阅读说明：本技术 一种焦炭热结构强化剂 (Coke thermal structure reinforcer ) 是由 屠永海 孙玉海 陈军 于 2019-11-15 设计创作，主要内容包括：本发明涉及一种焦炭热结构强化剂,属于高炉冶炼铁技术领域。该热强化剂由如下重量百分比的原料组成：硼酐30％,白炭黑30％,长白石20％,硅微粉15％,滑石5％；各种原料经过超细粉碎达到500目以上细度,搅拌混合均匀,用50-60℃清水或熄焦水溶解,所得溶液即为焦炭热结构强化剂。使用时,利用熄焦塔喷淋管喷洒该溶液进行熄焦。本发明可有效使焦炭热反应性降低1-2％,反应后热强度提高4-5％。(The invention relates to a coke thermal structure enhancer, belonging to the technical field of blast furnace iron smelting. The heat enhancer comprises the following raw materials in percentage by weight: 30% of boric anhydride, 30% of white carbon black, 20% of feldspar, 15% of silicon micropowder and 5% of talc; the raw materials are subject to ultrafine grinding to reach the fineness of more than 500 meshes, stirred and mixed evenly, and dissolved by clear water or coke quenching water at 50-60 ℃, and the obtained solution is the coke thermal structure enhancer. When in use, the solution is sprayed by a spray pipe of a coke quenching tower for quenching coke. The invention can effectively reduce the heat reactivity of the coke by 1-2% and improve the heat strength after reaction by 4-5%.)

1. A coke thermal structure reinforcer is characterized by comprising the following raw materials in percentage by weight: 30% of boric anhydride, 30% of white carbon black, 15% of dolomite, 5% of titanium dioxide, 15% of silica powder and 5% of talcum; the raw materials are subject to ultrafine grinding to reach the fineness of more than 500 meshes, stirred and mixed evenly, and dissolved by clear water or coke quenching water at 50-60 ℃, and the obtained solution is the coke thermal structure enhancer.

Technical Field

The invention relates to a coke thermal structure enhancer, belonging to the technical field of blast furnace iron smelting.

Background

The iron and steel enterprises have more and more requirements on raw materials, the cost is continuously increased, and along with the increase of the volume of the blast furnace, higher requirements are also provided for smelting raw materials: the high-temperature metallurgical performance of coke becomes a further strengthening limiting factor of a blast furnace, how to reduce the reactivity (CRI) of the coke, improve the thermal strength (CSR) after reaction, ensure the irreplaceable skeleton and support function of the coke in the blast furnace, and ensure the smooth running of gas in the blast furnace and the smooth smelting of the blast furnace becomes an important research problem in the iron smelting industry. For coking enterprises, due to various factors such as different types of coke ovens and different coal blending methods, the quality of produced coke can be greatly different. Although starting from the production link of coke, the proportion of high-quality coking coal is increased, the quality of coal blending is improved, and the quality of coke can be improved by adopting the technical measures of improving the quality of coke, such as tamping coking, briquette briquetting, coal moisture control, dry quenching and the like, the technical measures can greatly increase the production cost of the coking process, thereby influencing the economic benefit of the whole coking enterprise.

Most of coke passivators for improving coke performance are mainly prepared from cheap industrial borax (Na2B4O7 & 10H2O), the purity of the industrial borax is greatly different according to the processing technology, meanwhile, the borax is insoluble in water, a large amount of precipitates in a dissolving solution exist, the stability of the performance is uncertain due to dosage fluctuation, and various performance indexes are suddenly high and suddenly low in the practical application process.

The other passivator product adopts a large amount of lanthanide-containing rare earth elements as the raw materials of the formula, and although the passivator has certain effect, the production cost is increased, and the passivator is not beneficial to industrial popularization and use.

Disclosure of Invention

The invention aims to provide a coke thermal structure enhancer, aiming at effectively reducing the reactivity of coke, improving the strength of the coke after reaction and improving the quality of coke products by spraying the coke thermal structure enhancer on the surface of the coke in the coke quenching process under the existing coke quality condition.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a coke thermal structure reinforcer is composed of the following raw materials by weight percent: 30% of boric anhydride, 30% of white carbon black, 15% of dolomite, 5% of titanium dioxide, 15% of silica powder and 5% of talcum; the raw materials are subject to ultrafine grinding to reach the fineness of more than 500 meshes, stirred and mixed evenly, and dissolved by clear water or coke quenching water at 50-60 ℃, and the obtained solution is the coke thermal structure enhancer. When in use, the solution is sprayed by a spray pipe of a coke quenching tower for quenching coke.

Compared with the prior art, the invention adopting the technical scheme has the beneficial effects that:

the present invention is based on the formation of coke and its microstructure. The oxidative combustion of the coke is started from the micropores of the coke, and the reduction of the microporosity reduces the oxidative combustion speed, the reactivity of the coke is naturally reduced, and the strength of the coke after reaction is naturally increased. The boric anhydride is used as the cosolvent of the white carbon black, so that the melting time of the siliceous components of the white carbon black is shortened, the siliceous components of the white carbon black can be effectively dissolved in quenching water, a layer of protective film is formed by adsorbing dissolved substances on the surface of coke after dehydration and crystallization in the quenching process, and microparticles of the boric anhydride and other components fully fill coke air holes, so that the reaction of carbon dioxide and the coke and the diffusion of the carbon dioxide into the coke are prevented, and under the high-temperature condition, the boric anhydride can effectively improve all the siliceous components in all the raw materials, improve the heat resistance and the mechanical strength of the raw materials, and can effectively reduce the. The tracking data of iron and steel enterprises using the enhancer of the invention for more than five consecutive years shows that the heat reactivity of coke can be effectively reduced by 1-2%, and the heat strength after reaction can be improved by 4-5%.

Detailed Description

The present invention will be described in detail with reference to examples.

The coke thermal structure enhancer provided by the embodiment comprises, by weight, 30% of boric anhydride, 30% of white carbon black, 15% of dolomite, 5% of titanium dioxide, 15% of silica powder and 5% of talc, wherein the main materials are boric anhydride B2O3 and white carbon black SiO 2. nH 2O; the coke thermal structure enhancer powder is obtained by ultrafine grinding various raw materials to a fineness of more than 500 meshes and uniformly stirring and mixing.

The using method comprises the following steps: the coke thermal structure enhancer powder is prepared into a solution with the coke weight ratio of 2 per mill by using quenching water with the temperature of 50-60 ℃, the solution is sprayed by a spray pipe of a coke quenching tower for quenching coke, the coke is uniformly sprayed and permeated during quenching coke, so that the coke is effectively filled in micropores on the coke surface, the coke is adsorbed on the coke surface to form a layer of protective film after dehydration and crystallization, partial particles fill coke pores, thereby preventing the reaction and the diffusion of carbon dioxide and the coke into the coke, effectively achieving the purposes of reducing the coke reactivity (the reactivity CRI of the coke can be reduced by 1-2%), improving the coke reaction strength (the thermal strength CSR is improved by 4-5%), decomposing along with the temperature rise, quickly achieving the purposes of inhibiting combustion and strengthening the structure of effective components, enhancing the skeleton action of the coke in a blast furnace, improving the air permeability and liquid permeability, and inhibiting the low-temperature reduction pulverization of iron-containing mineral, high-quality metallurgical coke with high strength is produced at low cost, so that the aim of increasing iron and saving coke in a blast furnace is fulfilled.

For the coke sprayed with the coke thermal structure enhancer solution, the reactivity and the strength after reaction are tested according to the national standard GB/T4000-1996, the CSR value is improved to different degrees, and the CRI and the coke powder (g) value with the reactivity of less than 10mm are also improved well. Meanwhile, the boric anhydride in the coke thermal structure enhancer raw material can generate a weak acid component with a certain concentration proportion after meeting water, and can be fully neutralized with ammonia water of a partial alkali component in the coke quenching water, so that the coke thermal structure enhancer has obvious capability of resisting and shielding the corrosion of ammonia and phenol components in the coke quenching water to metal, and meanwhile, a layer of crystalline substance can be attached to the surface of the metal after the micro powder of the feldspar and the talc in the coke thermal structure enhancer component is sprayed, so that the severe corrosion of the wet quenched coke water to the metal material can be effectively protected. The coke quenching car made of carbon steel material in the traditional wet coke quenching process has the average service life of about 10 months, can prolong 2-4 months after the quenching car is sprayed with the enhancer solution, and has different degrees of corrosion resistance on a spray pipe, a quenching track and the like.

The coke thermal structure enhancer of the present example was compared with the commercial conventional coke passivator product and the results are shown in table 1.

TABLE 1 comparative application test control Table

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, which is defined by the appended claims.