Environment-friendly ramming material and preparation method thereof

Abstract

The invention relates to an environment-friendly ramming material and a preparation method thereof. The environment-friendly ramming material is prepared from the following raw materials in parts by weight: 70-80 parts of waste silicon carbide brick particles; 50 to 60 parts of special grade alumina; 35 to 40 parts of brown aluminum oxide; 6 to 18 parts of graphite micro powder; 5-15 parts of alumina micro powder; 5 to 12 parts of metal silicon micro powder; 4-8 parts of a composite binder; 2-5 parts of a dispersant; the composite binding agent is prepared from the following raw materials in parts by weight: 35-40 parts of phenolic resin, 20-30 parts of absolute ethyl alcohol, 0.2-1 part of modified white carbon black and 0.03-0.8 part of a formaldehyde catching agent, and the formaldehyde catching agent is a compound containing a primary amine group. The waste silicon carbide brick is used as a basic material of the ramming material, so that the waste of resources and the damage to the environment can be reduced; and the modified phenolic resin of the formaldehyde catching agent is adopted, so that the content of free aldehyde is reduced.

Description

Technical Field

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

[0002] Ramming mass refers to amorphous refractory materials that are constructed by ramming (manual or mechanical) and hardened under heating above normal temperature. Ramming mass is used to fill the gap between the furnace cooling equipment and the masonry or to fill the masonry leveling layer.

[0003] The existing ramming material binders are mostly phenolic resin, coal tar or coal tar. The phenolic resin binder contains harmful substances such as free phenol and free aldehyde. The asphalt emits yellow toxic smoke at high temperature, resulting in poor construction conditions and serious damage to the health of workers.

[0004] In addition, in recent years, with the continued downturn in the steel industry, the pressure on steel companies to reduce costs has increased dramatically, and refractory materials have become an important part of the steel industry to increase costs and efficiency. Many steel companies have a large number of discarded silicon carbide refractory bricks. Discarded refractory bricks will occupy a large amount of land, resulting in a waste of land resources. Moreover, over time, the chemical elements contained in them will be slowly released, which may pollute nearby water sources or groundwater, or directly affect the surrounding ecological environment, causing damage to the ecological environment. Summary of the invention

[0005] In order to overcome the defects of the prior art, the technical problem solved by the present invention is to provide an environmentally friendly ramming material and a preparation method thereof. The present invention utilizes discarded silicon carbide bricks as the basic material of the ramming material, which can reduce the waste of resources and the damage to the environment; and adopts a modified phenolic resin of a formaldehyde scavenger to reduce the content of free formaldehyde.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An environmentally friendly ramming mass, wherein the environmentally friendly ramming mass is made of the following raw materials in parts by weight:

[0008]

[0009]

[0010] The composite binder is made of the following raw materials in parts by weight: 35-40 parts of phenolic resin, 20-30 parts of anhydrous ethanol, 0.2-1 part of modified white carbon black, and 0.03-0.8 part of formaldehyde scavenger, wherein the formaldehyde scavenger is a compound containing a primary amine group.

[0011] The dispersant is one or both of sodium tripolyphosphate and sodium hexametaphosphate.

[0012] The modified white carbon black has a particle size of 7 to 40 nm and a specific surface area of ​​150 to 400 m 2 / g.

[0013] The particle size of the discarded silicon carbide brick particles is ≤0.700mm; the particle size of the special-grade alumina is ≤0.325mm; the particle size of the brown corundum is ≤0.068mm; the particle size of the graphite micropowder is ≤0.03mm fine powder; the particle size of the alumina micropowder is ≤0.025mm; and the particle size of the metallic silicon micropowder is ≤0.025mm.

[0014] A method for preparing an environmentally friendly ramming material, the method comprising the following steps:

[0015] First, the ingredients are weighed and mixed according to the above ratio, and the waste silicon carbide brick particles, special grade alumina, brown corundum, graphite powder, alumina powder and metal silicon powder are evenly mixed to obtain a mixture;

[0016] Then, the composite binder is added into the mixed material and stirred evenly in a mixer;

[0017] Finally, add the dispersant and continue stirring until the material can be kneaded into a ball by hand, and then seal and package it.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) The present invention uses discarded silicon carbide bricks as the basic material of the ramming material, which reduces the accumulation of discarded refractory bricks and also reduces the development and utilization of new resources, which is beneficial to saving costs and reducing damage to the environment.

[0020] 2) The present invention adopts a composite binder, which is a phenolic resin modified by adding a formaldehyde scavenger. The formaldehyde scavenger has a primary amine group, which can effectively reduce the free aldehyde in the system and reduce the generation of harmful substances.

[0021] 3) The ramming material prepared by the present invention, at high temperature, the fibrous silicon carbide generated in situ by silicon powder and carbon material penetrates the gaps of the corundum skeleton structure, fills the pores, blocks the main channel for slag penetration, and is conducive to improving the slag erosion resistance. In addition, the non-oxide content in the material matrix is ​​increased by adding the graphite micropowder raw material, which is conducive to further improving the erosion resistance of the material. DETAILED DESCRIPTION

[0022] The specific implementation mode of the present invention is further described below:

[0023] Example 1

[0024] The environmentally friendly ramming material provided in this embodiment is made of the following raw materials in parts by weight:

[0025]

[0026]

[0027] The composite binder is made of the following raw materials in parts by weight: 35 parts of phenolic resin, 22 parts of anhydrous ethanol, 0.3 parts of modified white carbon black, and 0.04 parts of formaldehyde scavenger, wherein the formaldehyde scavenger is a compound containing a primary amine group.

[0028] The dispersant is one or both of sodium tripolyphosphate and sodium hexametaphosphate.

[0029] The modified white carbon black has a particle size of 7 to 40 nm and a specific surface area of ​​150 to 400 m 2 / g.

[0030] The particle size of the discarded silicon carbide brick particles is ≤0.700mm; the particle size of the special-grade alumina is ≤0.325mm; the particle size of the brown corundum is ≤0.068mm; the particle size of the graphite micropowder is ≤0.03mm fine powder; the particle size of the alumina micropowder is ≤0.025mm; and the particle size of the metallic silicon micropowder is ≤0.025mm.

[0031] A method for preparing an environmentally friendly ramming material, the method comprising the following steps:

[0032] First, the ingredients are weighed and mixed according to the above ratio, and the waste silicon carbide brick particles, special grade alumina, brown corundum, graphite powder, alumina powder and metal silicon powder are evenly mixed to obtain a mixture;

[0033] Then, the composite binder is added into the mixed material and stirred evenly in a mixer;

[0034] Finally, add the dispersant and continue stirring until the material can be kneaded into a ball by hand, and then seal and package it.

[0035] Example 2

[0036] The environmentally friendly ramming material provided in this embodiment is made of the following raw materials in parts by weight:

[0037]

[0038] The composite binder is made of the following raw materials in parts by weight: 38 parts of phenolic resin, 25 parts of anhydrous ethanol, 0.6 parts of modified white carbon black, and 0.3 parts of formaldehyde scavenger, wherein the formaldehyde scavenger is a compound containing a primary amine group.

[0039] The dispersant is one or both of sodium tripolyphosphate and sodium hexametaphosphate.

[0040] The modified white carbon black has a particle size of 7 to 40 nm and a specific surface area of ​​150 to 400 m2 / g.

[0041] The particle size of the discarded silicon carbide brick particles is ≤0.700mm; the particle size of the special-grade alumina is ≤0.325mm; the particle size of the brown corundum is ≤0.068mm; the particle size of the graphite micropowder is ≤0.03mm fine powder; the particle size of the alumina micropowder is ≤0.025mm; and the particle size of the metallic silicon micropowder is ≤0.025mm.

[0042] A method for preparing an environmentally friendly ramming material, the method comprising the following steps:

[0043] First, the ingredients are weighed and mixed according to the above ratio, and the waste silicon carbide brick particles, special grade alumina, brown corundum, graphite powder, alumina powder and metal silicon powder are evenly mixed to obtain a mixture;

[0044] Then, the composite binder is added into the mixed material and stirred evenly in a mixer;

[0045] Finally, add the dispersant and continue stirring until the material can be kneaded into a ball by hand, and then seal and package it.

[0046] 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 ramming material, characterized in that: The environmentally friendly ramming mass is made of the following raw materials in parts by weight: The composite binder is made of the following raw materials in parts by weight: 35-40 parts of phenolic resin, 20-30 parts of anhydrous ethanol, 0.2-1 part of modified white carbon black, and 0.03-0.8 part of formaldehyde scavenger, wherein the formaldehyde scavenger is a compound containing a primary amine group.

2. An environmentally friendly ramming material according to claim 1, characterized in that: The dispersant is one or both of sodium tripolyphosphate and sodium hexametaphosphate.

3. An environmentally friendly ramming material according to claim 1, characterized in that: The modified white carbon black has a particle size of 7 to 40 nm and a specific surface area of ​​150 to 400 m 2 / g.

4. An environmentally friendly ramming material according to claim 1, characterized in that: The particle size of the discarded silicon carbide brick particles is ≤0.700mm; the particle size of the special-grade alumina is ≤0.325mm; the particle size of the brown corundum is ≤0.068mm; the particle size of the graphite micropowder is ≤0.03mm fine powder; the particle size of the alumina micropowder is ≤0.025mm; and the particle size of the metallic silicon micropowder is ≤0.025mm.

5. A method for preparing an environmentally friendly ramming material as claimed in any one of claims 1 to 4, characterized in that: The Method The following steps are involved: First, the ingredients are weighed and mixed according to the above ratio, and the waste silicon carbide brick particles, special grade alumina, brown corundum, graphite powder, alumina powder and metal silicon powder are evenly mixed to obtain a mixture; Then, the composite binder is added into the mixed material and stirred evenly in a mixer; Finally, add the dispersant and continue stirring until the material can be kneaded into a ball by hand, and then seal and package it.

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