High-erosion-resistance slag ladle spray coating and preparation method thereof

Abstract

The invention belongs to the field of amorphous refractory products of refractory materials, and particularly relates to a high-erosion-resistance slag ladle spray coating and a preparation method thereof. The slag ladle spray coating comprises the following raw materials in parts by weight: 25-32 parts of bentonite, 21-40 parts of dolomite, 15-22 parts of clay, 11-20 parts of converter slag powder, 4-8 parts of refining slag powder, 5-10 parts of quick lime, 1-3 parts of an accelerator, 1-3 parts of an anti-slag agent and 2-5 parts of an additive. The slag ladle spray coating prepared by the method has certain rebound rate and breaking strength, also has certain stripping resistance, and is not easy to strip within a short time after being sprayed; and more importantly, the spraying material is good in sizing after being added into a suspending agent and uniformly stirred, does not precipitate, has good flowability and is convenient for construction.

Description

Technical Field

[0001] The invention belongs to the field of refractory unshaped refractory products, and in particular relates to a high-corrosion-resistant slag pot spray coating and a preparation method thereof. Background Art

[0002] A large amount of slag is produced during the steel smelting process. If not properly handled, these waste slags will pollute the environment through the atmosphere and water. Therefore, the high-temperature slag produced needs to be transported to the slag yard for treatment. At this time, the slag is in a state of solid-liquid coexistence. During the transportation process, a container is needed to hold this solid-liquid coexistence. The container holding the solid-liquid coexistence is called a slag pot.

[0003] In order to prevent liquid slag and residual molten steel from sticking to the inner wall of the slag pot and causing the slag pot to stick and become scrapped, to increase the emptying rate and reduce the consumption of the slag pot, spray coating is used to protect the slag pot before use to increase the service life of the slag pot. At present, the slag pot spray coating is mainly composed of quicklime, dolomite, magnesia and clay. These raw materials need to be purchased from outside and are expensive and inconvenient to transport. In order to reduce production costs, it is urgent to develop slag pot coatings that have excellent slag resistance, non-stick slag, high temperature resistance, shock resistance and peeling resistance, and are easy to construct. Summary of the invention

[0004] In view of the problems existing in the background technology, the present invention provides a highly erosion-resistant slag pot spray coating and a preparation method thereof, and the obtained spray coating has excellent erosion resistance and high temperature resistance, which is achieved by the following technical solutions: The weight proportions of the raw materials are as follows: 25-32 parts of bentonite, 21-40 parts of dolomite, 15-22 parts of clay, 11-20 parts of converter slag powder, 4-8 parts of refined slag powder, 5-10 parts of quicklime, 1-3 parts of accelerator, 1-3 parts of anti-slag agent, and 2-5 parts of additives.

[0005] A highly corrosion-resistant slag pot coating, and a preparation method thereof, comprising the following steps: Step (1): put dolomite, converter slag powder, refined slag powder and quicklime into a nylon can, grind them in a planetary mill for 48 hours, dry them and sieve them; Step (2): weigh 25-32 parts of bentonite, 21-40 parts of dolomite, 15-22 parts of clay, 11-20 parts of converter slag powder, 4-8 parts of refined slag powder, and 5-10 parts of quicklime, and dry-mix them for 2-3 minutes, then slowly add an accelerator, an anti-slag agent, and an additive, and wet-mix them for 3-5 minutes to obtain a mixed material; Step (3): When spraying, add a certain amount of suspending agent to the mud and stir evenly before use.

[0006] Preferably, the accelerating setting agent is selected from one or more of alkaline earth metal carbonates, sodium silicate, sodium aluminate and potassium aluminate.

[0007] Preferably, the additive is selected from one or more of sodium carboxymethyl cellulose, sodium tripolyphosphate, methyl cellulose, and sodium hexametaphosphate.

[0008] Further preferably, the operating parameters of the planetary mill during grinding in step (1) are: orbital speed 350 r / min, rotation speed 200 r / min, ball: material = 10:1.

[0009] Further preferably, in step (1), a certain amount of deionized water is added as a grinding medium to improve the grinding efficiency, and the mixture is dried and passed through a 120-mesh sieve.

[0010] Compared with the prior art, the present invention has the following advantages: The converter slag powder and refined slag powder in the raw materials used in the present invention replace part of clay and quicklime, and the required amount of clay and quicklime is reduced, so the clay and quicklime that need to be purchased are reduced, thereby reducing the production cost. The slag pot spray coating obtained by this process has a certain rebound rate and flexural strength, good slag resistance, and can effectively isolate waste slag and pot body without sticking slag, extend the service life of the slag pot, and reduce the loss of the slag pot; it also has a certain anti-flaking property, and after spraying, it is not easy to peel off in a short time; more importantly, the spray coating is well shaped after adding the suspending agent and stirring evenly, does not precipitate, has good fluidity, and is easy to construct. DETAILED DESCRIPTION

[0011] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention. Example

[0012] (1) Put dolomite, converter slag powder, refined slag powder and quicklime into a nylon pot, with a ball: material ratio of 10:1, grind in a planetary mill with a revolution speed of 350 r / min and a rotation speed of 200 r / min for 48 hours, dry and pass through a 120-mesh sieve; (2) Weigh 26 parts of bentonite, 25 parts of dolomite, 15 parts of clay, 13 parts of converter slag powder, 4 parts of refined slag powder, and 10 parts of quicklime according to the number of parts, and dry mix them for 2 to 3 minutes. Then slowly add 2 parts of accelerator, 2 parts of anti-slag agent, and 3 parts of additives and wet mix them for 3 to 5 minutes to obtain a mixed material; (3) When spraying, add a certain amount of suspending agent to the mud and stir evenly before use. Example

[0013] (1) Put dolomite, converter slag powder, refined slag powder and quicklime into a nylon pot, with a ball: material ratio of 10:1, grind in a planetary mill with a revolution speed of 350 r / min and a rotation speed of 200 r / min for 48 hours, dry and pass through a 120-mesh sieve; (2) Weigh 30 parts of bentonite, 21 parts of dolomite, 15 parts of clay, 11 parts of converter slag powder, 8 parts of refined slag powder, and 10 parts of quicklime according to the number of parts, and dry mix them for 2 to 3 minutes. Then slowly add 1 part of accelerating setting agent, 1 part of anti-slag agent, and 3 parts of additives and wet mix them for 3 to 5 minutes to obtain a mixed material; (3) When spraying, add a certain amount of suspending agent to the mud and stir evenly before use. Example

[0014] (1) Put dolomite, converter slag powder, refined slag powder and quicklime into a nylon pot, with a ball: material ratio of 10:1, grind in a planetary mill with a revolution speed of 350 r / min and a rotation speed of 200 r / min for 48 hours, dry and pass through a 120-mesh sieve; (2) Weigh 25 parts of bentonite, 36 parts of dolomite, 15 parts of clay, 11 parts of converter slag powder, 4 parts of refined slag powder, and 5 parts of quicklime according to the number of parts, and dry mix them for 2 to 3 minutes. Then slowly add 1 part of accelerating setting agent, 1 part of anti-slag agent, and 2 parts of additives and wet mix them for 3 to 5 minutes to obtain a mixed material; (3) When spraying, add a certain amount of suspending agent to the mud and stir evenly before use. Example

[0015] (1) Put dolomite, converter slag powder, refined slag powder and quicklime into a nylon pot, with a ball: material ratio of 10:1, grind in a planetary mill with a revolution speed of 350 r / min and a rotation speed of 200 r / min for 48 hours, dry and pass through a 120-mesh sieve; (2) Weigh 29 parts of bentonite, 21 parts of dolomite, 22 parts of clay, 11-20 parts of converter slag powder, 7 parts of refined slag powder, and 10 parts of quicklime according to the number of parts, and dry-mix them for 2-3 minutes. Then slowly add 3 parts of accelerator, 3 parts of anti-slag agent, and 5 parts of additives and wet-mix them for 3-5 minutes to obtain a mixed material; (3) When spraying, add a certain amount of suspending agent to the mud and stir evenly before use. Example

[0016] (1) Put dolomite, converter slag powder, refined slag powder and quicklime into a nylon pot, with a ball: material ratio of 10:1, grind in a planetary mill with a revolution speed of 350 r / min and a rotation speed of 200 r / min for 48 hours, dry and pass through a 120-mesh sieve; (2) Weigh 25 parts of bentonite, 24 parts of dolomite, 20 parts of clay, 16 parts of converter slag powder, 5 parts of refined slag powder, and 5 parts of quicklime according to the number of parts, and dry mix them for 2 to 3 minutes. Then slowly add 1 part of accelerating setting agent, 2 parts of anti-slag agent, and 2 parts of additives and wet mix them for 3 to 5 minutes to obtain a mixed material; (3) When spraying, add a certain amount of suspending agent to the mud and stir evenly before use. Example

[0017] (1) Dolomite, converter slag powder, refined slag powder and quicklime were placed in a nylon pot with a ball: material ratio of 10:1, and ground in a planetary mill at a revolution speed of 350 r / min and a rotation speed of 200 r / min for 48 hours, dried and sieved; (2) Weigh 30 parts of bentonite, 25 parts of dolomite, 15 parts of clay, 17 parts of converter slag powder, 4 parts of refined slag powder, and 5 parts of quicklime, and dry mix them for 2-3 minutes. Then slowly add 1 part of accelerating setting agent, 1 part of anti-slag agent, and 2 parts of additives, and wet mix them for 3-5 minutes. Then, pass through a 200-mesh sieve to obtain a mixed material. (3) When spraying, add a certain amount of suspending agent to the mud and stir evenly before use. Example

[0018] Performance Testing The slag pot spray coatings obtained in Examples 1 to 6 were tested for rebound rate and flexural strength, and the results are shown in Table 1.

[0019] Table 1 Test results of rebound rate and flexural strength of slag tank spray coating

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A highly corrosion-resistant slag pot spray coating, characterized in that: The weight proportions of the raw materials are as follows: 25-32 parts of bentonite, 21-40 parts of dolomite, 15-22 parts of clay, 11-20 parts of converter slag powder, 4-8 parts of refined slag powder, 5-10 parts of quicklime, 1-3 parts of accelerating setting agent, 1-3 parts of anti-slag agent, and 2-5 parts of additives; The highly corrosion-resistant slag pot coating, and its preparation method, comprises the following steps: Step (1): put dolomite, converter slag powder, refined slag powder and quicklime into a nylon can, grind them in a planetary mill for 48 hours, dry them and sieve them; Step (2): weigh 25-32 parts of bentonite, 21-40 parts of dolomite, 15-22 parts of clay, 11-20 parts of converter slag powder, 4-8 parts of refined slag powder, and 5-10 parts of quicklime, and dry-mix them for 2-3 minutes, then slowly add an accelerator, an anti-slag agent, and an additive, and wet-mix them for 3-5 minutes to obtain a mixed material; Step (3): When spraying, add a certain amount of suspending agent to the mud and stir evenly before use.

2. The highly corrosion-resistant slag pot spray coating according to claim 1, characterized in that: The quick-setting agent is selected from one or more of alkaline earth metal carbonate, sodium silicate, sodium aluminate and potassium aluminate.

3. The highly corrosion-resistant slag pot spray coating according to claim 1, characterized in that: The additive is selected from one or more of sodium carboxymethyl cellulose, sodium tripolyphosphate, methyl cellulose and sodium hexametaphosphate.

4. The method for preparing a highly corrosion-resistant slag pot coating according to claim 1, characterized in that: The operating parameters of the planetary mill grinding in step (1) are: orbital speed 350 r / min, rotation speed 200 r / min, ball: material = 10:

1.

5. The method for preparing a highly corrosion-resistant slag pot coating according to claim 1, characterized in that: In step (1), a certain amount of deionized water is added as a grinding medium to improve the grinding efficiency, and the mixture is dried and passed through a 120-mesh sieve.

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