Low-medium temperature wear-resistant castable and preparation method and application thereof

Abstract

The application provides a kind of medium-low temperature wear-resistant castable and its preparation method and application.The castable includes the following weight parts of each raw material: metallurgical waste residue 45-70 parts, waste porcelain 15-35 parts, micro-fine coke 5-8 parts, alumina micro-powder 3-6 parts, silica fume 3-6 parts, aluminate cement 5-8 parts and additives 0.15-0.35 parts.The application uses metallurgical waste residue as raw material to prepare wear-resistant castable with excellent performance, realizes the recycling of difficult-to-use metallurgical waste residue, and has important significance.The castable of the application has high strength, excellent wear resistance, and can be used in thermal equipment such as cement kiln waste heat power generation at a temperature of 300-800 DEG C, improving the operation stability of the equipment.

Description

Technical Field

[0001] This invention belongs to the field of refractory materials technology, specifically, it relates to a medium- and low-temperature wear-resistant castable, its preparation method, and its application. Background Technology

[0002] Iron and steel smelting generates a large amount of metallurgical waste slag. These solid wastes cannot be naturally degraded. The main ways to utilize metallurgical waste slag in my country are: magnetic separation of steel slag to remove low-melting-point substances, re-sintering in blast furnaces to recover useful metal elements, direct use in road paving, and application in cement production and the construction industry.

[0003] Metallurgical slag is mainly composed of magnesium olivine and spinel, which give it high hardness. Its main chemical components include magnesium oxide, aluminum oxide, and silicon dioxide. After high-temperature use, its composition does not undergo significant changes. It exhibits structural stability and good wear resistance, making it valuable for the preparation of refractory materials. Summary of the Invention

[0004] The purpose of this invention is to provide a medium- and low-temperature wear-resistant castable, its preparation method, and its application.

[0005] To achieve the objective of this invention, in a first aspect, this invention provides a medium-low temperature wear-resistant castable, comprising the following raw materials in parts by weight: 45-70 parts metallurgical waste slag, 15-35 parts waste porcelain, 5-8 parts coke alumina powder, 3-6 parts alumina powder, 3-6 parts silica fume, 5-8 parts aluminate cement, and 0.15-0.35 parts additives.

[0006] Preferably, the raw materials include the following parts by weight: 45 parts metallurgical waste slag, 35 parts waste porcelain, 8 parts coke alumina powder, 3 parts alumina powder, 2 parts silica fume, 7 parts aluminate cement, and 0.17 parts additives.

[0007] Preferably, the raw materials include the following parts by weight: 60 parts metallurgical waste slag, 25 parts waste porcelain, 5 parts coke alumina powder, 3 parts alumina powder, 4 parts silica fume, 6 parts aluminate cement, and 0.22 parts additives.

[0008] Preferably, the raw materials include the following parts by weight: 70 parts metallurgical waste slag, 15 parts waste porcelain, 6 parts coke alumina powder, 3 parts alumina powder, 4 parts silica fume, 5 parts aluminate cement, and 0.27 parts additives.

[0009] The total amount of the above raw materials is 100 portions.

[0010] The metallurgical slag is a magnesium aluminum spinel-magnesia olivine system, in which the mass percentage of Al2O3 is 20-30% and the mass percentage of MgO is 20-40%. See Liang Jinyuan, Zhang Lihua, Liu Laibao, et al. Preparation and properties of high-carbon ferrochrome slag-based spinel-magnesia olivine high-strength ceramic aggregate [J]. Bulletin of the Chinese Ceramic Society, 2023, 42(3):1054-1062. Meng Qingfei, Fan Xiaoxiong, Gu Liqiang, et al. Characteristics of ferrochrome slag aggregate and its application as a green concrete material [J]. China Building Materials Science and Technology, 2023, 32(2):37-40. OI:10.12164 / j.issn.1003-8965.2023.02.011. Qiu Baixin, Gu Xingyong, Dong Weixia, et al. Effects of sintering temperature on the properties of ferrochrome slag and characterization [J]. Comprehensive Utilization of Mineral Resources, 2020(1):188-193,162. DOI:10.3969 / j.issn.1000-6532.2020.01.038.

[0011] The additive can be selected from one or more of the following: explosion-proof fiber, carboxymethyl cellulose, and aluminum sulfate.

[0012] Secondly, the present invention provides a method for preparing the castable, comprising the following steps:

[0013] (1) Mix metallurgical waste slag, waste porcelain, coke alumina powder, alumina powder and silica fume evenly to obtain material I;

[0014] (2) Add the additive to the aluminate cement and mix evenly to obtain material II;

[0015] (3) Mix material I and material II in proportion and stir to obtain the final product.

[0016] Thirdly, the present invention provides the use of the castable as a refractory lining material for a reactor.

[0017] Fourthly, the present invention provides a refractory material prepared from the castable.

[0018] The refractory material is used at temperatures ranging from 300 to 800°C.

[0019] By employing the above technical solution, the present invention has at least the following advantages and beneficial effects:

[0020] (I) This invention provides an effective way to utilize metallurgical waste slag for high-value purposes. Metallurgical waste slag is reused as a refractory raw material to prepare wear-resistant castables, thus solving the problem of metallurgical waste slag stockpiling.

[0021] (II) This invention uses metallurgical waste slag as raw material to prepare high-performance wear-resistant castable, realizing the reuse of waste resources, which is of great significance.

[0022] (III) The castable prepared by this invention has excellent high-temperature resistance, with a service temperature of up to about 800℃, and wear resistance ≤6cm. 3 It can be applied to thermal equipment such as cement kilns, waste incinerators, and hazardous waste incinerators to improve the operational stability of the equipment. Detailed Implementation

[0023] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art, and the raw materials used are all commercially available products.

[0024] The metallurgical waste used in the following examples was provided by Jiexiu Shuangfeng Refractory Materials Co., Ltd.

[0025] The fused alumina powder, silica fume, aluminate cement, and explosion-proof fiber were purchased from Yangquan Jinyu Tongda High Temperature Materials Co., Ltd., Gansu Sanyuan Silicon Materials Co., Ltd., Zhengzhou Dengfeng Melting Material Co., Ltd., and Liaoyang Juxin Chemical Fiber Co., Ltd., respectively.

[0026] The compositions of the metallurgical waste slag, waste porcelain, and coke agate powder used in the following examples are as follows:

[0027]

[0028] Low-temperature wear-resistant castable in Example 1

[0029] This embodiment provides a castable refractory prepared from the following raw materials in parts by weight: 45 parts metallurgical waste slag, 35 parts waste porcelain, 8 parts coke alumina powder, 3 parts alumina powder, 2 parts silica fume, 7 parts aluminate cement, and 0.17 parts explosion-proof fiber.

[0030] The properties of the castable refractory described in this embodiment are shown in Table 1:

[0031] Table 1

[0032]

[0033] The preparation method of the castable is as follows:

[0034] (1) Mix metallurgical waste slag, waste porcelain, coke alumina powder, alumina powder and silica fume evenly to obtain material I;

[0035] (2) Add the explosion-proof fiber to the aluminate cement and mix evenly to obtain material II;

[0036] (3) Mix material I and material II in proportion and stir to obtain the final product.

[0037] Low-temperature wear-resistant castable in Example 2

[0038] This embodiment relates to a castable refractory prepared from the following raw materials in parts by weight: 60 parts metallurgical waste slag, 25 parts waste porcelain, 5 parts coke alumina powder, 3 parts alumina powder, 4 parts silica fume, 6 parts aluminate cement, and 0.22 parts carboxymethyl cellulose.

[0039] The properties of the castable described in this embodiment are shown in Table 2:

[0040] Table 2

[0041]

[0042] The preparation method of the castable is as follows:

[0043] (1) Mix metallurgical waste slag, waste porcelain, coke alumina powder, alumina powder and silica fume evenly to obtain material I;

[0044] (2) Add carboxymethyl cellulose to aluminate cement and mix evenly to obtain material II;

[0045] (3) Mix material I and material II in proportion and stir to obtain the final product.

[0046] Low-temperature wear-resistant castable in Example 3

[0047] This embodiment relates to a castable refractory prepared from the following raw materials in parts by weight: 70 parts metallurgical waste slag, 15 parts waste porcelain, 6 parts coke alumina powder, 3 parts alumina powder, 4 parts silica fume, 5 parts aluminate cement and 0.27 parts aluminum sulfate.

[0048] The properties of the castable described in this embodiment are shown in Table 3:

[0049] Table 3

[0050]

[0051] The preparation method of the castable is as follows:

[0052] (1) Mix metallurgical waste slag, waste porcelain, coke alumina powder, alumina powder and silica fume evenly to obtain material I;

[0053] (2) Add aluminum sulfate to aluminate cement and mix well to obtain material II;

[0054] (3) Mix material I and material II in proportion and stir to obtain the final product.

[0055] Comparative Example 1

[0056] Compared with the example, the difference lies in the different proportions of metallurgical waste slag. The specific proportions are as follows: 72 parts metallurgical waste slag, 13 parts waste porcelain, 5 parts coke alumina powder, 3 parts alumina powder, 3 parts silica fume, 4 parts aluminate cement and 0.25 parts explosion-proof fiber.

[0057] The properties of the castable described in this comparative example are shown in Table 4:

[0058] Table 4

[0059]

[0060] The preparation method of the castable is as follows:

[0061] (1) Mix metallurgical waste slag, waste porcelain, coke alumina powder, alumina powder and silica fume evenly to obtain material I;

[0062] (2) Add the explosion-proof fiber to the aluminate cement and mix evenly to obtain material II;

[0063] (3) Mix material I and material II in proportion and stir to obtain the final product.

[0064] Comparative Example 2

[0065] Compared with the example, the difference lies in the different proportion of metallurgical waste slag. The specific proportion is as follows: 40 parts metallurgical waste slag, 40 parts waste porcelain, 9 parts coke alumina powder, 3 parts alumina powder, 3 parts silica fume, 5 parts aluminate cement and 0.25 parts carboxymethyl cellulose.

[0066] The properties of the castable described in this comparative example are shown in Table 5:

[0067] Table 5

[0068]

[0069] The preparation method of the castable is as follows:

[0070] (1) Mix metallurgical waste slag, waste porcelain, coke alumina powder, alumina powder and silica fume evenly to obtain material I;

[0071] (2) Add carboxymethyl cellulose to aluminate cement and mix evenly to obtain material II;

[0072] (3) Mix material I and material II in proportion and stir to obtain the final product.

[0073] The results of the above comparison show that if the proportions of each raw material are not reasonable, the material’s fire resistance, alkali resistance and overall performance will be significantly reduced.

[0074] The measurement methods for each indicator are shown in Table 6.

[0075] Table 6

[0076]

[0077] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A medium-low temperature wear-resistant castable, characterized in that, It is composed of the following raw materials in parts by weight: 45-70 parts metallurgical waste slag, 15-35 parts waste porcelain, 5-8 parts coke alumina powder, 3-6 parts alumina powder, 3-6 parts silica fume, 5-8 parts aluminate cement, and 0.15-0.35 parts additives. The metallurgical waste slag is a magnesium aluminum spinel-magnesium olivine system, wherein the mass percentage of Al2O3 is 20-30% and the mass percentage of MgO is 20-40%. The additive is selected from one or more of explosion-proof fibers, carboxymethyl cellulose, and aluminum sulfate.

2. The castable refractory according to claim 1, characterized in that, It is composed of the following raw materials in parts by weight: 45 parts metallurgical waste slag, 35 parts waste porcelain, 8 parts coke alumina powder, 3 parts alumina powder, 2 parts silica fume, 7 parts aluminate cement, and 0.17 parts additives.

3. The castable refractory according to claim 1, characterized in that, It is composed of the following raw materials in parts by weight: 60 parts metallurgical waste slag, 25 parts waste porcelain, 5 parts coke alumina powder, 3 parts alumina powder, 4 parts silica fume, 6 parts aluminate cement, and 0.22 parts additives.

4. The castable refractory according to claim 1, characterized in that, It is composed of the following raw materials in parts by weight: 70 parts metallurgical waste slag, 15 parts waste porcelain, 6 parts coke alumina powder, 3 parts alumina powder, 4 parts silica fume, 5 parts aluminate cement, and 0.27 parts additives.

5. A method for preparing the castable according to any one of claims 1-4, characterized in that, Includes the following steps: (1) Mix metallurgical waste slag, waste porcelain, coke alumina powder, alumina powder and silica fume evenly to obtain material I; (2) Add the additive to the aluminate cement and mix evenly to obtain material II; (3) Mix material I and material II in proportion and stir to obtain the final product.

6. Use of the castable according to any one of claims 1-4 as a refractory lining material for a reactor.

7. A refractory material, characterized in that, It is prepared from the castable material described in any one of claims 1-4.

8. The refractory material according to claim 7, characterized in that, The refractory material is used at temperatures ranging from 300 to 800°C.

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