CN113245068A - Flotation collector for removing impurities and improving whiteness of phosphogypsum through flotation method and application thereof - Google Patents
Flotation collector for removing impurities and improving whiteness of phosphogypsum through flotation method and application thereof Download PDFInfo
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- CN113245068A CN113245068A CN202110588079.4A CN202110588079A CN113245068A CN 113245068 A CN113245068 A CN 113245068A CN 202110588079 A CN202110588079 A CN 202110588079A CN 113245068 A CN113245068 A CN 113245068A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/018—Mixtures of inorganic and organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/02—Collectors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/04—Frothers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
- B03D2203/04—Non-sulfide ores
- B03D2203/06—Phosphate ores
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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 application discloses a flotation collector for removing impurities and improving whiteness of phosphogypsum through a flotation method and application thereof, and the flotation collector specifically comprises the following raw materials in parts by weight: 40-60 parts of vinyl trimethoxy silane, 10-20 parts of ether amine, 20-25 parts of fatty alcohol and 10-15 parts of dodecylamine, wherein the chemical general formula of the ether amine is R-O-CH2CH2CH2NH2Wherein R is C10~16The chemical general formula of the linear alkyl and the fatty alcohol is R-OH, wherein R is C5~8A linear alkyl group. The flotation collector has the advantages of capability of simultaneously capturing mineral impurities such as organic substances, quartz and the like, capability of combining with foaming agent, strong collecting capability, high flotation speed, stable performance, low consumption and the like. The method can obviously improve the removal efficiency of flotation on impurities such as colored substances, minerals and the like in the calcium dihydrogen phosphate suspension, prevent the colored substances and the impurities from entering liquid-phase phosphoric acid and a byproduct phosphogypsum, remove impurities from the source and increase the whiteness of the phosphogypsum.
Description
Technical Field
The invention belongs to the technical field of phosphorus chemical industry solid waste treatment, and particularly relates to a flotation collector for removing impurities and improving the whiteness of phosphogypsum by a flotation method and application thereof.
Background
Phosphogypsum is the main solid waste in the phosphorus chemical industry, and 4.5-5.5t of phosphogypsum is produced by producing 1 ton of phosphoric acid generally. Currently, about 2.8 million tons of phosphogypsum are produced in the world every year, and the comprehensive utilization rate of the phosphogypsum is only about 40 percent. Whiteness is an important factor affecting the application of phosphogypsum.
The phosphogypsum is grey or grey-black due to the fact that the phosphogypsum contains impurities such as phosphoric acid and salts thereof, fluoride, organic matters, quartz, iron-magnesium oxide and the like, and can only be applied to the fields with low added values such as cement, chemical raw materials, soil conditioners, roadbeds and the like. The method has the advantages that the phosphogypsum is subjected to impurity removal and whitening, the utilization value of the phosphogypsum can be greatly improved, natural gypsum with limited reserves can be replaced, the damage of solid waste stockpiling to the ecological environment is reduced, and the resource utilization rate is improved. Patent CN111302377A discloses a method for removing impurities and whitening phosphogypsum, which respectively adopts acid leaching, flotation, gravity separation and the like, has long and complicated process flow, relates to multi-stage dehydration and has high cost. Patent CN111792663A discloses a method for improving the whiteness of phosphogypsum by adopting calcination-acid leaching-washing, but the method adds calcination auxiliaries such as ammonium carbonate, ammonium bicarbonate and sodium chloride, so that the energy consumption is high and the furnace body can be damaged in the calcination process. In addition, the use of sulfuric acid pickling and bleaching produces large volumes of waste water to be treated. The flotation method can effectively remove organic substances, quartz and other impurities in the phosphogypsum, so that the whiteness of the phosphogypsum is greatly improved. The flotation collector is the key for determining the flotation effect.
In conclusion, the development of the flotation collector for improving the whiteness of the phosphogypsum by removing impurities by a flotation method is of great significance in solving the problems that the current phosphogypsum whitening technology is long and complex in process, high in cost, serious in environmental pollution, poor in acid resistance and selectivity of a conventional flotation reagent, weak in collecting capability and the like.
Disclosure of Invention
The invention aims to provide a flotation collector for removing impurities and improving the whiteness of phosphogypsum by a flotation method and application thereof, and the flotation collector has the following advantages: (1) organic matter and silicate impurities can be captured simultaneously; (2) has the foaming agent performance; (3) the performance is stable, and the collecting capability is strong; (4) the flotation speed is high and the using amount is low.
Based on the purpose, the invention adopts the following technical scheme:
a flotation collector for removing impurities and improving whiteness of phosphogypsum by a flotation method is composed of the following raw materials in parts by weight: 40-60 parts of vinyl trimethoxy silane, 10-20 parts of ether amine, 20-25 parts of fatty alcohol and 10-15 parts of dodecylamine.
Further, the chemical general formula of the ether amine is R-O-CH2CH2CH2NH2Wherein R is C10~16A linear alkyl group.
Further, the chemical general formula of the fatty alcohol is R-OH, wherein R is C5~8A linear alkyl group.
The application of the flotation collector in the production of phosphogypsum by carrying out flotation on phosphorite comprises the following steps:
(1) adding phosphorite into 22-32wt% phosphoric acid solution at 50-90 deg.C, and reacting at constant temperature for 0.5-6.0 h to obtain calcium dihydrogen phosphate suspension;
(2) after the reaction is finished, directly transferring the calcium dihydrogen phosphate suspension into a stirring barrel, adding a collecting agent, stirring and mixing for 2-10 min, wherein the using amount of the collecting agent is 50-150 g/t according to the mass of the phosphorite;
(3) transferring the size-mixed suspension into a flotation column, wherein the aeration quantity of the flotation column is 20-200ml/min, and the flotation time is 5-20 min;
(4) after finishing the flotation, transferring the residual solution in the flotation column into a reactor, heating the suspension in the reactor to 55-85 ℃, adding calcium sulfate dihydrate as seed crystal, adding concentrated sulfuric acid, and reacting at the constant temperature of 55-85 ℃ for 1.0-5.0 h;
(5) and (3) after the reaction is finished, filtering the suspension in the reactor, returning the filtrate to the step (1), and continuously washing, filtering and drying the filter cake to obtain the catalyst.
Further, in step (1): phosphorite is a raw material used in wet-process phosphorus chemical industry; the solid-to-liquid ratio of the phosphorite to the phosphoric acid solution is 1: 5-11.
Further, in the step (4): the addition amount of the dihydrate calcium sulfate crystal seed is 2-10% of the mass fraction of the phosphorite; the used concentrated sulfuric acid is 98 percent by mass, and the stoichiometric ratio of the sulfuric acid is 1.02-1.15.
Further, in step (5): the filter cake is washed with water at least, filtered for 2 times and dried at 60 ℃.
The phosphoric acid prepared by decomposing phosphate ore by a sulfuric acid method is the most mature and widely used in the wet-process phosphoric acid process. The reaction is divided into two steps, wherein in the first step, phosphate rock is decomposed by adopting phosphoric acid, namely, the phosphate rock and the phosphoric acid in the circulating slurry are subjected to pre-decomposition in a decomposition tank:
Ca5F(PO4)3+7H3PO4=5Ca(H2PO4)2+HF↑
adding concentrated sulfuric acid and Ca (H) generated in the first step2PO4)2The reaction produces CaSO which is insoluble in the liquid phase4Precipitation with H3PO4：
Ca(H2PO4)2+5H2SO4+5nH2O=5CaSO4·nH2O↓+10H3PO4
According to the two-step reaction, the calcium dihydrogen phosphate suspension generated in the first step is directly subjected to flotation for removing impurities (organic substances, unreacted quartz and other impurities), so that the organic substances, quartz and other impurities in the phosphogypsum can be removed from the source, colored substances and impurities are prevented from entering liquid-phase phosphoric acid and a byproduct phosphogypsum, and the whiteness of the byproduct phosphogypsum is improved. The invention provides a flotation collector for improving the whiteness of phosphogypsum by removing impurities through a flotation method, which is a key in the flotation impurity removal process, can be extremely suitable for a strong acid environment of calcium dihydrogen phosphate suspension, simultaneously captures organic matters and silicate impurities, and obviously improves the whiteness and the purity of the byproduct phosphogypsum.
Further, the flotation collector for removing impurities and improving the whiteness of the phosphogypsum by the flotation method is obtained by pouring the components with the weight into the same container without dividing, stirring for 35-90min at normal temperature and at the rotating speed of 800-1500rpm, and uniformly mixing.
The vinyltrimethoxysilane can be combined with organic matters in phosphogypsum and impurities such as quartz, wollastonite and the like in a hydrogen bond and dehydration condensation mode, so that the hydrophobicity of the vinyltrimethoxysilane is improved; the ether amine and the dodecylamine can be combined with impurities such as quartz, wollastonite and the like, so that the hydrophobicity of the product is further improved; the fatty alcohol is a foaming agent and is mainly used for promoting air to form small bubbles in the slurry, enhancing the capturing capability of the small bubbles on hydrophobic organic matters, quartz, wollastonite and other impurities and improving the removal rate of the impurities.
The combination of each component and the weight part range of each component are determined on the basis of a large number of experiments, and the components and the weight part ranges can fully exert the synergistic enhancement effect among the components.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
a) the flotation collector for removing impurities and improving the whiteness of the phosphogypsum by a flotation method is directly used for removing impurities by flotation of a wet-process phosphorus chemical calcium dihydrogen phosphate suspension, removes colored substances and impurities from the source and improves the whiteness and the purity of the byproduct phosphogypsum.
b) The flotation collector for improving the whiteness of the phosphogypsum by removing impurities through a flotation method is suitable for a strong acid environment, can capture organic matters and silicate impurities simultaneously, and has the advantages of foaming agent performance, stable performance, strong collecting capacity, high flotation speed, low using amount and the like.
c) The flotation collector for removing impurities and improving the whiteness of the phosphogypsum by a flotation method is used for removing impurities by flotation of a calcium dihydrogen phosphate suspension, the yield and the quality of phosphoric acid are hardly influenced, the whiteness of a byproduct phosphogypsum is more than 85% after the phosphogypsum is washed, and the phosphogypsum can be directly used for PVC fillers and building wall materials.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description.
Drawings
FIG. 1 is a graph of a sample after 6min of flotation using the collector of example 1 at an aeration rate of 120 ml/min;
FIG. 2 is phosphogypsum from the flotation of phosphate rock using the collector of example 1;
figure 3 is an optical micrograph of phosphogypsum obtained from the flotation of phosphate rock using the collector of example 1;
fig. 4 is an optical microscope photograph of phosphogypsum obtained by flotation of phosphate rock using the flotation collector of comparative example 1, and the scales in fig. 3 and 4 are both 10 μm.
Detailed Description
In the following examples, only the parts by weight of the feed components were changed without changing the collector preparation method.
In the following examples, phosphate rock of a certain area of Guizhou is adopted, and the content of the main chemical component is P2O5 33.49wt%、CaO 46.97 wt%、SiO27.87 wt% and MgO 0.89 wt%, etc. Heating a 27% phosphoric acid solution in water bath to 70 ℃, adding phosphorite according to the solid-to-liquid ratio of 1kg to 9L, stirring at constant temperature, and reacting for 3.0h to obtain the calcium dihydrogen phosphate suspension.
In the following examples, the specific steps of the flotation and by-product phosphogypsum production process are:
(1) transferring the calcium dihydrogen phosphate suspension into a stirring barrel, stirring at the rotating speed of 300rpm, adding 100g/t of collecting agent according to the mass of the phosphate ore, and continuing stirring for 6 min;
(2) transferring the size-mixed suspension into a flotation column, keeping the aeration quantity of 120 ml/min, and performing flotation for 6 min;
(3) transferring the residual suspension in the flotation column into a reactor, heating the suspension in the reactor to 75 ℃, adding calcium sulfate dihydrate with 7 percent of the mass fraction of phosphorite as seed crystal, and finally slowly adding concentrated sulfuric acid with 98 percent of mass fraction according to the stoichiometric ratio of sulfuric acid of 1.08 (the stoichiometric ratio of sulfuric acid refers to the concentrated sulfuric acid and Ca in the phosphorite)5F(PO4)3The amount of the substances in the mixture) for 3.0h at constant temperature;
(4) after the reaction is finished, filtering the suspension in the reactor, washing and filtering a filter cake for at least 2 times by using water, and finally drying at 60 ℃ to obtain whitening gypsum;
in order to highlight the influence of the weight change of the raw material components on the index of the byproduct phosphogypsum in the examples, flotation tests are carried out on the same calcium dihydrogen phosphate suspension in the examples, and the flotation and the subsequent generation process of the byproduct phosphogypsum are controlled to be the same. The whiteness and the purity of the phosphogypsum are taken as assessment indexes to clarify the performance of the flotation collector.
Example 1
The flotation collector in the embodiment comprises the following raw materials: the raw materials comprise 40 parts by weight of vinyltrimethoxysilane and 3-decyloxy-1-propylamine (
R in the ether amine is C10Straight-chain alkyl) 20 parts, 1-pentanol 25 parts and dodecylamine 15 parts. The sample after flotation is shown in figure 1, and as shown in figure 1, the gray black substance quickly floats to the surface layer of the suspension, and the lower suspension is milky white. The results of the product tests show that the whiteness of phosphogypsum is 86.9 percent and CaSO is shown in figure 24·H2The O content was 99.1% and the optical micrograph of phosphogypsum is shown in figure 3.
Example 2
The flotation collector in the embodiment comprises the following raw materials: the raw materials comprise, by weight, 50 parts of vinyl trimethoxy silane, 15 parts of ether amine, 25 parts of 1-heptanol and 10 parts of dodecylamine. Wherein R in the ether amine is C14Straight chain alkyl, i.e., ether amine, is 3-tetradecyloxy-1-propylamine.
The test result shows that the whiteness of the phosphogypsum is 87.4 percent, and the CaSO4·H2The O content was 98.5%.
Example 3
The flotation collector in the embodiment comprises the following raw materials: the raw materials comprise, by weight, 60 parts of vinyl trimethoxy silane, 10 parts of ether amine, 20 parts of 1-octanol and 10 parts of dodecylamine. Wherein R in the ether amine is C16The alkyl group, i.e., the ether amine in this example, is 3-hexadecyloxy-1-propylamine.
The test result shows that the whiteness of the phosphogypsum is 88.2 percent, and the CaSO4·H2The O content was 97.9%.
Comparative example 1
The flotation collector in the comparative example is C14The alkyl ether amine, namely the ether amine, is 3-tetradecyloxy-1-propylamine.
The test result shows that the optical microscope photo of the phosphogypsum is shown in figure 4, and the whiteness is 66.1%，CaSO4·H2The O content was 94.5%.
Comparative example 2
The flotation collector in the comparative example is a 70:30 parts by weight mixture of dodecylamine and 1-pentanol.
The test result shows that the whiteness of the phosphogypsum is 84.3 percent, and the CaSO4·H2The O content was 95.7%.
Comparative example 3
In the comparative example, the flotation collector is a mixture of vinyl trimethoxy silane and 1-octanol according to a weight ratio of 65: 35.
The test result shows that the whiteness of the phosphogypsum is 86.8 percent, and the CaSO4·H2The O content was 94.5%.
Comparative example 4
In the comparative example, the flotation collector is a mixture of 3-decyloxy-1-propylamine, 1-pentanol and dodecylamine according to the weight part ratio of 40:30: 30.
A large amount of froth is produced during the flotation process, entraining a large amount of liquid. The test result shows that the whiteness of the phosphogypsum is 62.4 percent, and the CaSO4·H2The O content was 95.6%.
Comparative example 5
In the comparative example, the flotation collector is vinyl trimethoxy silane and C16Linear alkyl ether amine (namely the ether amine is 3-hexadecyloxy-1-propylamine) and 1-octanol are mixed according to the weight part ratio of 70:10: 20.
The test result shows that the whiteness of the phosphogypsum is 85.9 percent, and the CaSO4·H2The O content was 96.2%.
As can be seen from the comparison of example 2 with comparative example 1, only C is added14The alkyl ether amine is a collecting agent, so that mineral impurities such as quartz and the like in the calcium dihydrogen phosphate suspension can be removed, but the removal rate of organic substances is low, so that the whiteness and the purity of the byproduct phosphogypsum are only 66.1 percent and 94.5 percent respectively. The collecting agent consisting of 50 parts by weight of vinyltrimethoxysilane, 15 parts by weight of 3-tetradecyloxy-1-propylamine, 25 parts by weight of 1-heptanol and 10 parts by weight of dodecylamine can effectively remove organic substances in calcium dihydrogen phosphate suspension and can also remove mineral impurities such as quartz and the like in calcium dihydrogen phosphate suspension by flotation, so that the whiteness and the purity of the phosphogypsum reach 87 respectively.4% and 98.5%.
By comparing example 1 with comparative example 2, it can be seen that only dodecylamine and C5The mixture of the linear alkyl aliphatic alcohol in parts by weight of 70:30 is used as a collecting agent, although part of organic substances, quartz and other mineral impurities in the calcium dihydrogen phosphate suspension can be removed, due to the lack of vinyl trimethoxy silane, ether amine and other components, the removal rate of the impurities is not high, and the purity of the byproduct phosphogypsum is only 95.7%.
By comparing example 3 with comparative example 3, it can be seen that vinyltrimethoxysilane and C are used alone8The mixture of the linear alkyl aliphatic alcohol according to the parts by weight of 65:35 is used as a collecting agent, although organic substances in calcium dihydrogen phosphate suspension can be basically removed, the removal rate of mineral impurities such as quartz and the like is low, the whiteness of a byproduct phosphogypsum can reach 86.8 percent, but the purity of the byproduct phosphogypsum is only 94.5 percent, mainly the phosphogypsum lacks of components such as ether amine, dodecylamine and the like, and vinyltrimethoxysilane, vinyldodecylamine and C lack of components such as ether amine and dodecylamine8The straight-chain alkyl fatty alcohol is poor in collecting capability of collecting mineral impurities such as quartz and the like by taking a mixture of 65:35 parts by weight as a collecting agent.
By comparing example 1 with comparative example 4, it can be seen that10Straight chain alkyl ether amine, C5The mixture of the linear alkyl fatty alcohol and the dodecylamine according to the weight ratio of 40:30:30 is used as a collecting agent, so that the foaming property is good, the foam is dense, the liquid entrainment amount is large, the removal effect on mineral impurities such as quartz is good, but the removal rate of organic substances is low, and the whiteness of the byproduct phosphogypsum is not high and is only 62.4%.
By comparing example 3 with comparative example 5, it can be seen that vinyltrimethoxysilane and C16Straight chain alkyl ether amine, C8The mixture of linear alkyl fatty alcohol in parts by weight of 70:10:20 is used as a collecting agent, organic substances in suspension can be effectively removed, the whiteness of phosphogypsum is improved to 85.9%, but the removal rate of mineral impurities such as quartz is low, and the purity of the byproduct phosphogypsum is not high.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (7)
1. A flotation collector for removing impurities and improving whiteness of phosphogypsum by a flotation method is characterized in that: the composition is characterized by comprising the following raw materials in parts by weight:
40-60 parts of vinyl trimethoxy silane;
10-20 parts of ether amine;
20-25 parts of fatty alcohol;
10-15 parts of laurylamine.
2. A flotation collector for removing impurities and improving whiteness of phosphogypsum by a flotation method according to claim 1, wherein the chemical general formula of the ether amine is R-O-CH2CH2CH2NH2Wherein R is C10~16A linear alkyl group.
3. The flotation collector for removing impurities and improving whiteness of phosphogypsum by using a flotation method according to claim 1, wherein the chemical general formula of the fatty alcohol is R-OH, and R is C5~8A linear alkyl group.
4. The application of the flotation collector according to any one of claims 1 to 3 in the production of phosphogypsum by carrying out flotation on phosphorite is characterized in that the process is as follows:
(1) adding phosphorite into 22-32wt% phosphoric acid solution at 50-90 deg.C, and reacting at constant temperature for 0.5-6.0 h to obtain calcium dihydrogen phosphate suspension;
(2) after the reaction is finished, directly transferring the calcium dihydrogen phosphate suspension into a stirring barrel, adding a collecting agent, stirring and mixing for 2-10 min, wherein the using amount of the collecting agent is 50-150 g/t according to the mass of the phosphorite;
(3) transferring the size-mixed suspension into a flotation column, wherein the aeration quantity of the flotation column is 20-200ml/min, and the flotation time is 5-20 min;
(4) after finishing the flotation, transferring the residual solution in the flotation column into a reactor, heating the suspension in the reactor to 55-85 ℃, adding calcium sulfate dihydrate as seed crystal, adding concentrated sulfuric acid, and reacting at the constant temperature of 55-85 ℃ for 1.0-5.0 h;
(5) and (3) after the reaction is finished, filtering the suspension in the reactor, returning the filtrate to the step (1), and continuously washing, filtering and drying the filter cake to obtain the catalyst.
5. The use according to claim 4, wherein in step (1): phosphorite is a raw material used in wet-process phosphorus chemical industry; the solid-to-liquid ratio of the phosphorite to the phosphoric acid solution is 1: 5-11.
6. The use according to claim 4, wherein in step (4): the addition amount of the dihydrate calcium sulfate crystal seed is 2-10% of the mass fraction of the phosphorite; the used concentrated sulfuric acid is 98 percent by mass, and the stoichiometric ratio of the sulfuric acid is 1.02-1.15.
7. Use according to claim 4, wherein the filter cake is washed with water-filtered at least 2 times and dried at 60 ℃.
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| CN115672568A (en) * | 2022-12-30 | 2023-02-03 | 矿冶科技集团有限公司 | Method for preparing low-silicon high-grade phosphogypsum by reverse flotation and desiliconization of phosphogypsum waste residues |
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| CN112474063A (en) * | 2020-11-11 | 2021-03-12 | 福建志远矿业有限公司 | Collecting agent for collecting siliceous minerals and preparation method thereof |
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| US20110166256A1 (en) * | 2008-05-27 | 2011-07-07 | Laurence Gallez | Gypsum Materials |
| CN102105229A (en) * | 2008-07-25 | 2011-06-22 | 塞特克技术公司 | Flotation reagents and flotation processes utilizing same |
| CN112279540A (en) * | 2020-09-22 | 2021-01-29 | 湖北国创高新材料股份有限公司 | Method for producing alpha-hemihydrate gypsum by using phosphogypsum |
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