Quality appraisal of slag standing mill

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water slag vertical mill takes the synergy of roller grinding and classification screening as its core principle. By optimizing the grinding roller pressure, rotation speed and wear-resistant parts life, it achieves synergy between efficient grinding of blast furnace slag and fineness control of finished products. It is widely used in the field of slag resource utilization in the metallurgy, building materials and environmental protection industries. In the treatment of highly corrosive slag, it is used to achieve efficient preparation of slag powder; in large-scale production, it meets the requirements for continuous and stable operation and low energy consumption. Compared with traditional ball mill equipment, the water slag vertical mill has the characteristics of high grinding efficiency, strong sealing and dustproofing, and intelligent control. It is the core equipment for comprehensive utilization of slag.

As an authoritative organization for judicial filing, Zhongke Testing provides water slag vertical mill quality appraisal services. Relying on a team of mechanical engineering and material science experts and CMA and CNAS certified laboratories, Zhongke Testing issues legally binding technical reports on issues such as insufficient grinding efficiency, abnormal vibration and failure of wear-resistant parts.

With the improvement of slag grinding process requirements, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: the fineness of the finished product does not meet the standard, and the unit power consumption is abnormally high;

2, material defects: insufficient hardness of the wear-resistant layer of the grinding roller/grinding plate, and pressure resistance of the hydraulic cylinder seal Poor performance;

3, process problems: fluctuations in the powder selection efficiency of the grader, system air volume control deviation;

4, contract performance disputes: core modules (such as imported reducers, intelligent lubrication systems) are inconsistent with the technical agreement.

0 Such cases need to pass grinding efficiency testing, material composition verification and dynamic working condition simulation to clarify the quality responsibility.

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Hot blast furnace quality appraisal technical methods mainly include:

Water slag vertical mill quality appraisal requires systematic technical means:

1. Appearance inspection: observe the grinding roller groove depth, grinding disc liner cracks and sealing structure leakage;

2. Performance test: laser particle size analyzer detects finished product distribution, power The analyzer calculates the unit energy consumption;

3. Material analysis: the direct reading spectrometer detects the alloy composition of the grinding roller, and the scanning electron microscope observes the microscopic spalling morphology of the wear-resistant layer;

04, dynamic verification: continuous operation at full load to monitor vibration intensity and bearing temperature rise;

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25, safety assessment: overload protection response test and explosion-proof structure compliance verification.

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A steel plant of the applicant signed a "Slag Vertical Mill Purchase Contract" with an equipment manufacturer of the respondent, stipulating that the specific surface area of the finished product is ≥ 420m²/kg. After being put into production, the actual measurement was only 380m²/kg. The manufacturer argued that it was caused by the fluctuation of the slag composition.

Identification and analysis results:

The expert group found that: the alloy composition of the grinding roller did not meet the requirements of the agreement, the speed control of the classifier deviated, and the system air volume did not meet the design specifications.

The appraisal conclusion determined that defects in material composition and process control were the main causes of performance failure.

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Water slag vertical mill quality appraisal report should include:

1, appraisal purpose and reference standards;

2, involved equipment model, technical agreement and operation log;

3, detection method and equipment list;

4, test data and failure correlation analysis;

05, clarify the quality responsibility determination conclusion and technical basis;

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26, signature of the appraiser, mechanical engineer qualification certificate and official seal of the organization.

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