How to calculate the recoverable value of discarded sheet metal

Introduction to Calculating the Recoverable Value of Metals in Discarded Boards

The recoverable value of metals present in discarded boards depends on the metal composition, element content and recovery methods applied. Accurate calculation is essential for efficient e-waste management and alignment with current environmental legislation.

Metallic Composition of Discarded Boards

Discarded boards contain precious and non-precious metals such as gold, silver, copper, tin, nickel and palladium. The content of each metal is determined using certified laboratory analyses, such as X-ray fluorescence spectrometry (XRF) and acid digestion followed by atomic absorption spectrometry (AAS).

Methodologies for Evaluating Metal Content

To calculate the recoverable value, the total sample weight of the discarded plates must first be identified. Subsequently, the metal content expressed as a percentage by mass is quantified. The process includes representative sampling, sample preparation and quantitative analysis of the metallic elements.

Recoverable Value Calculation

The calculation involves multiplying the sample weight by the metal content (in decimal fraction) for each metal separated. Then the typical yield of the recovery process is applied, which varies according to the technology employed. For example:

Recoverable value (kg) = Sample weight (kg) × metal content (%) × process yield (%)

This calculation must be carried out for each recoverable metal, considering average recovery rates for each available technology.

Legal and Regulatory Aspects

The process of calculating and recovering metals is supported by legislation such as the National Solid Waste Policy (Law no. 12.305/2010), which establishes guidelines for the responsible management of waste, including electronic waste, and encourages the recovery of materials through reuse, recycling and reclamation.

According to National Solid Waste Management Information System (SINIR), it is essential to record and control the quantities and types of waste treated, reinforcing the importance of monitoring the recoverable value.

Importance of Proper Disposal

The correct management of electronic waste avoids environmental impacts and guarantees the economic recovery of valuable metals. For reverse logistics and qualified collection, it is recommended to schedule specialized e-waste collection, which ensures proper disposal.

Secure Destruction of Sensitive Media

In the case of electronic storage, degaussing and secure destruction of media such as hard drives is recommended to protect sensitive data. The service can be scheduled to ensure compliance with security policies, as available at hard drive disposal and sanitization.

Conclusion

Calculating the recoverable value of metals contained in discarded plates requires precise laboratory analysis, application of the correct quantification methodology and evaluation of the recovery process yield rates. Compliance with legal regulations and the use of specialized services are essential in order to maximize efficiency and ensure sustainability in the management of electronic waste.