CN110467372B - Hexavalent chromium reducing agent for cement and preparation method thereof - Google Patents
Hexavalent chromium reducing agent for cement and preparation method thereof Download PDFInfo
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- CN110467372B CN110467372B CN201910759475.1A CN201910759475A CN110467372B CN 110467372 B CN110467372 B CN 110467372B CN 201910759475 A CN201910759475 A CN 201910759475A CN 110467372 B CN110467372 B CN 110467372B
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- 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
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- 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
- C04B2103/0096—Reducing agents
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Abstract
The hexavalent chromium reducing agent for the cement comprises the following components in parts by weight: 5-80 parts of metal antimony oxide, 5-95 parts of inorganic silicate, 1-20 parts of antimony compound, 1-10 parts of dispersant and 0.5-5 parts of reduction synergist; the hexavalent chromium reducing agent for cement prepared by the invention has the characteristics of good reducibility, stability, long-term conservation, safety and reliability, no influence on the quality and safety of cement products, no harm to human bodies and no other environmental pollution, and the preparation process is simple and reasonable.
Description
Technical Field
The invention relates to the technical field of pollutant treatment, in particular to a hexavalent chromium reducing agent for cement and a preparation method thereof.
Background
Chromium is generally distributed in the earth's crust in oxidation states generally ranging from divalent to hexavalent chromium, with chromium being present in trivalent form in soils and rocks. With the rapid development of modern industry, the hexavalent form of chromium is now widely present in the earth's surface, both the trivalent and hexavalent forms of chromium are toxic, and the toxicity of trivalent chromium is 100 times lower than hexavalent chromium.
Calcination during the manufacture of cement clinker introduces hexavalent chromium contamination of the cement. Hexavalent chromium has high water solubility and strong permeability, and is easy to permeate into human tissues to cause diseases such as dermatitis, fester and the like. After the hexavalent chromium in the concrete which is drenched or soaked for a long time is dissolved out, the hexavalent chromium is brought into a reservoir or is infiltrated underground to cause chromium pollution of a drinking water source. It is therefore necessary to reduce hexavalent chromium to a trivalent chromium form with low toxicity.
At present, the water-soluble hexavalent chromium reducing agent in the common reduced cement comprises sulfite, such as ferrous sulfate, stannous sulfate and the like. Stannous sulfate is an ideal hexavalent chromium reducing agent for cement, but the stannous sulfate is expensive and is difficult to put into practical production. Ferrous sulfate is an ideal reducing agent, but in the cement production process, the reduction effect is not ideal due to the clinker temperature, the heat generated by grinding and weather reasons, and the investment is increased to maintain the reduction effect, so that the potential risk is brought to the cement quality safety. Therefore, there is a need for a hexavalent chromium reducing agent for cement, which can achieve high reduction effect, stability and safety without affecting the quality safety of cement products.
Disclosure of Invention
The invention aims to provide a hexavalent chromium reducing agent for cement, which has the characteristics of good reducibility, stability, long-term preservation property and safety reliability, and does not influence the quality safety of cement products, harm to human bodies and other environmental hazards.
The invention also aims to provide a preparation method of the hexavalent chromium reducing agent for the cement, which has a simple and reasonable preparation process, has low equipment investment and maintenance cost, and can ensure the quality stability of products.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hexavalent chromium reducing agent for cement comprises the following components in parts by weight: 5-80 parts of metal antimony oxide, 5-95 parts of inorganic silicate, 1-20 parts of antimony compound, 1-10 parts of dispersant and 0.5-5 parts of reduction synergist.
The invention provides a hexavalent chromium reducing agent for cement, which mainly reduces water-soluble hexavalent chromium ions in hexavalent chromium pollutants (cement or other concrete) into insoluble trivalent chromium by utilizing metal antimony oxide and antimony ions in antimony compounds, wherein the metal antimony oxide and the antimony compounds in certain parts by weight are combined, so that the antimony compounds can further assist the metal antimony oxide to reduce the water-soluble hexavalent chromium into the trivalent chromium in water after meeting water, and provide continuous antimony ion supply, thereby greatly improving the reduction effect of the hexavalent chromium reducing agent for cement; meanwhile, the reduced trivalent chromium is wrapped in the silicate crystal after the inorganic silicate is hydrated, so that the further harmless treatment is realized. In addition, the dispersant has the effect of uniformly dispersing all components, so that the hexavalent chromium reducing agent for cement can be rapidly and uniformly dispersed in pollutants, and the reduction effect is improved; meanwhile, the reduction synergist is utilized to prevent reducing substances such as metal antimony oxide, antimony compound and the like from being oxidized in the cement preparation process (before cement hydration), so that the stability of the reducing agent is greatly improved, and the activity of the hexavalent chromium reducing agent for cement is effectively maintained.
The hexavalent chromium reducing agent for cement prepared by the invention has wide application, such as being used for mixing the hexavalent chromium polluted soil and effluent water in cement mixture (or concrete), polluted underground water, polluted workshop waste water, or solid mixture of polluted soil, cement and the like. The hexavalent chromium reducing agent for cement has the advantages of improving the reduction effect by more than 30 percent compared with the current commercial products, improving the quality stability of the products by 50 to 90 percent compared with the current commercial products, improving the quality guarantee period of the products by 2 to 4 times, having good reducibility, stability, long-term preservation, safety and reliability, low cost, and having no influence on the quality safety of the cement products, no harm to human bodies and no other environmental pollution.
Further, the metal antimony oxide is antimony trioxide. According to the invention, antimony trioxide and an antimony compound are combined, and the antimony compound is utilized to ensure continuous and stable supply of antimony ions, so that the antimony ions fully reduce water-soluble hexavalent chromium ions in hexavalent chromium pollutants into insoluble trivalent chromium, and the reduction effect is greatly improved.
Further, the inorganic silicate is formed by compounding one or more than two of sodium aluminosilicate, montmorillonite, kaolin, fly ash, feldspar powder, wollastonite, mica powder, magnesium silicate and calcium silicate. The invention adopts the inorganic silicate to effectively wrap the reduced trivalent chromium in the silicate crystal, thereby realizing more efficient and stable reduction effect.
Further, the antimony compound is prepared by compounding one or more than two of sodium antimonate, antimony trichloride, antimony pentachloride, antimony phosphite, antimony polyphosphate and antimony complex. By adopting the antimony compound, the antimony compound can effectively assist the metal antimony oxide to reduce the water-soluble hexavalent chromium in the water solution into trivalent chromium after meeting water, so that stable and continuous antimony ion supply is ensured, and the reduction effect of the hexavalent chromium reducing agent for cement is improved.
Further, the dispersing agent is formed by compounding one or more than two of oleamide, distearamide, monoglyceride and active terminal hydroxyl alcohol ester. The dispersant can uniformly disperse all components in the hexavalent chromium reducing agent for cement in the production process, so that the hexavalent chromium reducing agent for cement can be rapidly and uniformly dispersed in pollutants when the pollutants are met, and the stable reduction effect is ensured.
Further, the reduction synergist is hydroquinone, or bayberry tannin extract, or is formed by compounding hydroquinone and bayberry tannin extract. The reduction synergist used in the invention is hydroquinone and/or bayberry tannin extract, which can ensure the stability of reducing substances in the hexavalent chromium reducing agent for cement in the cement preparation process and further maintain the activity of the hexavalent chromium reducing agent for cement.
A method for preparing a hexavalent chromium reducing agent for cement comprises the following steps:
step 1), heating an antimony white furnace, putting metal antimony into the antimony white furnace for melting, simultaneously starting a blower to oxidize and volatilize the metal antimony into metal antimony oxide furnace gas, cooling and crystallizing the metal antimony oxide furnace gas by a flue gas quenching and mixing device arranged at an outlet of the antimony white furnace, and collecting the metal antimony oxide by a pulse type cloth bag dust collector;
step 2), respectively homogenizing the inorganic silicate, the antimony compound, the dispersant and the reduction synergist, respectively drying, scattering and sieving by more than 200 meshes, and respectively filling into respective feeding tanks for later use;
and 3) according to the proportion, respectively and simultaneously putting the metal antimony oxide, the inorganic silicate, the antimony compound, the dispersing agent and the reduction synergist into a conical mixer from different input ports, and continuously and circularly homogenizing by an airflow device and a rapid stirring device to obtain the hexavalent chromium reducing agent for cement.
The hexavalent chromium reducing agent for cement prepared by the production preparation process has the advantages of simple and reasonable process steps, low equipment investment and maintenance cost, and good quality stability of the prepared product.
Further explaining, in the step 1), the temperature of the antimony white furnace is 1000-1100 ℃, and the heating mode is any one of electric heating and natural gas or coke heating; the cooling crystallization temperature is 80-500 ℃, the volume ratio of the total amount of the high-temperature metal antimony oxide flue gas to the quenching air is 1: 1-100, and the air flow of the cooling pipeline is 100m3～750m3。
Further explaining, in the step 2), the drying temperature is 60-200 ℃, and the drying mode is any one of the drying by using the waste heat of an antimony white furnace, electric heating or natural gas heating; the mesh passing holes are more than 250 meshes; the volume of the feeding tank is 2m3～100m3And is provided with a heat preservation heating device.
To explain further, in step 3), the volume of the conical mixer is 2m3～100m3And is provided with a heat preservation heating device.
The invention has the beneficial effects that: according to the invention, the metal antimony oxide and antimony ions in the antimony compound are utilized to reduce the water-soluble hexavalent chromium ions in the hexavalent chromium pollutants into insoluble trivalent chromium, and after the antimony compound is in contact with water, the metal antimony oxide can be further assisted to reduce the water-soluble hexavalent chromium in the water into trivalent chromium, so that continuous antimony ion supply is provided, and the reduction effect of the hexavalent chromium reducing agent for cement is greatly improved; meanwhile, after the inorganic silicate is hydrated, the reduced trivalent chromium is wrapped in the silicate crystal, so that the further harmless treatment is achieved. In addition, the dispersant has the effect of uniformly dispersing all components, so that the hexavalent chromium reducing agent for cement can be rapidly and uniformly dispersed in pollutants, and the reduction effect is improved; meanwhile, the reduction synergist is utilized to prevent reducing substances such as metal antimony oxide, antimony compound and the like from being oxidized in the cement preparation process, so that the stability of the cement is greatly improved, and the activity of the hexavalent chromium reducing agent for the cement is effectively maintained. The hexavalent chromium reducing agent for cement has the characteristics of good reducibility, stability, long-term preservation, safety and reliability, low cost, no influence on the quality and safety of cement products, no harm to human bodies and no other environmental pollution.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments.
A method for preparing a hexavalent chromium reducing agent for cement comprises the following steps:
step 1), heating an antimony white furnace to 1000 ℃, putting metal antimony into the antimony white furnace for melting, simultaneously starting a blower to oxidize and volatilize the metal antimony into metal antimony oxide furnace gas, cooling and crystallizing at 80 ℃ by installing a flue gas quenching mixing device at an outlet of the antimony white furnace, wherein the volume ratio of the total amount of the high-temperature metal antimony oxide flue gas to quenching air is 1:1, and the air flow of a cooling pipeline is 100m3Collecting the metal antimony oxide by a pulse type bag dust collector;
step 2), respectively homogenizing the inorganic silicate, the antimony compound, the dispersant and the reduction synergist, respectively drying at 200 ℃, scattering, sieving by more than 200 meshes, respectively filling into the containers with the respective input volume of 2m3In the feeding tank, a heat preservation is providedThe heating device is used for standby;
step 3), according to the mixture ratio, the metal antimony oxide, the inorganic silicate, the antimony compound, the dispersant and the reduction synergist are respectively and simultaneously put into the container with the volume of 2m from different input ports3The hexavalent chromium reducing agent for cement can be obtained after continuous circulation homogenization by an airflow device and a rapid stirring device in the conical mixer.
According to the preparation method of the hexavalent chromium reducing agent for cement, the hexavalent chromium reducing agent for cement is prepared by combining the component proportions in the following examples 1-6:
example 1
1) 5 parts of antimony trioxide;
2) 47 parts of inorganic silicate: wherein the sodium aluminosilicate (15 parts), the montmorillonite (6 parts), the kaolin (6 parts) and the fly ash (20 parts),
3) 12 parts of antimony compound: wherein, the sodium antimonate (7 parts) and the antimony trichloride (5 parts);
4) 8 parts of a dispersing agent: wherein, the oleic acid amide (5 parts) and the monoglyceride (3 parts);
5) 3 parts of a reduction synergist: wherein, the tannin extract comprises 1 part of hydroquinone and 2 parts of bayberry tannin extract.
Example 2
1) 10 parts of antimony trioxide;
2) 55 parts of inorganic silicate: wherein, the kaolin is 10 parts, the feldspar powder is 7 parts, the wollastonite is 3 parts, the fly ash is 20 parts, the mica powder is 5 parts, the magnesium silicate is 3 parts, and the calcium silicate is 7 parts;
3) 20 parts of antimony compound: wherein, the antimony phosphite (8 parts), the antimony polyphosphate (8 parts) and the complex antimony (4 parts);
4) 10 parts of a dispersing agent: wherein, the bis stearamide (5 parts), the active end group hydroxyl alcohol ester (5 parts);
5) 4 parts of a reduction synergist: wherein, the tannin extract comprises 2 parts of hydroquinone and 2 parts of bayberry tannin extract.
Example 3
1) 80 parts of antimony trioxide;
2) 5 parts of inorganic silicate: wherein, kaolin (2 parts), wollastonite (1 part) and fly ash (2 parts);
3) 1 part of antimony compound: wherein, the sodium antimonate (1 part);
4) 10 parts of a dispersing agent: wherein, the distearamide (8 parts) and the monoglyceride (2 parts) are adopted;
5) 5 parts of a reduction synergist: wherein, hydroquinone (0.5 portion) and bayberry tannin extract (4.5 portions).
Example 4
1) 15 parts of antimony trioxide;
2) 55 parts of inorganic silicate: wherein, the montmorillonite is 10 portions, the kaolin is 10 portions, and the fly ash is 35 portions;
3) 5 parts of antimony compound: wherein, the antimony polyphosphate (2 portions), the antimony trichloride (1 portion) and the complex antimony (2 portions);
4) 1 part of a dispersant: wherein, the oleic acid amide (0.5 portion), the active terminal hydroxyl alcohol ester (0.5 portion);
5) 4 parts of a reduction synergist: wherein, the tannin extract comprises 2 parts of hydroquinone and 2 parts of bayberry tannin extract.
Example 5
1) 18 parts of antimony trioxide;
2) 55 parts of inorganic silicate: wherein, the fly ash (50 parts) and the calcium silicate (5 parts);
3) 6 parts of antimony compound: wherein, the main components of the coating comprise 1 part of antimony phosphite, 2 parts of antimony trichloride and 3 parts of sodium antimonate;
4) 10 parts of a dispersing agent: wherein, the oleic acid amide (2 parts), the bis-stearamide (3 parts), the active end group hydroxyl alcohol ester (2 parts) and the monoglyceride (3 parts);
5) 0.5 part of reduction synergist: wherein the bayberry tannin extract (0.5 part).
Example 6
1) 20 parts of antimony trioxide;
2) 95 parts of inorganic silicate: wherein, the composition comprises 8 parts of sodium aluminosilicate, 4 parts of montmorillonite, 8 parts of kaolin, 9 parts of wollastonite, 14 parts of feldspar powder, 37 parts of fly ash, 10 parts of calcium silicate and 5 parts of magnesium silicate;
3) 6 parts of antimony compound: wherein, the sodium antimonate (1 part), the antimony trichloride (3 parts) and the complex antimony (2 parts);
4) 7 parts of a dispersing agent: wherein, the oleic acid amide (3 parts), the monoglyceride (3 parts) and the active end-group hydroxyl alcohol ester (1 part);
5) 3.5 parts of a reduction synergist: wherein, the tannin extract comprises 1 part of hydroquinone and 2.5 parts of bayberry tannin extract.
Comparative example 1
1) 20 parts of antimony trioxide;
2) 5 parts of antimony compound: wherein, the sodium antimonate (1 part), the antimony polyphosphate (2 parts) and the complex antimony (2 parts);
3) 10 parts of a dispersing agent: wherein, the oleic acid amide (3 parts), the monoglyceride (3 parts) and the active end-group hydroxyl alcohol ester (4 parts);
4) 3.5 parts of a reduction synergist: wherein, the tannin extract comprises 1 part of hydroquinone and 2.5 parts of bayberry tannin extract.
Comparative example 2
1) 15 parts of antimony trioxide;
2) 75 parts of inorganic silicate: wherein, the composition comprises (by weight parts) sodium aluminosilicate (6 parts), montmorillonite (3 parts), kaolin (7 parts), wollastonite (9 parts), feldspar powder (7 parts), fly ash (30 parts), calcium silicate (8 parts) and magnesium silicate (5 parts);
3) 7 parts of a dispersing agent: wherein, the oleic acid amide (3 parts), the monoglyceride (3 parts) and the active end-group hydroxyl alcohol ester (1 part);
4) 2 parts of a reduction synergist: wherein, the tannin extract comprises 1 part of hydroquinone and 1 part of bayberry tannin extract.
Comparative example 3
1) 18 parts of antimony trioxide;
2) 95 parts of inorganic silicate: wherein, the composition comprises 8 parts of sodium aluminosilicate, 4 parts of montmorillonite, 8 parts of kaolin, 9 parts of wollastonite, 14 parts of feldspar powder, 37 parts of fly ash, 10 parts of calcium silicate and 5 parts of magnesium silicate;
2) 15 parts of antimony compound: wherein, the antimony phosphite (10 parts), the antimony trichloride (3 parts) and the complex antimony (2 parts);
4) 1.5 parts of reduction synergist: wherein, the tannin extract comprises 1 part of hydroquinone and 0.5 part of bayberry tannin extract.
Comparative example 4
1) 30 parts of antimony trioxide;
2) 69 parts of inorganic silicate: wherein, the sodium aluminosilicate (8 parts), the montmorillonite (7 parts), the kaolin (5 parts), the wollastonite (20 parts), the feldspar powder (14 parts), the calcium silicate (10 parts) and the magnesium silicate (5 parts);
3) 2 parts of antimony compound: wherein antimony pentachloride (2 parts);
4) 7 parts of a dispersing agent: wherein, the oleic acid amide (3 parts), the monoglyceride (3 parts) and the active end-group hydroxyl alcohol ester (1 part);
in order to test the reduction effect of the hexavalent chromium reducing agent for cement of the above examples 1 to 6 and comparative examples 1 to 4 on water-soluble hexavalent chromium in cement, a comparative cement test sample and a cement test sample doped with the hexavalent chromium reducing agent for cement of the examples 1 to 6 and comparative examples 1 to 4 were prepared, wherein the comparative cement test sample preparation method was as follows:
1) preparing materials: preparing a sufficient amount of cement clinker and gypsum, and crushing the clinker and the gypsum to less than 7 mm;
2) preparation of comparative cement test samples: using a test mill
And (5) grinding. Putting 4.75kg of cement clinker and 0.25kg of gypsum into a small test mill, and grinding for 30min to obtain a comparative cement test sample;
3) the preparation of the cement doped with the hexavalent chromium reducing agent for the cement of the embodiments 1 to 6 comprises the following steps: using a test mill
And (5) grinding. Putting 4.75kg of cement clinker, 0.25kg of gypsum and 1g of hexavalent chromium reducing agent for cement prepared in the embodiment 1-6 into a small testing mill, and grinding for 30min to obtain a cement test sample in the embodiment 1-6;
4) and (3) sequentially preparing the cement doped with the hexavalent chromium reducing agent for the cement in the comparative examples 1-4 according to the method in the step 3), so as to obtain the cement test samples in the comparative examples 1-4.
The content of hexavalent chromium in the cement doped with the hexavalent chromium reducing agent for the cement of examples 1 to 6 and comparative examples 1 to 4 is measured according to GB 31893-2015 limit and determination method for water-soluble chromium (VI) in the cement; detecting the standard consistency, the setting time and the stability of the cement according to GB/T1346-; the cement test block is manufactured, maintained and tested according to GB/T17671-1999 method for testing cement mortar strength (ISO method), and the test results are shown in tables 1 and 2.
TABLE 1 comparison of water-soluble hexavalent chromium content in different cement test samples
According to table 1, the content of water-soluble hexavalent chromium in the cement test sample doped with the hexavalent chromium reducing agent for cement in the embodiments 1 to 6 is obviously reduced compared with the content of water-soluble hexavalent chromium in the comparative cement test sample, and reaches a value below 2mg/kg specified by european union Directive2003/53/EC, and after 0 day and 90 days, the content of water-soluble hexavalent chromium in the cement is basically unchanged, which shows that the stability of the hexavalent chromium reducing agent for cement is good, and the effect of the hexavalent chromium reducing agent for cement on reducing water-soluble hexavalent chromium ions can be ensured after the cement is stored for a long time. The content of water-soluble hexavalent chromium in the cement test sample doped with the hexavalent chromium reducing agent for cement of comparative examples 1 to 4 is reduced compared with the content of water-soluble hexavalent chromium in the comparative cement test sample, but the reduced amount is significantly smaller than that of the cement doped with the hexavalent chromium reducing agent for cement of examples 1 to 6, and the content of water-soluble hexavalent chromium increases after 90 days in the cement doped with the hexavalent chromium reducing agent for cement of comparative example 1, and the long-term stability is poor.
TABLE 2 comparison of physical Properties of different Cement test samples
According to the detection results in table 2, the cement test sample doped with the hexavalent chromium reducing agent for cement and the comparative cement test sample provided by the invention have the advantages that the detection items such as the water consumption for the standard consistency (the variation value is within +/-0.1), the setting time (the variation value is within +/-10 min), the cement stability and the like are within the error range, in the comparison of the cement mortar strength, the early strength variation amplitude of the cement test sample in the embodiment is within-0.3 to +0.6MPa, the later strength variation amplitude is within-0.1 to +0.9MPa, and the cement stability is qualified.
Therefore, the test results of the above tables 1 and 2 show that the hexavalent chromium reducing agent for cement prepared by the method for preparing a hexavalent chromium reducing agent for cement of the present invention has a good effect of reducing water-soluble hexavalent chromium in cement to trivalent chromium, has good long-term preservation, is highly stable and safe, and does not have adverse effects on the quality of cement products.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (5)
1. A hexavalent chromium reducing agent for cement is characterized in that: the paint comprises the following components in parts by weight:
5 to 80 parts of a metal antimony oxide,
5 to 95 parts of an inorganic silicate,
1 to 20 parts of an antimony compound,
1 to 10 parts of a dispersant,
0.5-5 parts of a reduction synergist;
the dispersing agent is formed by compounding one or more than two of oleamide, distearamide, monoglyceride and active terminal hydroxyl alcohol ester; the reduction synergist is hydroquinone, or bayberry tannin extract, or is formed by compounding hydroquinone and bayberry tannin extract; the metal antimony oxide is antimony trioxide; the inorganic silicate is formed by compounding one or more than two of sodium aluminosilicate, montmorillonite, kaolin, fly ash, feldspar powder, wollastonite, mica powder, magnesium silicate and calcium silicate; the antimony compound is formed by compounding one or more than two of sodium antimonate, antimony trichloride, antimony pentachloride, antimony phosphite, antimony polyphosphate and antimony complex.
2. A method of preparing a hexavalent chromium reducing agent for cement according to claim 1, comprising the steps of:
step 1), heating an antimony white furnace, putting metal antimony into the antimony white furnace for melting, simultaneously starting a blower to oxidize and volatilize the metal antimony into metal antimony oxide furnace gas, cooling and crystallizing the metal antimony oxide furnace gas by a flue gas quenching and mixing device arranged at an outlet of the antimony white furnace, and collecting the metal antimony oxide by a pulse type cloth bag dust collector;
step 2), respectively homogenizing the inorganic silicate, the antimony compound, the dispersant and the reduction synergist, respectively drying, scattering and sieving by more than 200 meshes, and respectively filling into respective feeding tanks for later use;
and 3) according to the proportion, respectively and simultaneously putting the metal antimony oxide, the inorganic silicate, the antimony compound, the dispersing agent and the reduction synergist into a conical mixer from different input ports, and continuously and circularly homogenizing by an airflow device and a rapid stirring device to obtain the hexavalent chromium reducing agent for cement.
3. The method for preparing a hexavalent chromium reducing agent for cement according to claim 2, wherein: in the step 1), the temperature of the antimony white furnace is 1000-1100 ℃, and the heating mode is any one of electric heating and natural gas or coke heating; the cooling crystallization temperature is 80-500 ℃, the volume ratio of the total amount of the high-temperature metal antimony oxide flue gas to the quenching air is 1: 1-100, and the air flow of the cooling pipeline is 100m3～750m3。
4. The method for preparing a hexavalent chromium reducing agent for cement according to claim 2, wherein: in the step 2), the drying temperature is 60-200 ℃, and the drying mode is any one of waste heat drying, electric heating or natural gas heating drying of an antimony white furnace; the mesh passing holes are more than 250 meshes; the volume of the feeding tank is 2m3～100m3And is provided with a heat preservation heating device.
5. The method for preparing a hexavalent chromium reducing agent for cement according to claim 2, wherein: in step 3), conical mixingThe volume of the container is 2m3～100m3And is provided with a heat preservation heating device.
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| CN112456831B (en) * | 2020-10-13 | 2023-10-03 | 唐山冀东水泥外加剂有限责任公司 | High-temperature-resistant cement hexavalent chromium reducing agent |
| CN112500014A (en) * | 2020-11-20 | 2021-03-16 | 华润水泥技术研发有限公司 | Preparation method of hexavalent chromium reducing agent for high-temperature-resistant cement |
| CN112500013A (en) * | 2020-11-20 | 2021-03-16 | 华润水泥技术研发有限公司 | Preparation method of nano-loaded hexavalent chromium reducing agent for cement |
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| EP1923370A1 (en) * | 2006-11-02 | 2008-05-21 | Mapei S.p.A. | Additives and methods for reducing hexavalent chromium in cement and cement based materials |
| CN102616847B (en) * | 2012-04-05 | 2014-03-26 | 广西华锑科技有限公司 | Method for preparing catalyst grade antimony trioxide |
| CN103894406B (en) * | 2014-03-18 | 2015-11-18 | 江苏维尔利环保科技股份有限公司 | The reparation of wet method detoxifcation associating stabilisation is containing the method for chromium-polluted soil |
| CN108545982A (en) * | 2018-05-14 | 2018-09-18 | 昆明理工大学 | A kind of cement hexavalent chrome reduction agent |
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