Turning Industrial Waste into Mineral Wool
Blast furnace slag, nickel slag, fly ash and other industrial residues used to be landfill material. Shaanxi Chengda Industrial Furnace Manufacturing Co., Ltd. designs electric melting furnaces that convert these wastes into mineral wool and rock wool - high-value insulation products for construction and industrial use. The company now operates one of the widest installed bases of waste-to-wool electric furnaces in China.
Representative Projects
| Project | Capacity | Feed Material |
|---|---|---|
| Zhejiang Zhuji power plant cold slag rock wool line | 7500kVA | Fly ash, basalt, slag |
| Gansu Baiyin cold slag furnace | 7000kVA | Industrial cold slag |
| Inner Mongolia Puyuan mineral wool furnace | 3200kVA | Blast furnace slag |
| Hebei Handan blast furnace slag heating furnace | 4000kVA | Hot blast furnace slag |
| Jiangsu Delong nickel slag heating furnace | 4000kVA class | Nickel slag |
| Shanxi Lanxian solid waste processing furnace | 3200kVA | Solid waste |
Equipment Features
- Electric heating instead of coke cupola - comprehensive energy consumption per tonne of product is reduced by more than 40%, and melting efficiency is roughly double that of a traditional cupola.
- Precise melt temperature and flow control - the furnace delivers a stable melt temperature and slag flow to the centrifuge, which directly improves fibre forming rate and product consistency.
- Wide raw material flexibility - the same furnace line can run high-acidity-coefficient and high-temperature-resistant wool grades by adjusting burden composition.
- Clean and low carbon - flue gas volume is sharply reduced compared with coke firing, cutting dust and pollutant emissions.
Commissioning Record
On the Zhuji project, Chengda completed installation and cold commissioning of the 7500kVA cold slag rock wool electric furnace within two months, with the customer's project team confirming mechanical completion ahead of schedule. The line entered hot production after the Chinese New Year holiday and has since run continuously. On the Handan project, the 4000kVA blast furnace slag heating furnace was ignited successfully on first attempt, and on the Jiangsu Delong project the nickel slag heating furnace achieved smooth slag tapping shortly after start-up.
Value for Customers
For steel mills and waste incineration plants, the furnace converts a disposal cost into a product revenue stream. For mineral wool producers, it offers a stable, controllable melting source that is not exposed to coke price volatility. Chengda supports each project from burden test and furnace sizing through installation, operator training and spare parts.
Project Delivery Model
Chengda handles burden testing, furnace sizing, thermal calculation, shell and cooling design, fabrication, installation supervision, operator training and spare parts supply in a single contract. Customers receive general arrangement drawings, water pressure test records and a commissioning report for each furnace line.