CN104891919A - Phosphogypsum-based imitated cedar structure building material and preparation method thereof - Google Patents
Phosphogypsum-based imitated cedar structure building material and preparation method thereof Download PDFInfo
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- CN104891919A CN104891919A CN201510104206.3A CN201510104206A CN104891919A CN 104891919 A CN104891919 A CN 104891919A CN 201510104206 A CN201510104206 A CN 201510104206A CN 104891919 A CN104891919 A CN 104891919A
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Abstract
The invention discloses a phosphogypsum-based imitated cedar structure building material and a preparation method thereof. The phosphogypsum-based imitated cedar structure building material comprises the following raw materials in parts by weight: 210-290 parts of phosphogypsum, 190-230 parts of electrolyzed yellow phosphorus slag and 10-14 parts of quick lime. The preparation method comprises the steps of material preparing, ageing, forming, autoclave curing, phosphogypsum base material preparing, drying, spraying and finished product forming. The phosphogypsum-based imitated cedar structure building material has the characteristics of simple construction process, light weight, good waterproofness and fire resistance, high compressive strength, high bending strength and good weatherability; furthermore, the phosphogypsum-based imitated cedar structure building material as an indoor decorative building material has the excellent decoration effect; besides, a large amount of phosphogypsum is consumed, the exploitation of natural stones is reduced, and very important significance is provided for environmental protection and achievement of sustainable development.
Description
Technical field
The present invention relates to chemical building material field, be specifically related to a kind of phosphogypsum base and imitate China fir structural building material and preparation method thereof.
Background technology
Phosphogypsum Shi Lin compound fertilizer enterprise with phosphorus ore and sulfuric acid for major industry by product during raw material production phosphoric acid, wet method phosphoric acid manufacture process is all produce extraction slurry by sulfuric acid decomposition ground phosphate rock, then filter obtained phosphoric acid, in the process of filtration washing, produce phosphogypsum waste.
Along with the industry of phosphorus ammonium and the development of high-concentration phosphate compound fertilizers, the quantity discharged of phosphogypsum increases year by year, and the whole world increases phosphogypsum quantity discharged every year newly and reaches 2.8 hundred million tons at present, and about 5,000 ten thousand tons, China, accounts for 20% of world's phosphogypsum annual emissions.A large amount of phosphogypsums is stacked, not only land occupation resource, tremendous economic burden is increased to enterprise, but also certain pollution can be caused to environment, China's phosphogypsum is not applied very well for a long time, and utilization ratio is only 10%, year utilization is only 400-500 ten thousand tons, the emission problem of phosphogypsum has become the important factor of restriction production of phosphate fertilizer, and therefore, the phosphogypsum comprehensive utilization technique developing a kind of practicality has great importance.
In the face of the needs of urgent phosphogypsum resource utilization recycling, many technology preparing material of construction based on phosphogypsum are just corresponding and go out.
The patent document being CN103274616 A as publication number discloses a kind of method that phosphorus plaster of Paris produced by phosphogypsum, that industrial residue phosphogypsum is less than 5% through pneumatic drier oven dry to water ratio, send in vapor stream mill again, industrial residue phosphogypsum is ground by vapor stream abrasive dust, after dehydration, accept through dust-precipitator, cooling, i.e. obtained phosphorus plaster of Paris, the method with industrial waste phosphogypsum for starting material, the vapor stream that the superheated vapour utilizing industrial exhaust heat to produce is power grinds standby phosphorus plaster of Paris, there are starting material extensive, production unit is simple, output is high, cost is low, production is tending towards the features such as large-scale, obtained phosphorus plaster of Paris can be used for preparation building function mortar, also can be used for producing gypsum sheet material and building block, practical.
And for example publication number is that the patent document of CN1872765A discloses a kind of method utilizing producing building powdered gypsum by using phosphogypsum, its technological process is: calcine sending in continuous efficient calcining kiln behind pre-for phosphogypsum slag all stockyards, kiln discharge, 100-200 order powder is worn under field conditions (factors) after Chen Hua 7-15 days, the method has broken away from the old road will utilized after phosphogypsum washing in traditional technology, avoid the secondary pollution of environment and water, saving water resource, and the terra alba meeting national standard can be produced.
Also there is the technology utilizing phosphogypsum to prepare building thermal insulation material to occur simultaneously, but but do not see and to occur for the technical scheme of imitated China fir structure about utilizing phosphogypsum to prepare in material of construction process.
Therefore the present inventor is by large quantifier elimination and experiment, utilize phosphogypsum for main raw material, by after processing at its surface spraying paint similar to China fir lines or coating, produce material of construction identical with China fir in appearance, alternatively a kind of material of construction of China fir.
Summary of the invention
For solving the above-mentioned technical problem existed in prior art, the invention provides a kind of phosphogypsum base and imitating China fir structural building material and preparation method thereof.
The present invention is achieved by the following technical programs:
China fir structural building material imitated by a kind of phosphogypsum base, and it is made up of following raw material: phosphogypsum 210-290 part, electrolysis yellow phosphorus furnace slag 190-230 part, unslaked lime 10-14 part.
Described phosphogypsum base is imitated China fir structural building material and is made up of following raw material: phosphogypsum 230-270 part, electrolysis yellow phosphorus furnace slag 200-220 part, unslaked lime 11-13 part.
Described phosphogypsum base is imitated China fir structural building material and is made up of following raw material: phosphogypsum 250 parts, electrolysis yellow phosphorus furnace slag 210 parts, unslaked lime 12 parts.
Described phosphogypsum base to be imitated in China fir structural building material also containing by ripe brown 28 parts, raw brown 20 parts, the coating with China fir wood grain color that forms of He Shi 23 parts, 20 parts, gasoline, alkyd varnish 21 parts.
CaSO in described phosphogypsum
42H
2o content>=91%.
P in described phosphogypsum
2o
5content≤3%.
Present invention also offers the preparation method that China fir structural building material imitated by above-mentioned phosphogypsum base, the method comprises the following steps:
(1) prepare burden: get after phosphogypsum and unslaked lime is the ratio neutralizing treatment 1min of 21:1 according to mass ratio, put into stirrer and stir 30s, then stirrer is opened, add electrolysis yellow phosphorus furnace slag to continue to stir 60s, obtain mixture, after again mixture being dried to free-water≤1%, put into ball mill grinding 40-50min;
(2) ageing: the mixture in step (1) after ball milling is carried out ageing after the temperature lower calcination 3-4h of 140-160 DEG C, digestion time is 24-36h;
(3) shaping: the material after ageing is put into vibrating forming machine, shaping according to required shaped vibration;
(4) steam press maintenance: after the material natural curing 7-9d of vibratory compaction, carry out steam press maintenance, adopt heat-up rate to be 20 DEG C/h, control temperature is 120-180 DEG C, and pressure is 0.2-0.8MPa, and curing time is 5-8h;
(5) phosphogypsum base material: take out the material through steam press maintenance, namely obtains phosphogypsum base material after naturally cooling cooling;
(6) dry: phosphogypsum base material to be put into drying machine and is dried to water content≤7%;
(7) spray: get the coating with China fir wood grain color, uniformly spray on phosphogypsum base material, altogether spraying twice;
(8) finished product: by the phosphogypsum base material sprayed, puts into the kiln that temperature is 25 DEG C, namely obtains phosphogypsum base and imitate China fir structural building material finished product after dry 12-24h.
It is 275-280m that described mixture is milled to specific surface area
2/ kg.
Temperature in described drying process controls as 50-70 DEG C.
The coating thickness of described coating is 0.2-3.2mm.
Compared with prior art, the technique effect of technical scheme of the present invention is embodied in:
1. owing to containing much impurity and objectionable impurities in phosphogypsum, therefore the acidic substance of the present invention by adding in unslaked lime and in phosphogypsum, phosphogypsum is made to become neutrality, the various impurity in phosphogypsum are made to remove and reduce the content of objectionable impurities, become the secondary resource that can use, ball milling is carried out after mixing with electrolysis yellow phosphorus furnace slag again, by ball milling, the plate morphology of the dihydrate gypsum crystal rule in phosphogypsum and uniform scaling are destroyed, its granule-morphology is made to be column, tabular, granular variation such as grade, the grain composition improving phosphogypsum with this is normal distribution.
2. high-temperature calcination is carried out by through neutralization and the material of ball-milling processing, can effectively by P wherein
2o
5resolve into gas or be partially converted to stable insoluble phosphate compounds, do not need washing, avoid the problem of water pollutions, rear side which fits ageing makes its physicals be further improved.
3. frost resistance, the splitting resistance that steam press maintenance can improve material is carried out to the material after shaping, after its maintenance completes, carry out being drying to obtain high-level phosphogypsum base material.
4. carry out attached look by the mode of spraying, the decorative effect that the phosphogypsum base prepared can be made to imitate China fir structural building material obtains huge raising, adopts twice spraying, makes the outward appearance of material more evenly exquisite, and is not easy to fade and fades.
This phosphogypsum base is imitated China fir structural building material and is had that construction technology is simple, lightweight, waterproof fireproofing are good, ultimate compression strength is high in a word; the feature that High anti bending strength, weathering resistance are strong; and as upholstery building materials, there is good decorative effect; also consume a large amount of phosphogypsum simultaneously, reduce the exploitation of natural timber, to protection of the environment, realize Sustainable development tool and be of great significance.
Accompanying drawing explanation
Fig. 1 is present invention process schema.
Fig. 2 is that calcining temperature affects schematic diagram to phosphogypsum intensity
Fig. 3 is that calcining temperature affects schematic diagram to phosphogypsum coefficient of softening
Embodiment
Below in conjunction with drawings and Examples, technical scheme of the present invention is further described, but described in claimed scope is not limited to.
Embodiment one
Formula: phosphogypsum 210kg, electrolysis yellow phosphorus furnace slag 190kg, unslaked lime 10kg, ripe brown 28kg, raw brown 20kg, He Shi 23kg, gasoline 20kg, alkyd varnish 21kg.
Preparation method:
Get after phosphogypsum and unslaked lime is the ratio neutralizing treatment 1min of 21:1 according to mass ratio, put into stirrer and stir 30s, then stirrer is opened, add electrolysis yellow phosphorus furnace slag to continue to stir 60s, obtain mixture, after again mixture being dried to free-water≤1%, put into ball mill grinding 40min, being milled to specific surface area is 275m
2/ kg; Mixture after ball milling is carried out ageing after the temperature lower calcination 3h of 140 DEG C, and digestion time is 24h; Material after ageing is put into vibrating forming machine, shaping according to required shaped vibration; After the material natural curing 7d of vibratory compaction, carry out steam press maintenance, adopt heat-up rate to be 20 DEG C/h, control temperature is 120 DEG C, and pressure is 0.2MPa, and curing time is 5h; Take out the material through steam press maintenance, after naturally cooling cooling, namely obtain phosphogypsum base material; Phosphogypsum base material is put into drying machine, and control temperature is 50 DEG C and is dried to water content≤7%; Get ripe brown, raw brown, add gasoline again after He Shi mixes, alkyd varnish carries out diluting the coating obtaining having China fir wood grain color, is uniformly sprayed by this coating on phosphogypsum base material, spraying twice altogether, and coating thickness is 0.2mm; By the phosphogypsum base material sprayed, put into the kiln that temperature is 25 DEG C, namely obtain phosphogypsum base after dry 12h and imitate China fir structural building material finished product.
Embodiment two
Formula: phosphogypsum 290kg, electrolysis yellow phosphorus furnace slag 230kg, unslaked lime 14kg, ripe brown 28kg, raw brown 20kg, He Shi 23kg, gasoline 20kg, alkyd varnish 21kg.
Preparation method:
Get after phosphogypsum and unslaked lime is the ratio neutralizing treatment 1min of 21:1 according to mass ratio, put into stirrer and stir 30s, then stirrer is opened, add electrolysis yellow phosphorus furnace slag to continue to stir 60s, obtain mixture, after again mixture being dried to free-water≤1%, put into ball mill grinding 42min, being milled to specific surface area is 275m
2/ kg; Mixture after ball milling is carried out ageing after the temperature lower calcination 3h of 142 DEG C, and digestion time is 26h; Material after ageing is put into vibrating forming machine, shaping according to required shaped vibration; After the material natural curing 7d of vibratory compaction, carry out steam press maintenance, adopt heat-up rate to be 20 DEG C/h, control temperature is 130 DEG C, and pressure is 0.2MPa, and curing time is 5h; Take out the material through steam press maintenance, after naturally cooling cooling, namely obtain phosphogypsum base material; Phosphogypsum base material is put into drying machine, and control temperature is 54 DEG C and is dried to water content≤7%; Get ripe brown, raw brown, add gasoline again after He Shi mixes, alkyd varnish carries out diluting the coating obtaining having China fir wood grain color, is uniformly sprayed by this coating on phosphogypsum base material, spraying twice altogether, and coating thickness is 0.6mm; By the phosphogypsum base material sprayed, put into the kiln that temperature is 25 DEG C, namely obtain phosphogypsum base after dry 14h and imitate China fir structural building material finished product.
Embodiment three
Formula: phosphogypsum 230kg, electrolysis yellow phosphorus furnace slag 200kg, unslaked lime 11kg, ripe brown 28kg, raw brown 20kg, He Shi 23kg, gasoline 20kg, alkyd varnish 21kg.
Preparation method:
Get after phosphogypsum and unslaked lime is the ratio neutralizing treatment 1min of 21:1 according to mass ratio, put into stirrer and stir 30s, then stirrer is opened, add electrolysis yellow phosphorus furnace slag to continue to stir 60s, obtain mixture, mixture is put into ball mill grinding 47min again, being milled to specific surface area is 277m
2/ kg; Mixture after ball milling is carried out ageing after the temperature lower calcination 4h of 148 DEG C, and digestion time is 32h; Material after ageing is put into vibrating forming machine, shaping according to required shaped vibration; After the material natural curing 9d of vibratory compaction, carry out steam press maintenance, adopt heat-up rate to be 20 DEG C/h, control temperature is 170 DEG C, and pressure is 0.4MPa, and curing time is 8h; Take out the material through steam press maintenance, after naturally cooling cooling, namely obtain phosphogypsum base material; Phosphogypsum base material is put into drying machine, and control temperature is 62 DEG C and is dried to water content≤7%; Get ripe brown, raw brown, add gasoline again after He Shi mixes, alkyd varnish carries out diluting the coating obtaining having China fir wood grain color, is uniformly sprayed by this coating on phosphogypsum base material, spraying twice altogether, and coating thickness is 1.8mm; By the phosphogypsum base material sprayed, put into the kiln that temperature is 25 DEG C, namely obtain phosphogypsum base after dry 20h and imitate China fir structural building material finished product.
Embodiment four
Formula: phosphogypsum 270kg, electrolysis yellow phosphorus furnace slag 220kg, unslaked lime 13kg, ripe brown 28kg, raw brown 20kg, He Shi 23kg, gasoline 20kg, alkyd varnish 21kg.
Preparation method:
Get after phosphogypsum and unslaked lime is the ratio neutralizing treatment 1min of 21:1 according to mass ratio, put into stirrer and stir 30s, then stirrer is opened, add electrolysis yellow phosphorus furnace slag to continue to stir 60s, obtain mixture, after again mixture being dried to free-water≤1%, put into ball mill grinding 48min, being milled to specific surface area is 277m
2/ kg; Mixture after ball milling is carried out ageing after the temperature lower calcination 4h of 152 DEG C, and digestion time is 31h; Material after ageing is put into vibrating forming machine, shaping according to required shaped vibration; After the material natural curing 9d of vibratory compaction, carry out steam press maintenance, adopt heat-up rate to be 20 DEG C/h, control temperature is 180 DEG C, and pressure is 0.6MPa, and curing time is 8h; Take out the material through steam press maintenance, after naturally cooling cooling, namely obtain phosphogypsum base material; Phosphogypsum base material is put into drying machine, and control temperature is 64 DEG C and is dried to water content≤7%; Get ripe brown, raw brown, add gasoline again after He Shi mixes, alkyd varnish carries out diluting the coating obtaining having China fir wood grain color, is uniformly sprayed by this coating on phosphogypsum base material, spraying twice altogether, and coating thickness is 2.4mm; By the phosphogypsum base material sprayed, put into the kiln that temperature is 25 DEG C, namely obtain phosphogypsum base after dry 21h and imitate China fir structural building material finished product.
Embodiment five
Formula: phosphogypsum 250kg, electrolysis yellow phosphorus furnace slag 210kg, unslaked lime 12kg, ripe brown 28kg, raw brown 20kg, He Shi 23kg, gasoline 20kg, alkyd varnish 21kg.
Preparation method:
Get after phosphogypsum and unslaked lime is the ratio neutralizing treatment 1min of 21:1 according to mass ratio, put into stirrer and stir 30s, then stirrer is opened, add electrolysis yellow phosphorus furnace slag to continue to stir 60s, obtain mixture, after again mixture being dried to free-water≤1%, put into ball mill grinding 45min, being milled to specific surface area is 280m
2/ kg; Mixture after ball milling is carried out ageing after the temperature lower calcination 3.5h of 150 DEG C, and digestion time is 30h; Material after ageing is put into vibrating forming machine, shaping according to required shaped vibration; After the material natural curing 8d of vibratory compaction, carry out steam press maintenance, adopt heat-up rate to be 20 DEG C/h, control temperature is 150 DEG C, and pressure is 0.5MPa, and curing time is 5-8h; Take out the material through steam press maintenance, after naturally cooling cooling, namely obtain phosphogypsum base material; Phosphogypsum base material is put into drying machine, and control temperature is 60 DEG C and is dried to water content≤7%; Get ripe brown, raw brown, add gasoline again after He Shi mixes, alkyd varnish carries out diluting the coating obtaining having China fir wood grain color, is uniformly sprayed by this coating on phosphogypsum base material, spraying twice altogether, and coating thickness is 1.7mm; By the phosphogypsum base material sprayed, put into the kiln that temperature is 25 DEG C, namely obtain phosphogypsum base after dry 18h and imitate China fir structural building material finished product.
Below in conjunction with specific experiment example, product effect of the present invention is described further
Experimental example one
Carry out radio-activity testing according to GB6566-2001 " radioactive material radionuclides limitation " to the phosphogypsum base material prepared in the present invention, its test result is as shown in table 1:
Table 1 phosphogypsum base material radio-activity testing result
External Exposure Index: I
ra=CRa/200
Outreach services: Ir=CRa/370+CTh/260+CK/4200
Standard specifies, the radioactive activity of Natural Radionuclides of Building Materials radium-226, thorium-232, kalium-40 meets I simultaneously
ra≤ 1.0 and Ir≤1.0, its production and marketing and use range unrestricted, the phosphogypsum base material in the present invention meets within the scope that GB allows.
Experimental example two
Test the phosphogypsum base material prepared by phosphogypsum, electrolysis yellow phosphorus furnace slag, unslaked lime, compare intensity and the water resistance of phosphogypsum base material, its result is as shown in table 2:
The performance of phosphogypsum base material prepared by the raw material of table 2 different-grain diameter
| Numbering | W/C | Folding strength/MPa | Ultimate compression strength/MPa | Coefficient of softening | Water-intake rate |
| 1 | 0.25 | 3.5 | 15.6 | 0.67 | 0.18 |
| 2 | 0.26 | 3.9 | 17.4 | 0.75 | 0.17 |
| 3 | 0.26 | 4.1 | 17.5 | 0.78 | 0.16 |
| 4 | 0.27 | 3.7 | 18.3 | 0.71 | 0.17 |
| 5 | 0.28 | 3.4 | 20.9 | 0.83 | 0.16 |
As can be seen from Table 2 along with the reduction of the raw material particle size of phosphogypsum base material, each hardenite ultimate compression strength is significantly in increasing trend, illustrate that the size of feed particles affects the mechanical property of phosphogypsum base material significantly, the ultimate compression strength of No. 1 sample is 15.6MPa, and No. 5 samples under identical shaping and conservation system, the ultimate compression strength in the identical length of time exceeds 5.3MPa than No. 1 sample, and folding strength change is little, all fluctuate at about 3.7MPa, and contrast water-intake rate variation tendency, find water-intake rate only slight fluctuations about 17%, and not with the associating of raw material particle size Formation rule, and coefficient of softening is along with the reduction of raw material particle size is in ascendant trend slowly, therefore phosphogypsum base material is prepared by the raw material after ball-milling processing, ultimate compression strength has further lifting.
Experimental example three
Difference for the Feedstock treating mode preparing phosphogypsum base material does Effect on Mechanical Properties experiment, and its result is as shown in table 3:
The different Feedstock treating mode of table 3 is on the impact preparing phosphogypsum substrate performance
| Processing mode | W/C | Folding strength/MPa | Ultimate compression strength/MPa |
| Original state does not neutralize in advance | 0.26 | 2.2 | 11.5 |
| Ball milling does not neutralize in advance | 0.29 | 2.6 | 14.9 |
| Original state neutralizes | 0.25 | 3.5 | 15.6 |
| Limestone vegetation adds ball milling | 0.28 | 4.2 | 20.9 |
Compare known to above-mentioned Different treatments gained intensity results, original state does not neutralize in advance compared with original state neutralizing treatment, that ultimate compression strength or folding strength the latter are apparently higher than the former, ball milling in advance neutralization and limestone vegetation add ball milling and can both improve its mechanical property significantly, and raw material coordinates ball milling to be improve its mechanical property best mode by limestone vegetation process again.
Experimental example four
The formula chosen in the present invention calcines 4h respectively at different temperatures, ageing, and after shaping again after steam press maintenance, test its physical and mechanical property, its result as shown in Figure 2 and Figure 3.
As can be seen from Fig. 2, Fig. 3, along with calcining temperature be increased to 150 DEG C time, its intensity and coefficient of softening in rising trend, illustrate when calcining temperature is 150 DEG C, its over-all properties is better, can ensure that conversion product major part can ensure again conversion rate faster for semi-hydrated gypsum, and as can be seen from the figure calcining temperature because of better lower than 180 DEG C.
In sum, phosphogypsum base of the present invention is imitated China fir structural building material indices and is all reached criterion of acceptability and be much better than criterion of acceptability, is a kind of excellent material of construction.
Claims (10)
1. a China fir structural building material imitated by phosphogypsum base, it is characterized in that: it is made up of following raw material: phosphogypsum 210-290 part, electrolysis yellow phosphorus furnace slag 190-230 part, unslaked lime 10-14 part.
2. China fir structural building material imitated by phosphogypsum base according to claim 1, it is characterized in that: described phosphogypsum base is imitated China fir structural building material and is made up of following raw material: phosphogypsum 230-270 part, electrolysis yellow phosphorus furnace slag 200-220 part, unslaked lime 11-13 part.
3. China fir structural building material imitated by phosphogypsum base according to claim 1, it is characterized in that: described phosphogypsum base is imitated China fir structural building material and is made up of following raw material: phosphogypsum 250 parts, electrolysis yellow phosphorus furnace slag 210 parts, unslaked lime 12 parts.
4. imitate China fir structural building material according to the arbitrary described phosphogypsum base of claim 1-3, it is characterized in that: described phosphogypsum base to be imitated in China fir structural building material also containing by ripe brown 28 parts, raw brown 20 parts, the coating with China fir wood grain color that forms of He Shi 23 parts, 20 parts, gasoline, alkyd varnish 21 parts.
5. imitate China fir structural building material according to the arbitrary described phosphogypsum base of claim 1-3, it is characterized in that: CaSO in described phosphogypsum
42H
2o content>=91%.
6. imitate China fir structural building material according to the arbitrary described phosphogypsum base of claim 1-3, it is characterized in that: P in described phosphogypsum
2o
5content≤3%.
7. a preparation method for China fir structural building material imitated by the phosphogypsum base as described in as arbitrary in claim 1-3, it is characterized in that: the method comprises the following steps:
(1) prepare burden: get after phosphogypsum and unslaked lime is the ratio neutralizing treatment 1min of 21:1 according to mass ratio, put into stirrer and stir 30s, then stirrer is opened, add electrolysis yellow phosphorus furnace slag to continue to stir 60s, obtain mixture, after again mixture being dried to free-water≤1%, put into ball mill grinding 40-50min;
(2) ageing: the mixture in step (1) after ball milling is carried out ageing after the temperature lower calcination 3-4h of 140-160 DEG C, digestion time is 24-36h;
(3) shaping: the material after ageing is put into vibrating forming machine, shaping according to required shaped vibration;
(4) steam press maintenance: after the material natural curing 7-9d of vibratory compaction, carry out steam press maintenance, adopt heat-up rate to be 20 DEG C/h, control temperature is 120-180 DEG C, and pressure is 0.2-0.8MPa, and curing time is 5-8h;
(5) phosphogypsum base material: take out the material through steam press maintenance, namely obtains phosphogypsum base material after naturally cooling cooling;
(6) dry: phosphogypsum base material to be put into drying machine and is dried to water content≤7%;
(7) spray: get the coating with China fir wood grain color, uniformly spray on phosphogypsum base material, altogether spraying twice;
(8) finished product: by the phosphogypsum base material sprayed, puts into the kiln that temperature is 25 DEG C, namely obtains phosphogypsum base and imitate China fir structural building material finished product after dry 12-24h.
8. the preparation method of China fir structural building material imitated by phosphogypsum base according to claim 6, it is characterized in that: it is 275-280m2/kg that described mixture is milled to specific surface area.
9. the preparation method of China fir structural building material imitated by phosphogypsum base according to claim 6, it is characterized in that: the temperature in described drying process controls as 50-70 DEG C.
10. the preparation method of China fir structural building material imitated by phosphogypsum base according to claim 6, it is characterized in that: the coating thickness of described coating is 0.2-3.2mm.
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