CN102020286B - Acid-free kaolin bleaching process method - Google Patents
Acid-free kaolin bleaching process method Download PDFInfo
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- CN102020286B CN102020286B CN2010105402830A CN201010540283A CN102020286B CN 102020286 B CN102020286 B CN 102020286B CN 2010105402830 A CN2010105402830 A CN 2010105402830A CN 201010540283 A CN201010540283 A CN 201010540283A CN 102020286 B CN102020286 B CN 102020286B
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- kaolin
- ore pulp
- bleaching
- slurry
- kaolin ore
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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 through filtering, wash, dewatering with Fe
2+Remove.But,, meet water hydrolysis promptly take place because vat powder is very unstable; 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 in weakly alkaline kaolin ore pulp, to add reductive agent---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, pass through filter dehydration again 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 that " after the kaolin ore pulp after the classification and vat powder are mixed, leave standstill, add regulator then; make pulp PH value be controlled at 3～5, stirring promptly gets.Wherein, regulator 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 regulator 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 under acidic conditions just relatively stablely, 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, wash so need add water; Unnecessary sulfuric acid, vitriol etc. are rinsed out, certainly will cause the increase of production cost so again, and kaolinic particle diameter is thinner; The flushing back is also comparatively difficult to the dewatering process of kaolin product; Not only increase process step, and directly increased production cost, be unfavorable for the permanent development of kaolin processing industry.
Therefore,, a kind of kaolinic anacidity bleaching process is provided, kaolin process for processing industry and social environment all are significant to the deficiency of 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.
The object of the invention is realized through following technical scheme:
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; IX: the ore pulp of kaolin described in the step 2 second slurry is placed in the IX whipping appts; Add the solid ion exchanger, slowly stir, through the Fe in ion in the solid ion exchanger and said kaolin ore pulp second slurry behind abundant bleaching action
2+Carry out IX, 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 said kaolin ore pulp the 3rd slurry
2+The solid ion exchanger separate the kaolin ore pulp after obtaining separating.
Wherein, in the said step 3, the solid ion exchanger of said adding is a Zeo-karb.
Wherein, said Zeo-karb is a strongly acidic cationic exchange resin.
Wherein, said strongly acidic cationic exchange resin is for having sulfonic strongly acidic cationic exchange resin.
Wherein, In the said step 1; The add-on of said vat powder is: with concentration is the kaolin ore pulp calculating of 10～15 ﹪, 0.8～1.5Kg vat powder/
kaolin ore pulp.
Wherein, in the said step 2, the time of repose of said static bleaching is 12～24h.
Wherein, in the said step 3, the Fe in the said weakly alkaline kaolin ore pulp in the add-on of said solid ion exchanger and the said step 1
3+Content suitable, perhaps with said step 2 in said kaolin ore pulp second slurry in Fe
2+Content suitable.
Wherein, in the said step 3, the stirring velocity of said slow stirring is 30～80r/min, and the churning time of said slow stirring is 25～50min.
Wherein, in the said step 4, said equipment for separating liquid from solid is a vibratory screening apparatus.
Wherein, after the said step 4, further comprise step 5, absorption Fe
2+The regeneration of solid ion exchanger: with isolated said absorption Fe
2+The solid ion exchanger add regenerative agent, be reduced to the said 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; IX: kaolin ore pulp second slurry in the step 2 is placed in the IX whipping appts; Add the solid ion exchanger, slowly stir, through the Fe in ion in the solid ion exchanger and kaolin ore pulp second slurry behind abundant bleaching action
2+Carry out IX, 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, through IX, 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 is not the residual of acid in the kaolin product; Need not the kaolin product after bleaching through traditional acid bleaching or alkalescence; All washing process to be passed through,, great amount of water resources and the flow process that has shortened kaolin processing can be practiced thrift to reduce the residual acid on the kaolin product;
(2), thereby environmental pollution and environment protection treating expense have been reduced because adding is sour in whole kaolin bleaching process;
(3) because ionite can be regenerated, realize reusing, can practice thrift the production cost of kaolin production industry greatly.
Embodiment
In conjunction with 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; IX places kaolin ore pulp second slurry in the step 2 in the IX whipping appts, adds the solid ion exchanger; Slowly stir, through the Fe in ion in the solid ion exchanger and kaolin ore pulp second slurry behind abundant bleaching action
2+Carry out IX, obtain kaolin ore pulp the 3rd slurry.The method of IX is ion and a kind of reversible chemical reaction that interionic carried out in the solid phase in the liquid phase; When some ion in liquid phase when comparatively the IX solid is liked; Just can be by the solid absorption in the solid ion exchanger; In order to keep the electroneutral of the aqueous solution, the solid ion exchanger must disengage ion of equal value and return in the solution, thus ion in the completion 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/
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 the churning time that slowly 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 characteristic 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 IX, and kaolin ore pulp second slurry in the step 2 is placed in the whipping appts, adds Zeo-karb; Slowly stir, through the ion of Zeo-karb and the Fe in kaolin ore pulp second slurry behind abundant bleaching action
2+Carry out IX, 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 strongly acidic cationic exchange resin.
Concrete, strongly acidic cationic exchange resin can adopt has sulfonic group (strongly acidic cationic exchange resin SO3H).(strongly acidic cationic exchange resin SO3H) dissociates out in solution
easily, so be strongly-acid owing to have sulfonic group.After treating the resin disassociation, the negative electricity group that body is contained like SO3-, can adsorb other positively charged ions in the binding soln.These two reactions are intercoursed H+ and the positively charged ion in the solution in the resin.Can select Se Kesai to think highly acidic resin in concrete the use, the dissociating power of this resin is very strong, in acidity or basic soln, all can dissociate and produce the effect of IX.
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 characteristic 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 ionite 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 characteristic 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; This moment, resin was emitted the positively charged ion that is adsorbed; Combine with
again 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 explain technical scheme of the present invention; But not to the restriction of protection domain of the present invention, although with reference to preferred embodiment the present invention has been done explanation at length, 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 scheme of the present invention.
Claims (8)
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; IX: the ore pulp of kaolin described in the step 2 second slurry is placed in the IX whipping appts; Add the solid ion exchanger, slowly stir, through the Fe in ion in the solid ion exchanger and said kaolin ore pulp second slurry behind abundant bleaching action
2+Carry out IX, obtain kaolin ore pulp the 3rd slurry; In the said step 3, the Fe in the said weakly alkaline kaolin ore pulp in the add-on of said solid ion exchanger and the said step 1
3+Content suitable, perhaps with said step 2 in said kaolin ore pulp second slurry in Fe
2+Content suitable;
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 said kaolin ore pulp the 3rd slurry
2+The solid ion exchanger separate the kaolin ore pulp after obtaining separating;
Step 5, absorption Fe
2+The regeneration of solid ion exchanger: with isolated said absorption Fe
2+The solid ion exchanger add regenerative agent, be reduced to the said solid ion exchanger in the step 3.
2. kaolin anacidity bleaching process method according to claim 1 is characterized in that: in the said step 3, the solid ion exchanger of said adding is a Zeo-karb.
3. kaolin anacidity bleaching process method according to claim 2, it is characterized in that: said Zeo-karb is a strongly acidic cationic exchange resin.
4. kaolin anacidity bleaching process method according to claim 3, it is characterized in that: said strongly acidic cationic exchange resin is for having sulfonic strongly acidic cationic exchange resin.
5. kaolin anacidity bleaching process method according to claim 1; It is characterized in that: in the said step 1; The add-on of said vat powder is: with concentration is the kaolin ore pulp calculating of 10～15 ﹪, 0.8～1.5Kg vat powder/
kaolin ore pulp.
6. kaolin anacidity bleaching process method according to claim 1 is characterized in that: in the said step 2, the time of repose of said static bleaching is 12～24h.
7. kaolin anacidity bleaching process method according to claim 1 is characterized in that: in the said step 3, the stirring velocity of said slow stirring is 30～80r/min, and the churning time of said slow stirring is 25～50min.
8. kaolin anacidity bleaching process method according to claim 1 is characterized in that: in the said step 4, said equipment for separating liquid from solid is a vibratory screening apparatus.
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| Application Number | Priority Date | Filing Date | Title |
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| 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 CN102020286A (en) | 2011-04-20 |
| CN102020286B true CN102020286B (en) | 2012-06-20 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446339A (en) * | 2014-11-05 | 2015-03-25 | 吴俊荣 | Preparation 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 |
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 |
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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 |
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