Sand waste processing; treatment of materials in the nature of foundry sand; aggregate waste processing; heat treatment of foundry sand; heat treatment of molding sand; heat treatment of waste sand; waste sand recycling; air purification and water treatment; rental of machinery and equipment for the chemical and mechanical processing of foundry sand, mold sand and ceramic sand; rental of machines and equipment for heat treatment of foundry sand, mold sand and ceramic sand; sand recycling; pro...