Mineral material prepared from water granulated slag and preparation method of mineral material

Abstract

The invention discloses a mineral material prepared from water granulated slag. The mineral material is prepared from the following main chemical components in percentage by weight: 45 to 65 percent of 3CaO. SiO2, 10 to 30 percent of 2CaO. SiO2, 5 to 15 percent of 3CaO. Al2O3 and 10 to 20 percent of 4CaO. Al2O3. Fe2O3. The density is not less than 2.8 g / m < 3 >, the fineness is that the screen residue of a 45 mu m square hole sieve is not more than 10.0%, the initial setting time is not less than 60 minutes, and the final setting time is not more than 600 minutes. The method has the advantages that the recycled water granulated slag is fully utilized, meanwhile, the performance of mineral materials made of the water granulated slag can be effectively improved, the using effect is improved, the requirements for compressive strength and breaking strength are met, and the using requirements of customers are met.

Description

Technical Field

[0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a slag-making mineral material and a manufacturing method thereof. Background Art

[0002] Slag is a byproduct produced by blast furnaces and hot metal smelting furnaces in steel plants during the manufacturing process of steel products, accounting for about 30% to 40% of steel production. In recent years, with the rapid development of my country's steel industry, the amount of slag produced has also increased year by year. After water quenching, the main mineral composition is silicon-alumina glass, which has good potential hydraulic hardness and can be ground into concrete admixtures. The comprehensive utilization rate of steel slag is about 22%. The main mineral composition is overburned tricalcium silicate and dicalcium silicate, olivine, rhodonite, RO phase, etc. The main uses are road materials, engineering backfill materials, building materials, and ground into cement admixtures and concrete admixtures. The preparation of steel slag powder can also help steel plants solve the environmental pressure of "zero emission" of steel slag.

[0003] However, the current utilization rate of slag is low, the recycling method is relatively simple, and the physical and chemical properties of admixtures made from slag are not high, so it cannot achieve better results in actual application. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of low utilization rate of existing water slag and poor physicochemical properties of minerals, and to provide a method for manufacturing mineral materials from water slag. While making full use of the recycled water slag, the performance of the mineral materials manufactured from water slag can be effectively improved, thereby enhancing the use effect.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A slag manufacturing mineral material, the main chemical components and their percentages include: 3CaO·SiO2: 45-65%, 2CaO·SiO2: 10-30%, 3CaO·Al2O3: 5-15%, 4CaO·Al2O3·Fe2O3: 10-20%. Its main performance requirements are: density ≥ 2.8 g / m 3 The fineness is 45μm square hole sieve residue ≤10.0%, initial setting time ≥60min, final setting time ≤600min, which meets the requirements of compressive strength and flexural strength and meets the customer's use requirements.

[0006] Furthermore, the main chemical components and percentages of the mineral material include: 3CaO·SiO2: 45-60%, 2CaO·SiO2: 10-20%, 3CaO·Al2O3: 5-10%, 4CaO·Al2O3·Fe2O3: 10-15%.

[0007] Furthermore, the main chemical components and percentages of the mineral material include: 3CaO·SiO2: 50-65%, 2CaO·SiO2: 20-30%, 3CaO·Al2O3: 10-15%, 4CaO·Al2O3·Fe2O3: 15-20%.

[0008] In order to further achieve the purpose of the present invention, a method for manufacturing mineral materials from slag is also provided, and the specific steps are as follows: (1) Recover hot metal slag, desulfurization slag, converter slag, electric furnace slag, refining slag and continuous casting slag respectively, and separate the recovered slag from steel and pulverize it; (2) The pulverized hot metal slag, desulfurization slag, converter slag, electric furnace slag, refining slag and continuous casting slag are mixed and stirred in a ratio of 1:2:3:3:3:1; (3) The mixed and stirred slag is sent to the slag treatment workshop for slag stewing operation. The stewing time is 3 to 5 days and the stewing temperature is 800 to 1200°C; (4) The slag after slagging is pulverized and mixed with desulfurized gypsum, water, and waste sand in a ratio of 1:2:1:8; (5) The stirring temperature is 0-50°C, and cementitious materials are added to prepare mineral admixtures.

[0009] Furthermore, in the step (3), the slag stewing temperature is 950°C.

[0010] Furthermore, in the step (3), the slag stewing temperature is 880°C.

[0011] Furthermore, in the step (5), the stirring temperature is 40°C.

[0012] Furthermore, in the step (5), the stirring temperature is 20°C.

[0013] Compared with the prior art, the advantages of the technical solution of the present invention are: (1) The present invention realizes green circular economy production of enterprises by screening blast furnace slag, converter slag, electric furnace slag, refining slag and continuous casting slag, and reasonably allocating and finely processing them for manufacturing mineral materials; (2) The present invention reduces the pollution of water environment and air by slag waste through the recycling of waste materials, realizes the green operation of the steel industry, and enhances the image of enterprises; (3) After testing the physicochemical properties of the minerals, the mineral materials produced by the present invention have met the requirements of the same cement grade and have achieved mass production. The products are highly practical and the supply performance continues to improve; (4) The present invention mixes the pulverized water slag with slag, desulfurized gypsum, water and waste sand in a ratio of 1:4:1:10, which is obtained through continuous practice verification and has a unique formula use right. Moreover, the formula can be used by other enterprises and has product versatility; (5) The mineral material produced by the present invention using water slag has high density and small fineness, and the use effect is better by increasing the condensation time. DETAILED DESCRIPTION Example 1

[0014] In order to make the present invention more clear, a slag-based mineral material and a method for producing the same are further described below. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0015] The main chemical components and percentages of a slag-making mineral material in this embodiment include: 3CaO·SiO2: 53%, 2CaO·SiO2: 16%, 3CaO·Al2O3: 8%, 4CaO·Al2O3·Fe2O3: 13%, and the rest are impurities.

[0016] In this embodiment, a method for manufacturing mineral materials from slag is also provided, which is characterized by: S1. Recover hot metal slag, desulfurization slag, converter slag, electric furnace slag, refining slag and continuous casting slag respectively, and separate and pulverize the recovered slag; S2, the pulverized hot metal slag, desulfurization slag, converter slag, electric furnace slag, refined slag, and continuous casting slag are mixed and stirred in a ratio of 1:2:3:3:3:1; S3, the mixed and stirred slag is sent to the slag treatment workshop for slag stewing operation, the slag stewing time is 5 days, and the slag stewing temperature is 950°C; S4, the slag after slagging is pulverized and mixed with desulfurized gypsum, water, and waste sand in a ratio of 1:2:1:8; S5. Stirring temperature is 40°C, and adding cementitious materials to prepare mineral admixtures. Example 2

[0017] The main chemical components and percentages of a slag-making mineral material in the present embodiment include: 3CaO·SiO2: 63%, 2CaO·SiO2: 29%, 3CaO·Al2O3: 13%, 4CaO·Al2O3·Fe2O3: 16%, and the rest are impurities.

[0018] This embodiment also provides a method for manufacturing mineral materials from slag, which is characterized by: S1. Recover hot metal slag, desulfurization slag, converter slag, electric furnace slag, refining slag and continuous casting slag respectively, and separate and pulverize the recovered slag; S2, the pulverized hot metal slag, desulfurization slag, converter slag, electric furnace slag, refined slag, and continuous casting slag are mixed and stirred in a ratio of 1:2:3:3:3:1; S3, the mixed and stirred slag is sent to the slag treatment workshop for slag stewing operation, the slag stewing time is 3 days, and the slag stewing temperature is 880°C; S4, the slag after slagging is pulverized and mixed with desulfurized gypsum, water, and waste sand in a ratio of 1:2:1:8; S5. Stirring temperature is 20°C, and cementitious materials are added to prepare mineral admixtures.

[0019] The properties of the mineral materials produced by the above two embodiments are as follows:

[0020] It can be seen from the table that the mineral admixture provided by the present invention has performance that meets the strength requirements of cement, can replace the use of cement in product applications, and has been promoted and applied, thereby improving the green recycling of steel enterprises.

[0021] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A method for producing mineral materials from slag, characterized in that: The main chemical components and percentages of the mineral material include: 3CaO·SiO2: 45-65%, 2CaO·SiO2: 10-30%, 3CaO·Al2O3: 5-15%, 4CaO·Al2O3·Fe2O3: 10-20%. Its density is ≥2.8 g / m 3 , fineness, i.e. 45μm square hole sieve residue ≤10.0%, initial setting time ≥60min, final setting time ≤600min.

2. The slag-making mineral material according to claim 1, characterized in that: The main chemical components and percentages of the mineral material include: 3CaO·SiO2: 45-60%, 2CaO·SiO2: 10-20%, 3CaO·Al2O3: 5-10%, 4CaO·Al2O3·Fe2O3: 10-15%.

3. The slag-making mineral material according to claim 1, characterized in that: The main chemical components and percentages of the mineral material include: 3CaO·SiO2: 50-65%, 2CaO·SiO2: 20-30%, 3CaO·Al2O3: 10-15%, 4CaO·Al2O3·Fe2O3: 15-20%.

4. A method for producing mineral materials from slag as claimed in claim 1, characterized in that: (1) Recover hot metal slag, desulfurization slag, converter slag, electric furnace slag, refining slag and continuous casting slag respectively, and separate the recovered slag from steel and pulverize it; (2) The pulverized hot metal slag, desulfurization slag, converter slag, electric furnace slag, refining slag and continuous casting slag are mixed and stirred in a ratio of 1:2:3:3:3:1; (3) The mixed and stirred slag is sent to the slag treatment workshop for slag stewing operation. The stewing time is 3 to 5 days and the stewing temperature is 800 to 1200°C; (4) The slag after slagging is pulverized and mixed with desulfurized gypsum, water, and waste sand in a ratio of 1:2:1:8; (5) The stirring temperature is 0-50°C, and cementitious materials are added to prepare mineral admixtures.

5. The method for producing mineral materials from slag according to claim 4, characterized in that: In the step (3), the slag stewing temperature is 950°C.

6. The method for producing mineral materials from slag according to claim 4, characterized in that: In the step (3), the slag stewing temperature is 880°C.

7. The method for producing mineral materials from slag according to claim 4, characterized in that: In the step (5), the stirring temperature is 40°C.

8. The method for producing mineral materials from slag according to claim 4, characterized in that: In the step (5), the stirring temperature is 20°C.

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