CN107522471A - A kind of Water-permeable inorganic material and preparation method thereof - Google Patents

A kind of Water-permeable inorganic material and preparation method thereof Download PDF

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CN107522471A
CN107522471A CN201710533087.2A CN201710533087A CN107522471A CN 107522471 A CN107522471 A CN 107522471A CN 201710533087 A CN201710533087 A CN 201710533087A CN 107522471 A CN107522471 A CN 107522471A
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water
inorganic material
permeable inorganic
powder
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CN107522471B (en
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张立
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North China University of Water Resources and Electric Power
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Abstract

The present invention discloses a kind of Water-permeable inorganic material and preparation method thereof, is prepared by the raw material of following parts by weight:30 40 parts of gangue, 10 15 parts of flyash, 10 20 parts of quartz sand, 5 10 parts of Suzhou soil, 15 20 parts of modification infusorial earth, 5 10 parts of montmorillonite, 10 30 parts of paraffin, 5 15 parts of potassium titanate crystal whisker, 5 10 parts of swelling perlite powder, 10 15 parts of silicon carbide powder, 5 10 parts of glass fibre, 15 20 parts of hydroxymethyl cellulose, 5 10 parts of thickener, 5 10 parts of dispersant, 30 40 parts of water.Water-permeable inorganic material compression strength provided by the invention is more than 30Mpa, and coefficient of permeability is more than 1.7 × 10‑2 cm/S。

Description

A kind of Water-permeable inorganic material and preparation method thereof
Technical field
The invention belongs to construction engineering technical field, and in particular to a kind of Water-permeable inorganic material and preparation method thereof.
Background technology
Water-permeable inorganic material such as seepage brick, belongs to green building material, because it has good water penetration, extensively Applied to fields such as traffic, bank protections, however, existing Water-permeable inorganic material is present, compression strength is strong, infiltration coefficient compared with The problem of small, its application is by certain restriction.
The content of the invention
The purpose of the present invention is that provides that a kind of intensity is larger, infiltration coefficient is higher to solve the deficiencies in the prior art Water-permeable inorganic material and preparation method thereof.
The purpose of the present invention is realized with following technical proposals:
A kind of Water-permeable inorganic material, it is prepared by the raw material of following parts by weight:Gangue 30-40 parts, flyash 10-15 parts, Quartz sand 10-20 parts, Suzhou soil 5-10 parts, modification infusorial earth 15-20 parts, montmorillonite 5-10 parts, paraffin 10-30 parts, potassium titanate Whisker 5-15 parts, swelling perlite powder 5-10 parts, silicon carbide powder 10-15 parts, glass fibre 5-10 parts, hydroxymethyl cellulose 15-20 parts, thickener 5-10 parts, dispersant 5-10 parts, water 30-40 parts.
The modification infusorial earth is prepared by the raw material of following parts by weight:Diatomite powder 15-20 parts, zinc salt 3-5 parts, Sodium aluminate 5-7 parts, water 100-200 parts.
The preparation method of the modification infusorial earth is:Carried out after diatomite powder, zinc salt, sodium aluminate and water are well mixed Reaction, 50-100 DEG C of reaction temperature, reaction time 1-3h, then reaction product is added in autoclave, at 140-160 DEG C and 6-10h is cured under 0.5-0.8Mpa pressure conditions, the solid product being filtrated to get is in 100-120 DEG C of drying.
The zinc salt is zinc sulfate, zinc acetate, zinc nitrate or anhydrous zinc chloride.
The dispersant is selected from oleic acid, palmitic acid, enuatrol, potassium palmitate or triethanolamine.
The preparation method of described Water-permeable inorganic material, comprises the following steps:
(1)Gangue, flyash, quartz sand, Suzhou soil, modification infusorial earth and montmorillonite are crushed, sieved;
(2)By step(1)Obtained material and paraffin, potassium titanate crystal whisker, swelling perlite powder, silicon carbide powder, glass fibre After being well mixed with hydroxymethyl cellulose, ball milling is carried out;
(3)By step(2)It is compressing with forcing press after obtained material is well mixed with thickener, dispersant and water;Then Dry, then formed in 1200-1300 DEG C of sintering, sintering time 3-6h at 110-120 DEG C.
Gangue, flyash and quartz sand are the base materials of Water-permeable inorganic material in formula provided by the invention, are main particles Particle, it can make Water-permeable inorganic material that there is certain intensity and internal structure;Suzhou soil and montmorillonite can viscosify slurry, and Can preferably it be coated with substrate particle;Paraffin and hydroxymethyl cellulose can improve phosphoric acid, prevent particulate matter from settling;Metatitanic acid Potassium whisker and glass fibre form hollow space structure in Water-permeable inorganic material and can improve preferable intensity;Carborundum Powder has preferable intensity, after other mix particles, it is possible to increase the inner hollow degree of seepage brick, improves seepage of water, changes Property diatomite Surface coating aluminium hydroxide, with surface charge can be formed in other raw material mixed processes, improve its dispersiveness And the performance combined with other particles;Water-permeable inorganic material compression strength provided by the invention is more than 30Mpa, and coefficient of permeability is big In 1.7 × 10-2 cm/S。
Embodiment
Embodiment 1
A kind of Water-permeable inorganic material, it is prepared by the raw material of following parts by weight:Gangue 30-40 parts, flyash 10-15 parts, Quartz sand 10-20 parts, Suzhou soil 5-10 parts, modification infusorial earth 15-20 parts, montmorillonite 5-10 parts, paraffin 10-30 parts, potassium titanate Whisker 5-15 parts, swelling perlite powder 5-10 parts, silicon carbide powder 10-15 parts, glass fibre 5-10 parts, hydroxymethyl cellulose 15-20 parts, thickener 5-10 parts, dispersant 5-10 parts, water 30-40 parts;Thickener is sodium carboxymethylcellulose, guar gum, Huang Virgin rubber, carragheen or cyclohexaamylose;Dispersant is selected from oleic acid, palmitic acid, enuatrol, potassium palmitate or triethanolamine.
Flyash is II levels flyash, quartz sand, Suzhou soil originate from Suzhou Yangshan, alumina content 37-39%, titanium dioxide Silicone content 46-48%;Potassium titanate crystal whisker is crystal whisker of hexa potassium titanate.
Modification infusorial earth is Modified by Aluminum Hydroxide diatomite, i.e., ordinary silicon diatomaceous earth after modified, Surface coating aluminium hydroxide, It is prepared by the raw material of following parts by weight:Diatomite powder 15-20 parts, zinc salt 3-5 parts, sodium aluminate 5-7 parts, water 100-200 Part;Its preparation method is:Reacted after diatomite powder, zinc salt, sodium aluminate and water are well mixed, reaction temperature 50-100 DEG C, reaction time 1-3h, then by reaction product add autoclave in, in 140-160 DEG C and 0.5-0.8Mpa pressure conditions Lower curing 6-10h, the solid product being filtrated to get is in 100-120 DEG C of drying;Zinc salt is zinc sulfate, zinc acetate, zinc nitrate Or anhydrous zinc chloride.
The preparation method of above-mentioned Water-permeable inorganic material, comprises the following steps:
(1)Gangue, flyash, quartz sand, Suzhou soil, modification infusorial earth and montmorillonite are crushed with disintegrating machine, cross 100-250 Mesh sieve;
(2)By step(1)Obtained material and paraffin, potassium titanate crystal whisker, swelling perlite powder, silicon carbide powder, glass fibre After being well mixed with hydroxymethyl cellulose, add in planetary ball mill and carry out ball milling;
(3)By step(2)It is compressing with forcing press after obtained material is well mixed with thickener, dispersant and water;Then Dry, then formed in high temperature box type resistance furnace in 1200-1300 DEG C of sintering, sintering time 3-6h at 110-120 DEG C, Furnace cooling is taken out after the completion of sintering.
Embodiment 2
A kind of Water-permeable inorganic material, it is prepared by the raw material of following parts by weight:40 parts of gangue, 15 parts of flyash, quartz sand 10 parts, 5 parts of Suzhou soil, 20 parts of modification infusorial earth, 10 parts of montmorillonite, 30 parts of paraffin, 5 parts of potassium titanate crystal whisker, swelling perlite powder 10 parts, 15 parts of silicon carbide powder, 5 parts of glass fibre, 20 parts of hydroxymethyl cellulose, 10 parts of thickener guar gum, dispersant palm Sour 5 parts of potassium, 40 parts of water.
The preparation method of modification infusorial earth is:By weight by 20 parts of diatomite powder and 3 parts of zinc sulfate, sodium aluminate 7 Reacted after part, 100 parts of water are well mixed, reaction temperature is 100 DEG C, 3 hours reaction time;Reaction product is added again high Press in reactor, cured 10 hours at 140 DEG C of temperature and 0.5Mpa pressure conditions, the solid product being filtrated to get is at 120 DEG C At a temperature of drying.
The preparation method of above-mentioned Water-permeable inorganic material, comprises the following steps:
(1)Gangue, flyash, quartz sand, Suzhou soil, modification infusorial earth, montmorillonite are taken, is crushed raw material with disintegrating machine;
(2)The material that 1st step is obtained again with paraffin, potassium titanate crystal whisker, swelling perlite powder, silicon carbide powder, glass fibre, Added after hydroxymethyl cellulose is well mixed and ball milling is carried out into planetary ball mill;
(3)It is compressing with forcing press after the material that 2nd step obtains is well mixed with thickener, dispersant, water again, then Dried at 120 DEG C, be put into high temperature box type resistance furnace and burn till, firing temperature is 1300 DEG C, and sintering time is 3 h, sintering After the completion of furnace cooling take out.
Reference examples 1
Modification infusorial earth is transformed to without modified ordinary silicon diatomaceous earth during embodiment 2 is formulated, and remaining is the same as embodiment 2.
Reference examples 2
Silicon carbide powder removes during embodiment 2 is formulated, and remaining is the same as embodiment 2.
The Water-permeable inorganic material that embodiment 2 and reference examples are prepared carries out compression strength, coefficient of permeability performance test, Intensity test uses CSS-88000 electronic universal testers, and specimen size is the mm of 100mm × 100mm × 40, loading speed Spend for 0.5 mm/min, take the average value of 5 sample testing results.Coefficient of permeability measure reference JC/T945-2005, thoroughly Sealed between water instrument and test specimen with clay, the metering of timing reading, then calculate coefficient of permeability, its result is as shown in table 1.
The performance indications result of the embodiment 2 of table 1 and the Water-permeable inorganic material of reference examples
As can be seen from the above table, the Water-permeable inorganic material employed in the present invention has preferable mechanical strength and higher infiltration Performance.
Embodiment 3
A kind of Water-permeable inorganic material, it is prepared by the raw material of following parts by weight:35 parts of gangue, 10 parts of flyash, quartz sand 17 parts, 10 parts of Suzhou soil, 16 parts of modification infusorial earth, 5 parts of montmorillonite, 13 parts of paraffin, 15 parts of potassium titanate crystal whisker, swelling perlite powder 8 parts, it is 11 parts of silicon carbide powder, 7 parts of glass fibre, 18 parts of hydroxymethyl cellulose, 5 parts of thickener sodium carboxymethylcellulose, scattered 10 parts of agent palm fibre oleic acid, 33 parts of water.
The preparation method of modification infusorial earth is:By weight by 15 parts of diatomite powder and 3 parts of zinc sulfate, sodium aluminate 6 Reacted after part, 120 parts of water are well mixed, reaction temperature is 60 DEG C, 3 hours reaction time;Reaction product is added again high Press in reactor, cured 8 hours at 150 DEG C of temperature and 0.5Mpa pressure conditions, the solid product being filtrated to get is in 120 DEG C of temperature The lower drying of degree.
The preparation method of above-mentioned Water-permeable inorganic material, comprises the following steps:
(1)Gangue, flyash, quartz sand, Suzhou soil, modification infusorial earth, montmorillonite are taken, is crushed raw material with disintegrating machine;
(2)The material that 1st step is obtained again with paraffin, potassium titanate crystal whisker, swelling perlite powder, silicon carbide powder, glass fibre, Added after hydroxymethyl cellulose is well mixed and ball milling is carried out into planetary ball mill;
(3)It is compressing with forcing press after the material that 2nd step obtains is well mixed with thickener, dispersant, water again, then Dried at 120 DEG C, be put into high temperature box type resistance furnace and burn till, firing temperature is 1250 DEG C, and sintering time is 5 h, has been sintered Taken out into rear furnace cooling.
Embodiment 4
A kind of Water-permeable inorganic material, it is prepared by the raw material of following parts by weight:39 parts of gangue, 10 parts of flyash, quartz sand 15 parts, 9 parts of Suzhou soil, 18 parts of modification infusorial earth, 10 parts of montmorillonite, 16 parts of paraffin, 6 parts of potassium titanate crystal whisker, swelling perlite powder 5 Part, 10 parts of silicon carbide powder, 10 parts of glass fibre, 20 parts of hydroxymethyl cellulose, 8 parts of thickener sodium carboxymethylcellulose, disperse 9 parts of agent enuatrol, 40 parts of water.
The preparation method of modification infusorial earth is:By weight by 17 parts of diatomite powder and 3 parts of zinc acetate, sodium aluminate 7 Reacted after part, 160 parts of water are well mixed, reaction temperature is 80 DEG C, 2 hours reaction time;Reaction product is added again high Press in reactor, cured 10 hours at 140 DEG C of temperature and 0.8Mpa pressure conditions, the solid product being filtrated to get is at 100 DEG C At a temperature of drying.
The preparation method of above-mentioned Water-permeable inorganic material, comprises the following steps:
(1)Gangue, flyash, quartz sand, Suzhou soil, modification infusorial earth, montmorillonite are taken, is crushed raw material with disintegrating machine;
(2)The material that 1st step is obtained again with paraffin, potassium titanate crystal whisker, swelling perlite powder, silicon carbide powder, glass fibre, Added after hydroxymethyl cellulose is well mixed and ball milling is carried out into planetary ball mill;
(3)It is compressing with forcing press after the material that 2nd step obtains is well mixed with thickener, dispersant, water again, then Dried at 110 DEG C, be put into high temperature box type resistance furnace and burn till, firing temperature is 1250 DEG C, and sintering time is 6 h, has been sintered Taken out into rear furnace cooling.
Embodiment 5
A kind of Water-permeable inorganic material, it is prepared by the raw material of following parts by weight:30 parts of gangue, 11 parts of flyash, quartz sand 14 parts, 6 parts of Suzhou soil, 18 parts of modification infusorial earth, 7 parts of montmorillonite, 30 parts of paraffin, 5 parts of potassium titanate crystal whisker, swelling perlite powder 7 Part, 10 parts of silicon carbide powder, 8 parts of glass fibre, 16 parts of hydroxymethyl cellulose, 5 parts of thickener guar gum, dispersant palmitic acid 5 Part, 35 parts of water.
The preparation method of modification infusorial earth is:By weight by 16 parts of diatomite powder and 5 parts of zinc sulfate, sodium aluminate 5.5 parts, 150 parts of water it is well mixed after reacted, reaction temperature is 90 DEG C, reaction time 1h;Reaction product is added again high Press in reactor, cure 7h at 150 DEG C of temperature and 0.6Mpa pressure conditions, the solid product being filtrated to get is in 110 DEG C of temperature Lower drying.
The preparation method of above-mentioned Water-permeable inorganic material, comprises the following steps:
(1)Gangue, flyash, quartz sand, Suzhou soil, modification infusorial earth, montmorillonite are taken, is crushed raw material with disintegrating machine;
(2)The material that 1st step is obtained again with paraffin, potassium titanate crystal whisker, swelling perlite powder, silicon carbide powder, glass fibre, Added after hydroxymethyl cellulose is well mixed and ball milling is carried out into planetary ball mill;
(3)It is compressing with forcing press after the material that 2nd step obtains is well mixed with thickener, dispersant, water again, then Dried at 115 DEG C, be put into high temperature box type resistance furnace and burn till, firing temperature is 1200 DEG C, sintering time 4h, has been sintered Taken out into rear furnace cooling.
Embodiment 6
A kind of Water-permeable inorganic material, it is prepared by the raw material of following parts by weight:34 parts of gangue, 14 parts of flyash, quartz sand 10 parts, 7 parts of Suzhou soil, 18 parts of modification infusorial earth, 9 parts of montmorillonite, 14 parts of paraffin, 5 parts of potassium titanate crystal whisker, swelling perlite powder 7 Part, 12 parts of silicon carbide powder, 5 parts of glass fibre, 18 parts of hydroxymethyl cellulose, 10 parts of thickener guar gum, dispersant palmitic acid 6 parts of potassium, 33 parts of water.
The preparation method of modification infusorial earth is:By weight by 20 parts of diatomite powder and 5 parts of zinc nitrate, sodium aluminate 7 Reacted after part, 130 parts of water are well mixed, reaction temperature is 50 DEG C, reaction time 2h;It is anti-that reaction product is added into high pressure again Answer in kettle, cure 6h at 160 DEG C of temperature and 0.7Mpa pressure conditions, the solid product being filtrated to get dries at a temperature of 105 DEG C It is dry to produce.
The preparation method of above-mentioned Water-permeable inorganic material, comprises the following steps:
(1)Gangue, flyash, quartz sand, Suzhou soil, modification infusorial earth, montmorillonite are taken, is crushed raw material with disintegrating machine;
(2)The material that 1st step is obtained again with paraffin, potassium titanate crystal whisker, swelling perlite powder, silicon carbide powder, glass fibre, Added after hydroxymethyl cellulose is well mixed and ball milling is carried out into planetary ball mill;
(3)It is compressing with forcing press after the material that 2nd step obtains is well mixed with thickener, dispersant, water again, then Dried at 120 DEG C, be put into high temperature box type resistance furnace and burn till, firing temperature is 1200 DEG C, sintering time 3h, has been sintered Taken out into rear furnace cooling.
Embodiment 7
A kind of Water-permeable inorganic material, it is prepared by the raw material of following parts by weight:37 parts of gangue, 15 parts of flyash, quartz sand 10 parts, 8 parts of Suzhou soil, 20 parts of modification infusorial earth, 6 parts of montmorillonite, 10 parts of paraffin, 9 parts of potassium titanate crystal whisker, swelling perlite powder 10 Part, 12 parts of silicon carbide powder, 7 parts of glass fibre, 18 parts of hydroxymethyl cellulose, 9 parts of thickener carragheen, dispersant enuatrol 10 Part, 38 parts of water.
The preparation method of modification infusorial earth is:By weight by 19 parts of diatomite powder and 5 parts of zinc chloride, sodium aluminate 6 Reacted after part, 100 parts of water are well mixed, reaction temperature is 100 DEG C, reaction time 3h;Reaction product is added into high pressure again In reactor, 9h is cured at 160 DEG C of temperature and 0.5Mpa pressure conditions, the solid product being filtrated to get is at a temperature of 110 DEG C Drying.
The preparation method of above-mentioned Water-permeable inorganic material, comprises the following steps:
(1)Gangue, flyash, quartz sand, Suzhou soil, modification infusorial earth, montmorillonite are taken, is crushed raw material with disintegrating machine;
(2)The material that 1st step is obtained again with paraffin, potassium titanate crystal whisker, swelling perlite powder, silicon carbide powder, glass fibre, Added after hydroxymethyl cellulose is well mixed and ball milling is carried out into planetary ball mill;
(3)It is compressing with forcing press after the material that 2nd step obtains is well mixed with thickener, dispersant, water again, then Dried at 110 DEG C, be put into high temperature box type resistance furnace and burn till, firing temperature is 1300 DEG C, sintering time 3h, has been sintered Taken out into rear furnace cooling.
Embodiment 8
A kind of Water-permeable inorganic material, it is prepared by the raw material of following parts by weight:31 parts of gangue, 15 parts of flyash, quartz sand 18 parts, 5 parts of Suzhou soil, 19 parts of modification infusorial earth, 8 parts of montmorillonite, 10 parts of paraffin, 14 parts of potassium titanate crystal whisker, swelling perlite powder 7 Part, 10 parts of silicon carbide powder, 5 parts of glass fibre, 17 parts of hydroxymethyl cellulose, 8 parts of thickener guar gum, dispersant palmitic acid 5 Part, 34 parts of water.
The preparation method of modification infusorial earth is:By weight by 18 parts of diatomite powder and 3.5 parts of zinc acetate, sodium aluminate 7 parts, 100 parts of water it is well mixed after reacted, reaction temperature is 70 DEG C, reaction time 1h;Reaction product is added into high pressure again In reactor, 10h is cured at 140 DEG C of temperature and 0.8Mpa pressure conditions, the solid product being filtrated to get is at a temperature of 115 DEG C Drying.
The preparation method of above-mentioned Water-permeable inorganic material, comprises the following steps:
(1)Gangue, flyash, quartz sand, Suzhou soil, modification infusorial earth, montmorillonite are taken, is crushed raw material with disintegrating machine;
(2)The material that 1st step is obtained again with paraffin, potassium titanate crystal whisker, swelling perlite powder, silicon carbide powder, glass fibre, Added after hydroxymethyl cellulose is well mixed and ball milling is carried out into planetary ball mill;
(3)It is compressing with forcing press after the material that 2nd step obtains is well mixed with thickener, dispersant, water again, then Dried at 115 DEG C, be put into high temperature box type resistance furnace and burn till, firing temperature is 1300 DEG C, sintering time 6h, has been sintered Taken out into rear furnace cooling.
9-30 Water-permeable inorganic materials formula of the embodiment of the present invention and modification infusorial earth formula are shown in Table 2-4, remaining same embodiment 2。
Table 2
Table 3
Table 4
Above-described is only the preferred embodiment of the present invention, it is noted that for those skilled in the art, Under the premise of general idea of the present invention is not departed from, some changes and improvements can also be made, these should also be considered as the present invention's Protection domain.

Claims (7)

1. a kind of Water-permeable inorganic material, it is characterised in that be prepared by the raw material of following parts by weight:Gangue 30-40 parts, powder Coal ash 10-15 parts, quartz sand 10-20 parts, Suzhou soil 5-10 parts, modification infusorial earth 15-20 parts, montmorillonite 5-10 parts, paraffin 10- 30 parts, potassium titanate crystal whisker 5-15 parts, swelling perlite powder 5-10 parts, silicon carbide powder 10-15 parts, glass fibre 5-10 parts, hydroxyl Methylcellulose 15-20 parts, thickener 5-10 parts, dispersant 5-10 parts, water 30-40 parts.
2. Water-permeable inorganic material as claimed in claim 1, it is characterised in that the modification infusorial earth by following parts by weight original Material is prepared:Diatomite powder 15-20 parts, zinc salt 3-5 parts, sodium aluminate 5-7 parts, water 100-200 parts.
3. Water-permeable inorganic material as claimed in claim 2, it is characterised in that the preparation method of the modification infusorial earth is:By silicon Reacted after diatomaceous earth powder, zinc salt, sodium aluminate and water are well mixed, 50-100 DEG C of reaction temperature, reaction time 1-3h, then will Reaction product is added in autoclave, is cured 6-10h under 140-160 DEG C and 0.5-0.8Mpa pressure conditions, is filtrated to get Solid product in 100-120 DEG C of drying.
4. the Water-permeable inorganic material as described in claim any one of 2-3, it is characterised in that the zinc salt is zinc sulfate, acetic acid Zinc, zinc nitrate or anhydrous zinc chloride.
5. Water-permeable inorganic material as claimed in claim 1, it is characterised in that the thickener is sodium carboxymethylcellulose, Guar Glue, xanthans, carragheen or cyclohexaamylose.
6. Water-permeable inorganic material as claimed in claim 1, it is characterised in that the dispersant is selected from oleic acid, palmitic acid, oleic acid Sodium, potassium palmitate or triethanolamine.
7. the preparation method of the Water-permeable inorganic material as described in claim any one of 1-6, it is characterised in that comprise the following steps:
Gangue, flyash, quartz sand, Suzhou soil, modification infusorial earth and montmorillonite are crushed, sieved;
By step(1)Obtained material and paraffin, potassium titanate crystal whisker, swelling perlite powder, silicon carbide powder, glass fibre and hydroxyl After methylcellulose is well mixed, ball milling is carried out;
By step(2)It is compressing with forcing press after obtained material is well mixed with thickener, dispersant and water;Then in Dry, then formed in 1200-1300 DEG C of sintering, sintering time 3-6h at 110-120 DEG C.
CN201710533087.2A 2017-07-03 2017-07-03 Water-permeable inorganic material and preparation method thereof Expired - Fee Related CN107522471B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104072060A (en) * 2014-07-01 2014-10-01 谢伟杰 Ceramic water-permeable tile
CN105732066A (en) * 2016-03-09 2016-07-06 李�杰 Re-utilizing method of sludge in municipal sewage treatment plant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104072060A (en) * 2014-07-01 2014-10-01 谢伟杰 Ceramic water-permeable tile
CN105732066A (en) * 2016-03-09 2016-07-06 李�杰 Re-utilizing method of sludge in municipal sewage treatment plant

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