CN115215365A - 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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- CN115215365A CN115215365A CN202211020361.3A CN202211020361A CN115215365A CN 115215365 A CN115215365 A CN 115215365A CN 202211020361 A CN202211020361 A CN 202211020361A CN 115215365 A CN115215365 A CN 115215365A
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 121
- 239000010440 gypsum Substances 0.000 title claims abstract description 121
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 74
- 239000010936 titanium Substances 0.000 title claims abstract description 74
- 238000000605 extraction Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000002002 slurry Substances 0.000 claims abstract description 191
- 238000001914 filtration Methods 0.000 claims abstract description 38
- 238000002386 leaching Methods 0.000 claims abstract description 38
- 238000000926 separation method Methods 0.000 claims abstract description 38
- 238000003756 stirring Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000000654 additive Substances 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 230000000996 additive effect Effects 0.000 claims abstract description 22
- 230000005484 gravity Effects 0.000 claims abstract description 18
- 230000000382 dechlorinating effect Effects 0.000 claims abstract description 7
- 239000012065 filter cake Substances 0.000 claims description 49
- 238000001354 calcination Methods 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 10
- 239000007790 solid phase Substances 0.000 claims description 6
- 238000006298 dechlorination reaction Methods 0.000 claims description 3
- 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
- 239000012071 phase Substances 0.000 description 6
- 238000004445 quantitative analysis Methods 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000005265 energy consumption 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
- 239000002245 particle Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 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
- 239000000470 constituent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000835 fiber Substances 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
- 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
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- 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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- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Metallurgy (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 an additive into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction; wherein the leaching reaction produces gypsum; (2) stirring the slurry: uniformly stirring the tailing slurry; and (3) separating slurry: conveying the tailing slurry to a hydrocyclone through a slurry pump for gravity separation to obtain underflow tailing slurry and overflow gypsum slurry; (4) slurry filtering: and filtering the overflow gypsum slurry to obtain gypsum. According to the invention, the gypsum generated by the leaching reaction of the titanium extraction tailings and the dechlorinating agent is separated and filtered, so that the gypsum with higher purity is obtained, and the separation effect is ensured while 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, titanium extraction tailings can be obtained after titanium extraction of blast furnace slag, the titanium extraction tailings have good hydration activity, but the chloride ion content of the titanium extraction tailings is up to 3 percent and is far higher than 0.06 percent of the requirement of slag micro powder. Therefore, the titanium extraction tailings need to be dechlorinated, namely, the titanium extraction tailings are added with additives to be leached and reacted, then are filtered, and filter cakes are calcined, so that the content of chloride ions 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, the gypsum contains a large amount of crystal water, the crystal particles of the gypsum are fine and are in a strip fiber shape, the viscosity is high, the filter pressing performance is influenced, the water content of a filter cake is high, and a large amount of calcination energy consumption is consumed subsequently.
There is no solution to overcome this technical problem in the prior art.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide a method for generating and separating gypsum from titanium extraction tailings, in which the content of crystal water in a filter cake is reduced by separating gypsum from the titanium extraction tailings, so as to save energy consumption in a subsequent calcination step.
In view of the above objects, an aspect of the embodiments 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 an additive into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction; wherein the leaching reaction produces gypsum; (2) stirring the slurry: uniformly stirring the tailing slurry; and (3) separating slurry: conveying the tailing slurry to a hydrocyclone through a slurry pump for gravity separation to obtain underflow tailing 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 extraction tailings.
In some embodiments, the tailings slurry has a mass fraction of solid phase of 10% to 50%.
In some embodiments, the gypsum in the solid phase is present in an amount of 3 to 20% by mass.
In some embodiments, in the (3) slurry separation step, the number of stages of the gravity separation is greater than or equal to 1.
In some embodiments, the hydrocyclone has a diameter of 60-300mm; and the diameter of the sand settling 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, the overflow gypsum slurry is filtered to obtain gypsum, including: 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 embodiments of the present invention, a method for deep dechlorination of titanium extraction tailings is provided, which includes the following steps: (1) slurry leaching: adding water and an additive into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction; wherein the leaching reaction produces gypsum; the additive is used for dechlorinating the titanium extraction tailings; (2) stirring the slurry: uniformly stirring the tailing slurry; (3) slurry separation: conveying the tailing slurry to a hydrocyclone through a slurry pump for gravity separation to obtain underflow tailing slurry and overflow gypsum slurry; (4) slurry filtration: filtering the underflow tailing slurry to obtain a tailing filter cake; (5) calcining the filter cake: and calcining the tailings filter cake.
In some embodiments, in the (4) slurry filtration step, the underflow tailings slurry is filtered to obtain a tailings filter cake, comprising: and filtering the underflow tailing slurry through a normal-pressure box type plate-and-frame filter press to obtain a tailing filter cake.
The invention has the following beneficial technical effects: feeding the titanium-removed tailings added with the dechlorinating agent into a hydrocyclone with a preset size at a preset force, and performing stirring and separation operations to obtain high-purity gypsum and a filter cake; gypsum can be used as a material, and slag micro powder can be obtained after the filter cake is calcined; most of crystal water in the titanium-removing tailings is separated out along with the gypsum, the water content of a 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 present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.
FIG. 1 is a flow chart of a method for generating and separating gypsum from titanium extraction tailings provided by the 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 are 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 disclosed embodiments are merely exemplary of the invention that may be embodied in various and alternative forms. In the following description, various operating parameters and components are described in various embodiments as contemplated. These specific parameters and components are used in this specification as examples only and are not meant to be limiting.
In view of the above objects, a first aspect of an embodiment of the present invention is directed to an embodiment of a method for generating and separating gypsum from titanium extraction tailings. FIG. 1 is a flow chart of a method for generating and separating gypsum from titanium extraction tailings provided by the invention. As shown in figure 1, the method for generating and separating gypsum from titanium extraction tailings comprises the following steps: (1) slurry leaching: adding water and an additive into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction; wherein gypsum is generated in the process of leaching reaction; (2) stirring the slurry: uniformly stirring the tailing slurry; (3) slurry separation: conveying the tailing slurry to a hydrocyclone through a slurry pump for gravity separation to obtain underflow tailing slurry and overflow gypsum slurry; (4) slurry filtration: and filtering the overflow gypsum slurry to obtain gypsum. The obtained gypsum in the tailing slurry has small crystal particle size and light density, the tailing slurry has large particle size and heavy density, the gypsum and the tailing slurry are fully dispersed in the ore slurry through stirring, and separation can be realized through gravity separation equipment. According to the invention, the gypsum in the titanium extraction tailings is separated and filtered, the operation mode is environment-friendly and easy to implement, 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 titanium extraction tailings. Wherein the titanium extraction tailings refer to waste residues obtained after titanium extraction of the titanium-containing blast furnace slag. It should be noted that in the prior art, the titanium extraction tailings have good hydration activity, but the chloride ion content is as high as 3%, which is far higher than 0.06% of the requirement of slag micro powder. Therefore, the titanium extraction tailings need to be dechlorinated. Optionally, in the step (1) of leaching the slurry, the ratio of the amount of the added water to the mass of the titanium extraction tailings is 1 to 6, and the types of the additives may include at least one of: the amount of the additive can be 3-15% of the mass of the titanium extraction tailings.
On the basis of the above embodiment, the implementation manner of the present invention may further include: in the step (3) of separating the slurry, the stage number of gravity separation is more than or equal to 1. Further, the diameter of the hydrocyclone is 60-300mm; and the diameter of the sand settling nozzle on the hydrocyclone is 10-40mm. Still further, in the step (3) of separating the slurry, the feed pressure is 0.05 to 0.3MPa. The invention mixes the slurry of the tailings, then sends the mixture into the hydrocyclone for separation, the gypsum mainly enters into the overflow, and the titanium tailings enter into the 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 weight fraction of solid phase in the tailings slurry is between 10% and 50%. Furthermore, the gypsum in the solid phase accounts for 3 to 20 percent by mass. It can be understood that the content of chloride ions can be greatly reduced by adding an additive into titanium extraction tailings, leaching, filtering, and calcining filter cakes. It should be noted that in the leaching reaction process, the tailings react with the additive to form a large amount of gypsum, which is influenced by stirring during the reaction, the crystal grain size is very small, basically in a strip shape below 10um, even in a nm grade, while the titanium extraction tailings have a grain size of 90% above 30um, and the density of the titanium extraction tailings is far greater than that of the gypsum, so that the titanium extraction tailings have good gravity separation conditions.
Further, in (4) the slurry filtering step, the overflow gypsum slurry is filtered to obtain gypsum, including: 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 embodiments of the present invention, a method for deep dechlorination of titanium extraction tailings is provided, which includes the following steps: (1) slurry leaching: adding water and an additive into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction; wherein gypsum is generated in the process of leaching reaction; the additive is used for dechlorinating the titanium extraction tailings; (2) stirring the slurry: uniformly stirring the tailing slurry; (3) slurry separation: conveying the tailing slurry to a hydrocyclone through a slurry pump for gravity separation to obtain underflow tailing slurry and overflow gypsum slurry; (4) slurry filtering: filtering the underflow tailing slurry to obtain a tailing filter cake; (5) calcining the filter cake: and calcining the tailings filter cake. The method has the advantages of simple process, short flow, low cost, good separation effect and high efficiency, the tailings slurry is directly pumped into the hydrocyclone after being uniformly stirred, the separation of the gypsum is realized, the gypsum removal rate can reach more than 95 percent, and the water content of the tailings filter cake is reduced by more than 10 percent, so that the energy consumption of the subsequent calcining process is reduced, the sulfur dioxide content in the flue gas is reduced, and the sulfur content of the calcined product is reduced.
In some embodiments, in (4) the slurry filtration step, the underflow tailings slurry is filtered to obtain a tailings filter cake comprising: and filtering the underflow tailing slurry by using a normal-pressure box type plate-and-frame filter press to obtain a tailing filter cake.
The present invention is specifically described below by way of specific examples and comparative examples.
The embodiment and the comparative example use titanium extraction tailings of chemical enterprises, water and a dechlorinating agent are added into the titanium extraction tailings, and tailings slurry is obtained after leaching reaction; wherein, the ore pulp concentration of the tailing slurry is 30%, and the main chemical components of the solid obtained after filtering and drying are shown in the table 1:
TABLE 1 extraction of the main constituents of the titanium tailings reaction slurry filter cake (weight percent, wt%)
Example 1
In this embodiment, the method for generating and separating gypsum from titanium extraction tailings provided by the present invention is used to realize gypsum separation, and specifically includes the following steps:
(1) Leaching slurry: adding water and an additive into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) And (3) separating slurry: conveying the tailing slurry to a hydrocyclone through a slurry pump for gravity separation to obtain underflow tailing slurry and overflow gypsum slurry; the diameter of the hydrocyclone is 180mm; the diameter of the upper sand settling nozzle of the hydrocyclone is 25mm; and the feeding pressure is 0.15MPa;
(4) Slurry filtering: carrying out filter pressing on the overflow gypsum slurry by using a normal-pressure box type plate-and-frame filter press to obtain gypsum; filter-pressing the underflow tailings slurry by a normal-pressure box-type plate-and-frame filter press to obtain tailings filter cakes; wherein the maximum feed pressure is 9kg/cm 2 ；
Gypsum and tailings filter cakes can be obtained using the process of example 1. Wherein the water content of the tailings filter cake is 15.9% through detection, and the gypsum content in the tailings filter cake is 1.8% through XRD phase quantitative analysis; the gypsum obtained by filtration was found to have a purity of 82% by analysis.
Example 2
In the embodiment, the method for generating and separating gypsum from titanium extraction tailings provided by the invention is used for realizing the separation of gypsum, and specifically comprises the following steps:
(1) Leaching the slurry: adding water and an additive into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) And (3) separating slurry: conveying the tailing slurry to a hydrocyclone through a slurry pump for gravity separation to obtain primary underflow tailing slurry and primary overflow gypsum slurry; the diameter of the hydrocyclone is 180mm; the diameter of the upper sand settling nozzle of the hydrocyclone is 25mm; and a feed pressure of 0.15MPa;
(4) Stirring the first-stage underflow tailing slurry: uniformly stirring the first-stage underflow tailing slurry;
(5) Separating primary underflow tailings slurry: conveying the primary underflow tailing slurry to a hydrocyclone for gravity separation through a slurry pump to obtain secondary underflow tailing slurry and secondary overflow gypsum slurry; the diameter of the hydrocyclone is 150mm; the diameter of the upper sand settling nozzle of the hydrocyclone is 16mm; and a feed pressure of 0.16MPa;
(6) Mixing the slurry: mixing the primary overflow gypsum slurry and the secondary overflow gypsum slurry to obtain overflow gypsum slurry;
(7) Filtering the slurry: carrying out filter pressing on the overflow gypsum slurry by using a normal-pressure box type plate-and-frame filter press to obtain gypsum; performing filter pressing on the secondary underflow tailings slurry by using a normal-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 cakes can be obtained using the process of example 2. Wherein, the water content of the tailing filter cake is 15.1% through detection, and the gypsum content in the tailing filter cake is 0.6% through XRD phase quantitative analysis; the gypsum obtained by filtration was found to be 78% pure by analysis.
Example 3
In this embodiment, the method for generating and separating gypsum from titanium extraction tailings provided by the present invention is used to realize gypsum separation, and specifically includes the following steps:
(1) Leaching slurry: adding water and an additive into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) And (3) separating slurry: conveying the tailing slurry to a hydrocyclone through a slurry pump for gravity separation to obtain underflow tailing slurry and overflow gypsum slurry; the diameter of the hydrocyclone is 260mm; the diameter of the upper sand settling nozzle of the hydrocyclone is 35mm; and a feed pressure of 0.25MPa;
(4) Slurry filtering: carrying out filter pressing on the overflow gypsum slurry by using a normal-pressure box type plate-and-frame filter press to obtain gypsum; filter-pressing the underflow tailings slurry by a normal-pressure box-type plate-and-frame filter press to obtain tailings filter cakes; wherein the maximum feed pressure is 9kg/cm 2 ；
Gypsum and tailings filter cakes were obtained using the procedure of example 3. Wherein, the water content of the tailing filter cake is detected to be 16.5 percent, and the gypsum content in the tailing filter cake is 2.5 percent through XRD phase quantitative analysis; the gypsum obtained by filtration was found to be 88% pure by analysis.
Example 4
In this embodiment, the method for generating and separating gypsum from titanium extraction tailings provided by the present invention is used to realize gypsum separation, and specifically includes the following steps:
(1) Leaching the slurry: adding water and an additive into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) And (3) separating slurry: conveying the tailing slurry to a hydrocyclone through a slurry pump for gravity separation to obtain underflow tailing slurry and overflow gypsum slurry; the diameter of the hydrocyclone is 60mm; the diameter of the upper sand settling nozzle of the hydrocyclone is 10mm; and a feed pressure of 0.05MPa;
(4) Filtering the slurry: carrying out filter pressing on the overflow gypsum slurry by using a normal-pressure box type plate-and-frame filter press to obtain gypsum; and filter-pressing the underflow tailing slurry through a normal-pressure box-type plate-and-frame filter press to obtain a tailing filter cake; wherein the maximum feeding pressure is 9kg/cm 2 ；
Gypsum and tailings filter cakes were obtained using the procedure of example 4. Wherein the water content of the tailings filter cake is 18.9% through detection, and the gypsum content in the tailings filter cake is 3.2% through XRD phase quantitative analysis; the gypsum obtained by filtration was found to have a purity of 82% by analysis.
Example 5
In the embodiment, the method for generating and separating gypsum from titanium extraction tailings provided by the invention is used for realizing the separation of gypsum, and specifically comprises the following steps:
(1) Leaching the slurry: adding water and an additive into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) And (3) separating slurry: conveying the tailing slurry to a hydrocyclone through a slurry pump for gravity separation to obtain underflow tailing slurry and overflow gypsum slurry; the diameter of the hydrocyclone is 300mm; the diameter of the upper sand settling nozzle of the hydrocyclone is 40mm; and the feeding pressure is 0.3MPa;
(4) Filtering the slurry: carrying out filter pressing on the overflow gypsum slurry by using a normal-pressure box type plate-and-frame filter press to obtain gypsum; filter-pressing the underflow tailings slurry by a normal-pressure box-type plate-and-frame filter press to obtain tailings filter cakes; wherein the maximum feeding pressure is 9kg/cm 2 ；
Gypsum and tailings filter cakes were obtained using the procedure of example 5. Wherein the water content of the tailings filter cake is 18.3% through detection, and the gypsum content in the tailings filter cake is 2.9% through XRD phase quantitative analysis; the gypsum obtained by filtration was found to be 78% pure by analysis.
Comparative example 1
The comparative example specifically included the following steps:
(1) Leaching slurry: adding water and an additive into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) And (3) separating slurry: sending the tailing slurry into a normal-pressure box-type plate-and-frame filter press through a slurry pump to obtain a tailing filter cake; wherein the maximum feed pressure is 9kg/cm 2 ；
The tailings filter cake can be obtained by adopting the process. Wherein, the water content of the tailings filter cake is 27.8% through detection, and the gypsum content in the tailings filter cake is 13.2% through XRD phase quantitative analysis.
The method for generating and separating the 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%, and the water content of the tailings filter cake is reduced by more than 10%, so that the energy consumption of the subsequent calcining 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 above examples only show the embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for generating and separating gypsum from titanium extraction tailings is characterized by comprising the following steps:
(1) Leaching the slurry: adding water and an additive into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction; wherein the leaching reaction produces gypsum;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) And (3) separating slurry: conveying the tailing slurry to a hydrocyclone through a slurry pump for gravity separation to obtain underflow tailing slurry and overflow gypsum slurry;
(4) Filtering the slurry: and filtering the overflow gypsum slurry to obtain gypsum.
2. The method of generating and separating gypsum from titanium extraction tailings of claim 1 wherein the additive is used to dechlorinate the titanium extraction tailings.
3. The method for generating and separating gypsum from titanium extraction tailings as claimed in claim 1, wherein the mass fraction of the solid phase in the tailings slurry is 10-50%.
4. The method for generating and separating gypsum from titanium extraction tailings as claimed in claim 3, wherein the gypsum in the solid phase is 3-20% by mass.
5. The method for generating and separating gypsum from titanium extraction tailings according to claim 1, wherein in the (3) slurry separation step, the number of the gravity separation stages is more than or equal to 1.
6. The method for generating and separating gypsum from titanium extraction tailings as claimed in claim 1, wherein the diameter of the hydrocyclone is 60-300mm; and
the diameter of the sand settling nozzle on the hydrocyclone is 10-40mm.
7. The method for generating and separating gypsum from titanium extraction tailings according to claim 1, wherein in the (3) slurry separation step, the feeding pressure is 0.05-0.3MPa.
8. The method for generating and separating gypsum from titanium extraction tailings as claimed in claim 1, wherein in the (4) slurry filtering step, 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.
9. The method for deep dechlorination of the titanium extraction tailings is characterized by comprising the following steps of:
(1) Leaching slurry: adding water and an additive into the titanium extraction tailings, and obtaining tailings slurry after leaching reaction; wherein the leaching reaction produces gypsum; and
the additive is used for dechlorinating the titanium extraction tailings;
(2) Stirring the slurry: uniformly stirring the tailing slurry;
(3) And (3) separating slurry: conveying the tailing slurry to a hydrocyclone through a slurry pump for gravity separation to obtain underflow tailing slurry and overflow gypsum slurry;
(4) Slurry filtering: filtering the underflow tailing slurry to obtain a tailing filter cake;
(5) And (3) calcining a filter cake: and calcining the tailing filter cake.
10. The method for generating and separating gypsum from titanium tailings as claimed in claim 9, wherein in the (4) slurry filtering step, the underflow tailings slurry is filtered to obtain a tailings filter cake, comprising:
and filtering the underflow tailing slurry by using a normal-pressure box type plate-and-frame filter press to obtain a tailing filter cake.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116272850A (en) * | 2023-05-09 | 2023-06-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation of porous adsorption material by titanium extraction tailings coupled mineralization and CO sequestration 2 Method and application of (2) |
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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 | VEAG Vereinigte Energiewerke AG, 10115 Berlin | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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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 | VEAG Vereinigte Energiewerke AG, 10115 Berlin | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116272850A (en) * | 2023-05-09 | 2023-06-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation of porous adsorption material by titanium extraction tailings coupled mineralization and CO sequestration 2 Method and application of (2) |
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