CN111498820A - Process for simultaneously preparing high-quality calcium sulfate whiskers from phosphorus concentrate enriched by medium-low-grade phosphate ore or phosphorus tailings - Google Patents
Process for simultaneously preparing high-quality calcium sulfate whiskers from phosphorus concentrate enriched by medium-low-grade phosphate ore or phosphorus tailings Download PDFInfo
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- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/60—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape characterised by shape
- C30B29/62—Whiskers or needles
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- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
- C30B7/10—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions by application of pressure, e.g. hydrothermal processes
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Abstract
The invention relates to the technical field of inorganic chemical industry, in particular to a process for simultaneously preparing high-quality calcium sulfate whiskers by enriching phosphate concentrate from medium-low grade phosphate ore or phosphate tailings. According to the method, the calcium and magnesium oxides are simultaneously leached from the calcined slag of middle-low grade phosphorite or phosphate tailings by controlling the operation conditions, then the calcium and the magnesium in the mixed extracting solution containing calcium and magnesium ions are sequentially separated to obtain high-quality calcium sulfate whiskers and magnesium hydroxide, and finally the obtained phosphate concentrate, calcium sulfate whiskers and magnesium hydroxide products have good quality.
Description
Technical Field
The invention relates to the technical field of inorganic chemical industry, in particular to a process for simultaneously preparing high-quality calcium sulfate whiskers by enriching phosphate concentrate from medium-low grade phosphate ore or phosphate tailings.
Background
The phosphorite resource is an important strategic resource of China, is a material basis of phosphorus chemical industry, has non-regenerability, is rich in phosphorite resource in China, and is a medium-low grade phosphorite which is difficult to directly utilize by more than 80 percent.
With the development and utilization of a large amount of phosphorite resources, the production raw materials of phosphorus chemical industry have to depend on middle-low grade phosphorite, the key of the middle-low grade phosphorite utilization technology lies in the enrichment of phosphorus and the removal of impurity magnesium, and the existing mineral separation method has low utilization rate of phosphorus resources and brings huge environmental protection risks due to the generation of a large amount of tailings. The method is characterized in that the high-quality low-magnesium phosphate concentrate is obtained by exploring the chemical treatment of the medium-low grade phosphate ore, the calcium and magnesium are recycled, and the tailings are not discharged, so that the method has important significance for promoting the efficient clean utilization of phosphate ore resources in the industrial phosphorization industry and realizing the sustainable development.
At present, in the prior art, the method for treating the medium-low grade phosphate ore generally adopts a method of leaching calcium and magnesium in calcined ammonium salt liquid (ammonium nitrate, ammonium chloride, ammonium sulfate and the like) to enrich and obtain high-quality phosphate concentrate (P)2O5The mass fraction can reach more than 32-38%, MgO is less than or equal to 1.5%), but the effect of separating and utilizing a large amount of calcium and magnesium contained in the calcium-magnesium alloy is not good, and the generated additional economic benefit is not good.
For example, patent Z L201510889509.0 (a process for preparing calcium carbonate and magnesium oxide as byproducts of phosphate concentrate from middle-low grade phosphate ore) discloses a process for preparing calcium carbonate and magnesium oxide as byproducts of phosphate concentrate from middle-low grade phosphate ore at 1100 ℃, and belongs to the technical field of inorganic chemical industry.
At present, part of the methods aim at enrichment to obtain high-quality phosphate concentrate, and calcium and magnesium products in the phosphate concentrate are simultaneously obtained as a mixture, because calcium and magnesium are not separated, the obtained mixture of the calcium and magnesium products has low utilization value, the application range is greatly limited, and the method is not beneficial to industrial development, for example, patent Z L201510226163.6 (a method for extracting phosphate concentrate from phosphate tailings and co-producing magnesium-containing calcium carbonate) discloses a method for circularly leaching and enriching phosphate concentrate and recycling magnesium-containing calcium carbonate by taking phosphate tailings as a raw material, wherein the method can fully utilize the tailings left after raw ore dressing of phosphate rock to prepare two products of magnesium-containing calcium carbonate and phosphate concentrate through the recycling of ammonium nitrate leachate.
Therefore, a process which can respectively recover calcium, magnesium and phosphorus resources, obtain high-quality calcium and magnesium products, reduce the discharge of three wastes and reduce the pollution to the environment, enrich a large amount of medium and low-grade phosphorite and waste phosphate tailings which occupy land and are difficult to utilize into high-quality phosphate concentrate, is simple to operate, has small water washing quantity requirement and is recycled is found, and is a great problem which needs to be solved urgently in sustainable development of the phosphorus chemical industry.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a process for simultaneously preparing high-quality calcium sulfate whiskers by enriching phosphate concentrate from medium-low-grade phosphate ore or phosphate tailings, which comprises the following steps:
a process for simultaneously preparing high-quality calcium sulfate whiskers by enriching phosphate concentrate from medium-low-grade phosphate ore or phosphate tailings comprises the following steps:
(1) calcining the middle-low grade phosphorite or phosphate tailings at the temperature of 700 ℃ and 1200 ℃ to obtain calcined ore powder;
(2) adding calcined mineral powder and an ammonium nitrate solution into a reaction tank, stirring for reaction to generate ammonia gas, and filtering and separating to obtain a leaching solution A and leaching residue a, wherein the leaching solution A is a mixed solution of calcium nitrate, magnesium nitrate and ammonium nitrate, and the leaching residue a is magnesium-enriched phosphorite and can be used for preparing high-quality phosphate concentrate through magnesium removal treatment;
(3) adding (NH) to the leaching solution A4)2SO4Stirring the solution for reaction, filtering and separating to obtain a filtrate B and filter residue B, wherein the filtrate B is a magnesium nitrate ammonium nitrate solution; washing, purifying and separating the filtered slag b to obtain a calcium sulfate filter cake;
(4) adding water into the calcium sulfate filter cake, pulping, placing in a reaction kettle, simultaneously adding a proper amount of auxiliary agent, heating for hydration reaction, discharging, separating and drying to obtain the calcium sulfate whisker product.
Further, the step (1) is calcining at the temperature of 700-1200 ℃ for 1-2 h. At this time, calcination makes calcite and dolomite decomposed well and makes contained fluorapatite (Ca)5F(PO4)3) Does not decompose.
Further, in the step (2), the reaction temperature of the ammonium nitrate solution with the concentration of 5-50% is 65-100 ℃, and the reaction time is 30-120 min. At the moment, the reaction efficiency is higher, the reaction effect is better, and calcium and magnesium ions can fully enter the solution.
Further, in the step (3), adding (NH) into the leaching solution A4)2SO4The solution is stirred for reaction, and (NH) is used4)2SO4The solution concentration is 15-50% mass fraction, the stirring speed is 300-700r/min, the reaction temperature is 30-80 ℃, and the reaction time is 30-120 min. At the moment, the reaction is more sufficient, and calcium ions can be sufficiently separated from the solution.
Further, adding water into the calcium sulfate filter cake, pulping, and then placing the calcium sulfate filter cake into a pressure reaction kettle to be heated for hydration reaction, wherein the solid content of the slurry is 3-10%, the stirring speed is 200-700r/min, the reaction temperature is 90-180 ℃, and the reaction time is 30-120 min. The calcium sulfate whisker obtained under the condition has higher quality and better additional economic benefit.
Further, in the step (4), the addition aid is a commercially available calcium sulfate whisker crystal transformation stabilizer, and the dosage is 0.01-5%. The calcium sulfate whisker obtained under the condition has higher quality and better additional economic benefit.
And further, the method also comprises a step (5), the filtrate B is treated by ammonia water to recover magnesium hydroxide, and the ammonium nitrate solution is returned for recycling, such as recycling to the step (2).
The principle of chemical reaction in each step:
in the step (1), the middle-low grade phosphorite or phosphate tailings contain dolomite (CaCO)3·MgCO3) Calcite (CaCO)3) And fluorapatite (Ca)5F(PO4)3) Wherein the decomposition of dolomite and calcite begins at a high temperature above 750 ℃, and the specific equation is as follows:
CaCO3·MgCO3＝CaO+MgO+2CO2
CaCO3＝CaO+CO2
while fluorapatite (Ca)5F(PO4)3) The decomposition temperature of (A) is 1650 ℃, and the decomposition temperature is not decomposed within the range of 700-1200 ℃.
In the step (2), the formula of ammonium nitrate leaching is as follows:
CaO+2NH4NO3＝Ca(NO3)2+2NH3+H2O
MgO+2NH4NO3＝Mg(NO3)2+2NH3+H2O
the leaching solution A mainly contains Ca2+、Mg2+、NH4 +1And NO3 -1Ion, main component fluorapatite (Ca) in leaching residue a5F(PO4)3)。
In the step (3), the specific equation is as follows:
Ca(NO3)2+(NH4)2SO4+2H2O＝CaSO4·2H2O+2NH4NO3
the filtrate B mainly contains Mg2+、NH4 +1And NO3 -1And (4) ions, wherein the filter residue b is calcium sulfate dihydrate.
In the step (5), the specific equation is as follows:
Mg(NO3)2+2NH4OH＝Mg(OH)2+2NH4NO3
the filtrate mainly contains NH4 +1And NO3 -1Ions, Mg (OH)2And (5) precipitating and separating.
Patent CN105540560B (a process for preparing low-magnesium phosphate concentrate by-product calcium carbonate and magnesium oxide from medium-low grade phosphate rock) discloses a process for preparing phosphate concentrate by-product calcium carbonate and magnesium oxide from medium-low grade phosphate rock, which belongs to the technical field of inorganic chemical industry and comprises the following steps: calcining the middle-low grade phosphorite or phosphate tailings at the temperature of 900 ℃ and 1100 ℃; then a series of treatments such as digestion, leaching and precipitation are carried out to obtain phosphate concentrate, calcium carbonate and magnesium oxide. The washing capacity requirement is large, the steps are complex, leaching needs to be carried out twice, two acid radicals of two leaching systems of ammonium nitrate and ammonium sulfate can influence each other, the leaching efficiency is reduced, and the purity of a final product can be influenced.
Patent Z L201510226163.6 (a method for extracting phosphate concentrate from phosphate tailings and co-producing magnesium-containing calcium carbonate) discloses a method for circularly leaching and enriching phosphate concentrate and recovering magnesium-containing calcium carbonate by taking phosphate tailings as raw materials, wherein the method can fully utilize the tailings left after the phosphate ore raw ore is selected, and two products of magnesium-containing calcium carbonate and phosphate concentrate are prepared by circularly utilizing ammonium nitrate leachate.
The method adopts ammonium nitrate solvent to leach and separate calcium and magnesium once, the washing quantity requirement is low, the content of the calcium sulfate crystal whisker obtained through synthesis and hydrothermal treatment is more than 98 percent, and each index is excellent.
Compared with the prior art, the invention has the technical effects that:
1. the method takes the middle-low grade phosphorite or phosphate tailings as the main raw material to enrich phosphate concentrate and simultaneously obtain calcium sulfate whiskers and magnesium hydroxide, thereby effectively solving the problems of comprehensive utilization of the middle-low grade phosphorite, environmental pollution caused by occupation of a large amount of land of the phosphate tailings and the like.
2. The invention simultaneously leaches calcium and magnesium oxides from the calcined slag of middle and low grade phosphorite or phosphate tailings by controlling the operation conditions, and then extracts the calcium and magnesium oxides respectively, thereby solving the problems that calcium and magnesium are generally leached twice in the prior phosphorite treatment, and are synthesized and separated respectively, the required washing amount is large, and the operation is complex.
3. The invention separates calcium and magnesium in the mixed extract containing calcium and magnesium ions in sequence to obtain high-quality calcium sulfate whiskers and magnesium hydroxide, and solves the problems that high-quality phosphate concentrate is obtained by enrichment and calcium and magnesium products are taken as a mixture to be obtained at the same time.
4. In the process, the ammonia gas generated in the steps (2) and (5) is recycled in the system, so that the cost of raw materials is saved, the gas generated in the process is fully utilized, and the waste of resources and the environmental pollution are avoided.
5. In the process, the washing water amount is greatly reduced, the water consumption is reduced, and the washing water is completely recycled, so that the process has obvious environmental protection significance.
6. The phosphorus concentrate, calcium sulfate whisker and magnesium hydroxide products obtained by the method have higher phosphorus concentrate purity (P)2O5More than or equal to 36.0 percent and MgO less than or equal to 0.5 percent); the calcium sulfate whisker has the calcium sulfate content of more than 98 percent, the whiteness of more than 90 percent and the length-diameter ratio of 50-100, and is high-quality calcium sulfate whisker (see figure 2 specifically).
Drawings
FIG. 1 is a schematic process flow diagram of the present application.
FIG. 2 is a screenshot of a microscope display of calcium sulfate whiskers
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) Calcining 100g of medium-low grade phosphorite at 950 ℃ for 1.5h to obtain calcined ore powder;
(2) adding calcined mineral powder and 25% ammonium nitrate solution into a reaction tank, stirring for reaction at 85 ℃ for 75min to generate ammonia gas, filtering and separating to obtain a leaching solution A and leaching residues a, wherein the leaching solution A is a mixed solution of calcium nitrate, magnesium nitrate and ammonium nitrate, and the leaching residues a are enriched to obtain high-quality phosphate concentrate;
(3) adding (NH) with the concentration of 35 percent by mass into the leaching solution A4)2SO4Stirring the solution for reaction at the stirring speed of 500r/min and the reaction temperature of 55 ℃ for 75min, filtering and separating to obtain a filtrate B and a filter residue B, wherein the filtrate B is a magnesium nitrate ammonium nitrate solution; washing, purifying and separating the filtered slag b to obtain a calcium sulfate filter cake;
(4) adding water into the calcium sulfate filter cake, pulping, placing into a reaction kettle, adding a proper amount of auxiliary agent, heating, carrying out hydration reaction, wherein the solid content of the slurry is 6%, the stirring speed is 400r/min, the reaction temperature is 130 ℃, the reaction time is 75min, then discharging, separating and drying to obtain a calcium sulfate whisker product, wherein the auxiliary agent is a commercially available calcium sulfate whisker crystal transformation stabilizer, and the dosage is 2.5%;
(5) and (3) treating the filtrate B with ammonia water to recover magnesium hydroxide, and returning the ammonium nitrate solution to the step (2) for recycling.
Example 2
(1) Calcining 100g of medium-low grade phosphorite for 2h at 1000 ℃ to obtain calcined mineral powder;
(2) adding calcined mineral powder and 35% ammonium nitrate solution into a reaction tank, stirring for reaction at 65 ℃ for 120min to generate ammonia gas, and filtering and separating to obtain a leaching solution A and leaching residues a, wherein the leaching solution A is a mixed solution of calcium nitrate, magnesium nitrate and ammonium nitrate, and the leaching residues a are enriched to obtain high-quality phosphate concentrate;
(3) adding (NH) with the concentration of 15 percent by mass into the leaching solution A4)2SO4Stirring the solution for reaction at the stirring speed of 700r/min and the reaction temperature of 30 ℃ for 120min, filtering and separating to obtain a filtrate B and a filter residue B, wherein the filtrate B is a magnesium nitrate ammonium nitrate solution; washing, purifying and separating the filtered slag b to obtain a calcium sulfate filter cake;
(4) adding water into the calcium sulfate filter cake, pulping, placing into a reaction kettle, adding a proper amount of auxiliary agent, heating, carrying out hydration reaction, wherein the solid content of the slurry is 3%, the stirring speed is 200r/min, the reaction temperature is 120 ℃, the reaction time is 120min, then discharging, separating and drying to obtain a calcium sulfate whisker product, wherein the auxiliary agent is a commercially available calcium sulfate whisker crystal transformation stabilizer, and the dosage is 0.05%;
(5) and (3) treating the filtrate B with ammonia water to recover magnesium hydroxide, and returning the ammonium nitrate solution to the step (2) for recycling.
Example 3
(1) Calcining 100g of medium-low grade phosphorite at 1200 ℃ for 1h to obtain calcined mineral powder;
(2) adding calcined mineral powder and 50% ammonium nitrate solution into a reaction tank, stirring for reaction at the reaction temperature of 100 ℃ for 30min to generate ammonia gas, and filtering and separating to obtain a leaching solution A and leaching residues a, wherein the leaching solution A is a mixed solution of calcium nitrate, magnesium nitrate and ammonium nitrate, and the leaching residues a are enriched to obtain high-quality phosphate concentrate;
(3) adding (NH) with the concentration of 50% in mass fraction into the leaching solution A4)2SO4Stirring the solution for reaction at the stirring speed of 300r/min and the reaction temperature of 80 ℃ for 30min, filtering and separating to obtain a filtrate B and a filter residue B, wherein the filtrate B is a magnesium nitrate ammonium nitrate solution; washing, purifying and separating the filtered slag b to obtain a calcium sulfate filter cake;
(4) adding water into the calcium sulfate filter cake, pulping, placing into a reaction kettle, adding a proper amount of auxiliary agent, heating, carrying out hydration reaction, wherein the solid content of the slurry is 10%, the stirring speed is 700r/min, the reaction temperature is 180 ℃, the reaction time is 30min, then discharging, separating and drying to obtain a calcium sulfate whisker product, wherein the auxiliary agent is a commercially available calcium sulfate whisker crystal transformation stabilizer, and the dosage is 5%;
(5) and (3) treating the filtrate B with ammonia water to recover magnesium hydroxide, and returning the ammonium nitrate solution to the step (2) for recycling.
Example 4
(1) Calcining 100g of phosphate tailings at 1050 ℃ for 1.5h to obtain calcined mineral powder;
(2) adding calcined mineral powder and 25% ammonium nitrate solution into a reaction tank, stirring for reaction at the reaction temperature of 95 ℃ for 75min to generate ammonia gas, and filtering and separating to obtain a leaching solution A and leaching residues a, wherein the leaching solution A is a mixed solution of calcium nitrate, magnesium nitrate and ammonium nitrate, and the leaching residues a are enriched to obtain high-quality phosphate concentrate;
(3) adding (NH) with the concentration of 35 percent by mass into the leaching solution A4)2SO4Stirring the solution for reaction at the stirring speed of 500r/min and the reaction temperature of 55 ℃ for 75min, filtering and separating to obtain a filtrate B and a filter residue B, wherein the filtrate B is a magnesium nitrate ammonium nitrate solution; washing, purifying and separating the filtered slag b to obtain a calcium sulfate filter cake;
(4) adding water into the calcium sulfate filter cake, pulping, placing into a reaction kettle, adding a proper amount of auxiliary agent, heating, carrying out hydration reaction, wherein the solid content of the slurry is 8%, the stirring speed is 400r/min, the reaction temperature is 130 ℃, the reaction time is 75min, then discharging, separating and drying to obtain a calcium sulfate whisker product, wherein the auxiliary agent is a commercially available calcium sulfate whisker crystal transformation stabilizer, and the dosage is 2.5%;
(5) and (3) treating the filtrate B with ammonia water to recover magnesium hydroxide, and returning the ammonium nitrate solution to the step (2) for recycling.
The middle-low grade phosphorite used in the examples comprises the following components:
the composition of the phosphate tailings used in the examples was as follows:
| item | P2O5 | CaO | MgO | Fe2O3 | Al2O3 | F |
| ％ | 9.73 | 38.15 | 16.8 | 0.27 | 0.56 | 0.88 |
The quality of the products obtained in examples 1 to 4 was as follows:
the phosphorus concentrate, calcium sulfate whisker and magnesium hydroxide products obtained by the method have higher phosphorus concentrate purity (P)2O5More than or equal to 36.0 percent and MgO less than or equal to 0.5 percent); the calcium sulfate content of the calcium sulfate crystal whisker is more than 98 percent, the whiteness is more than 90 percent, and the length-diameter ratio of the crystal whisker is 50-100, thus the crystal whisker is high-quality calcium sulfate crystal whisker.
In conclusion, the method of the invention can be used for medium and low gradeThe high-quality calcium sulfate crystal whisker is prepared in the process of enriching the phosphate concentrate from the phosphate ore or the phosphate tailings, and the phosphate concentrate, the calcium sulfate crystal whisker and the magnesium hydroxide products obtained by the invention have higher purity (P)2O5More than or equal to 36.0 percent and MgO less than or equal to 0.5 percent); the calcium sulfate content of the calcium sulfate crystal whisker is more than 98 percent, the whiteness is more than 90 percent, and the length-diameter ratio of the crystal whisker is 50-100, thus the crystal whisker is high-quality calcium sulfate crystal whisker.
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 (8)
1. A process for simultaneously preparing high-quality calcium sulfate whiskers by enriching phosphate concentrate from medium-low grade phosphate ore or phosphate tailings is characterized by comprising the following steps:
(1) calcining the middle-low grade phosphorite or phosphate tailings at the temperature of 700 ℃ and 1200 ℃ to obtain calcined ore powder;
(2) adding calcined ore powder and an ammonium nitrate solution (300% of the theoretical amount of ammonium nitrate required by the mass fraction of MgO in the calcined ore powder) into a reaction tank, stirring for reaction to generate ammonia gas, and filtering and separating to obtain a leaching solution A and leaching residue a, wherein the leaching solution A is a mixed solution of calcium nitrate, magnesium nitrate and ammonium nitrate, and the leaching residue a is the prepared high-quality phosphate concentrate;
(3) adding (NH) to the leaching solution A4)2SO4Solution (according to the mass fraction of CaO in the leaching solution (NH)4)2SO4100% of theoretical amount), stirring for reaction, filtering and separating to obtain a filtrate B and a filter residue B, wherein the filtrate B is a magnesium nitrate ammonium nitrate solution; washing, purifying and separating the filtered slag b to obtain a calcium sulfate filter cake;
(4) adding water into the calcium sulfate filter cake, pulping, placing in a reaction kettle, simultaneously adding a proper amount of auxiliary agent, heating for hydration reaction, discharging, separating and drying to obtain the calcium sulfate whisker product.
2. The process for simultaneously preparing high-quality calcium sulfate whiskers from the phosphorus concentrate enriched by the medium-low grade phosphorus ores or phosphorus tailings as claimed in claim 1, wherein the step (1) is calcining at 700-1200 ℃ for 1-2 h.
3. The process for simultaneously preparing the high-quality calcium sulfate whiskers from the phosphorus concentrate enriched by the medium-low grade phosphorus ores or phosphorus tailings according to the claim 1, wherein in the step (2), the concentration of the ammonium nitrate solution is 5-50%, the reaction temperature is 65-120 ℃, and the reaction time is 30-120 min.
4. The process for simultaneously preparing high-quality calcium sulfate whiskers from the phosphorus concentrate enriched by the medium-low grade phosphorus ores or phosphorus tailings according to claim 1, wherein in the step (3), the (NH) is added into the leaching solution A4)2SO4The solution is stirred for reaction, and (NH) is used4)2SO4The solution concentration is 15-50% mass fraction, the stirring speed is 300-700r/min, the reaction temperature is 30-80 ℃, and the reaction time is 30-120 min.
5. The process for simultaneously preparing high-quality calcium sulfate whiskers from the phosphorus concentrate enriched by the medium-low grade phosphorite or phosphate tailings as claimed in claim 1, which is characterized in that water is added into a calcium sulfate filter cake for pulping, the calcium sulfate filter cake is placed into a pressure reaction kettle for heating for hydration reaction, wherein the solid content of slurry is 3-10%, the stirring speed is 200-700r/min, the reaction temperature is 90-180 ℃, and the reaction time is 30-120 min.
6. The process for simultaneously preparing high-quality calcium sulfate whiskers from the phosphorus concentrate enriched by the medium-low grade phosphorus ores or phosphorus tailings according to claim 1, wherein in the step (4), the addition aid is a commercially available calcium sulfate whisker crystal transformation stabilizer, and the dosage of the addition aid is 0.01-5%.
7. The process for simultaneously preparing high-quality calcium sulfate whiskers from the phosphorus concentrate enriched in the medium-low-grade phosphorus ores or phosphorus tailings according to claim 1, which is characterized by further comprising the step (5) of treating the filtrate B with ammonia water to recover magnesium hydroxide, and returning the ammonium nitrate solution to recycle.
8. The process for simultaneously preparing high-quality calcium sulfate whiskers from the phosphorus concentrate enriched in the medium-low-grade phosphorus ores or phosphorus tailings according to claim 7, wherein the ammonium nitrate solution is recycled, and the obtained ammonium nitrate solution is recycled to the step (2).
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Cited By (8)
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| CN112645367A (en) * | 2021-01-04 | 2021-04-13 | 贵州芭田生态工程有限公司 | Method for preparing calcium sulfate, magnesium oxide and potassium calcium magnesium nitrate from calcium magnesium-containing leaching solution |
| CN112707429A (en) * | 2021-01-04 | 2021-04-27 | 贵州芭田生态工程有限公司 | Method for preparing calcium-containing product and magnesium-containing product from calcium-containing magnesium leaching solution |
| CN112723396A (en) * | 2021-01-04 | 2021-04-30 | 贵州芭田生态工程有限公司 | Method for preparing magnesium oxide and calcium ammonium nitrate from chemical beneficiation by-product |
| CN112758972A (en) * | 2021-01-04 | 2021-05-07 | 贵州芭田生态工程有限公司 | Method for preparing calcium sulfate, magnesium hydroxide and potassium magnesium nitrate from calcium-containing magnesium leaching solution |
| CN112758971A (en) * | 2021-01-04 | 2021-05-07 | 贵州芭田生态工程有限公司 | Method for recycling calcium-magnesium-containing leaching solution |
| CN112777622A (en) * | 2021-01-04 | 2021-05-11 | 贵州芭田生态工程有限公司 | Method for preparing calcium sulfate, magnesium hydroxide and potassium calcium nitrate/potassium calcium magnesium nitrate from calcium and magnesium-containing leaching solution |
| CN112794354A (en) * | 2021-01-04 | 2021-05-14 | 贵州芭田生态工程有限公司 | Method for preparing calcium carbonate and potassium magnesium nitrate/potassium calcium magnesium nitrate from calcium magnesium-containing leaching solution |
| CN112794346A (en) * | 2021-01-04 | 2021-05-14 | 贵州芭田生态工程有限公司 | Method for simultaneously preparing calcium sulfate, potassium nitrate, potassium magnesium nitrate and magnesium carbonate from calcium magnesium ammonium nitrate liquid |
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| CN112645367A (en) * | 2021-01-04 | 2021-04-13 | 贵州芭田生态工程有限公司 | Method for preparing calcium sulfate, magnesium oxide and potassium calcium magnesium nitrate from calcium magnesium-containing leaching solution |
| CN112707429A (en) * | 2021-01-04 | 2021-04-27 | 贵州芭田生态工程有限公司 | Method for preparing calcium-containing product and magnesium-containing product from calcium-containing magnesium leaching solution |
| CN112723396A (en) * | 2021-01-04 | 2021-04-30 | 贵州芭田生态工程有限公司 | Method for preparing magnesium oxide and calcium ammonium nitrate from chemical beneficiation by-product |
| CN112758972A (en) * | 2021-01-04 | 2021-05-07 | 贵州芭田生态工程有限公司 | Method for preparing calcium sulfate, magnesium hydroxide and potassium magnesium nitrate from calcium-containing magnesium leaching solution |
| CN112758971A (en) * | 2021-01-04 | 2021-05-07 | 贵州芭田生态工程有限公司 | Method for recycling calcium-magnesium-containing leaching solution |
| CN112777622A (en) * | 2021-01-04 | 2021-05-11 | 贵州芭田生态工程有限公司 | Method for preparing calcium sulfate, magnesium hydroxide and potassium calcium nitrate/potassium calcium magnesium nitrate from calcium and magnesium-containing leaching solution |
| CN112794354A (en) * | 2021-01-04 | 2021-05-14 | 贵州芭田生态工程有限公司 | Method for preparing calcium carbonate and potassium magnesium nitrate/potassium calcium magnesium nitrate from calcium magnesium-containing leaching solution |
| CN112794346A (en) * | 2021-01-04 | 2021-05-14 | 贵州芭田生态工程有限公司 | Method for simultaneously preparing calcium sulfate, potassium nitrate, potassium magnesium nitrate and magnesium carbonate from calcium magnesium ammonium nitrate liquid |
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