转炉钢渣处理技术优化
发布时间：2019-02-13 10:57
【摘要】：转炉仍是国内主要的炼钢方式,按照吨钢100-150kg钢渣来考虑,每年的炼钢渣产量超过8000万吨。钢渣作为工业废渣,若不能得到及时有效处置,将造成资源浪费,甚至造成环境污染。国内许多钢企建设了不同配置的生产线处理钢渣以回收利用钢渣中铁质资源,既降低了生产成本,又保护了环境,提高了资源的利用率。山东某钢厂现有钢渣综合处理利用的处理工艺包括一次预处理、整粒加工处理、渣钢自磨处理、湿磨湿选处理、微粉处理。该厂一次预处理工艺采用闷渣处理,方面水汽化过程使得钢渣降温,另一方面,采用蒸汽消解钢渣的膨胀性。钢渣的整粒加工处理由破碎、筛分、磁选等工序组成。本课题主要是针对该厂现有钢渣综合处理生产线,尤其是一次预处理生产线和整粒加工生产线中存在的问题进行设计优化,并提出技术方案。主要研究内容如下：1.闷渣过程中产生大量蒸汽,弥散在周围空气中,尤其在冬季等气温较低的季节,这种情况尤为严重,使整个车间能见度大大降低,存在安全隐患。针对此问题,本文利用闷渣坑底部的冲渣沟作为蒸汽减速沉降室的方式解决蒸汽污染问题。该工艺是将闷渣蒸汽排入冲渣沟,蒸汽外排的通道面积瞬时扩大了接近35倍,蒸汽的流速相应地快速降低,造成了蒸汽中尘埃的加速沉降,同时促进蒸汽的凝结,沉降的尘埃和蒸汽凝结水通过冲渣沟内冲渣水汇入闷渣生产线的沉淀池,达到了闷渣蒸汽的降速除尘及凝水回收的工艺效果。2.闷渣过程中大量蒸汽散失,使得闷渣过程需不断补充新水,造成水资源的消耗和能量浪费。本文中的蒸汽回收利用技术方案解决了闷渣过程水资源浪费、能量浪费问题。本技术在原有闷渣工程的基础上进行改造即可实现,施工简单、费用低,便于工程化推广；将钢铁厂的余热进行居民采暖,不仅解决了周边居民的采暖问题,还可解决居民采暖消耗燃煤、环保等一系列问题,节约社会资源,同时可为钢铁厂创造额外效益。3.经整粒加工处理后钢渣中磁性物质(废钢、磁性粉等)选出效率不高、非磁性渣粒度和含铁量不能满足下道工序要求。本文通过对破碎工艺、筛分工艺、磁选工艺的研究,优化整粒加工工艺流程,实现降低项目投资、生产运行成本,以及减少占地的目的。
[Abstract]:Converter is still the main steelmaking method in China. According to the 100-150kg steel slag, the annual output of steelmaking slag is more than 80 million tons. Steel slag, as industrial waste slag, will cause waste of resources and even environmental pollution if it can not be disposed in time and effectively. Many domestic steel enterprises have constructed different production lines to deal with steel slag in order to recover and utilize the iron resources in steel slag, which not only reduces the production cost, but also protects the environment, and improves the utilization ratio of the resources. The existing comprehensive treatment technology of steel slag in a steel plant in Shandong province includes single pretreatment, whole grain processing, slag steel self-grinding, wet grinding and wet dressing, and micro-powder treatment. The steel slag is cooled by water vaporization, and the expansion of steel slag is digested by steam on the other hand. The whole grain processing of steel slag consists of crushing, screening, magnetic separation and so on. This subject is mainly aimed at the problems existing in the existing steel slag comprehensive treatment production line, especially in the primary pretreatment production line and the whole grain processing line, and puts forward the technical scheme. The main contents are as follows: 1. A large amount of steam is produced in the process of smashing, which is dispersed in the surrounding air, especially in the low temperature seasons such as winter. This situation is especially serious, which greatly reduces the visibility of the whole workshop and has a hidden danger of safety. In order to solve this problem, this paper solves the problem of steam pollution by using the scouring ditch at the bottom of the slagging pit as the settling chamber of steam deceleration. In this process, the slag stuffing steam is discharged into the slag flushing ditch, the passage area of the steam outlet increases by nearly 35 times, and the flow velocity of the steam decreases rapidly, which results in the accelerated deposition of the dust in the steam and the condensation of the steam at the same time. The precipitated dust and steam condensate water is condensed into the sedimentation tank of the production line through the dregs flushing water in the slag flushing ditch, and the technological effect of dedusting and condensing water recovery of the smoldering steam is achieved. 2. A large amount of steam is lost in the process of slag stuffing, which makes it necessary to continuously replenish new water, resulting in the consumption of water resources and the waste of energy. The technical scheme of steam recovery and utilization in this paper solves the waste of water resources and energy in the process of slagging. The technology can be realized on the basis of the original slag stuffing project, the construction is simple, the cost is low, and the project is easy to be popularized. Heating the waste heat in the steel plant not only solves the heating problem of the surrounding residents, but also solves a series of problems, such as burning coal, environmental protection and so on, saves social resources, and can create additional benefits for the steel plant at the same time. The selection efficiency of magnetic material (scrap, magnetic powder, etc.) is not high after the whole grain processing, and the grain size and iron content of non-magnetic slag can not meet the requirements of the next working procedure. Through the research of crushing technology, screening technology and magnetic separation technology, this paper optimizes the whole grain processing process, realizes the purpose of reducing project investment, production and operation cost, and reducing the occupation of land.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X757
本文编号：2421481
[Abstract]:Converter is still the main steelmaking method in China. According to the 100-150kg steel slag, the annual output of steelmaking slag is more than 80 million tons. Steel slag, as industrial waste slag, will cause waste of resources and even environmental pollution if it can not be disposed in time and effectively. Many domestic steel enterprises have constructed different production lines to deal with steel slag in order to recover and utilize the iron resources in steel slag, which not only reduces the production cost, but also protects the environment, and improves the utilization ratio of the resources. The existing comprehensive treatment technology of steel slag in a steel plant in Shandong province includes single pretreatment, whole grain processing, slag steel self-grinding, wet grinding and wet dressing, and micro-powder treatment. The steel slag is cooled by water vaporization, and the expansion of steel slag is digested by steam on the other hand. The whole grain processing of steel slag consists of crushing, screening, magnetic separation and so on. This subject is mainly aimed at the problems existing in the existing steel slag comprehensive treatment production line, especially in the primary pretreatment production line and the whole grain processing line, and puts forward the technical scheme. The main contents are as follows: 1. A large amount of steam is produced in the process of smashing, which is dispersed in the surrounding air, especially in the low temperature seasons such as winter. This situation is especially serious, which greatly reduces the visibility of the whole workshop and has a hidden danger of safety. In order to solve this problem, this paper solves the problem of steam pollution by using the scouring ditch at the bottom of the slagging pit as the settling chamber of steam deceleration. In this process, the slag stuffing steam is discharged into the slag flushing ditch, the passage area of the steam outlet increases by nearly 35 times, and the flow velocity of the steam decreases rapidly, which results in the accelerated deposition of the dust in the steam and the condensation of the steam at the same time. The precipitated dust and steam condensate water is condensed into the sedimentation tank of the production line through the dregs flushing water in the slag flushing ditch, and the technological effect of dedusting and condensing water recovery of the smoldering steam is achieved. 2. A large amount of steam is lost in the process of slag stuffing, which makes it necessary to continuously replenish new water, resulting in the consumption of water resources and the waste of energy. The technical scheme of steam recovery and utilization in this paper solves the waste of water resources and energy in the process of slagging. The technology can be realized on the basis of the original slag stuffing project, the construction is simple, the cost is low, and the project is easy to be popularized. Heating the waste heat in the steel plant not only solves the heating problem of the surrounding residents, but also solves a series of problems, such as burning coal, environmental protection and so on, saves social resources, and can create additional benefits for the steel plant at the same time. The selection efficiency of magnetic material (scrap, magnetic powder, etc.) is not high after the whole grain processing, and the grain size and iron content of non-magnetic slag can not meet the requirements of the next working procedure. Through the research of crushing technology, screening technology and magnetic separation technology, this paper optimizes the whole grain processing process, realizes the purpose of reducing project investment, production and operation cost, and reducing the occupation of land.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X757
【引证文献】
相关会议论文 前1条
1 赵爱新;宋青伟;黄炳仁;史胜利;刘福运;梁成金;;钢渣处理技术及钢渣粉的综合应用[A];济南市2005年学术年会论文集[C];2005年
，本文编号：2421481
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