The Chinese Standard YB/T008-1997 on Slag The Chinese Standard YB/T008-1997 on Slag defines slag as a waste residue generated during the production or chemical processing of metal or metal-containing materials. This includes particulate, liquid or gaseous waste materials resulting from the melting and reduction of metal ores or other chemical treatment or extraction of metal or metal-containing materials, as well as waste materials which are generated in the process of making a range of metals and alloys. For example, slag may include materials resulting from the smelting of iron, steel, copper, magnesium, aluminum and other metals.
Slag is a by-product of various industrial processes and can contain a range of contaminants, including dirt, ash, dust, sulfur, sulfur dioxide, and other materials that can adversely affect the environment when released in the air or disposed of improperly. Some types of slag may also contain heavy metals, including lead and chromium. As such, it is important for industrial users and importers of slag to verify its composition and determine the potential for adverse environmental impacts.
The Chinese Standard YB/T008-1997 on Slag outlines the physical and chemical requirements of a range of slag types and provides acceptance criteria for each type. It divides slag into three main categories, including metal-containing slag, granulated slag and chopped slag. The acceptance criteria are based on the origin and chemical composition of the slag, with particular reference to the concentration of contaminants such as heavy metals, ash and dust. The standard also provides a testing method for the determination of the chemical composition of slag.
In addition to the requirements outlined in the Chinese Standard YB/T008-1997 on Slag, potential users and importers of slag should be aware of any other national, regional or local laws that may apply. For example, in some cases, slag may be subject to hazardous waste regulations. It is also important to take into account the potential for adverse environmental impacts that could arise from the improper disposal of slag and to conduct a risk assessment for all activities involving the handling, transport and disposal of slag.
