Equipment and method for removing iron from hot galvanizing plating assistant liquid
阅读说明：本技术 一种热镀锌助镀液除铁的设备及方法 (Equipment and method for removing iron from hot galvanizing plating assistant liquid ) 是由 刘伟明 李玉奇 姚植文 赵德松 于 2020-06-05 设计创作，主要内容包括：本发明公开了一种热镀锌助镀液除铁的设备及方法,涉及热镀锌助镀液的除铁工艺领域,为解决热镀锌助镀液的除铁耗时较长的问题；本发明包括步骤一：测量助镀池中助镀液的pH值,将pH值调至大于1.7且小于5.0；步骤二：将助镀池中的助镀液加热至60℃-80℃；步骤三：向助镀液中加入氧化剂和絮凝剂搅拌；步骤四：利用第一酸泵将助镀液输送至离心机离心；步骤五：过滤离心后的助镀液,除去沉淀保留清液；步骤六：通过第二酸泵将清液输送回助镀池；本发明可在过滤前破坏较氢氧化铁胶体颗粒,提高过滤速度,加快除铁速度。(The invention discloses equipment and a method for removing iron from hot galvanizing plating assistant liquid, relates to the field of iron removal process of hot galvanizing plating assistant liquid, and aims to solve the problem that the iron removal of hot galvanizing plating assistant liquid takes longer time; the invention comprises the following steps: measuring the pH value of the plating assistant solution in the plating assistant tank, and adjusting the pH value to be more than 1.7 and less than 5.0; step two: heating the plating assistant solution in the plating assistant tank to 60-80 ℃; step three: adding an oxidant and a flocculating agent into the plating assistant solution and stirring; step four: conveying the plating assistant solution to a centrifugal machine for centrifugation by using a first acid pump; step five: filtering the centrifuged plating assistant solution, removing the precipitate and reserving clear liquid; step six: conveying the clear liquid back to the plating assistant tank through a second acid pump; the invention can destroy ferric hydroxide colloid particles before filtration, improve the filtration speed and accelerate the iron removal speed.)
1. The utility model provides an equipment of hot-galvanize helps plating bath deironing, includes and helps plating pond (1), its characterized in that: still include first acid pump (2), centrifuge (3), filter (4) and second acid pump (5), help the inlet of the liquid outlet intercommunication first acid pump (2) of plating pond (1), the liquid outlet intercommunication inlet of first acid pump (2) centrifuge (3), the liquid outlet intercommunication inlet of filter (4) of centrifuge (3), the liquid outlet intercommunication inlet of second acid pump (5) of filter (4), the liquid outlet intercommunication of second acid pump (5) helps the inlet of plating pond (1), help plating pond (1) and install heater (6) and agitator (11).
2. The apparatus for removing iron from hot galvanizing plating assistant solution according to claim 1 is characterized in that: the filter (4) is a bag filter.
3. A method for removing iron from a hot galvanizing plating assistant solution is characterized in that the method adopts the equipment for removing iron from the hot galvanizing plating assistant solution as claimed in claim 1 or 2, and the method comprises the following specific steps:
the method comprises the following steps: measuring the pH value of the plating assistant solution in the plating assistant tank (1), and adjusting the pH value to be more than 1.7 and less than 5.0;
step two: heating the plating assistant solution in the plating assistant tank (1) to 60-80 ℃ by a heater (6);
step three: adding an oxidant and a flocculating agent into the plating assistant solution in the plating assistant tank (1), and stirring by using a stirrer (11);
step four: conveying the plating assistant solution to a centrifuge (3) by using a first acid pump (2) for centrifugation;
step five: conveying all the effluent of the centrifuge (3) into a filter (4), filtering the effluent by using the filter (4), removing precipitates, and retaining clear liquid;
step six: the clear solution is conveyed back to the plating assistant tank (1) by a second acid pump (5).
4. The method for removing iron from hot galvanizing plating assistant solution according to claim 3, characterized in that: and (3) adjusting the pH value to 3.0-4.0 in the first step, adding ammonia water if the pH value is less than 3.0 during the pH adjustment, and adding hydrochloric acid if the pH value is more than 4.0.
5. The method for removing iron from hot galvanizing plating assistant solution according to claim 3, characterized in that: in the second step, the plating assistant solution is heated to 80 ℃.
6. The method for removing iron from hot galvanizing plating assistant solution according to claim 3, characterized in that: the oxidant in step three is 30% aqueous hydrogen peroxide.
7. The method for removing iron from hot galvanizing plating assistant solution according to claim 3, characterized in that: the flocculating agent in the third step is cationic flocculating agent polyacrylamide.
Technical Field
The invention relates to the field of iron removal processes of hot galvanizing plating assistant liquid, in particular to equipment and a method for removing iron from the hot galvanizing plating assistant liquid.
Background
Hot galvanizing, also called hot dip galvanizing, is one of the most effective means for delaying the environmental corrosion of steel materials, and is characterized in that a steel product with a cleaned and activated surface is immersed in molten zinc liquid, and a zinc alloy coating with good adhesiveness is plated on the surface of the steel product through the reaction and diffusion between iron and zinc; the hot galvanizing process has an important step, namely, the dipping assistant plating solution treatment is carried out before the zinc dipping after the acid washing, so as to improve the quality of the process, wherein the assistant plating solution is a mixed solution mainly containing zinc chloride, and is generally used repeatedly to save resources, but in the using process, a large amount of ferrous ions are dissolved in the assistant plating solution, so that zinc slag is easily generated in the assistant plating solution, waste is caused, the fixed plating solution needs to be subjected to iron removal treatment regularly, the iron removal principle is that the ferrous ions are oxidized into the ferric ions by utilizing hydrogen peroxide, ferric hydroxide precipitate is generated by reaction in an ammonia water environment, and the precipitate is removed by filtering.
At present, the hot galvanizing plating assistant solution for removing iron is generally filtered by a plate-and-frame filter press to generate ferric hydroxide, and then the plating assistant solution is pumped back to a plating assistant tank for reaction and is circularly carried out; however, iron hydroxide is easy to form and is difficult to filter compared with iron hydroxide colloid particles, so that a filtering device is easy to block, the filtering time is long, the filtering device needs to be cleaned frequently, the iron removal speed is low, the efficiency is low, the labor intensity is high, and even if an automatic backwashing system is adopted to remove filter cakes, much time is consumed; the utility model patent with application number 201820483313.0, entitled "an apparatus for removing iron on line with plating aid" mentions a method for reducing sludge specific resistance of ferric hydroxide colloid by using cationic PAM flocculant to destabilize ferric hydroxide colloid particles, but only the flocculant is limited in its ability to destroy ferric hydroxide colloid particles, and still needs to be improved.
Disclosure of Invention
The invention aims to provide equipment and a method for removing iron in hot galvanizing plating assistant liquid, which destroy ferric hydroxide colloid before filtering, reduce the times of stopping to clean a filtering device, reduce the complexity of cleaning and replacing the filtering device, and accelerate the speed of removing iron so as to solve the problems in the prior art.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the utility model provides an equipment of hot-galvanize helps plating bath deironing, includes helps plating pond, first acid pump, centrifuge, bag filter and second acid pump, helps the liquid outlet of plating the pond and communicates the inlet of first acid pump, the liquid outlet of first acid pump communicates the inlet of centrifuge, the liquid outlet of centrifuge communicates the inlet of bag filter, the liquid outlet of bag filter communicates the inlet of second acid pump, the liquid outlet of second acid pump communicates the inlet of helping plating the pond, help to plate the pond and install heater and agitator.
Preferably, the filter is a bag filter.
A method for removing iron from hot galvanizing plating assistant solution comprises the following steps:
the method comprises the following steps: measuring the pH value of the plating assistant solution in the plating assistant tank, and adjusting the pH value to be more than 1.7 and less than 5.0;
step two: heating the plating assistant solution in the plating assistant pool to 60-80 ℃ by a heater;
step three: adding an oxidant and a flocculating agent into the plating assistant liquid in the plating assistant pool, and stirring by using a stirrer;
step four: and conveying the plating assistant solution to a centrifugal machine for centrifugation by using a first acid pump.
Step five: conveying all effluents of the centrifuge into a filter, filtering the effluents by using the filter, removing precipitates, and retaining clear liquid;
step six: the clear solution is delivered back to the plating-assistant tank by a second acid pump.
Preferably, the pH value is adjusted to 3.0-4.0 in the step one, ammonia water is added when the pH value is less than 3.0, and hydrochloric acid is added when the pH value is more than 4.0.
Preferably, in the second step, the plating assistant solution is heated to 80 ℃.
Preferably, the oxidizing agent in step three is 30% aqueous hydrogen peroxide.
Preferably, the flocculating agent in the third step is cationic flocculating agent polyacrylamide.
Compared with the prior art, the invention has the beneficial effects that:
1. the centrifugal machine is arranged in front of the filter, so that the filter can effectively destroy ferric hydroxide colloid particles, the problem of blockage of a filter device caused by the ferric hydroxide colloid particles is reduced, the time required by filtering is shortened, and the speed of removing iron from the hot galvanizing plating assistant solution is increased;
2. compared with the traditional plate-frame filter, the bag-type filter has the advantages that the dirt capacity of the filter device is large, more plating assistant liquid can be continuously filtered, the filter bag is simple to replace and convenient to clean, only the filter bag needs to be cleaned, the machine body does not need to be cleaned, the shutdown cleaning time is shortened, and the iron removal speed of the hot galvanizing plating assistant liquid is increased.
Drawings
FIG. 1 is a schematic process flow diagram of one embodiment of the present invention.
In the figure: 1. a plating assisting tank; 2. a first acid pump; 3. a centrifuge; 4. a filter; 5. a second acid pump; 6. a heater; 11. a blender.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The existing hot galvanizing plating assistant solution iron removal equipment can be simplified and understood as three parts of reaction, filtration and conveying, wherein the filtration part generally uses a plate and frame filter, and iron hydroxide colloid particles are easy to block when passing through a filter device of the filter.
The specific implementation mode provided by the invention is as follows:
referring to fig. 1, an apparatus for removing iron from a hot-dip galvanizing plating aid comprises a plating aid tank 1, a first acid pump 2, a
The filter 4 can use a bag filter, compared with a plate-and-frame filter, the filter device has the advantages that the dirt holding capacity is large, more plating-assistant liquid can be continuously filtered, the filter bag is simple to replace and convenient to clean, the filter bag only needs to be cleaned, the machine body does not need to be cleaned, the shutdown cleaning time is shortened, and the iron removing speed of the hot galvanizing plating-assistant liquid is increased. The aperture of the filter bag of the bag filter can be 25 microns, the aperture can meet the filtering operation of removing iron from the hot galvanizing plating assistant liquid, if the aperture is too small, the iron removing speed can be reduced, and filter leakage can be caused if the aperture is too large.
A device and a method for removing iron from hot galvanizing plating assistant solution comprise the following steps:
the method comprises the following steps: measuring the pH value of the plating assistant solution in the plating assistant tank 1, and adjusting the pH value to be more than 1.7 and less than 5.0, wherein the iron ions in the plating assistant tank 1 generally exist in a state of ferrous chloride, and the ferrous ions are hydrolyzed and precipitated when the pH value is more than 8.5 or the zinc content is not large and the ferrous ion content is large, so that the ferrous ions must be firstly converted into the iron ions, the hydrolysis condition of the iron ions is only that the pH value is more than 1.7, the hydrolysis pH value of the zinc is 5.0-5.5, and in order to avoid the waste of the zinc and remove the iron ions as far as possible, the pH value is more than 1.7 and less than 5.0; further, the pH value can be adjusted to 3.0-4.0, theoretically, the pH value can be only 1.7-5.0, but in order to avoid zinc waste and facilitate control, the pH value is preferably adjusted to 3.0-4.0, ammonia water or zinc powder or zinc oxide can be added if the pH value is less than 3.0, and hydrochloric acid or hypochlorous acid can be added if the pH value is more than 4.0 during the pH adjustment;
step two: the plating assistant solution in the plating assistant tank 1 is heated by the heater 6, so that the iron removal reaction speed can be accelerated after heating, and the iron hydroxide colloid particles can be damaged, generally, the plating assistant solution is industrially selected to be heated to 60-80 ℃, preferably to be heated to 80 ℃, the reaction speed is higher when the heating temperature is high, and the reaction balance is favorably moved towards the direction of an iron hydroxide product;
step three: adding an oxidant and a flocculating agent into the plating assistant solution, wherein the oxidant can be selected from a plurality of types, such as hydrogen peroxide, potassium chlorate, sodium chlorate, calcium hypochlorite, sodium hypochlorite, potassium permanganate and the like, and stirring uniformly by using a stirrer 11 after adding the oxidant and the flocculating agent to ensure that the oxidant and the flocculating agent react with the plating assistant solution fully; wherein, the oxidant is generally 30% hydrogen peroxide aqueous solution, because it is cheaper and purer than other oxidants, and is suitable for industrial production, and the reaction equation of the oxidant and ferrous ions can be combined and expressed as 2FeCl2+H2O2+4NH3·H2O＝2Fe(OH)3↓+4NH4Cl; the flocculating agent can use cationic flocculating agent polyacrylamide (namely cationic PAM), the ionic degree can be selected to be 40%, the cationic PAM can effectively reduce the sludge specific resistance of ferric hydroxide colloid, the double electric layers of ferric hydroxide colloid particles are effectively and rapidly compressed, the colloid particles are adsorbed and bridged, the colloid particles are unstable and damaged, and the ferric hydroxide colloid particles are not easy to adhere to a filtering device to block filtering holes;
step four: the first acid pump 2 is utilized to convey the plating assistant solution to a
step five: all effluents of the
step six: the clear liquid is conveyed back to the plating assistant tank 1 through a second acid pump 5, and at the moment, the plating assistant tank 1 is the plating assistant liquid after iron removal.
If the content of ferrous ions needs to be controlled in a lower range, for example, less than 0.5g/L, the steps three to six can be repeated, wherein the required amount of the oxidizing agent can be calculated according to the amount of the residual ferrous ions in the plating assistant solution before the step three is repeated, the residual amount of the ferrous ions can be obtained by using a PLe electric potential controller and the like, or excessive oxidizing agent can be directly added, the number of times of repeating the steps three to six can be determined according to actual needs, generally can be repeated for 3 to 5 times, and is specifically determined according to actual conditions such as the plating assistant solution amount, the plating assistant solution use time, the iron removal interval time and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
The present invention is not described in detail, but is known to those skilled in the art.
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