CN115367809A - Method for preparing polymeric ferric sulfate by using potassium feldspar acid leaching iron removal wastewater - Google Patents
Method for preparing polymeric ferric sulfate by using potassium feldspar acid leaching iron removal wastewater Download PDFInfo
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- CN115367809A CN115367809A CN202211043263.1A CN202211043263A CN115367809A CN 115367809 A CN115367809 A CN 115367809A CN 202211043263 A CN202211043263 A CN 202211043263A CN 115367809 A CN115367809 A CN 115367809A
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- potassium feldspar
- ferric sulfate
- polymeric ferric
- sulfuric acid
- acid leaching
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- 238000000034 method Methods 0.000 title claims abstract description 70
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 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 title claims abstract description 56
- 229910000360 iron(III) sulfate Inorganic materials 0.000 title claims abstract description 56
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000002253 acid Substances 0.000 title claims abstract description 54
- 238000002386 leaching Methods 0.000 title claims abstract description 51
- 239000002351 wastewater Substances 0.000 title claims abstract description 48
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 33
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 120
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000002699 waste material Substances 0.000 claims abstract description 43
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 30
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 29
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 29
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 29
- 239000007787 solid Substances 0.000 claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 12
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000001704 evaporation Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 239000012295 chemical reaction liquid Substances 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract 9
- 238000002425 crystallisation Methods 0.000 claims description 2
- 230000008025 crystallization Effects 0.000 claims description 2
- 238000004064 recycling Methods 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 239000003054 catalyst Substances 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract 1
- 235000010215 titanium dioxide Nutrition 0.000 description 25
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 21
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 235000010288 sodium nitrite Nutrition 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 229910001448 ferrous ion Inorganic materials 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- FWFGVMYFCODZRD-UHFFFAOYSA-N oxidanium;hydrogen sulfate Chemical compound O.OS(O)(=O)=O FWFGVMYFCODZRD-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/14—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention belongs to the technical field of chemical wastewater treatment, and relates to a method for preparing polymeric ferric sulfate by using potassium feldspar acid leaching iron removal wastewater. The method comprises the following steps: evaporating and crystallizing the potassium feldspar acid leaching iron removal wastewater to obtain a solid containing ferrous sulfate, adding water to dissolve the solid containing ferrous sulfate, mixing the dissolved solid with waste sulfuric acid for producing titanium dioxide by a sulfuric acid method, continuously stirring and heating to 30-45 ℃, introducing ozone into the bottom of the liquid, and drying and molding the reaction liquid to obtain the polymeric ferric sulfate. The method for preparing the polymeric ferric sulfate by using the potassium feldspar acid leaching iron removal wastewater has the advantages of simple equipment, short production period, no catalyst used in the reaction, no impurity in the obtained polymeric ferric sulfate, high stability and realization of recycling of the potassium feldspar acid leaching iron removal wastewater and the waste sulfuric acid generated in the production of titanium dioxide by a sulfuric acid method.
Description
Technical Field
The invention belongs to the technical field of chemical wastewater treatment, and relates to a method for preparing polymeric ferric sulfate by using potassium feldspar acid leaching iron removal wastewater.
Background
Potassium feldspar is an important industrial raw material, and natural potash feldspar ore generally contains more iron, so that the economic value of the potassium feldspar is reduced, and the application of the potassium feldspar in various industrial fields is also prevented. The acid leaching and iron removal of potassium feldspar is an important method for producing pure potassium feldspar powder, but the method can generate a large amount of acidic waste liquid, the main components of the acidic waste liquid are metal ions such as iron, aluminum, potassium, magnesium and the like and free sulfuric acid or hydrochloric acid, and serious water environment pollution can be caused if the acidic waste liquid is directly discharged without treatment.
Titanium dioxide is widely applied to industries such as paint, plastics, papermaking, printing ink, chemical fiber, rubber and the like, and the demand of titanium dioxide is continuously increased along with the industrial development of the society. The production technology of titanium dioxide at the present stage still mainly adopts a sulfuric acid method, and a large amount of waste is generated, wherein the waste comprises ferrous sulfate heptahydrate, waste sulfuric acid, acid waste gas and the like. If the three wastes discharged by the production are not well treated by enterprises, the environment can be greatly damaged. The existing methods for treating the waste sulfuric acid are roughly three, namely direct utilization, neutralization reaction and reuse after concentration. The amount of treatment acid used directly is too small, while taking into account the transport radius. The neutralization reaction is to directly neutralize titanium white waste sulfuric acid with lime and then discharge the neutralized waste sulfuric acid, and the method still causes pollution to the environment. The concentration cost of the waste sulfuric acid is too high due to the fact that the impurity content in the waste sulfuric acid is high, scaling is easy to occur in the concentration process and other reasons.
Polyferric sulfate is a common flocculant and is widely applied to the field of sewage treatment. The preparation of the polymeric ferric sulfate mainly comprises a direct oxidation method and a catalytic oxidation method. In industrial production, the polymeric ferric sulfate is generally oxidized by acid solution containing ferrous sulfate under the catalysis of sodium nitrite, and the process generally requires longer reaction time and higher temperature, and consumes more energy. The process route for preparing the polymeric ferric sulfate by adopting the direct oxidation method is simple, and the equipment can be reduced when the polymeric ferric sulfate is used for industrial productionInvestment and production links, reduce equipment costs, but such production processes must rely on oxidizing agents, such as: h 2 O 2 、KClO 3 、HNO 3 And the like inorganic oxidizing agents.
CN103318975B discloses a method for recycling waste residues and waste sulfuric acid in the production of titanium dioxide by a sulfuric acid process, which comprises: oxidizing ferrous sulfate in the titanium dioxide waste residue into ferric sulfate; then adding a reducing agent, reducing and decomposing ferric sulfate into iron oxide slag and sulfur dioxide gas, preparing the obtained sulfur dioxide gas into sulfuric acid, returning the sulfuric acid to the acidolysis process in the titanium dioxide production process, returning the iron oxide slag obtained by decomposition to the oxidation reaction kettle to prepare ferric sulfate, carrying out reduction decomposition reaction, and carrying out the circular operation. The remaining iron oxide slag is used as a raw material for steel mills and iron oxide-based pigments. CN112707446A discloses a preparation method of polymeric ferric sulfate, which comprises mixing ferrous sulfate aqueous solution with acid I, heating and fully mixing uniformly to obtain a first solution; adding sodium nitrite and a cocatalyst into the first solution, controlling the temperature to 50-60 ℃, adding an oxidant, and fully reacting to obtain a second solution; cooling the second solution, filtering and keeping filter residue; wherein the cocatalyst comprises porous ceramic, the oxidant comprises oxygen, and the mass ratio of the sodium nitrite to the ferrous sulfate is (0.6-0.15): 1. The above patents respectively disclose a recycling method of waste sulfuric acid from titanium dioxide production by sulfuric acid process and a method for preparing polymeric ferric sulfate, but no literature reports about a method for preparing polymeric ferric sulfate by using potassium feldspar acid leaching iron-removing wastewater and waste sulfuric acid from titanium dioxide production by sulfuric acid process.
The acid leaching and iron removal of potassium feldspar and the production of titanium dioxide powder by a sulfuric acid method are widely applied to industrial production, but the generated wastewater and waste sulfuric acid cannot be comprehensively recycled, so that the resource waste is caused, and the environmental pollution is also brought. Therefore, the method for preparing the polymeric ferric sulfate by using the potassium feldspar acid leaching iron removal wastewater is provided, and the environmental pollution is reduced while the chemical production waste resource recovery is realized.
Disclosure of Invention
The invention aims to recycle the acid leaching and iron removing wastewater of potassium feldspar and the waste sulfuric acid for producing titanium dioxide by a sulfuric acid method.
In view of the above, the present application addresses this need in the art by providing a method for preparing polymeric ferric sulfate using potassium feldspar acid leaching iron removal wastewater.
On one hand, the invention relates to a method for preparing polymeric ferric sulfate by using potassium feldspar acid leaching iron removal wastewater, which comprises the following steps: evaporating and crystallizing potassium feldspar acid leaching iron removal wastewater to obtain a solid containing ferrous sulfate, adding water to dissolve the solid containing ferrous sulfate, mixing the dissolved solid with waste sulfuric acid produced in the production of titanium dioxide by a sulfuric acid method, stirring and heating to 30-45 ℃, introducing ozone into the bottom of the liquid, and drying the reaction liquid to obtain the polymeric ferric sulfate.
Further, in the method for preparing polymeric ferric sulfate by using the potassium feldspar acid leaching iron removal wastewater, the mass concentration of sulfuric acid in the waste sulfuric acid for producing titanium dioxide by the sulfuric acid method is 75-98%.
Further, in the method for preparing polymeric ferric sulfate by using the potassium feldspar acid leaching iron-removing wastewater, the pH value of the solid containing ferrous sulfate after being dissolved in water and mixed with the waste sulfuric acid for producing titanium dioxide by a sulfuric acid method is 0.6-1.0.
Further, in the method for preparing polymeric ferric sulfate by using the potassium feldspar acid leaching iron removal wastewater, the mass fraction of ferrous sulfate in the ferrous sulfate-containing solid is 80-99% by mass ratio.
Further, in the method for preparing polymeric ferric sulfate by using potassium feldspar acid leaching iron-removing wastewater, the solid containing ferrous sulfate is dissolved in water, and each 100g of the solid containing ferrous sulfate is dissolved in 50mL of water.
Further, in the method for preparing polymeric ferric sulfate by using the potassium feldspar acid leaching iron removal wastewater, the evaporative crystallization is performed for 1-3 hours at 90-110 ℃.
Further, in the method for preparing polymeric ferric sulfate by using the potassium feldspar acid leaching iron removal wastewater, the stirring and heating time is 1-5h, and the stirring speed of the stirring and heating is 200-500rpm.
Further, in the method for preparing polymeric ferric sulfate by using the potassium feldspar acid leaching iron removal wastewater, the ozone introducing speed is 20-100m/s, and the introducing time is 10-120 min.
The invention fully utilizes the ion distribution characteristics of the potassium feldspar acid leaching iron-removing wastewater and the waste sulfuric acid for producing the titanium dioxide by the sulfuric acid method, and achieves the aim of recycling the waste sulfuric acid from the potassium feldspar acid leaching iron-removing wastewater and the titanium dioxide by the sulfuric acid method to produce the polymeric ferric sulfate. The invention further claims polymeric ferric sulfate prepared by the method for preparing polymeric ferric sulfate by using the potassium feldspar acid leaching iron-removing wastewater, and application of the method for preparing polymeric ferric sulfate by using the potassium feldspar acid leaching iron-removing wastewater in treatment of potassium feldspar acid leaching iron-removing waste or waste in production of titanium dioxide by a sulfuric acid method.
Compared with the prior art, the invention has the following beneficial effects or advantages:
the method for preparing the polymeric ferric sulfate by using the potassium feldspar acid leaching iron-removing wastewater provided by the invention has the advantages of simple equipment, short production period, no catalyst used in the reaction, no impurity in the obtained polymeric ferric sulfate and high stability, and realizes the recycling of the potassium feldspar acid leaching iron-removing wastewater and the waste sulfuric acid generated in the production of titanium dioxide by a sulfuric acid method.
Detailed Description
The following examples are given to illustrate the technical means of the present invention, but the present invention is not limited to the following examples.
Example 1
The embodiment provides a test for preparing polymeric ferric sulfate by using potassium feldspar acid leaching iron-removal wastewater and waste sulfuric acid generated in titanium dioxide production by a sulfuric acid method.
Evaporating and crystallizing the potassium feldspar acid leaching iron removal wastewater for 1h at 90 ℃ to obtain a solid containing ferrous sulfate. Taking 100g of potassium feldspar acid leaching iron removal wastewater, evaporating and crystallizing to obtain a solid containing ferrous sulfate, adding 50mL of water to dissolve the solid containing ferrous sulfate, adding waste sulfuric acid with the mass concentration of 75% for producing titanium dioxide by a sulfuric acid method until the pH value is 0.6, keeping 200rpm and stirring until ozone introduction is finished, heating to 30 ℃, introducing ozone into the bottom of the liquid at 20m/s for 10min, and drying the reaction liquid to obtain 5g of polymeric ferric sulfate.
Example 2
This example provides a test of using potassium feldspar acid leaching iron removal wastewater and sulfuric acid waste from titanium dioxide production by sulfuric acid process to prepare polymeric ferric sulfate.
Evaporating and crystallizing the potassium feldspar acid leaching iron removal wastewater for 2 hours at 100 ℃ to obtain a solid containing ferrous sulfate. Taking 100g of potassium feldspar acid leaching iron removal wastewater, evaporating and crystallizing to obtain a solid containing ferrous sulfate, adding 50mL of water to dissolve the solid containing ferrous sulfate, adding waste sulfuric acid with the mass concentration of 85% for producing titanium dioxide by a sulfuric acid method until the pH value is 0.8, keeping the stirring at 400rpm until ozone introduction is finished, heating to 40 ℃, introducing ozone into the bottom of the liquid at 50m/s for 90min, and drying the reaction liquid to obtain 7g of polymeric ferric sulfate.
Example 3
The embodiment provides a test for preparing polymeric ferric sulfate by using potassium feldspar acid leaching iron-removal wastewater and waste sulfuric acid generated in titanium dioxide production by a sulfuric acid method.
Evaporating and crystallizing the potassium feldspar acid-leaching iron-removing wastewater for 2 hours at 100 ℃ to obtain a solid containing ferrous sulfate. Taking 100g of potassium feldspar acid leaching iron removal wastewater, evaporating and crystallizing to obtain a solid containing ferrous sulfate, adding 50mL of water to dissolve the solid containing ferrous sulfate, adding 98% of waste sulfuric acid for producing titanium dioxide by a sulfuric acid method until the pH value is 1.0, keeping 500rpm and stirring until ozone introduction is finished, heating to 45 ℃, introducing ozone into the bottom of the liquid at 100m/s for 120min, and drying the reaction liquid to obtain 10g of polymeric ferric sulfate.
Example 4
This example provides a performance test of the polymeric ferric sulfates prepared in examples 1-3.
The polyferric sulfate obtained in example 1-3 was taken and the mass fractions of substances such as iron content, ferrous ion and the like in the product were measured according to the method in GB/T14591-2016 "Polyferric sulfate Water treatment agent". The results are shown in Table 1.
TABLE 1 Performance preparation and testing of polymeric ferric sulfate products
As can be seen from Table 1, the polymeric ferric sulfate prepared by the invention meets the product requirements of GB/T14591-2016 (polymeric ferric sulfate as a water treatment agent), the obtained polymeric ferric sulfate does not contain impurities and has high stability, and the recycling of potassium feldspar acid leaching iron-removing wastewater and waste sulfuric acid generated in the production of titanium dioxide by a sulfuric acid method is realized.
As described above, the present invention can be preferably implemented, and the above-mentioned embodiments are merely descriptions of preferred embodiments of the present invention, and do not limit the scope of the present invention, and various changes and modifications made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the present invention.
Claims (10)
1. A method for preparing polymeric ferric sulfate by using potassium feldspar acid leaching iron removal wastewater is characterized by comprising the following steps: evaporating and crystallizing potassium feldspar acid leaching iron removal wastewater to obtain a solid containing ferrous sulfate, adding water to dissolve the solid containing ferrous sulfate, mixing the dissolved solid with waste sulfuric acid produced in the production of titanium dioxide by a sulfuric acid method, stirring and heating to 30-45 ℃, introducing ozone into the bottom of the liquid, and drying the reaction liquid to obtain the polymeric ferric sulfate.
2. The method for preparing polymeric ferric sulfate by using the potassium feldspar acid leaching iron-removal wastewater as claimed in claim 1, wherein the mass concentration of sulfuric acid in the waste sulfuric acid from the sulfuric acid method production of titanium dioxide is 75-98%.
3. The method for preparing polymeric ferric sulfate by using the potassium feldspar acid leaching iron-removal wastewater as claimed in claim 1, wherein the pH value of the solid containing ferrous sulfate after being dissolved in water and mixed with the waste sulfuric acid from the titanium dioxide production by the sulfuric acid method is 0.6-1.0.
4. The method for preparing polymeric ferric sulfate by using the potassium feldspar acid leaching iron-removal wastewater as claimed in claim 1, wherein the mass fraction of the ferrous sulfate in the ferrous sulfate-containing solid is 80-99% by mass ratio.
5. The method for preparing polymeric ferric sulfate by using the potassium feldspar acid leaching iron-removing wastewater as claimed in claim 1, wherein the solid containing the ferrous sulfate is dissolved in 50mL of water per 100g of the solid containing the ferrous sulfate by adding water.
6. The method for preparing polymeric ferric sulfate by using the potassium feldspar acid leaching iron-removing wastewater as claimed in claim 1, wherein the evaporative crystallization is performed at 90-110 ℃ for 1-3h.
7. The method for preparing polymeric ferric sulfate by using potassium feldspar acid leaching iron-removal wastewater according to claim 1, wherein the stirring and heating time is 1-5h, and the stirring speed of the stirring and heating is 200-500rpm.
8. The method for preparing polymeric ferric sulfate by using potassium feldspar acid leaching iron-removing wastewater as claimed in claim 1, wherein the ozone introducing speed is 20-100m/s, and the introducing time is 10min-120min.
9. The polymeric ferric sulfate is characterized by being prepared by the method for preparing the polymeric ferric sulfate by using the potassium feldspar acid leaching iron removal wastewater according to any one of claims 1 to 8.
10. The use of the method for preparing polymeric ferric sulfate by using the potassium feldspar acid leaching iron removal wastewater of any one of claims 1 to 8 in the treatment of potassium feldspar acid leaching iron removal waste or waste from the production of titanium dioxide by a sulfuric acid process.
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|---|---|---|---|---|
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| CN106241890A (en) * | 2016-08-25 | 2016-12-21 | 常州清流环保科技有限公司 | A kind of production method of bodied ferric sulfate |
| CN108046335A (en) * | 2017-11-29 | 2018-05-18 | 兰州理工大学白银新材料研究院 | A kind of solid ferric polysulfate preparation method |
| US20220135425A1 (en) * | 2020-10-30 | 2022-05-05 | LB Group Co., Ltd. | Method for Co-Producing Synthetical Rutile and Polymeric Ferric Sulfate with Waste Sulfuric Acid |
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