CN210481059U - System for handle zinciferous waste liquid - Google Patents
System for handle zinciferous waste liquid Download PDFInfo
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- CN210481059U CN210481059U CN201921089980.1U CN201921089980U CN210481059U CN 210481059 U CN210481059 U CN 210481059U CN 201921089980 U CN201921089980 U CN 201921089980U CN 210481059 U CN210481059 U CN 210481059U
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Abstract
The utility model discloses a system for handle zinciferous waste liquid, this system includes: the neutralization device is provided with a zinc-containing waste liquid inlet, a neutralizer inlet and a mixed slurry outlet; grading plant includes from top to bottom: the top of upflow cylinder, upflow cylinder is open, includes: the mixed slurry inlet pipe extends into the upper flow column body from the top of the upper flow column body; the overflow groove is arranged on the outer side wall of the top of the upstream cylinder; a zinc hydroxide slurry outlet arranged at the bottom of the overflow tank; an underflow column, comprising: the rotary water inlet pipe is arranged in a tangent way with the side wall of the lower part of the underflow cylinder; the discharging direction of the calcium sulfate slurry outlet is tangent to the side wall of the upper part of the underflow cylinder, and the calcium sulfate slurry outlet is positioned at the upper part of the rotary water inlet pipe in the height direction; a transition column connected to the upper flow column and the lower flow column; the sedimentation-filtration unit is provided with a zinc hydroxide slurry inlet, a flocculating agent inlet, a zinc-rich slag outlet and a filtered liquid outlet.
Description
Technical Field
The utility model belongs to carborundum field of handling particularly, the utility model relates to a system for handle zinciferous waste liquid.
Background
The waste acid generated in the existing zinc hydrometallurgy process is mainly treated by a lime neutralization method, and a large amount of neutralized slag is generated. The neutralized slag belongs to hazardous waste, the treatment cost is high, and besides some heavy metals, a large amount of zinc is neutralized and precipitated in the slag, so that the zinc cannot be recycled, and the waste of resources is caused. The literature proposes that the contaminated acid is treated by a two-stage method in a grading way, the pH value of the first stage is lower than that of the metal ion hydrolysis precipitation, and the product is pure gypsum; and the pH value is increased in the second stage to precipitate metal ions. However, the precipitation pH of many metal ions is relatively low, and the metal ions can be precipitated under acidic conditions, such as aluminum, ferric iron, zinc and the like, so that the obtained gypsum has limited purity, and the heavy metal ions are also more in the gypsum. In addition, there are other methods for treating waste acid, such as electric flocculation, biological adsorption, ferrite, etc., but they are not applied in engineering.
The zinc-containing waste liquid is a certain amount of acidic waste water generated in the wet purification washing and demisting processes in zinc smelting, heavy metals in the waste water can be precipitated by sulfides or precipitated by hydroxide neutralization, but most of the existing methods only aim at achieving the waste water discharge standard, and the recovery of valuable metals in the waste water is not considered or the recovery cost is too high.
Therefore, the current technology for treating the zinc-containing waste liquid needs to be further improved.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the utility model discloses an aim at propose the system of a processing zinciferous waste liquid. The system realizes the high-efficiency classification of zinc hydroxide and calcium sulfate with different particle sizes, realizes the recovery of zinc after sedimentation and filtration, can continuously carry out the whole process, has simple flow and is easy to realize industrialization.
In an aspect of the utility model, the utility model provides a system for handle zinciferous waste liquid, according to the utility model discloses an embodiment, this system includes:
a neutralization device having a zinc-containing waste liquid inlet, a neutralizer inlet, and a mixed slurry outlet;
grading plant, the grading plant includes from top to bottom:
an upflow column, the top of which is open, comprising:
the mixed slurry inlet pipe extends into the upstream column body from the top of the upstream column body, and is connected with the mixed slurry outlet;
the overflow groove is arranged on the outer side wall of the top of the upstream column body;
a zinc hydroxide slurry outlet, wherein the zinc hydroxide slurry outlet is arranged at the bottom of the overflow tank;
an underflow column, said underflow column comprising:
the rotary water inlet pipe is arranged in a tangent manner with the side wall of the lower part of the underflow cylinder;
a calcium sulfate slurry outlet, wherein the discharging direction of the calcium sulfate slurry outlet is tangent to the side wall of the upper part of the underflow cylinder, and the calcium sulfate slurry outlet is positioned at the upper part of the rotary water inlet pipe in the height direction;
a transition column connecting the up-flow column and the down-flow column;
the sedimentation-filtration unit is provided with a zinc hydroxide slurry inlet, a flocculant inlet, a zinc-rich slag outlet and a filtered liquid outlet, and the zinc hydroxide slurry inlet is connected with the zinc hydroxide slurry outlet.
According to the utility model discloses system for handle zinciferous waste liquid, acidic zinciferous waste liquid and neutralizer effect back, can obtain the mixed thick liquids that contains zinc hydroxide and calcium sulfate, mix the thick liquids and enter into the underflow cylinder through mixing the thick liquids admission pipe, water gets into the underflow cylinder from rotatory inlet tube simultaneously, because of the tangent setting of the lateral wall of rotatory inlet tube and underflow cylinder lower part, water gets into and upwards forms the vortex rivers along underflow cylinder inner wall tangent line to mix with the mixed thick liquids that lets in. Solid calcium sulfate particles with larger specific gravity or larger particle size in the mixed slurry are deposited downwards and are finally discharged through a calcium sulfate slurry outlet; and the zinc hydroxide particles with smaller specific gravity or smaller particle size move upwards along with the water flow rotating upwards, and finally overflow from the top end of the upflow column body and enter the overflow groove to be discharged through a zinc hydroxide slurry outlet. The obtained zinc hydroxide slurry can be subjected to further flocculation precipitation and filtration to obtain zinc-rich slag, so that zinc can be recovered. Therefore, the system realizes the high-efficiency classification of zinc hydroxide and calcium sulfate with different particle sizes, realizes the recovery of zinc after sedimentation and filtration, can continuously perform the whole process, has simple flow and is easy to realize industrialization.
In addition, the system for treating the zinc-containing waste liquid according to the embodiment of the present invention may further have the following additional technical features:
optionally, the upstream column is formed by connecting multi-section sub-columns through flanges. Thereby, the classification and recovery of the mixed slurry with smaller specific gravity or smaller particle size can be further realized.
Optionally, the ratio of height to diameter of the upflow column is (5-25): 1. therefore, the grading effect of the zinc-containing waste liquid treatment system can be further improved.
Optionally, the distance between the bottom end of the silicon carbide slurry feeding pipe and the top end of the upflow column in the height direction accounts for 75-80% of the height of the upflow column. This can further improve the classification effect of the silicon carbide classifying device.
Optionally, the ratio of the diameter of the upflow column to the underflow column is (1.2-2): 1. therefore, the grading efficiency of the zinc-containing waste liquid treatment system can be further improved.
Optionally, the cross-sectional area of the transition cylinder is gradually reduced from top to bottom, and the included angle between the side wall of the transition cylinder and the vertical direction is 25-35 degrees. Therefore, the grading efficiency of the zinc-containing waste liquid treatment system can be further improved.
Optionally, the upflow column further comprises a mid-stream outlet located on the sidewall of the upflow column and lower in height than the zinc hydroxide slurry outlet. Thus, mixed slurry with another specific gravity or particle size range can be obtained according to needs, and multi-stage classification of the mixed slurry is further realized.
Optionally, a plurality of the intermediate flow outlets are included, and the plurality of intermediate flow outlets are spaced along the height direction of the upflow column. Therefore, the multistage classification of the mixed slurry can be further realized, and the classification efficiency is improved.
Optionally, the projection included angle between the rotary water inlet pipe and the calcium sulfate slurry outlet on the horizontal plane is 0-360 degrees. Thereby, the classification efficiency of the system for treating the zinc-containing waste liquid can be further improved.
Optionally, the upstream column further comprises a water replenishing pipe, the water replenishing pipe extends into the interior of the upstream column and is downward in opening, and the water replenishing pipe is located below the bottom end of the mixed slurry inlet pipe. Therefore, the grading effect of the zinc-containing waste liquid treatment system can be further improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic view of a system for treating a zinc-containing waste liquid according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a grading device according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a classifying device according to still another embodiment of the present invention;
FIG. 4 is a schematic view showing the structure of a system for treating a zinc-containing waste liquid according to still another embodiment of the present invention;
fig. 5 is a schematic structural view of a grading device according to yet another embodiment of the present invention;
FIG. 6 is a top view of a rotary inlet pipe and a calcium sulfate slurry outlet according to an embodiment of the present invention;
fig. 7 is a schematic flow chart of a method for treating waste liquid containing zinc by using the system for treating waste liquid containing zinc according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, in the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In an aspect of the present invention, the utility model provides a system for handle zinciferous waste liquid, according to the embodiment of the present invention, refer to fig. 1-6, this system for handle zinciferous waste liquid includes: a neutralization device 400, a classification device, and a sedimentation-filtration unit 500.
According to the embodiment of the present invention, the neutralization apparatus 400 has a zinc-containing waste liquid inlet 401, a neutralizer inlet 402, and a mixed slurry outlet 403, and is adapted to perform a neutralization reaction of the zinc-containing waste liquid and the neutralizer, so as to obtain a mixed slurry containing zinc hydroxide and calcium sulfate. Specifically, the zinc-containing waste liquid is a certain amount of acidic waste water generated in the wet purification washing and demisting processes in zinc smelting, the zinc content in the zinc-containing waste liquid is 120-180g/L, such as 120g/L, 130g/L, 140g/L, 150g/L, 160g/L, 170g/L and 180g/L, and the pH value of the zinc-containing waste liquid can be 0.5-5.0, such as 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5 and 5.0. The neutralizer can be lime or carbide slag and the like which react with the zinc-containing waste liquid to generate zinc hydroxide and calcium sulfate. The addition amount of the neutralizing agent can be determined according to the zinc content in the zinc-containing waste liquid.
According to an embodiment of the present invention, referring to fig. 1-5, the grading device comprises from top to bottom: an upflow column 100, an underflow column 200, and a transition column 300.
According to an embodiment of the present invention, the top of the upstream column 100 is open, including: a mixed slurry inlet pipe 11, an overflow groove 12 and a zinc hydroxide slurry outlet 13. Specifically, the mixed slurry inlet pipe 11 extends into the upstream column 100 from the top of the upstream column 100 and extends to be close to the bottom of the upstream main body 100, the mixed slurry inlet pipe 11 is connected with the mixed slurry outlet 403, the overflow tank 12 is arranged on the outer side wall of the top of the upstream column 100, the zinc hydroxide slurry outlet 13 is arranged at the bottom of the overflow tank 12 and is suitable for conveying the mixed slurry through the mixed slurry inlet pipe, collecting the zinc hydroxide slurry with smaller specific gravity or particle size overflowing through the overflow tank, and discharging the zinc hydroxide slurry with smaller specific gravity or particle size collected in the overflow tank through the zinc hydroxide slurry outlet. Specifically, the particle size of the zinc hydroxide particles is less than 20.0 microns. It should be noted that, the specific form of the mixed slurry inlet pipe entering the upstream column from the open top of the upstream column is not particularly limited, and those skilled in the art can select the mixed slurry inlet pipe according to actual needs, for example, the mixed slurry inlet pipe may enter from the central axis position of the upstream column, may enter from a position in the upstream column parallel to the central axis of the upstream column, or may enter from a position in the upstream column having a certain included angle with the central axis of the upstream column. Further, the mixed slurry inlet pipe may be extended into the upstream column by externally disposing a fixing bracket. The specific arrangement of the overflow groove is not particularly limited, and the overflow groove may be arranged around a part of the outer side wall of the top of the upflow column, or may be arranged around the entire outer side wall of the top of the upflow column. The specific location, number and size of the zinc hydroxide slurry outlets at the bottom of the overflow launder are also not particularly limited, and one skilled in the art can set the outlet according to actual production needs, such as the smaller specific gravity of the overflow launder or the flow rate of the particulate zinc hydroxide slurry.
According to a specific embodiment of the present invention, in the height direction, the outer sidewall of the overflow groove 12 can be higher than the outer sidewall of the upstream pillar 100, thereby avoiding the zinc hydroxide slurry in the overflow groove from overflowing the overflow groove, resulting in the waste of the zinc hydroxide slurry. It should be noted that the specific value of the outer side wall of the overflow trough and the outer side wall of the upstream column is not particularly limited, and can be selected by those skilled in the art according to the actual needs, for example, the volume of the overflow trough, the overflow amount of the zinc hydroxide slurry, and the flow rate of the zinc hydroxide slurry discharged from the zinc hydroxide slurry outlet.
According to a further embodiment of the present invention, the distance between the bottom end of the mixed slurry inlet pipe 11 and the top end of the upstream column 100 in the height direction may be 75-80% of the height of the upstream column 100, for example, 75%, 76%, 77%, 78%, 79%, 80%. The inventor finds that if the ratio is too high, the bottom end of the mixed slurry inlet pipe is closer to the outlet of the calcium sulfate slurry, the settling distance of the mixed slurry is shorter, and zinc hydroxide particles are possibly mixed into underflow and carried away; if the ratio is too low, the bottom end of the mixed slurry inlet pipe is close to the overflow tank, so that the heavy particles are too close to the overflow tank, a small amount of calcium sulfate heavy particles are discharged from a zinc hydroxide slurry outlet along with the zinc hydroxide light particles, and the quality of the zinc hydroxide light particle product is reduced. The inventor has unexpectedly found through a large number of experiments that the distance between the bottom end of the mixed slurry inlet pipe and the top end of the upstream column in the height direction is most suitable for 75-80% of the height of the upstream column 100, thereby further improving the separation effect of the mixed slurry.
According to another embodiment of the present invention, the height-diameter ratio of the upstream column may be (5-25): 1, for example, 5/10/15/20/25: 1, preferably 10: 1. the inventor finds that if the height-diameter ratio is too large, the upstream column is too fine, the flow velocity of the mixed slurry in the upstream column is increased, and heavy particles are easily brought to an overflow groove to overflow; if the height-diameter ratio is too small, the upstream column is short and thick, the flow velocity of the mixed slurry in the upstream column is reduced, and the light particles are easy to drop and are discharged from a calcium sulfate slurry outlet. The inventor unexpectedly finds out through a large amount of experiments that when the height-diameter ratio of the upstream column is (5-25): 1, a sufficiently long water flow path can be provided, and the solid particles in the mixed slurry can be effectively dispersed, float upwards and sink and then are classified. And when the height-diameter ratio of the upstream column is 10: the grading effect of the grading device can be obviously improved when 1 is used.
According to another embodiment of the present invention, referring to fig. 2, the upstream column 100 may be formed by connecting multiple sub-columns 14 through flanges 15, and the flanges 15 may be sealed by rubber gasket bolts. Therefore, the height of the upward flow column body can be adjusted by increasing or reducing the number of the sub-column bodies, and the grading requirements of different mixed slurry can be flexibly met. For example, when the specific gravity or particle diameter of the solid particles in the mixed slurry is not significantly different, the classification effect of the mixed slurry can be improved by lengthening the height of the upstream column. Further, referring to fig. 3, in order to make the upstream cylinder more stable during operation, a support frame 16 may be provided on the outer wall of the upstream cylinder. Further, the material of the upstream column is not particularly limited, and may be selected by those skilled in the art according to actual needs, for example, at least one selected from common carbon steel, stainless steel, and organic glass.
According to still another embodiment of the present invention, referring to fig. 4, the upstream column 100 may further include a middle outflow port 17, the middle outflow port 17 is located on a side wall of the upstream column 100 and is lower than the zinc hydroxide slurry outlet 13 in a height direction, the middle outflow port 17 is connected to the neutralization device 400, and is adapted to effectively discharge calcium sulfate particles having a medium specific gravity and a medium particle size, and return the part of the calcium sulfate particles having a medium particle size to the neutralization device to promote the growth of the calcium sulfate particles in the neutralization device. Therefore, the recovery of the calcium sulfate with medium particle size can be realized through the height difference with the zinc hydroxide slurry outlet. The median particle size range of calcium sulfate is 20.0-30.0 microns. Further, a plurality of intermediate flow outlets 17 may be included, and the plurality of intermediate flow outlets 17 may be spaced apart on the upstream column. For example, multiple midstream outlets can be arranged along the same cross section of the upflow column to increase the recovery efficiency of the corresponding specific gravity or particle size calcium sulfate slurry at that location; and the calcium sulfate slurry can also be arranged on different cross sections and different longitudinal sections so as to obtain calcium sulfate slurry with different specific gravities or particle sizes and improve the grading effect. Preferably, a plurality of intermediate outflow ports 17 may be spaced along the height direction of the upstream column 100, so that calcium sulfate slurry with a certain specific gravity or particle size in a respective range can be collected from each intermediate outflow port, and the classification effect of the classification device is further improved. Can separate out the calcium sulfate of different particle diameters simultaneously through a plurality of middle sections exports that set up, and then satisfy the demand to different particle diameter calcium sulfate. Further, the angle between the intermediate flow outlet and the horizontal plane is not particularly limited, and can be selected by those skilled in the art according to actual needs.
According to another embodiment of the present invention, referring to fig. 5, the upstream column 100 may further include a water replenishing pipe 18, the water replenishing pipe 18 extends into the interior of the upstream column 100 and has a downward opening, and the water replenishing pipe 18 is located below the bottom end of the mixed slurry inlet pipe 11. The inventors have found that when the difference in specific gravity of the solid particles in the mixed slurry is small, the water replenishing pipe can be opened to offset the sinking speed of the light particles so that the light particles rise while the heavy particles remain falling. Further, the water replenishing pipe 18 is located right below the bottom end of the mixed slurry inlet pipe 11, so that the classification effect of the classification device can be further improved.
According to the utility model discloses a still another embodiment, underflow cylinder 200 includes rotatory inlet tube 21 and calcium sulfate slurry outlet 22, and rotatory inlet tube 21 sets up with the lateral wall tangent of underflow cylinder 200 lower part, and the ejection of compact direction of calcium sulfate slurry outlet 22 sets up with the lateral wall tangent on underflow cylinder 200 upper portion, and in the direction of height, calcium sulfate slurry outlet 22 is located the upper portion of rotatory inlet tube 21, and is suitable for from rotatory inlet tube for the system supply water of handling zinciferous waste liquid and discharge the calcium sulfate slurry that the proportion or the particle size that constantly deposit get off from the calcium sulfate slurry outlet. Specifically, the particle size of calcium sulfate particles in the calcium sulfate slurry discharged from the calcium sulfate slurry outlet is greater than 30.0 microns. The rotary water inlet pipe is arranged in a tangent way with the side wall of the lower part of the underflow cylinder, so that water flow introduced from the rotary water inlet pipe enters along the tangent line of the inner wall of the underflow cylinder, and further the water flow has power of upward vortex motion after entering the underflow cylinder, thereby effectively driving solid particles in the mixed slurry to move and disperse, and finally realizing classification. The discharging direction of the calcium sulfate slurry outlet is tangent to the side wall of the upper part of the underflow cylinder, and the calcium sulfate slurry outlet is positioned at the upper part of the rotary water inlet pipe in the height direction, so that calcium sulfate particles with larger specific gravity and particle size and continuously deposited can be effectively discharged through the calcium sulfate slurry outlet. Further, the material of the underflow column is not particularly limited, and can be selected by those skilled in the art according to actual needs, for example, the underflow column can be selected from at least one of common carbon steel, stainless steel and organic glass.
According to the utility model discloses a concrete embodiment, the projection contained angle of rotatory inlet tube 21 and calcium sulfate thick liquids export 22 at the horizontal plane can be for 0-360 degrees, from this, not only can conveniently rotate the inlet tube and intake and the great mixed thick liquids of calcium sulfate thick liquids export discharge proportion or particle diameter, can also make this structural suitability strong. Further, the projection angle between the rotary water inlet pipe and the calcium sulfate slurry outlet on the horizontal plane is preferably 180 degrees, as shown in fig. 6. This can further improve the efficiency of discharging the calcium sulfate slurry having a large specific gravity or particle diameter from the calcium sulfate slurry outlet.
According to yet another embodiment of the present invention, the ratio of the diameters of the up flow column 100 and the down flow column 200 may be (1.2-2): 1. the inventor finds that the diameter of the underflow cylinder is smaller than that of the overflow cylinder, which is beneficial to improving the vortex effect of water entering from the rotary water inlet pipe and further beneficial to improving the scattering effect of the mixed slurry, so that solid particles in the mixed slurry are dispersed as much as possible to improve the classification effect of the mixed slurry.
According to yet another embodiment of the present invention, a transition cylinder 300 connects the upper flow cylinder 100 and the lower flow cylinder 200 and is adapted to move water entering from the lower flow cylinder to the upper flow cylinder. Specifically, the top end of the transition column body is connected with the bottom end of the upstream column body, the bottom end of the transition column body is connected with the top end of the underflow column body, and the transition column body is connected with the bottom end of the upstream column body and the top end of the underflow column body through welding. Further, the specific shape and structure of the transition cylinder are not particularly limited, and those skilled in the art can select the transition cylinder according to actual needs, for example, the transition cylinder 300 may have a structure with a cross-sectional area gradually decreasing from top to bottom, that is, the diameter of the underflow cylinder is smaller than that of the overflow cylinder, which is beneficial to improving the swirling effect of the water entering from the rotary inlet pipe, and further beneficial to improving the scattering effect of the mixed slurry, so that the solid particles in the mixed slurry are dispersed as much as possible, so as to improve the classification effect of the mixed slurry. This configuration also allows the flow of water rising from the underflow column to move smoothly to the overflow column. Further, the included angle between the sidewall of the transition cylinder 300 and the vertical direction may be 25 to 35 degrees, for example, 25 degrees, 26 degrees, 27 degrees, 28 degrees, 29 degrees, 30 degrees, 31 degrees, 32 degrees, 33 degrees, 34 degrees, 35 degrees. The inventors have found that at this angle there is no excessive loss of water velocity as the ascending water moves from the underflow to the overflow columns, which is advantageous for further improving the classification efficiency of the mixed slurry. Further, the material of the transition column is not particularly limited, and may be selected by a person skilled in the art according to actual needs, for example, the material may be at least one selected from plain carbon steel, stainless steel, and organic glass.
According to the embodiment of the utility model, subside-filter unit 500 has zinc hydroxide thick liquids entry 501, flocculating agent entry 502, rich zinc sediment export 503 and filters back liquid export 504, and zinc hydroxide thick liquids entry 501 links to each other with zinc hydroxide thick liquids export 13, and is suitable for to carry out the settlement reaction with zinc hydroxide thick liquids and flocculating agent to obtain rich zinc sediment and the back liquid of filtering through filtering. Specifically, the flocculant may be PAM or PAC, and the amount of the flocculant to be added may be 10 to 50g, for example, 10g, 20g, 30g, 40g or 50g, based on 1t of the zinc-containing waste liquid. Further, the settling-filtering unit may sequentially comprise a settling device and a filtering device to perform settling treatment on the zinc hydroxide slurry and filtering treatment on the settled slurry, respectively.
According to the utility model discloses system for handle zinciferous waste liquid, acidic zinciferous waste liquid and neutralizer effect back, can obtain the mixed thick liquids that contains zinc hydroxide and calcium sulfate, mix the thick liquids and enter into the underflow cylinder through mixing the thick liquids admission pipe, water gets into the underflow cylinder from rotatory inlet tube simultaneously, because of the tangent setting of the lateral wall of rotatory inlet tube and underflow cylinder lower part, water gets into and upwards forms the vortex rivers along underflow cylinder inner wall tangent line to mix with the mixed thick liquids that lets in. Solid calcium sulfate particles with larger specific gravity or larger particle size in the mixed slurry are deposited downwards and are finally discharged through a calcium sulfate slurry outlet; and the zinc hydroxide particles with smaller specific gravity or smaller particle size move upwards along with the water flow rotating upwards, and finally overflow from the top end of the upflow column body and enter the overflow groove to be discharged through a zinc hydroxide slurry outlet. The obtained zinc hydroxide slurry can be subjected to further flocculation precipitation and filtration to obtain zinc-rich slag, so that zinc can be recovered. Therefore, the system realizes the high-efficiency classification of zinc hydroxide and calcium sulfate with different particle sizes, realizes the recovery of zinc after sedimentation and filtration, can continuously perform the whole process, has simple flow and is easy to realize industrialization.
For convenience of understanding, the following describes in detail a method for treating a zinc-containing waste liquid using the above-described system for treating a zinc-containing waste liquid, which includes, according to an embodiment of the present invention, with reference to fig. 7:
s100: the zinc-containing waste liquid and a neutralizing agent are sent to a neutralizing device for neutralization treatment
In this step, the zinc-containing waste liquid and a neutralizing agent are sent to a neutralization device for neutralization treatment, so as to obtain a mixed slurry. Specifically, the zinc-containing waste liquid is a certain amount of acidic waste water generated in the wet purification washing and demisting processes in zinc smelting, the zinc content in the zinc-containing waste liquid is 120-180g/L, such as 120g/L, 130g/L, 140g/L, 150g/L, 160g/L, 170g/L and 180g/L, and the pH value of the zinc-containing waste liquid can be 0.5-5.0, such as 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5 and 5.0. The neutralizer can be lime or carbide slag and the like which react with the zinc-containing waste liquid to generate zinc hydroxide and calcium sulfate. The addition amount of the neutralizing agent can be determined according to the zinc content in the zinc-containing waste liquid.
S200: sending the mixed slurry to a grading device for grading treatment
And (4) sending the mixed slurry to a grading device for grading treatment so as to obtain zinc hydroxide slurry and calcium sulfate slurry. Specifically, the mixed slurry contains zinc hydroxide particles with the particle size of less than 20.0 microns and calcium sulfate particles with the particle size of not less than 20.0 microns, the mixed slurry enters an upstream flow cylinder through a mixed slurry inlet pipe, water enters an underflow cylinder from a rotary water inlet pipe at the same time, and the water enters along the tangent line of the inner wall of the underflow cylinder to form vortex water flow upwards and is mixed with the introduced mixed slurry due to the fact that the rotary water inlet pipe is arranged in a tangent mode with the side wall of the lower portion of the underflow cylinder. Solid calcium sulfate particles with larger specific gravity or larger particle size in the mixed slurry are deposited downwards and are finally discharged through a calcium sulfate slurry outlet; and the zinc hydroxide particles with smaller specific gravity or smaller particle size move upwards along with the water flow rotating upwards, and finally overflow from the top end of the upflow column body and enter the overflow groove to be discharged through a zinc hydroxide slurry outlet. When a neutral outlet is provided in the classifying device, calcium sulfate particles of a medium size can be discharged from the neutral outlet and can be recovered back to the neutralizing device to promote the growth of calcium sulfate particles in the neutralizing device. According to an embodiment of the present invention, when the feeding speed of the mixed ore slurry is 100-; the medium-sized calcium sulfate particles separated from the medium-sized outlet have a particle size in the range of 20.0 to 30.0 microns, and these smaller particles of calcium sulfate can be returned to the neutralization apparatus to promote the growth of calcium sulfate; the particle size of the calcium sulfate particles separated from the underflow outlet is larger than 30.0 microns.
S300: sending the zinc hydroxide slurry and the flocculating agent to a sedimentation-filtration unit for sedimentation and filtration treatment in sequence
In the step, the zinc hydroxide slurry and the flocculating agent are sent to a sedimentation-filtration unit for sedimentation and filtration treatment in sequence, so as to obtain zinc-rich slag and filtered liquid. Specifically, the flocculant may be PAM or PAC, and the amount of the flocculant to be added may be 10 to 50g, for example, 10g, 20g, 30g, 40g or 50g, based on 1t of the zinc-containing waste liquid.
According to the utility model discloses method of processing zinciferous waste liquid, acidic zinciferous waste liquid and neutralizer effect back can obtain the mixed thick liquids that contains zinc hydroxide and calcium sulfate, and the mixed thick liquids enters into the underflow cylinder through mixing the thick liquids admission pipe, and water gets into the underflow cylinder from rotatory inlet tube simultaneously, because of the tangent setting of the lateral wall of rotatory inlet tube and underflow cylinder lower part, water gets into and upwards forms the vortex rivers along underflow cylinder inner wall tangent line to mix with the mixed thick liquids that lets in. Solid calcium sulfate particles with larger specific gravity or larger particle size in the mixed slurry are deposited downwards and are finally discharged through a calcium sulfate slurry outlet; and the zinc hydroxide particles with smaller specific gravity or smaller particle size move upwards along with the water flow rotating upwards, and finally overflow from the top end of the upflow column body and enter the overflow groove to be discharged through a zinc hydroxide slurry outlet. The obtained zinc hydroxide slurry can be further precipitated and filtered to obtain zinc-rich slag, so that zinc can be recovered. Therefore, the method realizes the high-efficiency classification of zinc hydroxide and calcium sulfate with different particle sizes, realizes the recovery of zinc after sedimentation and filtration, can continuously carry out the whole process, has simple flow and is easy to realize industrialization. It should be noted that the characteristics and advantages of the above system for treating waste liquid containing zinc are also applicable to the method for treating waste liquid containing zinc, and are not described again.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. A system for treating waste liquid containing zinc, comprising:
a neutralization device having a zinc-containing waste liquid inlet, a neutralizer inlet, and a mixed slurry outlet;
grading plant, the grading plant includes from top to bottom:
an upflow column, the top of which is open, comprising:
the mixed slurry inlet pipe extends into the upstream column body from the top of the upstream column body, and is connected with the mixed slurry outlet;
the overflow groove is arranged on the outer side wall of the top of the upstream column body;
a zinc hydroxide slurry outlet, wherein the zinc hydroxide slurry outlet is arranged at the bottom of the overflow tank;
an underflow column, said underflow column comprising:
the rotary water inlet pipe is arranged in a tangent manner with the side wall of the lower part of the underflow cylinder;
a calcium sulfate slurry outlet, wherein the discharging direction of the calcium sulfate slurry outlet is tangent to the side wall of the upper part of the underflow cylinder, and the calcium sulfate slurry outlet is positioned at the upper part of the rotary water inlet pipe in the height direction;
a transition column connecting the up-flow column and the down-flow column;
the sedimentation-filtration unit is provided with a zinc hydroxide slurry inlet, a flocculant inlet, a zinc-rich slag outlet and a filtered liquid outlet, and the zinc hydroxide slurry inlet is connected with the zinc hydroxide slurry outlet.
2. The system for treating zinc-containing waste liquid according to claim 1, wherein said upstream column is composed of multi-sectional columns connected by flanges.
3. The system for treating zinc-containing waste liquid according to claim 1, wherein the ratio of height to diameter of the upstream column is (5-25): 1.
4. the system for treating zinc-containing waste liquid according to claim 1, wherein the distance between the bottom end of the mixed slurry feeding pipe and the top end of the upflow column in the height direction is 75-80% of the height of the upflow column.
5. The system for treating zinc-containing waste liquid according to claim 1, wherein the ratio of the diameter of said up-flow column to said down-flow column is (1.2-2): 1.
6. the system for treating zinc-containing waste liquid according to claim 1, wherein the cross-sectional area of the transition cylinder is gradually reduced from top to bottom, and the included angle between the side wall of the transition cylinder and the vertical direction is 25-35 degrees.
7. The system for treating zinc-containing waste liquid according to claim 1, wherein said upstream column further comprises an intermediate outflow port located on a side wall of said upstream column and lower in height than said zinc hydroxide slurry outlet port.
8. The system for treating zinc-containing waste liquid according to claim 7, wherein a plurality of said intermediate outflow ports are included, and said plurality of intermediate outflow ports are spaced along the height direction of said upstream column.
9. The system for treating zinc-containing waste liquid according to claim 1, wherein the projection angle of the rotary water inlet pipe and the calcium sulfate slurry outlet on the horizontal plane is 0-360 degrees.
10. The system for treating zinc-containing waste liquid according to claim 1, wherein the upstream column further comprises a water replenishing pipe extending into the interior of the upstream column and opening downward, the water replenishing pipe being located below the bottom end of the mixed slurry inlet pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921089980.1U CN210481059U (en) | 2019-07-11 | 2019-07-11 | System for handle zinciferous waste liquid |
| ZA2020/03971A ZA202003971B (en) | 2019-07-11 | 2020-06-30 | System and method for treating zinc-containing waste liquid |
| EP20185116.9A EP3763681B1 (en) | 2019-07-11 | 2020-07-10 | System and method for treating zinc-containing waste liquid |
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| CN201921089980.1U CN210481059U (en) | 2019-07-11 | 2019-07-11 | System for handle zinciferous waste liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110304763A (en) * | 2019-07-11 | 2019-10-08 | 中国恩菲工程技术有限公司 | The system and method for handling zincky waste liquor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110304763A (en) * | 2019-07-11 | 2019-10-08 | 中国恩菲工程技术有限公司 | The system and method for handling zincky waste liquor |
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