CN105540600B - A kind of catalytic cracking catalyst production technology of low quartz content - Google Patents
A kind of catalytic cracking catalyst production technology of low quartz content Download PDFInfo
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- C01B33/00—Silicon; Compounds thereof
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- C01B33/26—Aluminium-containing silicates, i.e. silico-aluminates
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Abstract
The present invention relates to catalytic cracking catalyst technical field of kaolin, and in particular to a kind of catalytic cracking catalyst production technology of low quartz content, it includes the following steps：Step 1, dispersed kaolin raw ore；Step 2, classification；Step 3, sedimentation；Step 4, filter-press dehydration；It may also include：Step 5, it is dry；Step 6 crushes；Between step 3 and step 4, step A is may also include, is bleached.The catalytic cracking catalyst production technology of the low quartz content is not only able to the content of control quartz 3.6% hereinafter, and can control the content of quartz below 1.5%.Why the present invention can reduce the kaolinic quartz content of catalytic cracking catalyst of produced low quartz content, this is the result that dispersed kaolin raw ore, the classification of step 2 and the sedimentation of step 3 of step 1 are acted synergistically.
Description
Technical field
The present invention relates to catalytic cracking catalyst technical field of kaolin, and in particular to a kind of catalysis of low quartz content
Cracking catalyst production technology.
Background technology
Worldwide, oil is had become as most important and most important energy sources, and oil in human being's production, life
Refining be one of important technology of petroleum application, catalytic cracking (FCC) technology is then the dominant technology of petroleum refining processing.
In FCC techniques, high performance catalyst is the important means for improving refining efficiency and benefit.
Since the 1970s, the refining catalytic Cracking catalyst that is made using kaolin as major ingredient, it has also become refine China and foreign countries
Oil, the bulk catalyst of petrochemical industry, kaolin as a kind of carrier wherein shared deal up to 30%~50%.In modern skill
In art, in order to reduce cost, it is desirable to reduce molecular sieve dosage increases kaolin dosage, therefore kaolin is shared in the catalyst
Deal also have increased trend, and higher requirement also proposed to kaolinic quality.
Quartz content is the kaolinic important indicator of catalytic cracking catalyst, and quartz content is lower in kaolin,
More there is promotion to the quality of catalytic cracking catalyst.
However, in the prior art, the quartz content in the kaolin of catalytic cracking catalyst is generally more than 3.6%, and
The catalytic cracking catalyst that quartz content is used to be prepared for more than 3.6% kaolin, activity, stability, preventing from heavy metal
Energy, slag oil cracking performance, gasoline selective energy and abrasion resistance, regenerability are poor.
Invention content
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of catalytic cracking catalyst of low quartz content
Use production technology.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of catalytic cracking catalyst production technology of low quartz content is provided, it includes the following steps：
Step 1, dispersed kaolin raw ore：Kaolin raw ore and dispersant are uniformly subjected to dispersion step, is made and divides
Scattered ore pulp, and control the pH value and proportion of the ore pulp of dispersion；
Step 2, classification：The ore pulp disperseed made from step 1 is classified using centrifuge, the ore deposit after being classified
Slurry；
Step 3, sedimentation：Ore pulp after classification is put into settling tank to settle, and during according to environment temperature control settlement
Between, obtain settled slurry；
Step 4, filter-press dehydration：Settled slurry made from step 3 is subjected to filter-press dehydration, filter cake is made, and control filter
The moisture of cake obtains the catalytic cracking catalyst kaolin of low quartz content.
In above-mentioned technical proposal, after the step 4 filter-press dehydration step, step 5 is further included, it is dry：By step 4
Filter cake obtained is dried, and controls certain moisture, and the catalytic cracking catalyst for obtaining low quartz content is high
Ridge soil.
In above-mentioned technical proposal, after the step 5 drying steps, step 6 is further included, is crushed：Step 5 is dried
Filter cake afterwards crushes, and obtains the catalytic cracking catalyst kaolin of low quartz content.
In above-mentioned technical proposal, between the step 3 precipitation step and step 4 filter-press dehydration step, step is further included
A, bleaching：Settled slurry made from step 3 is bleached using bleaching agent, the slurry of bleaching is made, and controls the slurry of bleaching
The content of iron oxide in the pH value of material and the slurry of control bleaching.
In above-mentioned technical proposal, in the step 1 dispersed kaolin raw ore step, the dispersant by weight ratio for 40 ~
60：1~3：0.5 ~ 1.5 waterglass, caustic soda and calgon composition；
The proportion of the waterglass is 38 ~ 45；
In the step 1 dispersed kaolin raw ore step, the pH value for controlling the ore pulp of dispersion is 7.5 ~ 8.5；Control dispersion
Ore pulp proportion be 1.13 ~ 1.15.
In above-mentioned technical proposal, in the classification step of the step 2, after the classification of 90% ~ 98% weight percent
The granularity of ore pulp is 2 μm；
In the step 2 classification step, the centrifuge is horizontal spiral centrifuge.
It is described according to the environment temperature control settlement time in the step 3 precipitation step in above-mentioned technical proposal, specifically
For：When environment temperature is 20 DEG C ~ 50 DEG C, the sedimentation time is 48h ~ 72h；When environment temperature is 0 DEG C ~ 20 DEG C, the sedimentation time
For 50h ~ 85h.
In above-mentioned technical proposal, in the step 4 filter-press dehydration step, the moisture for controlling filter cake is 20% ~ 36%.
In above-mentioned technical proposal, in the step 5 drying steps, by filter cake made from step 4 by drying air-dry into
Row drying, and it is 5% ~ 15% to control moisture, obtains the catalytic cracking catalyst kaolin of low quartz content.
In above-mentioned technical proposal, in the step A blanching steps, control bleaching slurry pH value for 2.6 ~ 3.0 and
The content for controlling iron oxide in the slurry of bleaching is less than 0.8%.
Compared with prior art, advantageous effect is the present invention：
（1）A kind of catalytic cracking catalyst production technology of low quartz content provided by the invention, not only
The content of quartz can be controlled 3.6% hereinafter, and the content of quartz can be controlled 1.5% hereinafter, the present invention why can
Enough kaolinic quartz contents of catalytic cracking catalyst for reducing produced low quartz content, this is that the dispersion of step 1 is high
It is that ridge soil raw ore, the classification of step 2 and the sedimentation of step 3 are acted synergistically as a result, step 1 dispersed kaolin raw ore step
In rapid, if dispersion effect is bad, the coarse granule in kaolin raw ore cannot detach, and quartz can be exceeded, in addition, step 2
Classification and the sedimentation of step 3 are to ensure that the crucial factor that the ore pulp of dispersion is further classified, i.e., it is quartzy can be up to standard it is crucial because
Number.
（2）A kind of catalytic cracking catalyst production technology of low quartz content provided by the invention, step
In one dispersed kaolin raw ore step, the pH value of the ore pulp of dispersion and the effect of proportion is controlled to be respectively：Control the ore pulp of dispersion
PH value be mainly ensure dispersion ore pulp dispersion effect；Controlling the proportion of the ore pulp of dispersion has 2 points of effects：A, if point
The proportion of scattered ore pulp is too small, that is, the ore pulp disperseed is too dilute, and the slurry in the ore pulp of dispersion is very little, is wasted during bleaching production
Industrial chemicals wastes the electricity charge and time during filter-press dehydration, reduces production efficiency, improve production cost；B, if
The proportion of the ore pulp of dispersion is excessive, influences dispersion effect, and dispersion is not enough, and can cause the catalysis of produced low quartz content
Cracking catalyst is exceeded with kaolinic granularity and quartz content.
（3）A kind of catalytic cracking catalyst production technology of low quartz content provided by the invention, step
In three precipitation steps, according to the environment temperature control settlement time, the catalytic cracking for controlling produced low quartz content is urged
Agent is very crucial with kaolinic quartz content, and when environment temperature is 20 DEG C ~ 50 DEG C, the sedimentation time is at least controlled as 48h,
Just can guarantee the catalytic cracking catalyst of produced low quartz content with kaolinic quartz content for 3.6% hereinafter, during sedimentation
Between at least control for 65h, just can guarantee the kaolinic quartz content of catalytic cracking catalyst of produced low quartz content
It is less than 1.5%；
When environment temperature is 0 DEG C ~ 20 DEG C, the sedimentation time is at least controlled as 50h, just can guarantee that produced low quartz contains
The catalytic cracking catalyst of amount with kaolinic quartz content is 3.6% hereinafter, it is 78h that the sedimentation time, which at least controls, just can guarantee
The kaolinic quartz content of the catalytic cracking catalyst of the low quartz content produced is less than 1.5%.
（4）A kind of catalytic cracking catalyst production technology of low quartz content provided by the invention, has
Simple production process, and can be suitable for large-scale production the characteristics of.
Specific embodiment
In order to which technical problem solved by the invention, technical solution and advantageous effect is more clearly understood, below in conjunction with
Embodiment, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to explain
The present invention is not intended to limit the present invention.
Wherein, the proportion of the ore pulp of dispersion that the present invention refers to, the relative density of the ore pulp as disperseed.
Wherein, the relative density of the proportion of waterglass, as waterglass that the present invention refers to.
Embodiment 1.
A kind of catalytic cracking catalyst production technology of low quartz content, it includes the following steps：
Step 1, dispersed kaolin raw ore：Kaolin raw ore and dispersant are uniformly subjected to dispersion step, is made and divides
Scattered ore pulp, and control the pH value and proportion of the ore pulp of dispersion；In the present embodiment, dispersant is 50 by weight ratio：2：1 water glass
Glass, caustic soda and calgon composition；Wherein, the proportion of waterglass is 40；In the present embodiment, the pH value of the ore pulp of dispersion is controlled
It is 8；The proportion for controlling the ore pulp of dispersion is 1.14；
Step 2, classification：The ore pulp disperseed made from step 1 is classified using centrifuge, the ore deposit after being classified
Slurry；The granularity of ore pulp after the classification of 95% weight percent is 2 μm；Wherein, centrifuge is horizontal spiral centrifuge；
Step 3, sedimentation：Ore pulp after classification is put into settling tank to settle, and during according to environment temperature control settlement
Between, obtain settled slurry；In the step, according to the environment temperature control settlement time, specially：When environment temperature is 30 DEG C,
Sedimentation time is 60h；When environment temperature is 10 DEG C, sedimentation time 68h；
Step 4, filter-press dehydration：Settled slurry made from step 3 is subjected to filter-press dehydration, filter cake is made, and control filter
The moisture of cake is 28%, obtains the catalytic cracking catalyst kaolin of low quartz content.
A kind of catalytic cracking catalyst production technology of low quartz content of the present embodiment, what is produced is low
The kaolinic quartz content of the catalytic cracking catalyst of quartz content is 2.0%.
Embodiment 2.
A kind of catalytic cracking catalyst production technology of low quartz content, it includes the following steps：
Step 1, dispersed kaolin raw ore：Kaolin raw ore and dispersant are uniformly subjected to dispersion step, is made and divides
Scattered ore pulp, and control the pH value and proportion of the ore pulp of dispersion；In the present embodiment, dispersant is 40 by weight ratio：1：0.5 water
Glass, caustic soda and calgon composition；Wherein, the proportion of waterglass is 38；Wherein, the pH value for controlling the ore pulp of dispersion is
7.5；The proportion for controlling the ore pulp of dispersion is 1.13；
Step 2, classification：The ore pulp disperseed made from step 1 is classified using centrifuge, the ore deposit after being classified
Slurry；In the present embodiment, the granularity of the ore pulp after the classification of 90% weight percent is 2 μm；Wherein, centrifuge for horizontal spiral from
Scheming；
Step 3, sedimentation：Ore pulp after classification is put into settling tank to settle, and during according to environment temperature control settlement
Between, obtain settled slurry；In the present embodiment, according to the environment temperature control settlement time, specially：When environment temperature is 20 DEG C
When, sedimentation time 48h；When environment temperature is 0 DEG C, sedimentation time 50h；
Step 4, filter-press dehydration：Settled slurry made from step 3 is subjected to filter-press dehydration, filter cake is made, and control filter
The moisture of cake is 20%；
Step 5, it is dry：Filter cake made from step 4 is dried, and control the moisture to be by drying to air-dry
10%, obtain the catalytic cracking catalyst kaolin of low quartz content.
A kind of catalytic cracking catalyst production technology of low quartz content of the present embodiment, what is produced is low
The kaolinic quartz content of the catalytic cracking catalyst of quartz content is 3.5%.
Embodiment 3.
A kind of catalytic cracking catalyst production technology of low quartz content, it includes the following steps：
Step 1, dispersed kaolin raw ore：Kaolin raw ore and dispersant are uniformly subjected to dispersion step, is made and divides
Scattered ore pulp, and control the pH value and proportion of the ore pulp of dispersion；In the present embodiment, dispersant is 60 by weight ratio：3：1.5 water
Glass, caustic soda and calgon composition；Wherein, the proportion of waterglass is 45；Wherein, the pH value for controlling the ore pulp of dispersion is
8.5；The proportion for controlling the ore pulp of dispersion is 1.15；
Step 2, classification：The ore pulp disperseed made from step 1 is classified using centrifuge, the ore deposit after being classified
Slurry；In the present embodiment, the granularity of the ore pulp after the classification of 98% weight percent is 2 μm；Wherein, centrifuge for horizontal spiral from
Scheming；
Step 3, sedimentation：Ore pulp after classification is put into settling tank to settle, and during according to environment temperature control settlement
Between, obtain settled slurry；In the present embodiment, according to the environment temperature control settlement time, specially：When environment temperature is 50 DEG C
When, sedimentation time 72h；When environment temperature is 20 DEG C, sedimentation time 85h；
Step 4, filter-press dehydration：Settled slurry made from step 3 is subjected to filter-press dehydration, filter cake is made, and control filter
The moisture of cake is 36%；
Step 5, it is dry：Filter cake made from step 4 is dried, and control the moisture to be by drying to air-dry
5%；
Step 6 crushes：The dried filter cake of step 5 is crushed, the catalytic cracking for obtaining low quartz content is urged
Agent kaolin.
A kind of catalytic cracking catalyst production technology of low quartz content of the present embodiment, what is produced is low
The kaolinic quartz content of the catalytic cracking catalyst of quartz content is 1.3%.
Embodiment 4.
A kind of catalytic cracking catalyst production technology of low quartz content, it includes the following steps：
Step 1, dispersed kaolin raw ore：Kaolin raw ore and dispersant are uniformly subjected to dispersion step, is made and divides
Scattered ore pulp, and control the pH value and proportion of the ore pulp of dispersion；In the present embodiment, dispersant is 45 by weight ratio：1.5：0.8
Waterglass, caustic soda and calgon composition；Wherein, the proportion of waterglass is 42；Wherein, the pH value for controlling the ore pulp of dispersion is
7.8；The proportion for controlling the ore pulp of dispersion is 1.13；
Step 2, classification：The ore pulp disperseed made from step 1 is classified using centrifuge, the ore deposit after being classified
Slurry；In the present embodiment, the granularity of the ore pulp after the classification of 92% weight percent is 2 μm；Wherein, centrifuge for horizontal spiral from
Scheming；
Step 3, sedimentation：Ore pulp after classification is put into settling tank to settle, and during according to environment temperature control settlement
Between, obtain settled slurry；In the present embodiment, according to the environment temperature control settlement time, specially：When environment temperature is 25 DEG C
When, sedimentation time 55h；When environment temperature is 15 DEG C, sedimentation time 60h；
Step A, bleaching：Settled slurry made from step 3 is bleached using bleaching agent, the slurry of bleaching is made, and
The content of iron oxide is less than 0.8% in the slurry that the pH value for controlling the slurry of bleaching is 2.8 and control is bleached；
Step 4, filter-press dehydration：Settled slurry made from step 3 is subjected to filter-press dehydration, filter cake is made, and control filter
The moisture of cake is 30%；
Step 5, it is dry：Filter cake made from step 4 is dried, and control the moisture to be by drying to air-dry
15%；
Step 6 crushes：The dried filter cake of step 5 is crushed, the catalytic cracking for obtaining low quartz content is urged
Agent kaolin.
A kind of catalytic cracking catalyst production technology of low quartz content of the present embodiment, what is produced is low
The kaolinic quartz content of the catalytic cracking catalyst of quartz content is 3.0%.
Embodiment 5.
A kind of catalytic cracking catalyst production technology of low quartz content, it includes the following steps：
Step 1, dispersed kaolin raw ore：Kaolin raw ore and dispersant are uniformly subjected to dispersion step, is made and divides
Scattered ore pulp, and control the pH value and proportion of the ore pulp of dispersion；In the present embodiment, dispersant is 55 by weight ratio：2.5：1.2
Waterglass, caustic soda and calgon composition；Wherein, the proportion of waterglass is 43；Wherein, the pH value for controlling the ore pulp of dispersion is
8.2；The proportion for controlling the ore pulp of dispersion is 1.14；
Step 2, classification：The ore pulp disperseed made from step 1 is classified using centrifuge, the ore deposit after being classified
Slurry；In the present embodiment, the granularity of the ore pulp after the classification of 97% weight percent is 2 μm；Wherein, centrifuge for horizontal spiral from
Scheming；
Step 3, sedimentation：Ore pulp after classification is put into settling tank to settle, and during according to environment temperature control settlement
Between, obtain settled slurry；In the present embodiment, according to the environment temperature control settlement time, specially：When environment temperature is 35 DEG C
When, sedimentation time 60h；When environment temperature is 10 DEG C, sedimentation time 80h；
Step A, bleaching：Settled slurry made from step 3 is bleached using bleaching agent, the slurry of bleaching is made, and
The content of iron oxide is less than 0.8% in the slurry that the pH value for controlling the slurry of bleaching is 2.6 and control is bleached；
Step 4, filter-press dehydration：Settled slurry made from step 3 is subjected to filter-press dehydration, filter cake is made, and control filter
The moisture of cake is 34%；
Step 5, it is dry：Filter cake made from step 4 is dried, and control the moisture to be by drying to air-dry
12%；
Step 6 crushes：The dried filter cake of step 5 is crushed, the catalytic cracking for obtaining low quartz content is urged
Agent kaolin.
A kind of catalytic cracking catalyst production technology of low quartz content of the present embodiment, what is produced is low
The kaolinic quartz content of the catalytic cracking catalyst of quartz content is 2.5%.
Embodiment 6.
A kind of catalytic cracking catalyst production technology of low quartz content, it includes the following steps：
Step 1, dispersed kaolin raw ore：Kaolin raw ore and dispersant are uniformly subjected to dispersion step, is made and divides
Scattered ore pulp, and control the pH value and proportion of the ore pulp of dispersion；In the present embodiment, dispersant is 58 by weight ratio：2.8：1.3
Waterglass, caustic soda and calgon composition；Wherein, the proportion of waterglass is 43；Wherein, the pH value for controlling the ore pulp of dispersion is
8.2；The proportion for controlling the ore pulp of dispersion is 1.14；
Step 2, classification：The ore pulp disperseed made from step 1 is classified using centrifuge, the ore deposit after being classified
Slurry；In the present embodiment, the granularity of the ore pulp after the classification of 94% weight percent is 2 μm；Wherein, centrifuge for horizontal spiral from
Scheming；
Step 3, sedimentation：Ore pulp after classification is put into settling tank to settle, and during according to environment temperature control settlement
Between, obtain settled slurry；In the present embodiment, according to the environment temperature control settlement time, specially：When environment temperature is 32 DEG C
When, sedimentation time 72h；When environment temperature is 13 DEG C, sedimentation time 83h；
Step A, bleaching：Settled slurry made from step 3 is bleached using bleaching agent, the slurry of bleaching is made, and
The content of iron oxide is less than 0.8% in the slurry that the pH value for controlling the slurry of bleaching is 3.0 and control is bleached；
Step 4, filter-press dehydration：Settled slurry made from step 3 is subjected to filter-press dehydration, filter cake is made, and control filter
The moisture of cake is 34%；
Step 5, it is dry：Filter cake made from step 4 is dried, and control the moisture to be by drying to air-dry
12%；
Step 6 crushes：The dried filter cake of step 5 is crushed, the catalytic cracking for obtaining low quartz content is urged
Agent kaolin.
A kind of catalytic cracking catalyst production technology of low quartz content of the present embodiment, what is produced is low
The kaolinic quartz content of the catalytic cracking catalyst of quartz content is 1.0%.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than the present invention is protected
The limitation of range is protected, although being explained in detail with reference to preferred embodiment to the present invention, those of ordinary skill in the art should
Work as understanding, technical scheme of the present invention can be modified or replaced equivalently, without departing from the reality of technical solution of the present invention
Matter and range.
Claims (9)
1. a kind of catalytic cracking catalyst production technology of low quartz content, it is characterised in that：It includes following
Step：
Step 1, dispersed kaolin raw ore：Kaolin raw ore and dispersant are uniformly subjected to dispersion step, dispersion is made
Ore pulp, and control dispersion ore pulp pH value be 7.5~8.5；The proportion for controlling the ore pulp of dispersion is 1.13~1.15；
Step 2, classification：The ore pulp disperseed made from step 2 is classified using centrifuge, the ore pulp after being classified；
Step 3, sedimentation：Ore pulp after classification is put into settling tank to settle, and according to the environment temperature control settlement time,
Obtain settled slurry；
Step 4, filter-press dehydration：Settled slurry made from step 3 is subjected to filter-press dehydration, filter cake is made, and control filter cake
Moisture obtains the catalytic cracking catalyst kaolin of low quartz content；
It is described according to the environment temperature control settlement time in the step 3 precipitation step, specially：When environment temperature is 20 DEG C
At~50 DEG C, the sedimentation time is 48h~72h；When environment temperature is 0 DEG C~20 DEG C, the sedimentation time is 50h~85h.
2. a kind of catalytic cracking catalyst production technology of low quartz content according to claim 1,
It is characterized in that：After the step 4 filter-press dehydration step, step 5 is further included, it is dry：Filter cake made from step 4 is carried out
It is dry, and certain moisture is controlled, obtain the catalytic cracking catalyst kaolin of low quartz content.
3. a kind of catalytic cracking catalyst production technology of low quartz content according to claim 2,
It is characterized in that：After the step 5 drying steps, step 6 is further included, is crushed：The dried filter cake of step 5 is subjected to powder
It is broken, obtain the catalytic cracking catalyst kaolin of low quartz content.
4. a kind of catalytic cracking catalyst production technology of low quartz content according to claim 2,
It is characterized in that：Between the step 3 precipitation step and step 4 filter-press dehydration step, step A is further included, is bleached：Utilize bleaching
Settled slurry made from step 3 is bleached in agent, and the slurry of bleaching is made, and controls pH value and the control of the slurry of bleaching
Make the content of iron oxide in the slurry of bleaching.
5. a kind of catalytic cracking catalyst production technology of low quartz content according to claim 1,
It is characterized in that：In the step 1 dispersed kaolin raw ore step, it is 40~60 that the dispersant, which includes weight ratio,：1~3：0.5
~1.5 waterglass, caustic soda and calgon；
The proportion of the waterglass is 38~45.
6. a kind of catalytic cracking catalyst production technology of low quartz content according to claim 1,
It is characterized in that：In the classification step of the step 2, the granularity of the ore pulp after the classification of 90%~98% weight percent
It is 2 μm；
In the step 2 classification step, the centrifuge is horizontal spiral centrifuge.
7. a kind of catalytic cracking catalyst production technology of low quartz content according to claim 1,
It is characterized in that：In the step 4 filter-press dehydration step, the moisture for controlling filter cake is 20%~36%.
8. a kind of catalytic cracking catalyst production technology of low quartz content according to claim 2,
It is characterized in that：In the step 5 drying steps, filter cake made from step 4 is dried, and control water by drying to air-dry
It is 5%~15% to divide content, obtains the catalytic cracking catalyst kaolin of low quartz content.
9. a kind of catalytic cracking catalyst production technology of low quartz content according to claim 4,
It is characterized in that：In the step A blanching steps, the pH value for controlling the slurry of bleaching is 2.6~3.0 and the slurry of control bleaching
The content of iron oxide is less than 0.8% in material.
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| CN111689502A (en) * | 2020-06-30 | 2020-09-22 | 茂名市茂群高岭土有限公司 | Kaolin for preparing in-situ crystallization catalyst |
| CN113861726A (en) * | 2021-09-29 | 2021-12-31 | 广东宝丰陶瓷科技发展股份有限公司 | Preparation method for low-grade kaolin composite efficient activation modification |
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| US5128027A (en) * | 1990-06-07 | 1992-07-07 | Naguib Halaka | Method for removing mineral slimes from kaolin clay |
| US5938833A (en) * | 1996-09-18 | 1999-08-17 | Engelhard Corporation | Chemical process for fractionating mineral particles based on particle size |
| CN101798096B (en) * | 2010-04-01 | 2012-07-04 | 茂名市茂群高岭土有限公司 | Method for preparing kaoline |
| CN101863487A (en) * | 2010-05-28 | 2010-10-20 | 茂名石化矿业有限公司 | Production method of superfine kaolin |
| CN201894953U (en) * | 2010-11-09 | 2011-07-13 | 茂名市茂群高岭土有限公司 | Sedimentation device for preparing kaolin |
| CN102092724A (en) * | 2010-11-24 | 2011-06-15 | 湖南宝山高岭土科技开发有限公司 | Production method of modified kaolin |
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