阅读说明：本技术 一种炼铁高炉热熔渣加电弧炉生产岩矿棉制品的工艺 (process for producing rock and mineral wool products by using hot molten slag of iron-making blast furnace and electric arc furnace ) 是由 张述钧 于 2018-05-29 设计创作，主要内容包括：本发明提供了一种炼铁高炉热熔渣加电弧炉生产岩矿棉制品的工艺,包括以下步骤：在渣包接渣过程中同时加入石英砂尾矿,利用下渣过程中冲击力及高炉渣的热量对石英砂进行部分熔融；将粉煤灰通过气体喷吹的方法输送到电炉熔渣内,进行快速熔融；添加石英砂及少量镁质调质料；提高电弧炉电流,通过高电流和氮气搅拌进行搅拌,使调质料达到充分的熔化和成分的均化；将渣包熔渣倒入到电弧炉中,通过氮气搅拌使刚倒入的熔渣和炉体内提供的熔渣进行充分熔融；提高电流,通过电弧炉电流产生的电流环进行搅拌,使熔渣进一步均化。本发明不仅开辟了高炉渣利用的新途径,提高了高炉渣利用的附加值,而且可以重新高附加值地利用粉煤灰。(The invention provides a process for producing rock and mineral wool products by adding hot molten slag of an iron-making blast furnace and an electric arc furnace, which comprises the following steps: adding quartz sand tailings in the slag ladle slag receiving process, and partially melting the quartz sand by using impact force in the slag discharging process and heat of blast furnace slag; conveying the fly ash into electric furnace slag by a gas injection method for rapid melting; adding quartz sand and a small amount of magnesium conditioning material; the current of the electric arc furnace is increased, and the high current and nitrogen stirring are carried out to ensure that the quenched and tempered material is fully melted and the components are homogenized; pouring slag ladle slag into an electric arc furnace, and fully melting the just poured slag and the slag provided in the furnace body through nitrogen stirring; the current is increased and the slag is further homogenized by stirring through a current loop generated by the current in the electric arc furnace. The invention not only opens up a new way for utilizing the blast furnace slag, improves the additional value of the utilization of the blast furnace slag, but also can utilize the fly ash with high additional value again.)

1. A process for producing rock and mineral wool products by using hot molten slag of an iron-making blast furnace and an electric arc furnace is characterized by comprising the following steps:

Adding high-fineness and high-silicon content quartz sand tailings in the slag ladle slag receiving process, and partially melting the quartz sand by using impact force and the heat of blast furnace slag in the slag discharging process;

conveying the fly ash into electric furnace slag by a gas injection method for rapid melting;

adding quartz sand and a small amount of magnesium conditioning material by using a screw feeder;

The current of the electric arc furnace is increased, and the high current and nitrogen stirring are carried out to ensure that the quenched and tempered material is fully melted and the components are homogenized;

Pouring slag ladle slag into an electric arc furnace, and fully melting the just poured slag and the slag provided in the furnace body through nitrogen stirring;

increasing current, stirring by a current loop generated by the current of the electric arc furnace to further homogenize the molten slag, raising the temperature to 1550 ℃, controlling the slag discharging temperature to 1400 ℃, controlling the viscosity coefficient to 0.8Pa.S, and controlling the acidity coefficient of the molten slag to be 1.6-1.8 after complete melting.

2. The process for producing rock and mineral wool products by using the hot molten slag of the iron-making blast furnace and the electric arc furnace as claimed in claim 1, wherein the process comprises the following steps: the addition amount of quartz sand in the slag ladle slag receiving process is 10 percent, and the slag discharging temperature of the blast furnace hot slag is over 1450 ℃.

3. the process for producing rock and mineral wool products by using the hot molten slag of the iron-making blast furnace and the electric arc furnace as claimed in claim 1, wherein the process comprises the following steps: conveying the fly ash into electric furnace slag by a nitrogen blowing method.

4. the process for producing rock and mineral wool products by using the hot molten slag of the iron-making blast furnace and the electric arc furnace as claimed in claim 1, wherein the process comprises the following steps: the addition amount of the fly ash is 10-15%.

5. The process for producing rock and mineral wool products by using the hot molten slag of the iron-making blast furnace and the electric arc furnace as claimed in claim 1, wherein the process comprises the following steps: the quartz sand is added into the screw feeder in an amount of 10-20%.

Technical Field

the invention relates to the field, in particular to a process for producing rock and mineral wool products by using hot slag of an iron-making blast furnace and an electric arc furnace.

Background

With the rapid development of steel production in China, the total amount of generated solid waste is more and more, wherein the blast furnace slag accounts for about 50 percent, is a silicate material with good performance, and has great potential for fully and scientifically utilizing the good blast furnace slag.

At present, most steel plants in China treat blast furnace slag by a water quenching method, and the treatment mode not only consumes a large amount of water, but also wastes a large amount of heat energy. The invention prepares mineral wool fiber by adding proper amount of coal ash, silica and other quenching and tempering materials into the blast furnace hot slag and passing through a high-speed centrifuge, and produces different products through a production line, thereby not only opening up a new way for utilizing blast furnace slag, improving the additional value of blast furnace slag utilization, but also utilizing the coal ash with high additional value again. Therefore, the development of the key technologies of preparing the slag fiber by using the blast furnace hot slag and the fly ash and utilizing the waste heat is an innovative project in the fields of resource and energy recycling and reutilization.

Blast furnace slag produced in the blast furnace iron-making process of large iron and steel enterprises in China at present has low acidity coefficient, generally between 0.9 and 1.0, according to the requirements of national standards, the acidity coefficient of mineral wool products is between 1.1 and 1.5, the acidity coefficient of rock wool products is above 1.5, the acidity coefficient of exterior wall rock wool boards for buildings in Shandong province must be above 1.7, and how to improve the acidity coefficient of blast furnace hot slag becomes a key problem.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a process for producing rock and mineral wool products by adding an electric arc furnace to hot blast furnace slag, mineral wool fibers are prepared by adding a proper amount of quenching and tempering materials such as fly ash, silica and the like into the hot blast furnace slag through a high-speed centrifuge, and different products are produced through a production line, so that a new way for utilizing the blast furnace slag is developed, the additional value of the utilization of the blast furnace slag is improved, and the fly ash can be utilized again with high additional value.

The aim of the invention is achieved by the following technical measures:

a process for producing rock and mineral wool products by using hot slag of an iron-making blast furnace and an electric arc furnace comprises the following steps:

Adding high-fineness and high-silicon content quartz sand tailings in the slag ladle slag receiving process, and partially melting the quartz sand by using impact force and the heat of blast furnace slag in the slag discharging process;

Conveying the fly ash into electric furnace slag by a gas injection method for rapid melting;

adding quartz sand and a small amount of magnesium conditioning material by using a screw feeder;

The current of the electric arc furnace is increased, and the high current and nitrogen stirring are carried out to ensure that the quenched and tempered material is fully melted and the components are homogenized;

pouring slag ladle slag into an electric arc furnace, and fully melting the just poured slag and the slag provided in the furnace body through nitrogen stirring;

Increasing current, stirring by a current loop generated by the current of the electric arc furnace to further homogenize the molten slag, raising the temperature to 1550 ℃, controlling the slag discharging temperature to 1400 ℃, controlling the viscosity coefficient to 0.8Pa.S, and controlling the acidity coefficient of the molten slag to be 1.6-1.8 after complete melting.

Furthermore, the addition amount of quartz sand in the slag ladle slag receiving process is 10%, and the slag discharging temperature of the blast furnace hot slag is above 1450 ℃.

Further, the fly ash is conveyed into the electric furnace slag by a nitrogen injection method.

further, the addition amount of the fly ash is 10-15%.

Furthermore, the adding amount of the quartz sand is 10-20%.

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

if the adding amount of the silica exceeds 10 percent, incrustation occurs, the viscosity coefficient is increased, the melting time is long, stirring cannot be realized, and the normal production is difficult. The rapid melting and component homogenization of the conditioning material are realized through the characteristics of the staged and partial addition of the silica, the high fluidity of the fly ash and the like, the current and nitrogen stirring, the fluidity of the molten slag fully meets the fiber forming requirement, the produced rock and mineral cotton meets the national standard and the quality requirement of customers, and various indexes of the rock and mineral cotton plate produced by utilizing the blast furnace hot slag charging furnace meet the national standard requirement through the verification of the quality supervision, inspection and test center of the building engineering in Shandong province.

The invention mainly utilizes the addition process of the materials such as the fly ash, the silica and the like to make the blast furnace hot slag and the electric arc furnace melt, preserve heat, homogenize and other processes to produce rock mineral wool products which meet the national standard and the requirements of customers on quality. The method is a novel technology and a novel process for energy conservation and emission reduction, which are pioneering both at home and abroad, and has profound social significance for improving the utilization efficiency of wastes, fully utilizing waste energy, promoting the harmonious development of economy, society and human and nature in China and realizing the leap of resource economy to circular economy.

Detailed Description

and (3) adding high-fineness and high-silicon content quartz sand tailings in the slag ladle slag receiving process, wherein the adding amount of quartz sand is 10%, and the slag discharging temperature of the blast furnace hot slag is over 1450 ℃. Partially melting the quartz sand by using impact force in the slag discharging process and heat of blast furnace slag;

Conveying 10-15% of fly ash into electric furnace slag by a nitrogen blowing method, and rapidly melting;

adding 10-20% of quartz sand and a small amount of magnesium conditioning material by using a screw feeder;

The current of the electric arc furnace is increased, and the high current and nitrogen stirring are carried out to ensure that the quenched and tempered material is fully melted and the components are homogenized;

pouring slag ladle slag into an electric arc furnace, and fully melting the just poured slag and the slag provided in the furnace body through nitrogen stirring;

Increasing current, stirring by a current loop generated by the current of the electric arc furnace to further homogenize the molten slag, raising the temperature to 1550 ℃, controlling the slag discharging temperature to 1400 ℃, controlling the viscosity coefficient to 0.8Pa.S, and controlling the acidity coefficient of the molten slag to be 1.6-1.8 after complete melting.

the acidity coefficient of the blast furnace hot slag can be effectively improved by using the fly ash and part of siliceous materials, and the viscosity coefficient of the tempered hot slag is 0.6-1.2Pa.S, thus completely meeting the technical requirements of fiber formation.