 ° C, the Fe concentration has reached 0.06%, which cannot meet the required level of the raw material zinc ingot. The method disclosed in U.S. Patent No. 4,269,398 is similar to U.S. Patent No. 4,075,008, the results of which are also quite similar, and the recovery and purity of the zinc metal liquid are not high. In addition, there is also a method of collecting zinc vapor by distillation to recondense, but the disadvantage is that the process is too complicated.

Therefore, it is necessary to provide an innovative and progressive device for separating metal intercalation and oxide and zinc metal in scum and a separation method thereof to solve the above problems.

The invention provides a device for separating metal intercalates and oxides and zinc metal in scum, the scum having a proportion of zinc metal content, the scum heating and melting, the metal interdiction, oxide and melting in the original scum The upper part of the zinc metal liquid forms a metal intervening-oxide-zinc metal liquid mixed layer, and the separating device comprises: a receiving unit and a disturbance unit. The accommodating unit heats and melts the scum and accommodates the zinc metal liquid and the metal intervening material-oxide-zinc metal liquid mixed layer. The disturbance unit is configured to place a depth of the metal on the surface of the material-oxide-zinc metal mixed layer to disturb the metal-intermediate-oxide-zinc metal mixed layer at a set disturbance speed.

The invention further provides a method for separating metal intercalation and oxide and zinc metal in scum, the scum having a proportion of zinc metal content, the method comprising the steps of: (a) heating and melting the scum, the scum After heating and melting, the metal intervening material, the oxide and the molten zinc metal liquid partially form a metal intervening oxide-zinc metal liquid mixed layer; (b) the metal intervening-oxide-zinc metal liquid mixing a set depth of the layer surface, disturbing the metal-intermediate-oxide-zinc metal liquid mixed layer at a set disturbance speed; (c) standing the zinc metal liquid and the metal intervening-oxide-zinc metal liquid mixed layer And (d) removing the metal intervening material and the oxide.

The apparatus and method for separating metal intercalation and oxide and zinc metal in the scum of the present invention utilizes a rotating or vibrating manner to disturb the metal-intermediate-oxide-zinc metal liquid mixed layer after the heating and melting of the scum, thereby greatly increasing The separation effect of the metal intervening material and the oxide and the zinc metal liquid is improved, wherein the recovery rate of the zinc metal liquid can be increased to 82%, and the Fe content in the zinc metal liquid can be reduced to 0.003%. Therefore, the apparatus and method for separating metal intercalation and oxide and zinc metal in the scum of the present invention can effectively recover a very pure zinc metal liquid.

In the production process of hot dip galvanized (Zn) wire (for example, continuous hot dip galvanizing line), the impurity Fe in the zinc bath reacts with Al to form a relatively small specific intermetallic compound (metal intervening), which will Floating on the surface of the zinc tank to form scum. The scum still contains more than 90% of Zn after being removed, so it is necessary to separate the metal intervening material from the zinc metal liquid and recover the cleaned zinc metal liquid. However, the scum is often mixed with an oxide film formed by a large amount of oxides, which hinders the metal from floating on the material, resulting in poor separation of the metal intervening material and the zinc metal liquid.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the apparatus for separating metal intercalates and oxides and zinc metal in the scum according to the present invention. The scum has a proportion of zinc metal content, and after the scum is heated and melted, a metal intervening substance is formed on the metal medium (for example, Fe ₂ Al ₅ ), the oxide, and the molten zinc metal liquid 11 . - Zinc metal liquid mixed layer 10. Here, the particle portion in Fig. 1 is a case where the metal intervening substance and the oxide are mixed in the metal intervening-oxide-zinc metal liquid mixed layer 10.

The apparatus 2 for separating metal intercalation and oxide and zinc metal in the scum includes a receiving unit 21, a disturbance unit 22, a controller 23 and a slag blocking member 24. The accommodating unit 21 heats and melts the dross, and accommodates the zinc metal liquid 11 and the metal intervening material-oxide-zinc metal liquid mixed layer 10. In this embodiment, the accommodating unit 21 includes a heater 211 and a spout 212. The heater 211 is preferably disposed around the accommodating unit 21 for heating and melting the scum. The nozzle 212 is located around the top edge of the accommodating unit 21, and the treated zinc metal liquid 11 is discharged from the pouring nozzle 212 into a mold in a subsequent casting process to form a raw material zinc ingot.

The disturbance unit 22 is configured to place the metal on the surface of the material-oxide-zinc metal mixed layer 10 at a set depth h to disturb the metal-intermediate-oxide-zinc metal mixed layer 10 at a set disturbance speed. Referring to FIG. 1 and FIG. 2, the disturbance unit 22 includes a base portion 221 and at least one rod portion 222. In the present embodiment, the disturbance unit 22 includes a plurality of rod portions 222, and the rod portions 222 are substantially eccentrically The base 221 is connected. The rod portions 222 are used to set the set depth h of the metal under the surface of the material-oxide-zinc metal mixed layer 10. Preferably, the set depth h is greater than the thickness of the metal-intermediate-oxide-zinc metal mixed layer 10. In the present embodiment, the set depth h is the metal-intermediate-oxide-zinc metal solution. The surface of the mixed layer 10 is about one-half the depth below the surface. Wherein, if the disturbance unit 22 is a rotating device (for example, a rotary motor device), the base portion 221 is moved to a relative position of the metal intervening material-oxide-zinc metal liquid mixed layer 10 in each region. And each of the rod portions 222 is rotated about its central axis to rotate the metal intervening material-oxide-zinc metal liquid mixed layer 10. It should be noted that the disturbance unit 22 can also be a vibration device such as an ultrasonic vibrator or a vibration motor.

The controller 23 is connected to the disturbance unit 22 for controlling the set disturbance speed of the disturbance unit 22 and the set depth h of the metal interposed under the surface of the material-oxide-zinc metal mixed layer 10. The slag blocking element 24 is disposed at an opposite position above the spout 212, and the slag blocking member 24 forms a casting passage 25 with the spout 212. Wherein, after disturbing the zinc metal liquid 11 and the metal intervening in the material-oxide-zinc metal liquid mixed layer 10, the metal medium and the oxide are floated after being allowed to stand, thereby reducing the metal intervening-oxide-zinc metal liquid mixture. The thickness of layer 10 is then removed (e.g., by means of the removal) of the metal intervening material and the oxide. After the removal of the metal intervening material and the oxide, the casting channel 25 allows the pure zinc metal liquid 11 to flow out of the receiving unit 21, and the slag blocking member 24 further stops the liquid level of the zinc metal liquid 11. A metal intervening or oxide may not be completely removed to prevent it from flowing into the mold.

Figure 3 is a flow chart showing the method of separating metal intercalates and oxides from zinc metal in the scum according to the present invention. Referring to FIG. 1 to FIG. 3, referring to step S31, first, a receiving unit 21 is provided for heating and melting the dross, and the zinc metal liquid 11 and the metal intervening-oxide-zinc are accommodated. The metal liquid mixed layer 10. Preferably, in step S31, the housing unit 21 heats and melts the dross at 540 ° C to 850 ° C.

Referring to step S32, a slag is added to the molten zinc metal liquid 11 and the metal intervening-oxide-zinc metal liquid mixed layer 10. Among them, since the oxide is formed on the liquid surface of the hot dip galvanizing bath, it is in the form of a film, and will wrap around the metal intervening material and the zinc metal after being taken up, so that the metal intercalation is still difficult to be combined with the zinc metal after the reflow of the dross. The liquid separation is to unwind the entanglement of the metal intercalation and the zinc metal. Therefore, after the scum is melted, a slag removing agent is added to initially separate the oxide, the metal intervening substance and the zinc metal.

Referring to step S33, a disturbance unit 22 is placed in the metal-on-oxide-zinc metal-mixed layer 10 surface to set a depth h, and the metal-intermediate-oxide-zinc metal mixture is disturbed at a set disturbance speed. Layer 10. Preferably, in step S33, the set depth h is about one-half depth below the surface of the metal-oxide-zinc metal mixed layer 10, and the disturbance time is greater than 1 minute.

In this embodiment, the disturbance unit 22 disturbs the metal-intermediate-oxide-zinc metal mixed layer 10 in a rotating disturbance manner in step S33. In other applications, the disturbance unit 22 can also be disturbed by vibration disturbance. The metal is interposed in the material-oxide-zinc metal liquid mixed layer 10. Wherein, the disturbance unit 22 preferably movably disturbs the metal-intermediate-oxide-zinc metal mixed layer 10 of each region.

Among them, although the addition of the slag removing agent and the use of the temperature effect can improve the separation effect of the oxide, the metal intervening substance and the zinc metal liquid, however, since the separation effect is closely related to the viscous coefficient of the slag, the metal layer of the lower layer is above the floating object. In the process, the density of the metal intervening material in the material-oxide-zinc metal mixed layer 10 is also increased, and the viscosity coefficient is also increased. When the density of the metal intervening substance is high to some After the degree, the metal can not float up. At this time, the temperature can be raised, thereby improving the effect of removing the oxide by the slag removing agent and lowering the viscosity coefficient, so that the metal can further float up.

In addition, in order to further improve the separation effect, the present invention further utilizes the rod portions 222 of the disturbance unit 22 to be placed under the surface of the metal-oxide-zinc metal liquid mixed layer 10 to set a depth h to rotate at a high speed. Or the vibration disturbing method disturbs the metal-intermediate-oxide-zinc metal mixed layer 10, and breaks the oxide film formed by a large amount of oxides in the dross, so as to facilitate the smooth floating of the oxide and the metal.

Referring to step S34, the zinc metal liquid 11 after the disturbance is left and the metal is interposed in the material-oxide-zinc metal liquid mixed layer 10. Preferably, the rest time in step S34 is greater than 5 minutes. The difference in specific gravity causes the metal to float on the object to separate from the zinc metal liquid 11. Similarly, when the density of the metal intervening material is high to some extent, the temperature can be raised to enhance the effect of removing the oxide by the descum fluxing agent and lower the viscosity coefficient, and the rod portions 222 of the perturbation unit 22 will be oxidized. The oxide film formed by the object is broken, so that the metal can further float upward.

Referring to step S35, the metal interposer and the oxide are removed. In this embodiment, the metal intervening material and the oxide are removed in a rubbing manner to prevent the underlying pure zinc metal liquid 11 from being contaminated by the metal and oxide which are not removed.

Referring to step S36, a step of slag casting is performed. Preferably, after the metal interposer and the oxide are removed, the casting channel 25 formed by the slag blocking member 24 and the spout 212 allows the pure zinc metal liquid 11 to flow out from the receiving unit 21, and the block The slag element 24 further stops the metal intervening or oxide that may not be completely removed from the surface of the zinc metal liquid 11 to prevent it from flowing into the mold.

The apparatus and method for separating metal intercalation and oxide and zinc metal in the scum according to the present invention utilizes a rotating or vibrating manner to disturb the metal-intermediate-oxide-zinc metal mixed layer 10 after the heating and melting of the scum. The separation effect of the metal intervening substance and the oxide and the zinc metal liquid 11 is greatly improved, wherein the recovery rate of the zinc metal liquid can be increased to 82%, and the Fe content in the zinc metal liquid 11 can be reduced to 0.003%. Therefore, the apparatus and method for separating metal intercalation and oxide and zinc metal in the scum of the present invention can effectively recover a very pure zinc metal liquid.

The above embodiments are merely illustrative of the principles and effects of the invention and are not intended to limit the invention. Therefore, those skilled in the art can make modifications and changes to the above embodiments without departing from the spirit of the invention. The scope of the invention should be as set forth in the appended claims.

2. . . Device for separating metal intercalation and oxide and zinc metal in scum according to the invention

10. . . Metal-intermediate-oxide-zinc metal mixed layer

11. . . Zinc metal liquid

twenty one. . . Storage unit

twenty two. . . Disturbance unit

twenty three. . . Controller

twenty four. . . Slag blocking element

25. . . Casting channel

211. . . Heater

212. . . Spout

221. . . Base

222. . . Rod

Figure 1 is a schematic view showing the apparatus for separating metal intercalates and oxides and zinc metal in the scum according to the present invention;

Figure 2 shows a schematic view of the disturbance unit of the present invention;

Figure 3 is a flow chart showing the method of separating metal intercalates and oxides from zinc metal in the scum according to the present invention.

2. . . Device for separating metal intercalation and oxide and zinc metal in scum according to the invention

10. . . Metal-intermediate-oxide-zinc metal mixed layer

11. . . Zinc metal liquid

twenty one. . . Storage unit

twenty two. . . Disturbance unit

twenty three. . . Controller

twenty four. . . Slag blocking element

25. . . Casting channel

211. . . Heater

212. . . Spout

221. . . Base

222. . . Rod

Claims (19)

The utility model relates to a device for separating a metal intercalation material and an oxide and a zinc metal in a scum, the scum having a proportion of zinc metal content, the scum heating and melting, the metal intervening medium, the oxide and the molten zinc metal liquid upper part Forming a metal intervening-oxide-zinc metal liquid mixed layer, the separating device comprising: a receiving unit, heating and melting the dross and accommodating the zinc metal liquid and the metal intervening material-oxide-zinc metal liquid mixed layer And a disturbing unit, the metal is placed on the surface of the material-oxide-zinc metal mixed layer to set a depth, and the metal interfacial-oxide-zinc metal mixed layer is disturbed at a set disturbance speed, the set depth It is such that the metal is at a depth greater than one-half of the thickness of the mixed layer under the surface of the material-oxide-zinc metal mixed layer. The device of claim 1, wherein the storage unit further comprises a heater for heating and melting the dross. The device of claim 1, wherein the disturbance unit comprises a base portion and at least one rod portion connected to the base portion for placing the metal interposed under the surface of the material-oxide-zinc metal liquid mixed layer This setting depth. The device of claim 3, wherein the stem is substantially eccentrically coupled to the base. The device of claim 4, wherein the disturbance unit is a rotating device, the base is moved to a relative position of the metal intervening material-oxide-zinc metal liquid mixed layer in each region, and each rod portion is wound The central axis rotates to perturb the metal-intermediate-oxide-zinc metal mixed layer by rotation. The device of claim 5, wherein the rotating device is a rotary motor device. The device of claim 1, wherein the disturbance unit is a vibration device. The device of claim 7, wherein the vibrating device is an ultrasonic vibrator or a vibrating motor. The device of claim 1, further comprising a controller coupled to the disturbance unit to control the set disturbance speed and the set depth of the metal interposed under the surface of the metal-oxide-zinc metal mixed layer. The device of claim 1, further comprising a slag blocking member, wherein the receiving unit has a sprue, and the slag blocking member is disposed at an opposite position above the sprue to form a casting passage. A method for separating a metal intercalation material and an oxide and a zinc metal in a scum, the scum having a proportion of zinc metal content, the method comprising the steps of: (a) heating and melting the scum, the scum heating and melting a metal intervening material-oxide-zinc metal liquid mixed layer is formed over the metal, the oxide and the molten zinc metal liquid; (b) the metal intercalation-oxide-zinc metal liquid mixed layer surface is set. Depth, disturbing the metal-intermediate-oxide-zinc metal liquid mixed layer at a set disturbance speed, the set depth being greater than the thickness of the mixed layer by the metal interfacial-oxide-zinc metal mixed layer surface a depth of one; (c) leaving the zinc metal liquid and the metal intervening material-oxide-zinc metal liquid mixed layer; (d) removing the metal intervening material and the oxide. The method of claim 11, wherein the scum is heated and heated at 540 ° C to 850 ° C in the step (a). The method of claim 11, wherein the step of adding a descumifier is further included after the step (a). The method of claim 11, wherein the disturbance time in step (b) is greater than 1 minute. The method of claim 11, wherein in step (b) the metal intervening-oxide-zinc metal mixed layer is disturbed by a rotational perturbation. The method of claim 11, wherein in the step (b), the metal-intermediate-oxide-zinc metal mixed layer is disturbed by vibration perturbation. The method of claim 15 or 16, wherein in step (b), the perturbation unit is movably disturbing the metal-intermediate-oxide-zinc metal mixed layer of each region. The method of claim 11, wherein the resting time in step (c) is greater than 5 minutes. The method of claim 11, wherein the step of casting a slag is further included after the step (d).