Chromium-containing high-speed desulfurization slag inclusion removal washing agent and preparation method thereof

Abstract

The invention discloses a chromium-containing high-speed desulfurization slag inclusion removal washing agent and a preparation method thereof, and relates to the field of ferrous metallurgy. Chromium slag or a mixture of a chromium-containing material and an alumina-containing material reacts in a high-temperature oxygen-containing environment to obtain a corundum solid solution containing Cr < 3 + >; and crushing and sieving the corundum solid solution containing Cr < 3 + >, the CaO-containing material and the SiO2-containing material, and mixing to prepare the chromium-containing high-speed desulfurization slag inclusion removal washing agent. When the chromium-containing high-speed desulfurization slag inclusion removal washing agent is applied to the steelmaking process, chromium slag resources are recycled, the environmental protection property is enhanced, sulfur and other impurities in molten steel can be effectively and rapidly removed, the steel quality is optimized, the refining time is shortened, the steelmaking efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of iron and steel metallurgy, and in particular to a chromium-containing high-speed desulfurization and inclusion-removing slag lotion and a preparation method thereof. Background Art

[0002] In the process of steelmaking, slag detergent removes impurities such as sulfur and phosphorus in molten steel through the synergistic effect of physical adsorption of aggregated slag, chemical reaction removal and slag property regulation, adjusts the alkalinity and viscosity of slag to facilitate the separation of slag and molten steel, prevents molten steel from contacting and oxidizing with air, and reduces heat loss, thereby achieving the removal of impurities in molten steel and protecting molten steel. Common slag detergents are generally composed of CaO, MgO, Al 2 O 3 、SiO 2 Composition, of which SiO 2 Mainly used as flux in acid steelmaking process.

[0003] Chromium slag is a solid waste produced in the production of metallic chromium and other products, with an output of 60,000 to 80,000 tons per year. Due to the backwardness of science and technology, a large amount of chromium slag solid waste has not been recycled and treated in a timely and effective manner, causing environmental problems such as soil and water pollution. The main components of chromium slag are Al 2 O 3 and Cr 2 O 3 , Cr 3+ In the form of corundum (α-Al 2 O 3 ) has a hexagonal close-packed crystal structure, Cr 3+ Can replace Al by ion replacement 3+ Enter the crystal lattice and form a solid solution.

[0004] Based on this, it is of practical significance to apply chromium slag solid waste in the preparation process of slag detergent to achieve the goals of waste recycling and optimizing steel performance. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a chromium-containing high-speed desulfurization and inclusion-removing slag lotion and a preparation method thereof.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A chromium-containing high-speed desulfurization and inclusion-removing slag lotion, the preparation of which comprises the following steps:

[0008] Step S1, crush the chromium slag, stir for 20-25 minutes, and then pass through a 50-70 mesh sieve to obtain Al-containing 2 O 3 and Cr 2 O 3The mixture is placed at 1200-1300℃ for 3-5h to obtain Cr-containing 3+ Corundum solid solution;

[0009] Furthermore, the chromium slag in step S1 is selected from one of the slag produced by producing metallic chromium and the slag produced by producing chromium alloys. The chromium slag can also be replaced by a mixture of a chromium-containing material and an alumina-containing material in a mass ratio of 60-80 g:12-20 g; the chromium-containing material is selected from one of chromium slag, chromium trioxide, metallic chromium, and a chromium-containing alloy; the alumina-containing material is selected from one of corundum and high-alumina bauxite;

[0010] During the reaction of step S1, Al in the chromium slag 2 O 3 Under high temperature conditions, it is transformed into corundum (α-Al 2 O 3 ) crystal structure, Cr in chromium slag 3+ Can replace Al by ion replacement 3+ Enter the lattice to form Cr-containing 3+ When the chromium slag is replaced by chromium-containing materials and mixed with alumina-containing materials, the chromium slag, chromium trioxide, metallic chromium or chromium-containing alloy (converted to Cr under high temperature oxygen conditions) 2 O 3 ) in Cr 3+ Can replace Al by ion replacement 3+ Enter the lattice to form Cr-containing 3+ Corundum solid solution;

[0011] Step S2: 3+ Corundum solid solution, CaO-containing materials and SiO-containing materials 2 The materials were crushed and passed through a 4-6 mesh sieve to obtain the Cr-containing 3+ Corundum powder, CaO powder and SiO powder 2 Powder, containing Cr 3+ Corundum powder, CaO powder and SiO powder 2 The powders are mixed and stirred for 2-2.5 hours, then pelletized, and then dried at 150-250°C for 24-25 hours to obtain a chromium-containing high-speed desulfurization and inclusion-removing slag detergent;

[0012] Furthermore, the CaO-containing material is selected from one of limestone and quicklime, and the SiO 2 The material is selected from one of silica and wollastonite, containing Cr 3+ Corundum powder, CaO powder and SiO powder 2 The dosage ratio of the powder is 70-90g: 13-15g: 10-12g; the size of the pressed ball is 15-40mm; the Al in the chromium-containing high-speed desulfurization and inclusion removal slag lotion2 O 3 The content of is 60-80%, the content of CaO is 10-15%, and the content of SiO 2 The content is 8-10%, Cr 2 O 3 The content is 5-7%;

[0013] Beneficial effects of the present invention:

[0014] 1. The present invention provides a chromium-containing high-speed desulfurization and inclusion removal slag lotion and a preparation method thereof. The preparation process of the chromium-containing high-speed desulfurization and inclusion removal slag lotion makes high-value and efficient use of chromium slag, greatly reduces environmental pollution, and improves the secondary utilization rate of chromium resources.

[0015] 2. The present invention heats chromium slag (or chromium-containing material and alumina-containing material) under high temperature conditions to obtain Cr 3+ Can replace Al by ion replacement 3+ Enter the lattice to form Cr-containing 3+ The corundum solid solution structure improves the reactivity of alumina, enabling the slag detergent to remove harmful substances such as sulfides more quickly, thereby purifying molten steel, saving refining time, and effectively promoting energy conservation and carbon reduction in the steelmaking process.

[0016] 3. During the use of slag detergent in steelmaking, Cr 3+ It will be reduced to metallic chromium by the molten steel and evenly dispersed in the molten steel, improving the corrosion resistance, strength and hardness of the steel, thereby optimizing the quality of the steel. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] The composition table of the slag produced by producing metallic chromium used in the embodiment is as follows:

[0019]

[0020] Example 1

[0021] A chromium-containing high-speed desulfurization and inclusion-removing slag lotion, the preparation of which comprises the following steps:

[0022] Step S1, crush the slag produced by the production of metallic chromium, stir for 20 minutes and then pass it through a 50-mesh sieve to obtain Al-containing 2 O 3 and Cr 2 O3 The mixture was placed at 1200℃ for 3h to obtain Cr-containing 3+ Corundum solid solution;

[0023] Step S2: 3+ Corundum solid solution, CaO-containing materials and SiO-containing materials 2 The materials were crushed and passed through a 4-mesh sieve to obtain the Cr-containing 3+ Corundum powder, CaO powder and SiO powder 2 Powder, containing Cr 3+ Corundum powder, CaO powder and SiO powder 2 The powders were mixed and stirred for 2 hours and then pelletized, and then dried at 200°C for 24 hours to obtain a chromium-containing high-speed desulfurization and inclusion-removing slag lotion; the CaO-containing material was limestone (supplier: Zhengbing Lime Factory, Baligangou, Dongbao District, Jingmen City), and the SiO-containing material was 2 The material is silica (supplier: Lingshou County Hengshuo Mineral Products Co., Ltd.), containing Cr 3+ Corundum powder, CaO powder and SiO powder 2 The dosage ratio of the powder is 70g:13g:10g; the size of the pressed ball is 20mm; the Al in the chromium-containing high-speed desulfurization and inclusion removal slag lotion 2 O 3 The content of is 64%, the content of CaO is 10%, and the content of SiO 2 The content is 8%, Cr 2 O 3 The content is 5%.

[0024] The prepared chromium-containing high-speed desulfurization and inclusion removal slag detergent is applied to the refining process of the steel plant, with a desulfurization rate of 91%. The slag has moderate viscosity and strong adsorption capacity, which can effectively adsorb inclusions in molten steel and significantly improve the quality of steel. The slag has a fast slag formation speed, which can effectively shorten the refining time by 6 minutes. The steelmaking efficiency is high and the cost is low.

[0025] Example 2

[0026] A chromium-containing high-speed desulfurization and inclusion-removing slag lotion, the preparation of which comprises the following steps:

[0027] Step S1, crush the slag and corundum produced by the production of metallic chromium, stir for 23 minutes, and then pass through a 60-mesh sieve to obtain Al-containing 2 O 3 and Cr 2 O 3 The mixture was placed at 1200℃ for 3.3h to obtain Cr-containing 3+ The mass ratio of slag produced by producing metallic chromium to corundum is 60g:12g;

[0028] Step S2: 3+ Corundum solid solution, CaO-containing materials and SiO-containing materials 2 The materials were crushed and passed through a 5-mesh sieve to obtain the Cr-containing 3+ Corundum powder, CaO powder and SiO powder 2 Powder, containing Cr 3+ Corundum powder, CaO powder and SiO powder 2 The powders were mixed and stirred for 2.3 hours and then pelletized, and then dried at 200 °C for 24 hours to obtain a chromium-containing high-speed desulfurization and inclusion-removing slag lotion; the CaO-containing material was limestone (supplier: Zhengbing Lime Factory, Baligangou, Dongbao District, Jingmen City), and the SiO-containing material was 2 The material is silica (supplier: Lingshou County Hengshuo Mineral Products Co., Ltd.), containing Cr 3+ Corundum powder, CaO powder and SiO powder 2 The dosage ratio of the powder is 80g:14g:11g; the size of the pressed ball is 20mm; the Al in the chromium-containing high-speed desulfurization and inclusion removal slag lotion 2 O 3 The content of is 74%, the content of CaO is 11%, and the content of SiO 2 The content is 8%, Cr 2 O 3 The content is 5%.

[0029] The prepared chromium-containing high-speed desulfurization and inclusion removal slag detergent is applied to the refining process of the steel plant, with a desulfurization rate of 96%. The slag has moderate viscosity and strong adsorption capacity, which can effectively adsorb inclusions in molten steel and significantly improve the quality of steel. The slag has a fast slag formation speed, which can effectively shorten the refining time by 10 minutes. The steelmaking efficiency is high and the cost is low.

[0030] Example 3

[0031] A chromium-containing high-speed desulfurization and inclusion-removing slag lotion, the preparation of which comprises the following steps:

[0032] Step S1, crush the slag produced by the production of metallic chromium, stir for 25 minutes and then pass it through a 70-mesh sieve to obtain Al-containing 2 O 3 and Cr 2 O 3 The mixture was placed at 1200℃ for 5 hours to obtain Cr-containing 3+ Corundum solid solution;

[0033] Step S2: 3+ Corundum solid solution, CaO-containing materials and SiO-containing materials 2 The materials were crushed and passed through a 6-mesh sieve to obtain the Cr-containing 3+ Corundum powder, CaO powder and SiO powder 2Powder, containing Cr 3+ Corundum powder, CaO powder and SiO powder 2 The powders were mixed and stirred for 2.5 hours and then pelletized, and then dried at 200°C for 25 hours to obtain a chromium-containing high-speed desulfurization and inclusion-removing slag lotion; the CaO-containing material was limestone (supplier: Zhengbing Lime Factory, Baligangou, Dongbao District, Jingmen City), and the SiO-containing material was 2 The material is silica (supplier: Lingshou County Hengshuo Mineral Products Co., Ltd.), containing Cr 3+ Corundum powder, CaO powder and SiO powder 2 The dosage ratio of the powder is 90g:15g:12g; the size of the pressed ball is 20mm; the Al in the chromium-containing high-speed desulfurization and inclusion removal slag lotion 2 O 3 The content of is 68%, the content of CaO is 11%, and the content of SiO 2 The content is 8%, Cr 2 O 3 The content is 5%.

[0034] The prepared chromium-containing high-speed desulfurization and inclusion removal slag detergent is applied to the refining process of the steel plant, with a desulfurization rate of 92%. The slag has moderate viscosity and strong adsorption capacity, which can effectively adsorb inclusions in molten steel and significantly improve the quality of steel. The slag has a fast slag formation speed, which can effectively shorten the refining time by 8 minutes. The steelmaking efficiency is high and the cost is low.

[0035] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a chromium-containing high-speed desulfurization and inclusion-removing slag lotion, characterized in that: The steps include: Step S1, crushing and stirring the chromium slag and sieving it to obtain a mixture containing Al2O3 and Cr2O3, and heating the mixture at high temperature to obtain a mixture containing Cr2O3. 3+ Corundum solid solution; Step S2: 3+ The corundum solid solution, CaO-containing material and SiO2-containing material were crushed and sieved to obtain Cr-containing 3+ The corundum powder, CaO powder and SiO2 powder containing Cr 3+ The corundum powder, the CaO-containing powder and the SiO2-containing powder are mixed and stirred, and then subjected to ball pressing and drying to obtain a chromium-containing high-speed desulfurization and inclusion-removing slag lotion.

2. The method for preparing a chromium-containing high-speed desulfurization and inclusion-removing slag lotion according to claim 1, characterized in that: The chromium slag in step S1 is selected from one of the slag produced by producing metallic chromium and the slag produced by producing chromium alloy, and the mesh number of the sieving is 50-70 meshes.

3. The method for preparing a chromium-containing high-speed desulfurization and inclusion-removing slag lotion according to claim 1, characterized in that: The chromium slag in step S1 can also be replaced by a mixture of chromium-containing material and aluminum oxide-containing material in a mass ratio of 60-80 g:12-20 g.

4. The method for preparing a chromium-containing high-speed desulfurization and inclusion-removing slag lotion according to claim 3, characterized in that: The chromium-containing material is selected from one of chromium slag, chromium trioxide, metallic chromium, and chromium-containing alloy; the aluminum oxide-containing material is selected from one of corundum and high-alumina bauxite.

5. The method for preparing a chromium-containing high-speed desulfurization and inclusion-removing slag lotion according to claim 1, characterized in that: In step S2, the CaO-containing material is selected from one of limestone and quicklime, and the SiO2-containing material is selected from one of silica and wollastonite.

6. The method for preparing a chromium-containing high-speed desulfurization and inclusion-removing slag lotion according to claim 1, characterized in that: The mesh size of the sieve in step S2 is 4-6 meshes, and the size of the pressed balls is 15-40 mm.

7. The method for preparing a chromium-containing high-speed desulfurization and inclusion-removing slag lotion according to claim 1, characterized in that: Step S2 contains Cr 3+ The usage ratio of corundum powder, CaO-containing powder and SiO2-containing powder is 70-90g: 13-15g: 10-12g.

8. The method for preparing a chromium-containing high-speed desulfurization and inclusion-removing slag lotion according to claim 1, characterized in that: The chromium-containing high-speed desulfurization and inclusion-removing slag lotion in step S2 has an Al2O3 content of 60-80%, a CaO content of 10-15%, a SiO2 content of 8-10%, and a Cr2O3 content of 5-7%.

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