CN102020286A - Acid-free kaolin bleaching process method - Google Patents
Acid-free kaolin bleaching process method Download PDFInfo
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- CN102020286A CN102020286A CN 201010540283 CN201010540283A CN102020286A CN 102020286 A CN102020286 A CN 102020286A CN 201010540283 CN201010540283 CN 201010540283 CN 201010540283 A CN201010540283 A CN 201010540283A CN 102020286 A CN102020286 A CN 102020286A
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- kaolin
- ore pulp
- bleaching
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Abstract
The invention discloses an acid-free kaolin bleaching process method, comprising the following steps of: chemical agent mixing: adding rongalite into desanded and graded alkalescent kaolin ore pulp, stirring and mixing evenly to obtain the first sizing agent of the kaolin ore pulp; static bleaching: putting the first sizing agent of the kaolin ore pulp into a pulp storage device and standing still, fully bleaching and reacting to obtain the second sizing agent of the kaolin ore pulp; ion exchange: putting the second sizing agent of the kaolin ore pulp into an ion exchange dasher, and adding solid exchanger, slowly stirring for ion exchange to obtain the third sizing agent of the kaolin ore pulp; solid-liquid separation: putting the third sizing agent of the kaolin ore pulp into a solid-liquid separation device, separating solid ion exchanger capable of adsorbing Fe2+ in the third sizing agent of the kaolin ore pulp so as to obtain separated kaolin ore pulp. The acid-free kaolin bleaching process method has the characteristics of simple processstrong practicality, low cost and environment friendly, is easy for operation and safe and realizes the purpose of acid-free bleaching.
Description
Technical field
The present invention relates to a kind of kaolinic reduction bleaching Technology, particularly relate to a kind of kaolin anacidity bleaching process method.
Background technology
Kaolin is widely used in industry such as pottery, papermaking, refractory materials, coating, rubber and cable.Kaolinic whiteness is an important indicator that influences its using value and Application Areas, particularly kaolinic whiteness is had relatively high expectations at papermaking, ceramic industry, think the kaolin product that obtains high whiteness, kaolinic bleaching process is a very important technology in the kaolin complete processing.
In the prior art, kaolinic bleaching process adopts the acid bleaching method usually, specifically is to regulate the kaolin ore pulp to acid with sulfuric acid, adds reductive agent then---vat powder (chemical name: sodium hyposulfate, molecular formula: Na
2S
2O
4), the ferric oxide compound that exists in the kaolin ore pulp, water insoluble, also be insoluble in diluted acid, but under the condition that sodium hyposulfate exists, can be with the Fe in the kaolin ore pulp
3+Be reduced to Fe
2+Because Fe
2+Water soluble, stirring reaction for some time, the Fe of band look in the kaolin ore pulp
3+Be reduced to colourless Fe
2+, be combined into water-soluble compound with sulfuric acid, again by filtering, wash, dewatering with Fe
2+Remove.But, because vat powder is very unstable, meet water hydrolysis promptly takes place, and the hydrolysis rate of vat powder accelerates with the reduction of pH value, and the large usage quantity of the acid that in the acid bleaching method, is added, therefore, in acidic medium, the vat powder hydrolysis rate is more a lot of soon than kaolinic bleaching speed, thereby causes the waste of vat powder, and, increased kaolinic production cost thus because the price of vat powder is comparatively expensive.
For addressing the above problem, people have adopted the alkaline static bleaching method that kaolin is bleached again, specifically are to add reductive agent in weakly alkaline kaolin ore pulp---vat powder, leave standstill for some time, and make band look Fe in the kaolin ore pulp
3+Slowly be reduced into colourless Fe
2+, and then add sulfuric acid or compound acid, with Fe
2+Be combined into water-soluble compound, again by filter dehydration with Fe
2+Remove.
For example, (publication number is: CN 101531372A) disclose on September 16th, 2009 a kind of " kaoline alkaline static bleaching technology " in the Chinese invention patent application, its technical scheme comprises " after the kaolin ore pulp after the classification and vat powder are mixed; leave standstill; add conditioning agent then; make pulp PH value be controlled at 3～5, stir promptly.Wherein, conditioning agent is sulfuric acid and oxalic acid or phosphoric acid, is phosphoric acid and anhydrous oxalic acid or the phosphoric acid of 98 ﹪ by concentration, and oxalic acid or phosphoric acid consumption are 15～25 ﹪ of conditioning agent gross weight ".
The technical scheme of above-mentioned Chinese invention patent application, though the consumption of employed acid has reduced in the amount ratio acid bleaching method of employed acid in whole bleaching process, but still need add sulfuric acid or other acid in the whole bleaching process, add the sour quality that has not only influenced kaolin product, and environment is also affected; Simultaneously, because Fe
2+Need guarantee that ability is relatively stable under acidic conditions, be difficult for being oxidized to Fe
3+With this understanding, owing to contain excessive sulfuric acid and vitriol etc. in the kaolin product, can cause the increase of kaoline viscosity, thereby be unfavorable for kaolinic application, so need add water washes, unnecessary sulfuric acid, vitriol etc. are rinsed out, certainly will cause the increase of production cost so again, and kaolinic particle diameter is thinner, and the flushing back is also comparatively difficult to the dewatering process of kaolin product, has not only increased processing step, and directly increased production cost, be unfavorable for the permanent development of kaolin processing industry.
Therefore,, provide a kind of kaolinic anacidity bleaching process, kaolin process for processing industry and social environment all are significant at the deficiencies in the prior art.
Summary of the invention
The objective of the invention is to avoid weak point of the prior art and provide that a kind of technology is simple, easy handling, practical, cost is lower, and the kaolin anacidity bleaching process method of Environmental Safety.
Purpose of the present invention is achieved through the following technical solutions:
A kind of kaolin anacidity bleaching process method is provided, includes following steps:
Step 1 is sneaked into medicament: vat powder is added in the weakly alkaline kaolin ore pulp after desanding, classification, mixes to evenly, obtain kaolin ore pulp first slurry;
Step 2, static bleaching: place storage to leave standstill in the sizing device in the ore pulp of kaolin described in the step 1 first slurry, carry out sufficient bleaching action, obtain kaolin ore pulp second slurry;
Step 3, ion-exchange: the ore pulp of kaolin described in the step 2 second slurry is placed in the ion-exchange whipping appts, add the solid ion exchanger, slowly stir, by the Fe in ion in the solid ion exchanger and described kaolin ore pulp second slurry behind abundant bleaching action
2+Carry out ion-exchange, obtain kaolin ore pulp the 3rd slurry;
Step 4, solid-liquid separation: the ore pulp of kaolin described in the step 3 the 3rd slurry is placed equipment for separating liquid from solid, to the absorption Fe in described kaolin ore pulp the 3rd slurry
2+The solid ion exchanger separate the kaolin ore pulp after obtaining separating.
Wherein, in the described step 3, the solid ion exchanger of described adding is a Zeo-karb.
Wherein, described Zeo-karb is a storng-acid cation exchange resin.
Wherein, described storng-acid cation exchange resin is for having sulfonic storng-acid cation exchange resin.
Wherein, in the described step 1, the add-on of described vat powder is: with concentration is the kaolin ore pulp calculating of 10～15 ﹪, 0.8～1.5Kg vat powder/
The kaolin ore pulp.
Wherein, in the described step 2, the time of repose of described static bleaching is 12～24h.
Wherein, in the described step 3, the Fe in the described weakly alkaline kaolin ore pulp in the add-on of described solid ion exchanger and the described step 1
3+Content suitable, perhaps with described step 2 in described kaolin ore pulp second slurry in Fe
2+Content suitable.
Wherein, in the described step 3, the stirring velocity of described slow stirring is 30～80r/min, and the churning time of described slow stirring is 25～50min.
Wherein, in the described step 4, described equipment for separating liquid from solid is a vibratory screening apparatus.
Wherein, after the described step 4, further comprise step 5, absorption Fe
2+The regeneration of solid ion exchanger: with isolated described absorption Fe
2+The solid ion exchanger add regenerative agent, be reduced to the described solid ion exchanger in the step 3.
Beneficial effect of the present invention: a kind of kaolin anacidity bleaching process method of the present invention, comprise: step 1, sneak into medicament: vat powder is added in the weakly alkaline kaolin ore pulp after desanding, classification, mixes, obtain kaolin ore pulp first slurry to evenly; Step 2, static bleaching: place storage to leave standstill in the sizing device in kaolin ore pulp first slurry in the step 1, carry out sufficient bleaching action, obtain kaolin ore pulp second slurry; Step 3, ion-exchange: kaolin ore pulp second slurry in the step 2 is placed in the ion-exchange whipping appts, add the solid ion exchanger, slowly stir, by the Fe in ion in the solid ion exchanger and kaolin ore pulp second slurry behind abundant bleaching action
2+Carry out ion-exchange, obtain kaolin ore pulp the 3rd slurry; Step 4, solid-liquid separation: kaolin ore pulp the 3rd slurry in the step 3 is placed equipment for separating liquid from solid, to the absorption Fe in kaolin ore pulp the 3rd slurry
2+The solid ion exchanger separate the kaolin ore pulp after obtaining separating.The invention belongs to the alkaline static bleaching technology method, but be different from the alkaline static bleaching technology method that adds acid of the prior art, is a kind of alkaline static bleaching technology method of anacidity, and its substantive distinguishing features is: treat the Fe in the kaolin ore pulp slurry
3+Fully be reduced into Fe
2+After, add the solid ion exchanger, by ion-exchange, with Fe
2+Exchange on the solid ion exchanger, thereby with Fe
2+Remove, thereby realized the purpose of no acid blanching.Compared with prior art, this kaolin anacidity bleaching process method has following characteristics:
(1) owing to do not add acid in the bleaching process, there be not the residual of acid in the kaolin product, need not the kaolin product after bleaching by traditional acid bleaching or alkalescence, all to pass through washing process, to reduce the residual acid on the kaolin product, can save great amount of water resources and shorten the flow process that kaolin is processed;
(2), thereby environmental pollution and environment protection treating expense have been reduced because adding is sour in whole kaolin bleaching process;
(3) because ion-exchanger can be regenerated, realize reusing, can save the production cost of kaolin production industry greatly.
Embodiment
With the following Examples the present invention is further described.
Embodiment 1:
One of embodiment of a kind of kaolin anacidity bleaching process method of the present invention may further comprise the steps:
Step 1 is sneaked into medicament: vat powder is added in the weakly alkaline kaolin ore pulp after desanding, classification, mixes to evenly, obtain kaolin ore pulp first slurry.
Step 2, static bleaching places storage to leave standstill in the sizing device in kaolin ore pulp first slurry in the step 1, carries out sufficient bleaching action, obtains kaolin ore pulp second slurry.Wherein, the storage sizing device is specially pulp storage tank.The principal reaction of the bleaching process of above-mentioned steps is:
The Fe that exists in the kaolin ore pulp
3+Oxide compound, (be sodium hyposulfate Na at vat powder
2S
2O
4) under the condition that exists, stirring reaction is after for some time, makes the Fe of band look in the kaolin
3+Be reduced to Fe
2+
Step 3, ion-exchange places kaolin ore pulp second slurry in the step 2 in the ion-exchange whipping appts, adds the solid ion exchanger, slowly stir, by the Fe in ion in the solid ion exchanger and kaolin ore pulp second slurry behind abundant bleaching action
2+Carry out ion-exchange, obtain kaolin ore pulp the 3rd slurry.The method of ion-exchange is ion in the liquid phase and a kind of reversible chemical reaction that interionic carried out in the solid phase, when some ion in liquid phase when comparatively the ion-exchange solid is liked, just can be by the solid absorption in the solid ion exchanger, in order to keep the electric neutrality of the aqueous solution, the solid ion exchanger must disengage ion of equal value and return in the solution, thereby finishes ion in the liquid phase and the interionic exchange in the solid phase.Normally a kind of insoluble macromolecular compound of this solid ion exchanger.
Step 4, solid-liquid separation: kaolin ore pulp the 3rd slurry in the step 3 is placed equipment for separating liquid from solid, to the absorption Fe in kaolin ore pulp the 3rd slurry
2+The solid ion exchanger separate the kaolin ore pulp after obtaining separating.
Wherein, the add-on of the vat powder in the step 1: with concentration is the kaolin ore pulp calculating of 10～15 ﹪, 0.8～1.5Kg vat powder/
The kaolin ore pulp.
Wherein, the time of repose of static bleaching is 12～24h in the step 2.
Wherein, the Fe in the add-on of the solid ion exchanger in the step 3 and the weakly alkaline kaolin ore pulp in the step 1
3+Content suitable, perhaps with step 2 in kaolin ore pulp second slurry in Fe
2+Content suitable.
Wherein, the stirring velocity of the slow stirring in the step 3 is 30～80r/min, and slowly the churning time that stirs is 25～50min.
Wherein, the equipment for separating liquid from solid in the step 4 is a vibratory screening apparatus.
Embodiment 2:
Two of the embodiment of a kind of kaolin anacidity bleaching process method of the present invention, the main technical schemes of present embodiment is identical with embodiment 1, and unaccounted feature adopts the explanation among the embodiment 1 in the present embodiment, no longer gives unnecessary details at this.The difference of present embodiment and embodiment 1 is that the solid ion exchanger that adds in the step 3 can be Zeo-karb.
Concrete, step 3 is ion-exchange, and kaolin ore pulp second slurry in the step 2 is placed in the whipping appts, adds Zeo-karb, slowly stir, by the ion of Zeo-karb and the Fe in kaolin ore pulp second slurry behind abundant bleaching action
2+Carry out ion-exchange, obtain kaolin ore pulp the 3rd slurry.Adopt Zeo-karb with the Fe in the kaolin ore pulp solution
2+Exchange on the resin cation (R.C.), replaced sour effect, remove Fe
2+, and prevent Fe effectively
2+Be oxidized to Fe
3+, and the phenomenon of the kaolin product " brightness reversion " that occurs, the purpose of the no acid blanching of realization.
Concrete, Zeo-karb can adopt storng-acid cation exchange resin.
Concrete, storng-acid cation exchange resin can adopt has sulfonic group (storng-acid cation exchange resin SO3H).(storng-acid cation exchange resin SO3H) dissociates out in solution easily owing to have sulfonic group
So, be strongly-acid.After treating the resin disassociation, the negative electricity group that body is contained as SO3-, can adsorb other positively charged ions in the binding soln.These two reactions are intercoursed H+ in the resin and the positively charged ion in the solution.Can select Se Kesai to think highly acidic resin in concrete the use, the dissociating power of this resin is very strong, all can dissociate and produce the effect of ion-exchange in acidity or basic solution.
In addition, the solid ion exchanger in the step 3 can also be selected the Mierocrystalline cellulose etc. except that resin, and containing in its molecule can dissociated group, and these groups can play exchange interaction with other positively charged ion in the solution in the aqueous solution.
Embodiment 3:
Three of the embodiment of a kind of kaolin anacidity bleaching process method of the present invention, the main technical schemes of present embodiment is identical with embodiment 1, and unaccounted feature adopts the explanation among the embodiment 1 in the present embodiment, no longer gives unnecessary details at this.The difference of present embodiment and embodiment 1 is, after step 4, further comprises step 5, absorption Fe
2+The regeneration of solid ion exchanger: with isolated absorption Fe
2+The solid ion exchanger add regenerative agent, be reduced to the solid ion exchanger in the step 3.
The solid ion exchanger will carry out manipulation of regeneration in use for some time, promptly with regenerative agent ion exchange reaction is carried out in the opposite direction, makes the functional group of ion-exchanger recover the process of itself and water intermediate ion exchange capacity again, for reusing.
Embodiment 4:
Four of the embodiment of a kind of kaolin anacidity bleaching process method of the present invention, the main technical schemes of present embodiment is identical with embodiment 2, and unaccounted feature adopts the explanation among the embodiment 2 in the present embodiment, no longer gives unnecessary details at this.The difference of present embodiment and embodiment 2 is, after step 4, further comprises step 5, absorption Fe
2+The regeneration of resin cation (R.C.): with isolated absorption Fe
2+Resin cation (R.C.) add regenerative agent, be reduced to the resin cation (R.C.) in the step 3.
Concrete, above-mentioned resin cation (R.C.) can adopt strong acid to carry out manipulation of regeneration, and this moment, resin was emitted the positively charged ion that is adsorbed, again with
In conjunction with and recover original chemical structure so that recycling, save the production cost of production industry.
Should be noted that at last; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although the present invention has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the essence and the scope of technical solution of the present invention.
Claims (10)
1. a kaolin anacidity bleaching process method is characterized in that, includes following steps:
Step 1 is sneaked into medicament: vat powder is added in the weakly alkaline kaolin ore pulp after desanding, classification, mixes to evenly, obtain kaolin ore pulp first slurry;
Step 2, static bleaching: place storage to leave standstill in the sizing device in the ore pulp of kaolin described in the step 1 first slurry, carry out sufficient bleaching action, obtain kaolin ore pulp second slurry;
Step 3, ion-exchange: the ore pulp of kaolin described in the step 2 second slurry is placed in the ion-exchange whipping appts, add the solid ion exchanger, slowly stir, by the Fe in ion in the solid ion exchanger and described kaolin ore pulp second slurry behind abundant bleaching action
2+Carry out ion-exchange, obtain kaolin ore pulp the 3rd slurry;
Step 4, solid-liquid separation: the ore pulp of kaolin described in the step 3 the 3rd slurry is placed equipment for separating liquid from solid, to the absorption Fe in described kaolin ore pulp the 3rd slurry
2+The solid ion exchanger separate the kaolin ore pulp after obtaining separating.
2. kaolin anacidity bleaching process method according to claim 1 is characterized in that: in the described step 3, the solid ion exchanger of described adding is a Zeo-karb.
3. kaolin anacidity bleaching process method according to claim 2, it is characterized in that: described Zeo-karb is a storng-acid cation exchange resin.
4. kaolin anacidity bleaching process method according to claim 3, it is characterized in that: described storng-acid cation exchange resin is for having sulfonic storng-acid cation exchange resin.
5. kaolin anacidity bleaching process method according to claim 1, it is characterized in that: in the described step 1, the add-on of described vat powder is: with concentration is the kaolin ore pulp calculating of 10～15 ﹪, 0.8～1.5Kg vat powder/
The kaolin ore pulp.
6. kaolin anacidity bleaching process method according to claim 1 is characterized in that: in the described step 2, the time of repose of described static bleaching is 12～24h.
7. kaolin anacidity bleaching process method according to claim 1 is characterized in that: in the described step 3, and the Fe in the described weakly alkaline kaolin ore pulp in the add-on of described solid ion exchanger and the described step 1
3+Content suitable, perhaps with described step 2 in described kaolin ore pulp second slurry in Fe
2+Content suitable.
8. kaolin anacidity bleaching process method according to claim 1 is characterized in that: in the described step 3, the stirring velocity of described slow stirring is 30～80r/min, and the churning time of described slow stirring is 25～50min.
9. kaolin anacidity bleaching process method according to claim 1 is characterized in that: in the described step 4, described equipment for separating liquid from solid is a vibratory screening apparatus.
10. kaolin anacidity bleaching process method according to claim 1 is characterized in that: after the described step 4, further comprise step 5, absorption Fe
2+The regeneration of solid ion exchanger: with isolated described absorption Fe
2+The solid ion exchanger add regenerative agent, be reduced to the described solid ion exchanger in the step 3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105402830A CN102020286B (en) | 2010-11-11 | 2010-11-11 | Acid-free kaolin bleaching process method |
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|---|---|---|---|
| CN2010105402830A CN102020286B (en) | 2010-11-11 | 2010-11-11 | Acid-free kaolin bleaching process method |
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| CN102020286A true CN102020286A (en) | 2011-04-20 |
| CN102020286B CN102020286B (en) | 2012-06-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446339A (en) * | 2014-11-05 | 2015-03-25 | 吴俊荣 | Preparation method of kaolin |
| CN105293508A (en) * | 2015-11-20 | 2016-02-03 | 中国高岭土有限公司 | Acid-free bleaching method of kaolin |
| CN108145105A (en) * | 2017-06-27 | 2018-06-12 | 胡毅婧 | A kind of special kaolin of crystallizer protecting residue and its preparation method and application |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101117003A (en) * | 2007-08-24 | 2008-02-06 | 中国地质大学（武汉） | Production technology of paper coating kaoline |
| CN101445249A (en) * | 2008-12-28 | 2009-06-03 | 梁明 | Method for bleaching high-concentration kaolin pulp |
| CN102092754A (en) * | 2010-12-23 | 2011-06-15 | 内蒙古昶泰资源循环再生利用科技开发有限责任公司 | Method for removing impurity iron in aluminum sulfate solution through ion exchange |
-
2010
- 2010-11-11 CN CN2010105402830A patent/CN102020286B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101117003A (en) * | 2007-08-24 | 2008-02-06 | 中国地质大学（武汉） | Production technology of paper coating kaoline |
| CN101445249A (en) * | 2008-12-28 | 2009-06-03 | 梁明 | Method for bleaching high-concentration kaolin pulp |
| CN102092754A (en) * | 2010-12-23 | 2011-06-15 | 内蒙古昶泰资源循环再生利用科技开发有限责任公司 | Method for removing impurity iron in aluminum sulfate solution through ion exchange |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446339A (en) * | 2014-11-05 | 2015-03-25 | 吴俊荣 | Preparation method of kaolin |
| CN105293508A (en) * | 2015-11-20 | 2016-02-03 | 中国高岭土有限公司 | Acid-free bleaching method of kaolin |
| CN105293508B (en) * | 2015-11-20 | 2017-07-07 | 中国高岭土有限公司 | A kind of kaolinic anacidity method for bleaching |
| CN108145105A (en) * | 2017-06-27 | 2018-06-12 | 胡毅婧 | A kind of special kaolin of crystallizer protecting residue and its preparation method and application |
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| Publication number | Publication date |
|---|---|
| CN102020286B (en) | 2012-06-20 |
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