Mill quality appraisal

The

mill takes the synergy of high-energy grinding and classification control as its core principle. By optimizing the grinding disc pressure, rotor speed and classification accuracy, it achieves the synergy of material fineness, output and energy consumption. It is widely used in the field of fine processing of non-metallic mineral powders, metallurgical powders and chemical raw materials. In the building materials industry, it is used for the efficient preparation of cement raw materials and mineral powder; in the coating field, it meets the ultra-fine dispersion requirements of titanium dioxide and kaolin; in new energy materials, it ensures the particle size consistency of graphite anode materials. Compared with traditional ball mills, grinding mills have the characteristics of high grinding efficiency, long wear-resistant life, and intelligent control (online particle size feedback adjustment). They are the core equipment for the upgrading of the powder industry.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide mill quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for mill quality appraisal.

As the demand for refinement in the powder market grows, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: the fineness of the finished product is not up to standard, and the output is false;

2, material defects: insufficient hardness of the alloy layer of the grinding roller, broken teeth of the reducer gear;

3, process problems: graded wheel balance deviation, hydraulic system pressure fluctuation%;

4, contract performance dispute: core modules (such as imported bearing brands, intelligent control system versions) are inconsistent with the technical agreement.

0 Such cases require powder property analysis, material failure verification and dynamic performance testing to clearly define quality responsibility.

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Mill litigation quality appraisal mainly includes the following technical methods:

1. Performance index appraisal

includes the detection and analysis of production capacity, energy consumption, particle size distribution and other indicators. Use flow meters, electric energy meters, laser particle size analyzers and other equipment for testing.

2. Processing quality identification

mainly evaluates the fineness, uniformity, impurity content, etc. of the finished powder. Laser particle size analyzer, scanning electron microscope, X-ray diffractometer and other equipment are used for detection.

03. Safety and reliability appraisal

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2 Check whether the structure, materials, safety devices, etc. of the grinding mill comply with relevant standards and specifications. Evaluation is carried out using visual inspection, electrostatic measurements, vibration testing and other methods.

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The applicant, a mining company, and the defendant, an equipment manufacturer, signed a "Vertical Mill Purchase Contract", agreeing that D97 ≤ 15 μm. After being put into production, the median diameter of the finished product reached 25 μm. The manufacturer argued that it was caused by fluctuations in the hardness of the raw materials.

identification analysis results:

The quality analysis expert group discussed the relevant information of the "pulverizer", the contract technical agreement, on-site inspection case materials and other data and comprehensive technical analysis, and made the following quality analysis opinions:

The actual grinding roller pressure of the mill involved in the case is only 8MPa (agreement ≥ 10MPa), the classification wheel speed deviation is ±15% (agreement ±5%); the hardness of the grinding disc alloy layer is HRC 58 (protocol ≥ 62), the wear rate exceeds the protocol value by 3 times.

The appraisal conclusion determined that defects in the hydraulic system and materials were the main reasons for the excessive fineness.

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Mill quality appraisal report should include:

1, appraisal purpose (such as attribution of performance disputes, contract compliance verification) and reference standards;

2, equipment model involved, control system version, operation and maintenance records;

3, detection method and equipment list (such as laser particle size analyzer, vibration analyzer);

4, correlation analysis between test data and failure (such as the impact of grinding roller pressure on fineness);

05,clear quality responsibility judgment conclusion and technical basis;

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

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