CN108793115B - Method for decomposing phosphorite by using ammonium chloride and preparing fiber cement board by using impurities - Google Patents
Method for decomposing phosphorite by using ammonium chloride and preparing fiber cement board by using impurities Download PDFInfo
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- CN108793115B CN108793115B CN201810609316.9A CN201810609316A CN108793115B CN 108793115 B CN108793115 B CN 108793115B CN 201810609316 A CN201810609316 A CN 201810609316A CN 108793115 B CN108793115 B CN 108793115B
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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
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- 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
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- 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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- 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
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Abstract
The invention relates to the technical field of industrial solid waste utilization, in particular to a method for preparing a fiber cement board by decomposing phosphorite with ammonium chloride and using impurities. In the invention, CaCl2The molten salt system adopts ammonium chloride as a stealth acid medium, uses ground phosphate rock as a raw material, and reacts with the ammonium chloride in a calcium chloride molten salt system to generate a heavy calcium carbonate product and release CO2Gas and NH3Gas, no sulfuric acid consumption and phosphogypsum discharge, and will contain SiO2·nH2Dissolving the low-purity triple superphosphate containing O impurities in hydrochloric acid, collecting precipitate and filtrate, and dissolving SiO in the filtrate2·nH2Placing the O precipitate in CaCl2Introducing ammonia gas into the molten salt, reacting at 140 deg.C to obtain calcium silicate, and optionally decomposing phosphorus ore to obtain NH3Collecting and purifying gas for use in SiO2·nH2O preparing calcium silicate. The invention relates to a method for preparing a fiber cement board by decomposing phosphorite by using ammonium chloride and using impurities, which has no sulfuric acid consumption and phosphogypsum discharge and fully utilizes the impurities in the phosphorite.
Description
Technical Field
The invention relates to the technical field of phosphorite treatment, in particular to a method for preparing a fiber cement board by decomposing phosphorite with ammonium chloride and using impurities.
Background
The traditional heavy calcium adopts an additive production process, and at least 0.46 ton of sulfuric acid is consumed for producing 1 ton of heavy calcium, so that 0.93 ton of phosphogypsum is produced.
Phosphogypsum is industrial waste residue generated in the production process of wet-process phosphoric acid. For each 1 ton of phosphoric acid produced (in P)2O5Meter), typically 4-5 tons of phosphogypsum are produced. The main components of the phosphogypsum are calcium sulfate dihydrate or calcium sulfate hemihydrate, and a small amount of quartz, undecomposed apatite and water-soluble P2O5Insoluble P2O5Eutectic crystal P2O5Fluoride, and phosphate and sulfate salts of fluorine, aluminum, magnesium, and the like. At present, the phosphogypsum is mainly used for producing building material products, including cement retarder (setting retarder), building gypsum powder, paper-faced gypsum board, fiber gypsum board, pit filler, road bed material and the like. Soluble phosphorus, fluorine and other impurities in the phosphogypsum have adverse effects on the performance of a phosphogypsum building material product, such as prolonged gypsum setting time, reduced strength of a hardened body, loose crystal structure and the like, and the water content is high, so that the phosphogypsum prepared building material product has poor quality, low additional value and short market transportation radius. In addition, because the solubility products of calcium sulfate and calcium carbonate in ammonium sulfate differ by more than 3000 times, the calcium sulfate is easily converted into solid product calcium carbonate through the carbonation reaction process and synchronously produces ammonium sulfate mother liquor, and the ammonium sulfate mother liquor can be further converted to prepare sulfur-based compound fertilizer products such as potassium sulfate, ammonium chloride and the like. However, on the one hand, since the impurities in phosphogypsum go almost entirely intoThe calcium carbonate is added into a solid product, so that the obtained calcium carbonate product has fine particles, poor purity and whiteness and low added value and is difficult to utilize on a large scale; on the other hand, after calcium sulfate in phosphogypsum is converted into calcium carbonate, a large amount of ammonia needs to be consumed, and the consumed ammonia is finally converted into low value-added products such as ammonium sulfate or ammonium chloride, so that the overall technical economy is difficult to pass.
Based on this, aiming at the outstanding problems of large amount of phosphogypsum produced in the prior phosphoric acid extraction process by the dihydrate wet method and poor economy of the technology for preparing calcium carbonate by carbonating and converting the phosphogypsum, a method for decomposing phosphate rock by using the phosphorus-free gypsum needs to be found.
Since the phosphorus ore contains a certain amount of silicon, the phosphorus ore is decomposed with an acid to form an acid-insoluble residue mainly containing silica and calcium silicate, which affects the quality of the solid product, and the residue is usually discarded after being separated and removed, and thus cannot be fully utilized.
In conclusion, it is urgent to find a method for decomposing phosphate rock, generating gypsum without phosphate, and fully utilizing acid-insoluble slag containing silicon element generated by decomposing phosphate rock.
Disclosure of Invention
In order to solve the above technical problems in the prior art, the present invention provides a method for preparing a fiber cement board by decomposing phosphate rock using ammonium chloride and using impurities, comprising the steps of:
(1) crushing phosphate rock, mixing with ammonium chloride solution, stirring and pulping;
(2) adding ground phosphate rock slurry into CaCl2Carrying out reaction in a sub-molten salt;
(3) after full reaction, adding water into the reactant for dilution, discharging and filtering to respectively obtain filtrate and filter cake;
(4) washing the filter cake with water for dechlorination, and then drying the filter cake to obtain triple superphosphate with acid insoluble residue impurities;
(5) adding the obtained triple superphosphate with acid insoluble residue impurities into water, stirring to form slurry, adding hydrochloric acid into the slurry, and reacting;
(6) filtering after the slurry is fully reacted to respectively obtain filtrate and filter cake,
(7) cleaning the filter cake, uniformly mixing the filter cake with water, wood fiber and cement, and reacting at the temperature of 160-;
(8) and (3) filtering water after full reaction to obtain a solid wet material, cutting the solid wet material into required size, then statically curing, steaming at high pressure and high temperature, and cooling to obtain the fiber cement board.
Preferably, the phosphorite is smashed into powder. The powdered phosphorite is easier to react with ammonium chloride solution, so that the reaction is faster and slurry is easier to be formed.
Preferably, the ammonium chloride solution is a supersaturated ammonium chloride solution. More preferably, the supersaturated ammonium chloride solution is a supersaturated solution at 60 ℃. The supersaturated ammonium chloride solution is a supersaturated solution at 60 ℃. The supersaturated ammonium chloride solution contains more ammonium chloride, and can be timely supplemented after the ammonium chloride in the solution is consumed by the reaction with the ore, the solubility of the ammonium chloride is higher under the condition of 60 ℃, the ammonium chloride in the supersaturated ammonium chloride solution is also more, and the loss caused by the increase of the hydrolysis amount of the ammonium chloride due to overhigh temperature can be avoided.
Preferably, the CaCl2 sub-molten salt is obtained by mixing CaCl2 with water accounting for 50-150% of the weight of the CaCl2, uniformly stirring, heating to 170-180 ℃, and keeping the temperature stable. In this case, CaCl2The sub-molten salt system is relatively stable.
Preferably, in the step (2), the ground phosphate rock slurry is slowly added during the process of adding the ground phosphate rock slurry into the CaCl2 sub-molten salt. So as to avoid overflowing and influencing the reaction speed caused by the rapid generation of a large amount of foam due to the rapid addition of the ground phosphate rock slurry.
Preferably, in the step (2), the reaction time is controlled to be more than 2 h. So that the reaction proceeds sufficiently.
Preferably, the water is added for dilution, and is added with water accounting for 15-40% of the weight of the reactants. At the moment, the dilution effect is better, the dosage is moderate, and the solid product loss and the solution impurity increase caused by the increase of the total amount of the slightly soluble substances dissolved in water due to more water addition can be avoided.
Preferably, the step (7) is carried out at 180 ℃. At the moment, the reaction speed is high, and the strength and the hardness of the product can be improved.
Preferably, the step (7) is carried out at a pH > 12. Under the condition that the pH value is more than 12, the silicon dioxide can fully react with substances such as ferrous oxide, aluminum oxide and the like to generate silicate.
Preferably, the adding proportion of the wood fiber and the cement is 10-30% of the weight of the filter cake and 50-180% of the weight of the filter cake. The mixture ratio is moderate, the strength of the obtained fiber cement board is good, and the properties are also proper.
The method of the invention is in CaCl2The sub-molten salt system adopts ammonium chloride as a stealth acid medium, uses ground phosphate rock as a raw material, and reacts with the ammonium chloride in a calcium chloride sub-molten salt system to obtain the product containing SiO2·nH2Heavy superphosphate containing O-based acid-insoluble slag impurities and releasing CO2Gas and NH3Gas, no sulfuric acid consumption and phosphogypsum discharge, SiO in the heavy superphosphate with impurities2·nH2Separating out O-based acid insoluble residue impurities to improve the purity of triple superphosphate and remove SiO2·nH2And (3) reacting the acid-insoluble slag impurities mainly containing O with water, wood fibers and cement to prepare the fiber cement board.
The main reaction equation of the invention is as follows:
when decomposing the phosphate ore ammonium chloride:
2Ca5(PO4)3F+12NH4Cl＝3Ca(H2PO4)2+CaF2+12NH3↑+6CaCl2
(reaction conditions: 160 ℃ C., 180 ℃ C., CaCl)2Sub-molten salt system)
CaCO3+CaSiO3+2NH4Cl＝2NH3↑+H2O+CaCl2+CO2↑+SiO2·2H2O
(reaction conditions: 160 ℃ C., 180 ℃ C., CaCl)2Sub-molten salt system)
Ca (H) formed by the reaction at this time2PO4)2Is a slightly soluble substance, SiO2·2H2O is insoluble matter, the filter cake obtained in the step (3) mainly consists of the two components, so that the purity of the triple superphosphate is not high, and therefore, the filter cake is separated by using free hydrochloric acid and then CaCl is added2Performing reverse reaction in a molten salt system state to improve the purity of triple superphosphate, and adding SiO2·nH2O is separated out and used for preparing calcium silicate.
When the triple superphosphate with acid insoluble slag impurities reacts with hydrochloric acid:
3Ca(H2PO4)2-acid insoluble residue +2HCl ═ 2H3PO4+CaCl2+ acid insoluble residue ↓
(reaction conditions: < 100 ℃ C.)
Wherein the acid insoluble residue is mainly SiO2·nH2O。
With SiO2·nH2When preparing the fiber cement board by using the acid-insoluble slag mainly containing O:
FeO+Al2O3+SiO2·nH2O＝FeSiO3+Al2(SiO3)3+nH2O
(reaction conditions: pH > 12)
In this case, SiO can be produced by controlling the reaction pH to a pH of > 122·nH2O, FeO and Al2O3 are converted into FeSiO3、Al2(SiO3)3And H2O。
Compared with the prior art, the invention has the technical effects that:
in the invention, CaCl2The sub-molten salt system adopts ammonium chloride as a stealth acid medium, uses ground phosphate rock as a raw material, and reacts with the ammonium chloride in a calcium chloride sub-molten salt system to obtain the product containing SiO2·nH2Heavy superphosphate containing O-based acid-insoluble slag impurities and releasing CO2Gas and NH3Gas, no sulfuric acid consumption and phosphogypsum discharge, SiO in the heavy superphosphate with impurities2·nH2Separating out O-based acid insoluble residue impuritiesIncreasing the purity of triple superphosphate and adding SiO2·nH2And (3) reacting the acid-insoluble slag impurities mainly containing O with water, wood fibers and cement to prepare the fiber cement board. The method of the invention has no sulfuric acid consumption and phosphogypsum discharge, separates out the generated impurities, and takes the impurities as raw materials to react with water, wood fiber and cement together to prepare the fiber cement board, thereby eliminating the problems of large consumption of sulfuric acid and large discharge of phosphogypsum in the traditional phosphorite decomposition process, fully utilizing the impurities in the phosphorite, and being a method for decomposing the phosphorite by using ammonium chloride and preparing the fiber cement board by using the impurities, which has no sulfuric acid consumption and discharge of the phosphogypsum, and fully utilizing the impurities in the phosphorite.
Detailed Description
The technical solution of the present invention is further defined below with reference to the specific embodiments, but the scope of the claims is not limited to the description.
Example 1
(1) Crushing 200g of phosphate rock into powder, mixing the powder with an ammonium chloride solution, and stirring the mixture to form slurry, wherein the ammonium chloride solution is an ammonium chloride saturated solution obtained by dissolving 230g of ammonium chloride in 280ml of water at 60 ℃;
(2) adding ground phosphate rock slurry into CaCl2In a sub-molten salt, reacting for 2 hours, wherein the CaCl is2Sub-molten salt is prepared by mixing 800gCaCl2Mixing with 100 wt% water, stirring, heating to 175 deg.C, and keeping stable to obtain the final product;
(3) after full reaction, adding water accounting for 25 percent of the weight of the reactant into the reactant for dilution, discharging and filtering to respectively obtain filtrate and filter cake;
(4) washing the filter cake with water for dechlorination, and drying the filter cake to obtain the product with SiO2·nH2Heavy superphosphate containing O as main acid insoluble residue impurity;
(5) the obtained band is SiO2·nH2Adding the heavy calcium superphosphate mainly containing O and acid-insoluble slag impurities into water, stirring to form slurry, and adding hydrochloric acid into the slurry to perform reaction;
(6) filtering after the slurry is fully reacted to respectively obtain filtrate and filter cake,
(7) cleaning the filter cake, uniformly mixing the filter cake with water, wood fiber accounting for 20 percent of the weight of the filter cake and cement accounting for 115 percent of the weight of the filter cake, and reacting at 180 ℃;
(8) and (3) filtering water after full reaction to obtain a solid wet material, cutting the solid wet material into required size, then statically curing, steaming at high pressure and high temperature, and cooling to obtain the fiber cement board.
Example 2
(1) Crushing 200g of phosphate rock into powder, mixing the powder with an ammonium chloride solution, and stirring and slurrying, wherein the ammonium chloride solution is an ammonium chloride supersaturated solution obtained by dissolving 230g of ammonium chloride in 400ml of water at 40 ℃;
(2) adding ground phosphate rock slurry into CaCl2In a sub-molten salt, reacting for 1h, the CaCl2Sub-molten salt is prepared by mixing 800gCaCl2Mixing with water 50% of the weight of the raw materials, stirring uniformly, heating to 180 ℃, and keeping stable to obtain the product;
(3) after full reaction, adding water accounting for 15 percent of the weight of the reactant into the reactant for dilution, discharging and filtering to respectively obtain filtrate and filter cakes;
(4) washing the filter cake with water for dechlorination, and drying the filter cake to obtain the product with SiO2·nH2Heavy superphosphate containing O as main acid insoluble residue impurity;
(5) the obtained band is SiO2·nH2Adding the heavy calcium superphosphate mainly containing O and acid-insoluble slag impurities into water, stirring to form slurry, and adding hydrochloric acid into the slurry to perform reaction;
(6) filtering after the slurry is fully reacted to respectively obtain filtrate and filter cake,
(7) cleaning the filter cake, uniformly mixing the filter cake with water, wood fiber accounting for 10-30% of the weight of the filter cake and cement accounting for 50-180% of the weight of the filter cake, and reacting at the temperature of 160-;
(8) and (3) filtering water after full reaction to obtain a solid wet material, cutting the solid wet material into required size, then statically curing, steaming at high pressure and high temperature, and cooling to obtain the fiber cement board.
Example 3
(1) Crushing 200g of phosphate rock into powder, mixing the powder with an ammonium chloride solution, and stirring and slurrying, wherein the ammonium chloride solution is an ammonium chloride supersaturated solution obtained by dissolving 230g of ammonium chloride in 230ml of water at 80 ℃;
(2) adding ground phosphate rock slurry into CaCl2In a sub-molten salt, reacting for 3 hours, wherein the CaCl is2Sub-molten salt is prepared by mixing 800gCaCl2Mixing with water 150 wt%, stirring, heating to 170 deg.C, and keeping stable to obtain the final product;
(3) after full reaction, adding water accounting for 40 percent of the weight of the reactant into the reactant for dilution, discharging and filtering to respectively obtain filtrate and filter cakes;
(4) washing the filter cake with water for dechlorination, and drying the filter cake to obtain the product with SiO2·nH2Heavy superphosphate containing O as main acid insoluble residue impurity;
(5) the obtained band is SiO2·nH2Adding the heavy calcium superphosphate mainly containing O and acid-insoluble slag impurities into water, stirring to form slurry, and adding hydrochloric acid into the slurry to perform reaction;
(6) filtering after the slurry is fully reacted to respectively obtain filtrate and filter cake,
(7) cleaning the filter cake, uniformly mixing the filter cake with water, wood fiber accounting for 10-30% of the weight of the filter cake and cement accounting for 50-180% of the weight of the filter cake, and reacting at the temperature of 160-;
(8) and (3) filtering water after full reaction to obtain a solid wet material, cutting the solid wet material into required size, then statically curing, steaming at high pressure and high temperature, and cooling to obtain the fiber cement board.
Example 4
(1) Crushing 200g of phosphate rock into powder, mixing the powder with an ammonium chloride solution, and stirring the mixture to form slurry, wherein the ammonium chloride solution is an ammonium chloride saturated solution obtained by dissolving 230g of ammonium chloride in 280ml of water at 60 ℃;
(2) adding the ground phosphate rock slurry into CaCl slowly2In a sub-molten salt, reacting for 2 hours, wherein the CaCl is2Sub-molten salt is prepared by mixing 800gCaCl2Mixing with 100 wt% water, stirring, heating to 175 deg.C, and keeping stable to obtain the final product;
(3) after full reaction, adding water accounting for 25 percent of the weight of the reactant into the reactant for dilution, discharging and filtering to respectively obtain filtrate and filter cake;
(4) washing the filter cake with water for dechlorination, and drying the filter cake to obtain the product with SiO2·nH2Heavy superphosphate containing O as main acid insoluble residue impurity;
(5) the obtained band is SiO2·nH2Adding the heavy calcium superphosphate mainly containing O and acid-insoluble slag impurities into water, stirring to form slurry, and adding hydrochloric acid into the slurry to perform reaction;
(6) filtering after the slurry is fully reacted to respectively obtain filtrate and filter cake,
(7) cleaning the filter cake, uniformly mixing the filter cake with water, wood fiber accounting for 20 percent of the weight of the filter cake and cement accounting for 115 percent of the weight of the filter cake, and reacting at 180 ℃;
(8) and (3) filtering water after full reaction to obtain a solid wet material, cutting the solid wet material into required size, then statically curing, steaming at high pressure and high temperature, and cooling to obtain the fiber cement board.
Example 5
(1) Crushing 200g of phosphate rock into powder, mixing the powder with an ammonium chloride solution, and stirring the mixture to form slurry, wherein the ammonium chloride solution is an ammonium chloride saturated solution obtained by dissolving 230g of ammonium chloride in 280ml of water at 60 ℃;
(2) adding ground phosphate rock slurry into CaCl2In a sub-molten salt, reacting for 2 hours, wherein the CaCl is2Sub-molten salt is prepared by mixing 800gCaCl2Mixing with 100 wt% water, stirring, heating to 175 deg.C, and keeping stable to obtain the final product;
(3) after full reaction, adding water accounting for 25 percent of the weight of the reactant into the reactant for dilution, discharging and filtering to respectively obtain filtrate and filter cake;
(4) washing the filter cake with water for dechlorination, and drying the filter cake to obtain the product with SiO2·nH2Heavy superphosphate containing O as main acid insoluble residue impurity;
(5) the obtained band is SiO2·nH2Adding the heavy calcium superphosphate mainly containing O and acid-insoluble slag impurities into water, stirring to form slurry, and adding hydrochloric acid into the slurry to perform reaction;
(6) filtering after the slurry is fully reacted to respectively obtain filtrate and filter cake,
(7) washing the filter cake, uniformly mixing the filter cake with water, wood fiber accounting for 20 percent of the weight of the filter cake and cement accounting for 115 percent of the weight of the filter cake, and reacting at the temperature of 180 ℃ and the pH value being more than 12;
(8) and (3) filtering water after full reaction to obtain a solid wet material, cutting the solid wet material into required size, then statically curing, steaming at high pressure and high temperature, and cooling to obtain the fiber cement board.
As can be seen from the examples, the method of the present invention can be effectively utilized with SiO2·nH2The acid mainly containing O does not dissolve slag impurities and converts the impurities into calcium silicate.
Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the technical solution of the present invention is not limited to the above-described embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (9)
1. A method for preparing a fiber cement board by decomposing phosphorite by using ammonium chloride and using impurities is characterized by comprising the following steps:
(1) crushing phosphate rock, mixing with ammonium chloride solution, stirring and pulping;
(2) adding ground phosphate rock slurry into CaCl2In a sub-molten salt, the reaction is carried out, the CaCl2A sub-molten salt is prepared by mixing CaCl2Mixing with water 50-150 wt%, stirring, heating to 170-180 deg.C, and keeping stable to obtain the final product;
(3) after full reaction, adding water into the reactant for dilution, discharging and filtering to respectively obtain filtrate and filter cake;
(4) washing the filter cake with water for dechlorination, and then drying the filter cake to obtain triple superphosphate with acid insoluble residue impurities;
(5) adding the obtained triple superphosphate with acid insoluble residue impurities into water, stirring to form slurry, adding hydrochloric acid into the slurry, and reacting;
(6) filtering after the slurry is fully reacted to respectively obtain filtrate and filter cake,
(7) cleaning the filter cake, uniformly mixing the filter cake with water, wood fiber and cement, and reacting at the temperature of 160-;
(8) and (3) filtering water after full reaction to obtain a solid wet material, cutting the solid wet material into required size, then statically curing, steaming at high pressure and high temperature, and cooling to obtain the fiber cement board.
2. The method of decomposing phosphate rock using ammonium chloride and manufacturing fiber cement board using impurities according to claim 1, wherein the phosphate rock is broken up by breaking up phosphate rock into powder.
3. The method of decomposing phosphate rock using ammonium chloride and manufacturing fiber cement board using impurities according to claim 1, wherein the ammonium chloride solution is a supersaturated ammonium chloride solution.
4. The method for decomposing phosphate rock using ammonium chloride and manufacturing fiber cement board using impurities according to claim 3, wherein the supersaturated ammonium chloride solution is a supersaturated solution at 60 ℃.
5. The method for decomposing phosphate rock using ammonium chloride and manufacturing fiber cement board using impurities as claimed in claim 1, wherein said step (2) is to add powdered phosphate rock slurry to CaCl2In the process of sub-melting the salt, the ground phosphate rock slurry is slowly added.
6. The method for decomposing phosphate rock using ammonium chloride and manufacturing fiber cement board using impurities as claimed in claim 1, wherein the dilution with water is added with 15-40% by weight of reactant.
7. The method for decomposing phosphate rock using ammonium chloride and manufacturing fiber cement board using impurities according to claim 1, wherein the step (7) is a reaction performed at 180 ℃.
8. The method for decomposing phosphate rock using ammonium chloride and manufacturing fiber cement board using impurities according to claim 1, wherein the step (7) is a reaction under the condition of pH > 12.
9. The method for decomposing phosphate rock using ammonium chloride and manufacturing fiber cement board using impurities as claimed in claim 1, wherein the wood fiber and cement are added in a ratio of 10-30% by weight of the filter cake and 50-180% by weight of the filter cake, respectively.
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| CN85107209B (en) * | 1985-09-24 | 1987-06-10 | 路文兴 | Method of chemical sepn. of low grade calcareous phosphorous ore |
| CN1122635C (en) * | 1999-08-22 | 2003-10-01 | 李怀然 | novel process for preparing fodder grade calcium hydrophosphate and by-product calcium carbonate and ammonium chloride by hydrochloric acid method |
| CN1962421B (en) * | 2006-11-19 | 2010-04-14 | 武善东 | Phosphorite acidolysis method |
| CA2739515C (en) * | 2008-10-16 | 2015-04-28 | Ecophos Sa | Process for the production of high purity phosphoric acid |
| CN102659089B (en) * | 2012-04-25 | 2014-06-04 | 中国科学院过程工程研究所 | Producing method of calcium hydrogen phosphate |
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