CN102503339B - Novel wall brick manufactured by utilizing fluorgypsum and tailing waste residues and preparation method for novel wall brick - Google Patents
Novel wall brick manufactured by utilizing fluorgypsum and tailing waste residues and preparation method for novel wall brick Download PDFInfo
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- CN102503339B CN102503339B CN 201110353092 CN201110353092A CN102503339B CN 102503339 B CN102503339 B CN 102503339B CN 201110353092 CN201110353092 CN 201110353092 CN 201110353092 A CN201110353092 A CN 201110353092A CN 102503339 B CN102503339 B CN 102503339B
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Abstract
The invention belongs to the technical field of building materials, and in particular relates to a wall brick and a preparation method thereof. The novel wall brick is manufactured by utilizing fluorgypsum and tailing waste residues, and is characterized by being prepared from a solid material, an active excitant and water, wherein the active excitant is 0.2 to 0.4 percent of the total mass of the solid material, and the water is 10 to 15 percent of the total mass of the solid material and the active excitant; and the solid material consists of the following raw materials in percentage by mass: 20 to 60 percent of fluorgypsum, 20 to 44.5 percent of tailing waste residues, 10 to 30 percent of other aggregates and 5 to 10 percent of basic material. The invention has the characteristic that: the wall brick is low in production cost.
Description
Technical field
The invention belongs to building material technical field, be specifically related to a kind of wall body brick and preparation method thereof.
Background technology
Fluorgypsum is in the process of Acid of Hydrofluoric Acid Production, and the waste residue based on anhydrous calciumsulphate by sulfuric acid and fluorite reaction output mainly originates from Acid of Hydrofluoric Acid Production enterprise.The about 4t fluorgypsum of every production 1t HF discharging.At present, nearly 1,400,000 tons of China's anhydrous hydrofluoric acid production capacity, output surpasses 1,000,000 tons, and the fluorgypsum quantity discharged is more than 4,000,000 tons, and quantity is considerable.When fluorgypsum is discharged in the stove, often have residual sulfuric acid and hydrofluoric acid and be strongly-acid, pH=0.5～1.0, according to the rules, the refuse of leach liquor pH≤2 or pH 〉=12.5 is the corrodibility refuse, so fluorgypsum has severe corrosive.Sour gas can be diffused into soil, water body on every side after entering atmospheric environment simultaneously, thereby causes wider pollution.The fluorgypsum of new discharging is the xeraphium granular solids, and in transportation and stacking process, the fluorgypsum powder easily flies away with the wind, has not only increased the content of total suspended particles in the air, pollutant atmosphere, and enlarged the area and the scope that endanger.Fluorgypsum is as a kind of II type dehydrated gyp-, though have potential hydration activity, but hydration rate is slow, time of coagulation is long, and early strength is low, and has very strong acidity, therefore can not directly use as gelling material, cause bulk deposition, both strengthened the burden of business processes, also environment has been caused pollution to a certain degree.In addition, various mill tailingss are the main bodys of China's solid waste always, and utilization ratio is very low, not only takies a large amount of soils, and the security incident on dam, tail storehouse happens occasionally.Therefore, fully utilize these waste residues, to the protection environment, realize that Sustainable development and recycling economy are significant.
On the other hand, China's rapid economic development, fundamental construction needs a large amount of materials for walls.Solid clay brick is because consuming a large amount of cultivated land resources and coal-fired resource, and country has made the hard and fast rule that much ban use of solid clay brick according to the practical development situation of each department.At present, EU countries has stopped the production of solid clay brick fully, uses the novel wall brick comprehensively.Its product can be accomplished A wide selection of colours and designs, diverse in function, increasingly automated production.Contrast EU countries novel wall brick development, China is just at the early-stage in this respect, has a bright future, and has a high potential.
The domestic research report that utilizes industry by-product gypsum brickmaking and patent are mainly based on the dihydrate gypsum system, as adopting phosphogypsum, desulfurated plaster, gypsum mine etc.Utilize the many to produce dry-mixed mortar class powder building materials of anhydrous fluorgypsum system.Utilize the research report of fluorgypsum brickmaking very few, patent documentation CN 1955141A relates to and utilizes desulfurated plaster, phosphogypsum, the technology of industry by-product gypsum brickmaking such as fluorgypsum.Wherein be in the example of main raw material with the fluorgypsum, needing slag powders, 3% carbide slag of adding 12% is aggregate as binding agent, with 11% cobble, add after a certain amount of chemical adhesive, exciting agent, water mix, again through mechanical extrusion forming, maintenance becomes solid or hollow brick again.But the water-soluble gypsum recrystallization promotor that this method is selected and the total amount of emulsion adhesive stick are up to 2%, causing on the one hand originally will certainly be very high, be unfavorable for the industry popularization, water-soluble gypsum recrystallization promotor is generally salts substances simultaneously, and 1% high volume can cause the serious scum of brick.The paper that the applicant delivers " research of anhydrous fluorgypsum brick " (seeing New Building Materials 02 phase in 2000) is that anhydrous fluorgypsum utilization is explored.The fluorgypsum brick prescription that provides in the paper is: fluorgypsum 60%, flyash 20%, slag are little 15%, unslaked lime 5%, JF
10.5%, JF
214%.Compare with this patent content, the adulterant that the slag micropowder that the former adds and flyash are manufacture of cement, its activity is higher, does not add any aggregate and mine tailing waste residue.And added 20～40% mine tailing waste residues and 10%～30% other aggregate among the present invention, and under the high-intensity prerequisite of assurance, reduce production costs greatly, be key content of the present invention.
Summary of the invention
The object of the present invention is to provide a kind of novel wall brick that utilizes fluorgypsum and the manufacturing of mine tailing waste residue and preparation method thereof, this wall body brick has the low characteristics of production cost.
To achieve these goals, the technical solution used in the present invention is: the novel wall brick that utilizes fluorgypsum and mine tailing waste residue to make, it is characterized in that it is prepared from by solid material, activity excitant and water, activity excitant is 0.2～0.4% of solid material total mass, and water is 10～15% of solid material and activity excitant total mass;
Described solid material is made up of fluorgypsum, mine tailing waste residue, other aggregate and basic material, the shared mass percent of each raw material is in the solid material: fluorgypsum 20%～60%, mine tailing waste residue 20%～44.5%, other aggregate 10%～30%, basic material 5～10%.
Used fluorgypsum, requiring radionuclide to limit the quantity of to meet GB6566-2001 standard-required, fineness is 0.2 to tail over less than 10% (quality).
Described mine tailing waste residue can be any one or any mixture more than two kinds in vanadium titanium mine tailing (being the vanadium titano-magnetite mine tailing), fluorite mine tailing (fluorite ore deposit mine tailing), the iron tailings etc., any is any proportioning when (containing any two kinds) more than two kinds and mixing, its particle is less than 3mm, and water ratio is less than 10wt%.
Described other aggregate can be any one or any mixture more than two kinds in heavy blast furnace slag, zeolite, Wingdale, the cobble etc., and any is any proportioning when (containing any two kinds) more than two kinds and mixing; Other aggregate is after broken classification, and particle diameter is less than 5mm.
Described basic material can be any one or any mixture more than two kinds in carbide slag, alkaline residue, unslaked lime, the calcium hydroxide etc., and any is any proportioning when (containing any two kinds) more than two kinds and mixing.
Described activity excitant is Sulfates exciting agent (sulphate activation agent), sylvite series exciting agent, calcined alunite breeze, calcine any one or the mixing more than two kinds in industrial alunite, the transition metal sulfate, is any proportioning during mixing more than two kinds.
The preparation of above-mentioned novel wall brick (manufacturing) method is characterized in that it comprises the steps:
1), raw material handles: fluorgypsum and other aggregate according to the necessary requirement fragmentation, are sieved or ball milling, standby;
2), fluorgypsum, mine tailing waste residue, other aggregate, basic material are mixed, stir (obtain solid material, or claim siccative) joins the activity excitant that is dissolved in the water in the siccative that stirs then, and restir once obtains half-dried material;
The static digestion of the half-dried material 2h that 3) will stir adds above-mentioned material at last and is pressed into adobe through machinery, leave standstill 1d, watering maintenance 10d, and natural curing obtains the novel wall brick to 28d again.
With respect to prior art, the invention has the beneficial effects as follows:
1, eat the quantity of slag big (fluorgypsum and mine tailing waste residue amount can account for more than 80% of brick physique amount), with low cost, do not produce secondary pollution in the production process, protected environment.
2, preparation technology of the present invention adopts semidrying compression moulding, adopts watering, natural curing after the moulding, and is simple to operate, with low cost, is fit to suitability for industrialized production fully.
3, the wall body brick ultimate compression strength that makes of the present invention is big, can reach more than the 20MPa.Every endurance quality, as water tolerance, frost resistance, volume stability, anti-carbonizations etc. can both be satisfied request of national standard.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
Embodiment 1
The novel wall brick (or claiming the fluorgypsum non-evaporating brick) that utilizes fluorgypsum and mine tailing waste residue to make, it is prepared from by solid material, activity excitant and water, activity excitant is 0.3% of solid material total mass, and water is 10% of solid material and activity excitant total mass; Described activity excitant is Sulfates exciting agent (metal sulfate class exciting agent).
Described solid material is made up of fluorgypsum, mine tailing waste residue, other aggregate and basic material, the shared mass percent of each raw material is in the solid material: fluorgypsum 40%, vanadium titanium mine tailing 20%, fluorite mine tailing 17.5% (vanadium titanium mine tailing and fluorite mine tailing constitute the mine tailing waste residue), heavy blast furnace slag (other aggregate) 17.5%, carbide slag (basic material) 5%.
Used fluorgypsum, requiring radionuclide to limit the quantity of to meet GB6566-2001 standard-required, fineness is 0.2 to tail over less than 10% (quality).
Described mine tailing waste residue is vanadium titanium mine tailing (being the vanadium titano-magnetite mine tailing) and fluorite mine tailing (fluorite ore deposit mine tailing), and its particle is less than 3mm, and water ratio is less than 10wt%.
Described other aggregate is heavy blast furnace slag; Other aggregate is after broken classification, and particle diameter is less than 5mm.
Described basic material is carbide slag.
The preparation of above-mentioned novel wall brick (manufacturing) method, it comprises the steps:
1), raw material handles: fluorgypsum and other aggregate according to the necessary requirement fragmentation, are sieved or ball milling, standby;
2), fluorgypsum, mine tailing waste residue, other aggregate, basic material are mixed, stir, then the activity excitant that is dissolved in the water is joined in the siccative that stirs, restir once obtains half-dried material;
The static digestion of the half-dried material 2h that 3) will stir adds above-mentioned material at last and is pressed into adobe (brick pressing machine is pressed into the 240*115*53mm standard square) through machinery, leave standstill 1d, watering maintenance 10d, and natural curing obtains the novel wall brick to 28d again.
Resulting novel wall brick, 28d folding strength 7.1MPa, 28d intensity 27MPa.Every endurance quality, as water tolerance, frost resistance, volume stability, anti-carbonizations etc. can both be satisfied request of national standard.
Embodiment 2
The novel wall brick that utilizes fluorgypsum and mine tailing waste residue to make, it is prepared from by solid material, activity excitant and water, and activity excitant is 0.4% of solid material total mass, and water is 10% of solid material and activity excitant total mass;
Described solid material is made up of fluorgypsum, mine tailing waste residue, other aggregate and basic material, the shared mass percent of each raw material is in the solid material: fluorgypsum 40%, vanadium titanium mine tailing 20%, fluorite mine tailing 24.5% (vanadium titanium mine tailing and fluorite mine tailing constitute the mine tailing waste residue), heavy blast furnace slag (other aggregate) 10.5%, unslaked lime (basic material) 5%.
Used fluorgypsum, requiring radionuclide to limit the quantity of to meet GB6566-2001 standard-required, fineness is 0.2 to tail over less than 10% (quality).
Described mine tailing waste residue is vanadium titanium mine tailing (being the vanadium titano-magnetite mine tailing) and fluorite mine tailing (fluorite ore deposit mine tailing), and its particle is less than 3mm, and water ratio is less than 10wt%.
Described other aggregate is heavy blast furnace slag; Other aggregate is after broken classification, and particle diameter is less than 5mm.
Described basic material is unslaked lime.
Described activity excitant is Sulfates exciting agent (double sulphate class exciting agent).
The preparation of above-mentioned novel wall brick (manufacturing) method, it comprises the steps:
1), raw material handles: fluorgypsum and other aggregate according to the necessary requirement fragmentation, are sieved or ball milling, standby;
2), fluorgypsum, mine tailing waste residue, other aggregate, basic material are mixed, stir, then the activity excitant that is dissolved in the water is joined in the siccative that stirs, restir once obtains half-dried material;
The static digestion of the half-dried material 2h that 3) will stir adds above-mentioned material at last and is pressed into adobe (brick pressing machine is pressed into the 240*115*53mm standard square) through machinery, leave standstill 1d, watering maintenance 10d, and natural curing obtains the novel wall brick to 28d again.
Resulting novel wall brick, 28d folding strength 8.2MPa, ultimate compression strength 30.7MPa.Every endurance quality, as water tolerance, frost resistance, volume stability, anti-carbonizations etc. can both be satisfied request of national standard.
Embodiment 3
The novel wall brick that utilizes fluorgypsum and mine tailing waste residue to make, it is prepared from by solid material, activity excitant and water, and activity excitant is 0.2% of solid material total mass, and water is 12% of solid material and activity excitant total mass;
Described solid material is made up of fluorgypsum, mine tailing waste residue, other aggregate and basic material, and the shared mass percent of each raw material is in the solid material: fluorgypsum 20%, mine tailing waste residue 40%, other aggregate 30%, basic material 10%.
Used fluorgypsum, requiring radionuclide to limit the quantity of to meet GB6566-2001 standard-required, fineness is 0.2 to tail over less than 10% (quality).
Described mine tailing waste residue is iron tailings, and its particle is less than 3mm, and water ratio is less than 10wt%.
Described other aggregate is zeolite; Other aggregate is after broken classification, and particle diameter is less than 5mm.
Described basic material is white lime (calcium hydroxide).
Described activity excitant is Sulfates exciting agent (transition metal sulfate class exciting agent).
The preparation of above-mentioned novel wall brick (manufacturing) method, it comprises the steps:
1), raw material handles: fluorgypsum and other aggregate according to the necessary requirement fragmentation, are sieved or ball milling, standby;
2), fluorgypsum, mine tailing waste residue, other aggregate, basic material are mixed, stir, then the activity excitant that is dissolved in the water is joined in the siccative that stirs, restir once obtains half-dried material;
The static digestion of the half-dried material 2h that 3) will stir adds above-mentioned material at last and is pressed into adobe through machinery, leave standstill 1d, watering maintenance 10d, and natural curing obtains the novel wall brick to 28d again.
Resulting novel wall brick, 28d folding strength 5.3MPa, ultimate compression strength 21.2MPa.Every endurance quality, as water tolerance, frost resistance, volume stability, anti-carbonizations etc. can both be satisfied request of national standard.
Embodiment 4
The novel wall brick that utilizes fluorgypsum and mine tailing waste residue to make, it is prepared from by solid material, activity excitant and water, and activity excitant is 0.4% of solid material total mass, and water is 15% of solid material and activity excitant total mass;
Described solid material is made up of fluorgypsum, mine tailing waste residue, other aggregate and basic material, and the shared mass percent of each raw material is in the solid material: fluorgypsum 60%, mine tailing waste residue 20%, other aggregate 10%, basic material 10%.
Used fluorgypsum, requiring radionuclide to limit the quantity of to meet GB6566-2001 standard-required, fineness is 0.2 to tail over less than 10% (quality).
Described mine tailing waste residue is the mixture of vanadium titanium mine tailing (being the vanadium titano-magnetite mine tailing), fluorite mine tailing (fluorite ore deposit mine tailing) and iron tailings, and quality respectively accounts for 1/3, and its particle is less than 3mm, and water ratio is less than 10wt%.
Described other bone is heavy blast furnace slag, zeolite, Wingdale and cobble, and quality respectively accounts for 1/4; Other aggregate is after broken classification, and particle diameter is less than 5mm.
Described basic material is carbide slag, alkaline residue and unslaked lime, and quality respectively accounts for 1/3.
Described activity excitant is transition metal sulfate and metal sulfate, and quality respectively accounts for 1/2.
The preparation of above-mentioned novel wall brick (manufacturing) method, it comprises the steps:
1), raw material handles: fluorgypsum and other aggregate according to the necessary requirement fragmentation, are sieved or ball milling, standby;
2), fluorgypsum, mine tailing waste residue, other aggregate, basic material are mixed, stir, then the activity excitant that is dissolved in the water is joined in the siccative that stirs, restir once obtains half-dried material;
The static digestion of the half-dried material 2h that 3) will stir adds above-mentioned material at last and is pressed into adobe through machinery, leave standstill 1d, watering maintenance 10d, and natural curing obtains the novel wall brick to 28d again.
Resulting novel wall brick, 28d folding strength 9.1MPa, ultimate compression strength 38.7MPa.Every endurance quality, as water tolerance, frost resistance, volume stability, anti-carbonizations etc. can both be satisfied request of national standard.
Embodiment 5
Substantially the same manner as Example 1, difference is: described activity excitant is sylvite series exciting agent.
Resulting novel wall brick, 28d folding strength 8.0MPa, ultimate compression strength 30MPa.Every endurance quality, as water tolerance, frost resistance, volume stability, anti-carbonizations etc. can both be satisfied request of national standard.
Embodiment 6
Substantially the same manner as Example 1, difference is: described activity excitant is the calcined alunite breeze.
Resulting novel wall brick, 28d folding strength 7.6MPa, ultimate compression strength 27MPa.Every endurance quality, as water tolerance, frost resistance, volume stability, anti-carbonizations etc. can both be satisfied request of national standard.
Embodiment 7
Substantially the same manner as Example 1, difference is: described activity excitant is the industrial alunite of calcining.
Resulting novel wall brick, 28d folding strength 7.6MPa, ultimate compression strength 27MPa.Every endurance quality, as water tolerance, frost resistance, volume stability, anti-carbonizations etc. can both be satisfied request of national standard.
Embodiment 8
Substantially the same manner as Example 1, difference is: described activity excitant is the industrial alunite of calcining and transition metal sulfate, and the quality of calcining industrial alunite and transition metal sulfate respectively accounts for 1/2.
Resulting novel wall brick, 28d folding strength 7.9MPa, ultimate compression strength 29MPa.Every endurance quality, as water tolerance, frost resistance, volume stability, anti-carbonizations etc. can both be satisfied request of national standard.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, 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 breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (5)
1. the novel wall brick that utilizes fluorgypsum and mine tailing waste residue to make, it is characterized in that it is prepared from by solid material, activity excitant and water, activity excitant is 0.2～0.4% of solid material total mass, and water is 10～15% of solid material and activity excitant total mass;
Described solid material is made up of fluorgypsum, mine tailing waste residue, aggregate and basic material, and the shared mass percent of each raw material is in the solid material: fluorgypsum 20%～60%, mine tailing waste residue 20%～44.5%, aggregate 10%～30%, basic material 5～10%;
Described mine tailing waste residue is any one or any mixture more than two kinds in vanadium titanium mine tailing, fluorite mine tailing, the iron tailings, and any is any proportioning when mixing more than two kinds, and its particle is less than 3mm, and water ratio is less than 10wt%;
Described activity excitant is Sulfates exciting agent, sylvite series exciting agent, calcined alunite breeze, calcine any one or the mixing more than two kinds in industrial alunite, the transition metal sulfate, is any proportioning during mixing more than two kinds;
Concrete preparation process is as follows:
1), raw material handles: fluorgypsum and aggregate according to the necessary requirement fragmentation, are sieved or ball milling, standby;
2), fluorgypsum, mine tailing waste residue, aggregate, basic material are mixed, stir, then the activity excitant that is dissolved in the water is joined in the siccative that stirs, restir once obtains half-dried material;
The static digestion of the half-dried material 2h that 3) will stir adds above-mentioned material at last and is pressed into adobe through machinery, leave standstill 1d, watering maintenance 10d, and natural curing obtains the novel wall brick to 28d again.
2. the novel wall brick that utilizes fluorgypsum and mine tailing waste residue to make according to claim 1 is characterized in that: used fluorgypsum, requiring radionuclide to limit the quantity of to meet GB6566-2001 standard-required, fineness is 0.2 to tail over less than 10%.
3. the novel wall brick that utilizes fluorgypsum and mine tailing waste residue to make according to claim 1, it is characterized in that: described aggregate is any one or any mixture more than two kinds in heavy blast furnace slag, zeolite, Wingdale, the cobble, and any is any proportioning when mixing more than two kinds; Aggregate is after broken classification, and particle diameter is less than 5mm.
4. the novel wall brick that utilizes fluorgypsum and mine tailing waste residue to make according to claim 1, it is characterized in that: described basic material is any one or any mixture more than two kinds in carbide slag, alkaline residue, unslaked lime, the calcium hydroxide, and any is any proportioning when mixing more than two kinds.
5. the preparation method of novel wall brick as claimed in claim 1 is characterized in that it comprises the steps:
1), raw material handles: fluorgypsum and aggregate according to the necessary requirement fragmentation, are sieved or ball milling, standby;
2), fluorgypsum, mine tailing waste residue, aggregate, basic material are mixed, stir, then the activity excitant that is dissolved in the water is joined in the siccative that stirs, restir once obtains half-dried material;
Described mine tailing waste residue is any one or any mixture more than two kinds in vanadium titanium mine tailing, fluorite mine tailing, the iron tailings, and any is any proportioning when mixing more than two kinds, and its particle is less than 3mm, and water ratio is less than 10wt%;
Described activity excitant is Sulfates exciting agent, sylvite series exciting agent, calcined alunite breeze, calcine any one or the mixing more than two kinds in industrial alunite, the transition metal sulfate, is any proportioning during mixing more than two kinds;
The static digestion of the half-dried material 2h that 3) will stir adds above-mentioned material at last and is pressed into adobe through machinery, leave standstill 1d, watering maintenance 10d, and natural curing obtains the novel wall brick to 28d again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110353092 CN102503339B (en) | 2011-11-09 | 2011-11-09 | Novel wall brick manufactured by utilizing fluorgypsum and tailing waste residues and preparation method for novel wall brick |
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| CN 201110353092 CN102503339B (en) | 2011-11-09 | 2011-11-09 | Novel wall brick manufactured by utilizing fluorgypsum and tailing waste residues and preparation method for novel wall brick |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102848460A (en) * | 2012-09-20 | 2013-01-02 | 浙江武义神龙浮选有限公司 | Method for producing autoclaved bricks by using fluorite tailings |
| CN102924032B (en) * | 2012-11-16 | 2014-01-08 | 郑建国 | Building polymerization powder and preparation method thereof |
| CN103102132B (en) * | 2013-01-04 | 2014-08-06 | 虞建放 | Building block made of blast furnace slag |
| CN103396080B (en) * | 2013-08-23 | 2015-10-21 | 张清 | A kind of wall body brick utilizing industrial residue to make and preparation method thereof |
| CN105541257A (en) * | 2016-01-29 | 2016-05-04 | 济南大学 | Fluorgypsum based floor tile and preparation method thereof |
| CN106986577A (en) * | 2017-05-03 | 2017-07-28 | 马振义 | A kind of homogeneous fireproof heated board of metal molybdenum mine tailing ground-slag and preparation method thereof |
| CN109650345B (en) * | 2018-04-09 | 2022-03-04 | 西南科技大学 | Method for respectively utilizing sulfur and calcium resources in gypsum |
| CN108752023B (en) * | 2018-06-15 | 2019-09-20 | 河北弘华节能科技有限公司 | A kind of far-infrared radiation element and preparation method thereof for Industrial Stoves |
| CN111302679B (en) * | 2020-03-02 | 2022-05-17 | 中国地质科学院矿产综合利用研究所 | Cement admixture containing vanadium titano-magnetite tailings and preparation method and application thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1955141A (en) * | 2005-10-28 | 2007-05-02 | 尹小林 | Manufacturing high-strength water-proof fire braking-free brick by industrial subgypsum |
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2011
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1955141A (en) * | 2005-10-28 | 2007-05-02 | 尹小林 | Manufacturing high-strength water-proof fire braking-free brick by industrial subgypsum |
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