dust and sludge的用法和样例：
- Research on the foaming process of smelting reduction of blast furnace dust and sludge in iron bath.
- In this paper,a review has been presented focusing on the development of recycling dust and sludge formed in ironmaking and steelmaking processes with injecting method in recent years.
- Recycling process of Zinc-borne dust and sludge at Baosteel
- Dust and dirt soon accumulate if a house is not clean regularly.
- Dust and dirt soon accumulate if a house is not cleaned regularly.
- INTRODUCTION OF RECYCLING PROCESS OF ZINC-BORNE DUST AND SLUDGE AT BAOSTEEL