CN108516713B - Pretreatment and application method of phosphogypsum - Google Patents
Pretreatment and application method of phosphogypsum Download PDFInfo
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- CN108516713B CN108516713B CN201810222635.4A CN201810222635A CN108516713B CN 108516713 B CN108516713 B CN 108516713B CN 201810222635 A CN201810222635 A CN 201810222635A CN 108516713 B CN108516713 B CN 108516713B
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical 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
- C04B18/0445—Synthetic gypsum, e.g. phosphogypsum
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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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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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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
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- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the field of functional utilization of phosphorus chemical waste materials, and particularly discloses a phosphogypsum pretreatment method which is characterized in that phosphogypsum, heavy calcium carbonate and water are mixed and pulped to obtain phosphogypsum slurry; and aging the phosphogypsum slurry to obtain the pretreated phosphogypsum. The invention also discloses an application of the pretreated phosphogypsum as a filling aggregate. The inventor researches and discovers that the synergistic pretreatment of heavy calcium carbonate and aging can improve the performance of the obtained pretreated phosphogypsum, such as fixing harmful components in the phosphogypsum and improving the strength of the application field of the phosphogypsum as mining filling aggregate.
Description
Technical Field
The invention relates to the field of phosphorus chemical industry, in particular to a preparation method of a filling body by using industrial heavy calcium carbonate powder to cooperatively age and pretreat phosphogypsum as an aggregate.
Background
The phosphogypsum is a byproduct in the process of preparing phosphoric acid by decomposing phosphate ore with sulfuric acid, and is different from the common tailing filling technology that inert tailings (main component silicon dioxide) are used as aggregate, and the phosphogypsum aggregate used in the phosphogypsum filling technology is mainly composed of calcium sulfate dihydrate, wherein a large amount of residual acid and harmful impurities such as phosphorus, fluorine and the like are contained. Research shows that the pH value of a gelling hydration reaction system of a conventional gelling material such as cement, an alkali-activated gelling agent and the like is required to be more than or equal to 11.5, the pH value of phosphogypsum is only 1-5, a large amount of residual acid is contained, the pH value of the hydration system can be reduced, the gelling hydration reaction is hindered, in addition, soluble fluorine compounds and soluble phosphorus compounds in the phosphogypsum are important factors causing the retardation of a phosphogypsum filling body, and the strength development of the filling body is greatly influenced, so that the filling body cannot reach the expected strength underground. Therefore, it is necessary to develop a new phosphogypsum filling preparation method based on phosphogypsum pretreatment aiming at the low-pH phosphogypsum. At present, the phosphogypsum pretreatment method mainly comprises the methods of water washing, lime neutralization, flotation, screening, ball milling, calcination, natural aging and the like.
In the method, the water washing method and the natural aging method are simple to operate, but no matter the phosphogypsum is treated by water or rainwater in the water washing method or the natural aging method, secondary pollution is easy to cause, and the water consumption of the water washing method is too large and is not economic enough; the lime neutralization method is not easy to cause secondary pollution, but has higher cost, is difficult to meet the economic and technical requirements of phosphogypsum filling, and the mechanical property of the phosphogypsum-based filling body can be reduced by excessive lime addition; the screening method, the ball milling method and the calcining method are complex to operate and high in cost, and are difficult to popularize and apply in the filling process of phosphorite production enterprises, and the ball milling method cannot carry out fundamental pretreatment on the phosphogypsum. Therefore, finding a novel phosphogypsum filling body preparation method based on phosphogypsum pretreatment with excellent pretreatment effect and low cost is the key of the phosphogypsum filling process.
Disclosure of Invention
The present invention is to solve the above technical problems, and a first object of the present invention is to provide a method for pretreating phosphogypsum.
The second purpose of the invention is to provide an application method of the phosphogypsum obtained by the pretreatment, and the phosphogypsum is used as a filling material.
A phosphogypsum pretreatment method comprises the steps of mixing phosphogypsum, heavy calcium carbonate and water, and slurrying to obtain phosphogypsum slurry; and (3) aging the phosphogypsum slurry to obtain the pretreated phosphogypsum (also called as pretreated phosphogypsum slurry in the invention).
In the invention, heavy calcium is originally adopted to pretreat the phosphogypsum, neutralize the acid of the phosphogypsum and fix harmful components in the phosphogypsum; in addition, the dissolution of harmful substances can be further and unexpectedly reduced and the strength of the obtained pretreated phosphogypsum can be improved by matching with an aging operation.
In the invention, by utilizing the characteristics that the heavy calcium has the functions of adjusting the pH value of the phosphogypsum and solidifying harmful components in the phosphogypsum, the phosphogypsum is pretreated through proper aging, the property of the phosphogypsum is fundamentally changed, the low-pH phosphogypsum can be used as a filling aggregate on a large scale, and the resource utilization rate of the low-pH phosphogypsum is greatly improved.
The phosphogypsum is preferably phosphogypsum powder, and the particle size of the powder is not particularly required.
The heavy calcium is preferably heavy calcium powder, the particle size is not particularly required, and the heavy calcium is preferably 300 meshes or more.
The heavy calcium can be industrial heavy calcium powder.
The inventor researches and discovers that the phosphogypsum is pretreated by heavy calcium powder, so that the effect of the phosphogypsum is better than that of the phosphogypsum pretreated by common calcium carbonate powder (light calcium powder); for example, the strength of the fillers obtained from pre-treated phosphogypsum can be surprisingly improved.
The parameters of the phosphogypsum such as pH value and the like change along with the change of conditions such as different phosphating plants, stacking time and the like, so that the chemical properties of the phosphogypsum are different, the filling technical requirements are met, and the addition amount of heavy calcium corresponding to the phosphogypsum with different pH values is different. In the method, the phosphogypsum is innovatively treated by the heavy calcium, and the addition amount of the heavy calcium is reasonably regulated and controlled according to the property of the phosphogypsum; for example, the pH of the slurried phosphogypsum slurry can be controlled by controlling the addition amount of heavy calcium.
Preferably, the heavy calcium is added in an amount such that the pH of the resulting phosphogypsum slurry is not less than 2; preferably 2 to 7; more preferably 2 to 4.
The proportion of the heavy calcium to the dry weight of the phosphogypsum is that the slurried phosphogypsum slurry is not less than 2; the specific adding proportion can be determined according to the quality of the phosphogypsum. In general, the proportion of heavy calcium to the dry weight of phosphogypsum is not less than 4 wt%; preferably 4 to 8 wt%.
The solid-liquid mass ratio in the phosphogypsum slurry has no special requirement and can be adjusted according to the use requirement; preferably, the solid-liquid mass ratio in the phosphogypsum slurry is not lower than 1; further preferably, the solid content of the slurry of the phosphogypsum is, for example, 50-60 wt%.
The inventor also finds that the aging treatment under the action of the heavy calcium can further synergistically improve the pretreatment effect, for example, further improve the strength of the obtained product and the curing effect of harmful substances.
Preferably, the aging treatment is static aging.
Further preferably, the aging temperature is room temperature. The room temperature is, for example, 20 to 35 ℃.
Preferably, the aging treatment time is not less than 2 hours. Too short an aging period will not improve the effect, and too long an aging period will not further improve the effect.
Further preferably, the aging treatment time is 2-4 h.
The pH value of the aged slurry (namely the treated pretreated phosphogypsum) is 2-7; preferably 2 to 4. Under the pretreated slurry, the application strength of the obtained slurry is further improved, and in addition, the release of harmful ingredients is further reduced.
The invention also provides an application of the phosphogypsum, and the pretreated phosphogypsum is prepared by utilizing the pretreatment method; the pretreated phosphogypsum is used as a filling material.
The inventor researches and discovers that the performance of the obtained pretreated phosphogypsum can be improved by matching the heavy calcium and the aged synergistic pretreatment, such as releasing harmful components fixed in the phosphogypsum and improving the strength of the application field of the phosphogypsum as a filling aggregate.
The application method disclosed by the invention is simple in process, low in cost, efficient in production, suitable for large-scale industrial application and capable of being used for preparing the phosphogypsum filling body with excellent filling performance.
Preferably, the pre-treated phosphogypsum is used as a mining fill aggregate.
Preferably, in the application, the pretreated phosphogypsum and the gelling agent are mixed uniformly to obtain the phosphogypsum filling slurry.
Further preferably, the phosphogypsum filling slurry is used in a filling mining process in the mining field.
Preferably, the use of phosphogypsum, the gelling agent may be any gelling material known to those skilled in the art of phosphogypsum filling; such as composite yellow phosphorus slag gelled powder, cement and the like.
The mass ratio of the phosphogypsum to the gelling agent has no special requirement, and can be properly controlled and adjusted according to the requirement, and in the invention, the mass ratio of the phosphogypsum to the gelling agent is preferably 2-4: 1
The blending operation can adopt the prior conventional method; the stirring time is not particularly required so as to uniformly mix the slurry, and the preferable stirring time is 30-45 min.
The invention discloses a preferable preparation method of an ardealite filling body pretreated by industrial heavy calcium powder, which comprises the following steps:
(1) weighing phosphogypsum powder and industrial heavy calcium powder, adding water, mixing and stirring uniformly to prepare phosphogypsum slurry. The proportion of the industrial heavy calcium powder to the dry weight of the phosphogypsum is 4-8%.
(2) Placing the prepared phosphogypsum slurry in room temperature (20 ℃), naturally reacting, standing and aging for 3 h. And after standing and aging, finishing the pretreatment of the phosphogypsum.
(3) Adding a gelling agent into the phosphogypsum slurry, and stirring for 30-45 min by using a stirrer to prepare filling slurry.
(4) And pouring the filling slurry into the mold to obtain a filling sample.
The invention has the beneficial effects that:
the invention realizes the pretreatment of the phosphogypsum by a pretreatment method of adding water, mixing, stirring and standing for aging the phosphogypsum and the industrial heavy calcium powder in advance, effectively improves the initial pH of the filling slurry, greatly reduces the release of harmful components in the effluent water of the prepared filling slurry, greatly improves the uniaxial compressive strength of a filling body sample, takes the situation that the mass concentration of the filling slurry is 50 percent, the addition amount of the heavy calcium is 8 percent of the mass of the phosphogypsum and the aging time is 3 hours as an example, the maximum uniaxial compressive strength of 28d and 60d reaches 0.28MPa and 0.57MPa, the slurry which is not added with the industrial heavy calcium powder is not solidified, and respectively rises by 75 percent and 20 percent compared with the situation that the slurry is not aged under the same condition. The release of harmful substances in the discharged water of the filling slurry added with the industrial heavy calcium carbonate powder is greatly reduced, the mass concentration of the filling slurry is 50 percent, the adding amount of the heavy calcium carbonate is 8 percent of the mass of the phosphogypsum, the concentrations of soluble fluorine and soluble phosphorus pentoxide in the discharged water of the filling slurry are 269.0mg/L and 8.95mg/L respectively when the filling slurry is aged for 3 hours, and compared with the condition that the industrial heavy calcium carbonate powder is not added, the concentrations are reduced by 45.4 percent and 47.2 percent respectively, and compared with the condition that the soluble fluorine is reduced by 42.6 percent under the same condition. The preparation method of the phosphogypsum filling material by adding the industrial heavy calcium powder and aging pretreatment improves the filling performance of the phosphogypsum-based filling material, reduces the release of harmful substances, greatly improves the resource utilization rate of the phosphogypsum, and reduces the phosphogypsum filling cost and the environmental protection burden of enterprises.
Detailed Description
The fresh phosphogypsum in the following examples and comparative examples is solid waste of phosphate fertilizer enterprises, and is from Guizhou Kaishu phosphorus (group) Limited liability company, the pH value of the phosphogypsum is 1.75, the water content is 10.00%, and the used industrial heavy calcium powder is a commercial product with the particle size of 400 meshes.
The heavy calcium is selected from industrial grade and provided by Guibao powder company Limited company manufacturers in the Gangxi Hezhou city.
The cementing material is made of the conventional material, and the composite yellow phosphorus slag powder is selected in the following examples and comparative examples and provided by Guizhou phosphorus-opened phosphogypsum comprehensive utilization company Limited.
Example 1:
step 1: weighing 3500g of phosphogypsum, 3713.5g of tap water and 126g of industrial heavy calcium carbonate powder, putting the industrial heavy calcium carbonate powder into a container, wherein the using amount of the industrial heavy calcium carbonate powder is 4% of the mass of the phosphogypsum, and stirring for 5min at the rotating speed of 200rpm by using a stirrer to prepare phosphogypsum slurry, wherein the pH value is 3.03;
step 2: and (3) standing and aging the phosphogypsum slurry obtained in the step 1 for 3 hours, and fully reacting, wherein the pH value is 2.67.
And step 3: adding 787.5g of gelling agent into the phosphogypsum slurry in the container in the step 1 according to the mass ratio of 4: 1 of the phosphogypsum to the gelling agent, and stirring for 30-45 min at the rotating speed of 200rpm by using a stirrer to prepare filling slurry with the mass concentration of 50%;
and 4, step 4: pouring the filling slurry obtained in the step 3 into a mold to obtain a filling sample.
Example 2:
step 1: weighing 3500g of phosphogypsum, 3839.5g of tap water and 252g of industrial heavy calcium carbonate powder, putting the industrial heavy calcium carbonate powder into a container, wherein the using amount of the industrial heavy calcium carbonate powder is 8 percent of the mass of the phosphogypsum, and stirring for 5min at the rotating speed of 200rpm by using a stirrer to prepare phosphogypsum slurry, wherein the pH value is 3.24;
step 2: and (3) standing and aging the phosphogypsum slurry obtained in the step 1 for 3 hours, and fully reacting, wherein the pH value is 3.38.
And step 3: adding 787.5g of gelling agent into the phosphogypsum slurry in the container in the step 1 according to the mass ratio of 4: 1 of the phosphogypsum to the gelling agent, and stirring for 30-45 min at the rotating speed of 200rpm by using a stirrer to prepare filling slurry with the mass concentration of 50%;
and 4, step 4: pouring the filling slurry obtained in the step 3 into a mold to obtain a filling sample.
Comparative example 1:
step 1: weighing 3500g of phosphogypsum and 3587.5g of tap water, putting into a container, and stirring for 5min at the rotation speed of 200rpm by using a stirrer to prepare phosphogypsum slurry, wherein the pH value is 1.78;
step 2: immediately adding 787.5g of gelling agent into the phosphogypsum slurry in the container in the step 1 according to the mass ratio of 4: 1 of the phosphogypsum to the gelling agent, and stirring for 30-45 min at the rotating speed of 200rpm by using a stirrer to prepare filling slurry with the mass concentration of 50%;
and step 3: pouring the filling slurry obtained in the step 2 into a mold to obtain a filling sample.
Comparative example 2:
step 1: weighing 3500g of phosphogypsum and 3587.5g of tap water, putting into a container, and stirring for 5min at the rotation speed of 200rpm by using a stirrer to prepare phosphogypsum slurry, wherein the pH value is 1.76;
step 2: standing the phosphogypsum slurry obtained in the step 1 for 3 hours, wherein the pH value is 1.77;
and step 3: adding 787.5g of gelling agent into the phosphogypsum slurry in the container in the step 1 according to the mass ratio of 4: 1 of the phosphogypsum to the gelling agent, and stirring for 30-45 min at the rotating speed of 200rpm by using a stirrer to prepare filling slurry with the mass concentration of 50%;
and 4, step 4: pouring the filling slurry obtained in the step 3 into a mold to obtain a filling sample.
Comparative example 3:
step 1: weighing 3500g of phosphogypsum, 3713.5g of tap water and 126g of industrial heavy calcium carbonate powder, putting the industrial heavy calcium carbonate powder into a container, wherein the using amount of the industrial heavy calcium carbonate powder is 4% of the mass of the phosphogypsum, and stirring for 5min at the rotating speed of 200rpm by using a stirrer to prepare phosphogypsum slurry, wherein the pH value is 3.05;
step 2: immediately adding 787.5g of gelling agent into the phosphogypsum slurry in the container in the step 1 according to the mass ratio of 4: 1 of the phosphogypsum to the gelling agent, and stirring for 30-45 min at the rotating speed of 200rpm by using a stirrer to prepare filling slurry with the mass concentration of 50%;
and step 3: pouring the filling slurry obtained in the step 2 into a mold to obtain a filling sample.
Comparative example 4:
step 1: weighing 3500g of phosphogypsum, 3839.5g of tap water and 252g of industrial heavy calcium carbonate powder, putting the industrial heavy calcium carbonate powder into a container, wherein the using amount of the industrial heavy calcium carbonate powder is 8 percent of the mass of the phosphogypsum, and stirring for 5min at the rotating speed of 200rpm by using a stirrer to prepare phosphogypsum slurry, wherein the pH value is 3.20;
step 2: immediately adding 787.5g of gelling agent into the phosphogypsum slurry in the container in the step 1 according to the mass ratio of 4: 1 of the phosphogypsum to the gelling agent, and stirring for 30-45 min at the rotating speed of 200rpm by using a stirrer to prepare filling slurry with the mass concentration of 50%;
and step 3: pouring the filling slurry obtained in the step 2 into a mold to obtain a filling sample.
Comparative example 5
Compared with the comparative example 4, the comparative example discusses that the pH value after aging is lower without aging and with less addition of industrial heavy calcium powder, and the specific steps are as follows:
step 1: weighing 3500g of phosphogypsum, 3603.3g of tap water and 15.8g of industrial heavy calcium carbonate powder into a container, wherein the using amount of the industrial heavy calcium carbonate powder is 0.5 percent of the mass of the phosphogypsum, and stirring for 5min at the rotating speed of 200rpm by using a stirrer to prepare phosphogypsum slurry, wherein the pH value is 2.76;
step 2: standing the phosphogypsum slurry obtained in the step 1 for 3 hours, wherein the pH value is 1.83;
and step 3: adding 787.5g of gelling agent into the phosphogypsum slurry in the container in the step 1 according to the mass ratio of 4: 1 of the phosphogypsum to the gelling agent, and stirring for 30-45 min at the rotating speed of 200rpm by using a stirrer to prepare filling slurry with the mass concentration of 50%;
and 4, step 4: pouring the filling slurry obtained in the step 3 into a mold to obtain a filling sample.
Comparative example 6
Compared with the example 2, the difference is only that the heavy calcium carbonate powder is replaced by the common calcium carbonate powder; other process parameters are the same.
Example 2 the strength of the filled samples 14d, 28d, and 60d to which the heavy calcium carbonate powder was added was 0.14MPa, 0.49MPa, and 0.60MPa, respectively, while the strength of the filled samples 14d, 28d, and 60d to which the ordinary calcium carbonate powder for experiments was added was 0.12MPa, 0.19MPa, and 0.35MPa, respectively, and it was found that the effect of adding the heavy calcium powder was superior to that of adding the ordinary calcium carbonate powder for experiments.
The filling slurry effluent water and filling samples obtained in the examples and the comparative examples are subjected to test analysis in the following specific test analysis mode:
1. and (3) measuring soluble impurities in the effluent water of the filling slurry: and taking a filling slurry sample from the stirred filling slurry, immediately putting the filling slurry sample into a centrifugal machine, centrifuging, taking out supernatant by using an injector, and filtering by using 0.45 mu m filter paper to obtain filtered secreted water for later use.
(1) Determination of soluble phosphorus pentoxide: 50ml of filtered secreted water is taken out by a pipette and transferred into a 50ml colorimetric tube with a plug, and then 1ml of 10% ascorbic acid solution is added into the colorimetric tube with the plug and mixed evenly. After 30s, 2ml of molybdate solution was added and mixed well, left for 15min and finally measured at a wavelength of 700nm using a cuvette and spectrophotometer.
(2) And (3) soluble fluorine determination: and (3) dividing and placing the properly filtered secreted water into a 50ml volumetric flask, regulating the secreted water to be nearly neutral by hydrochloric acid, then adding 10ml of fluorine ion strength regulation buffer solution, diluting with water to a constant volume and shaking up, then transferring the diluted volume into a 100ml polyethylene cup, placing a plastic stirrer, inserting a fluorine ion selective electrode, turning on a magnetic stirrer to stir at a constant speed, measuring a potential value during balance, and finally calculating the fluorine content.
2. And (3) measuring the maximum uniaxial compressive strength: the maximum uniaxial compressive strength of the filled samples was tested using a compression tester. The test piece was placed in the center of a pressure plate of a compression testing machine and loaded until failure using a loading rate of 0.5 mm/min.
The specific test results are shown in table 1.
TABLE 1
As can be seen from the data in Table 1, adding a proper amount of industrial heavy calcium carbonate powder and water into phosphogypsum to prepare slurry and aging the slurry can greatly improve the maximum uniaxial compressive strength of the phosphogypsum filling body and effectively reduce the content of harmful components in the discharged water of the filling slurry.
Claims (10)
1. A method for pretreating phosphogypsum used as a filling aggregate is characterized in that the phosphogypsum, heavy calcium carbonate and water are mixed and pulped to obtain phosphogypsum slurry; aging the phosphogypsum slurry to obtain pretreated phosphogypsum;
the adding amount of the heavy calcium is that the pH value of the obtained phosphogypsum slurry is not lower than 2;
the proportion of the heavy calcium in the dry weight of the phosphogypsum is not less than 4 wt%.
2. The method for pretreating phosphogypsum used as a filling aggregate according to claim 1, wherein the heavy calcium is added in an amount such that the pH of the obtained phosphogypsum slurry is 2-7.
3. A method of pre-treatment of phosphogypsum as a packing aggregate according to claim 1, characterised in that the solid-to-liquid ratio in the phosphogypsum slurry is not less than 1.
4. The method for the pre-treatment of phosphogypsum used as a packing aggregate according to claim 1, characterized in that the aging treatment is still aging; the aging temperature was room temperature.
5. The pretreatment method of phosphogypsum as a filling aggregate according to claim 1, characterized in that the pH of the aged slurry is 2-7.
6. The method for the pre-treatment of phosphogypsum used as a packing aggregate according to claim 1, characterized in that the aging time is not less than 2 h.
7. The application of the phosphogypsum is characterized in that the pretreated phosphogypsum is prepared by using the pretreatment method of the phosphogypsum used as the filling aggregate, which is disclosed by any one of claims 1 to 6; and then using the pretreated phosphogypsum as a filling aggregate.
8. Use of phosphogypsum according to claim 7, characterised in that the pre-treated phosphogypsum is used as a mining fill aggregate.
9. The use of phosphogypsum according to claim 8, characterized in that the pretreated phosphogypsum and the gelling agent are mixed to obtain a phosphogypsum filling slurry.
10. Use of phosphogypsum according to claim 9, characterised in that it is used in a fill mining process in the mining field.
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| CN110482889A (en) * | 2019-09-18 | 2019-11-22 | 云南凝创环保科技有限公司 | A kind of technique of bioanalysis pretreated ardealite |
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| 磷石膏膏体充填材料强度优化配比试验研究;张小瑞等;《矿冶工程》;20150430(第4期);第9-11页 * |
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| CN108516713A (en) | 2018-09-11 |
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