简析氧化球团回转窑如何突破耐火材料瓶颈A Brief Analysis of How Rotary Kilns for Oxidation Pelletizing Can Overcome Bottlenecks in Refractory Materials

2025年钢铁行业"双碳"目标进入攻坚期，氧化球团作为高炉炼铁优质原料，其生产装备的节能改造迫在眉睫。但链篦机-回转窑系统中，传统耐火材料平均寿命仅8-12个月，每年因停窑检修造成的产能损失高达30万吨/线。河南宏达炉业研发的高铝莫来石预制砖，通过技术结构设计使窑衬寿命突破24个月，在山西钢铁130万吨球团项目中实现年减少检修费用460万元。这一技术突破如何重构行业成本结构？

The steel industry's "dual carbon" targets for 2025 are entering a critical phase, making energy-saving upgrades to production equipment for oxidized pellets, a high-quality raw material for blast furnace iron making, an urgent necessity. However, in chain grate-rotary kiln systems, the average lifespan of traditional refractory materials is only 8-12 months, resulting in annual capacity losses of up to 300,000 tons per line due to kiln shutdowns for maintenance. Henan Hongda Furnace Industry's high-alumina mullite precast bricks, through technical structural design, have extended the kiln lining lifespan to over 24 months, achieving an annual reduction of 4.6 million yuan in maintenance costs in Shanxi Steel's 1.3 million-ton pelletizing project. 

1 行业困局：耐火材料成氧化球团产能释放短板

1 How can this technological breakthrough restructure the industry's cost structure?

我国氧化球团产量2025年预计达1.48亿吨，但回转窑内衬损耗始终制约生产连续性。冶金工业规划研究院数据显示，链篦机-回转窑工艺中，耐火材料占设备维护成本的37%，其中烧成带砖体年磨损量达15-20mm。某钢铁集团测算表明，每延长窑衬寿命1个月可增加经济效益38万元。

my country's oxidized pellet production is projected to reach 148 million tons by 2025, but the wear and tear of rotary kiln linings continues to constrain production continuity. Data from the Metallurgical Industry Planning and Research Institute shows that in the chain grate-rotary kiln process, refractory materials account for 37% of equipment maintenance costs, with the annual wear of bricks in the firing zone reaching 15-20 mm. A steel group's calculations indicate that extending the kiln lining life by one month can increase economic benefits by 380,000 yuan.

传统耐火材料面临三重挑战：

热震损伤：窑内1150-1180℃高温与频繁启停造成砖体开裂，某项目统计热震裂纹率达23%

物料冲刷：含铁原料对窑衬的年磨损量相当于砖体厚度的12%

施工效率：传统砌筑工艺单窑施工需28天，远超行业15天的检修窗口要求

Traditional refractory materials face three major challenges:

Thermal shock damage: High temperatures of 1150-1180℃ inside the kiln and frequent start-ups and shutdowns cause brick cracking; one project's statistics show a thermal shock crack rate of 23%.

Material erosion: The annual wear of iron-containing raw materials on the kiln lining is equivalent to 12% of the brick thickness.

Construction efficiency: Traditional masonry techniques require 28 days to complete a single kiln construction, far exceeding the industry standard of a 15-day maintenance window.

2 技术突破：宏达预制砖的三维解决方案

河南宏达炉业作为我国级专精特新小巨人企业，依托131项技术（含9项发明技术），开发出适应氧化球团回转窑的模块化预制砖系统。其核心创新点在于：

2. Technological Breakthrough: Hongda Precast Brick's Three-Dimensional Solution

Henan Hongda Furnace Industry, a national-level specialized and innovative small giant enterprise, has developed a modular precast brick system adapted to rotary kilns for oxidation pelletizing, based on 131 technologies (including 9 invention technologies). Its core innovation lies in:

Material formulation revolution

采用刚玉莫来石复相结构，Al₂O₃含量≥65%，常温耐压强度达85MPa，较传统高铝砖提升42%。通过添加红柱石微粉（技术号CN212409362U），将热震稳定性（1100℃水冷）提高至35次，超过行业标准52%。

It adopts a corundum-mullite multiphase structure with an Al₂O₃ content of ≥65% and a room temperature compressive strength of 85MPa, which is 42% higher than that of traditional high-alumina bricks. By adding andalusite micro powder (technical number CN212409362U), the thermal shock stability (1100℃ water cooling) is increased to 35 cycles, exceeding the industry standard by 52%.

Structural design optimization

自有Z字形子母曲风槽和预埋金属锚固系统，使单块预制砖抗折强度提升28%。山西钢铁项目应用显示，该结构使窑衬整体刚性提高，径向变形量控制在0.8mm/m以内。

The proprietary Z-shaped mother-and-child curved air duct and pre-embedded metal anchoring system increase the flexural strength of a single precast brick by 28%. Application in the Shanxi Iron and Steel project shows that this structure improves the overall rigidity of the kiln lining, controlling radial deformation to within 0.8 mm/m.

施工工艺创新

采用分片预制+螺栓固定的安装方式，将施工周期压缩至12天。配套开发的专用耐火泥（Al₂O₃≥75%）实现常温固化，省去传统烘窑工序，直接节省燃料成本18万元/窑。

Innovative Construction Technology

The installation method, which combines prefabrication in sections with bolt fixing, reduces the construction period to 12 days. The specially developed refractory mortar (Al₂O₃≥75%) achieves room temperature curing, eliminating the traditional kiln drying process and directly saving 180,000 yuan per kiln in fuel costs.

实证数据：从实验室到工业现场的验证

Empirical data: Validation from the laboratory to the industrial field

工程案例

山西钢铁130万吨/年氧化球团项目（2021年投产）：

窑衬寿命：从11个月延长至24个月

年检修次数：从2次减少至1次

吨球团耐火材料成本：从12.6元降至8.3元

累计节约成本：1720万元（截至2025年6月）

Project Case Study

Shanxi Iron & Steel's 1.3 million tons/year Oxidized Pelletizing Project (commissioned in 2021):

Kiln lining life: extended from 11 months to 24 months

Annual maintenance frequency: reduced from 2 times to 1 time

Refractory material cost per ton of pellets: reduced from 12.6 yuan to 8.3 yuan

Cumulative cost savings: 17.2 million yuan (as of June 2025)

选型建议：不同工况下的材料适配方案

Selection Recommendations: Material Adaptation Solutions for Different Working Conditions

作为氧化球团回转窑耐火材料我国标准参与制定单位，宏达炉业可提供从材料选型、施工指导到寿命评估的全周期服务。2025年新推出的"窑衬健康监测系统"，通过植入温度传感器实现剩余寿命预测，使维护决策准确率提升至92%。

在钢铁工业绿色转型的关键期，选择适配的耐火材料系统已成为氧化球团生产线降本增效的核心抓手。宏达炉业20余年的行业积淀，正在通过技术创新重新定义高温工业窑炉的效能边界。

As a participant in the formulation of national standards for refractory materials for rotary kilns used in oxidation pelletizing, Hongda Furnace Industry provides full-cycle services, from material selection and construction guidance to lifespan assessment. The newly launched "Kiln Lining Health Monitoring System" in 2025, through the implantation of temperature sensors, predicts remaining lifespan, increasing the accuracy of maintenance decisions to 92%.

During the critical period of green transformation in the steel industry, selecting suitable refractory material systems has become a core strategy for cost reduction and efficiency improvement in oxidation pelletizing production lines. Hongda Furnace Industry's more than 20 years of industry experience is redefining the efficiency boundaries of high-temperature industrial kilns through technological innovation.