GB/T 47612-2026Greenhouse gases — Quantification method and requirements for the carbon footprint of products — Lime (English PDF)

4.1 Correlation

The data and methods selected are suitable for evaluating the GHG emissions generated by the quantified system.

4.2 Integrity

The carbon footprint quantification of quicklime products includes all direct and indirect emissions from the raw material production stage, the raw material transportation stage, and the product production stage.

The total emissions should be calculated to avoid double counting or omissions.

4.3 Consistency

Throughout the entire process of quantifying the carbon footprint of quicklime products, the same assumptions, methods, and data sources are used to obtain results consistent with the objectives and scope. The conclusion.

4.4 Uniformity

To improve the carbon footprint of quicklime products, internationally recognized methods, standards, and guidelines already applied to specific product categories will be adopted. Comparability.

4.5 Accuracy

The quantification of the carbon footprint of quicklime products is accurate, verifiable, relevant, and non-misleading, minimizing bias and uncertainty as much as possible. Qualitative analysis.

4.6 Transparency

Document all relevant issues using an open, comprehensive, and understandable method of information presentation. Disclose all relevant assumptions and, appropriately, the methods used. The methods and data sources.

This document quantifies the carbon footprint of quicklime at selected stages of its lifecycle, expressed in carbon dioxide equivalent (CO2e), based on this paper.

The purposes of conducting carbon footprint quantification include, but are not limited to, the following.

a) Used for communication of greenhouse gas emissions information between producers and upstream/downstream supply chains or consumers;

b) Used for producers to design and improve products to reduce their carbon footprint and for comparison with similar products;

c) Used for information exchange regarding product carbon footprint.

6.1 Product Description

Describe the product system and its functions according to the product standard corresponding to quicklime, and clearly describe the product name, product definition, and product implementation. Information such as standards, technical requirements, and application directions.

6.2 System Boundary

6.2.1 The system boundary for quantifying the carbon footprint of quicklime products includes the raw material production stage, the raw material transportation stage, and the product production stage, see [link to relevant documentation]. Figure 1.

6.2.2 The raw material and auxiliary material production stage begins with the extraction of primary resources from nature and ends when the raw materials and auxiliary materials arrive at the lime plant, including raw material production. (e.g., limestone mining), auxiliary material production (e.g., packaging material processing).

Note: Raw materials are materials that enter the product and are related to the product's function and performance; auxiliary materials are materials other than the main raw materials.

6.2.3 The raw material and auxiliary material transportation stage begins when the raw materials and auxiliary materials are transported from the place of origin and ends when they arrive at the lime plant.

6.2.4 The product production stage begins when the raw materials and auxiliary materials arrive at the lime plant and ends when the product leaves the factory, including. raw material preparation, fuel preparation, and calcination.

Burning system, finished product system, waste heat power generation, packaging and shipping, and in-plant transportation.

6.3 Declaration of Unit

The unit for quantifying the carbon footprint of quicklime products is "1 t quicklime for a specific purpose", such as 1 t construction quicklime.

6.4 Selection Criteria

The material (energy) data in this document should comply with the following selection criteria.

a) All energy inputs must be listed;

b) Both raw materials and auxiliary materials must be listed. If they meet the requirements of c) and d), they can be ignored.

c) Neglected individual material (energy) flows or unit processes contribute no more than 1% to the product's carbon footprint;

d) The total contribution of all neglected material (energy) flows and unit processes to the product's carbon footprint does not exceed 5%, and this contribution is not reflected in the product's carbon footprint report. This will be explained in the report;

e) Construction of infrastructure such as roads and factory buildings, manufacturing of equipment used in various processes, consumption and emissions of personnel and living facilities within the factory area. Both can be ignored.

7.1 Data Quality Requirements

7.1.1 The data and data quality shall meet the relevant requirements of 6.3.6, 6.3.7 and 6.3.8 in GB/T 24067-2024.

7.1.2 The activity data must meet the following requirements.

a) Completeness. The system should be checked for any missing unit processes or input/output substances in accordance with the data scavenging criteria (see 6.4).

Activity data should be collected from the company's production statistics for one calendar year or 12 consecutive months.

b) Accuracy. Energy and raw material consumption data in the activity data should be derived from the company's actual production statistics records. All activity data should be accurate.

It should be converted to be based on the declared unit, and relevant activity data, data sources, calculation processes, etc. should be recorded in detail.

7.1.3 The carbon footprint factor meets the following requirements.

a) Representativeness. Field data or emission factor data provided by suppliers should be used first; secondly, the latest data published by the state should be used.

And relevant database data that has been evaluated; finally, publicly published literature data and industry statistical recommendations are used.

b) Completeness. This should cover all unit processes defined at the system boundaries.

7.2 Data Collection and Verification

7.2.1 The following data should be collected during the raw material and auxiliary material production stage.

---The consumption of raw materials and auxiliary materials is uniformly converted into mass (t);

--- Carbon footprint factors of raw material and auxiliary material production processes.

Note: When limestone and dolomite in the raw materials are sourced from our own mines, the consumption of explosives, lubricating oil, diesel oil, etc., is collected and converted into mass (t).

7.2.2 The following data should be collected during the raw material transportation stage.

---The transport weight and consumption of raw materials and auxiliary materials are uniformly converted into mass (t);

---Transportation distance and mode of transport for raw materials and auxiliary materials. If there are multiple suppliers of raw materials and auxiliary materials, a weighted average transportation distance can be used.

The quality of transporting raw materials and auxiliary materials is of paramount importance;

---Carbon footprint factors for different modes of transportation.

7.2.3 The following data should be collected during the product manufacturing stage.

---For fuel transportation volume, distance, and mode of transport, if multiple suppliers exist, a weighted average transportation distance can be used, with the weight being the transportation distance. quality;

---Consumption of energy sources such as electricity, fuel, and heat;

---The lower heating value of the fuel;

---The carbon footprint of energy production, including electricity, fuel, and heat;

---Carbon footprint factor of fuel transportation;

---The carbon footprint factor of fuel combustion;

---Carbonate consumption;

---The calcium oxide content in carbonates;

---The magnesium oxide content in carbonates;

---Total lime production;

---Lime burning reduces volume.

7.2.4 The types of data collected at each stage of quicklime production shall be as per Appendix A.

7.3 Data Verification

During data collection, the accuracy of the data was confirmed through methods such as mass balance, energy balance, and comparison with historical data and data from similar processes.

Accuracy and reasonableness. For abnormal data, the cause should be analyzed and the data replaced. The replaced data should meet the data quality requirements (see 7.1).

7.4 Allocation

7.4.1 During system boundary settings or data collection, if it is found that at least one unit process's inputs and outputs contain multiple products, then... Distribute the allocation.

7.4.2 The allocation method is as follows.

a) Avoid data allocation by collecting data from detailed unit processes, such as using metering or statistical data by process or time period to replace data allocation across the entire plant. Annual statistics;

b) If data allocation cannot be avoided, prioritize allocation based on physical relationships, such as product quality;

c) If physical allocation is not feasible, the economic value of the product shall be used for allocation;

d) For symbiotic products that are used repeatedly in a closed loop, no allocation is required.

7.4.3 The allocation principles for waste-utilizing raw materials are as follows. the carbon footprint factor of the production process of waste-utilizing raw materials such as carbide slag, papermaking sludge, chalk, and seashells. It is 0.

8.1 General Rules

The GHG emissions should be multiplied by the mass of GHG emitted, based on the 100-year GWP given by the Intergovernmental Panel on Climate Change (IPCC) (see Appendix).

(Record B) to calculate the potential climate change impact of each GHG emission from the product, in kgCO2e/declared units. The product carbon footprint is for all The sum of potential climate change impacts of greenhouse gases. If the IPCC has revised the GWP, the latest figures should be used; otherwise, they should be included in the product carbon footprint report. The announcement explains this.

8.2 Calculation Method

8.2.1 Method for calculating the carbon footprint of quicklime products

After data collection and verification are completed, the activity data will be converted into a unified declaration unit and calculated according to formula (1).

8.2.2 Raw and auxiliary material production stage

Greenhouse gas emissions during the raw material production stage are calculated using formula (3), and the results are rounded to two decimal places.

8.2.4 Product Manufacturing Stage

Greenhouse gas emissions during the quicklime production process include the acquisition and transportation of energy consumed in production, the combustion of fossil fuels, and the calcination of carbonate raw materials.

The greenhouse gas emissions per unit of product produced during the decomposition process are calculated using formula (5), and the result is rounded to the nearest whole number. Two digits after the point.

8.3 Additional Environmental Information

In addition to the product carbon footprint quantification results described in section 8.2, other relevant important information should be described in the supplementary environmental information section, such as through... Non-fossil energy and green electricity consumption purchased and used through market-based transactions, etc.