CN102492842A - Method and equipment for purifying zinc sulfate solution - Google Patents
Method and equipment for purifying zinc sulfate solution Download PDFInfo
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- CN102492842A CN102492842A CN2011104107714A CN201110410771A CN102492842A CN 102492842 A CN102492842 A CN 102492842A CN 2011104107714 A CN2011104107714 A CN 2011104107714A CN 201110410771 A CN201110410771 A CN 201110410771A CN 102492842 A CN102492842 A CN 102492842A
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Abstract
The invention discloses a method and equipment for purifying a zinc sulfate solution. The method comprises the following steps of: adding zinc powder into the zinc sulfate solution for purifying; and after the zinc powder is added, adjusting the acidity of the zinc sulfate solution, namely a) detecting a BT value of the zinc sulfate solution into which the zinc powder is added; b) adding an acid solution into the zinc sulfate solution according to the BT value in the step of a); and c) repeating the step a) to the step b) until the BT value of the zinc sulfate solution is between 1.2 and 2.0. According to the method, the acidity of the zinc sulfate solution is controlled by detecting the BT value of the zinc sulfate solution to destroy an oxidation film on the outer surface of the added zinc powder, and the generation of high-quality seed crystals is ensured on the basis of reducing the addition amount of the zinc powder and improving the activity of the zinc powder, so that the aims of improving the purification quality and reducing the consumption of the zinc powder are fulfilled.
Description
Technical field
The present invention relates to the zinc metallurgy field, especially relate to a kind of Purification of Zinc Sulfate Solution method and apparatus.
Background technology
At present, in the solution of zinc sulfate scavenging process of zinc hydrometallurgy, adopt zinc powder usually as additive; Zinc powder is in manufacturing and transportation, and part surface can be oxidized because of the contact of outside air, and produce a certain amount of sull; This part sull is wrapped in inside with zinc powder; Had a strong impact on the activity of zinc powder, this has just caused increasing considerably of zinc powder usage quantity in the solution of zinc sulfate scavenging process, has wasted a large amount of zinc resources.
In the prior art; In order to reduce the waste to zinc powder, the normal method that adopts is in the solution of zinc sulfate scavenging process, to add an amount of spent acid regulator solution acidity, with the acidity control of solution within the specific limits; Can destroy this sull effectively; And then the activity of raising zinc powder, the usage quantity of reduction zinc powder reduces cost.
The solution acidity of in the solution of zinc sulfate scavenging process of zinc hydrometallurgy, seldom taking measures to control, acidity control method commonly used also is to weigh through the solution pH value, but following reaction can take place in solution of zinc sulfate in scavenging process:
ZnSO
4+H
2O→Zn
2(OH)
2SO
4+H
+
Can know by above-mentioned reaction formula, solution of zinc sulfate can put in scavenging process acid-respons, the generation basic zinc sulfate, this reaction can cause the rising of solution acidity and the decline of pH value, and above-mentionedly puts the H that acid-respons generates
+Can not react with zinc oxide, this just causes the acidity that the take off data of pH value can not actual response solution, also just can't control the acidity of solution of zinc sulfate effectively, can not destroy the sull on zinc powder surface effectively.
Simultaneously; Basic zinc sulfate is a kind of tiny solid particulate, after the Purification of Zinc Sulfate Solution operation is accomplished, need carry out the press filtration operation and carry out liquid-solid separation; This fine particle is easy to stop up the pore of filter cloth, thereby causes the serious restriction to the press filtration operation; In addition, the purification slag that scavenging process forms need return the purification operation as crystal seed, to reduce the zinc consumption amount of scavenging process; But; If there is a large amount of basic zinc sulfates in system's solution, will be wrapped in crystal seed inside and form non-stable crystal seed structure, the crystal seed of this instability can produce when returning the purification operation and return molten phenomenon; Promptly purify the objectionable constituent pass into solution again in the slag, and then influence depuration quality.This basic zinc sulfate that makes also can produce great harm to purifying operation
Seek and a kind ofly can either reduce the zinc powder usage quantity, the method that can avoid producing excessive basic zinc sulfate again is significant to zinc hydrometallurgy.
Summary of the invention
The object of the invention is to overcome the prior art deficiency, and a kind of usage quantity that can reduce zinc powder is provided, and reduces production costs, and can avoid producing simultaneously the solution of zinc sulfate purifying method and the equipment of excessive basic zinc sulfate again.
For this reason; The method that provides a kind of solution of zinc sulfate to purify in the present invention; Comprise and in solution of zinc sulfate, add the step that zinc powder purifies reaction; After also being included in the adding zinc powder, the step of adjustment solution of zinc sulfate acidity, concrete operations are following a). and detection adds the BT value of the solution of zinc sulfate behind the zinc powder; B). the BT value according to a) middle acquisition adds acidic solution in solution of zinc sulfate; C). repeating step is 1.2-2.0 with the BT value of step b) to solution of zinc sulfate a).
Further, above-mentioned steps a) in the testing method of BT value following: get the solution of zinc sulfate 200-300ml style behind the adding zinc powder, measure 25ml after the filtration; Put into container; Add 25ml zero(ppm) water, splash into 2-4 and drip tropeolin-D, with the sulphuric acid soln titration of 10g/L; Till reddening to color, the milliliter number of employed sulphuric acid soln is the BT value.
Further, the average 1-8 of step of above-mentioned adjustment solution of zinc sulfate acidity hour repeats once.
Further; The above-mentioned zinc powder that in solution of zinc sulfate, adds purifies in the step of reaction and comprises the zinc dust precipitation copper removal at least, removes cobalt, nickel, and removes one of purifying step of cadmium; In the process of above-mentioned arbitrary purifying step, the BT value of all adjusting solution of zinc sulfate is 1.2-2.0.
Further, above-mentioned copper removal removes cobalt, nickel, or removes in the step of cadmium and further comprise: the scheduled time repeatedly adds the process of zinc powder at interval, and add zinc powder all to adjust the BT value of said solution of zinc sulfate be 1.2-2.0 at every turn.
Further, above-mentioned solution of zinc sulfate purifying method adopts arsenic the salt method of purification, the antimonic salt method of purification or the xanthate method of purification.
Simultaneously, a kind of equipment that above-mentioned solution of zinc sulfate purifies reaction method of using is provided also in the present invention, has comprised: treating pond; Add sour device, link to each other with treating pond.
Further, above-mentionedly add sour device and comprise: the acid solution storage tank links to each other with treating pond; Flow control assembly is arranged on acid solution storage tank and the stream that treating pond links to each other.
Further, above-mentioned flow control assembly comprises: variable valve is arranged on acid solution storage tank and the stream that treating pond links to each other; Under meter is arranged on acid solution storage tank and the stream that treating pond links to each other, between variable valve and treating pond.
Further, above-mentionedly add sour device and also comprise system, system comprises: induction module, link to each other with under meter, and send flow signal according to the take off data of under meter; Control module links to each other with variable valve, receives flow signal, regulates variable valve according to flow signal.
Further, above-mentioned treating pond comprises the copper removal treating pond that connects according to reaction sequence at least, removes cobalt, nickel treating pond, and removes one of cadmium treating pond; Add sour device and be one or more, respectively with the copper removal treating pond, remove cobalt, nickel treating pond, and it is continuous to remove the cadmium treating pond.
Further, above-mentioned copper removal treating pond removes cobalt, nickel treating pond, perhaps removes to comprise a plurality of sub-treating pond that links to each other in regular turn in the cadmium treating pond respectively, adds sour device and links to each other with each sub-treating pond respectively.
Beneficial effect of the present invention: the method that solution of zinc sulfate provided by the present invention purifies is controlled the acidity of solution of zinc sulfate through the BT value that detects solution of zinc sulfate; And then the sull of zinc powder outside surface that destruction adds, to reduce the input amount of zinc powder, improve zinc powder activity; To guarantee the generation of high-quality crystal seed; Improve depuration quality and reduce the purpose that consumes thereby reach, simultaneously, through the acidity of control solution of zinc sulfate; Control is like the generation of objectionable impuritiess such as basic zinc sulfate and silica gel, to guarantee to purify carrying out smoothly of operation.
Except top described purpose, feature and advantage, the present invention also has other purpose, feature and advantage.Below with reference to accompanying drawings, the present invention is done further detailed explanation.
Description of drawings
Accompanying drawing constitute this specification sheets a part, be used for further understanding the present invention, accompanying drawing shows the preferred embodiments of the present invention, and is used for explaining principle of the present invention with specification sheets.Among the figure:
Fig. 1 shows the structural representation that purifies the equipment of reaction method according to the application of embodiment of the invention solution of zinc sulfate of the present invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiments of the invention is carried out detailed explanation; But following embodiment and accompanying drawing only are in order to understand the present invention; And can not limit the present invention, the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
In a kind of typical embodiment of the present invention; A kind of Purification of Zinc Sulfate Solution method is provided; Comprise and in solution of zinc sulfate, add the step that zinc powder purifies reaction; Also be included in add zinc powder after, the step of adjustment solution of zinc sulfate acidity, the concrete operations of adjustment solution of zinc sulfate acidity are following: a). detect the solution of zinc sulfate that adds behind the zinc powder the BT value; B). in solution of zinc sulfate, add acidic solution according to BT value in a); C). repeating step is 1.2-2.0 with the BT value of step b) to solution of zinc sulfate a).
The method that solution of zinc sulfate provided by the present invention purifies is controlled the acidity of solution of zinc sulfate through the BT value that detects solution of zinc sulfate; And then the sull of zinc powder outside surface that destruction adds, to reduce the input amount of zinc powder, improve zinc powder activity; To guarantee the generation of high-quality crystal seed; Improve depuration quality and reduce the purpose that consumes thereby reach, simultaneously, through the acidity of control solution of zinc sulfate; Control is like the generation of objectionable impuritiess such as basic zinc sulfate and silica gel, to guarantee to purify carrying out smoothly of operation.In addition, employed in the present invention acidic solution can be any spent acid, as long as this spent acid can not introduced the impurity of new not easy-clear in solution of zinc sulfate.Adopt spent acid not only can turn waste into wealth, can also reduce cost.
Preferably, in the present invention provided a kind of above-mentioned steps a) in the testing method of BT value, its concrete operations are following: get the solution of zinc sulfate 200-300ml behind the adding zinc powder; Measure 25ml after the filtration; Put into container, add 25ml zero(ppm) water, splash into 2-4 and drip tropeolin-D.With the sulphuric acid soln titration of 10g/L, till reddening to color, the milliliter number of employed sulphuric acid soln is the BT value.
In the present invention, the testing method of BT value belongs to a kind of residual titration method, and it can measure true potential of hydrogen (the real H in the solution of zinc sulfate of solution of zinc sulfate effectively
+Ionic content), the influence that does not receive solution of zinc sulfate in scavenging process, can put acid-respons.
The principle of the testing method of BT value is: when residual titration, because vitriolic adds, can make the basic zinc sulfate that exists in the solution that following reversed reaction: Zn takes place
2(OH)
2SO
4+ H
+→ ZnSO
4+ H
2O, i.e. the neutralization reaction of basic zinc sulfate, thus eliminate the influence of the pH measurement distortion that the existence owing to basic zinc sulfate causes.
The testing method of this BT value can calculate the add-on of acid solution better; Avoid because of the very few sull that can't destroy zinc surface of acid solution add-on; And the deficiency of increase zinc consumption, and avoid very few because of the acid solution add-on, put acid-respons and make solution of zinc sulfate in scavenging process, understand; And then produce like objectionable impuritiess such as basic zinc sulfate and silica gel, be unfavorable for purifying carrying out smoothly of operation.
Preferably, the average 1-8 of step hour that in Purification of Zinc Sulfate Solution method of the present invention, adjusts solution of zinc sulfate acidity repeats once.More being preferably 4 hours repeats once.The scheduled time repeats to adjust the purification that solution of zinc sulfate acidity can guarantee the continous-stable of solution of zinc sulfate at interval.
Preferably; In Purification of Zinc Sulfate Solution method of the present invention, in solution of zinc sulfate, add the step that zinc powder purifies reaction and comprise the zinc dust precipitation copper removal at least; Remove cobalt, nickel; And remove one of purifying step of cadmium, in the process of above-mentioned arbitrary purifying step, the BT value of all adjusting solution of zinc sulfate is 1.2-2.0.In Purification of Zinc Sulfate Solution method of the present invention, add zinc powder when carrying out replacement(metathesis)reaction, all the BT value of solution of zinc sulfate is adjusted, make it reach 1.2-2.0 at needs.The BT value of adjustment solution of zinc sulfate helps destroying the sull on zinc powder surface, and then reduces the zinc consumption, saves the energy, simultaneously, can reduce solution of zinc sulfate generation like objectionable impuritiess such as basic zinc sulfate and silica gel in scavenging process.
Preferably, above-mentioned copper removal removes cobalt, nickel, or said removing in the step of cadmium further comprises: the scheduled time repeatedly adds the process of zinc powder at interval, all the acidity of solution of zinc sulfate is adjusted after adding zinc powder at every turn, and making its BT value is 1.2-2.0.In the Purification of Zinc Sulfate Solution process; Most modes that zinc powder carries out replacement(metathesis)reaction that add that adopt in removing the process of different impurities; Complete for the zinc powder and the impurity displacement that guarantee to add, understand gradation usually and add zinc powder, progressively carry out replacement(metathesis)reaction; In the present invention; The acidity step of adjustment solution of zinc sulfate is to the solution of zinc sulfate that has added zinc powder, with the sull on destruction zinc powder surface, and reduces solution of zinc sulfate generation like objectionable impuritiess such as basic zinc sulfate and silica gel in scavenging process.So in the Purification of Zinc Sulfate Solution process, add zinc powder at every turn after, all can adopt method provided by the present invention that the acidity of solution of zinc sulfate is adjusted.
Purification of Zinc Sulfate Solution method provided by the present invention can be used with any existing Purification of Zinc Sulfate Solution method jointly, for example the xanthate method of purification, the arsenic salt method of purification, perhaps the antimonic salt method of purification.
As shown in Figure 1, a kind of equipment that above-mentioned solution of zinc sulfate purifies reaction method of using also is provided in the present invention, comprising: treating pond 10 with add sour device 20, add sour device 20 and link to each other with treating pond 10.The interpolation that adds sour device 20 can conveniently add acidic solution in treating pond 10 when adopting above-mentioned solution of zinc sulfate to purify reaction method.
Preferably, above-mentionedly add sour device 20 and comprise acid solution storage tank 21 and flow control assembly 23.Acid solution storage tank 21 links to each other with treating pond; Flow control assembly 23 is arranged on acid solution storage tank 21 and the stream that treating pond 10 links to each other.This simple in structure, make easily, can be just passable through existing solution of zinc sulfate treating plant being carried out simple refit.
Preferably, above-mentioned flow control assembly 23 comprises: variable valve 235 and under meter 231.Variable valve 235 is arranged on acid solution storage tank 21 and the stream that treating pond 10 links to each other; Under meter 231 is arranged on acid solution storage tank 21 and the stream that treating pond 10 links to each other, and between variable valve 235 and treating pond 10.This simple in structure, make easily, and be convenient to influence the flow of acidic solution.The process that purifies at solution of zinc sulfate is the process of a continuous flow, and solution of zinc sulfate and acidic solution flow into according to a certain percentage in the control treating pond, help the BT value of adjustment of acidity solution.
Preferably, above-mentionedly add sour device 20 and also comprise system 25, system 25 comprises: induction module 251 and control module 253.Induction module 251 links to each other with under meter 231, sends flow signal according to the take off data of under meter 231; Control module 253 links to each other with variable valve 235, receives flow signal, regulates variable valve 235 according to flow signal.The installation of system 25 helps controlling the inflow ratio of solution of zinc sulfate and acidic solution in the treating pond, helps the BT value of adjustment of acidity solution.
Preferably, above-mentioned treating pond 10 comprises the copper removal treating pond 11 that connects according to reaction sequence at least, removes cobalt, nickel treating pond 13, and removes one of cadmium treating pond 15; The quantity that adds sour device is identical with the quantity of treating pond, is one or more, respectively with copper removal treating pond 11, removes cobalt, nickel treating pond 13, and it is continuous to remove cadmium treating pond 15.Be provided with a plurality of sour devices that add, help in time in each treating pond, adding acidic solution, with the BT value of regulation and control solution of zinc sulfate.
In a kind of concrete embodiment of the present invention, as shown in Figure 1, the equipment that the above-mentioned solution of zinc sulfate of this application purifies reaction method comprises copper removal treating pond 11 simultaneously; Remove cobalt, nickel treating pond 13; And remove cadmium treating pond 15, adding sour device is 3, respectively at copper removal treating pond 11; Remove cobalt, nickel treating pond 13, and it is continuous to remove cadmium treating pond 15.The copper removal treating pond 11 in the present invention; Remove cobalt, nickel treating pond 13; And to remove cadmium treating pond 15 only be the name to treating pond of the impurity that purifies according to treating pond, according to different purifying methods, like the xanthate method of purification, the arsenic salt method of purification; The perhaps antimonic salt method of purification, treating pond can also be named as copper, cadmium treating pond, copper removal, cadmium, nickel treating pond etc.To those skilled in the art, can reasonably name, and reasonably select deimpurity order treating pond.
Preferably, above-mentioned copper removal treating pond 11 removes cobalt, nickel treating pond 13, perhaps removes to comprise a plurality of sub-treating ponds that link to each other in regular turn in the cadmium treating pond 15 respectively, adds sour device 20 and links to each other with each sub-treating pond respectively.In the solution of zinc sulfate scavenging process, remove in the process of various impurity, add zinc powder for the ease of gradation, be typically provided with a plurality of sub-treating ponds.Add sour device 20 and link to each other with each sub-treating pond respectively, help in time in each sub-treating pond, adding acidic solution, with the BT value of regulation and control solution of zinc sulfate.
In order to further specify beneficial effect of the present invention, below will combine embodiment 1-2 and Comparative Examples 1 to further specify the method that solution of zinc sulfate provided by the present invention purifies.
Embodiment 1
Equipment: comprise 2 copper removals, the cadmium treating pond that link to each other in regular turn, 5 are removed cobalt, nickel treating pond, and 3 are removed cadmium treating pond.Add sour device and comprise 8, respectively with 2 copper removals, cadmium treating pond, preceding 4 remove cobalt, nickel treating pond and preceding 2 and remove cadmium treating pond and link to each other.
Purifying method: adopt the antimonic salt method of purification that solution of zinc sulfate is purified; After adding zinc powder; Respectively add sour device and in each sub-treating pond, add acid solution respectively, control is 1.2 through the BT value that each sub-treating pond purifies the back solution of zinc sulfate, and the zinc powder input amount of entire reaction course is seen table 1.
Embodiment 2
Equipment: comprise 5 copper removals, cadmium, the nickel treating pond that link to each other in regular turn, 6 are removed cadmium treating pond.Add sour device and comprise 10, remove cadmium treating pond with 5 copper removals, cadmium, nickel treating pond, preceding 5 respectively and link to each other.
Purifying method: adopt the arsenic salt method of purification that solution of zinc sulfate is purified; After adding zinc powder; Respectively add sour device and in each sub-treating pond, add acid solution respectively, control is 2.0 through the BT value that each sub-treating pond purifies the back solution of zinc sulfate, and the zinc powder input amount of entire reaction course is seen table 1.
Comparative Examples 1
Equipment: with embodiment 1
Purifying method: with embodiment 1, wherein respectively add sour device and in each sub-treating pond, add acid solution respectively, control is between the 4.5-5.5 through the pH value that each sub-treating pond purifies the back solution of zinc sulfate, and the zinc powder input amount of entire reaction course is seen table 1.
Comparative Examples 2
Equipment: with embodiment 2
Purifying method: with embodiment 2, wherein respectively add sour device and in each sub-treating pond, add acid solution respectively, control is between the 4.5-5.5 through the pH value that each sub-treating pond purifies the back solution of zinc sulfate, and the zinc powder input amount of entire reaction course is seen table 1.
Adopt the method purifying zinc sulfate solution that is provided among embodiment 1-2 and the Comparative Examples 1-2, the input amount of the zinc powder in the scavenging process is listed in the table 1, simultaneously the composition that purifies the resulting solution of zinc sulfate in back is detected, the result is listed in the table 1.
Table 1
Can know by data in the table 1, under identical condition, adopt purifying method provided by the present invention that solution of zinc sulfate is purified, can effectively reduce the usage quantity of zinc powder, reduce production costs.Simultaneously, impurity obviously reduces in the solution of zinc sulfate after purifying method provided by the present invention purifies, and improves depuration quality.
More than be merely the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. Purification of Zinc Sulfate Solution method comprises in solution of zinc sulfate, adding the step that zinc powder purifies reaction, it is characterized in that, also be included in add said zinc powder after, adjust the step of said solution of zinc sulfate acidity, concrete operations are following:
A). detection adds the BT value of the solution of zinc sulfate behind the zinc powder;
B). the BT value according to a) adds acidic solution in solution of zinc sulfate; And
C). repeating step is 1.2-2.0 with the BT value of step b) to solution of zinc sulfate a).
2. method according to claim 1 is characterized in that, the testing method of BT value is following in the step a):
Get the solution of zinc sulfate 200-300ml that adds behind the zinc powder, measure 25ml after the filtration, put into container; Add 25ml zero(ppm) water, splash into 2-4 and drip tropeolin-D, with the sulphuric acid soln titration of 10g/L; Till reddening to color, the milliliter number of employed sulphuric acid soln is the BT value.
3. method according to claim 2 is characterized in that, the average 1-8 of step of said adjustment solution of zinc sulfate acidity hour repeats once.
4. method according to claim 1; It is characterized in that; The said zinc powder that in solution of zinc sulfate, adds purifies in the step of reaction and comprises the zinc dust precipitation copper removal at least, removes cobalt, nickel, and removes one of purifying step of cadmium; In the process of above-mentioned arbitrary purifying step, the BT value of all adjusting solution of zinc sulfate is 1.2-2.0.
5. method according to claim 1 is characterized in that, said copper removal removes cobalt, nickel, or said removing in the step of cadmium further comprises:
At interval the scheduled time repeatedly adds the process of zinc powder, and add said zinc powder all to adjust the BT value of said solution of zinc sulfate be 1.2-2.0 at every turn.
6. according to each described method among the claim 1-5, it is characterized in that said solution of zinc sulfate purifying method adopts arsenic the salt method of purification, the antimonic salt method of purification or the xanthate method of purification.
7. the equipment of each described Purification of Zinc Sulfate Solution method among application such as the claim 1-6 is characterized in that, comprising:
Treating pond (10);
Add sour device (20), link to each other with said treating pond (10).
8. equipment according to claim 7 is characterized in that, the said sour device (20) that adds comprising:
Acid solution storage tank (21) links to each other with said treating pond (10);
Flow control assembly (23) is arranged on said acid solution storage tank (21) and the stream that said treating pond (10) links to each other.
9. equipment according to claim 8 is characterized in that, said flow control assembly (23) comprising:
Variable valve (235) is arranged on said acid solution storage tank (21) and the stream that said treating pond (10) links to each other;
Under meter (231) is arranged on said acid solution storage tank (21) and the stream that said treating pond (10) links to each other, is positioned between said variable valve (235) and the treating pond (10).
10. equipment according to claim 9 is characterized in that, the said sour device (20) that adds also comprises system (25), and said system (25) comprising:
Induction module (251) links to each other with said under meter (231), sends flow signal according to the take off data of said under meter (231);
Control module (253) links to each other with said variable valve (235), receives said flow signal, regulates said variable valve (235) according to said flow signal.
11., it is characterized in that said treating pond (10) comprises the copper removal treating pond (11) that connects according to reaction sequence at least according to each described equipment among the claim 7-10, remove cobalt, nickel treating pond (13), and remove one of cadmium treating pond (15); The said sour device (20) that adds is one or more, respectively with said copper removal treating pond, removes cobalt, nickel treating pond, and the said cadmium treating pond that removes links to each other.
12. equipment according to claim 11; It is characterized in that said copper removal treating pond (11) removes cobalt, nickel treating pond (13); Perhaps said removing comprises a plurality of sub-treating ponds that link to each other in regular turn respectively in the cadmium treating pond (15), the said sour device (20) that adds links to each other with each sub-treating pond respectively.
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| WO2017193724A1 (en) * | 2016-05-10 | 2017-11-16 | 中国恩菲工程技术有限公司 | System and method for treating copper-containing solution |
| CN111257501A (en) * | 2020-01-20 | 2020-06-09 | 昆明瀚创科技有限公司 | Method for measuring concentration of hydroxyl in zinc sulfate solution |
| WO2021147814A1 (en) * | 2020-01-20 | 2021-07-29 | 昆明瀚创科技有限公司 | Method for measuring hydroxide concentration in zinc sulfate solution |
| CN113621798A (en) * | 2021-08-23 | 2021-11-09 | 广西埃索凯循环科技有限公司 | Zinc sulfate purification system based on high temperature high pressure zinc powder |
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