CN114230240A - Slow release material for stabilizing treatment of barium slag and stabilizing treatment method of barium slag - Google Patents
Slow release material for stabilizing treatment of barium slag and stabilizing treatment method of barium slag Download PDFInfo
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- CN114230240A CN114230240A CN202111350674.0A CN202111350674A CN114230240A CN 114230240 A CN114230240 A CN 114230240A CN 202111350674 A CN202111350674 A CN 202111350674A CN 114230240 A CN114230240 A CN 114230240A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
- C04B2111/00784—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes for disposal only
Abstract
The invention discloses a sustained-release material for stabilizing and treating barium slag, which comprises sulfate and an anion adsorption material, and also discloses an application method of the sustained-release material for stabilizing and treating the barium slag. The slow release material provided by the invention can stably treat the barium slag, does not cause higher sulfate ion concentration in the barium slag leachate after treatment even if the medicament is excessively added, and has the advantages of simple application method and easy operation.
Description
Technical Field
The invention relates to the technical field of barium slag treatment, in particular to a slow-release material for stably treating barium slag and a method for stably treating the barium slag.
Background
The barium slag is industrial barium slag generated in the production of barium carbonate from barite. The method is characterized in that barite is used as a raw material, and solid slag remained after high-temperature calcination, cooling and hot water leaching are carried out on the barite and coal slag. 0.8-1 ton of barium slag is generated when one ton of barium salt is produced, the barium slag contains acid-soluble barium, water-soluble barium, silicate clinker and the like, has higher barium ion leaching characteristic and belongs to dangerous waste. If the barium slag is directly stacked, barium ions in leaching leachate of the barium slag can pollute underground water, so that people are poisoned after drinking the underground water, and the health of the people is seriously harmed. Therefore, the treatment of barium slag is an important problem in the production of barium carbonate.
When treating barium slag, it mainly uses sulfate agent, and it is constructed by mixing and stirring the ectopic agent or injecting the original agent. The realization principle is as follows: the indissolvable substances such as barium sulfate and the like are formed by free sulfate ions in the sulfate medicament and barium ions in the leaching solution of barium residues, so that a large amount of barium ions are prevented from being leached.
Due to different occurrence forms or combination forms of barium in barium residues generated in different production processes and different stages in the same process, the content of barium in the waste residues in different areas is different, and the barium content and the leaching rate of barium have no regular corresponding relationship. Specifically, for example: the existing form of barium in the barium slag includes but is not limited to barium sulfate, barium sulfide, barium carbonate, barium chloride and the like, so that some barium slag with high barium content is leached to reach the standard (the main form is barium sulfate possibly), and some barium slag with low barium content is leached to be higher, and finally the leaching concentration of the barium slag is uneven; the following steps are repeated: for barium residues with excessive leaching, leachate (10:1 water-solid ratio) prepared according to the hazardous waste identification standard leaching toxicity identification in GB 5085.3-2007 shows that barium ions can not be detected almost after one-time leaching is finished, namely, a second leaching test is carried out after the leachate is removed, but free barium ions can still be detected even if some barium residues with excessive leaching are subjected to multiple leaching tests.
Therefore, in the actual construction process, in order to ensure that the barium slag is completely and stably treated, based on the characteristic of uneven pollution distribution, when the adding amount of the reagent is determined, the higher leaching numerical value in random sampling is taken as the calculation basis of the adding amount, so that the sulfate reagent is excessively added in the actual treatment process. The treatment mode can obviously increase the concentration of sulfate ions in the treated barium residue leachate, easily cause higher concentration of sulfate ions in underground water and harm human health.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the treated barium residue leachate has higher sulfate ion concentration after adding excessive medicament in the prior art, thereby providing a slow-release material for stably treating barium residues and a method for stably treating barium residues.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the invention provides a sustained-release material for stably treating barium slag, which comprises sulfate and an anion adsorption material.
Preferably, the weight ratio of the sulfate to the anion adsorbing material is (1-2): 1.
preferably, the anion-adsorbing material is hydrotalcite.
Preferably, the hydrotalcite is a two-to-three-element hydrotalcite, preferably a calcium magnesium zinc aluminum hydrotalcite and/or a magnesium aluminum hydrotalcite.
Preferably, the sulfate is selected from one or more of sodium sulfate, ammonium sulfate, ferric sulfate, ferrous sulfate, alum and calcium sulfate; further, the sulfate is calcium sulfate.
Preferably, the sustained-release material for stabilizing and treating the barium slag further comprises a filling auxiliary material for reducing the porosity.
Preferably, the filling auxiliary material comprises clay mineral and/or cement.
Preferably, the weight ratio of the filling auxiliary materials to the sulfate is 1: (4-5).
The invention also provides a method for stabilizing and treating the barium slag, which comprises the following steps:
preparing a sample: preparing the sustained-release material for stably treating the barium slag;
treatment: and adding the slow-release material and water into the barium residues, uniformly stirring, and standing.
Preferably, after the slow-release material is added according to the highest molar concentration of barium ions in barium slag at different parts, the molar concentration of sulfate radicals is 1-1.4 times of that of the barium ions at the highest value, and the content of water after the slow-release material is added is 30-40 wt%. The molar concentration of barium ions in the barium slag is 10:1 was measured as the water-to-solid ratio.
The technical scheme of the invention has the following advantages:
1. according to the slow release material for stably treating the barium slag, the anion adsorption material is added and mixed with the sulfate, so that the whole material has a better slow release effect, sulfate ions in the slow release material release sulfate ions, and the sulfate ions are combined with barium ions in the barium slag to form a barium sulfate insoluble matter, so that the treatment of the barium slag is realized, and meanwhile, the contained anion adsorption material can adsorb sulfate ions released by redundant sulfate, so that the effect of regulating the concentration of the sulfate ions in the treated barium slag leachate is achieved.
2. According to the sustained-release material for stably treating barium slag, the anion adsorption material is preferably hydrotalcite, the layered structure of the hydrotalcite can provide exchangeable anion adsorption sites, particularly has a good inhibition effect on sulfate radicals, the interlayer anion exchange capacity is high, the effect of adjusting the concentration of the sulfate radicals in the leachate after treatment of the barium slag is very obvious, and the treated sulfate radicals in the leachate can reach the standard.
3. Tests show that the slow-release material for stably treating barium slag provided by the invention is preferably calcium-zinc-aluminum hydrotalcite and/or magnesium-aluminum hydrotalcite, and under the selection of the type, the slow-release material not only can achieve the effect of easily absorbing sulfate ions between layers of an anion adsorbing material, effectively reduces the concentration of the sulfate ions in leachate, but also has the effect of further and basically maintaining or reducing the concentration of the barium ions, and has very remarkable effect. The reason for this is that the hydrotalcite of the preferred type is likely to adsorb sulfate ions more easily between the layers, and the adsorption effect is smaller than the binding effect between sulfate ions and barium ions, and thus has no influence on the binding between sulfate ions and barium ions, and even is likely to have a position fixing effect on free sulfate ions, and thus promote the binding between free sulfate ions and barium ions. Thus, the preference of this type of hydrotalcite enables not only a further reduction of the sulphate ion concentration in the leachate, but also an effective maintenance or even a further reduction of the barium ion concentration in the leachate.
4. According to the sustained-release material for stably treating barium slag, calcium sulfate is preferably selected as the sulfate, and when the sulfate is used together with calcium-zinc-aluminum hydrotalcite, the concentration of sulfate ions in a leaching solution can be reduced to be within 50mg/L, and the leaching concentration of barium can be reduced to be within 3 mg/L.
5. The slow release material for stably treating barium slag further comprises a filling auxiliary material, wherein the filling auxiliary material comprises clay minerals and/or cement, and the weight ratio of the filling auxiliary material to sulfate is 1: (4-5), the barium residues belong to dangerous wastes, and after the barium residues are treated to meet the standard, the barium residues usually enter corresponding dangerous waste landfill sites to be buried, the treated barium residues still have percolate in the landfill sites, and the addition of filling auxiliary materials can reduce the migration characteristic of the percolate, so that the possibility of seepage of the treated barium residues percolate is reduced, and the seepage of the percolate is slowed down.
6. The application method of the sustained-release material for stably treating the barium slag provided by the invention is simple to operate and has higher stability for treating the barium slag.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
The barium residue used is shown in table 1:
TABLE 1 composition of barium residue
The type of the calcium magnesium zinc aluminum hydrotalcite is Jinqiang F7 which is purchased from Tianjin Jinqiang blue sea science and technology limited company; the type of the used magnalium hydrotalcite is HT-22, which is purchased from south China Adenwang chemical Co., Ltd; the calcium-zinc-aluminum hydrotalcite is available from Tianjin Jinheng blue sea technology ltd, and has the model of Jinheng F9; the rare earth hydrotalcite is rare earth calcium aluminum hydrotalcite, the product number of which is JH-59, and the hydrotalcite is purchased from Tianjin Jinheng blue sea science and technology Limited company;
the strength grade of the used cement is 42.5R, and the cement is purchased from Nippon Temminck & Gangshan building materials Co;
the clay mineral is selected from kaolin, sepiolite and bentonite; the Kaolin has a cargo number of yt058 and is purchased from New materials science and technology Limited of Yingteng in Lingshu county; sepiolite is purchased from processing plants for the thousand and long and minerals in Pingshan county; bentonite was purchased from Shanghai Korea, Jinhui, commercial Co., Ltd.
Example 1
The embodiment provides a sustained-release material for stably treating barium slag, which comprises the following raw materials:
60g of sodium sulfate and 30g of magnesium aluminum hydrotalcite with the model of HT-22.
The preparation method of the sustained-release material for stably treating the barium slag comprises the following steps: and mixing 60g of sodium sulfate and 30g of magnesium aluminum hydrotalcite uniformly.
The application method of the sustained-release material for stabilizing and treating the barium slag comprises the following specific steps:
preparing a sample: taking barium slag, and measuring the water content of the air-dried barium slag by adopting a drying-gravimetric method; simultaneously obtaining the stabilized treated barium slag to obtain a slow-release material; in this example, barium slag was obtained by using the composition ratios described in table 1.
Treatment: adding a slow-release material into the barium slag, so that the molar total amount of sulfate radicals in the added slow-release material is 1.4 times of the molar total amount of barium ions in the barium slag, uniformly mixing the added slow-release material after adding the slow-release material, then adding a proper amount of water according to the water content of the air-dried barium slag measured in the sample preparation step, so that the water content of the mixed barium slag is kept at about 30 percent, namely adding about 10g of water into every 100g of barium slag, and uniformly stirring; finally standing for 5 days to realize the treatment of the barium residue.
Example 2
The embodiment provides a sustained-release material for stably treating barium slag, which comprises the following raw materials:
50g of sodium sulfate and 50g of magnesium aluminum hydrotalcite with the model of HT-22.
The preparation method of the sustained-release material for stably treating the barium slag comprises the following steps: and mixing 50g of sodium sulfate and 50g of magnesium aluminum hydrotalcite uniformly.
The application method of the sustained-release material for stabilizing and treating the barium slag comprises the following specific steps:
preparing a sample: taking barium slag, and measuring the water content of the air-dried barium slag by adopting a drying-gravimetric method; simultaneously obtaining the stabilized treated barium slag to obtain a slow-release material; in this example, barium slag was obtained by using the composition ratios described in table 1.
Treatment: adding a slow-release material into the barium slag, so that the molar concentration of sulfate radicals in the barium slag after the slow-release material is added is 1 time of that of barium ions, uniformly mixing the added slow-release material, adding a proper amount of water according to the water content of the air-dried barium slag measured in the sample preparation step, and keeping the water content of the mixed barium slag at about 30%, namely adding about 10g of water into every 100g of barium slag, and uniformly stirring; finally standing for 5 days to realize the treatment of the barium residue.
Example 3
The only difference between the embodiment providing a sustained-release material for stabilizing and treating barium slag and the embodiment 1 is that the used sulfate is calcium sulfate.
The preparation method of the sustained-release material for stably treating the barium slag comprises the following steps: and mixing 60g of calcium sulfate and 30g of magnesium-aluminum hydrotalcite uniformly.
The application method of the sustained-release material for stabilizing and treating the barium slag comprises the following specific steps:
preparing a sample: taking barium slag, and measuring the water content of the air-dried barium slag by adopting a drying-gravimetric method; simultaneously obtaining the stabilized treated barium slag to obtain a slow-release material; in this example, barium slag was obtained by using the composition ratios described in table 1.
Treatment: adding a slow-release material into the barium slag to ensure that the molar concentration of sulfate radicals in the barium slag after the slow-release material is added is 1.4 times of the molar concentration of barium ions, uniformly mixing the added slow-release material, adding a proper amount of water according to the water content of the air-dried barium slag determined in the sample preparation step to ensure that the water content of the mixed barium slag is kept at about 30 percent, namely adding about 10g of water into every 100g of barium slag, and uniformly stirring; finally standing for 5 days to realize the treatment of the barium residue.
Example 4
The only difference between the embodiment providing a sustained-release material for stably treating barium slag and the embodiment 3 is that the used hydrotalcite is rare earth hydrotalcite with the product number of JH-59.
The preparation method of the sustained-release material for stably treating the barium slag comprises the following steps: and mixing 60g of calcium sulfate and 30g of rare earth hydrotalcite uniformly.
The application method of the sustained-release material for stabilizing and treating the barium slag comprises the following specific steps:
preparing a sample: taking barium slag, and measuring the water content of the air-dried barium slag by adopting a drying-gravimetric method; simultaneously obtaining the stabilized treated barium slag to obtain a slow-release material; in this example, barium slag was obtained by using the composition ratios described in table 1.
Treatment: adding a slow-release material into the barium slag to ensure that the molar concentration of sulfate radicals in the barium slag after the slow-release material is added is 1.4 times of the molar concentration of barium ions, uniformly mixing the added slow-release material, adding a proper amount of water according to the water content of the air-dried barium slag determined in the sample preparation step to ensure that the water content of the mixed barium slag is kept at about 30 percent, namely adding about 10g of water into every 100g of barium slag, and uniformly stirring; finally standing for 5 days to realize the treatment of the barium residue.
Example 5
The only difference between the embodiment providing a sustained-release material for stably treating barium slag and the embodiment 3 is that the used hydrotalcite is calcium magnesium zinc aluminum hydrotalcite with the model of Jinheng F7.
The preparation method of the sustained-release material for stably treating the barium slag comprises the following steps: and mixing 60g of calcium sulfate and 30g of calcium-magnesium-zinc-aluminum hydrotalcite uniformly.
The application method of the sustained-release material for stabilizing and treating the barium slag comprises the following specific steps:
preparing a sample: taking barium slag, and measuring the water content of the air-dried barium slag by adopting a drying-gravimetric method; simultaneously obtaining the stabilized treated barium slag to obtain a slow-release material; in this example, barium slag was obtained by using the composition ratios described in table 1.
Treatment: adding a slow-release material into the barium slag to ensure that the molar concentration of sulfate radicals in the barium slag after the slow-release material is added is 1.4 times of the molar concentration of barium ions, uniformly mixing the added slow-release material, adding a proper amount of water according to the water content of the air-dried barium slag determined in the sample preparation step to ensure that the water content of the mixed barium slag is kept at about 30 percent, namely adding about 10g of water into every 100g of barium slag, and uniformly stirring; finally standing for 5 days to realize the treatment of the barium residue.
Example 6
The only difference between the embodiment providing a sustained-release material for stabilizing and treating barium slag and the embodiment 3 is that the hydrotalcite used is calcium-zinc-aluminum hydrotalcite with the trade name of Jinheng F9.
The preparation method of the sustained-release material for stably treating the barium slag comprises the following steps: and mixing 60g of calcium sulfate and 30g of calcium-zinc-aluminum hydrotalcite uniformly.
The application method of the sustained-release material for stabilizing and treating the barium slag comprises the following specific steps:
preparing a sample: taking barium slag, and measuring the water content of the air-dried barium slag by adopting a drying-gravimetric method; simultaneously obtaining the stabilized treated barium slag to obtain a slow-release material; in this example, barium slag was obtained by using the composition ratios described in table 1.
Treatment: adding a slow-release material into the barium slag to ensure that the molar concentration of sulfate radicals in the barium slag after the slow-release material is added is 1.4 times of the molar concentration of barium ions, uniformly mixing the added slow-release material, adding a proper amount of water according to the water content of the air-dried barium slag determined in the sample preparation step to ensure that the water content of the mixed barium slag is kept at about 30 percent, namely adding about 10g of water into every 100g of barium slag, and uniformly stirring; finally standing for 5 days to realize the treatment of the barium residue.
Example 7
The embodiment provides a sustained-release material for stably treating barium slag, which comprises the following raw materials:
60g of calcium sulfate solution, 30g of calcium-zinc-aluminum hydrotalcite with the trade name of Jinheng F9 and 15g of filling auxiliary materials; the filling auxiliary material is kaolin.
The preparation method of the sustained-release material for stably treating the barium slag comprises the following steps: and uniformly mixing 60g of calcium sulfate, 30g of calcium-zinc-aluminum hydrotalcite and 15g of filling auxiliary materials.
The application method of the sustained-release material for stabilizing and treating the barium slag comprises the following specific steps:
preparing a sample: taking barium slag, and measuring the water content of the air-dried barium slag by adopting a drying-gravimetric method; simultaneously obtaining the stabilized treated barium slag to obtain a slow-release material; in this example, barium slag was obtained by using the composition ratios described in table 1.
Treatment: adding a slow-release material into the barium slag, so that the molar total amount of sulfate radicals in the added slow-release material is 1.4 times of the molar total amount of barium ions in the barium slag, uniformly mixing the added slow-release material after adding the slow-release material, then adding a proper amount of water according to the water content of the air-dried barium slag measured in the sample preparation step, so that the water content of the mixed barium slag is kept at about 30 percent, namely adding about 10g of water into every 100g of barium slag, and uniformly stirring; finally standing for 5 days to realize the treatment of the barium residue.
Example 8
The embodiment provides a sustained-release material for stably treating barium slag, which comprises the following raw materials:
60g of calcium sulfate solution, 30g of calcium-zinc-aluminum hydrotalcite with the trade name of Jinheng F9 and 12g of filling auxiliary materials; the filling auxiliary material is sepiolite.
The preparation method of the sustained-release material for stably treating the barium slag comprises the following steps: and uniformly mixing 60g of calcium sulfate, 30g of calcium-zinc-aluminum hydrotalcite and 12g of filling auxiliary materials.
The application method of the sustained-release material for stabilizing and treating the barium slag comprises the following specific steps:
preparing a sample: taking barium slag, and measuring the water content of the air-dried barium slag by adopting a drying-gravimetric method; simultaneously obtaining the stabilized treated barium slag to obtain a slow-release material; in this example, barium slag was obtained by using the composition ratios described in table 1.
Treatment: adding a slow-release material into the barium slag, so that the molar total amount of sulfate radicals in the added slow-release material is 1.4 times of the molar total amount of barium ions in the barium slag, uniformly mixing the added slow-release material after adding the slow-release material, then adding a proper amount of water according to the water content of the air-dried barium slag measured in the sample preparation step, so that the water content of the mixed barium slag is kept at about 30 percent, namely adding about 10g of water into every 100g of barium slag, and uniformly stirring; finally standing for 5 days to realize the treatment of the barium residue.
Example 9
The embodiment provides a sustained-release material for stably treating barium slag, which comprises the following raw materials:
60g of calcium sulfate solution, 30g of calcium-zinc-aluminum hydrotalcite with the trade name of Jinheng F9 and 12g of filling auxiliary materials; the filling auxiliary material is bentonite.
The preparation method of the sustained-release material for stably treating the barium slag comprises the following steps: and uniformly mixing 60g of calcium sulfate, 30g of calcium-zinc-aluminum hydrotalcite and 12g of filling auxiliary materials.
The application method of the sustained-release material for stabilizing and treating the barium slag comprises the following specific steps:
preparing a sample: taking barium slag, and measuring the water content of the air-dried barium slag by adopting a drying-gravimetric method; simultaneously obtaining the stabilized treated barium slag to obtain a slow-release material; in this example, barium slag was obtained by using the composition ratios described in table 1.
Treatment: adding a slow-release material into the barium slag, so that the molar total amount of sulfate radicals in the added slow-release material is 1.4 times of the molar total amount of barium ions in the barium slag, uniformly mixing the added slow-release material after adding the slow-release material, then adding a proper amount of water according to the water content of the air-dried barium slag measured in the sample preparation step, so that the water content of the mixed barium slag is kept at about 30 percent, namely adding about 10g of water into every 100g of barium slag, and uniformly stirring; finally standing for 5 days to realize the treatment of the barium residue.
Example 10
The embodiment provides a sustained-release material for stably treating barium slag, which comprises the following raw materials:
60g of calcium sulfate solution, 30g of calcium-zinc-aluminum hydrotalcite with the trade name of Jinheng F9 and 12g of filling auxiliary materials; the filling auxiliary material is cement.
The preparation method of the sustained-release material for stably treating the barium slag comprises the following steps: and uniformly mixing 60g of calcium sulfate, 30g of calcium-zinc-aluminum hydrotalcite and 12g of filling auxiliary materials.
The application method of the sustained-release material for stabilizing and treating the barium slag comprises the following specific steps:
preparing a sample: taking barium slag, and measuring the water content of the air-dried barium slag by adopting a drying-gravimetric method; simultaneously obtaining the stabilized treated barium slag to obtain a slow-release material; in this example, barium slag was obtained by using the composition ratios described in table 1.
Treatment: adding a slow-release material into the barium slag, so that the molar total amount of sulfate radicals in the added slow-release material is 1.4 times of the molar total amount of barium ions in the barium slag, uniformly mixing the added slow-release material after adding the slow-release material, then adding a proper amount of water according to the water content of the air-dried barium slag measured in the sample preparation step, so that the water content of the mixed barium slag is kept at about 30 percent, namely adding about 10g of water into every 100g of barium slag, and uniformly stirring; finally standing for 5 days to realize the treatment of the barium residue.
Comparative example 1
The embodiment provides a sustained-release material for stably treating barium slag, which comprises the following raw materials:
80g of sodium sulfate and 20g of magnesium aluminum hydrotalcite with the model of HT-22.
The preparation method of the sustained-release material for stably treating the barium slag comprises the following steps: and mixing 80g of sodium sulfate and 20g of magnesium aluminum hydrotalcite uniformly.
The application method of the sustained-release material for stabilizing and treating the barium slag comprises the following specific steps:
preparing a sample: taking barium slag, and measuring the water content of the air-dried barium slag by adopting a drying-gravimetric method; simultaneously obtaining the stabilized treated barium slag to obtain a slow-release material; in this example, barium slag was obtained by using the composition ratios described in table 1.
Treatment: adding a slow-release material into the barium slag to ensure that the molar concentration of sulfate radicals in the barium slag after the slow-release material is added is 1.4 times of the molar concentration of barium ions, uniformly mixing the added slow-release material, adding a proper amount of water according to the water content of the air-dried barium slag determined in the sample preparation step to ensure that the water content of the mixed barium slag is kept at about 30 percent, namely adding about 10g of water into every 100g of barium slag, and uniformly stirring; finally standing for 5 days to realize the treatment of the barium residue.
Comparative example 2
The only difference between the embodiment that a sustained-release material for stabilizing and treating barium slag is provided in the embodiment 1 is that magnesium aluminum hydrotalcite is not added.
The application method of the sustained-release material for stabilizing and treating the barium slag comprises the following specific steps:
preparing a sample: taking barium slag, and measuring the water content of the air-dried barium slag by adopting a drying-gravimetric method; simultaneously obtaining the stabilized treated barium slag to obtain a slow-release material; in this example, barium slag was obtained by using the composition ratios described in table 1.
Treatment: adding a slow-release material into the barium slag to ensure that the molar concentration of sulfate radicals in the barium slag after the slow-release material is added is 1.4 times of the molar concentration of barium ions, uniformly mixing the added slow-release material, adding a proper amount of water according to the water content of the air-dried barium slag determined in the sample preparation step to ensure that the water content of the mixed barium slag is kept at about 30 percent, namely adding about 10g of water into every 100g of barium slag, and uniformly stirring; finally standing for 5 days to realize the treatment of the barium residue.
Test example 1
The barium residues used in examples 1 to 10 and comparative examples 1 to 2 were uniformly sampled, a leaching test was performed according to the method of J/T299-2007 (solid waste leaching toxicity leaching method, nitric sulfate method), and the original leaching concentration of barium before the barium residues were not treated was found to be 1944 mg/L; then, the slow release materials in the examples 1-9 and the comparative examples 1-2 are prepared according to the proportion of each example, then the application method of the slow release materials in the examples 1-9 and the comparative examples 1-2 is adopted to treat the barium slag, the treated barium slag is taken to carry out a leaching test according to the method of J/T299-2007 (solid waste leaching toxicity leaching method, sulfuric acid and nitric acid method), and the leaching concentration of barium is detected; filtering and taking the percolate after treatment, testing the concentration of sulfate ions in the percolate according to an EDTA complexation titration method, wherein the test result is shown in Table 2:
TABLE 2 barium leaching concentration of treated barium residue and sulfate ion concentration in leachate
It can be seen from table 2 that if only sulfate is used in the treatment of barium slag, the concentration of sulfate ions in the barium slag leachate after treatment is significantly higher, and the concentration of sulfate ions in the leachate is significantly reduced after the anion-adsorbing material is added. Especially, the concentration of sulfate ions in the leachate can be further remarkably reduced by matching the calcium sulfate with the anion adsorbing material, wherein the concentration of the sulfate ions in the leachate can be effectively reduced by matching the calcium sulfate with calcium-zinc-aluminum hydrotalcite or magnesium-aluminum hydrotalcite, and the like, and the effect of further reducing the concentration of the barium ions is achieved, so that the hydrotalcite of the kind has a synergistic effect when matched with the calcium sulfate, and the effect is obvious.
Test example 2
The slow release materials of the embodiments 6 to 10 are prepared according to the proportion of each embodiment, then the barium slag is treated according to the application method of the slow release materials in the embodiments 6 to 10, the treated barium slag is filled into a leaching column with the diameter of 5cm and the height of 40cm for soil dialysis experiments, the filling height is 20cm, the compaction degree is 0.9, then clear water is poured into the leaching column filled with the barium slag by using a peristaltic pump, the leaching rate is 30mL/min, the erosion process of precipitation on slag bodies under natural conditions is simulated, a container with scales is used for receiving leaching liquid below, the outflow speed of the leaching liquid is recorded, and the sulfate ion concentration in the leaching liquid is tested according to an EDTA complex titration method, and the test results are shown in Table 3:
TABLE 3 sulfate ion concentration in leachate after treatment of barium residue
As can be seen from table 3, when the sustained-release material with the added filling auxiliary material is used to treat the barium slag, the concentration of sulfate ions in the leacheate of the treated barium slag is obviously lower than that of the leacheate of the barium slag treated by the sustained-release material without the added filling auxiliary material, which indicates that the added filling auxiliary material can effectively reduce the migration characteristic of the leachate of the treated barium slag, reduce the possibility that the leachate of the treated barium slag is generated in a landfill, and effectively slow down the overflow of the leachate.
The barium slag used in the barium slag test of the present invention was thoroughly mixed, and the heterogeneity was not reflected in the present invention. However, in practical application, the phenomenon of relative overdose caused by heterogeneity is more obvious, namely the slow release effect is more obvious.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. A sustained-release material for stably treating barium slag is characterized by comprising sulfate and an anion adsorption material.
2. The slow-release material for stabilizing and treating barium slag according to claim 1, wherein the weight ratio of the sulfate to the anion adsorbing material is (1-2): 1.
3. the slow-release material for stabilizing and treating barium slag according to claim 1 or 2, wherein the anion adsorbing material is hydrotalcite.
4. The slow-release material for stabilizing and treating barium slag according to claim 3, wherein the hydrotalcite is a two-to-three-element hydrotalcite, preferably a calcium magnesium zinc aluminum hydrotalcite and/or a magnesium aluminum hydrotalcite.
5. The slow release material for stabilizing and treating barium slag according to any one of claims 1 to 4, wherein the sulfate is selected from one or more of sodium sulfate, ammonium sulfate, ferric sulfate, ferrous sulfate, alum and calcium sulfate.
6. The slow release material for stabilizing and treating barium slag according to any one of claims 1 to 5, further comprising a filling auxiliary material for reducing porosity.
7. The slow-release material for stabilizing and treating barium slag according to any one of claims 6, wherein the filling auxiliary material comprises clay mineral and/or cement.
8. The slow-release material for the stable treatment of the barium residues according to claim 6 or 7, wherein the weight ratio of the filling auxiliary materials to the sulfate is 1: (4-5).
9. A method for stabilizing and treating barium slag is characterized by comprising the following steps:
preparing a sample: preparing a slow release material for stabilizing and treating barium slag according to any one of claims 1 to 8;
treatment: and adding the slow-release material and water into the barium residues, uniformly stirring, and standing.
10. The method for stabilizing and treating barium slag according to claim 9, wherein after the slow release material is added, the molar concentration of sulfate radicals is 1-1.4 times of the highest value, and the content of water after the addition is 30-40 wt%, based on the highest value of the molar concentration of barium ions in barium slag at different positions.
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