CN113480219A - Chromium reducing agent for reducing water-soluble chromium (VI) in cement and preparation method thereof - Google Patents
Chromium reducing agent for reducing water-soluble chromium (VI) in cement and preparation method thereof Download PDFInfo
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- CN113480219A CN113480219A CN202110800152.XA CN202110800152A CN113480219A CN 113480219 A CN113480219 A CN 113480219A CN 202110800152 A CN202110800152 A CN 202110800152A CN 113480219 A CN113480219 A CN 113480219A
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- 239000004568 cement Substances 0.000 title claims abstract description 119
- 239000011651 chromium Substances 0.000 title claims abstract description 113
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 108
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 106
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 106
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 64
- 239000003381 stabilizer Substances 0.000 claims abstract description 41
- 239000003054 catalyst Substances 0.000 claims abstract description 31
- 239000002994 raw material Substances 0.000 claims abstract description 12
- DLRVVLDZNNYCBX-UHFFFAOYSA-N Polydextrose Polymers OC1C(O)C(O)C(CO)OC1OCC1C(O)C(O)C(O)C(O)O1 DLRVVLDZNNYCBX-UHFFFAOYSA-N 0.000 claims description 40
- 238000002156 mixing Methods 0.000 claims description 32
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 29
- 239000002270 dispersing agent Substances 0.000 claims description 26
- 239000011812 mixed powder Substances 0.000 claims description 26
- 239000011790 ferrous sulphate Substances 0.000 claims description 23
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 23
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 23
- 229920001100 Polydextrose Polymers 0.000 claims description 20
- 239000001259 polydextrose Substances 0.000 claims description 20
- 229940035035 polydextrose Drugs 0.000 claims description 20
- 235000013856 polydextrose Nutrition 0.000 claims description 20
- ZNCPFRVNHGOPAG-UHFFFAOYSA-L sodium oxalate Chemical compound [Na+].[Na+].[O-]C(=O)C([O-])=O ZNCPFRVNHGOPAG-UHFFFAOYSA-L 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 20
- 229940039790 sodium oxalate Drugs 0.000 claims description 19
- 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 18
- 239000011640 ferrous citrate Substances 0.000 claims description 17
- 235000019850 ferrous citrate Nutrition 0.000 claims description 17
- APVZWAOKZPNDNR-UHFFFAOYSA-L iron(ii) citrate Chemical compound [Fe+2].OC(=O)CC(O)(C([O-])=O)CC([O-])=O APVZWAOKZPNDNR-UHFFFAOYSA-L 0.000 claims description 17
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims description 16
- 229940044172 calcium formate Drugs 0.000 claims description 16
- 235000019255 calcium formate Nutrition 0.000 claims description 16
- 239000004281 calcium formate Substances 0.000 claims description 16
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 15
- 235000011152 sodium sulphate Nutrition 0.000 claims description 15
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 15
- 239000010881 fly ash Substances 0.000 claims description 13
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 claims description 13
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 claims description 12
- 229940101006 anhydrous sodium sulfite Drugs 0.000 claims description 12
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 12
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 12
- 235000010323 ascorbic acid Nutrition 0.000 claims description 9
- 229960005070 ascorbic acid Drugs 0.000 claims description 9
- 239000011668 ascorbic acid Substances 0.000 claims description 9
- 239000008103 glucose Substances 0.000 claims description 9
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 8
- 239000011575 calcium Substances 0.000 claims description 8
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 6
- 239000012876 carrier material Substances 0.000 claims description 4
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 claims description 3
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims 2
- 229960001031 glucose Drugs 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 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 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 24
- 238000000034 method Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 239000002956 ash Substances 0.000 description 8
- 238000000227 grinding Methods 0.000 description 8
- 239000000654 additive Substances 0.000 description 7
- 230000000996 additive effect Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 5
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 5
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 239000000600 sorbitol Substances 0.000 description 5
- 235000019738 Limestone Nutrition 0.000 description 4
- 241000276489 Merlangius merlangus Species 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 239000000706 filtrate Substances 0.000 description 4
- 239000006028 limestone Substances 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 3
- -1 marl Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- WURBFLDFSFBTLW-UHFFFAOYSA-N benzil Chemical group C=1C=CC=CC=1C(=O)C(=O)C1=CC=CC=C1 WURBFLDFSFBTLW-UHFFFAOYSA-N 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 206010029240 Neuritis Diseases 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 208000007502 anemia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 210000000170 cell membrane Anatomy 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 210000001035 gastrointestinal tract Anatomy 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 210000004400 mucous membrane Anatomy 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004153 renaturation Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000003245 working effect 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of environmental protection, and discloses a chromium reducing agent for reducing water-soluble chromium (VI) in cement and a preparation method thereof, wherein the chromium reducing agent comprises the following preparation raw materials: chromium reducing agent, stabilizer, catalyst and dispersing carrier. The high-efficiency high-performance powder chromium reducing agent can effectively control the content of water-soluble hexavalent chromium of the cement and completely meet the requirements specified by the national standards of cement, and because the high-efficiency chelating stabilizer new technology is adopted, the reduced water-soluble Cr6+The powder chromium-reducing agent can not return to recovery, the preparation method is simple and easy to operate and implement, the doping rate of the high-performance high-efficiency powder chromium-reducing agent is far lower than the maximum dosage specified by T/CCAS009-2019, and the preparation method is simple and easy to operate and implement.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a chromium reducing agent for reducing water-soluble chromium (VI) in cement and a preparation method thereof.
Background
The exceeding of the water-soluble hexavalent chromium content can harm human health, has strong toxicity and strong oxidation effect, can permeate cell membranes, and seriously damages the digestive tract, the respiratory tract, the skin and the mucous membrane of a human body. The body can irritate skin and even ulcerate if contacted with hexavalent chromium, and the consumption of water containing hexavalent chromium can cause anemia, neuritis, and the intake of hexavalent chromium can cause cancer, mutation and other adverse effects. The cement contains water-soluble hexavalent chromium which is a harmful trace element, so the water-soluble hexavalent chromium in the cement needs to be reduced and removed, and the content of the water-soluble hexavalent chromium is reduced to be below a certain limit value.
The water-soluble hexavalent chromium in the cement mainly comes from the following four aspects: the cement is prepared from cement raw materials such as marl, limestone, clay, iron ore and the like; second, from chromium containing crushing and attrition of the grinding media; thirdly, chromium is oxidized at a high-temperature zone and an outlet of the cement kiln due to conditions of high air pressure, high-alkalinity furnace burden and the like; fourthly, the method utilizes chromium-containing waste as alternative fuel and raw material in cement production.
In order to reduce the water-soluble hexavalent chromium in the cement to meet the requirement of not more than 10mg/kg specified in GB31893-2015 Limit and determination method for water-soluble chromium (VI) in the cement and strictly execute the standard specification of T/CCAS009-2019 Reductant for water-soluble chromium (VI) in the cement, the method can be realized by adding a proper amount of high-efficiency high-performance powder chromium-reducing agent into the cement. The concrete doping rate of the cement chromium reducing agent in the cement can be determined according to the actual background value of the water-soluble hexavalent chromium of the cement, and the research focus of the invention is that the doping rate of the cement chromium reducing agent can be reduced.
The chromium reducing agent products in the market used by cement enterprises exist in the market, the milled cement using the chromium reducing agent initially has an obvious chromium reduction effect, the chromium reduction rate is high, but trivalent chromium in the cement can be further oxidized into hexavalent chromium along with the prolonging of the storage time of the cement, so that the content of the water-soluble hexavalent chromium continuously exceeds a standard limit value, a certain renaturation is shown, and certain quality risk and brand influence of the factory-leaving products also exist.
According to the principles of reducibility, stability and economy of the chromium removing agent for cement, through experimental research on the reducing capability and stability of the chromium removing agent for cement, the chromium removing agent for cement is developed and developed to meet the requirements specified in GB31893-2015 Limit and determination method for water-soluble chromium (VI) in cement, and has water-soluble Cr after reduction6+Will not return to recoveryThe high-performance high-efficiency powder chromium reducing agent has obvious significance.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide the chromium reducing agent for reducing the water-soluble chromium (VI) in the cement and the preparation method thereof, the high-efficiency high-performance powder chromium reducing agent can effectively control the content of the water-soluble hexavalent chromium of the cement and completely meet the requirements specified by the national standards of the cement, and because the high-efficiency chelating stabilizer new technology is adopted, the reduced water-soluble Cr (VI) can be used as the chromium reducing agent6+The powder chromium-reducing agent can not return to recovery, the preparation method is simple and easy to operate and implement, the doping rate of the high-performance high-efficiency powder chromium-reducing agent is far lower than the maximum dosage specified by T/CCAS009-2019, and the preparation method is simple and easy to operate and implement.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
The chromium reducing agent for reducing the water-soluble chromium (VI) in the cement comprises the following preparation raw materials: chromium reducing agent, stabilizer, catalyst and dispersing carrier.
Preferably, the chromium reducing agent is one or more of sodium thiosulfate, ferrous sulfate, ferrous citrate and anhydrous sodium sulfite.
Further preferably, the sodium thiosulfate is anhydrous sodium thiosulfate and is white powder, and the content of the sodium thiosulfate is more than or equal to 95%.
Further preferably, the ferrous sulfate is granular ferrous sulfate heptahydrate, and the granularity is less than or equal to 0.5 mm; or water-containing wet powdery ferrous sulfate heptahydrate, the water content is less than or equal to 10 percent; or powdery white anhydrous ferrous sulfate with the content more than or equal to 96 percent.
Preferably, the ferrous citrate is food-grade and is in the form of grayish green powder, the ferrous content is more than or equal to 22.0 percent, the ferric content is less than or equal to 3.0 percent, and the sulfate is less than or equal to 0.06 percent.
Further preferably, the anhydrous sodium sulfite is white crystalline powder, and the content of the anhydrous sodium sulfite is more than or equal to 85 percent, the water content is less than or equal to 1.0 percent, and the ash content of sulfuric acid is less than or equal to 0.05 percent.
Preferably, the stabilizer is ascorbic acid VCAmmonia IIIOne or more of acetic acid, (oligo) polydextrose, sodium oxalate, disodium ethylenediaminetetraacetate (EDTA-2 Na).
Further preferably, the ascorbic acid VCIs an industrial grade, and the effective content of the crystalline white powder is more than or equal to 99 percent.
Further preferably, the sodium oxalate is in industrial grade, and the content is more than or equal to 99.0%.
Further preferably, the nitrilotriacetic acid and EDTA-2Na are analytically pure reagents.
Preferably, the pH value of the EDTA-2Na is 4.0-5.0, and the content is more than or equal to 99.0%.
Further preferably, the (low) polydextrose is a food-grade additive, the content of polydextrose is more than or equal to 90.0%, the pH value is 2.5-7.0, the ash content is less than or equal to 0.3%, and the content of glucose and sorbitol is less than or equal to 6.0%.
Preferably, the catalyst is one or two of anhydrous sodium sulphate and calcium formate.
Further preferably, the anhydrous sodium sulphate is in industrial grade, the content is more than or equal to 99 percent, and the content of water-insoluble substances is less than or equal to 0.03 percent.
Further preferably, the calcium formate is industrial grade, light brown crystalline powder, and the content of the calcium formate is more than or equal to 99%.
Preferably, the dispersion carrier is one or two of fly ash and heavy calcium carbonate powder.
Further preferably, the fly ash is secondary fly ash, and the specific surface area is 320-400m2The burning vector is less than or equal to 5.0 percent per kg.
Preferably, the heavy calcium powder is crushed limestone or commercial industrial heavy calcium, 325 meshes, the content of calcium oxide is more than or equal to 48 percent, the content of magnesium oxide is less than or equal to 6.0 percent, the content of water is less than or equal to 1.0 percent, and the specific surface area is 350 +/-15 m2/kg。
Further preferably, the raw materials are used in the following amounts: 30.0-60.0% of chromium reducing agent, 2.0-20.0% of stabilizer, 2.0-15.0% of catalyst and 10.0-40.0% of dispersing carrier.
Further preferably, the chromium reducing agent comprises: 0-30.0% of sodium thiosulfate, 0-40.0% of ferrous sulfate, 0-10.0% of ferrous citrate and 0-10.0% of anhydrous sodium sulfite, which account for the mass percentage of the chromium reducing agent.
Further preferably, the stabilizer comprises: ascorbic acid VC0-5.0% of nitrilotriacetic acid, 0-10.0% of (low) polydextrose, 0-6.0% of sodium oxalate and 0-8.0% of EDTA-2Na, which are the mass percentages of the chromium reducing agent.
Further preferably, the catalyst comprises: 0-6% of anhydrous sodium sulphate and 0-10.0% of calcium formate, which account for the mass percentage of the chromium reducing agent.
(II) a preparation method of a chromium reducing agent for reducing water-soluble chromium (VI) in cement, which comprises the following steps:
step 1, preparing a dispersant carrier material for later use;
step 2, adding a chromium reducing agent into the dispersant carrier material, and uniformly mixing and stirring to obtain mixed powder;
step 3, respectively preparing a stabilizer and a catalyst for later use;
and 4, sequentially adding the stabilizer and the catalyst into the mixed powder, and uniformly mixing and stirring to obtain the catalyst.
Compared with the prior art, the invention has the beneficial effects that:
1) the high-performance high-efficiency powder chromium-reducing agent is composed of various chromium reducing agents, chelating stabilizers, catalysts, dispersing agents and the like, does not influence the mechanical properties such as cement setting time, volume stability, strength and the like, does not influence the rheological working performance of cement, the durability of cement and the like, is specially used for reducing water-soluble Cr in cement6+Green environmental protection type cement process additive.
2) The high-performance high-efficiency powder chromium reducing agent has the characteristics of high chromium reducing efficiency, stable performance, good blanking fluidity and the like; the high-performance high-efficiency powder chromium remover can effectively control the water-soluble Cr of the water6+The content can completely meet the requirements of national standards of cement, a new technology of high-efficiency chelating stabilizer is adopted, and the reduced water-soluble Cr6+And will not return to recovery.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
Example 1
A chromium reducing agent for reducing water-soluble chromium (VI) in cement comprises the following raw materials in percentage by mass: 70% of chromium reducing agent, 10% of stabilizing agent, 2.2% of catalyst and 17.8% of dispersing agent. Wherein, the chromium reducing agent is 30 percent of sodium thiosulfate, 20 percent of ferrous sulfate and 20 percent of anhydrous sodium sulfite; the stabilizer is nitrilotriacetic acid 5%, sodium oxalate 3%, EDTA-2Na 2%, and the catalyst is sodium sulfate 2.2%; the dispersant is coarse whiting powder 17.8%.
Wherein the sodium thiosulfate is anhydrous sodium thiosulfate and is white powder, and the content is more than or equal to 95 percent. The ferrous sulfate is ferrous sulfate heptahydrate, is green granular, has a particle size of less than or equal to 0.5mm, a content of more than or equal to 96 percent and a water content of less than or equal to 1.0 percent. The anhydrous sodium sulfite is white crystal powder, and is industrial grade, the content is more than or equal to 85 percent, the water content is less than or equal to 1.0 percent, and the ash content of the sulfuric acid is less than or equal to 0.05 percent. Nitrilotriacetic acid and EDTA-2Na are analytically pure reagents. The pH value of EDTA-2Na is 4.0-5.0, and the content is more than or equal to 99.0%. The sodium oxalate is industrial grade, and the content is more than or equal to 99.0 percent. The anhydrous sodium sulphate is in the industrial grade, is white powder, has the content of more than or equal to 99 percent, and has the water insoluble substance of less than or equal to 0.03 percent. The dispersant is coarse whiting powder which is commercial industrial coarse whiting powder with 325 meshes, the content of calcium oxide is more than or equal to 48 percent, and the content of magnesium oxide is less than or equal to 6.0 percent.
The preparation method of the chromium reducing agent for reducing the water-soluble chromium (VI) in the cement comprises the following steps:
step 1, sequentially and respectively adding sodium thiosulfate, ferrous sulfate and anhydrous sodium sulfite in a chromium reducing agent into the dispersant heavy calcium powder according to the determined proportion, and fully mixing and stirring uniformly to obtain first mixed powder.
And 2, sequentially adding and mixing nitrilotriacetic acid, sodium oxalate, EDTA-2Na and the like according to a proportion, and fully mixing and stirring uniformly to obtain the stabilizer mixed powder.
And 3, sequentially adding the stabilizer mixed powder and the anhydrous sodium sulphate in a determined proportion into the first mixed powder, and fully mixing and stirring uniformly to obtain the high-performance high-efficiency powder chromium-reducing agent JGF1# for reducing water-soluble chromium (VI) in cement.
Example 2
A chromium reducing agent for reducing water-soluble chromium (VI) in cement comprises the following raw materials in percentage by mass: 50% of chromium reducing agent, 15% of stabilizing agent, 4% of catalyst and 31% of dispersing agent. Wherein, the chromium reducing agent is 40 percent of ferrous sulfate and 10 percent of ferrous citrate; stabilizer is 8% of nitrilotriacetic acid, 5% of sodium oxalate and 2% of (low) polydextrose, and catalyst is 4.0% of anhydrous sodium sulphate; the dispersant is 30.0 percent of second-grade fly ash.
Wherein the ferrous sulfate is ferrous sulfate heptahydrate, is green granular, has a particle size of less than or equal to 0.5mm, a content of more than or equal to 96 percent and a water content of less than or equal to 1.0 percent. The ferrous citrate is food-grade and is in the form of light grey green powder, the ferrous content is more than or equal to 22.0 percent, the ferric content is less than or equal to 3.0 percent, and the sulfate is less than or equal to 0.06 percent. Nitrilotriacetic acid is an analytically pure reagent. The sodium oxalate is industrial grade, and the content is more than or equal to 99.0 percent. (low) polydextrose is a food-grade additive, the content of polydextrose is more than or equal to 90.0 percent, the pH value is 2.5-7.0, the ash content is less than or equal to 0.3 percent, and the content of glucose and sorbitol is less than or equal to 6.0 percent. The catalyst is anhydrous sodium sulphate, is in an industrial grade, is white powder, has the content of more than or equal to 99 percent, and has the water insoluble substance of less than or equal to 0.03 percent. The dispersant is secondary fly ash with the specific surface area of 320-400m2The burning vector is less than or equal to 5.0 percent per kg.
The preparation method of the chromium reducing agent for reducing the water-soluble chromium (VI) in the cement comprises the following steps:
step 1, sequentially and respectively adding ferrous sulfate and ferrous citrate in a chromium reducing agent into the dispersant secondary fly ash according to the determined proportion, and fully mixing and stirring uniformly to obtain first mixed powder.
And 2, sequentially mixing and blending nitrilotriacetic acid, sodium oxalate, low-glucose polymer and the like according to a ratio, and fully mixing and stirring uniformly to obtain the stabilizer mixed powder.
And 3, sequentially adding the stabilizer mixed powder and the anhydrous sodium sulphate in a determined proportion into the first mixed powder, and fully mixing and stirring uniformly to obtain the chromium reducing agent JGF2# for reducing the water-soluble chromium (VI) in the cement.
Example 3
A chromium reducing agent for reducing water-soluble chromium (VI) in cement comprises the following raw materials in percentage by mass: 60% of chromium reducing agent, 10% of stabilizer, 5% of catalyst and 25% of dispersant. Wherein, the chromium reducing agent is 20 percent of sodium thiosulfate, 30 percent of ferrous sulfate and 10 percent of ferrous citrate; the stabilizer is ascorbic acid VC2%, sodium oxalate 4% and (low) polydextrose 4%; the catalyst is 5.0 percent of calcium formate; the dispersant is 25 percent of secondary fly ash.
Wherein the sodium thiosulfate is anhydrous sodium thiosulfate and is white powder, and the content is more than or equal to 95 percent. The ferrous sulfate is industrial heptahydrate ferrous sulfate, is in a green moisture-containing powdery shape, the content is more than or equal to 96 percent, and the water content is less than or equal to 10.0 percent. The ferrous citrate is food-grade and is in the form of light grey green powder, the ferrous content is more than or equal to 22.0 percent, the ferric content is less than or equal to 3.0 percent, and the sulfate is less than or equal to 0.06 percent. Ascorbic acid VCIs an industrial grade, and the effective content of the crystalline white powder is more than or equal to 99 percent. The sodium oxalate is industrial grade, and the content is more than or equal to 99.0 percent. (low) polydextrose is a food-grade additive, the content of polydextrose is more than or equal to 90.0 percent, the pH value is 2.5-7.0, the ash content is less than or equal to 0.3 percent, and the content of glucose and sorbitol is less than or equal to 6.0 percent. The catalyst is industrial calcium formate, light brown crystalline powder with content not less than 99% and water insoluble matter not more than 0.03%. The dispersant is secondary fly ash with the specific surface area of 320-400m2The burning vector is less than or equal to 5.0 percent per kg.
The preparation method of the chromium reducing agent for reducing the water-soluble chromium (VI) in the cement comprises the following steps:
step 1, sequentially and respectively adding sodium thiosulfate, ferrous sulfate and ferrous citrate in a chromium reducing agent into the dispersant secondary fly ash according to the determined proportion, and fully mixing and stirring uniformly to obtain first mixed powder.
Step 2, adding ascorbic acid VCSodium oxalate and (low) polydextrose are mixed and prepared according to the proportion in turn, and then are fully mixed and stirred uniformly to obtain the stabilizer mixed powder.
And 3, sequentially adding the stabilizer mixed powder and the calcium formate in a determined proportion into the first mixed powder, and fully mixing and stirring uniformly to obtain the chromium reducing agent JGF3# for reducing the water-soluble chromium (VI) in the cement.
Example 4
A chromium reducing agent for reducing water-soluble chromium (VI) in cement comprises the following raw materials in percentage by mass: 50% of chromium reducing agent, 12% of stabilizer, 6% of catalyst and 32% of dispersant. Wherein, the chromium reducing agent is 35 percent of ferrous sulfate and 15 percent of ferrous citrate; the stabilizer is 3 percent of sodium oxalate, 5 percent of (low) polydextrose and 4 percent of EDTA-2 Na; the catalyst is calcium formate 6%; the dispersant is 32 percent of coarse whiting powder.
Wherein the ferrous sulfate is ferrous sulfate heptahydrate, is green granular, has a particle size of less than or equal to 0.5mm, a content of more than or equal to 96 percent and a water content of less than or equal to 1.0 percent. The ferrous citrate is food-grade and is in the form of light grey green powder, the ferrous content is more than or equal to 22.0 percent, the ferric content is less than or equal to 3.0 percent, and the sulfate is less than or equal to 0.06 percent. Ascorbic acid VCIs an industrial grade, and the effective content of the crystalline white powder is more than or equal to 99 percent. The sodium oxalate is industrial grade, and the content is more than or equal to 99.0 percent. (low) polydextrose is a food-grade additive, the content of polydextrose is more than or equal to 90.0 percent, the pH value is 2.5-7.0, the ash content is less than or equal to 0.3 percent, and the content of glucose and sorbitol is less than or equal to 6.0 percent. The pH value of EDTA-2Na is 4.0-5.0, and the content is more than or equal to 99.0%. The catalyst is industrial calcium formate, light brown crystalline powder with content not less than 99% and water insoluble matter not more than 0.03%. The dispersing agent is prepared by crushing, drying and grinding blocky limestone until the water content is less than or equal to 1.0 percent and the specific surface area is 350 +/-15 m2The content of calcium oxide in the powdery heavy calcium powder is more than or equal to 48 percent and the content of magnesium oxide in the powdery heavy calcium powder is less than or equal to 6.0 percent.
The preparation method of the chromium reducing agent for reducing the water-soluble chromium (VI) in the cement comprises the following steps:
step 1, crushing, drying and grinding limestone until the moisture content is less than or equal to 1.0 percent and the specific surface area is 350 +/-15 m2The powder of the heavy calcium powder is used for mixing and preparing a cement chromium reducing agent powder sample.
And 2, sequentially and respectively adding ferrous sulfate and ferrous citrate in the chromium reducing agent into the dispersant heavy calcium powder according to the determined proportion, and fully mixing and uniformly stirring to obtain first mixed powder.
And 3, sequentially mixing and blending sodium oxalate, low-glucose polydextrose, EDTA-2Na and the like according to a ratio, fully mixing and stirring uniformly to obtain the stabilizer mixed powder.
And 4, sequentially adding the stabilizer mixed powder and the calcium formate in a determined proportion into the first mixed powder, and fully mixing and stirring uniformly to obtain the high-performance high-efficiency powder chromium reducing agent JGF4# for reducing the water-soluble chromium (VI) in the cement.
Example 5
A chromium reducing agent for reducing water-soluble chromium (VI) in cement comprises the following raw materials in percentage by mass: 50% of chromium reducing agent, 8% of stabilizing agent, 6% of catalyst and 36% of dispersing agent. Wherein, the chromium reducing agent is 30 percent of ferrous sulfate, 10 percent of ferrous citrate and 10 percent of anhydrous sodium sulfite; the stabilizer is 3 percent of nitrilotriacetic acid, 3 percent of sodium oxalate and 2 percent of (low) polydextrose; the catalyst is 3 percent of anhydrous sodium sulphate and 3.0 percent of calcium formate; the dispersant is 36 percent of second-grade fly ash.
Wherein the ferrous sulfate is industrial heptahydrate ferrous sulfate, is in a green moisture-containing powdery shape, the content is more than or equal to 96 percent, and the water content is less than or equal to 10.0 percent. The ferrous citrate is food-grade and is in the form of light grey green powder, the ferrous content is more than or equal to 22.0 percent, the ferric content is less than or equal to 3.0 percent, and the sulfate is less than or equal to 0.06 percent. The anhydrous sodium sulfite is white crystal powder, and is industrial grade, the content is more than or equal to 85 percent, the water content is less than or equal to 1.0 percent, and the ash content of the sulfuric acid is less than or equal to 0.05 percent. Nitrilotriacetic acid is an analytically pure reagent. The sodium oxalate is industrial grade, and the content is more than or equal to 99.0 percent. (low) polydextrose is a food-grade additive, the content of polydextrose is more than or equal to 90.0 percent, the pH value is 2.5-7.0, the ash content is less than or equal to 0.3 percent, and the content of glucose and sorbitol is less than or equal to 6.0 percent. The anhydrous sodium sulphate is of industrial grade, the content is more than or equal to 99 percent, and the content of water insoluble substances is less than or equal to 0.03 percent. The calcium formate is in the form of industrial grade, light brown crystalline powder with content more than or equal to 99%. The dispersant is secondary fly ash with the specific surface area of 320-400m2The burning vector is less than or equal to 5.0 percent per kg.
The preparation method of the chromium reducing agent for reducing the water-soluble chromium (VI) in the cement comprises the following steps:
step 1, sequentially and respectively adding ferrous sulfate, ferrous citrate and anhydrous sodium sulfite in a chromium reducing agent into the dispersant secondary fly ash according to the determined proportion, and fully mixing and stirring uniformly to obtain first mixed powder.
And 2, sequentially mixing and blending nitrilotriacetic acid, sodium oxalate, low-glucose polymer and the like according to a ratio, and fully mixing and stirring uniformly to obtain the stabilizer mixed powder.
And 3, blending and mixing anhydrous sodium sulphate and calcium formate according to a proportion, and fully mixing and stirring uniformly to obtain the catalyst mixed powder.
And 4, sequentially adding the stabilizer mixed powder and the catalyst mixed powder into the first mixed powder, and fully mixing and stirring uniformly to obtain the high-performance high-efficiency powder chromium reducer JGF5# for reducing the water-soluble chromium (VI) in the cement.
The chromium reducing agent for reducing the water-soluble chromium (VI) in the cement has the following specific effects:
the chromium reducing agent is added into the high-performance high-efficiency powder chromium reducing agent, so that the water-soluble hexavalent chromium in the cement can be reduced into trivalent chromium, and the content of the water-soluble hexavalent chromium in the cement is reduced.
The stabilizer is added into the high-performance high-efficiency powder chromium reducing agent, mainly adopts the chelation effect of the high-efficiency chelating stabilizer, can include metal ions into the chelating agent through the strong combination effect of chelating stabilizer molecules and metal ions, and becomes a stable compound with larger molecular weight, thereby preventing the metal ions from acting and being very stable and not easy to dissociate in water. Effectively reduces the water-soluble hexavalent chromium metal ions, leads the hexavalent chromium to be stably chelated, and leads the reduced water-soluble Cr to be6+And will not return to recovery.
The anhydrous sodium sulphate and the calcium formate are added into the high-performance high-efficiency powder chromium reducing agent, so that the chromium reducing agent participates in the hydration reaction of cement, crystal nuclei in early cement play a role in catalyzing and promoting the hydration, the reduction effect of water-soluble hexavalent chromium is accelerated, the chromium reducing efficiency is improved, and the effect is more obvious on the cement with relatively poor active ingredients and high chromium content.
The dispersing agent is added into the high-performance high-efficiency powder chromium reducing agent, has good wrapping property on the chromium reducing agent, simultaneously has good dispersibility, stability and uniformity, improves the uniformity of the dispersion of the chromium reducing agent, and has good activity and keeps the consistency of material performance when participating in cement grinding.
Test 1
The determination of the water-soluble (VI) content in the air white cement (clinker) sample and the cement doped with a certain proportion of high-performance high-efficiency powder chromium-reducing agent is carried out by adopting the method of national standard GB31893 limit and determination method of water-soluble chromium (VI) of cement appendix A determination method of water-soluble chromium (VI) in cement dibenzoyl dihydrazide spectrophotometry, which specifically comprises the following steps: mixing and uniformly stirring a cement sample, standard sand and water to form cement mortar, wherein the dosage of the standard sand is three times that of the cement sample, and the dosage of the water is half of that of the cement sample; filtering the cement mortar to obtain filtrate; taking 5.0ml of filtrate, adding water to dilute the filtrate to 20ml, adding 5.0ml of dibenzoyl dihydrazide solution into the filtrate, adjusting the pH to be between 2.0 and 2.5 by using 1mol/L hydrochloric acid, fixing the volume to a proper volumetric flask, standing for 15min, measuring the absorbance of the solution at 540nm by using a spectrophotometer, checking the concentration of water-soluble hexavalent chromium in the solution on a working curve, and calculating the hexavalent chromium content according to the concentration of the water-soluble hexavalent chromium.
The results of measuring the content of hexavalent chromium after the high-performance and high-efficiency powder chromium reducer for reducing water-soluble chromium (VI) in cement obtained in examples 1 to 5 was doped into cement are shown in Table 1.
TABLE 1 result of water-soluble Cr (VI) content in cement doped with high-performance high-efficiency powder chromium reducer
As can be seen from Table 1, the high-efficiency and high-performance powder chromium reducing agent of the embodiments 1 to 5 has a remarkably reduced water-soluble chromium (VI) content compared with that of blank cement after being applied to cement, and the chromium reducing rate can reach more than 50%.
Test 2
The chromium reducing agent for reducing the water-soluble chromium (VI) in the cement prepared in the above examples 1 to 3 is used for grinding clinker and gypsum by a phi 500 x 500 cement test mill in the same grinding time according to the mixing amount of 0.20% of the cement mass to prepare the small-mill cement. The standard consistency water requirement, setting time, strength and fluidity of 3 prepared small mill cements using the powder chromium reducer of the invention and a blank small mill cement (comparative example 1) not using the powder chromium reducer of the invention were respectively tested, and the test results are shown in table 2; wherein, the detection method mainly refers to standard methods such as GB/T1346-.
TABLE 2 table of the results of testing the physical properties of the cement using the powder chromium-reducing agent
The stability tests show that the stability of the blank cement and the cement blended with the cement of the examples 1 to 3 is uniform and qualified. As can be seen from Table 2, after the high-efficiency high-performance powder chromium reducer of the embodiments 1 to 3 is applied to cement, the content of water-soluble chromium (VI) is obviously reduced compared with that of blank cement, and the index meets the requirement of less than or equal to 10mg/kg specified in GB31893-2015 Limit and determination method for water-soluble chromium (VI) in cement; the physical properties of the cement are not influenced, the mechanical property indexes such as the setting time, the volume stability, the strength and the like are changed slightly, the rheological working properties of the cement are basically consistent, and the high-efficiency high-performance powder chromium reducing agent has better adaptability to the quality properties of the cement.
Test 3
The chromium reducing agent for reducing the water-soluble chromium (VI) in the cement prepared in the above examples 1 to 3 is used for grinding clinker and gypsum by a phi 500 x 500 cement test mill in the same grinding time according to the mixing amount of 0.20% of the cement mass to prepare the small-mill cement. After different cements are respectively sealed and placed for 7d, 14d, 30d, 45d and 60d, samples are taken to determine the content of water-soluble chromium (VI) in the small mill cement, and the results are shown in Table 3.
TABLE 3 results of water-soluble chromium (VI) content of cement using chromium reducer in different standing periods
As can be seen from Table 3, the cement using the chromium-reducing agent has a substantially stable chromium content with the increase of the storage time of the cement, and the water-soluble Cr after reduction is not caused with the increase of the storage time of the cement6+And returning to restore.
In conclusion, the high-performance high-efficiency powder chromium-reducing agent for reducing water-soluble chromium (VI) in cement, which is obtained by the invention, has the following advantages: (1) the water-soluble chromium (VI) content in the cement can be effectively reduced, and the chromium reduction effect is obvious; (2) the method adopts a new technology of an efficient chelating stabilizer, and water-soluble chromium (VI) reduced in cement can not return to recovery; (3) the high-performance high-efficiency powder chromium-reducing agent does not affect the mechanical properties such as cement setting time, volume stability, strength and the like, does not affect the rheological working performance of the cement, the durability of the cement and the like, and has better adaptability to the quality performance of the cement; (4) the material has the characteristics of stable performance, good blanking fluidity and the like; (5) the high-performance high-efficiency powder chromium-reducing agent is used for reducing the chromium content and is an environment-friendly cement process additive.
Although the present invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The chromium reducing agent for reducing water-soluble chromium (VI) in cement is characterized by comprising the following preparation raw materials: chromium reducing agent, stabilizer, catalyst and dispersing carrier.
2. The chromium (VI) reducer for reducing water-soluble chromium (VI) in cement as claimed in claim 1, wherein said chromium reducer is one or more of sodium thiosulfate, ferrous sulfate, ferrous citrate and anhydrous sodium sulfite.
3. The chromium (VI) reducer for reducing water-soluble chromium in cement as claimed in claim 1, wherein said stabilizer is ascorbic acid VCOne or more of nitrilotriacetic acid, oligomeric glucose, polydextrose, sodium oxalate and disodium ethylene diamine tetraacetate.
4. The chromium-reducing agent for reducing the water-soluble chromium (VI) in the cement as claimed in claim 1, wherein the catalyst is one or two of anhydrous sodium sulphate and calcium formate.
5. The chromium-reducing agent for reducing the water-soluble chromium (VI) in the cement as claimed in claim 1, wherein the dispersion carrier is one or two of fly ash and heavy calcium powder.
6. The chromium-reducing agent for reducing water-soluble chromium (VI) in cement as claimed in claim 1, wherein the amount of said raw materials is: 30.0-60.0% of chromium reducing agent, 2.0-20.0% of stabilizer, 2.0-15.0% of catalyst and 10.0-40.0% of dispersing carrier.
7. The chromium (vi) reducer for reducing water-soluble chromium (vi) in cement according to claim 2, wherein the chromium reducing agent comprises: 0-30.0% of sodium thiosulfate, 0-40.0% of ferrous sulfate, 0-10.0% of ferrous citrate, 0-10.0% of nitrilotriacetic acid and 0-10.0% of anhydrous sodium sulfite, which account for the mass percentage of the chromium reducing agent.
8. Use according to claim 3 forA chromium-reducing agent for reducing water-soluble chromium (vi) in cement, characterized in that the stabilizer comprises: ascorbic acid VC0-5.0% of oligoglucose, 0-10.0% of polydextrose, 0-10.0% of sodium oxalate, 0-8.0% of disodium ethylene diamine tetraacetate and the weight percentage of the chromium reducing agent.
9. The chromium (VI) reducer for reducing water-soluble chromium in cement according to claim 4, wherein said catalyst comprises: 0-6% of anhydrous sodium sulphate and 0-10.0% of calcium formate, which account for the mass percentage of the chromium reducing agent.
10. A preparation method of a chromium reducing agent for reducing water-soluble chromium (VI) in cement is characterized by comprising the following steps:
step 1, preparing a dispersant carrier material for later use;
step 2, adding a chromium reducing agent into the dispersant carrier material, and uniformly mixing and stirring to obtain mixed powder;
step 3, respectively preparing a stabilizer and a catalyst for later use;
and 4, sequentially adding the stabilizer and the catalyst into the mixed powder, and uniformly mixing and stirring to obtain the catalyst.
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