CN108793115A - A method of using ammonium chloride decomposing phosphate rock and preparing fiber cement board using impurity - Google Patents
A method of using ammonium chloride decomposing phosphate rock and preparing fiber cement board using impurity Download PDFInfo
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- CN108793115A CN108793115A CN201810609316.9A CN201810609316A CN108793115A CN 108793115 A CN108793115 A CN 108793115A CN 201810609316 A CN201810609316 A CN 201810609316A CN 108793115 A CN108793115 A CN 108793115A
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- ammonium chloride
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- phosphate rock
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/32—Phosphates of magnesium, calcium, strontium, or barium
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/32—Phosphates of magnesium, calcium, strontium, or barium
- C01B25/327—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0481—Other specific industrial waste materials not provided for elsewhere in C04B18/00
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The present invention relates to industrial solid wastes to utilize technical field, specifically a kind of method that fiber cement board is prepared using ammonium chloride decomposing phosphate rock and using impurity.The present invention is in CaCl2Sub-molten salt system, as stealthy acid medium, using ground phosphate rock as raw material, is reacted with ammonium chloride in calcium chloride sub-molten salt system using ammonium chloride and generates coarse whiting product and release CO2Gas and NH3Gas, no sulfuric acid consumption and ardealite discharge, and SiO will be contained2·nH2The lower double superhosphate of purity of O impurity is dissolved in hydrochloric acid, precipitation and filtrate is collected, by SiO2·nH2O precipitations are placed in CaCl2In sub-molten salt, it is passed through ammonia, after 140 DEG C or more fully reaction, obtains calcium silicates, the NH that decomposing phosphate rock can also be obtained3Gas collection uses SiO after purification2·nH2O prepares calcium silicates.The present invention is a kind of no sulfuric acid consumption and ardealite discharge, the method that fiber cement board is prepared using ammonium chloride decomposing phosphate rock and using impurity that the impurity in phosphorus ore is made full use of.
Description
Technical field
It is specifically a kind of to use ammonium chloride decomposing phosphate rock and prepared using impurity the present invention relates to phosphorus ore processing technology field
The method of fiber cement board.
Background technology
Traditional coarse whiting uses " addition " production technology, often produces 1 ton of coarse whiting and at least needs to consume 0.46 ton of sulfuric acid, generates
0.93 ton of ardealite.
Ardealite is the industrial residue of generation during Wet-process Phosphoric Acid Production.1 ton of phosphoric acid is often produced (with P2O5Meter), generally
Generate 4-5 tons of ardealites.The main component of ardealite is calcium sulphate dihydrate or half-H 2 O calcium sulphate, and containing a small amount of quartz, not
Apatite, the water solubility P of decomposition2O5, insoluble P2O5, eutectic P2O5, fluoride and fluorine, aluminium, the phosphate of magnesium and sulfate etc..
Ardealite delays (tune) and coagulates agent, building gypsum plaster, Thistle board, fiber mainly for the production of building material, including cement at present
Plasterboard and pit filler and road foundation material etc..Due in ardealite titanium pigment, fluorine and other impurity to phosphorus stone
Cream building material performance has an adverse effect, such as the extension of gypsum setting time, hardenite strength reduction, crystal structure are loose,
And its water content is high, and thus causing ardealite to prepare, building material poor quality, added value are low, market transportation radius is short.This
Outside, the solubility product due to calcium sulfate and calcium carbonate in ammonium sulfate differs more than 3000 times, and calcium sulfate is easy to pass through carbonating
Reaction process is converted into solid product calcium carbonate and synchronous production ammonium sulfate liquor, and ammonium sulfate liquor can also be further inverted
Prepare the sulfenyls compound fertilizer product such as potassium sulfate and ammonium chloride potassium.However, on the one hand since the impurity almost all in ardealite enters
In solid product, thus lead to that gained calcium carbonate product particle is tiny, purity and whiteness are poor, added value is low, it is difficult to extensive sharp
With；On the other hand, the calcium sulfate in ardealite needs to consume a large amount of ammonia after being converted into calcium carbonate, and the ammonia consumed finally converts
For the low value-added product such as ammonium sulfate or ammonium chloride, overall technology economy difficulty is thus caused to reach a standard.
Based on this, for a large amount of ardealites of attached production and ardealite carbonic acid in existing traditional dihydrate wet phosphoric acid extraction process
Change conversion and prepare the bad outstanding problem of calcium carbonate Technical Economy, it is therefore desirable to find a kind of no ardealite generation phosphorite stope
Method.
Due to containing a certain amount of silicon in phosphorus ore, with the acid formed after sour decomposing phosphate rock based on silica and calcium silicates
Insoluble slag influences the quality of solid product, and after being separated off, usually does waste treatment, fails to make full use of.
To sum up, a kind of energy decomposing phosphate rock is found, no ardealite generates, and decomposing phosphate rock is made full use of to generate, and contains
The method of sour insoluble slag of element silicon be the task of top priority.
Invention content
In order to solve the above technical problems existing in the prior art, present invention offer is a kind of using ammonium chloride decomposing phosphate rock
And the method for using impurity preparing fiber cement board, include the following steps：
(1) it is mixed with ammonium chloride solution after smashing phosphorus ore, stirs slurrying；
(2) phosphorus ore slurry is added to CaCl2In sub-molten salt, reacted；
(3) fully add water to be diluted into reactant after reaction, discharge, filtering respectively obtains filtrate and filter cake；
(4) dechlorination is washed with water in filter cake, then filter cake is dried, obtain crossing phosphorus again with sour insoluble slag impurity
Sour calcium；
(5) the obtained double superhosphate with sour insoluble slag impurity is added to the water, stirs slurrying, salt is added thereto
Acid is reacted；
(6) it after it is fully reacted after slurries, is filtered, respectively obtains filtrate and filter cake,
(7) filter cake is cleaned, it is uniform with water, wood-fibred, cement mixing, it is reacted in 160-200 DEG C；
(8) fully water is filtered out after reaction, obtains solid wet feed, solid wet feed is cut into required size, is then rested,
High pressure-temperature is steam-cured, cools down to get fiber cement board.
Preferably, the phosphorus ore is smashed, and is that phosphorus ore is broken into powder.The phosphorus ore for breaking into powder is easier to ammonium chloride solution
Reaction, makes reaction faster be more easy to slurrying.
Preferably, the ammonium chloride solution is supersaturated ammonium chloride solution.It is further preferred that the supersaturation ammonium chloride
Solution is 60 DEG C of supersaturated solution.The supersaturation ammonium chloride solution, is 60 DEG C of supersaturated solution.Supersaturated ammonium chloride
Solution contains more ammonium chloride, and can be supplemented in time after being reacted with ore by the ammonium chloride consumption in solution,
Chloride leach degree is larger in the case of 60 DEG C, and the ammonium chloride contained in supersaturated ammonium chloride solution is also more, and will not be because
Temperature is excessively high and the increase of ammonium chloride amount of hydrolysis is caused to cause damages.
Preferably, the CaCl2 sub-molten salts are stirred evenly after mixing CaCl2 with the water of its weight 50-150%, are risen
Temperature keeps stablizing to 170 DEG C -180 DEG C to obtain the final product.CaCl at this time2Sub-molten salt system is relatively stable.
Preferably, the step (2), it is during phosphorus ore slurry is added to CaCl2 sub-molten salts, phosphorus ore slurry is slow
It is added.Cause quickly to generate a large amount of foams to avoid due to phosphorus ore slurry rapidly joins, causes to overflow, and influence reaction speed.
Preferably, the step (2), reaction time control in 2h or more.It is carried out with reacting fully.
Preferably, described plus water is diluted, and is the water that reactant weight 15-40% is added.Dilution effect is preferable at this time,
Dosage is also relatively mild, will not cause solid product due to the more total amount for causing microsolubility substance to be dissolved in water of water is added and increases
Loss, solution impurity increase.
Preferably, the step (7), is reacted at 180 DEG C.Reaction speed is very fast at this time, and can promote production
The intensity and hardness of product.
Preferably, the step (7) is reacted under conditions of pH > 12.It can make dioxy under conditions of pH > 12
SiClx fully generates silicate with substance reactions such as ferrous oxide, aluminium oxide.
Preferably, the wood-fibred, cement additional proportion be the wood-fibred of filter cake weight 10-30%, filter cake weight respectively
Measure the cement of 50-180%.This proportioning is relatively mild, and the intensity of gained fiber cement board is preferable, and property is also more suitable.
The method of the present invention is in CaCl2Sub-molten salt system is used as stealthy acid medium using ammonium chloride, using ground phosphate rock as raw material,
It reacts to obtain containing with SiO with ammonium chloride in calcium chloride sub-molten salt system2·nH2The weight of sour insoluble slag impurity based on O
Calcium superphosphate simultaneously releases CO2Gas and NH3Gas, no sulfuric acid consumption and ardealite discharge, by the double superhosphate with impurity
In with SiO2·nH2Sour insoluble slag impurity based on O is separated, and can improve the purity of double superhosphate, and will be with
SiO2·nH2Sour insoluble slag impurity based on O is reacted so that fiber cement board is prepared jointly with water, wood-fibred, cement.
The key reaction equation of the present invention is as follows：
When phosphorus ore ammonium chloride decomposes：
2Ca5(PO4)3F+12NH4Cl=3Ca (H2PO4)2+CaF2+12NH3↑+6CaCl2
(reaction condition：160-180 DEG C, CaCl2Sub-molten salt system)
CaCO3+CaSiO3+2NH4Cl=2NH3↑+H2O+CaCl2+CO2↑+SiO2·2H2O
(reaction condition：160-180 DEG C, CaCl2Sub-molten salt system)
Ca (the H of generation are reacted at this time2PO4)2For microsolubility substance, SiO2·2H2O is insoluble substance, and step (3) obtains
Filter cake mainly by the two at being grouped as, cause the purity of double superhosphate not high, thus using free hydrochloric acid by filter cake into
Row separation, then in CaCl2Back reaction is carried out under sub-molten salt system status, improves the purity of double superhosphate, and by SiO2·nH2O
It separates, is used to prepare calcium silicates.
When double superhosphate with sour insoluble slag impurity is reacted with hydrochloric acid：
3Ca(H2PO4)2Sour insoluble slag+2HCl=2H3PO4+CaCl2+ acid insoluble slag ↓
(reaction condition：100 DEG C of <)
Wherein sour insoluble slag is mainly SiO2·nH2O。
To SiO2·nH2When sour insoluble slag based on O prepares fiber cement board：
FeO+Al2O3+SiO2·nH2O=FeSiO3+Al2(SiO3)3+nH2O
(reaction condition：PH > 12)
At this point, by the way that pH controls will be reacted in pH > 12, SiO can be made2·nH2O and FeO, Al2O3 are converted into FeSiO3、
Al2(SiO3)3With H2O。
Compared with prior art, the technique effect of the invention is embodied in：
The present invention is in CaCl2Sub-molten salt system is used as stealthy acid medium using ammonium chloride, using ground phosphate rock as raw material, in chlorination
It reacts to obtain containing with SiO with ammonium chloride in calcium sub-molten salt system2·nH2The heavy peroxophosphoric acid of sour insoluble slag impurity based on O
Calcium simultaneously releases CO2Gas and NH3Gas, no sulfuric acid consumption and ardealite discharge, by the double superhosphate with impurity with
SiO2·nH2Sour insoluble slag impurity based on O is separated, and can improve the purity of double superhosphate, and will be with SiO2·nH2O
Based on sour insoluble slag impurity reacted jointly fiber cement board is prepared with water, wood-fibred, cement.The present invention method without
Sulfuric acid consumption and ardealite discharge, and the impurity of generation is separated, and it is total as raw material and water, wood-fibred, cement using it
With reaction to prepare fiber cement board, eliminates traditional phosphorite stope process and consume a large amount of sulfuric acid and a large amount of ardealites is brought to arrange
The problem of putting, and the impurity in phosphorus ore is made full use of, is a kind of no sulfuric acid consumption and ardealite discharge, will be miscellaneous in phosphorus ore
The method that fiber cement board is prepared using ammonium chloride decomposing phosphate rock and using impurity that matter makes full use of.
Specific implementation mode
It is limited with reference to specific embodiment technical scheme of the present invention is further, but claimed
Range describes made by being not only limited to.
Embodiment 1
(1) 200g phosphorus ores are broken into after powder and are mixed with ammonium chloride solution, stir slurrying, the ammonium chloride solution is
230g ammonium chlorides are dissolved in the ammonium chloride saturated solution that 280ml water obtains at 60 DEG C；
(2) phosphorus ore slurry is added to CaCl2In sub-molten salt, 2h, the CaCl are reacted2Sub-molten salt is by 800gCaCl2
It is stirred evenly after being mixed with the water of its weight 100%, is warming up to 175 DEG C, keep stably obtaining；
(3) water that reactant weight 25% is added fully after reaction into reactant is diluted, and is discharged, is filtered, respectively
Obtain filtrate and filter cake；
(4) dechlorination is washed with water in filter cake, then filter cake is dried, obtained with SiO2·nH2Acid based on O
The double superhosphate of insoluble slag impurity；
(5) it will obtain with SiO2·nH2The double superhosphate of sour insoluble slag impurity based on O is added to the water, stirring
Hydrochloric acid is added in slurrying thereto, is reacted；
(6) it after it is fully reacted after slurries, is filtered, respectively obtains filtrate and filter cake,
(7) filter cake is cleaned, it is uniform with water, the wood-fibred of filter cake weight 20%, the cement mixing of filter cake weight 115%,
It is reacted in 180 DEG C；
(8) fully water is filtered out after reaction, obtains solid wet feed, solid wet feed is cut into required size, is then rested,
High pressure-temperature is steam-cured, cools down to get fiber cement board.
Embodiment 2
(1) 200g phosphorus ores are broken into after powder and are mixed with ammonium chloride solution, stir slurrying, the ammonium chloride solution is
230g ammonium chlorides are dissolved in the ammonium chloride supersaturated solution that 400ml water obtains at 40 DEG C；
(2) phosphorus ore slurry is added to CaCl2In sub-molten salt, 1h, the CaCl are reacted2Sub-molten salt is by 800gCaCl2
It is stirred evenly after being mixed with the water of its weight 50%, is warming up to 180 DEG C, keep stably obtaining；
(3) water that reactant weight 15% is added fully after reaction into reactant is diluted, and is discharged, is filtered, respectively
Obtain filtrate and filter cake；
(4) dechlorination is washed with water in filter cake, then filter cake is dried, obtained with SiO2·nH2Acid based on O
The double superhosphate of insoluble slag impurity；
(5) it will obtain with SiO2·nH2The double superhosphate of sour insoluble slag impurity based on O is added to the water, stirring
Hydrochloric acid is added in slurrying thereto, is reacted；
(6) it after it is fully reacted after slurries, is filtered, respectively obtains filtrate and filter cake,
(7) filter cake is cleaned, the cement mixing with water, the wood-fibred of filter cake weight 10-30%, filter cake weight 50-180%
Uniformly, it is reacted in 160-200 DEG C；
(8) fully water is filtered out after reaction, obtains solid wet feed, solid wet feed is cut into required size, is then rested,
High pressure-temperature is steam-cured, cools down to get fiber cement board.
Embodiment 3
(1) 200g phosphorus ores are broken into after powder and are mixed with ammonium chloride solution, stir slurrying, the ammonium chloride solution is
230g ammonium chlorides are dissolved in the ammonium chloride supersaturated solution that 230ml water obtains at 80 DEG C；
(2) phosphorus ore slurry is added to CaCl2In sub-molten salt, 3h, the CaCl are reacted2Sub-molten salt is by 800gCaCl2
It is stirred evenly after being mixed with the water of its weight 150%, is warming up to 170 DEG C, keep stably obtaining；
(3) water that reactant weight 40% is added fully after reaction into reactant is diluted, and is discharged, is filtered, respectively
Obtain filtrate and filter cake；
(4) dechlorination is washed with water in filter cake, then filter cake is dried, obtained with SiO2·nH2Acid based on O
The double superhosphate of insoluble slag impurity；
(5) it will obtain with SiO2·nH2The double superhosphate of sour insoluble slag impurity based on O is added to the water, stirring
Hydrochloric acid is added in slurrying thereto, is reacted；
(6) it after it is fully reacted after slurries, is filtered, respectively obtains filtrate and filter cake,
(7) filter cake is cleaned, the cement mixing with water, the wood-fibred of filter cake weight 10-30%, filter cake weight 50-180%
Uniformly, it is reacted in 160-200 DEG C；
(8) fully water is filtered out after reaction, obtains solid wet feed, solid wet feed is cut into required size, is then rested,
High pressure-temperature is steam-cured, cools down to get fiber cement board.
Embodiment 4
(1) 200g phosphorus ores are broken into after powder and are mixed with ammonium chloride solution, stir slurrying, the ammonium chloride solution is
230g ammonium chlorides are dissolved in the ammonium chloride saturated solution that 280ml water obtains at 60 DEG C；
(2) phosphorus ore slurry is slowly added into CaCl2In sub-molten salt, 2h, the CaCl are reacted2Sub-molten salt, be by
800gCaCl2It is stirred evenly after being mixed with the water of its weight 100%, is warming up to 175 DEG C, keep stably obtaining；
(3) water that reactant weight 25% is added fully after reaction into reactant is diluted, and is discharged, is filtered, respectively
Obtain filtrate and filter cake；
(4) dechlorination is washed with water in filter cake, then filter cake is dried, obtained with SiO2·nH2Acid based on O
The double superhosphate of insoluble slag impurity；
(5) it will obtain with SiO2·nH2The double superhosphate of sour insoluble slag impurity based on O is added to the water, stirring
Hydrochloric acid is added in slurrying thereto, is reacted；
(6) it after it is fully reacted after slurries, is filtered, respectively obtains filtrate and filter cake,
(7) filter cake is cleaned, it is uniform with water, the wood-fibred of filter cake weight 20%, the cement mixing of filter cake weight 115%,
It is reacted in 180 DEG C；
(8) fully water is filtered out after reaction, obtains solid wet feed, solid wet feed is cut into required size, is then rested,
High pressure-temperature is steam-cured, cools down to get fiber cement board.
Embodiment 5
(1) 200g phosphorus ores are broken into after powder and are mixed with ammonium chloride solution, stir slurrying, the ammonium chloride solution is
230g ammonium chlorides are dissolved in the ammonium chloride saturated solution that 280ml water obtains at 60 DEG C；
(2) phosphorus ore slurry is added to CaCl2In sub-molten salt, 2h, the CaCl are reacted2Sub-molten salt is by 800gCaCl2
It is stirred evenly after being mixed with the water of its weight 100%, is warming up to 175 DEG C, keep stably obtaining；
(3) water that reactant weight 25% is added fully after reaction into reactant is diluted, and is discharged, is filtered, respectively
Obtain filtrate and filter cake；
(4) dechlorination is washed with water in filter cake, then filter cake is dried, obtained with SiO2·nH2Acid based on O
The double superhosphate of insoluble slag impurity；
(5) it will obtain with SiO2·nH2The double superhosphate of sour insoluble slag impurity based on O is added to the water, stirring
Hydrochloric acid is added in slurrying thereto, is reacted；
(6) it after it is fully reacted after slurries, is filtered, respectively obtains filtrate and filter cake,
(7) filter cake is cleaned, it is uniform with water, the wood-fibred of filter cake weight 20%, the cement mixing of filter cake weight 115%,
It is reacted under conditions of 12,180 DEG C of pH >；
(8) fully water is filtered out after reaction, obtains solid wet feed, solid wet feed is cut into required size, is then rested,
High pressure-temperature is steam-cured, cools down to get fiber cement board.
By each embodiment it is found that the method for the present invention can be efficiently used with SiO2·nH2Sour insoluble slag impurity based on O, and
It is translated into calcium silicates.
Finally it is pointed out that above example is only the more representational example of the present invention.Obviously, technology of the invention
Scheme is not limited to above-described embodiment, and acceptable there are many deformations.Those skilled in the art can be from disclosed by the invention
All deformations that content is directly exported or associated, are considered as protection scope of the present invention.
Claims (10)
1. a kind of method preparing fiber cement board using ammonium chloride decomposing phosphate rock and using impurity, which is characterized in that including such as
Lower step：
(1) it is mixed with ammonium chloride solution after smashing phosphorus ore, stirs slurrying；
(2) phosphorus ore slurry is added to CaCl2In sub-molten salt, reacted；
(3) fully add water to be diluted into reactant after reaction, discharge, filtering respectively obtains filtrate and filter cake；
(4) dechlorination is washed with water in filter cake, then filter cake is dried, obtain the heavy peroxophosphoric acid with sour insoluble slag impurity
Calcium；
(5) the obtained double superhosphate with sour insoluble slag impurity is added to the water, stirs slurrying, hydrochloric acid is added thereto,
It is reacted；
(6) it after it is fully reacted after slurries, is filtered, respectively obtains filtrate and filter cake,
(7) filter cake is cleaned, it is uniform with water, wood-fibred, cement mixing, it is reacted in 160-200 DEG C；
(8) fully water is filtered out after reaction, obtains solid wet feed, solid wet feed is cut into required size, is then rested, high pressure
High-temperature steam curing cools down to get fiber cement board.
2. the method according to claim 1 that fiber cement board is prepared using ammonium chloride decomposing phosphate rock and using impurity,
It is characterized in that, the phosphorus ore is smashed, and is that phosphorus ore is broken into powder.
3. the method according to claim 1 that fiber cement board is prepared using ammonium chloride decomposing phosphate rock and using impurity,
It is characterized in that, the ammonium chloride solution is supersaturated ammonium chloride solution.
4. the method according to claim 3 that fiber cement board is prepared using ammonium chloride decomposing phosphate rock and using impurity,
It is characterized in that, the supersaturation ammonium chloride solution, is 60 DEG C of supersaturated solution.
5. the method according to claim 1 that fiber cement board is prepared using ammonium chloride decomposing phosphate rock and using impurity,
It is characterized in that, the CaCl2Sub-molten salt is by CaCl2It is stirred evenly after being mixed with the water of its weight 50-150%, is warming up to 170
It DEG C -180 DEG C, keeps stablizing to obtain the final product.
6. the method according to claim 1 that fiber cement board is prepared using ammonium chloride decomposing phosphate rock and using impurity,
It is characterized in that, phosphorus ore slurry is added to CaCl by the step (2)2During sub-molten salt, phosphorus ore slurry is slowly added to.
7. the method according to claim 1 that fiber cement board is prepared using ammonium chloride decomposing phosphate rock and using impurity,
It is characterized in that, described plus water is diluted, and is the water that reactant weight 15-40% is added.
8. the method according to claim 1 that fiber cement board is prepared using ammonium chloride decomposing phosphate rock and using impurity,
It is characterized in that, the step (7), is reacted at 180 DEG C.
9. the method according to claim 1 that fiber cement board is prepared using ammonium chloride decomposing phosphate rock and using impurity,
It is characterized in that, the step (7) is reacted under conditions of pH > 12.
10. the method according to claim 10 that fiber cement board is prepared using ammonium chloride decomposing phosphate rock and using impurity,
It is characterized in that, the additional proportion of the wood-fibred, cement is the wood-fibred of filter cake weight 10-30%, filter cake weight 50- respectively
180% cement.
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| CN85107209A (en) * | 1985-09-24 | 1986-05-10 | 陕西省化学肥料工业公司 | The low grade calcareous phosphorous ore fractionation |
| CN1285312A (en) * | 1999-08-22 | 2001-02-28 | 李怀然 | novel process for preparing fodder grade calcium hydrophosphate and by-product calcium carbonate and ammonium chloride by hydrochloric acid method |
| CN1962421A (en) * | 2006-11-19 | 2007-05-16 | 武善东 | Phosphorite acidolysis method |
| WO2010043262A1 (en) * | 2008-10-16 | 2010-04-22 | Ecophos Sa | Process for the production of high purity phosphoric acid |
| CN102659089A (en) * | 2012-04-25 | 2012-09-12 | 中国科学院过程工程研究所 | Producing method of calcium hydrogen phosphate |
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