CN113998912A - Composite powdery chromium removal agent and preparation method and application thereof - Google Patents
Composite powdery chromium removal agent and preparation method and application thereof Download PDFInfo
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- CN113998912A CN113998912A CN202111412460.1A CN202111412460A CN113998912A CN 113998912 A CN113998912 A CN 113998912A CN 202111412460 A CN202111412460 A CN 202111412460A CN 113998912 A CN113998912 A CN 113998912A
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- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 116
- 239000011651 chromium Substances 0.000 title claims abstract description 116
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 239000002131 composite material Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 title abstract description 48
- 239000004568 cement Substances 0.000 claims abstract description 48
- RYYXDZDBXNUPOG-UHFFFAOYSA-N 4,5,6,7-tetrahydro-1,3-benzothiazole-2,6-diamine;dihydrochloride Chemical compound Cl.Cl.C1C(N)CCC2=C1SC(N)=N2 RYYXDZDBXNUPOG-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229940099596 manganese sulfate Drugs 0.000 claims abstract description 17
- 239000011702 manganese sulphate Substances 0.000 claims abstract description 17
- 235000007079 manganese sulphate Nutrition 0.000 claims abstract description 17
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 16
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 11
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 11
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical group O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 claims description 18
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 16
- 235000006708 antioxidants Nutrition 0.000 claims description 10
- 239000011668 ascorbic acid Substances 0.000 claims description 8
- 229960005070 ascorbic acid Drugs 0.000 claims description 8
- 235000010323 ascorbic acid Nutrition 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 abstract description 6
- 238000007254 oxidation reaction Methods 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract description 2
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 12
- 229910052760 oxygen Inorganic materials 0.000 description 12
- 239000001301 oxygen Substances 0.000 description 12
- 239000000126 substance Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000011790 ferrous sulphate Substances 0.000 description 6
- 235000003891 ferrous sulphate Nutrition 0.000 description 6
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 6
- 230000001603 reducing effect Effects 0.000 description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 description 4
- 235000011152 sodium sulphate Nutrition 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- BUUPQKDIAURBJP-UHFFFAOYSA-N sulfinic acid Chemical compound OS=O BUUPQKDIAURBJP-UHFFFAOYSA-N 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000010757 Reduction Activity Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical group [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
Classifications
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/60—Methods for eliminating alkali metals or compounds thereof, e.g. from the raw materials or during the burning process; methods for eliminating other harmful components
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Public Health (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention provides a composite powdery chromium remover and a preparation method and application thereof, and the composite powdery chromium remover comprises the following components: 30-60% of reducing agent, 20-50% of thiourea dioxide, 5-30% of manganese sulfate and 0.1-5% of antioxidant. The dosage of the composite powdery chromium removing agent is 0.05-0.1 percent of the mass of the cement. Compared with the prior art, the composite powdery chromium remover provided by the invention adopts four raw materials for compounding, so that the composite powdery chromium remover has better oxidation resistance, can slow down the oxidation of a reducing agent, and can improve the chromium removal efficiency.
Description
Technical Field
The invention belongs to the technical field of cement, and particularly relates to a composite powdery chromium remover as well as a preparation method and application thereof.
Background
The cement chromium removing agent is mainly used in cement production to reduce hexavalent chromium in cement into trivalent chromium, so that the content of hexavalent chromium in cement is reduced. With the limit of the water-deep chromium in the cement and the specification of a measuring method issued and implemented in 2016, the standard requirement of the content of the water-soluble chromium in the cement is strictly limited, so that the quality control requirement of each large cement manufacturer is greatly improved, and the technical requirement of the treatment of the water-deep chromium in the cement product is further improved.
The chromium removing agent is common reducing agent with various types, most of the reducing agents are easy to oxidize, and some reducing agents are gradually oxidized by oxygen in the air and lose the reducing performance. Ferrous sulfate is a common chromium removing agent, is cheap in valence chromium and has good reducing performance, but the ferrous sulfate is easily oxidized in the air and gradually loses the reducing performance.
Disclosure of Invention
The invention aims to provide a composite powdery chromium remover and a preparation method thereof.
The invention also provides application of the composite powdery chromium remover, which is used for removing chromium from cement.
The specific technical scheme of the invention is as follows:
the invention provides a composite powdery chromium remover which comprises the following components in percentage by mass:
30-60% of reducing agent, 20-50% of thiourea dioxide, 5-30% of manganese sulfate and 0.1-5% of antioxidant.
The reducing agent is ferrous sulfate heptahydrate.
The antioxidant is ascorbic acid.
The invention provides a preparation method of a composite powdery chromium remover, which comprises the following steps:
and (3) uniformly mixing and stirring the reducing agent, the thiourea dioxide, the manganese sulfate and the antioxidant according to the formula ratio.
The invention provides an application of a composite powdery chromium remover, which is used for removing chromium from cement.
The composite powdery chromium remover is used for removing chromium from cement, and the dosage of the composite powdery chromium remover is 0.05-0.1 percent of the mass of the cement.
Compared with the prior art, the composite powdery chromium remover provided by the invention adopts four raw materials for compounding, so that the composite powdery chromium remover has better oxidation resistance, can slow down the oxidation of a reducing agent, and can improve the chromium removal efficiency.
Detailed Description
The invention provides a composite powdery chromium remover which comprises the following components in percentage by mass:
30-60% of reducing agent, 20-50% of thiourea dioxide, 5-30% of manganese sulfate and 0.1-5% of antioxidant.
The reducing agent is ferrous sulfate heptahydrate.
The antioxidant is ascorbic acid.
Ferrous sulfate heptahydrate is easily oxidized in air and loses reduction activity, and the chromium remover contains thiourea dioxide and manganese sulfate in a certain proportion, and the two substances are hardly influenced by oxygen, particularly thiourea dioxide. The hexavalent chromium content in the cement can be effectively reduced by adding the ferrous sulfate heptahydrate, but the ferrous sulfate is easily oxidized by oxygen in the air. Thiourea dioxide is a normally non-oxidizing and reducing substance that is not oxidized by oxygen in the air, is very stable, and readily decomposes under alkaline conditions to produce sulfinic acid having a very strong reducing property. Manganese sulfate is a reducing substance which is stable in air but has poor reducing power. The ascorbic acid is used as an antioxidant to delay or retard the addition of substances added in the chromium removing agent, wherein the substances can retard the oxidation of the chromium removing component and protect the reducibility of the chromium removing component.
Example 1
A composite powdery chromium removing agent comprises the following components in percentage by mass:
58.6% of ferrous sulfate heptahydrate, 31.5% of thiourea dioxide, 9% of manganese sulfate and 0.9% of ascorbic acid.
The preparation method of the composite powdery chromium removing agent specifically comprises the following steps: mixing and stirring uniformly the ferrous sulfate heptahydrate, thiourea dioxide, manganese sulfate and ascorbic acid according to the formula amount to obtain the compound.
The application of the composite powdery chromium remover is used for removing chromium from cement.
The chromium removing effect of the composite powdery chromium removing agent is as follows:
respectively doping the solid powdery chromium removal agent and the high-chromium cement according to the mass ratio of one thousandth to five ten thousandth, putting the mixture into a sample mixer for sample mixing, and taking out a mixed sample after one hour; for comparison, the hexavalent chromium content was measured according to the national standard method without adding a chromium removing agent, and the results are shown in table 1.
Table 1 shows the hexavalent chromium content without the addition of the chromium removing agent and after the addition of the chromium removing agent with different amounts
| Cement (without chromium remover) | 12.5mg/kg |
| Cement (one thousandth chromium remover) | Not detected out |
| Cement (five-ten-thousandth dechromization agent) | Not detected out |
And (3) carrying out an oxygen introduction test on the cement sample doped with the chromium removing agent:
adding the chromium removal agent of the embodiment 1 with the content of one thousandth of the mass of cement and one ten thousandth of the mass of cement into high-chromium cement respectively, mixing samples in a sample mixer, putting the cement after mixing the samples into a sampling barrel, introducing high-purity oxygen three times a day, introducing the pure oxygen for three minutes each time, shaking the cement in the sampling barrel in the oxygen introducing process, ensuring that the cement is fully contacted with oxygen, and detecting the chromium content; the results are shown in Table 2 for comparison without addition of a chromium removing agent.
Table 2 is a graph comparing the hexavalent chromium content of the sample without oxygen supply with the hexavalent chromium content of the sample after 4 days and 7 days of oxygen supply
And (4) conclusion: by comparing the oxygen introduction experiments of 4 and 7 days on the cement sample doped with one-thousandth and five-ten-thousandth chromium removal agents, the phenomenon that the content of hexavalent chromium is not increased is found, and the fact that the hexavalent chromium in the cement can be prevented from being oxidized by pure oxygen by adding the chromium removal agent is proved to have certain oxidation resistance.
Carrying out chemical component analysis on the cement sample doped with the chromium removing agent:
for the same cement samples, the following were used: the results of the loss on ignition and chemical analysis experiments were performed on three samples obtained without adding the chromium remover, the chromium remover prepared in example 1 doped with one thousandth of cement, and the chromium remover prepared in example 1 doped with five ten thousandth of cement, and are shown in Table 3.
Table 3 shows the chemical property tests of cement samples not doped with chromium remover and doped with chromium remover in different amounts
| No chromium removing agent is added | One thousandth of | Five percent in ten thousand | |
| Loss on ignition | 1.03 | 1.04 | 1.08 |
| Sodium oxide | 0.20 | 0.21 | 0.19 |
| Magnesium oxide | 1.06 | 1.06 | 1.06 |
| Aluminum oxide | 5.30 | 5.22 | 5.28 |
| Silicon dioxide | 20.92 | 20.84 | 20.86 |
| Sulfur trioxide | 2.44 | 2.46 | 2.46 |
| Potassium oxide | 0.60 | 0.62 | 0.56 |
| Calcium oxide | 64.28 | 63.34 | 64.24 |
| Titanium dioxide | 0.28 | 0.28 | 0.28 |
| Ferric oxide | 3.10 | 3.10 | 3.11 |
| Chloride ion | 0.012 | 0.013 | 0.013 |
The experimental results are as follows: through the comparison of the data of no addition of the chromium removing agent, one thousandth of doping and five ten thousandth of doping, the results of the chemical components (the chemical compositions of calcium, magnesium, iron, aluminum and silicon) and the loss on ignition are not changed, which shows that the chemical compositions in the cement are not influenced after the chromium removing agent is added.
Carrying out standard consistency, setting time and stability experiments on the cement sample doped with the chromium removing agent:
for the same cement samples, the chromium removing agent prepared in example 1 and doped with one thousandth of the cement mass, and the chromium removing agent prepared in example 1 and doped with five ten thousandth of the cement mass were not added, and the obtained 3 samples were subjected to the standard consistency, setting time, and stability tests, and the results are shown in table 4.
Table 4 shows the physical property tests of cement samples not doped with chromium remover and doped with chromium remover in different amounts
| Without addition of chromium removing agent | One in a thousand | Five parts per million | |
| Water consumption for standard consistency | 23.8％ | 24.0％ | 24.0％ |
| Initial setting time | 78min | 92min | 86min |
| Final setting time | 123min | 134min | 128min |
| Stability (Leishi clamp) | 2.0mm | 1.2mm | 1.2mm |
The experimental results are as follows: through the comparison of the standard consistency, the setting time and the stability of the sample without adding the chromium removing agent, the one thousandth doped chromium removing agent and the one ten thousandth doped chromium removing agent, the standard consistency, the setting time and the stability of the sample without adding the chromium removing agent and the sample without adding the chromium removing agent do not change greatly and meet the requirements of national standards.
According to the chromium removing agent provided by the invention, ferrous sulfate heptahydrate is easy to oxidize in the air and loses reduction activity, the chromium removing agent contains thiourea dioxide and manganese sulfate in a certain proportion, the two substances are hardly influenced by oxygen, particularly the thiourea dioxide is dissolved in 225 ml of water according to GB31893-2015 Limit and determination method for Water solubility (VI) in cement of 450 g of cement, the filtrate obtained by suction filtration is a strong alkaline solution with the pH of 12-13, the alkalinity can enable easy decomposition to produce sulfinic acid with strong reducibility, and the sulfinic acid reduces hexavalent chromium to trivalent chromium.
Comparative example 1
A composite powdery chromium removing agent comprises the following components in percentage by mass:
58.6 percent of sodium chloride, 31.5 percent of thiourea dioxide, 9 percent of manganese sulfate and 0.9 percent of ascorbic acid.
In the experimental process, under the condition of the same amount of antioxidant, the proportion of ferrous sulfate heptahydrate is removed, sodium chloride without reducibility is replaced, the proportion of thiourea dioxide and manganese sulfate is unchanged (the formula of the chromium removing agent is shown in a comparative example 1), 12.5mg/kg of hexavalent chromium can still be reduced into trivalent chromium, and the result is shown in table 5, which shows that the addition of thiourea dioxide can enhance the chromium removing efficiency of the chromium removing agent.
Table 5 shows the effect of the chromium removal agent component without the ferrous sulfate heptahydrate component on the hexavalent chromium content of the clinker
| Hexavalent chromium content | |
| Cement (without chromium remover) | 12.5mg/kg |
| Cement (one-thousandth chromium remover without ferrous sulfate) | Not detected out |
| Cement (five-ten-thousandth dechroming agent without ferrous sulfate) | Not detected out |
The invention inspects the synergistic effect of the raw materials and carries out the following comparative experiment:
comparative example 2
A composite powdery chromium removing agent comprises the following components in percentage by mass: 91% of sodium sulfate and 9% of manganese sulfate.
Comparative example 3
A composite powdery chromium removing agent comprises the following components in percentage by mass: 31.5 percent of thiourea dioxide and 68.5 percent of manganese sulfate.
Comparative example 4
A composite powdery chromium removing agent comprises the following components in percentage by mass: 58.6 percent of ferrous sulfate heptahydrate and 41.4 percent of sodium sulfate.
Since sodium sulfate has neither reducing nor oxidizing properties, in order to examine the chromium removing effect of each component in the chromium removing agent, according to the single variable principle, one chromium removing component in the chromium removing agent of example 1 was retained, and the other components were replaced with sodium sulfate (as in the chromium removing agents of comparative examples 2 to 4), and the chromium removing effect of the different chromium removing components and the synergistic chromium removing effect of each component in the chromium removing agent were examined, respectively, and the results are shown in table 6.
Table 6 shows the effect of the chromium removal of the different components of the chromium remover in combination with the synergistic effect of the components of the chromium remover
From the experimental data, under the condition of lower content of the chromium removing agent, the effect of simultaneously adding each chromium removing component is better than that of independently adding each chromium removing component, and the addition of manganese sulfate and thiourea dioxide can improve the reduction capability of a ferrous sulfate reduction system and has a synergistic effect.
Claims (7)
1. The composite powdery chromium remover is characterized by comprising the following components in percentage by mass:
30-60% of reducing agent, 20-50% of thiourea dioxide, 5-30% of manganese sulfate and 0.1-5% of antioxidant.
2. The composite powdery chromium remover according to claim 1, wherein said reducing agent is ferrous sulfate heptahydrate.
3. The composite powdery chromium remover according to claim 1 or 2, wherein said antioxidant is ascorbic acid.
4. The composite powdery chromium remover according to claim 1, wherein the composite powdery chromium remover comprises the following components in percentage by mass:
58.6% of ferrous sulfate heptahydrate, 31.5% of thiourea dioxide, 9% of manganese sulfate and 0.9% of ascorbic acid.
5. The preparation method of the composite powdery chromium remover as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps: and (3) uniformly mixing and stirring the reducing agent, the thiourea dioxide, the manganese sulfate and the antioxidant according to the formula ratio.
6. The use of the composite powdery chromium remover as claimed in any one of claims 1 to 4, which is used for removing chromium from cement.
7. The application of the composite powdery chromium remover as claimed in claim 6, wherein the composite powdery chromium remover is used for removing chromium from cement, and the dosage of the composite powdery chromium remover is 0.05-0.1% of the mass of the cement.
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2021
- 2021-11-25 CN CN202111412460.1A patent/CN113998912A/en active Pending
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