Quality appraisal of cement solidification equipment

cement solidification device is the core equipment for the harmless treatment of hazardous waste. By mixing hazardous waste with cement and additives, a stable solidified body is formed to prevent the leaching of harmful substances such as heavy metals. Cement solidification equipment is used in industries such as chemical industry, metallurgy, nuclear industry, and municipal engineering.

Compared with other curing technologies (such as asphalt curing, chemical agent curing), cement curing equipment occupies a dominant position in the field of hazardous waste treatment due to its low cost, mature technology, and strong adaptability. It is an important technical support for achieving the goal of "waste-free city".

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

As environmental protection policies become stricter, the number of quality disputes involving cement curing equipment has gradually increased. The judicial dispute focuses on:

1, whether the equipment meets the contracted compressive strength of the solidified body (such as ≥5MPa), leaching toxicity compliance rate (such as lead ≤0.25mg/L) and other indicators;

2, whether there are any problems due to uneven mixing, Cracks and leaks of the solidified body caused by insufficient curing conditions;

3. Whether the control system is stable and reliable, and whether key parameters (such as cement content and moisture content) can be monitored in real time;

4. The correlation between quality problems, environmental pollution accidents, and economic losses.

The technical methods for quality appraisal of cement curing equipment include:

1, appearance and structural inspection

Check whether the mixing tank material (such as carbon steel lined with rubber, stainless steel 316L) meets the corrosion resistance requirements, and whether there is wear and corrosion on the surface. Check whether the mixing blade angle and speed are adjustable, and verify the mixing uniformity design (such as speed deviation ≤ ±5%).

2, solidified body performance test

The compressive strength of the solidified body specimen is tested to verify whether it reaches the design value. Carry out leaching toxicity tests to detect the leaching concentrations of heavy metals (lead, cadmium, chromium) and other harmful substances.

0 simulates material flow fluctuations, cement supply interruption and other working conditions, and tests the automatic adjustment and alarm function response time (≤3 seconds). Check the human-machine interface parameter setting permission management to prevent unauthorized modification of process parameters.

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26, environmental adaptability assessment

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4 Test the operating stability of the equipment in a high-humidity, dusty environment to evaluate the sealing performance. Analyze the efficiency of the exhaust gas treatment system and detect whether dust and odor emissions comply with environmental standards.

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67, on-site operation and maintenance assessment

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8Check the operator training records to determine whether the equipment is started, stopped, and maintained in accordance with the regulations. Analyze maintenance logs to evaluate whether the lubrication system and filter devices are replaced regularly.

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The applicant, a hazardous waste treatment company, signed a "Cement Solidification Equipment Procurement Contract" with an environmental protection equipment company, the respondent, and agreed to purchase 2 sets of equipment with model number EL-1200. After the equipment was put into production, large-scale cracks appeared in the solidified body, and the leaching toxicity test showed that the lead concentration reached 0.8mg/L (standard ≤0.25mg/L), which led to the landfill rejecting it. The disposal company believed that the equipment had a design defect and demanded compensation for losses. The equipment company argued that the problem was caused by the complex composition of hazardous waste or improper operation, and both parties filed suit in court. The court entrusted a third-party appraisal agency to conduct quality appraisal of the equipment involved in the case.

identification analysis results:

The quality analysis expert group discussed and synthesized technical data on the "cement solidification device" related information, contract technical agreements, on-site investigation case materials and other data Analysis, the following quality analysis opinions were made:

The rubber lining of the mixing tank of the cement curing device involved in the case had insufficient corrosion resistance and was not replaced regularly; a chloride ion neutralization system was not configured, and the mixing blades had poor wear resistance; the cement dosage monitoring accuracy was insufficient, and the maintenance time was forced to be skipped.

The equipment company's failure to provide compliant equipment and processing systems as stipulated in the contract is the fundamental cause of quality problems in the cement curing equipment.

The cement curing device quality appraisal report should include the following contents:

1, appraisal purpose

2, appraisal entrusting unit

3, basic equipment information

4, appraisal technology Technical method