Recycling method of refractory material in waste RH insert tube

Abstract

The invention provides an application of a waste RH insert tube in a converter smelting process. The invention also provides a corresponding recycling method of the refractory material in the waste RH insert tube. According to the invention, calcium oxide and magnesium oxide contained in the waste RH insert tube refractory material and components in the used magnesia carbon brick form a slag system with proper melting point and high viscosity, and a large amount of carbon dioxide gas and jet gas generated in the decomposition process of the refractory material are used for stirring and spraying the slag system, so that the slag can be easily adhered to the wall of a converter, and the slag is prevented from falling off. And part of high-magnesium lime can be replaced, so that the cost of auxiliary materials is reduced. According to the method, recycling of the waste RH insert pipe refractory is effectively achieved, the refractory is applied to converter slag splashing, consumption of high-magnesium lime in the converter smelting process is reduced, the effect of protecting a furnace lining can be achieved, cost and auxiliary material consumption are reduced, and effective utilization of resources is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of recycling resources of waste RH insert tubes, relates to the application of waste RH insert tubes in a converter smelting process, a method for recycling refractory materials in waste RH insert tubes, and in particular, relates to a method for recycling refractory materials in waste RH insert tubes. Background Art

[0002] Refractory materials are very important auxiliary materials in the iron and steel metallurgical industry and are widely used in steel enterprises. If the waste refractory materials in the steelmaking process can be recycled, the preparation cost of refractory materials can be greatly reduced, which will drive the cost reduction and efficiency increase of the steel industry and have significant economic and social benefits.

[0003] With the continuous rise in the price of refractory materials, giving full play to the recycling and reuse of waste refractory materials, especially the refractory materials in waste RH insert tubes, and further enhancing their utilization value are of great significance to the sustainable and healthy development of steel enterprises.

[0004] The existing technical solutions also disclose some related technical solutions for the recycling of waste refractory materials, but most of them do not involve the waste refractory materials in the RH insertion tube, and the related recycling solutions have the problem of causing damage to the reuse scenario.

[0005] Therefore, how to find a more suitable production method to effectively realize the recycling of waste RH insertion tube refractory materials, solve the above-mentioned problems existing in the existing recycling, and realize the effective utilization of resources is also one of the problems that many front-line researchers in the industry need to solve urgently. Summary of the invention

[0006] In view of this, the technical problem to be solved by the present invention is to provide an application of waste RH insert tubes in the converter smelting process and a method for recycling refractory materials in waste RH insert tubes. The present invention reduces the cost of auxiliary materials by recycling RH insert tube refractory materials to replace part of the high-magnesium lime added to the converter during slag splashing. The invention creates significant economic benefits after implementation and can be promoted and applied in the same industry in China.

[0007] The invention provides application of waste RH insertion tubes in a converter smelting process.

[0008] Preferably, the waste RH insertion tube is specifically the refractory material in the waste RH insertion tube;

[0009] The application includes the use of waste RH insert tubes and bentonite binder in a converter smelting process.

[0010] Preferably, the converter smelting process is specifically a slag splashing furnace protection step after converter smelting;

[0011] The application is specifically to replace part of the high-magnesium lime in the slag splashing furnace protection step.

[0012] Preferably, the replacement mass ratio of the refractory material in the waste RH insertion tube to the high-magnesium lime is 1:(2.03-2.66);

[0013] The mass content of MgO in the refractory material in the waste RH insertion tube is 65% to 85%.

[0014] The present invention provides a method for recycling refractory materials in waste RH insertion tubes, comprising the following steps:

[0015] 1) After removing the metal material in the waste RH insertion tube, crush it to obtain refractory crushed material;

[0016] 2) mixing the crushed refractory material obtained in the above step with a binder and then making balls to obtain spherical material;

[0017] 3) The spherical material obtained in the above steps is added into the converter smelting process to realize the recycling and reuse of the waste RH insertion tube.

[0018] Preferably, the crushing method includes ball milling;

[0019] The particle size of the crushed material is ≤5mm.

[0020] Preferably, the binder comprises a bentonite binder;

[0021] The mass ratio of the crushed material to the binder is (95-105):1.

[0022] Preferably, the ball making further comprises a drying step;

[0023] The refractory material includes a magnesia refractory material.

[0024] Preferably, the converter smelting process is specifically the slag splashing furnace protection process after converter smelting;

[0025] The adding specifically refers to replacing part of the high-magnesium lime.

[0026] Preferably, the mass content of MgO in the refractory material in the waste RH insertion tube is 65% to 85%;

[0027] The MgO content in the high-magnesium lime is 32%;

[0028] The replacement mass ratio of the refractory material in the waste RH insertion tube to the high-magnesium lime is 1:(2.03-2.66).

[0029] The present invention provides the application of waste RH insert tubes in the converter smelting process. Compared with the prior art, the present invention particularly applies the refractory materials in the waste RH insert tubes in the converter smelting process, and also provides a corresponding method for recycling and reusing the refractory materials in the waste RH insert tubes. The present invention reduces the cost of auxiliary materials by recycling the refractory materials of the RH insert tubes to replace part of the high-magnesium lime added to the converter during slag splashing. The present invention creates significant economic benefits after implementation. The invention can be promoted and applied in the same industry in China.

[0030] The present invention mainly utilizes the calcium oxide and magnesium oxide contained in the waste RH insertion tube refractory to form a slag system with appropriate melting point and high viscosity with the components in the used magnesium carbon brick. In addition, the refractory generates a large amount of carbon dioxide gas during the decomposition process, which, together with the jet gas, stirs and sprays the slag system, so that the slag can easily adhere to the wall of the converter, protecting the furnace lining, and can also replace part of the high-magnesium lime to reduce the cost of auxiliary materials. The present invention effectively realizes the recycling of waste RH insertion tube refractory, and is applied when the converter splashes slag, reducing the consumption of high-magnesium lime in the converter smelting process, which can not only protect the furnace lining, but also reduce the cost and auxiliary material consumption, and realize the effective utilization of resources.

[0031] The actual application results show that the invention can effectively realize the recycling of waste RH insertion tube refractory materials, reducing costs and auxiliary material consumption. After implementation, the invention has created significant economic benefits, and is expected to create more than 5.5 million yuan per year. DETAILED DESCRIPTION

[0032] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the invention.

[0033] All raw materials of the present invention have no particular limitation on their sources, and can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0034] There is no particular limitation on the purity of all raw materials in the present invention. The present invention preferably uses industrial purity or conventional purity used in the converter smelting production field.

[0035] The invention provides application of waste RH insertion tubes in a converter smelting process.

[0036] In the present invention, the waste RH insertion tube is preferably a refractory material in the waste RH insertion tube.

[0037] In the present invention, the application preferably includes the application of waste RH insert tubes and bentonite binder in a converter smelting process.

[0038] In the present invention, the converter smelting process is preferably a slag splashing furnace protection step after converter smelting.

[0039] In the present invention, the application is preferably used in the slag splashing furnace protection step to replace part of the high-magnesium lime.

[0040] In the present invention, the replacement mass ratio of the refractory material to the high-magnesium lime in the waste RH insertion tube is preferably 1:(2.03-2.66), more preferably 1:(2.1-2.6), more preferably 1:(2.2-2.5), and more preferably 1:(2.3-2.4).

[0041] In the present invention, the mass content of MgO in the refractory material in the waste RH insertion tube is preferably 65% ​​to 85%, more preferably 69% to 81%, and more preferably 73% to 77%.

[0042] The present invention provides a method for recycling refractory materials in waste RH insertion tubes, comprising the following steps:

[0043] 1) After removing the metal material in the waste RH insertion tube, crush it to obtain refractory crushed material;

[0044] 2) mixing the crushed refractory material obtained in the above step with a binder and then making balls to obtain spherical material;

[0045] 3) The spherical material obtained in the above steps is added into the converter smelting process to realize the recycling and reuse of the waste RH insertion tube.

[0046] The invention first removes the metal material in the waste RH insertion tube and then crushes it to obtain the crushed refractory material.

[0047] In the present invention, the crushing method preferably includes ball milling.

[0048] In the present invention, the particle size of the crushed material is preferably ≤5 mm, more preferably ≤4.5 mm, and more preferably ≤4 mm.

[0049] The present invention further mixes the refractory material crushed material obtained in the above steps with a binder and then makes balls to obtain spherical materials.

[0050] In the present invention, the binder preferably includes a bentonite binder.

[0051] In the present invention, the mass ratio of the crushed material to the binder is preferably (95-105):1, more preferably (97-103):1, more preferably (99-101):1, and specifically can be 100:1.

[0052] In the present invention, the ball making preferably further includes a drying step.

[0053] In the present invention, the refractory material preferably includes a magnesia refractory material.

[0054] Finally, the spherical material obtained in the above steps is added into the converter smelting process to realize the recycling and reuse of the waste RH insertion tube.

[0055] In the present invention, the converter smelting process is preferably the slag splashing furnace protection process after converter smelting.

[0056] In the present invention, the addition is preferably performed by replacing part of the high-magnesium lime.

[0057] In the present invention, the mass content of MgO in the refractory material in the waste RH insertion tube is preferably 65% ​​to 85%, more preferably 69% to 81%, and more preferably 73% to 77%.

[0058] In the present invention, the MgO content in the high-magnesium lime is preferably 32%.

[0059] In the present invention, the replacement mass ratio of the refractory material to the high-magnesium lime in the waste RH insertion tube is preferably 1:(2.03-2.66), more preferably 1:(2.1-2.6), more preferably 1:(2.2-2.5), and more preferably 1:(2.3-2.4).

[0060] The present invention is a complete and detailed overall technical solution, which further improves the efficiency of recycling and reusing refractory materials in waste RH insert tubes. The application of the waste RH insert tubes in the converter smelting process and a method for recycling and reusing refractory materials in waste RH insert tubes may specifically include the following contents:

[0061] The present invention provides a method for recycling and reusing waste RH insertion tube refractory materials, comprising:

[0062] (1) Collect the used RH insertion tubes, remove the metal stuck on the insertion tubes, and then classify and recycle them;

[0063] (2) crushing the waste RH insertion tube refractory material, and grinding the crushed material into a particle size of less than 5 mm using a ball mill;

[0064] (3) adding bentonite binder to the crushed material and using a ball making machine to make balls;

[0065] (4) After drying, the prepared balls are added to replace part of the high-magnesium lime during slag splashing.

[0066] Specifically, the refractory material of the RH insertion tube in the present invention is a magnesia refractory material.

[0067] Specifically, the MgO content in the waste RH insertion tube refractory of the present invention is 65-85%, and the MgO content in the high-magnesium lime is 32%.

[0068] Specifically, the replacement ratio of waste refractory materials to high-magnesium lime is 1:2.03~2.66.

[0069] The above content of the present invention provides the application of waste RH insert tubes in the converter smelting process and a method for recycling the refractory materials in the waste RH insert tubes. The present invention particularly applies the refractory materials in the waste RH insert tubes in the converter smelting process, and also provides a corresponding method for recycling the refractory materials in the waste RH insert tubes. The present invention reduces the cost of auxiliary materials by recycling the refractory materials of the RH insert tubes to replace part of the high-magnesium lime added to the converter during slag splashing. The present invention creates obvious economic benefits after implementation, and the invention can be promoted and applied in the same industry in China.

[0070] The present invention mainly utilizes the calcium oxide and magnesium oxide contained in the waste RH insertion tube refractory to form a slag system with appropriate melting point and high viscosity with the components in the used magnesium carbon brick. In addition, the refractory generates a large amount of carbon dioxide gas during the decomposition process, which, together with the jet gas, stirs and sprays the slag system, so that the slag can easily adhere to the wall of the converter, protecting the furnace lining, and can also replace part of the high-magnesium lime to reduce the cost of auxiliary materials. The present invention effectively realizes the recycling of waste RH insertion tube refractory, and is applied when the converter splashes slag, reducing the consumption of high-magnesium lime in the converter smelting process, which can not only protect the furnace lining, but also reduce the cost and auxiliary material consumption, and realize the effective utilization of resources.

[0071] The actual application results show that the invention can effectively realize the recycling of waste RH insertion tube refractory materials, reducing costs and auxiliary material consumption. After implementation, the invention has created significant economic benefits, and is expected to create more than 5.5 million yuan per year.

[0072] In order to further illustrate the present invention, the application of the waste RH insert tube provided by the present invention in the converter smelting process and a method for recycling and reusing refractory materials in the waste RH insert tube are described in detail below in combination with the embodiments. However, it should be understood that these embodiments are implemented on the premise of the technical scheme of the present invention, and detailed implementation methods and specific operating processes are given only to further illustrate the features and advantages of the present invention, rather than to limit the claims of the present invention, and the protection scope of the present invention is not limited to the following embodiments.

[0073] Example 1

[0074] The used waste RH insertion tubes are collected and the metal materials are removed before being crushed. The crushed materials are rolled to a particle size of less than 5 mm using a ball mill, and then bentonite binder (1%) is added to the crushed materials to make balls. The MgO content of the recycled materials obtained in this example is 73%. When the slag is splashed and the furnace is protected after the smelting of a steel converter, the recycled materials are added to replace part of the high-magnesium lime. The raw and auxiliary materials before smelting are calculated to be 220 kg of recycled materials made of RH gunning material and waste refractory materials. According to calculations, 500 kg of high-magnesium lime (MgO 32%) can be replaced in this batch. The converter smelting process is normal and there is no obvious erosion of the furnace lining.

[0075] Example 2

[0076] The used waste RH insertion tubes are collected and the metal materials are removed before being crushed. The crushed materials are rolled to a particle size of less than 5 mm using a ball mill, and then bentonite binder (1%) is added to the crushed materials to make balls. The MgO content of the recycled materials obtained in this example is 65%. When the slag is splashed and the furnace is protected after the smelting of a steel converter, the recycled materials are added to replace part of the high-magnesium lime. The raw and auxiliary materials before smelting are calculated to be 246 kg of recycled materials made of RH gunning material and waste refractory materials. According to calculations, 500 kg of high-magnesium lime (MgO 32%) can be replaced in this batch. The converter smelting process is normal and there is no obvious erosion of the furnace lining.

[0077] The above is a detailed introduction to a method for recycling and reusing refractory materials in waste RH insert tubes provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas, including the best mode, and also enables any technician in the field to practice the present invention, including the manufacture and use of any device or system, and the implementation of any combined method. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The scope of patent protection of the present invention is defined by the claims and may include other embodiments that can be thought of by those skilled in the art. If these other embodiments have structural elements that are not different from the literal expression of the claims, or if they include equivalent structural elements that are not substantially different from the literal expression of the claims, then these other embodiments should also be included in the scope of the claims.

Claims

1. Application of waste RH insertion tubes in converter smelting process.

2. The use according to claim 1, characterized in that: The waste RH insertion tube is specifically the refractory material in the waste RH insertion tube; The application includes the use of waste RH insert tubes and bentonite binder in a converter smelting process.

3. The use according to claim 2, characterized in that: The converter smelting process specifically includes the slag splashing and furnace protection step after converter smelting; The application is specifically to replace part of the high-magnesium lime in the slag splashing furnace protection step.

4. The use according to claim 3, characterized in that: The replacement mass ratio of the refractory material in the waste RH insertion tube to the high-magnesium lime is 1:(2.03-2.66); The mass content of MgO in the refractory material in the waste RH insertion tube is 65% to 85%.

5. A method for recycling refractory materials in waste RH insertion tubes, characterized in that: The following steps are involved: 1) After removing the metal material in the waste RH insertion tube, crush it to obtain refractory crushed material; 2) mixing the crushed refractory material obtained in the above step with a binder and then making balls to obtain spherical material; 3) The spherical material obtained in the above steps is added into the converter smelting process to realize the recycling and reuse of the waste RH insertion tube.

6. The recycling method according to claim 5, characterized in that: The crushing method includes ball milling; The particle size of the crushed material is ≤5mm.

7. The recycling method according to claim 5, characterized in that: The binder includes a bentonite binder; The mass ratio of the crushed material to the binder is (95-105):

1.

8. The recycling method according to claim 5, characterized in that: The ball making process also includes a drying step; The refractory material includes a magnesia refractory material.

9. The recycling method according to claim 5, characterized in that: The converter smelting process is specifically the slag splashing furnace protection process after converter smelting; The adding specifically refers to replacing part of the high-magnesium lime.

10. The recycling method according to claim 9, characterized in that: The mass content of MgO in the refractory material in the waste RH insertion tube is 65% to 85%; The MgO content in the high-magnesium lime is 32%; The replacement mass ratio of the refractory material in the waste RH insertion tube to the high-magnesium lime is 1:(2.03-2.66).