Environment-friendly magnesium-calcium ramming material and preparation method thereof

Abstract

The invention relates to an environment-friendly magnesium-calcium ramming material and a preparation method thereof. The environment-friendly magnesium-calcium ramming material comprises the following components in parts by weight: 60-80 parts of waste magnesium-calcium brick particles; 20-30 parts of waste magnesite brick particles; 30 to 50 parts of magnesium calcium sand; 60-80 parts of a binding agent; 15-20 parts of tung oil; 10 to 15 parts of alumina; 10 to 15 parts of bentonite; and 8-12 parts of silica powder. The preparation method comprises the following steps: 1) weighing and proportioning according to the proportion, adding the waste magnesia-calcium brick particles, the waste magnesia brick particles and the magnesia-calcium sand into a stirrer, and uniformly stirring; 2) adding alumina, silica powder and a binding agent into the stirrer, and continuously stirring uniformly; (3) adding bentonite into the mixture obtained in the step (2), and uniformly stirring; and 4) finally adding the tung oil into the stirrer, and continuously stirring uniformly. The ramming material is prepared from waste refractory materials, so that the problem of environmental pollution caused by accumulation of the waste refractory materials is solved; the bentonite and the tung oil are adopted to prepare the ramming material, the tung oil is adsorbed on the bentonite, a composite waterproof agent is formed, and the hydration phenomenon of the ramming material can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of refractory materials, and in particular to an environmentally friendly magnesium-calcium ramming material and a preparation method thereof. Background Art

[0002] Ramming mass is widely used in metallurgy, petrochemical, coal coke chemical, building materials, cement and other industries. It is used to fill the gap between the furnace cooling equipment and the masonry or the masonry leveling layer. Ramming mass is classified by material: high alumina, clay, magnesium calcium, dolomite, zirconium and silicon carbide-carbon refractory ramming mass.

[0003] Among them, magnesium-calcium ramming materials have high hardness, certain crystal structure, good fire retardant performance, acid and alkali resistance and mechanical properties. However, magnesium-calcium ramming materials produced by existing technology are easy to hydrate. During storage and use, they easily absorb moisture in the air to undergo hydration reaction. This hydration reaction is accompanied by hydration weight gain and volume expansion, which seriously affects the service life.

[0004] In addition, with the rapid development of industrialization and the over-exploitation of mineral resources, high-quality mineral resources are becoming increasingly scarce. At the same time, the discarded refractory materials removed from the major and medium repairs and reconstructions of furnaces, kilns, ladles, iron ladles and other intermediate ladles not only pollute the environment, but are also time-consuming, labor-intensive and require a lot of effort to dispose of.

[0005] In view of this, it is necessary to propose an environmentally friendly magnesium-calcium ramming mass and a preparation method thereof to improve the hydration phenomenon of the magnesium-calcium ramming mass and solve the problem of environmental pollution caused by the accumulation of waste refractory materials. Summary of the invention

[0006] In order to overcome the defects of the prior art, the technical problem solved by the present invention is to provide an environmentally friendly magnesium-calcium ramming mass and a preparation method thereof. The present invention uses waste refractory materials to prepare the ramming mass, thereby solving the problem of environmental pollution caused by the accumulation of waste refractory materials; and uses bentonite and tung oil to prepare the ramming mass, and the tung oil is adsorbed on the bentonite to form a composite waterproofing agent, which can improve the hydration phenomenon of the ramming mass.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An environmentally friendly magnesium-calcium ramming material comprises the following components in parts by weight:

[0009] 60-80 parts of waste magnesia-lime brick particles;

[0010] 20-30 parts of waste magnesia brick particles;

[0011] 30-50 parts of magnesium calcium sand;

[0012]

[0013] In the waste magnesia-lime bricks, MgO>65%, CaO>25%; the particle composition of the waste magnesia-lime bricks is: 1mm<particle size≤3mm, 0.088mm<particle size≤1mm, particle size≤0.088mm, and the weight proportion of the three particle sizes is 1:2:1.5.

[0014] The waste magnesia bricks contain MgO≥85%; and the particles of the waste magnesia bricks are ≤0.088 mm.

[0015] The CaO content in the magnesia-calcium sand is 20% to 25%; the particle composition in the magnesia-calcium sand is: 1mm<particle size≤3mm, 0.088mm<particle size≤1mm, particle size≤0.088mm, and the weight proportion of the three particle sizes is 1:2:2.

[0016] The binder comprises one or more components of high alumina cement, aluminum dihydrogen phosphate, starch or water glass.

[0017] The particle size of the silicon micropowder is 0.074 mm; the particle size of the bentonite is 0.074 mm.

[0018] A method for preparing an environmentally friendly magnesium-calcium ramming material, the specific steps are as follows:

[0019] 1) Weigh the ingredients according to the above ratio, add the waste magnesia-lime brick particles, waste magnesia brick particles and magnesia-lime sand into a mixer, and stir evenly;

[0020] 2) Then add alumina, silicon powder and binder into the mixer and continue to stir evenly;

[0021] 3) Add bentonite to step 2) and stir evenly;

[0022] 4) Finally, add tung oil into the blender and continue to blend evenly.

[0023] In the step 4), the temperature during the addition of tung oil and stirring is controlled at 20-40°C.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention utilizes waste refractory materials to prepare ramming materials, thereby solving the problem of environmental pollution caused by accumulation of waste refractory materials and being environmentally friendly; bentonite and tung oil are used to prepare the ramming materials, and the tung oil is adsorbed on the bentonite to form a composite waterproofing agent, which can improve the hydration phenomenon of the ramming materials; in addition, the temperature of the tung oil during stirring is controlled at 20-40° C., the fluidity is good, the tung oil is better mixed with the material, and can be more evenly adsorbed on the bentonite. DETAILED DESCRIPTION

[0026] The specific implementation mode of the present invention is further described below:

[0027] Example 1

[0028] The present invention relates to an environmentally friendly magnesium-calcium ramming material, comprising the following components in parts by weight:

[0029]

[0030]

[0031] In the waste magnesia-lime bricks, MgO>65%, CaO>25%; the particle composition of the waste magnesia-lime bricks is: 1mm<particle size≤3mm, 0.088mm<particle size≤1mm, particle size≤0.088mm, and the weight proportion of the three particle sizes is 1:2:1.5.

[0032] The waste magnesia bricks contain MgO≥85%; and the particles of the waste magnesia bricks are ≤0.088 mm.

[0033] The CaO content in the magnesia-calcium sand is 20% to 25%; the particle composition in the magnesia-calcium sand is: 1mm<particle size≤3mm, 0.088mm<particle size≤1mm, particle size≤0.088mm, and the weight proportion of the three particle sizes is 1:2:2.

[0034] The binder comprises one or more components of high alumina cement, aluminum dihydrogen phosphate, starch or water glass.

[0035] The particle size of the silicon micropowder is 0.074 mm; the particle size of the bentonite is 0.074 mm.

[0036] A method for preparing an environmentally friendly magnesium-calcium ramming material, the specific steps are as follows:

[0037] 1) Weigh the ingredients according to the above ratio, add the waste magnesia-lime brick particles, waste magnesia brick particles and magnesia-lime sand into a mixer, and stir evenly;

[0038] 2) Then add alumina, silicon powder and binder into the mixer and continue to stir evenly;

[0039] 3) Add bentonite to step 2) and stir evenly;

[0040] 4) Finally, add tung oil into the blender and continue to blend evenly.

[0041] In the step 4), the temperature during the addition of tung oil and stirring is controlled at 30°C.

[0042] Example 2

[0043] The present invention relates to an environmentally friendly magnesium-calcium ramming material, comprising the following components in parts by weight:

[0044]

[0045] In the waste magnesia-lime bricks, MgO>65%, CaO>25%; the particle composition of the waste magnesia-lime bricks is: 1mm<particle size≤3mm, 0.088mm<particle size≤1mm, particle size≤0.088mm, and the weight proportion of the three particle sizes is 1:2:1.5.

[0046] The waste magnesia bricks contain MgO≥85%; and the particles of the waste magnesia bricks are ≤0.088 mm.

[0047] The CaO content in the magnesia-calcium sand is 20% to 25%; the particle composition in the magnesia-calcium sand is: 1mm<particle size≤3mm, 0.088mm<particle size≤1mm, particle size≤0.088mm, and the weight proportion of the three particle sizes is 1:2:2.

[0048] The binder comprises one or more components of high alumina cement, aluminum dihydrogen phosphate, starch or water glass.

[0049] The particle size of the silicon micropowder is 0.074 mm; the particle size of the bentonite is 0.074 mm.

[0050] A method for preparing an environmentally friendly magnesium-calcium ramming material, the specific steps are as follows:

[0051] 1) Weigh the ingredients according to the above ratio, add the waste magnesia-lime brick particles, waste magnesia brick particles and magnesia-lime sand into a mixer, and stir evenly;

[0052] 2) Then add alumina, silicon powder and binder into the mixer and continue to stir evenly;

[0053] 3) Add bentonite to step 2) and stir evenly;

[0054] 4) Finally, add tung oil into the blender and continue to blend evenly.

[0055] In the step 4), the temperature during the addition of tung oil and stirring is controlled at 25°C.

[0056] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. In addition, the various different embodiments of the present invention can also be arbitrarily combined, as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An environmentally friendly magnesium-calcium ramming material, characterized in that: Contains the following components in parts by weight:

2. An environmentally friendly magnesium-calcium ramming material according to claim 1, characterized in that: In the waste magnesia-lime bricks, MgO>65%, CaO>25%; the particle composition of the waste magnesia-lime bricks is: 1mm<particle size≤3mm, 0.088mm<particle size≤1mm, particle size≤0.088mm, and the weight proportion of the three particle sizes is 1:2:1.

5.

3. An environmentally friendly magnesium-calcium ramming material according to claim 1, characterized in that: The waste magnesia bricks contain MgO≥85%; and the particles of the waste magnesia bricks are ≤0.088 mm.

4. An environmentally friendly magnesium-calcium ramming material according to claim 1, characterized in that: The CaO content in the magnesia-calcium sand is 20% to 25%; the particle composition in the magnesia-calcium sand is: 1mm<particle size≤3mm, 0.088mm<particle size≤1mm, particle size≤0.088mm, and the weight proportion of the three particle sizes is 1:2:

2.

5. An environmentally friendly magnesium-calcium ramming material according to claim 1, characterized in that: The binder comprises one or more components of high alumina cement, aluminum dihydrogen phosphate, starch or water glass.

6. An environmentally friendly magnesium-calcium ramming material according to claim 1, characterized in that: The particle size of the silicon micropowder is 0.074 mm; the particle size of the bentonite is 0.074 mm.

7. A method for preparing an environmentally friendly magnesium-calcium ramming material according to claim 1, characterized in that: The specific steps are as follows: 1) Weigh the ingredients according to the above ratio, add the waste magnesia-lime brick particles, waste magnesia brick particles and magnesia-lime sand into a mixer, and stir evenly; 2) Then add alumina, silicon powder and binder into the mixer and continue to stir evenly; 3) Add bentonite to step 2) and stir evenly; 4) Finally, add tung oil into the blender and continue to blend evenly.

8. The method for preparing an environmentally friendly magnesium-calcium ramming material according to claim 7, characterized in that: In the step 4), the temperature during the addition of tung oil and stirring is controlled at 20-40°C.

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