CN106365479A - Cement hexavalent chromium compounded reducing agent and preparation method thereof - Google Patents
Cement hexavalent chromium compounded reducing agent and preparation method thereof Download PDFInfo
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- CN106365479A CN106365479A CN201610707239.1A CN201610707239A CN106365479A CN 106365479 A CN106365479 A CN 106365479A CN 201610707239 A CN201610707239 A CN 201610707239A CN 106365479 A CN106365479 A CN 106365479A
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- cement
- reducing agent
- sulfate
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- hexavalent chromium
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- 239000004568 cement Substances 0.000 title claims abstract description 64
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims description 6
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 title abstract description 9
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims abstract description 22
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 20
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 20
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 20
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 20
- 235000010265 sodium sulphite Nutrition 0.000 claims abstract description 11
- RCIVOBGSMSSVTR-UHFFFAOYSA-L stannous sulfate Chemical compound [SnH2+2].[O-]S([O-])(=O)=O RCIVOBGSMSSVTR-UHFFFAOYSA-L 0.000 claims abstract description 11
- 229910000375 tin(II) sulfate Inorganic materials 0.000 claims abstract description 11
- 229940099596 manganese sulfate Drugs 0.000 claims abstract description 10
- 235000007079 manganese sulphate Nutrition 0.000 claims abstract description 10
- 239000011702 manganese sulphate Substances 0.000 claims abstract description 10
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 10
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- 239000012467 final product Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 235000011149 sulphuric acid Nutrition 0.000 claims description 3
- 239000001117 sulphuric acid Substances 0.000 claims description 3
- 239000011651 chromium Substances 0.000 abstract description 40
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 17
- 229910052804 chromium Inorganic materials 0.000 abstract description 10
- 238000002474 experimental method Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 238000002386 leaching Methods 0.000 description 20
- 238000000034 method Methods 0.000 description 19
- 239000000047 product Substances 0.000 description 17
- 238000012360 testing method Methods 0.000 description 16
- 239000000463 material Substances 0.000 description 11
- 239000002253 acid Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 239000002910 solid waste Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000000227 grinding Methods 0.000 description 7
- 150000002500 ions Chemical class 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 231100000419 toxicity Toxicity 0.000 description 5
- 230000001988 toxicity Effects 0.000 description 5
- KSPIHGBHKVISFI-UHFFFAOYSA-N Diphenylcarbazide Chemical compound C=1C=CC=CC=1NNC(=O)NNC1=CC=CC=C1 KSPIHGBHKVISFI-UHFFFAOYSA-N 0.000 description 4
- 229910001448 ferrous ion Inorganic materials 0.000 description 4
- 239000010881 fly ash Substances 0.000 description 4
- 239000011396 hydraulic cement Substances 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 230000001418 larval effect Effects 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 238000002798 spectrophotometry method Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 3
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001845 chromium compounds Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 201000004624 Dermatitis Diseases 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 231100000749 chronicity Toxicity 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 230000009466 transformation Effects 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
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
- C04B7/42—Active ingredients added before, or during, the burning process
- C04B7/421—Inorganic materials
- C04B7/425—Acids or salts thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a cement hexavalent chromium compounded reducing agent. The reducing agent comprises, by mass, 15-20% of sodium sulfite, 60-70% of ferrous sulfate, 10-20% of manganese sulfate and 1-10% of stannous sulfate, and the sum of mass percentages of all above components is 100%. The cement hexavalent chromium compounded reducing agent has good chemical stability and can reduce water-soluble hexavalent chromium into trivalent chromium, the content of hexavalent chromium keeps 2 ppm for three months, the reducing agent can reduce the fineness of cement before the cement is milled, and also can substantially increase the 3 d strength and the 28 d strength of the cement, and the actual amount of the reducing agent is less than 1/10 of the use amount of ferrous sulfate. The reducing agent has the characteristics of high reduction rate, good selectivity, simplicity in experiment operation, cheap and easily available raw materials and very high application prospect.
Description
Technical field
The present invention relates to a kind of cement Cr VI compound type reducing agent and preparation method thereof.
Background technology
In nineteen fifty, people are in Europe just it has been found that the soluble chromium compound in Portland cement can produce to human body
Serious ill symptomses, people are referred to as cement dermatitises.Solubility six in bricklayer and concreter's Long Term Contact cement
Valency chromium, above-mentioned symptom will reveal.Strong carcinogenecity, dna fracture, a series of this description of genetoxic all point to same ring
Border heavy metal contaminants Cr VI.At present, in the production process of Portland clinker, chromium is inevitable in raw material
One of trace element.Generally portland cement chrome content is between 100ppm～300ppm.Oxidation in cement kiln and alkalescence
Condition can promote chromic formation, and traditional refractory products are applied also along with chromic generation.
Denmark's water soluble hexavalent chromium in nineteen eighty-three is to cement has been made to limit less than 2ppm.It is earliest to water-soluble in cement
The country that property Cr VI restricts.Subsequently, every country also limits to content of 6-valence Cr ions in cement and is made that corresponding regulation.
In domestic common portland cement, content of 6-valence Cr ions major part exceedes or exceeds well over 0.0002% at present, there are about in the data of statistics
In 80% cement, content of 6-valence Cr ions is between 0.0002%～0.0015%.
Because in cement, content of 6-valence Cr ions is exceeded and harm to the mankind and environment, therefore the Cr VI gesture processing in cement exists
Must go.Chromic toxicity is chromic 100 times, so cr in cement6+Control generally use chemical reducing agent method, will
Solubility cr (vi) is reduced to hypotoxicity cr (iii).Persistency because of existing reducing agent such as ferrous sulfate reduction of hexavalent chromium is that have
Serious problems, it is very sensitive to humidity and temperature, and after grinding and during cement storage, its reducing power is gradually lost
Lose.This is accomplished by the ferrous sulfate using larger dose, and so, expense will be higher than expected.Cement is typically all aobvious
Alkalescence, a lot of reducing agents are all to play reduction in acid condition, are easy in the basic conditions lose also
Originality, accordingly, it would be desirable to exploitation a kind of efficient, inexpensive and stably can be permanently effective reducing agent by sexavalence highly toxic in cement
Chromium is reduced to hypotoxic trivalent chromium.
Content of the invention
Purpose: for solving the deficiencies in the prior art, the present invention provides a kind of cement Cr VI compound type reducing agent, can be by
Water soluble hexavalent chromium is reduced into trivalent chromium, and content of 6-valence Cr ions can maintain and be up to 3 months under 2ppm level.
Technical scheme: for solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of cement Cr VI compound type reducing agent, its raw material consists of: sodium sulfite 15～20%, ferrous sulfate 60-
70%th, manganese sulfate 10～20%, stannous sulfate 1～10%, total amount 100%；Described percentage ratio is mass percent.
Preferably, described cement Cr VI compound type reducing agent, its raw material consists of: sodium sulfite 17%, sulphuric acid
Ferrous 65%, manganese sulfate 12%, stannous sulfate 6%, total amount 100%；Described percentage ratio is mass percent.
The preparation method of described cement Cr VI compound type reducing agent, the steps include:
1) according to formula proportion, first by sodium sulfite, manganese sulfate, stannous sulfate dispersion mixing uniformly, obtain mixture；
2) and then by ferrous sulfate classification repeatedly it is added in mixture, until mix homogeneously；
3) again after 150 mesh stainless steel sift impurity screenings, obtain final product cement Cr VI compound type reducing agent.
Beneficial effect: the cement Cr VI compound type reducing agent that the present invention provides, comprise ferrous ion, mn2+、sn2+And Asia
Sulfate ion.Manganese is with mn2+The most stable, reproducibility is strong, and resistance to air oxidation can keep long-term reproducibility, and Vr is high and not
The moisture absorption, the features such as can make up the ferrous ion reproducibility unstable easy moisture absorption.sn2+Very big with the reduction nagative potential of sulfite ion
And it is eθ=-0.93v can completely be reacted with Cr VI and generate soluble trivalent chromium oxide.And ferrous ion reproducibility is weak
A lot of and unstable reduction nagative potential is eθ=-0.56v.And sn2+By hexavalent chrome reduction for trivalent chromium after, trivalent chromium continue with
sn4+Reaction generates stable indissoluble thing cr in the basic conditions2[sn(oh)6]3, after so ensuring that Cr VI is reduced
It is not easy to again be oxidized, between each component, mutual synergism and Cr VI reaction, produce stable trivalent chromium；Compound
These ions of reducing agent each played oneself advantage so that the shortcoming of single ferrous ion made up so that
Cr VI in reducing agent more stable effectively reduction cement, and taking cost into account this compound type reducing agent more saves
About produce the cost of cement.Employ the formula proportion of novelty, optimize the composition of traditional reducing agent, to chromic also proper energy
Power is higher, and makes product also have stronger reducing power in the later stage.With cement additire and concrete admixture compatibility
Well；It is suitable for various grinding systems.Actual amount is less than the 1/10 of ferrous sulfate, reduces in manufacture of cement in hexavalent chrome reduction
On cost.Cement after new Cr VI compound type reducing agent is processed, even if touching the oxidation environments such as thermal source and moisture,
Its bin stability also exceeds well over the cement processing through ferrous sulfate.This technology is in cement Cr VI compound type reducing agent industry
Field holds a safe lead, and has filled up the blank of the sector.Have the advantage that
1) this product actual amount is less than the 1/10 of ferrous sulfate, reduces the one-tenth on hexavalent chrome reduction in manufacture of cement
This；
2) preferably, storage period was more than 6 months for chemical stability；After Cr VI compound type reducing agent is processed, high valence chrome
Content can maintain and be up to 3 months under 2ppm level；
3) reducing power is strong, can improve cement early strength and later strength.
Specific embodiment
With reference to example, the present invention is illustrated:
Sodium sulfite 15～20%, ferrous sulfate 60-70%, manganese sulfate 10～20%, stannous sulfate 1～10%, total amount
100%；Described percentage ratio is mass percent.
Embodiment 1: a kind of cement Cr VI compound type reducing agent, composition is as follows:
Sodium sulfite 15%, ferrous sulfate 70%, manganese sulfate 10%, stannous sulfate (STANNOUS SULPHATE CRYSTALLINE ()) 5%, total amount
100%；Described percentage ratio is mass percent.
The preparation method of cement Cr VI compound type reducing agent, step is: according to formula proportion first by sodium sulfite, sulphuric acid
Uniformly, in agitator, low rate mixing 30s obtains mixture for manganese, stannous sulfate dispersion mixing；Then ferrous sulfate is added several times
It is added in mixture: be firstly added 20% ferrous sulfate, low rate mixing 120s；Subsequently sequentially add 20% ferrous sulfate, at a slow speed
Stirring 120s；Add after finishing, more than low rate mixing 5min, until mix homogeneously；Again through 150 mesh stainless steel sift impurity screenings
Afterwards, obtain final product product 1.
Embodiment 2 is to embodiment 5:
The method that each constituent content by specifying in table 1 below repeats EXPERIMENTAL EXAMPLE 1, respectively obtains different component content
Cement Cr VI compound type reducing agent product 2 to product 5:
Table 1
| Component (%) | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| Sodium sulfite | 15 | 17 | 18 | 20 | 15 |
| Ferrous sulfate | 70 | 65 | 61 | 60 | 68 |
| Manganese sulfate | 10 | 12 | 20 | 15 | 10 |
| Stannous sulfate | 5 | 6 | 1 | 5 | 10 |
| Obtain | Product 1 | Product 2 | Product 3 | Product 4 | Product 5 |
The Cr VI compound type reducing agent product 1- product 5 that embodiment is obtained is in the little mill of φ 500 × 500 code test
Tested respectively, detailed process is as follows:
According to following material proportion mixing: mass fraction be 63% grog, mass fraction be 8%, mass fraction be
18% slag and the flyash that mass fraction is 11%, then mix outward 0.005% chromic acid thereto, obtain mixture
Material.
The embodiment of add that mass fraction is mixed material gross mass in the mixed material obtaining 0.05% obtains
Cr VI compound type reducing agent product, the cement after being processed after combined grinding 25min.
Carry out existing product ferrous sulfate contrast and blank experiment simultaneously, see comparative example 1 to comparative example 3.
According to " hj/t 299 solid waste Leaching leaching method-comb acid pin acid system " and " hj 557 solid waste leaching
Go out toxicity leaching method-horizontal vibration method " Leaching tests are carried out to the grog aquation sample of different larval instar；Press " gb 7467 water
Matter-chromic mensure " chromic concentration in diphenylcarbazide spectrophotometry leachate；Press " gb/t 17671
Test method for strength of hydraulic cement mortar (iso method) " test the comprcssive strength of hardening of cement examination body and according to " gb1345 cement fineness
The method of inspection " using 45um sieve sieve formula test fineness, as shown in table 2, table 2 is the embodiment of the present invention to result and comparative example obtains
Little mill experimental result.
Comparative example 1
The little mill of φ 500 × 500 code test is tested, detailed process is as follows:
According to following material proportion mixing: mass fraction be 63% grog, mass fraction be 8%, mass fraction be
18% slag and the flyash that mass fraction is 11%, obtain mixed material.Water after being processed after combined grinding 25min
Mud.
According to " hj/t 299 solid waste Leaching leaching method-comb acid pin acid system " and " hj 557 solid waste leaching
Go out toxicity leaching method-horizontal vibration method " Leaching tests are carried out to the grog aquation sample of different larval instar；Press " gb 7467 water
Matter-chromic mensure " chromic concentration in diphenylcarbazide spectrophotometry leachate；Press " gb/t 17671
Test method for strength of hydraulic cement mortar (iso method) " test the comprcssive strength of hardening of cement examination body and according to " gb1345 cement fineness
The method of inspection " using 45um sieve sieve formula test fineness, as shown in table 2, table 2 is the embodiment of the present invention to result and comparative example obtains
Little mill experimental result.
Comparative example 2
The little mill of φ 500 × 500 code test is tested, detailed process is as follows:
According to following material proportion mixing: mass fraction be 63% grog, mass fraction be 8%, mass fraction be
18% slag and the flyash that mass fraction is 11%, then mix outward 0.005% chromic acid thereto, obtain mixture
Material.Cement after being processed after combined grinding 25min.
According to " hj/t 299 solid waste Leaching leaching method-comb acid pin acid system " and " hj 557 solid waste leaching
Go out toxicity leaching method-horizontal vibration method " Leaching tests are carried out to the grog aquation sample of different larval instar；Press " gb 7467 water
Matter-chromic mensure " chromic concentration in diphenylcarbazide spectrophotometry leachate；Press " gb/t 17671
Test method for strength of hydraulic cement mortar (iso method) " test the comprcssive strength of hardening of cement examination body and according to " gb1345 cement fineness
The method of inspection " using 45um sieve sieve formula test fineness, as shown in table 2, table 2 is the embodiment of the present invention to result and comparative example obtains
Little mill experimental result.
Comparative example 3
The little mill of φ 500 × 500 code test is tested, detailed process is as follows:
According to following material proportion mixing: mass fraction be 63% grog, mass fraction be 8%, mass fraction be
18% slag and the flyash that mass fraction is 11%, then mix outward 0.005% chromic acid thereto, obtain mixture
Material.
The ferrous sulfate reducing agent of mass fraction for mixture gross mass 0.05% is added in the mixed material obtaining,
Cement after being processed after combined grinding 25min.
According to " hj/t 299 solid waste Leaching leaching method-comb acid pin acid system " and " hj 557 solid waste leaching
Go out toxicity leaching method-horizontal vibration method " Leaching tests are carried out to the grog aquation sample of different larval instar；Press " gb 7467 water
Matter-chromic mensure " chromic concentration in diphenylcarbazide spectrophotometry leachate；Press " gb/t 17671
Test method for strength of hydraulic cement mortar (iso method) " test the comprcssive strength of hardening of cement examination body and according to " gb1345 cement fineness
The method of inspection " using 45um sieve sieve formula test fineness, as shown in table 2, table 2 is the embodiment of the present invention to result and comparative example obtains
Little mill experimental result.
Table 2
As can be seen that the cement Cr VI compound type reducing agent that the present invention provides and prepares, have the advantage that mesh
Front China cement production enterprise also has significant component of cement products water soluble hexavalent chromium more than 10.00ppm, the cement six of the present invention
Valency chromium compound type reducing agent just can be reduced to below 2ppm chromic content under low dose of service condition, with
When can reduce cement fineness, 3 days and 28 days intensity of cement can also be dramatically increased.And this Cr VI compound type reducing agent
Preferably, storage period was more than 6 months for chemical stability.Experiment confirms that high valence chrome contains after compound type reducing agent of the present invention is processed
Amount can maintain and be up to 3 months under 2ppm level.Bin stability in each cement plant is all fine, is conducive to sexavalence in cement
The chronicity reduction of chromium.Good with cement additire and concrete admixture compatibility；It is suitable for various grinding systems；This product is real
Border consumption is less than the 1/10 of ferrous sulfate, reduces the cost on hexavalent chrome reduction in manufacture of cement.The method has reduction
Rate is high, selectivity is good, and the features such as experimental implementation is easy, and raw material is cheap and easy to get, has very high application prospect.
Below the present invention is disclosed with preferred embodiment, so it is not intended to limiting the invention, all employing equivalents
Or the technical scheme that equivalent transformation mode is obtained, is within the scope of the present invention.
Claims (3)
1. a kind of cement Cr VI compound type reducing agent, its raw material consists of: sodium sulfite 15～20%, ferrous sulfate 60-70%,
Manganese sulfate 10～20%, stannous sulfate 1～10%, total amount 100%；Described percentage ratio is mass percent.
2. cement Cr VI compound type reducing agent according to claim 1, its raw material consists of: sodium sulfite 17%, sulphuric acid
Ferrous 65%, manganese sulfate 12%, stannous sulfate 6%, total amount 100%；Described percentage ratio is mass percent.
3. the preparation method of cement Cr VI compound type reducing agent according to claim 1 and 2, the steps include:
1) according to formula proportion, first by sodium sulfite, manganese sulfate, stannous sulfate dispersion mixing uniformly, obtain mixture；
2) and then by ferrous sulfate classification repeatedly it is added in mixture, until mix homogeneously；
3) again after 150 mesh stainless steel sift impurity screenings, obtain final product cement Cr VI compound type reducing agent.
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| CN106830725A (en) * | 2017-02-21 | 2017-06-13 | 辽宁天宝华瑞建材有限公司 | Cement Cr VI cuts down agent |
| CN111087189A (en) * | 2019-12-31 | 2020-05-01 | 中国葛洲坝集团水泥有限公司 | Hexavalent chromium reducing agent and preparation method thereof |
| CN111344263A (en) * | 2017-11-10 | 2020-06-26 | 赵炳学 | Cement additive and its production method |
| CN111511701A (en) * | 2017-12-22 | 2020-08-07 | 法商圣高拜欧洲实验及研究中心 | Glass melting furnace comprising a product containing chromium oxide having a valence of 3 |
| CN111517687A (en) * | 2020-06-15 | 2020-08-11 | 安徽海螺新材料科技有限公司 | Chromium-reducing cement grinding aid and preparation method thereof |
| CN112645628A (en) * | 2020-09-10 | 2021-04-13 | 唐山盾石干粉建材有限责任公司 | Formula and preparation process of novel powder cement grinding aid |
| CN113264708A (en) * | 2021-06-24 | 2021-08-17 | 邢台建德水泥有限公司 | Hexavalent chromium reducing agent for high-reducibility cement and preparation method thereof |
| CN113307528A (en) * | 2021-06-02 | 2021-08-27 | 龙蟒佰利联集团股份有限公司 | Chromium reducing agent for cement and preparation and use methods thereof |
| CN113912317A (en) * | 2021-11-12 | 2022-01-11 | 湖南先锋防水科技有限公司 | Cement production method by adding naphthalene sulfonate water reducing agent |
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| CN106830725B (en) * | 2017-02-21 | 2020-12-11 | 辽宁天宝华瑞建材有限公司 | Hexavalent chromium reducing agent for cement |
| CN106830725A (en) * | 2017-02-21 | 2017-06-13 | 辽宁天宝华瑞建材有限公司 | Cement Cr VI cuts down agent |
| CN111344263A (en) * | 2017-11-10 | 2020-06-26 | 赵炳学 | Cement additive and its production method |
| CN111511701A (en) * | 2017-12-22 | 2020-08-07 | 法商圣高拜欧洲实验及研究中心 | Glass melting furnace comprising a product containing chromium oxide having a valence of 3 |
| CN111511701B (en) * | 2017-12-22 | 2024-03-15 | 法商圣高拜欧洲实验及研究中心 | Glass melting furnace comprising a product containing chromium oxide 3 |
| CN111087189A (en) * | 2019-12-31 | 2020-05-01 | 中国葛洲坝集团水泥有限公司 | Hexavalent chromium reducing agent and preparation method thereof |
| CN111517687B (en) * | 2020-06-15 | 2022-03-11 | 安徽海螺新材料科技有限公司 | Chromium-reducing cement grinding aid and preparation method thereof |
| CN111517687A (en) * | 2020-06-15 | 2020-08-11 | 安徽海螺新材料科技有限公司 | Chromium-reducing cement grinding aid and preparation method thereof |
| CN112645628A (en) * | 2020-09-10 | 2021-04-13 | 唐山盾石干粉建材有限责任公司 | Formula and preparation process of novel powder cement grinding aid |
| CN113307528A (en) * | 2021-06-02 | 2021-08-27 | 龙蟒佰利联集团股份有限公司 | Chromium reducing agent for cement and preparation and use methods thereof |
| CN113264708A (en) * | 2021-06-24 | 2021-08-17 | 邢台建德水泥有限公司 | Hexavalent chromium reducing agent for high-reducibility cement and preparation method thereof |
| CN113912317A (en) * | 2021-11-12 | 2022-01-11 | 湖南先锋防水科技有限公司 | Cement production method by adding naphthalene sulfonate water reducing agent |
| CN113998912A (en) * | 2021-11-25 | 2022-02-01 | 安徽精公检测检验中心有限公司 | Composite powdery chromium removal agent and preparation method and application thereof |
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