CN103806566A - Unfired basalt foaming acoustical board - Google Patents

Unfired basalt foaming acoustical board Download PDF

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Publication number
CN103806566A
CN103806566A CN201410031759.6A CN201410031759A CN103806566A CN 103806566 A CN103806566 A CN 103806566A CN 201410031759 A CN201410031759 A CN 201410031759A CN 103806566 A CN103806566 A CN 103806566A
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basalt
frame
concave
built
convex clay
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CN201410031759.6A
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Inventor
黄允金
黄飞翔
许庆华
袁长兵
许盛英
蒋文兰
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许庆华
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Priority to CN201410031759.6A priority Critical patent/CN103806566A/en
Publication of CN103806566A publication Critical patent/CN103806566A/en
Pending legal-status Critical Current

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Abstract

The invention discloses an unfired basalt foaming acoustical board. According to the technical scheme, the unfired basalt foaming acoustical board is characterized in that a built-in frame is horizontally placed on a mold, after short steel pipes in the built-in frame are inserted into stand columns, basalt cement foaming agent is poured on the periphery of the built-in frame, the built-in frame is totally inlaid in the basalt cement foaming agent, maintenance is performed according to a conventional cement product maintenance method, and packaging is performed to form an unfired basalt foaming acoustical board finished product; the basalt cement foaming agent is prepared from vesicular basalt, high-viscosity attapulgite clay powder, cement and other raw materials; the basalt cement foaming agent and the built-in frame form an integrated whole after the basalt cement foaming agent is cured, and thus the overall strength, the bending resistance and the actual using effect of the unfired basalt foaming acoustical board are improved. The unfired basalt foaming acoustical board not only can be used for effectively controlling noise pollution but also has the functions of heat preservation and air purification and is suitable for being mounted in facilities such as expressways, viaducts, urban light rails, subways, public places and the like.

Description

Unburned basalt foaming abatvoix
Technical field
The present invention relates to abatvoix, be specifically related to a kind of unburned basalt foaming abatvoix.
Background technology
City noise is having a strong impact on townsfolk's normal life and health of human body, city noise mainly refers to traffic noise, factory noise, construction noise pollution and noise of social activities, the influence basin of its noise and influence degree are day by day serious, on the impact of civic living environment greatly, become one of noticeable city environmental pollution problem.
Conventionally adopt damping material to produce the products such as some abatvoixs, noise barrier, sound-absorbing net and noise damper and control noise pollution, also having some damping materials is to produce the products such as abatvoix after processing by foaming, to improve the performance of product.
Abatvoix quality after sale foaming is in the market more crisp, and the bulk strength of abatvoix, counter-bending ability and result of use are undesirable; Be installed in the process on building wall at abatvoix, abatvoix needs on-the-spot 4 the above bolts hole that bore, not only time-consuming, increase difficulty of construction, and be easy to abatvoix be broken or shatter in when boring, after abatvoix is arranged on building wall, due to the effect of gravity, can cause the abatvoix fragmentation from building wall after boring to come off.
Summary of the invention
The object of the invention is to overcome weak point in prior art, a kind of unburned basalt foaming abatvoix is provided.
Unburned basalt foaming abatvoix is made up of basalt cement blowing agent and built-in frame, built-in frame is lain on mould, after short steel pipes in built-in frame inserts column, adopt basalt cement blowing agent to be cast in built-in frame periphery, built-in frame is embedded in the inside of basalt cement blowing agent completely, maintenance is carried out in conventional maintenance process according to cement products, is packaged as unburned basalt foaming abatvoix finished product.
Basalt belongs to basic volcanic rocks, it is the main component of earth oceanic crust and moon lunar maria, basaltic Main Ingredients and Appearance is silica, alundum (Al2O3), iron oxide, calcium oxide, magnesia (also having a small amount of potassium oxide, sodium oxide molybdena), wherein dioxide-containing silica is maximum, accounts for 45 to 50 percent left and right, the basalt of many pores shape, its pore is many, quality is lighter, has sound insulation, the feature such as heat insulation, and the present invention selects pore shape basalt.
Attapulgite has another name called palygorskite or Palygorskite, be a kind of layer of chain structure containing Shuifu County's zeopan clay mineral, attapulgite has unique layer chain structure feature, in its structure, has crystal lattice, therefore contain the Na of non-quantitative in crystal +, Ca 2+, Fe 3+, Al 3+, crystal is needle-like, fibrous or fiber collection shape.Attapulgite has unique dispersion, high temperature resistant, the anti-good colloidal nature such as saline and alkaline and higher adsorption capacity, and has certain plasticity and adhesion stress.
The Concave-convex clay rod product of selling on market, there are respectively Concave-convex clay rod powder and the large series of high sticky Concave-convex clay rod powder two, viscosity≤the 1800mPas of Concave-convex clay rod powder, high sticky Concave-convex clay rod soil property exquisiteness, has oily soapy, light weight, property are crisp, fracture is conchoidal or irregular shape, and water imbibition is strong, tool viscosity and plasticity when wet, viscosity >=the 2200mPas of high sticky Concave-convex clay rod powder, is conducive to the bonding between raw material.
High sticky Concave-convex clay rod powder refers to gets 28.0g Concave-convex clay rod powder sample, add in the suspension cup of homogenizer, add again 372g water, suspension cup is placed on homogenizer, under the rotating speed of 11000 revs/min, stir 20 minutes, to pour in the beaker of 250mL through high-speed stirred sample suspension, use NDJ-1 type rotation viscometer carries out the viscosity of test suspension liquid, the Concave-convex clay rod powder of tested viscosity value >=2200 mPas again.
The pH value of Concave-convex clay rod raw ore is 8~9, need in the present invention to carry out acidification, acidified Concave-convex clay rod after treatment is activated attapulgite, the various performances of activated attapulgite all will be greatly improved, particularly strengthen the adsorption cleaning ability of concave convex rod, it is 5.5~7.5 that activated attapulgite pH value is controlled, water content≤2%.
Lauryl sodium sulfate is white or faint yellow powdery, water-soluble, insensitive to alkali and hard water, has decontamination, emulsification and excellent foaming power, is a kind of nontoxic anion surfactant; When powdery basalt blowing agent and water mix, a large amount of bubble of the common generation of lauryl sodium sulfate and SODIUM PERCARBONATE.
SODIUM PERCARBONATE is a kind of inorganic salts, and the particulate powder that is white in color can be decomposed rapidly after SODIUM PERCARBONATE contacts with water, discharges a large amount of oxygen.
Sodium Polyacrylate is a kind of new functional macromolecule material, for white or buff powder, be dissolved in cold water, stable to variations in temperature, be a kind of surfactant with multiple property, be conducive in the present invention improve the effect of the thickening, foaming of powdery basalt blowing agent, stable, emulsification, dispersion, bonding, film forming and water conservation.
Sodium pyrophosphate is a kind of water white transparency crystallization or white crystalline powder, soluble in water, in the present invention as dispersing agent and emulsifier.
Poly-naphthaldehyde sulfonate sodium is brown or dark-brown powder, and soluble in water, acidproof, alkaline-resisting, resistance to hard water, has good diffusivity; In the time that powdery basalt blowing agent and water mix, generate a large amount of bubbles, it is more even that sodium pyrophosphate and poly-naphthaldehyde sulfonate sodium are conducive to the bubble distribution of generation.
Cement selection portland cement.
Cement foamed mixer is the conventional plant equipment of building materials industry.
The present invention is achieved by following technical proposals:
Unburned basalt foaming abatvoix is a kind of rectangular plate-shaped body, is made up of basalt cement blowing agent and built-in frame, is designed with 4~32 short steel pipes in built-in frame, and the endoporus of short steel pipes is the installing hole of unburned basalt foaming abatvoix; Built-in frame is lain on mould, after short steel pipes in built-in frame inserts column, adopt basalt cement blowing agent to be cast in built-in frame periphery, the inside that built-in frame is embedded in basalt cement blowing agent is completely unburned basalt foaming abatvoix semiproduct; Solidify and process through 2~7 days leave standstill, unburned basalt foaming abatvoix semiproduct are taken out from mould, carry out maintenance according to the conventional maintenance process of cement products, after 28 days, be packaged as unburned basalt foaming abatvoix finished product.
Basalt cement blowing agent batching is made up of following component by weight percentage: powdery basalt blowing agent 25~65%, cement 5~30% and water 20~65%; The preparation method of basalt cement blowing agent: the batching of basalt cement blowing agent is added in cement foamed mixer and stirred as paste basalt cement blowing agent.
Powdery basalt blowing agent batching is made up of following component by weight percentage: pore shape basalt 15~45%, high sticky Concave-convex clay rod powder 5~15%, activated attapulgite 5~25%, lauryl sodium sulfate 1~35%, SODIUM PERCARBONATE 1~25%, Sodium Polyacrylate 0.01~5%, sodium pyrophosphate 0.01~5% and poly-naphthaldehyde sulfonate sodium 0.01~5%; The production method of powdery basalt blowing agent: will powdery basalt blowing agent stir in batching input mixer, input after stirring and be processed as powdery basalt blowing agent, grain fineness≤0.074 millimeter in grinding machine.
Powdery basalt blowing agent has been applied for patent of invention, China Patent Publication No.: CN 103265221A, open day: on 08 28th, 2013.
The sticky Concave-convex clay rod powder of described height is the Concave-convex clay rod powder that adopts the processing technology that improves viscosity of attapulgite clay to produce, it is characterized in that, and from the Concave-convex clay rod of mining area exploitation, need to be through the weathering of 30~120 days; Modification processing method is: calculate by weight percentage, get the Concave-convex clay rod 94~98% after weathering, evenly add 2~6% sodium carbonate, jointly input in fermentation vat, add clear water to soak ageing, soak time is 72~120 hours; Get the Concave-convex clay rod after immersion, in input mixer, stir, and by the Concave-convex clay rod after stirring, be extruded into thin slice through extruder, its THICKNESS CONTROL is at 0.5~2 millimeter, by Concave-convex clay rod thin slice, carry out airing, the Concave-convex clay rod thin slice after airing, its water content≤15%; Batching is calculated by weight percentage: Concave-convex clay rod 94~98%, high hydroscopic resin 0.5~5% and cellulose 0.5~3% after airing, above-mentioned batching is stirred, and after stirring, input and in grinding machine, carry out abrasive dust, grain fineness≤0.074 millimeter.
Above-mentioned production technology is to adopt " the improving the processing technology of viscosity of attapulgite clay " of being applied on June 20th, 2005 by the inventor, and Chinese patent notice of authorization number is: CN 1317067C, notice of authorization day: on May 23rd, 2007.
The production method of described activated attapulgite is: the 1. preparation of dilute sulfuric acid, is made up of following component by weight percentage: the sulfuric acid 3~5% of concentration 98 ﹪, water 95~97%; 2. the batching of acidification, comprises following component by weight percentage: Concave-convex clay rod raw ore 55~65%, and dilute sulfuric acid 35~45%, slowly adds dilute sulfuric acid and in Concave-convex clay rod raw ore, carries out acidification; 3. extruding: by the Concave-convex clay rod after acidifying, push as tablet thickness≤3 millimeter of tablet by extruder; 4. roasting: the tablet of Concave-convex clay rod is transported in calcinating kiln and carries out roasting, and roasting time is 1.5~3 hours, and sintering temperature is controlled at 320~450 ℃, and the Concave-convex clay rod tablet after roasting is activated attapulgite.
This production method is the production method that adopts the activated attapulgite in " embossed rod medicinal health-care bathing-mud powder " of application on March 7th, 2006 by the inventor, the China Patent Publication No. of embossed rod medicinal health-care bathing-mud powder is: CN1850026, open day: on October 25th, 2006.
The sulfuric acid of described PCm and concentration 98 ﹪ is all weight percentage.
Described built-in frame is a kind of rectangular steel structure frame, in built-in frame, is made up of 4~32 short steel pipes, 4~52 punching expanded metal laths and 2~42 reinforcing ribs; The upper plane of short steel pipes is processed as a kind of counter sink, between short steel pipes and short steel pipes, be welded as a rectangular frame with punching expanded metal lath, punching expanded metal lath hole is circular opening, the horizontal center line overlaid at the horizontal center line at short steel pipes height 1/2 place and punching expanded metal lath width 1/2 place, the interior diagonal take height 1/2 place between short steel pipes and short steel pipes of rectangular frame is as interface, be welded as reinforcing rib with screw-thread steel, jointly form a built-in frame; In built-in frame, the plane of short steel pipes top counter sink consists of plane on built-in frame jointly, and short steel pipes lower flat consists of built-in frame lower plane jointly.
For the production of the separate case application of built-in frame of abatvoix utility model patent, number of patent application is: 201320579228.1, the applying date: on September 18th, 2013.
Described mould is a kind of rectangular mould, is made up of a block length square floor, a rectangle locating slot, a rectangle frame, 2 rectangle handles and 4~32 cylindrical columns; Locating slot is welded on the upper plane of die bottom plate according to the position dimension of design, column is arranged on the upper plane of die bottom plate according to the relative position size of design, frame is placed in locating slot, 2 handles are arranged on respectively middle outside frame the right and left, and the lower plane of die bottom plate is placed on vibrations workbench.
For the production of the separate case application of mould of abatvoix utility model patent, number of patent application is: 201320575991.7, the applying date: on September 17th, 2013.
In unburned basalt foaming abatvoix, inlayed built-in frame, basalt cement blowing agent solidifies a rear and integrated entirety of built-in frame formation, has increased bulk strength, counter-bending ability and the practical effect of unburned basalt foaming abatvoix.
Basalt cement blowing agent in unburned basalt foaming abatvoix has that foaming capacity is strong, coefficient of foaming is high, unit volume bubble production volume large, foam adventitia good toughness is difficult for brokenly, foam stability is good, can be for a long time not froth breaking, foam exquisiteness, the advantage such as the hole size that generates in medium is even, bleeding quantity is low and the compatibility of working medium is good.
Unburned basalt foaming abatvoix there will not be layering in casting process, and product stripping speed is fast, and finish is good.
Unburned basalt foaming abatvoix not only can effectively be controlled noise pollution, the function that is incubated in addition and purifies air.
At construction site, do not need boring, directly with cross recessed countersunk head tapping screw, unburned basalt foaming abatvoix is arranged on the metope of building, saving of work and time, can not cause the fragmentation from building wall of unburned basalt foaming abatvoix to come off yet.
Unburned basalt foaming abatvoix is applicable to be arranged in the facilities such as speedway, viaduct, urban light rail, subway, factory, warehouse, public place.
Accompanying drawing explanation
Fig. 1 is unburned basalt foaming abatvoix schematic diagram, Fig. 2 be the A-A of Fig. 1 to view, Fig. 3 is the schematic diagram of built-in frame while lying in cast in mould, unburned basalt foaming abatvoix is arranged on the schematic diagram on building wall by Fig. 4.
As shown in the figure: the 1st, unburned basalt foaming abatvoix, the 2nd, built-in frame, the 3rd, basalt cement blowing agent, the 4th, mould, the 5th, short steel pipes, the 6th, column, the 7th, cross recessed countersunk head tapping screw, the 8th, the metope of building.
The specific embodiment
Below in conjunction with embodiment, the invention will be further described:
Unburned basalt foaming abatvoix is a kind of rectangular plate-shaped body 1, is made up of built-in frame 2 and basalt cement blowing agent 3, is designed with 6 short steel pipes 5 in built-in frame 2; Built-in frame 2 is lain on mould 4, after short steel pipes 5 in built-in frame 2 inserts column 6, adopt basalt cement blowing agent 3 to be cast in built-in frame 2 peripheries, built-in frame 2 is embedded in behind the inside of basalt cement blowing agent 3 completely, is unburned basalt foaming abatvoix semiproduct; Solidify and process through 5 days leave standstill, unburned basalt foaming abatvoix semiproduct are taken out from mould, carry out maintenance according to the conventional maintenance process of cement products, after 28 days, be packaged as unburned basalt foaming abatvoix finished product.
Basalt cement blowing agent batching is made up of following component by weight percentage: powdery basalt blowing agent 46%, cement 12% and water 42%; The preparation method of basalt cement blowing agent: the batching of basalt cement blowing agent is added in cement foamed mixer and stirred as paste basalt cement blowing agent.
Powdery basalt blowing agent batching is made up of following component by weight percentage: pore shape basalt 32%, high sticky Concave-convex clay rod powder 12%, activated attapulgite 23%, lauryl sodium sulfate 21%, SODIUM PERCARBONATE 10.3%, Sodium Polyacrylate 0.8%, sodium pyrophosphate 0.6% and poly-naphthaldehyde sulfonate sodium 0.3%; The production method of powdery basalt blowing agent: will powdery basalt blowing agent stir in batching input mixer, input after stirring and be processed as powdery basalt blowing agent, grain fineness≤0.074 millimeter in grinding machine.
At construction site, directly with cross recessed countersunk head tapping screw 7, unburned basalt foaming abatvoix 1 is arranged on the metope 8 of building.

Claims (5)

1. a unburned basalt foaming abatvoix, it is characterized in that, unburned basalt foaming abatvoix is a kind of rectangular plate-shaped body, formed by basalt cement blowing agent and built-in frame, in built-in frame, be designed with 4~32 short steel pipes, the endoporus of short steel pipes is the installing hole of unburned basalt foaming abatvoix; Built-in frame is lain on mould, after short steel pipes in built-in frame inserts column, adopt basalt cement blowing agent to be cast in built-in frame periphery, the inside that built-in frame is embedded in basalt cement blowing agent is completely unburned basalt foaming abatvoix semiproduct; Solidify and process through 2~7 days leave standstill, unburned basalt foaming abatvoix semiproduct are taken out from mould, carry out maintenance according to the conventional maintenance process of cement products, after 28 days, be packaged as unburned basalt foaming abatvoix finished product;
Described basalt cement blowing agent batching is made up of following component by weight percentage: powdery basalt blowing agent 25~65%, cement 5~30% and water 20~65%; The preparation method of basalt cement blowing agent: the batching of basalt cement blowing agent is added in cement foamed mixer and stirred as paste basalt cement blowing agent;
Described powdery basalt blowing agent batching is made up of following component by weight percentage: pore shape basalt 15~45%, high sticky Concave-convex clay rod powder 5~15%, activated attapulgite 5~25%, lauryl sodium sulfate 1~35%, SODIUM PERCARBONATE 1~25%, Sodium Polyacrylate 0.01~5%, sodium pyrophosphate 0.01~5% and poly-naphthaldehyde sulfonate sodium 0.01~5%; The production method of powdery basalt blowing agent: will powdery basalt blowing agent stir in batching input mixer, input after stirring and be processed as powdery basalt blowing agent, grain fineness≤0.074 millimeter in grinding machine.
2. high sticky Concave-convex clay rod powder is the Concave-convex clay rod powder that adopts the processing technology that improves viscosity of attapulgite clay to produce according to claim 1, it is characterized in that, and from the Concave-convex clay rod of mining area exploitation, need to be through the weathering of 30~120 days; Modification processing method is: calculate by weight percentage, get the Concave-convex clay rod 94~98% after weathering, evenly add 2~6% sodium carbonate, jointly input in fermentation vat, add clear water to soak ageing, soak time is 72~120 hours; Get the Concave-convex clay rod after immersion, in input mixer, stir, and by the Concave-convex clay rod after stirring, be extruded into thin slice through extruder, its THICKNESS CONTROL is at 0.5~2 millimeter, by Concave-convex clay rod thin slice, carry out airing, the Concave-convex clay rod thin slice after airing, its water content≤15%; Batching is calculated by weight percentage: Concave-convex clay rod 94~98%, high hydroscopic resin 0.5~5% and cellulose 0.5~3% after airing, above-mentioned batching is stirred, and after stirring, input and in grinding machine, carry out abrasive dust, grain fineness≤0.074 millimeter;
The sticky Concave-convex clay rod powder of described height refers to gets 28.0g Concave-convex clay rod powder sample, add in the suspension cup of homogenizer, add again 372g water, suspension cup is placed on homogenizer, under the rotating speed of 11000 revs/min, stir 20 minutes, to pour in the beaker of 250mL through high-speed stirred sample suspension, use NDJ-1 type rotation viscometer carries out the viscosity of test suspension liquid, the Concave-convex clay rod powder of tested viscosity value >=2200 mPas again.
3. the production method of activated attapulgite according to claim 1, is characterized in that, the 1. preparation of dilute sulfuric acid, is made up of following component by weight percentage: the sulfuric acid 3~5% of concentration 98 ﹪, water 95~97%; 2. the batching of acidification, comprises following component by weight percentage: Concave-convex clay rod raw ore 55~65%, and dilute sulfuric acid 35~45%, slowly adds dilute sulfuric acid and in Concave-convex clay rod raw ore, carries out acidification; 3. extruding: by the Concave-convex clay rod after acidifying, push as tablet thickness≤3 millimeter of tablet by extruder; 4. roasting: the tablet of Concave-convex clay rod is transported in calcinating kiln and carries out roasting, and roasting time is 1.5~3 hours, and sintering temperature is controlled at 320~450 ℃, and the Concave-convex clay rod tablet after roasting is activated attapulgite.
4. built-in frame is a kind of rectangular steel structure frame according to claim 1, it is characterized in that, in built-in frame, is made up of 4~32 short steel pipes, 4~52 punching expanded metal laths and 2~42 reinforcing ribs; The upper plane of short steel pipes is processed as a kind of counter sink, between short steel pipes and short steel pipes, be welded as a rectangular frame with punching expanded metal lath, punching expanded metal lath hole is circular opening, the horizontal center line overlaid at the horizontal center line at short steel pipes height 1/2 place and punching expanded metal lath width 1/2 place, the interior diagonal take height 1/2 place between short steel pipes and short steel pipes of rectangular frame is as interface, be welded as reinforcing rib with screw-thread steel, jointly form a built-in frame; In built-in frame, the plane of short steel pipes top counter sink consists of plane on built-in frame jointly, and short steel pipes lower flat consists of built-in frame lower plane jointly.
5. mould is a kind of rectangular mould according to claim 1, it is characterized in that, is made up of a block length square floor, a rectangle locating slot, a rectangle frame, 2 rectangle handles and 4~32 cylindrical columns; Locating slot is welded on the upper plane of die bottom plate according to the position dimension of design, column is arranged on the upper plane of die bottom plate according to the relative position size of design, frame is placed in locating slot, 2 handles are arranged on respectively middle outside frame the right and left, and the lower plane of die bottom plate is placed on vibrations workbench.
CN201410031759.6A 2014-01-23 2014-01-23 Unfired basalt foaming acoustical board Pending CN103806566A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104129795A (en) * 2014-07-27 2014-11-05 许盛英 Acidified basalt

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0648810A (en) * 1992-07-31 1994-02-22 Yoshiyuki Ogushi Production of sound absorbing board
CN103265221A (en) * 2013-06-07 2013-08-28 许盛英 Powdery basalt foaming agent
CN103265213A (en) * 2013-05-26 2013-08-28 许盛英 Powdery attapulgite foaming agent
CN103465355A (en) * 2013-09-12 2013-12-25 许庆华 Mould for producing environment-friendly flame-retardant acoustic boards
CN103485431A (en) * 2013-09-13 2014-01-01 许庆华 Inlaid frame for production of environment-friendly flame-retardant acoustic board
CN103526837A (en) * 2013-10-13 2014-01-22 许庆华 Environment-friendly flint clay acoustic board
CN103526854A (en) * 2013-10-14 2014-01-22 许庆华 Unfired volcanic ash foamed acoustic panel
CN203449444U (en) * 2013-09-17 2014-02-26 许庆华 Mold for producing acoustic panel

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0648810A (en) * 1992-07-31 1994-02-22 Yoshiyuki Ogushi Production of sound absorbing board
CN103265213A (en) * 2013-05-26 2013-08-28 许盛英 Powdery attapulgite foaming agent
CN103265221A (en) * 2013-06-07 2013-08-28 许盛英 Powdery basalt foaming agent
CN103465355A (en) * 2013-09-12 2013-12-25 许庆华 Mould for producing environment-friendly flame-retardant acoustic boards
CN103485431A (en) * 2013-09-13 2014-01-01 许庆华 Inlaid frame for production of environment-friendly flame-retardant acoustic board
CN203449444U (en) * 2013-09-17 2014-02-26 许庆华 Mold for producing acoustic panel
CN103526837A (en) * 2013-10-13 2014-01-22 许庆华 Environment-friendly flint clay acoustic board
CN103526854A (en) * 2013-10-14 2014-01-22 许庆华 Unfired volcanic ash foamed acoustic panel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104129795A (en) * 2014-07-27 2014-11-05 许盛英 Acidified basalt

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Application publication date: 20140521