CN107244824A - A kind of high whiteness sheet material sand production technology - Google Patents
A kind of high whiteness sheet material sand production technology Download PDFInfo
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- CN107244824A CN107244824A CN201710493628.3A CN201710493628A CN107244824A CN 107244824 A CN107244824 A CN 107244824A CN 201710493628 A CN201710493628 A CN 201710493628A CN 107244824 A CN107244824 A CN 107244824A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
- C04B14/068—Specific natural sands, e.g. sea -, beach -, dune - or desert sand
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Detergent Compositions (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention provides a kind of high whiteness sheet material sand production technology, it is related to quartz sand production technical field；Cobblestone is ground into by rough sheet material sand by broken and ball milling first, then cleaning removes the impurity and surface impurity inside sheet material sand by pickling twice and twice, high whiteness sheet material sand is finally finally made using stoving process；Sheet material sand prepared by the present invention has high whiteness, and more than the peak demand on existing market, great role is played in the extensive use to sheet material sand.
Description
Technical field
The present invention relates to quartz sand production technical field, and in particular to a kind of high whiteness sheet material sand production technology.
Background technology
Quartzy sheet material have scrape it is do not colored, pollution-free, with it is not old, fire do not look for, it is nontoxic radiationless the features such as, increasingly got home
The welcome in decoration market is occupied, quartzy sheet material has higher requirement to the whiteness of the quartz sand as aggregate, in the market dialogue
Degree is without unified standard, and general to require it is to reach more than 90%, minority requires to reach 95%, at this stage, is used as sheet material
The quartzy general vein quartz and Quartz sand for being derived from high-quality, obtains sheet material by techniques such as simply broken, screening and magnetic separation and uses
Sand, and the whiteness research to sheet material sand is very few, and the sheet material sand of high whiteness how is made, and is the emphasis of sheet material sand application.
The content of the invention
(1) technical problem solved
In view of the shortcomings of the prior art, the invention provides a kind of high whiteness sheet material sand production technology so that sheet material sand
Whiteness is greatly improved, and is more widely applied.
(2) technical scheme
To realize object above, the present invention is achieved by the following technical programs：
A kind of high whiteness sheet material sand production technology, comprises the following steps：
(1) primary breakup：Cobblestone is subjected to preliminary crush with cobblestone disintegrating machine and obtains cobblestone fines；
(2) ball milling：Wet ball grinding is carried out to the cobblestone after broken using wet ball mill, rough sheet material sand is obtained；Its
In, grinding aid is from the mixture of water and ethanol, and the ratio of water and ethanol is 3:1, abrading-ball selects stainless steel ball, and cobblestone is thin
The mass ratio of material, abrading-ball and grinding aid is 1：(1.6-2.2)：(1-1.4)；
(3) pickling：Rough sheet material sand is placed in acid solution I and carries out ultrasonic pickling, the compound method of the acid solution I
For：According to volume ratio it is 1 by commercially available hydrochloric acid and water:5 proportions add nitre into dilute hydrochloric acid solution into dilute hydrochloric acid solution
The volume ratio of acid, watery hydrochloric acid and nitric acid is 10:1, add benzoic acid in most backward solution, the volume ratio of watery hydrochloric acid and benzoic acid is
30:1, after being well mixed, container is sealed with preservative film, is put into 55-60 DEG C of baking oven and is incubated 20-30min, the acid solution is made
Ⅰ；
(4) once clean：Rough sheet material sand after step (3) pickling is cleaned with 50-55 DEG C of clear water；
(5) white picking：Rough sheet material sand after step (4) is cleaned, which is put into acid solution II, is cleaned by ultrasonic 3-4h, described
The compound method of acid solution II is：Sulfuric acid is slowly added into deionized water, stirring while adding, the volume of sulfuric acid and deionized water
For 50:1, sulfuric acid solution is configured to, is 20 by volume ratio：13：3：5 oxalic acid, hydrochloric acid, citric acid and butanedioic acid is at 30-35 DEG C
Stirred in water bath uniformly obtains mixed solution, by the mixed solution and sulfuric acid solution with 1:1 volume ratio is well mixed, and acid is made
Liquid II；
(6) secondary cleaning：Sheet material sand after step (5) pickling is cleaned with 50-55 DEG C of deionized water；
(7) dry：Sheet material sand after step (6) is cleaned is put into dryer dries 90- under the conditions of 110-120 DEG C
120min, is then warming up to 550-600 DEG C and continues to dry 3-4h, cool naturally；
(8) sieve：According to actual needs, sheet material sand step (7) obtained crosses 40-60 mesh sieves, and the high whiteness is made
Sheet material sand.
It is preferred that, rotational speed of ball-mill is 600-700r/min in the step (2), and Ball-milling Time is 60-90min.
It is preferred that, described (3) pickling temperatures of step are 60-65 DEG C, and the time is 20-30min.
It is preferred that, step (5) the white picking temperature is 40-55 DEG C.
(3) beneficial effect
The invention provides a kind of high whiteness sheet material sand production technology, by doing raw material from cobblestone, it can save into
This, is made rough sheet material sand, mechanical milling process uses wet ball grinding first by primary breakup and ball milling, can not only improve ball milling effect
Rate, and it is small to instrument and raw material nocuity；Acid cleaning process is effectively removed miscellaneous inside cobblestone using ultrasonic pickling twice
Matter, especially with the impurity of color, makees topmost contribution, superhigh temperature stoving process is then into one to improve quartz sand whiteness
Step improves the whiteness of quartz sand, before not drying, although acid cleaning process can dissolve the impurity of color and luster, but during washing often
It is difficult completely to rinse this partial impurities well, minimal amount of impurity is attached to quartz sand surface, influences the whiteness of quartz sand, and
Drying can remove the impurity of attachment completely, so as to improve quartz sand whiteness.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention,
Technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is the present invention one
Divide embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making
The every other embodiment obtained under the premise of creative work, belongs to the scope of protection of the invention.
Embodiment 1：
A kind of high whiteness sheet material sand production technology, comprises the following steps：
(1) primary breakup：Cobblestone is subjected to preliminary crush with cobblestone disintegrating machine and obtains cobblestone fines；
(2) ball milling：Wet ball grinding is carried out to the cobblestone after broken using wet ball mill, rough sheet material sand is obtained；Its
In, grinding aid is from the mixture of water and ethanol, and the ratio of water and ethanol is 3:1, abrading-ball selects stainless steel ball, and cobblestone is thin
The mass ratio of material, abrading-ball and grinding aid is 1：1.6：1.2；
(3) pickling：Rough sheet material sand is placed in acid solution I and carries out ultrasonic pickling, the compound method of the acid solution I
For：According to volume ratio it is 1 by commercially available hydrochloric acid and water:5 proportions add nitre into dilute hydrochloric acid solution into dilute hydrochloric acid solution
The volume ratio of acid, watery hydrochloric acid and nitric acid is 10:1, add benzoic acid in most backward solution, the volume ratio of watery hydrochloric acid and benzoic acid is
30:1, after being well mixed, container is sealed with preservative film, is put into 55 DEG C of baking ovens and is incubated 30min, the acid solution I is made；
(4) once clean：Rough sheet material sand after step (3) pickling is cleaned with 50 DEG C of clear water；
(5) white picking：Rough sheet material sand after step (4) is cleaned, which is put into acid solution II, is cleaned by ultrasonic 4h, the acid
The compound method of liquid II is：Sulfuric acid is slowly added into deionized water, stirring while adding, the volume of sulfuric acid and deionized water is
50:1, sulfuric acid solution is configured to, is 20 by volume ratio：13：3：5 oxalic acid, hydrochloric acid, citric acid and butanedioic acid is in 30 DEG C of water-baths
Mixed solution is uniformly mixing to obtain, by the mixed solution and sulfuric acid solution with 1:1 volume ratio is well mixed, and acid solution II is made；
(6) secondary cleaning：Sheet material sand after step (5) pickling is cleaned with 55 DEG C of deionized waters；
(7) dry：Sheet material sand after step (6) is cleaned is put into dryer dries 120min under the conditions of 110 DEG C, so
After be warming up to 550 DEG C continue dry 3h, cool naturally；
(8) sieve：According to actual needs, sheet material sand step (7) obtained crosses 40 mesh sieves, and the high whiteness sheet material is made
Sand.
Rotational speed of ball-mill is 650r/min in the step (2), and Ball-milling Time is 70min.
Described (3) pickling temperatures of step are 60 DEG C, and the time is 20min.
Step (5) the white picking temperature is 55 DEG C.
Embodiment 2：
A kind of high whiteness sheet material sand production technology, comprises the following steps：
(1) primary breakup：Cobblestone is subjected to preliminary crush with cobblestone disintegrating machine and obtains cobblestone fines；
(2) ball milling：Wet ball grinding is carried out to the cobblestone after broken using wet ball mill, rough sheet material sand is obtained；Its
In, grinding aid is from the mixture of water and ethanol, and the ratio of water and ethanol is 3:1, abrading-ball selects stainless steel ball, and cobblestone is thin
The mass ratio of material, abrading-ball and grinding aid is 1：1.8：1.4；
(3) pickling：Rough sheet material sand is placed in acid solution I and carries out ultrasonic pickling, the compound method of the acid solution I
For：According to volume ratio it is 1 by commercially available hydrochloric acid and water:5 proportions add nitre into dilute hydrochloric acid solution into dilute hydrochloric acid solution
The volume ratio of acid, watery hydrochloric acid and nitric acid is 10:1, add benzoic acid in most backward solution, the volume ratio of watery hydrochloric acid and benzoic acid is
30:1, after being well mixed, container is sealed with preservative film, is put into 60 DEG C of baking ovens and is incubated 20min, the acid solution I is made；
(4) once clean：Rough sheet material sand after step (3) pickling is cleaned with 55 DEG C of clear water；
(5) white picking：Rough sheet material sand after step (4) is cleaned, which is put into acid solution II, is cleaned by ultrasonic 3h, the acid
The compound method of liquid II is：Sulfuric acid is slowly added into deionized water, stirring while adding, the volume of sulfuric acid and deionized water is
50:1, sulfuric acid solution is configured to, is 20 by volume ratio：13：3：5 oxalic acid, hydrochloric acid, citric acid and butanedioic acid is in 35 DEG C of water-baths
Mixed solution is uniformly mixing to obtain, by the mixed solution and sulfuric acid solution with 1:1 volume ratio is well mixed, and acid solution II is made；
(6) secondary cleaning：Sheet material sand after step (5) pickling is cleaned with 50 DEG C of deionized waters；
(7) dry：Sheet material sand after step (6) is cleaned is put into dryer dries 110min under the conditions of 115 DEG C, so
After be warming up to 570 DEG C continue dry 3h, cool naturally；
(8) sieve：According to actual needs, sheet material sand step (7) obtained crosses 50 mesh sieves, and the high whiteness sheet material is made
Sand.
Rotational speed of ball-mill is 700r/min in the step (2), and Ball-milling Time is 60min.
Described (3) pickling temperatures of step are 65 DEG C, and the time is 25min.
Step (5) the white picking temperature is 50 DEG C.
Embodiment 3：
A kind of high whiteness sheet material sand production technology, comprises the following steps：
(1) primary breakup：Cobblestone is subjected to preliminary crush with cobblestone disintegrating machine and obtains cobblestone fines；
(2) ball milling：Wet ball grinding is carried out to the cobblestone after broken using wet ball mill, rough sheet material sand is obtained；Its
In, grinding aid is from the mixture of water and ethanol, and the ratio of water and ethanol is 3:1, abrading-ball selects stainless steel ball, and cobblestone is thin
The mass ratio of material, abrading-ball and grinding aid is 1：2：1.2；
(3) pickling：Rough sheet material sand is placed in acid solution I and carries out ultrasonic pickling, the compound method of the acid solution I
For：According to volume ratio it is 1 by commercially available hydrochloric acid and water:5 proportions add nitre into dilute hydrochloric acid solution into dilute hydrochloric acid solution
The volume ratio of acid, watery hydrochloric acid and nitric acid is 10:1, add benzoic acid in most backward solution, the volume ratio of watery hydrochloric acid and benzoic acid is
30:1, after being well mixed, container is sealed with preservative film, is put into 55 DEG C of baking ovens and is incubated 30min, the acid solution I is made；
(4) once clean：Rough sheet material sand after step (3) pickling is cleaned with 50 DEG C of clear water；
(5) white picking：Rough sheet material sand after step (4) is cleaned, which is put into acid solution II, is cleaned by ultrasonic 4h, the acid
The compound method of liquid II is：Sulfuric acid is slowly added into deionized water, stirring while adding, the volume of sulfuric acid and deionized water is
50:1, sulfuric acid solution is configured to, is 20 by volume ratio：13：3：5 oxalic acid, hydrochloric acid, citric acid and butanedioic acid is in 30 DEG C of water-baths
Mixed solution is uniformly mixing to obtain, by the mixed solution and sulfuric acid solution with 1:1 volume ratio is well mixed, and acid solution II is made；
(6) secondary cleaning：Sheet material sand after step (5) pickling is cleaned with 55 DEG C of deionized waters；
(7) dry：Sheet material sand after step (6) is cleaned is put into dryer dries 100min under the conditions of 120 DEG C, so
After be warming up to 580 DEG C continue dry 3h, cool naturally；
(8) sieve：According to actual needs, sheet material sand step (7) obtained crosses 60 mesh sieves, and the high whiteness sheet material is made
Sand.
Rotational speed of ball-mill is 650r/min in the step (2), and Ball-milling Time is 80min.
Described (3) pickling temperatures of step are 62 DEG C, and the time is 30min.
Step (5) the white picking temperature is 45 DEG C.
Embodiment 4：
A kind of high whiteness sheet material sand production technology, comprises the following steps：
(1) primary breakup：Cobblestone is subjected to preliminary crush with cobblestone disintegrating machine and obtains cobblestone fines；
(2) ball milling：Wet ball grinding is carried out to the cobblestone after broken using wet ball mill, rough sheet material sand is obtained；Its
In, grinding aid is from the mixture of water and ethanol, and the ratio of water and ethanol is 3:1, abrading-ball selects stainless steel ball, and cobblestone is thin
The mass ratio of material, abrading-ball and grinding aid is 1：2.2：1；
(3) pickling：Rough sheet material sand is placed in acid solution I and carries out ultrasonic pickling, the compound method of the acid solution I
For：According to volume ratio it is 1 by commercially available hydrochloric acid and water:5 proportions add nitre into dilute hydrochloric acid solution into dilute hydrochloric acid solution
The volume ratio of acid, watery hydrochloric acid and nitric acid is 10:1, add benzoic acid in most backward solution, the volume ratio of watery hydrochloric acid and benzoic acid is
30:1, after being well mixed, container is sealed with preservative film, is put into 60 DEG C of baking ovens and is incubated 20min, the acid solution I is made；
(4) once clean：Rough sheet material sand after step (3) pickling is cleaned with 55 DEG C of clear water；
(5) white picking：Rough sheet material sand after step (4) is cleaned, which is put into acid solution II, is cleaned by ultrasonic 3h, the acid
The compound method of liquid II is：Sulfuric acid is slowly added into deionized water, stirring while adding, the volume of sulfuric acid and deionized water is
50:1, sulfuric acid solution is configured to, is 20 by volume ratio：13：3：5 oxalic acid, hydrochloric acid, citric acid and butanedioic acid is in 35 DEG C of water-baths
Mixed solution is uniformly mixing to obtain, by the mixed solution and sulfuric acid solution with 1:1 volume ratio is well mixed, and acid solution II is made；
(6) secondary cleaning：Sheet material sand after step (5) pickling is cleaned with 50 DEG C of deionized waters；
(7) dry：Sheet material sand after step (6) is cleaned is put into dryer dries 90min under the conditions of 115 DEG C, so
After be warming up to 600 DEG C continue dry 4h, cool naturally；
(8) sieve：According to actual needs, sheet material sand step (7) obtained crosses 40 mesh sieves, and the high whiteness sheet material is made
Sand.
Rotational speed of ball-mill is 600r/min in the step (2), and Ball-milling Time is 90min.
Described (3) pickling temperatures of step are 60 DEG C, and the time is 25min.
Step (5) the white picking temperature is 40 DEG C.
Whiteness test is carried out to sheet material sand made from various embodiments above, it is as a result as follows：
| Existing index | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | |
| Whiteness (%) | 95% | 98% | 97% | 97% | 98% |
As seen from the above table, the sheet material sand that prepared by the present invention has high whiteness, right more than the peak demand on existing market
Great role is played in the extensive use of sheet material sand.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
The present invention is described in detail, it will be understood by those within the art that：It still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic；And these modification or
Replace, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (4)
1. a kind of high whiteness sheet material sand production technology, it is characterised in that comprise the following steps：
(1) primary breakup：Cobblestone is subjected to preliminary crush with cobblestone disintegrating machine and obtains cobblestone fines；
(2) ball milling：Wet ball grinding is carried out to the cobblestone after broken using wet ball mill, rough sheet material sand is obtained；Wherein, help
Grinding agent is from the mixture of water and ethanol, and the ratio of water and ethanol is 3:1, abrading-ball selects stainless steel ball, cobblestone fines, abrading-ball
Mass ratio with grinding aid is 1：(1.6-2.2)：(1-1.4)；
(3) pickling：Rough sheet material sand is placed in acid solution I and carries out ultrasonic pickling, the compound method of the acid solution I is：Will
Commercially available hydrochloric acid and water are 1 according to volume ratio:5 proportions add nitric acid, dilute salt into dilute hydrochloric acid solution into dilute hydrochloric acid solution
The volume ratio of acid and nitric acid is 10:1, add benzoic acid in most backward solution, the volume ratio of watery hydrochloric acid and benzoic acid is 30:1, mix
After closing uniformly, container is sealed with preservative film, is put into 55-60 DEG C of baking oven and is incubated 20-30min, the acid solution I is made；
(4) once clean：Rough sheet material sand after step (3) pickling is cleaned with 50-55 DEG C of clear water；
(5) white picking：Rough sheet material sand after step (4) is cleaned, which is put into acid solution II, is cleaned by ultrasonic 3-4h, the acid solution
II compound method is：Sulfuric acid is slowly added into deionized water, stirring while adding, the volume of sulfuric acid and deionized water is
50:1, sulfuric acid solution is configured to, is 20 by volume ratio：13：3：5 oxalic acid, hydrochloric acid, citric acid and butanedioic acid is in 30-35 DEG C of water
Mixed solution is uniformly mixing to obtain in bath, by the mixed solution and sulfuric acid solution with 1:1 volume ratio is well mixed, and acid solution is made
Ⅱ；
(6) secondary cleaning：Sheet material sand after step (5) pickling is cleaned with 50-55 DEG C of deionized water；
(7) dry：Sheet material sand after step (6) is cleaned is put into dryer dries 90- under the conditions of 110-120 DEG C
120min, is then warming up to 550-600 DEG C and continues to dry 3-4h, cool naturally；
(8) sieve：According to actual needs, sheet material sand step (7) obtained crosses 40-60 mesh sieves, and the high whiteness sheet material is made
Sand.
2. high whiteness sheet material sand production technology as claimed in claim 1, it is characterised in that rotational speed of ball-mill in the step (2)
For 600-700r/min, Ball-milling Time is 60-90min.
3. high whiteness sheet material sand production technology as claimed in claim 1, it is characterised in that described (3) pickling temperature of step
Spend for 60-65 DEG C, the time is 20-30min.
4. high whiteness sheet material sand production technology as claimed in claim 1, it is characterised in that step (5) the white picking temperature
Spend for 40-55 DEG C.
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| CN201710493628.3A CN107244824A (en) | 2017-06-26 | 2017-06-26 | A kind of high whiteness sheet material sand production technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710493628.3A CN107244824A (en) | 2017-06-26 | 2017-06-26 | A kind of high whiteness sheet material sand production technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108557778A (en) * | 2018-06-04 | 2018-09-21 | 合肥师范学院 | A kind of method of acid solution and the dissolving iron nail using it |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101186455A (en) * | 2007-12-17 | 2008-05-28 | 段其九 | Preparation method of quartz sand used for quartz crucible |
| CN103896285A (en) * | 2014-04-21 | 2014-07-02 | 江苏凯达石英有限公司 | Method for preparing high-purity superfine quartz powder through waste quartz crucible |
| CN104925823A (en) * | 2015-06-08 | 2015-09-23 | 田晋丞 | Process for refining hematite type potassium feldspar sand powder |
-
2017
- 2017-06-26 CN CN201710493628.3A patent/CN107244824A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101186455A (en) * | 2007-12-17 | 2008-05-28 | 段其九 | Preparation method of quartz sand used for quartz crucible |
| CN103896285A (en) * | 2014-04-21 | 2014-07-02 | 江苏凯达石英有限公司 | Method for preparing high-purity superfine quartz powder through waste quartz crucible |
| CN104925823A (en) * | 2015-06-08 | 2015-09-23 | 田晋丞 | Process for refining hematite type potassium feldspar sand powder |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108557778A (en) * | 2018-06-04 | 2018-09-21 | 合肥师范学院 | A kind of method of acid solution and the dissolving iron nail using it |
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