CN115215365B - Method for generating and separating gypsum from titanium extraction tailings - Google Patents
Method for generating and separating gypsum from titanium extraction tailings Download PDFInfo
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- CN115215365B CN115215365B CN202211020361.3A CN202211020361A CN115215365B CN 115215365 B CN115215365 B CN 115215365B CN 202211020361 A CN202211020361 A CN 202211020361A CN 115215365 B CN115215365 B CN 115215365B
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- 239000010440 gypsum Substances 0.000 title claims abstract description 119
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 119
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 70
- 239000010936 titanium Substances 0.000 title claims abstract description 70
- 238000000605 extraction Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000002002 slurry Substances 0.000 claims abstract description 190
- 238000000926 separation method Methods 0.000 claims abstract description 50
- 238000001914 filtration Methods 0.000 claims abstract description 48
- 238000002386 leaching Methods 0.000 claims abstract description 39
- 238000003756 stirring Methods 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 27
- 239000000654 additive Substances 0.000 claims abstract description 26
- 230000005484 gravity Effects 0.000 claims abstract description 15
- 230000000382 dechlorinating effect Effects 0.000 claims abstract description 7
- 239000012065 filter cake Substances 0.000 claims description 46
- 238000001354 calcination Methods 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 10
- 230000000996 additive effect Effects 0.000 claims description 9
- 238000000151 deposition Methods 0.000 claims description 9
- 238000006298 dechlorination reaction Methods 0.000 claims description 6
- 239000007790 solid phase Substances 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims 2
- 235000011130 ammonium sulphate Nutrition 0.000 claims 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims 2
- 229910052938 sodium sulfate Inorganic materials 0.000 claims 2
- 235000011152 sodium sulphate Nutrition 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 8
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012066 reaction slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
-
- 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
- C04B11/00—Calcium sulfate cements
- C04B11/005—Preparing or treating the raw materials
-
- 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
- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
-
- 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
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Metallurgy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for generating and separating gypsum from titanium extraction tailings, which comprises the following steps: (1) slurry leaching: adding water and additives into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction; wherein, the leaching reaction process generates gypsum; (2) slurry stirring: uniformly stirring the tailing slurry; (3) slurry separation: sending the tailings slurry to a hydrocyclone through a slurry pump for separation by gravity separation to obtain underflow tailings slurry and overflow gypsum slurry; (4) slurry filtration: and filtering the overflow gypsum slurry to obtain gypsum. According to the invention, the gypsum with higher purity is obtained by separating and filtering the gypsum generated by leaching reaction of the titanium extraction tailings and the dechlorinating agent, so that the separation effect is ensured, and meanwhile, the process is simple.
Description
Technical Field
The invention relates to the technical field of solid waste treatment and resource utilization, in particular to a method for generating and separating gypsum from titanium extraction tailings.
Background
In the prior art, the titanium extraction tailings are obtained after the titanium extraction of the blast furnace slag, and the titanium extraction tailings have better hydration activity, but the chloride ion content is up to 3 percent and is far higher than 0.06 percent of the requirements of slag micropowder. Therefore, the titanium extraction tailings are required to be subjected to dechlorination treatment, namely, after the titanium extraction tailings are added with additives for leaching reaction, the titanium extraction tailings are filtered, and the filter cake is calcined, so that the chloride ion content can be greatly reduced.
However, in the process of dechlorinating the titanium extraction tailings, a large amount of gypsum is formed by the reaction of the tailings and the additives, and the gypsum contains a large amount of crystal water, so that the crystal particles are fine, long-strip fiber-shaped, high in viscosity and high in filter pressing performance, the water content of a filter cake is high, and a large amount of calcining energy is consumed later.
No solution to overcome this technical problem exists in the prior art.
Disclosure of Invention
Accordingly, an object of the embodiments of the present invention is to provide a method for generating and separating gypsum from titanium extraction tailings, which reduces the content of crystal water in a filter cake by separating gypsum in the titanium extraction tailings, thereby saving energy consumption in a subsequent calcination step.
In view of the above, an aspect of an embodiment of the present invention provides a method for generating and separating gypsum from titanium extraction tailings, comprising the steps of: (1) slurry leaching: adding water and additives into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction; wherein, the leaching reaction process generates gypsum; (2) slurry stirring: uniformly stirring the tailing slurry; (3) slurry separation: sending the tailings slurry to a hydrocyclone through a slurry pump for separation by gravity separation to obtain underflow tailings slurry and overflow gypsum slurry; (4) slurry filtration: and filtering the overflow gypsum slurry to obtain gypsum.
In some embodiments, the additive is used to dechlorinate the titanium extracted tailings.
In some embodiments, the mass fraction of solid phase in the tailings slurry is between 10% and 50%.
In some embodiments, the gypsum in the solid phase is 3 to 20% by mass.
In some embodiments, in the step (3) of slurry separation, the number of stages of the reselection separation is not less than 1.
In some embodiments, the hydrocyclone has a diameter of 60-300mm; and the diameter of the sand depositing nozzle on the hydrocyclone is 10-40mm.
In some embodiments, in the (3) slurry separation step, the feed pressure is from 0.05 to 0.3MPa.
In some embodiments, in the (4) slurry filtering step, filtering the overflow gypsum slurry to obtain gypsum, comprising: and filtering the overflow gypsum slurry by using a normal pressure box type plate-and-frame filter press to obtain gypsum.
In another aspect of the embodiment of the invention, a method for deep dechlorination of titanium extraction tailings is provided, which comprises the following steps: (1) slurry leaching: adding water and additives into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction; wherein, the leaching reaction process generates gypsum; and the additive is used for dechlorinating the titanium extraction tailings; (2) slurry stirring: uniformly stirring the tailing slurry; (3) slurry separation: sending the tailings slurry to a hydrocyclone through a slurry pump for separation by gravity separation to obtain underflow tailings slurry and overflow gypsum slurry; (4) slurry filtration: filtering the underflow tailings slurry to obtain a tailings filter cake; (5) filter cake calcination: and calcining the tailing filter cake.
In some embodiments, in the (4) slurry filtering step, filtering the underflow tailings slurry to obtain a tailings cake, comprising: and filtering the underflow tailings slurry by using an atmospheric pressure box type plate-and-frame filter press to obtain a tailings filter cake.
The invention has the following beneficial technical effects: the titanium-removing tailings after the dechlorinating agent is added are sent into a hydrocyclone with preset size with preset force to be stirred and separated, so that gypsum and filter cakes with higher purity are obtained; gypsum can be used as a material, and slag micropowder can be obtained after the filter cake is calcined; most of the crystal water in the titanium-removing tailings is separated along with gypsum, the water content of the filter cake is low, and the calcining energy consumption is reduced, so that the calcining cost is saved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention and that other embodiments may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of generating and separating gypsum from titanium extracted tailings provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
As required, detailed embodiments of the present invention are disclosed in the present specification; however, it is to be understood that the embodiments disclosed herein are merely exemplary of the invention that may be embodied in various and alternative forms. In the following description, a number of operating parameters and components are described in terms of various embodiments contemplated. These specific parameters and components are presented as examples and are not meant to be limiting.
In view of the above, a first aspect of the embodiments of the present invention provides an embodiment of a method of generating and separating gypsum from titanium extraction tailings. FIG. 1 is a flow chart illustrating a method of generating and separating gypsum from titanium extracted tailings in accordance with the present invention. As shown in fig. 1, the method for generating and separating gypsum from titanium extraction tailings comprises the following steps: (1) slurry leaching: adding water and additives into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction; wherein, gypsum is generated in the leaching reaction process; (2) slurry stirring: uniformly stirring the tailing slurry; (3) slurry separation: sending the tailings slurry to a hydrocyclone through a slurry pump for separation by gravity separation to obtain underflow tailings slurry and overflow gypsum slurry; (4) slurry filtration: and filtering the overflow gypsum slurry to obtain gypsum. The method can obtain the gypsum with small crystal granularity, light density and large grain size and heavy density in the tailings slurry, and the gypsum and the tailings are fully dispersed in the ore slurry by stirring and can be separated by a reselection device. According to the invention, the gypsum in the titanium extraction tailings is separated and filtered, the operation mode is environment-friendly and feasible, the gypsum with higher purity is obtained, the resource utilization rate of the titanium extraction tailings is improved, and more economic benefits are brought to the titanium extraction industry of the blast furnace slag.
In some embodiments, the additive is used to dechlorinate the titanium extraction tailings. Wherein the titanium extraction tailings are waste residues obtained after titanium extraction of titanium-containing blast furnace slag. In the prior art, the titanium extraction tailings have good hydration activity, but the chloride ion content is as high as 3 percent, which is far higher than 0.06 percent of the requirements of slag micropowder. Therefore, the titanium extraction tailings need to be subjected to dechlorination treatment. Optionally, in the step of (1) leaching the slurry, the ratio of the amount of water added to the mass of the titanium extraction tailings is 1:1-6:1, and the types of the additives may include at least one of the following: the amount of the additive can be 3-15% of the mass of the tailings of titanium extraction.
On the basis of the above embodiment, the embodiment of the present invention may further include: in the step (3) of slurry separation, the number of stages of the gravity separation is more than or equal to 1. Further, the diameter of the hydrocyclone is 60-300mm; and the diameter of the sand depositing nozzle on the hydrocyclone is 10-40mm. Still further, in the slurry separation step (3), the feeding pressure is 0.05 to 0.3MPa. The invention mixes the tailing slurry evenly, sends the tailing slurry into the hydrocyclone for separation, gypsum mainly enters overflow, and titanium-extracted tailings enters underflow, and the ideal separation effect can be obtained by reasonably controlling the pressure, the diameter of the hydrocyclone and the size of the sand settling nozzle.
In some embodiments, the mass fraction of solid phase in the tailings slurry is between 10% and 50%. Further, the mass content of gypsum in the solid phase is 3-20%. It can be understood that the titanium extraction tailings are filtered after being added with additives for leaching reaction, and the filter cake is calcined, so that the chloride ion content can be greatly reduced. In the leaching reaction process, the tailings react with the additive to form a large amount of gypsum, the crystal granularity is very small and is basically in a strip shape below 10um and even in a nm level under the influence of stirring during the reaction, and 90% of the titanium extraction tailings have the granularity above 30um, the density is far greater than that of the gypsum, and the method has good reselection separation conditions.
Further, in the step of (4) filtering the slurry, the overflow gypsum slurry is filtered to obtain gypsum, comprising: and filtering the overflow gypsum slurry by using a normal pressure box type plate-and-frame filter press to obtain gypsum.
In another aspect of the embodiment of the invention, a method for deep dechlorination of titanium extraction tailings is provided, which comprises the following steps: (1) slurry leaching: adding water and additives into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction; wherein, gypsum is generated in the leaching reaction process; the additive is used for dechlorinating the titanium extraction tailings; (2) slurry stirring: uniformly stirring the tailing slurry; (3) slurry separation: sending the tailings slurry to a hydrocyclone through a slurry pump for separation by gravity separation to obtain underflow tailings slurry and overflow gypsum slurry; (4) slurry filtration: filtering the underflow tailings slurry to obtain a tailings filter cake; (5) filter cake calcination: calcining the tailing filter cake. The invention has simple process, short flow, low cost, good separation effect and high efficiency, the tailings slurry is stirred uniformly and then is directly pumped into the hydrocyclone, thus realizing the separation of gypsum, the gypsum removal rate can reach more than 95 percent, the water content of the tailings filter cake is reduced by more than 10 percent, thereby reducing the energy consumption of the subsequent calcination process, reducing the sulfur dioxide content in the flue gas and reducing the sulfur content of the calcined product.
In some embodiments, in (4) the slurry filtration step, the underflow tailings slurry is filtered to yield a tailings filter cake comprising: and filtering the underflow tailings slurry by using an atmospheric pressure box type plate-and-frame filter press to obtain a tailings filter cake.
The present invention will be specifically described below by way of specific examples and comparative examples.
The example and the comparative example use the titanium extraction tailings of chemical enterprises, water and dechlorinating agent are added into the titanium extraction tailings, and the tailings slurry is obtained after leaching reaction; wherein, the pulp concentration of the tailing slurry is 30%, and the main chemical compositions of the obtained solid matters after filtration and drying are shown in the table 1:
TABLE 1 major Components (wt.%) of cake of reaction slurry for extracting titanium tailings
Example 1
The embodiment is to apply the method for generating and separating gypsum from the titanium extraction tailings, which is provided by the invention, to realize the separation of gypsum, and specifically comprises the following steps:
(1) And (3) slurry leaching: adding water and additives into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) Separating slurry: sending the tailings slurry to a hydrocyclone through a slurry pump for separation by gravity separation to obtain underflow tailings slurry and overflow gypsum slurry; the diameter of the hydrocyclone is 180mm; the diameter of the sand depositing nozzle on the hydrocyclone is 25mm; the feeding pressure is 0.15MPa;
(4) And (3) slurry filtration: press-filtering the overflow gypsum slurry by using a normal pressure box type plate-and-frame filter press to obtain gypsum; and filter-pressing the underflow tailings slurry through an atmospheric pressure box type plate-and-frame filter press to obtain a tailings filter cake; wherein the maximum feed pressure is 9kg/cm 2 ；
Gypsum and tailings filter cake can be obtained using the process of example 1. The water content of the tailing filter cake is detected to be 15.9%, and the gypsum content in the tailing filter cake is quantitatively analyzed to be 1.8% through XRD phase; whereas the gypsum obtained by filtration was found to have a purity of 82% by analysis.
Example 2
The embodiment is to apply the method for generating and separating gypsum from the titanium extraction tailings, which is provided by the invention, to realize the separation of gypsum, and specifically comprises the following steps:
(1) And (3) slurry leaching: adding water and additives into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) Separating slurry: sending the tailings slurry to a hydrocyclone through a slurry pump for separation by gravity separation to obtain primary underflow tailings slurry and primary overflow gypsum slurry; the diameter of the hydrocyclone is 180mm; the diameter of the sand depositing nozzle on the hydrocyclone is 25mm; the feeding pressure is 0.15MPa;
(4) Stirring the primary underflow tailings slurry: uniformly stirring the primary underflow tailings slurry;
(5) And (3) separating primary underflow tailings slurry: sending the primary underflow tailings slurry to a hydrocyclone through a slurry pump for separation by gravity separation to obtain secondary underflow tailings slurry and secondary overflow gypsum slurry; the diameter of the hydrocyclone is 150mm; the diameter of the sand depositing nozzle on the hydrocyclone is 16mm; the feed pressure was 0.16MPa;
(6) And (3) slurry mixing: mixing the first-stage overflow gypsum slurry with the second-stage overflow gypsum slurry to obtain overflow gypsum slurry;
(7) And (3) slurry filtration: press-filtering the overflow gypsum slurry by using a normal pressure box type plate-and-frame filter press to obtain gypsum; and press-filtering the secondary underflow tailings slurry through an atmospheric pressure box type plate-and-frame filter press to obtain a tailings filter cake; wherein the maximum feed pressure is 9kg/cm 2 ；
Gypsum and tailings filter cake can be obtained using the process of example 2. The water content of the tailing filter cake is detected to be 15.1%, and the gypsum content in the tailing filter cake is quantitatively analyzed to be 0.6% through XRD phase; whereas gypsum obtained by filtration was found to have a purity of 78% by analysis.
Example 3
The embodiment is to apply the method for generating and separating gypsum from the titanium extraction tailings, which is provided by the invention, to realize the separation of gypsum, and specifically comprises the following steps:
(1) And (3) slurry leaching: adding water and additives into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) Separating slurry: sending the tailings slurry to a hydrocyclone through a slurry pump for separation by gravity separation to obtain underflow tailings slurry and overflow gypsum slurry; the diameter of the hydrocyclone is 260mm; the diameter of the sand depositing nozzle on the hydrocyclone is 35mm; the feed pressure was 0.25MPa;
(4) And (3) slurry filtration: press-filtering the overflow gypsum slurry by using a normal pressure box type plate-and-frame filter press to obtain gypsum; and filter-pressing the underflow tailings slurry through an atmospheric pressure box type plate-and-frame filter press to obtain a tailings filter cake; wherein the maximum feed pressure is 9kg/cm 2 ；
Gypsum and tailings filter cake can be obtained using the process of example 3. The water content of the tailing filter cake is detected to be 16.5%, and the gypsum content in the tailing filter cake is quantitatively analyzed to be 2.5% through XRD phase; whereas gypsum obtained by filtration was found to have a purity of 88% by analysis.
Example 4
The embodiment is to apply the method for generating and separating gypsum from the titanium extraction tailings, which is provided by the invention, to realize the separation of gypsum, and specifically comprises the following steps:
(1) And (3) slurry leaching: adding water and additives into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) Separating slurry: sending the tailings slurry to a hydrocyclone through a slurry pump for separation by gravity separation to obtain underflow tailings slurry and overflow gypsum slurry; the diameter of the hydrocyclone is 60mm; the diameter of the sand depositing nozzle on the hydrocyclone is 10mm; the feeding pressure is 0.05MPa;
(4) And (3) slurry filtration: press-filtering the overflow gypsum slurry by using a normal pressure box type plate-and-frame filter press to obtain gypsum; and filter-pressing the underflow tailings slurry through an atmospheric pressure box type plate-and-frame filter press to obtain a tailings filter cake; wherein the maximum feed pressure is 9kg/cm 2 ；
Gypsum and tailings filter cake can be obtained using the process of example 4. The water content of the tailing filter cake is detected to be 18.9%, and the gypsum content in the tailing filter cake is quantitatively analyzed to be 3.2% through XRD phase; whereas the gypsum obtained by filtration was found to have a purity of 82% by analysis.
Example 5
The embodiment is to apply the method for generating and separating gypsum from the titanium extraction tailings, which is provided by the invention, to realize the separation of gypsum, and specifically comprises the following steps:
(1) And (3) slurry leaching: adding water and additives into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) Separating slurry: sending the tailings slurry to a hydrocyclone through a slurry pump for separation by gravity separation to obtain underflow tailings slurry and overflow gypsum slurry; the diameter of the hydrocyclone is 300mm; the diameter of the sand depositing nozzle on the hydrocyclone is 40mm; the feeding pressure is 0.3MPa;
(4) And (3) slurry filtration: press-filtering the overflow gypsum slurry by using a normal pressure box type plate-and-frame filter press to obtain gypsum; and filter-pressing the underflow tailings slurry through an atmospheric pressure box type plate-and-frame filter press to obtain a tailings filter cake; wherein the maximum feed pressure is 9kg/cm 2 ；
Gypsum and tailings filter cake can be obtained using the process of example 5. The water content of the tailing filter cake is detected to be 18.3%, and the gypsum content in the tailing filter cake is quantitatively analyzed to be 2.9% through XRD phase; whereas gypsum obtained by filtration was found to have a purity of 78% by analysis.
Comparative example 1
The comparative example specifically comprises the following steps:
(1) And (3) slurry leaching: adding water and additives into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) Separating slurry: sending the tailings slurry into a normal pressure box type plate-and-frame filter press through a slurry pump to obtain a tailings filter cake; wherein the maximum feed pressure is 9kg/cm 2 ；
The process can be used for obtaining a tailing filter cake. The water content of the tailing filter cake is detected to be 27.8%, and the gypsum content in the tailing filter cake is quantitatively analyzed to be 13.2% through XRD.
The method for generating and separating gypsum from the titanium extraction tailings has the characteristics of simple process, short flow, low cost, good separation effect and high efficiency, the gypsum removal rate can reach more than 95%, the water content of the tailings filter cake is reduced by more than 10%, the energy consumption of the subsequent calcination process is reduced, the sulfur dioxide content in the flue gas is reduced, and the sulfur content of the calcined product is reduced. The technical effect of the embodiment of the present invention is not achieved by the scheme of the comparative example.
The foregoing examples merely illustrate embodiments of the invention and are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A method for generating and separating gypsum from titanium-extracted tailings, the method comprising the steps of:
(1) And (3) slurry leaching: adding water and additives into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction; wherein the leaching reaction process produces gypsum, and the additive comprises at least one of the following: ammonium sulfate, sodium sulfate, aluminum sulfate, and ferric sulfate;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) Separating slurry: sending the tailings slurry to a hydrocyclone through a slurry pump for separation by gravity separation to obtain underflow tailings slurry and overflow gypsum slurry;
(4) And (3) slurry filtration: and filtering the overflow gypsum slurry to obtain gypsum.
2. The method of generating and separating gypsum from titanium extracted tailings of claim 1 wherein the additive is used to dechlorinate the titanium extracted tailings.
3. The method of producing and separating gypsum from titanium extracted tailings of claim 1 wherein the mass fraction of solid phase in the tailings slurry is between 10% and 50%.
4. A method of producing and separating gypsum from titanium extracted tailings as claimed in claim 3 wherein the gypsum in the solid phase is present in an amount of 3 to 20% by mass.
5. The method of producing and separating gypsum from titanium extracted tailings of claim 1 wherein in said (3) slurry separating step, the number of stages of the gravity separation is equal to or greater than 1.
6. The method of generating and separating gypsum from titanium extracted tailings of claim 1 wherein the hydrocyclone has a diameter in the range of 60-300mm; and
the diameter of the sand depositing nozzle on the hydrocyclone is 10-40mm.
7. The method of producing and separating gypsum from titanium extracted tailings of claim 1 wherein in said (3) slurry separating step, the feed pressure is in the range of 0.05 to 0.3MPa.
8. The method of generating and separating gypsum from titanium extracted tailings of claim 1 wherein in said (4) slurry filtering step, filtering said overflow gypsum slurry to provide gypsum, comprising:
and filtering the overflow gypsum slurry by using a normal pressure box type plate-and-frame filter press to obtain gypsum.
9. The method for deep dechlorination of the titanium extraction tailings is characterized by comprising the following steps of:
(1) And (3) slurry leaching: adding water and additives into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction; wherein, the leaching reaction process generates gypsum; and
the additive is used for dechlorinating the titanium extraction tailings, and comprises at least one of the following components: ammonium sulfate, sodium sulfate, aluminum sulfate, and ferric sulfate;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) Separating slurry: sending the tailings slurry to a hydrocyclone through a slurry pump for separation by gravity separation to obtain underflow tailings slurry and overflow gypsum slurry;
(4) And (3) slurry filtration: filtering the underflow tailings slurry to obtain a tailings filter cake;
(5) And (3) calcining a filter cake: and calcining the tailing filter cake.
10. The method of deep dechlorination of titanium extracted tailings of claim 9 wherein in said (4) slurry filtering step, filtering said underflow tailings slurry to provide a tailings cake comprising:
and filtering the underflow tailings slurry by using an atmospheric pressure box type plate-and-frame filter press to obtain a tailings filter cake.
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| US5215672A (en) * | 1992-09-01 | 1993-06-01 | The Babcock & Wilcox Company | Purification of FGD gypsum product |
| DE20111900U1 (en) * | 2001-07-09 | 2001-10-18 | Ver Energiewerke Ag | Arrangement for the continuous blowdown of a washer |
| CN110002779A (en) * | 2019-05-17 | 2019-07-12 | 攀钢集团攀枝花钢铁研究院有限公司 | With the method for titanium extraction tailings production slag micropowder |
| CN110510651A (en) * | 2019-08-13 | 2019-11-29 | 昆明川金诺化工股份有限公司 | The method and device thereof of atrament in a kind of abjection ardealite |
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| US5215672A (en) * | 1992-09-01 | 1993-06-01 | The Babcock & Wilcox Company | Purification of FGD gypsum product |
| DE20111900U1 (en) * | 2001-07-09 | 2001-10-18 | Ver Energiewerke Ag | Arrangement for the continuous blowdown of a washer |
| CN110002779A (en) * | 2019-05-17 | 2019-07-12 | 攀钢集团攀枝花钢铁研究院有限公司 | With the method for titanium extraction tailings production slag micropowder |
| CN110510651A (en) * | 2019-08-13 | 2019-11-29 | 昆明川金诺化工股份有限公司 | The method and device thereof of atrament in a kind of abjection ardealite |
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