The circulating water system in the process of steel production undertakes the key tasks of cooling equipment, conveying media and maintaining process stability, and its water quality directly affects production efficiency and equipment life. With the increasingly stringent environmental regulations on industrial wastewater discharge standards, efficient water treatment technology has become the core element of sustainable development of steel mills. The shallow sand filter and bag filter developed by Henan Xinxiang Lifelte Filter Co., Ltd. provide innovative solutions for circulating water purification in steel mills with their structural optimization and intelligent control characteristics.
Circulating water in steel mills often contains suspended particles (such as iron oxide, oil stains), dissolved salts and microbial communities. If these impurities are not effectively removed, they will lead to pipe blockage, heat exchange efficiency reduction, and even corrosion of production equipment. Traditional treatment methods (such as chemical precipitation, single filtration) have disadvantages such as high energy consumption and frequent maintenance. Therefore, the development of water treatment systems with both high precision filtration and low energy consumption has become the focus of technological upgrading in the industry. Shallow sand filter: Efficient interception and automatic backwashing mechanism Liefert shallow sand filter adopts multi-layer quartz sand filter bed structure, through the step by step filtration principle to achieve micron level impurity interception. Its core technical advantages include: modular design, a single filtration unit diameter of only 1.2m, can be extended in parallel combination to hundreds of tons/hour processing capacity, to adapt to different scale of water recycling systems in steel mills. Intelligent backwash system, built-in differential pressure sensor, when the filter bed pressure difference exceeds the set threshold, automatically start the reverse flow cleaning, without manual intervention, maintenance costs reduced by 30%. Corrosion resistant material, filter tank made of 316L stainless steel, withstand high temperature (≤80℃) and acid and alkali corrosion, extend the service life of equipment. Bag filter: Precision filtration and flexible adaptation For suspended solids and colloidal particles below the micron level in circulating water, Lifeldt bag filters achieve deep purification through customized bag aperture (up to a minimum of 1μm). Its innovation point is: the filter bag replacement is convenient, quick opening structure design, a single person to complete the filter bag replacement within 5 minutes, reduce downtime. Pressure difference warning function, real-time monitoring of the inlet and outlet pressure difference, automatic alarm when the filter bag is blocked, to avoid production accidents caused by filter failure. Multi-media compatibility, can be adapted to oily wastewater, acid and alkali solution and other different water quality, suitable for steel mill rolling, hardening and other processes. A large steel mill deployed shallow sand filters and bag filters in series in the cooling water circulation system to form a two-stage treatment mode of "pre-filtration - fine filtration". The measured data showed that the removal rate of total suspended solids (SS) increased from 65% to 98%. The heat exchanger scaling rate is reduced by 70%, and the cleaning cycle is extended by 4 times. The annual water saving cost reached 1.2 million yuan, and the frequency of equipment maintenance was reduced by 50%. This case demonstrates the overall effect of the dual filtration system on the quality of circulating water in a steel mill, while the automation characteristics of Lifeldt products significantly reduce the burden of human operation and maintenance. Technology Outlook and Localized Service advantages With the advancement of intelligent manufacturing by Industry 4.0, Lifeldt Filter Company has integrated the Internet of Things technology into the filter system to achieve remote monitoring and fault diagnosis. Its production base in Xinxiang, Henan Province, can quickly respond to the customized needs of steel mills in North China, providing a full cycle of service from scheme design to after-sales maintenance. In the future, the company plans to develop integrated filtration equipment to further reduce footprint and improve processing energy efficiency. The combination of shallow sand filter and bag filter provides an efficient and economical solution for circulating water treatment in steel mills. Henan Xinxiang Lifelte Filter Co., LTD., through technological innovation and localization services, help the steel industry to achieve a balance between environmental compliance and production efficiency, and promote industrial water treatment technology to a new stage of intelligence and sustainability.
