Electric furnace settling chamber dedusting ash cold bonding ball, manufacturing method and using method

Abstract

The invention relates to an electric furnace settling chamber fly ash cold bonding ball, a manufacturing method and a using method. The electric furnace settling chamber fly ash cold bonding ball comprises the following components in percentage by weight: 90-95% of electric furnace settling chamber fly ash, 5-8% of limestone and 3-5% of a binder. The manufacturing method of the electric furnace settling chamber fly ash cold-bonded ball comprises the following steps: S1, uniformly mixing the electric furnace settling chamber fly ash, limestone and a binder; s2, forming cold-bonded balls through a ball press machine by adopting a cold-pressing bonding curing forming process; and S3, screening and drying. According to the method, the electric furnace settling chamber dedusting ash and the limestone are made into the cold solid balls through the adhesive, and the cold solid balls are used in converter smelting, so that the melting point of the slag is reduced, the flowability of the slag is improved, and meanwhile, the recycling of the electric furnace settling chamber after dedusting is realized.

Description

Technical Field

[0001] The invention relates to the technical field of recycling dust from an electric furnace settling chamber, and in particular to a cold-solidified ball of dust from an electric furnace settling chamber, a manufacturing method and a use method thereof. Background Art

[0002] With the rapid development of the steel industry, a large amount of dust is inevitably produced, which not only occupies land, but also pollutes the environment and causes huge waste of resources. Dust ash mainly includes sintering dust, blast furnace dust, electric furnace dust, converter dust, refining dust, etc. Due to the complex chemical composition of dust ash, it contains lead, chlorine and other oxygen elements that are harmful to the human body. It is a hazardous waste, so its effective utilization rate is low. With people's increasing attention to environmental issues, comprehensive recycling and utilization of dust ash has become an inevitable choice for enterprises.

[0003] Dust ash contains not only a considerable amount of iron, but also a certain amount of CaO, MgO, FeO, MnO, etc., so it has a high recycling value. At present, the recycling uses of dust ash generated in the steel industry are mainly: (1) as sintering and pelletizing ingredients, directly adding converter ash and other ingredients to sintering ingredients; (2) using rotary hearth furnace technology to mix iron ore powder or dust ash, coal powder, etc. according to a certain ratio, adding an appropriate amount of binder, pressing balls, and drying; (3) converter ash briquetting; (4) dust ash beneficiation and recycling; (5) used as paste filling material in mine goaf; (6) making electric furnace foam slag; (7) used for cement clinker optimization ingredients, etc. However, due to different production processes and production equipment, the composition and characteristics of different dust ash are also different, and the methods of their recycling are also different.

[0004] The Chinese invention patent with the authorization announcement number CN106745960B discloses a method for comprehensive utilization of steelmaking refining dust, which allows steelmaking refining dust and cold rolling acid wastewater to be treated, solves the environmental protection problem, realizes waste treatment, and can recover valuable elements such as Fe, Zn, and Mn in steelmaking refining dust and cold rolling acid wastewater. The Chinese invention patent application with the application publication number CN103031409A discloses a new process for steelmaking deoxidation using refining furnace dust, which uses refining furnace dust as a deoxidizer and is suitable for silicon-killed steel and silicon-aluminum-killed steel. However, the above schemes are all about the utilization of steelmaking refining dust, and there is very little about the comprehensive utilization of electric furnace settling chamber dust. The main component of the electric furnace settling chamber dust is total iron, which is as high as 61% or more, of which the FeO content reaches 49.16%, followed by CaO, which is 10.11%, and has the feasibility of recycling in the steelmaking production process. Therefore, the composition characteristics of the dust removed from the settling chamber of the electric furnace can be fully utilized to achieve comprehensive utilization. Summary of the invention

[0005] The purpose of the present invention is to address the defects of the prior art and provide a cold-solidified ball, a manufacturing method and a use method of dust ash from an electric furnace settling chamber. The dust ash from the electric furnace settling chamber and limestone are made into cold-solidified balls through an adhesive, and the cold-solidified balls are used in converter smelting, which reduces the melting point of the slag, improves the fluidity of the slag, and at the same time realizes the recycling of the dust from the electric furnace settling chamber.

[0006] In order to solve the above technical problems, in the first aspect, the present invention provides a cold-solidified ball of dust ash from a settling chamber of an electric furnace, comprising the following components in weight percentage: dust ash from a settling chamber of an electric furnace: 90-95%, limestone: 5-8%, and a binder: 3-5%.

[0007] Furthermore, the binder includes an organic or inorganic synthetic binder.

[0008] In a second aspect, the present invention provides a method for manufacturing cold-solidified balls of dust removed from an electric furnace settling chamber, comprising:

[0009] S1. Evenly mix the dust removal ash, limestone and binder in the electric furnace settling chamber;

[0010] S2, adopt cold pressing bonding curing molding process, and form cold solid balls through ball pressing machine;

[0011] S3, screening and drying.

[0012] Furthermore, in step S3, the cold-solidified balls are dried by drying or airing.

[0013] In a third aspect, the present invention provides a method for using a dust ash cooling ball in an electric furnace settling chamber, comprising:

[0014] S1. Add a certain amount of dust-removing ash cold-solidified balls from the electric furnace settling chamber at the beginning of converter blowing;

[0015] S2. Determine whether the slag is dry. If the slag is dry, add the dust-removed ash cold-solidified balls in the electric furnace settling chamber again.

[0016] Furthermore, in step S1, the amount of cold-solidified balls of dust removed from the electric furnace settling chamber added in the initial stage of converter blowing is 15-20 kg / t steel.

[0017] Furthermore, in step S2, when the slag is dried, the dust-removed ash cold-solidified balls in the settling chamber of the electric furnace are added to the converter in batches.

[0018] Furthermore, in step S2, the interval between adding the dust-removing ash cold-solidified balls from the settling chamber of the electric furnace into the converter in batches is 1 minute, and the amount added in each batch is 1.0-2.0 kg / t steel.

[0019] The beneficial effects of the present invention are:

[0020] 1. The cold solid ball of the present invention comprises dust removal ash from the electric furnace settling chamber and limestone. The dust removal ash from the electric furnace settling chamber has a FeO content of 49.16% and a CaO content of 10.11%. The cold solid ball is added at the initial stage of converter blowing. FeO and CaO can appropriately increase the basicity of the slag in the initial stage of converter blowing, reduce the melting point of the initial slag, accelerate the formation time of the initial slag, and promote the flow of the slag, which has a significant effect on improving the dephosphorization ability of the converter slag. The limestone is decomposed by heat, broken and quickly dispersed into fine particles, which are evenly spread on the surface of the slag to accelerate the reaction between the limestone and the slag. At the same time, the limestone decomposes to produce CaO, which can appropriately increase the basicity of the slag, thereby improving the dephosphorization effect.

[0021] When drying out occurs during the converter blowing process, adding cold solid balls and FeO in the dust removal ash in the electric furnace settling chamber can appropriately increase the FeO content in the slag, promote the fluidity of the slag, and solve the problem of drying out.

[0022] 2. When the drying phenomenon occurs during the converter blowing process, the cold solid balls are added in batches to avoid the phenomenon of FeO aggregation in the slag, thereby preventing the slag from excessive foaming. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] This embodiment provides a cold-solidified ball of dust removal ash from a settling chamber of an electric furnace of the present invention, comprising the following components in weight percentage: dust removal ash from a settling chamber of an electric furnace: 90-95%, limestone: 5-8%, and a binder: 3-5%.

[0025] In this embodiment, the binder is an organic or inorganic synthetic binder.

[0026] By adding 5-8% limestone, the limestone will be decomposed and broken by heat, and quickly dispersed into fine particles, which are evenly spread on the slag surface to accelerate the reaction rate. At the same time, the limestone decomposes to produce CaO, which can appropriately increase the basicity of the slag, thereby improving the dephosphorization effect.

[0027] The manufacturing method of the dust removal ash cold solid ball of the electric furnace settling chamber comprises:

[0028] S1, mixing the dust removal ash, limestone and binder in the electric furnace settling chamber uniformly, wherein the weight percentages of the dust removal ash, limestone and binder in the electric furnace settling chamber are 90-95%, 5-8% and 3-5% respectively;

[0029] S2, adopt cold pressing bonding curing molding process, and form cold solid balls through ball pressing machine;

[0030] S3, screening, drying, drying by oven drying or air drying.

[0031] The method for using the dust removal ash cooling ball in the electric furnace settling chamber includes:

[0032] S1. At the beginning of converter blowing, a certain amount of cold-solidified balls of dust removal ash from the electric furnace settling chamber is added. The amount of cold-solidified balls of dust removal ash from the electric furnace settling chamber is 15-20kg / t steel, that is, 15-20k of cold-solidified balls of dust removal ash from the electric furnace settling chamber is added per ton of steel;

[0033] S2. Determine whether the slag is dry. If so, add the dust-removed ash cold balls from the electric furnace settling chamber into the converter in batches at an interval of 1 minute. The amount added in each batch is 1.0-2.0 kg / t steel.

[0034] In this embodiment, the dust-removing ash cold-solidified balls of the electric furnace settling chamber are used on a 120-ton converter in a certain factory, and the smelting steel type is HRB400. The dust-removing ash cold-solidified balls of the electric furnace settling chamber are added in the early stage of converter smelting and when the slag is dried out. After adding in the early stage of converter blowing, the slag formation time is shortened, 47 seconds in advance on average, which is beneficial to the early dephosphorization, and the final phosphorus content is reduced by an average of 0.0014%. When the slag is dried out, add an appropriate amount of dust-removing ash cold-solidified balls of the electric furnace settling chamber to the converter in two batches. After a period of time, the drying phenomenon disappears, and the subsequent blowing process is stable. See the table below for details.

[0035]

[0036]

[0037] The cold solid ball of the present invention comprises dust removed from the electric furnace settling chamber and limestone. The FeO content and the CaO content in the dust removed from the electric furnace settling chamber are 49.16% and 10.11%, respectively. The cold solid ball is added at the initial stage of converter blowing. FeO and CaO can appropriately increase the basicity of the slag at the initial stage of converter blowing, reduce the melting point of the initial slag, accelerate the formation time of the initial slag, and promote the flow of the slag, which has an obvious effect on improving the dephosphorization ability of the converter slag. The limestone is decomposed and broken by heat and quickly dispersed into fine particles, which are evenly scattered on the surface of the slag to accelerate the reaction between the limestone and the slag. At the same time, the limestone decomposes to produce CaO, which can appropriately increase the basicity of the slag, thereby improving the dephosphorization effect.

[0038] When drying out occurs during the converter blowing process, adding cold solid balls and FeO in the dust removal ash in the electric furnace settling chamber can appropriately increase the FeO content in the slag, promote the fluidity of the slag, and solve the problem of drying out.

[0039] When the dry-out phenomenon occurs during the converter blowing process, the cold solid balls are added in batches, thereby preventing the slag from FeO agglomeration and preventing the slag from excessive bubbling.

[0040] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A cold solid ball for dust removal in an electric furnace settling chamber, characterized in that: The invention comprises the following components in weight percentage: electric furnace sedimentation chamber dust: 90-95%, limestone: 5-8%, and binder: 3-5%.

2. The dust-removing ash cooling ball for the electric furnace settling chamber according to claim 1 is characterized in that: The binder includes an organic or inorganic synthetic binder.

3. The method for manufacturing cold-solidified balls of dust removed from an electric furnace settling chamber according to claim 1 or 2, characterized in that: include: S1. Evenly mix the dust removal ash, limestone and binder in the electric furnace settling chamber; S2, adopt cold pressing bonding curing molding process, and form cold solid balls through ball pressing machine; S3, screening and drying.

4. The manufacturing method according to claim 3, characterized in that: In step S3, the cold-solidified balls are dried by drying or airing.

5. The method for using the dust ash cooling balls for the electric furnace settling chamber according to claim 1 or 2, characterized in that: include: S1. Add a certain amount of dust-removing ash cold-solidified balls from the electric furnace settling chamber at the beginning of converter blowing; S2. Determine whether the slag is dry. If the slag is dry, add the dust-removed ash cold-solidified balls in the electric furnace settling chamber again.

6. The method of use according to claim 5, characterized in that: In step S1, the amount of cold-solidified balls of dust removed from the electric furnace settling chamber added in the initial stage of converter blowing is 15-20 kg / t steel.

7. The method of use according to claim 5, characterized in that: In step S2, when the slag is dry, the dust-removed ash cold-solidified balls in the settling chamber of the electric furnace are added to the converter in batches.

8. The method of use according to claim 7, characterized in that: In step S2, the amount of cold-solidified balls of dust removed from the electric furnace settling chamber added in each batch is 1.0-2.0 kg / t steel.

9. The method of use according to claim 7, characterized in that: In step S2, the interval between adding the dust-removed ash cooled balls from the settling chamber of the electric furnace into the converter in batches is 1 minute.

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