CN111302361A - Method for recovering alkali from waste liquid of aluminum profile die - Google Patents
Method for recovering alkali from waste liquid of aluminum profile die Download PDFInfo
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- CN111302361A CN111302361A CN201911030516.XA CN201911030516A CN111302361A CN 111302361 A CN111302361 A CN 111302361A CN 201911030516 A CN201911030516 A CN 201911030516A CN 111302361 A CN111302361 A CN 111302361A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
Abstract
The invention provides a method for recovering alkali from aluminum profile die waste liquid, which comprises the steps of adding aluminum hydroxide into the aluminum profile waste liquid, stirring the aluminum hydroxide into paste, standing the aluminum profile waste liquid, and introducing carbon dioxide into the aluminum profile waste liquid to enable sodium hydroxide in the aluminum profile waste liquid to react with the aluminum hydroxide to generate tetrahydroxy sodium aluminate to be in a saturated state and to generate a precipitation reaction. The method has simple operation, easy control, and high purity and recovery rate of the alkali liquor and the aluminum hydroxide. Meanwhile, the method has low treatment cost and avoids waste liquid pollution. Carbon dioxide is properly introduced, the balanced forward movement of the precipitation reaction can be promoted, the process of the precipitation reaction is accelerated, the treatment efficiency is further promoted, heating is not needed, the energy-saving effect is achieved, the problems that waste liquid treatment equipment is multiple and energy consumption is high are solved, the loss of container equipment is reduced, and the service life of the container equipment is prolonged.
Description
Technical Field
The invention relates to the field of chemical waste liquid treatment, in particular to a method for recovering alkali from waste liquid of an aluminum profile die.
Background
The alkali liquor recovered from the aluminum-containing waste liquid in an aluminum profile factory is generally treated by a crystallization method and a lime adding method, so that the aluminum concentration is reduced and the alkali is recovered. The crystallization method is characterized in that aluminum hydroxide powder is added into an aluminum-containing alkali solution to be recovered, the aluminum hydroxide powder is used as a seed crystal, and the aluminum hydroxide concentration is reduced by controlling a series of temperatures, concentrations and concentration ratios of sodium hydroxide to aluminum, stirring is carried out to enable chemical reaction to occur on sodium aluminate in the solution, aluminum hydroxide is separated out to generate sodium hydroxide, and thus the purpose of recovering the alkali by reducing the aluminum concentration is achieved, the method has the defects that the concentration ratio of sodium hydroxide to aluminum hydroxide, the concentration of sodium hydroxide and the temperature in waste liquid are required, continuous stirring is required in the production process, otherwise, the aluminum hydroxide is settled, the temperature is required to be controlled to be 40-45 ℃, the efficiency is influenced by overhigh or overlow temperature, and the concentration of sodium hydroxide is required to be controlled to be 40-60 g/: less than 1, but the mold-cooking liquid is difficult to control the actual process due to unstable temperature and sodium aluminum hydroxide concentration and proportion, and needs to require matched temperature control equipment and stirring equipment, so that the occupied area is large. The lime adding method is that quicklime is added into aluminum-containing alkali liquor which needs to be recovered, calcium aluminate is generated through reaction and is insoluble in alkali, the operation of the method is simple and does not have requirements on the concentration and proportion of sodium hydroxide and aluminum, the efficiency is high, but the quicklime is dissolved in water to release a large amount of heat, when the method is used, cooling equipment is needed or the quicklime is added after water is added into treatment liquid for cooling, the requirement on the safety of operation is met, matched equipment is needed, the equipment investment of the method is large, the occupied area is large, a large amount of calcium aluminate slag is generated in the production process, the quicklime needs to be added quantitatively, the cost is higher than that of a crystallization method, impurities brought by the added quicklime can pollute a bath solution, and influence on the surface treatment of aluminum profiles.
For example, patent No. 201811550406.1 discloses a method for recycling waste lye, which can completely recycle and recycle the waste lye through a reaction unit, a solid-liquid separation unit and a rectification unit. Still like patent No. CN209081992U discloses an aluminium extrusion die utensil alkali wash equipment alkali wash waste liquid recycle system, a kind of deep pot mould alkali lye recovery tank and alkali lye preparation jar intercommunication, the separation groove of crystallization and a kind of deep pot mould alkali lye recovery tank intercommunication, separation groove of crystallization upper portion and middle basin intercommunication, set up the mixer in the separation groove of crystallization, the mixer is connected with control unit, set up the heater in the separation groove of crystallization, the heater is connected with control unit, realizes retrieving the alkali lye after the alkali wash.
In the field of chemical waste liquid treatment, particularly in the field of aluminum profile waste liquid treatment, many practical problems requiring treatment in practical application still have unrefined solutions.
Disclosure of Invention
The invention provides a method for recovering alkali from aluminum profile die waste liquid to solve the problem.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for recovering alkali from aluminum profile die waste liquid comprises the steps of adding aluminum hydroxide into the aluminum profile waste liquid, stirring the aluminum profile waste liquid into paste, standing the paste, and introducing carbon dioxide into the paste, so that sodium hydroxide in the aluminum profile waste liquid and the aluminum hydroxide react to generate sodium tetrahydroxy aluminate, the generated sodium tetrahydroxy aluminate reaches a saturated state and is subjected to precipitation reaction, and the chemical formula of the precipitation reaction is as follows:
x Al(OH)3+NaAl(OH)4＝(x+1)Al(OH)3+NaOH。
optionally, the addition amount of the aluminum hydroxide is: 1L of the aluminum profile mold waste liquid is added with not less than 240g of the aluminum hydroxide.
A method for recovering alkali from waste liquid of an aluminum profile die comprises the following steps:
(1) taking waste liquid in the aluminum profile die to a stirring kettle;
(2) adding aluminum hydroxide into the waste liquid, starting the stirring kettle to stir until the waste liquid is pasty, stopping stirring, standing, introducing carbon dioxide into the stirring kettle, standing for 2-6d, adding water according to the mass ratio of the paste to the water of 1:0.4-0.6, starting the stirring kettle to stir for 10-20min, and standing for 1-3 h;
(3) and (3) introducing the mixed liquid obtained in the step (2) into a filter press for pressing slag to obtain alkali liquor and aluminum hydroxide.
Optionally, the waste liquid is any one of a die-pouring liquid of an aluminum profile extrusion die, a diluent of the die-pouring liquid, an aluminum ash liquid dissolved by sodium hydroxide or an alkaline etching liquid of oxidation pretreatment.
Optionally, the mold-cooking liquid is an alkaline bath solution containing sodium metaaluminate and generated by dissolving aluminum by sodium hydroxide.
Optionally, after recovering the aluminum hydroxide, detecting that the concentration of aluminum ions in the alkali liquor is lower than 10g/L, and if the concentration of aluminum ions in the alkali liquor is higher than or equal to 10g/L, returning the alkali liquor to the stirred tank for repeating the treatment steps.
Optionally, the lye is recovered on-line; and in the on-line recovery, after solid-liquid separation, the obtained alkali liquor is directly returned to the die cavity for recycling, and the obtained aluminum hydroxide can be directly returned to the die cavity for continuous recycling as seed crystal.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the method for recovering the alkali from the aluminum profile mold waste liquid is simple to operate and easy to control, the concentration of aluminum ions in the alkali liquid obtained after treatment can be controlled to be below 10g/L, and the recovery rate of aluminum hydroxide is high.
2. According to the method for recovering alkali from the aluminum profile die waste liquid, the aluminum hydroxide is controlled to be added to form paste, the paste is easy to store and convenient to take, when the paste is recycled on line, the alkali liquid and the aluminum hydroxide can be recycled on line by adding water and stirring, standing and settling or centrifugal separation without adding other auxiliary equipment, the operability, convenience and safety of treatment are greatly improved, meanwhile, the treatment cost is reduced, and waste liquid pollution is avoided.
3. The method for recovering alkali from the aluminum profile die waste liquid has the advantages that carbon dioxide is properly introduced into the stirring kettle, the precipitation reaction can be promoted to move in a balanced and forward direction, the precipitation reaction process is accelerated, the treatment efficiency is further promoted, heating is not needed, and the method has the advantage of energy conservation.
4. The method for recovering alkali from the waste liquid of the aluminum profile mold can effectively reduce the generation of aluminum scale on the wall of the container, greatly reduce the maintenance frequency, greatly prolong the maintenance period, protect the container equipment and prolong the service life of the container equipment.
Drawings
The invention will be further understood from the following description in conjunction with the accompanying drawings.
FIG. 1 is a schematic flow chart of a method for recovering alkali from aluminum profile mold waste liquid in one embodiment of the invention;
FIG. 2 is a schematic diagram of the source of aluminum-containing waste slag from a certain aluminum profile factory.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to embodiments thereof; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows. The examples are illustrative and should not be construed as limiting the patent, and those skilled in the art will understand the specific meaning of the terms in the context of their application.
The invention relates to a method for recovering alkali from waste liquid of an aluminum profile die, which explains the following embodiments according to the description of the attached drawings:
example 1:
a method for recovering alkali from aluminum profile die waste liquid comprises the steps of adding aluminum hydroxide into the aluminum profile waste liquid, stirring the aluminum profile waste liquid into paste, standing the paste, and introducing carbon dioxide into the paste, so that sodium hydroxide in the aluminum profile waste liquid and the aluminum hydroxide react to generate sodium tetrahydroxy aluminate, the generated sodium tetrahydroxy aluminate reaches a saturated state and is subjected to precipitation reaction, and the chemical formula of the precipitation reaction is as follows:
x Al(OH)3+NaAl(OH)4＝(x+1)Al(OH)3+NaOH。
wherein the adding amount of the aluminum hydroxide is as follows: the adding amount of the aluminum hydroxide in the aluminum profile mold waste liquid is 240 g/L.
Specifically, the method for recovering alkali from the waste liquid of the aluminum profile mold comprises the following steps:
(1) taking waste liquid in the aluminum profile die to a stirring kettle;
(2) adding aluminum hydroxide into the waste liquid, starting the stirring kettle to stir until the waste liquid is pasty, stopping stirring, standing, introducing carbon dioxide into the stirring kettle, standing for 2d, adding water according to the mass ratio of the pasty material to the water of 1:0.4, starting the stirring kettle to stir for 10-20min, and standing for 1-3 h;
(3) and (3) introducing the mixed liquid obtained in the step (2) into a filter press for pressing slag to obtain alkali liquor and aluminum hydroxide.
Wherein the waste liquid is any one of die-cooking liquid, diluent of the die-cooking liquid, aluminum ash liquid dissolved by sodium hydroxide or alkaline etching liquid subjected to oxidation pretreatment of the aluminum profile extrusion die; the mold boiling liquid is alkaline bath liquid containing sodium metaaluminate and generated by dissolving aluminum by sodium hydroxide; after recovering aluminum hydroxide, detecting that the concentration of aluminum ions in the alkali liquor is lower than 10g/L, and if the concentration of the aluminum ions in the alkali liquor is higher than or equal to 10g/L, returning the alkali liquor to the stirring kettle for repeated treatment; the alkali liquor is recycled on line; and in the on-line recovery, after solid-liquid separation, the obtained alkali liquor is directly returned to the die cavity for recycling, and the obtained aluminum hydroxide can be directly returned to the die cavity for continuous recycling as seed crystal.
Example 2:
a method for recovering alkali from aluminum profile die waste liquid comprises the steps of adding aluminum hydroxide into the aluminum profile waste liquid, stirring the aluminum profile waste liquid into paste, standing the paste, and introducing carbon dioxide into the paste, so that sodium hydroxide in the aluminum profile waste liquid and the aluminum hydroxide react to generate sodium tetrahydroxy aluminate, the generated sodium tetrahydroxy aluminate reaches a saturated state and is subjected to precipitation reaction, and the chemical formula of the precipitation reaction is as follows:
x Al(OH)3+NaAl(OH)4＝(x+1)Al(OH)3+NaOH。
wherein the adding amount of the aluminum hydroxide is as follows: and the addition amount of the aluminum hydroxide in the aluminum profile die waste liquid is 5 g/L.
Specifically, the method for recovering alkali from the waste liquid of the aluminum profile mold comprises the following steps:
(1) taking waste liquid in the aluminum profile die to a stirring kettle;
(2) adding aluminum hydroxide into the waste liquid, starting the stirring kettle to stir until the waste liquid is pasty, stopping stirring, standing, introducing carbon dioxide into the stirring kettle, reacting the carbon dioxide with precipitated or sodium hydroxide in the pasty waste liquid to generate sodium carbonate, facilitating the reaction to the direction of precipitation of the aluminum hydroxide, standing for 6d, adding water according to the mass ratio of the paste to the water of 1:0.6, starting the stirring kettle to stir for 10-20min, and standing for 1-3 h;
(3) and (3) introducing the mixed liquid obtained in the step (2) into a filter press for pressing slag to obtain alkali liquor and aluminum hydroxide. Of course, the slurry waste liquid may be centrifuged after adding water thereto.
Wherein the waste liquid is any one of die-cooking liquid, diluent of the die-cooking liquid, aluminum ash liquid dissolved by sodium hydroxide or alkaline etching liquid subjected to oxidation pretreatment of the aluminum profile extrusion die; the mold boiling liquid is alkaline bath liquid containing sodium metaaluminate and generated by dissolving aluminum by sodium hydroxide; after recovering aluminum hydroxide, detecting that the concentration of aluminum ions in the alkali liquor is lower than 10g/L, and if the concentration of the aluminum ions in the alkali liquor is higher than or equal to 10g/L, returning the alkali liquor to the stirring kettle for repeated treatment; the alkali liquor is recycled on line; and in the on-line recovery, after solid-liquid separation, the obtained alkali liquor is directly returned to the die cavity for recycling, and the obtained aluminum hydroxide can be directly returned to the die cavity for continuous recycling as seed crystal.
Example 3:
a method for recovering alkali from aluminum profile die waste liquid comprises the steps of adding aluminum hydroxide into the aluminum profile waste liquid, stirring the aluminum profile waste liquid into paste, standing the paste, and introducing carbon dioxide into the paste, so that sodium hydroxide in the aluminum profile waste liquid and the aluminum hydroxide react to generate sodium tetrahydroxy aluminate, the generated sodium tetrahydroxy aluminate reaches a saturated state and is subjected to precipitation reaction, and the chemical formula of the precipitation reaction is as follows:
x Al(OH)3+NaAl(OH)4＝(x+1)Al(OH)3+NaOH。
wherein the adding amount of the aluminum hydroxide is as follows: the addition amount of the aluminum hydroxide in the aluminum profile mold waste liquid is 8 g/L.
Specifically, the method for recovering alkali from the waste liquid of the aluminum profile mold comprises the following steps:
(1) taking waste liquid in the aluminum profile die to a stirring kettle;
(2) adding aluminum hydroxide into the waste liquid, starting the stirring kettle to stir until the waste liquid is pasty, stopping stirring, standing, introducing carbon dioxide into the stirring kettle, standing for 4d, adding water according to the mass ratio of the pasty material to the water of 1:0.5, starting the stirring kettle to stir for 10-20min, and standing for 1-3 h;
(3) and (3) introducing the mixed liquid obtained in the step (2) into a filter press for pressing slag to obtain alkali liquor and aluminum hydroxide.
Wherein the waste liquid is any one of die-cooking liquid, diluent of the die-cooking liquid, aluminum ash liquid dissolved by sodium hydroxide or alkaline etching liquid subjected to oxidation pretreatment of the aluminum profile extrusion die; the mold boiling liquid is alkaline bath liquid containing sodium metaaluminate and generated by dissolving aluminum by sodium hydroxide; after recovering aluminum hydroxide, detecting that the concentration of aluminum ions in the alkali liquor is lower than 10g/L, and if the concentration of the aluminum ions in the alkali liquor is higher than or equal to 10g/L, returning the alkali liquor to the stirring kettle for repeated treatment; the alkali liquor is recycled on line; and in the on-line recovery, after solid-liquid separation, the obtained alkali liquor is directly returned to the die cavity for recycling, and the obtained aluminum hydroxide can be directly returned to the die cavity for continuous recycling as seed crystal.
Comparative example 1:
a method for recovering alkali from aluminum profile die waste liquid comprises the steps of adding aluminum hydroxide into the aluminum profile waste liquid, stirring the aluminum hydroxide into paste, standing the aluminum profile waste liquid, enabling sodium hydroxide in the aluminum profile waste liquid to react with the aluminum hydroxide to generate sodium tetrahydroxy aluminate, enabling the generated sodium tetrahydroxy aluminate to reach a saturated state, and enabling a precipitation reaction to occur, wherein the chemical formula of the precipitation reaction is as follows:
x Al(OH)3+NaAl(OH)4＝(x+1)Al(OH)3+NaOH。
wherein the adding amount of the aluminum hydroxide is as follows: the addition amount of the aluminum hydroxide in the aluminum profile mold waste liquid is 8 g/L.
Specifically, the method for recovering alkali from the waste liquid of the aluminum profile mold comprises the following steps:
(1) taking waste liquid in the aluminum profile die to a stirring kettle;
(2) adding aluminum hydroxide into the waste liquid, starting the stirring kettle to stir until the waste liquid is pasty, stopping stirring, standing for 4d, adding water according to the mass ratio of the pasty material to the water of 1:0.5, starting the stirring kettle to stir for 10-20min, and standing for 1-3 h;
(3) and (3) introducing the mixed liquid obtained in the step (2) into a filter press for pressing slag to obtain alkali liquor and aluminum hydroxide.
Wherein the waste liquid is any one of die-cooking liquid, diluent of the die-cooking liquid, aluminum ash liquid dissolved by sodium hydroxide or alkaline etching liquid subjected to oxidation pretreatment of the aluminum profile extrusion die; the mold boiling liquid is alkaline bath liquid containing sodium metaaluminate and generated by dissolving aluminum by sodium hydroxide; after recovering aluminum hydroxide, detecting that the concentration of aluminum ions in the alkali liquor is lower than 10g/L, and if the concentration of the aluminum ions in the alkali liquor is higher than or equal to 10g/L, returning the alkali liquor to the stirring kettle for repeated treatment; the alkali liquor is recycled on line; and in the on-line recovery, after solid-liquid separation, the obtained alkali liquor is directly returned to the die cavity for recycling, and the obtained aluminum hydroxide can be directly returned to the die cavity for continuous recycling as seed crystal.
In this embodiment, the method for checking the concentration of aluminum ions in the alkali solution comprises: in the online recovery process, an aluminum ion concentration detection sensor is arranged, the concentration of ions in a substance to be sensed is detected through the drift of the threshold voltage of the source-drain current characteristic by the grid-source voltage, the concentration detection sensor is connected with a controller, the controller can analyze and compare the concentration data detected by the concentration detection sensor with the preset aluminum ion concentration to judge whether the treatment steps need to be repeated, and an operator performs corresponding operation according to the judgment.
Comparative example 2:
a method for recovering alkali from aluminum profile die waste liquid comprises the steps of adding aluminum hydroxide into the aluminum profile waste liquid, stirring the aluminum profile waste liquid into paste, standing the paste, and introducing carbon dioxide into the paste, so that sodium hydroxide in the aluminum profile waste liquid and the aluminum hydroxide react to generate sodium tetrahydroxy aluminate, the generated sodium tetrahydroxy aluminate reaches a saturated state and is subjected to precipitation reaction, and the chemical formula of the precipitation reaction is as follows:
x Al(OH)3+NaAl(OH)4＝(x+1)Al(OH)3+NaOH。
CO2+NaOH＝Na2CO3
wherein the adding amount of the aluminum hydroxide is as follows: the addition amount of the aluminum hydroxide in the aluminum profile die waste liquid is 1.2 g/L.
Specifically, the method for recovering alkali from the waste liquid of the aluminum profile mold comprises the following steps:
(1) taking waste liquid in the aluminum profile die to a stirring kettle;
(2) adding aluminum hydroxide into the waste liquid, starting the stirring kettle to stir until the waste liquid is pasty, stopping stirring, standing, introducing carbon dioxide into the stirring kettle, standing for 4d, adding water according to the mass ratio of the pasty material to the water of 1:0.5, starting the stirring kettle to stir for 10-20min, and standing for 1-3 h;
(3) and (3) introducing the mixed liquid obtained in the step (2) into a filter press for pressing slag to obtain alkali liquor and aluminum hydroxide.
Wherein the waste liquid is any one of die-cooking liquid, diluent of the die-cooking liquid, aluminum ash liquid dissolved by sodium hydroxide or alkaline etching liquid subjected to oxidation pretreatment of the aluminum profile extrusion die; the mold boiling liquid is alkaline bath liquid containing sodium metaaluminate and generated by dissolving aluminum by sodium hydroxide; after recovering aluminum hydroxide, detecting that the concentration of aluminum ions in the alkali liquor is lower than 10g/L, and if the concentration of the aluminum ions in the alkali liquor is higher than or equal to 10g/L, returning the alkali liquor to the stirring kettle for repeated treatment; the alkali liquor is recycled on line; and in the on-line recovery, after solid-liquid separation, the obtained alkali liquor is directly returned to the die cavity for recycling, and the obtained aluminum hydroxide can be directly returned to the die cavity for continuous recycling as seed crystal.
Comparative example 3:
a treatment method of aluminum wastewater slag comprises the following steps:
and (3) drying: drying the aluminum wastewater slag by using a rotary furnace until the water content is 8%;
alkali dissolution: adding the dried aluminum waste water slag into alkali liquor, and heating to 100 ℃ to dissolve the aluminum waste water slag; the concentration of hydroxide ions in the alkali liquor is 4 mol/L; adding hot alkali liquor to make the concentration of aluminum ions be 4 mol/L;
cooling and crystallizing: the dissolved liquid is filtered while being hot, and is cooled to 23 ℃ at the speed of 10 ℃/h, and aluminum hydroxide crystals are separated out;
separation: filtering and recovering the alkali liquor and the crystals.
The aluminum hydroxide recovered in example 3 was tested, and the results and analysis were as follows:
the alkali liquor recovered in the examples 1 to 3 and the comparative examples 1 to 3 and the recovered aluminum hydroxide are detected, and the detection results are as follows:
the analysis of the data shows that the alkali liquor and the aluminum hydroxide recovered in the aluminum profile waste liquid recovery process have high purity, the operation such as heating is not needed, and the energy-saving advantage is achieved.
In conclusion, the invention provides the method for recovering the alkali from the waste liquid of the aluminum profile mold, and the method has the advantages of simple operation, high treatment efficiency and low treatment cost.
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. That is, the methods discussed above are examples. Various configurations may omit, substitute, or add various procedures or components as appropriate. For example, in alternative configurations, the methods may be performed in an order different than that described, and/or various components may be added, omitted, and/or combined. Moreover, features described with respect to certain configurations may be combined in various other configurations, as different aspects and elements of the configurations may be combined in a similar manner. Further, elements therein may be updated as technology evolves, i.e., many elements are examples and do not limit the scope of the disclosure or claims.
Specific details are given in the description to provide a thorough understanding of the exemplary configurations including implementations. However, configurations may be practiced without these specific details, for example, well-known processes and techniques have been shown without unnecessary detail in order to avoid obscuring the configurations. This description provides example configurations only, and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made in the function and arrangement of elements without departing from the spirit or scope of the disclosure.
It is intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, that are intended to define the spirit and scope of this invention. The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (7)
1. The method for recovering alkali from the waste liquid of the aluminum profile die is characterized in that aluminum hydroxide is added into the waste liquid of the aluminum profile die, the waste liquid of the aluminum profile die is stirred to be pasty, the waste liquid of the aluminum profile die is kept stand, carbon dioxide is introduced, so that sodium hydroxide in the waste liquid of the aluminum profile die and the aluminum hydroxide react to generate sodium tetrahydroxy aluminate, the generated sodium tetrahydroxy aluminate reaches a saturated state and is subjected to precipitation reaction, and the chemical formula of the precipitation reaction is as follows:
x Al(OH)3+NaAl(OH)4＝(x+1)Al(OH)3+NaOH。
2. the method for recovering alkali from the aluminum profile die waste liquid as claimed in claim 1, wherein the addition amount of the aluminum hydroxide is as follows: 1L of the aluminum profile mold waste liquid is added with not less than 240g of the aluminum hydroxide.
3. The method for recovering alkali from the aluminum profile mold waste liquid according to claim 1, characterized by comprising the following steps of:
(1) taking waste liquid in the aluminum profile die to a stirring kettle;
(2) adding aluminum hydroxide into the waste liquid, starting the stirring kettle to stir until the waste liquid is pasty, stopping stirring, standing, introducing carbon dioxide into the stirring kettle, standing for 2-6d, adding water according to the mass ratio of the paste to the water of 1:0.4-0.6, starting the stirring kettle to stir for 10-20min, and standing for 1-3 h;
(3) and (3) introducing the mixed liquid obtained in the step (2) into a filter press for pressing slag to obtain alkali liquor and aluminum hydroxide.
4. The method for recovering alkali from the aluminum profile die waste liquid according to claim 3, wherein the waste liquid is any one of a die-casting liquid, a diluent of the die-casting liquid, an aluminum ash liquid dissolved by sodium hydroxide or an alkaline etching liquid pre-treated by oxidation of an aluminum profile extrusion die.
5. The method for recovering alkali from the aluminum profile mold waste liquid as recited in claim 4, wherein the mold-stewing liquid is an alkaline bath solution containing sodium metaaluminate, which is generated by dissolving aluminum with sodium hydroxide.
6. The method for recovering alkali from the aluminum profile die waste liquid as claimed in claim 3, wherein after aluminum hydroxide is recovered, the aluminum ion concentration in the alkali liquid is detected to be lower than 10g/L, and if the aluminum ion concentration in the alkali liquid is higher than or equal to 10g/L, the alkali liquid needs to be returned to the stirring kettle for repeated treatment.
7. The method for recovering alkali from the aluminum profile die waste liquid as claimed in claim 3, wherein the alkali liquid is recovered on line; and in the on-line recovery, after solid-liquid separation, the obtained alkali liquor is directly returned to the die cavity for recycling, and the obtained aluminum hydroxide can be directly returned to the die cavity for continuous recycling as seed crystal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112607757A (en) * | 2020-12-23 | 2021-04-06 | 佛山市三水凤铝铝业有限公司 | Method for recovering alkali from waste alkali liquor |
| CN113816527A (en) * | 2021-09-28 | 2021-12-21 | 江苏凯莱德环保科技有限公司 | Novel treatment method for recycling and reusing aluminum die-breaking alkaline washing wastewater |
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