CN115340390A - Preparation method of red mud-based non-fired high-strength clay brick alkali inhibitor - Google Patents
Preparation method of red mud-based non-fired high-strength clay brick alkali inhibitor Download PDFInfo
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- CN115340390A CN115340390A CN202210826729.9A CN202210826729A CN115340390A CN 115340390 A CN115340390 A CN 115340390A CN 202210826729 A CN202210826729 A CN 202210826729A CN 115340390 A CN115340390 A CN 115340390A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63488—Polyethers, e.g. alkylphenol polyglycolether, polyethylene glycol [PEG], polyethylene oxide [PEO]
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- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Treatment Of Sludge (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a preparation method of an alkali-inhibiting agent for a red mud-based unfired high-strength clay brick, which comprises the following steps: 1. adding stearic acid, alkali metal hydroxide and alkali metal carbonate into water at the temperature of 60-80 ℃, and uniformly stirring to obtain a solution A; 2. adding acrylic acid, sodium allylsulfonate, acrylamide and a chain transfer agent into water, and uniformly stirring to obtain a solution B; 3. adding acrylic acid, polyether macromonomer and initiator into water, and stirring until the acrylic acid, polyether macromonomer and initiator are completely dissolved to obtain solution C; 4. heating the solution C to 60-80 ℃ under the stirring state, simultaneously dripping the solution A and the solution B into the solution C, finishing dripping the solution A for three hours, finishing dripping the solution B for three and a half hours, then preserving heat for one hour, and cooling to obtain the red mud-based baking-free high-strength clay brick alkali inhibitor.
Description
Technical Field
The invention relates to the technical field of building materials and auxiliaries, in particular to a preparation method of an alkali inhibitor for red mud-based non-fired high-strength clay bricks.
Background
The red mud is strong alkaline waste generated in the production process of alumina, and 0.8-2.5 t of red mud is generated every 1 t of alumina according to different processing techniques and raw materials. The red mud has high yield and strong alkalinity, and is difficult to comprehensively utilize. A large amount of alkali is separated out in the use process of the building material produced by utilizing the red mud, which is commonly called as the phenomenon of alkali return. For large-scale use of red mud, the existing method mainly reduces the alkali content in the red mud, namely, the dealkalization method is used for treating the red mud. The red mud dealkalization method comprises a plurality of main washing methods, a lime method, a salt leaching method, a membrane dealkalization technology and the like, but the red mud has complex components and various existing forms of alkali, so that the dealkalization process is complex, the investment is high, and secondary pollution is easy to cause, so that the problems of economy, periodicity, secondary pollution and the like of the red mud dealkalization hinder the large-scale application of the red mud dealkalization method, the dealkalization problem of the red mud is still the problem of the current research, and the problems of alkali return and alkali precipitation of the red mud-based building materials cannot be fundamentally solved.
The problem of alkali return and alkali precipitation also exists after the red mud-based baking-free high-strength clay brick is formed. In order to solve the problem, the invention provides a preparation method of an alkali inhibitor, which is used for inhibiting alkali precipitation in the preparation process of the red mud-based non-fired high-strength clay brick.
Disclosure of Invention
In order to solve the problems, the invention provides a preparation method of the alkali inhibitor for the red mud-based non-fired high-strength clay brick, which can obviously inhibit the precipitation of alkali in the red mud and solve the problem of alkali return of the red mud-based non-fired high-strength clay.
The invention is realized by the following technical scheme:
a preparation method of an alkali-inhibiting agent for a red mud-based unfired high-strength clay brick mainly comprises the following steps:
step one, preparing a solution A: adding stearic acid, alkali metal hydroxide and alkali metal carbonate into water at the temperature of 60-80 ℃, and uniformly stirring to obtain a solution A;
step two, preparing a solution B: adding acrylic acid, sodium allylsulfonate, acrylamide and a chain transfer agent into water, and uniformly stirring to obtain a solution B;
step three, preparing a solution C: adding acrylic acid, polyether macromonomer and initiator into water, and stirring until the acrylic acid, polyether macromonomer and initiator are completely dissolved to obtain solution C;
step four, preparing an alkali inhibitor: and heating the solution C to 60-80 ℃ under the stirring state, simultaneously dropwise adding the solution A and the solution B into the solution C, dropwise adding the solution A for three hours, dropwise adding the solution B for three and half hours, then preserving heat for one hour, and cooling to obtain the red mud-based baking-free high-strength clay brick alkali inhibitor.
Furthermore, the dosage of stearic acid in the solution A is 5-8 g, the dosage of alkali metal hydroxide is 0.5-1 g, and the dosage of alkali metal carbonate is 0.2-0.5 g.
Furthermore, the dosage of the acrylic acid in the solution B is 5-10, the dosage of the acrylamide is 0-5 g, and the dosage of the sodium allylsulfonate is 1-3 g.
Furthermore, the dosage of the acrylic acid in the solution C is 10-20 g, the dosage of the polyether macromonomer is 25-40 g, and the dosage of the initiator is 0.2-1 g.
Further, the initiator is one or two of ammonium persulfate, hydrogen peroxide and potassium persulfate.
Further, the polyether macromonomer is one of allyl polyoxyethylene ether, prenol polyoxyethylene ether and vinyl polyether macromonomer.
Further, the chain transfer agent is mercaptopropionic acid.
The invention has the beneficial effects that:
1. the preparation method is simple to use, avoids a complex dealkalization process, and can effectively prevent and control the problem of alkali return by directly adding the prepared alkali inhibitor when producing the red mud-based non-fired high-strength clay brick;
2. the use of the alkali inhibitor can realize the full resource utilization of the red mud;
3. the alkali inhibitor prepared by the invention can obviously inhibit the precipitation of alkali in the red mud and simultaneously solve the problem of alkali return of the red mud-based non-fired high-strength clay;
4. the alkali inhibitor prepared by the invention blocks a mass transfer channel of soluble alkali in the red mud in use, can be added according to a certain proportion when producing the red mud-based baking-free high-strength clay brick, can completely solve the problem of alkali return of the product, and can obviously inhibit the precipitation of the soluble alkali in the red mud by testing the PH value of the water solution soaked in the clay brick.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below.
Example 1:
a preparation method of an alkali-inhibiting agent for a red mud-based unfired high-strength clay brick mainly comprises the following steps:
preparing a solution A: adding stearic acid 5 g, alkali metal hydroxide 0.5 g and alkali metal carbonate 0.3 g into water, and heating to 70 deg.C;
preparing a solution B: 5 g of acrylic acid, 1 g of acrylamide and 1.5 g of sodium allylsulfonate are added into certain water for later use;
preparing a solution C: the amount of acrylic acid is 10 g, the amount of polyether macromonomer is 25 g, and the amount of initiator is 0.35 g, which are added into a certain amount of water.
Preparing an alkali inhibitor: and heating the solution C to 60-80 ℃ under the stirring state, simultaneously dropwise adding the solution A and the solution B into the solution C, dropwise adding the solution A for three hours, dropwise adding the solution B for three and half hours, then preserving heat for one hour, and cooling to obtain the red mud-based baking-free high-strength clay brick alkali-inhibiting agent.
Example 2
A preparation method of an alkali-inhibiting agent for a red mud-based unfired high-strength clay brick mainly comprises the following steps:
preparing a solution A: adding 8 g of stearic acid, 0.8 g of alkali metal hydroxide and 0.5 g of alkali metal carbonate into water, and heating to 70 ℃ for later use;
preparing a solution B: the dosage of the acrylic acid is 10 g, the dosage of the acrylamide is 3 g, and the dosage of the sodium allylsulfonate is 2.5 g, and the acrylic acid and the acrylamide are added into a certain amount of water for standby;
preparing a solution C: adding 15 g of acrylic acid, 40 g of polyether macromonomer and 0.5 g of initiator into certain water for later use;
preparing an alkali inhibitor: and heating the solution C to 60-80 ℃ under the stirring state, simultaneously dropwise adding the solution A and the solution B into the solution C, dropwise adding the solution A for three hours, dropwise adding the solution B for three and half hours, then preserving heat for one hour, and cooling to obtain the red mud-based baking-free high-strength clay brick alkali-inhibiting agent.
The initiator used in the above embodiment is one or two of ammonium persulfate, hydrogen peroxide and potassium persulfate, the polyether macromonomer is one of allyl polyoxyethylene ether, prenol polyoxyethylene ether and vinyl polyether macromonomer, and the chain transfer agent is mercaptopropionic acid.
The use effect of the red mud-based non-fired high-strength clay brick alkali inhibitor prepared in the embodiment in preparing clay bricks is as follows:
as can be seen from the table, the pH value of the soaking water solution of the clay brick prepared by using the alkali-inhibiting agent is obviously reduced, and the precipitation of soluble alkali in the red mud is effectively inhibited.
While there have been shown and described what are at present considered to be the basic principles, essential features and advantages of the present invention, it will be understood by those skilled in the art that the present invention is not limited by the foregoing embodiments, which are merely illustrative of the principles of the present invention, but various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (7)
1. A preparation method of a red mud-based baking-free high-strength clay brick alkali inhibitor is characterized by comprising the following steps: the method mainly comprises the following steps:
step one, preparing a solution A: adding stearic acid, alkali metal hydroxide and alkali metal carbonate into water at the temperature of 60-80 ℃, and uniformly stirring to obtain a solution A;
step two, preparing a solution B: adding acrylic acid, sodium allylsulfonate, acrylamide and a chain transfer agent into water, and uniformly stirring to obtain a solution B;
step three, preparing a solution C: adding acrylic acid, polyether macromonomer and initiator into water, and stirring until the acrylic acid, polyether macromonomer and initiator are completely dissolved to obtain solution C;
step four, preparing an alkali inhibitor: and heating the solution C to 60-80 ℃ under the stirring state, simultaneously dropwise adding the solution A and the solution B into the solution C, dropwise adding the solution A for three hours, dropwise adding the solution B for three and half hours, then preserving heat for one hour, and cooling to obtain the red mud-based baking-free high-strength clay brick alkali inhibitor.
2. The preparation method of the red mud-based non-fired high-strength clay brick alkali-inhibiting agent according to claim 1, which is characterized by comprising the following steps: the dosage of stearic acid in the solution A is 5-8 g, the dosage of alkali metal hydroxide is 0.5-1 g, and the dosage of alkali metal carbonate is 0.2-0.5 g.
3. The preparation method of the red mud-based non-fired high-strength clay brick alkali-inhibiting agent according to claim 1, which is characterized by comprising the following steps: the dosage of the acrylic acid in the solution B is 5-10 g, the dosage of the acrylamide is 0-5 g, and the dosage of the sodium allylsulfonate is 1-3 g.
4. The preparation method of the red mud-based non-fired high-strength clay brick alkali-inhibiting agent according to claim 1, which is characterized by comprising the following steps: the dosage of the acrylic acid in the solution C is 10-20 g, the dosage of the polyether macromonomer is 25-40 g, and the dosage of the initiator is 0.2-1 g.
5. The preparation method of the red mud-based unfired high-strength clay brick alkali-inhibiting agent according to claim 1 or 4, which is characterized by comprising the following steps: the initiator is one or two of ammonium persulfate, hydrogen peroxide and potassium persulfate.
6. The preparation method of the red mud-based unfired high-strength clay brick alkali-inhibiting agent according to claim 1 or 4, which is characterized by comprising the following steps: the polyether macromonomer is one of allyl polyoxyethylene ether, isopentenol polyoxyethylene ether and vinyl polyether macromonomer.
7. The preparation method of the red mud-based non-fired high-strength clay brick alkali-inhibiting agent according to claim 1, which is characterized by comprising the following steps: the chain transfer agent is mercaptopropionic acid.
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