A dry mix refractory guncrete machine is a device specifically designed for refractory material spraying. It uses compressed air to propel dry powdered refractory materials (such as refractory aggregates and binders) at high speed onto the work surface, forming a uniform refractory layer. Its core principle is based on rotor-type spraying technology. The material is mixed with compressed air within the rotor chamber, then conveyed through a delivery pipe to the nozzle, where it is mixed with high-pressure water to achieve wet spraying, ensuring thorough hydration of the material and reducing rebound rate.
 
Dry mix refractory guncrete machine working principle:
Dry refractory mix is ​​loaded into the machine's hopper.
The electric motor drives the rotor to feed the dry mix into the air stream.
Compressed air transports the dry mix through the delivery hose to the nozzle.
At the nozzle, water is injected to moisten the refractory material.
The wet mixture is sprayed onto the target surface at high velocity, forming a dense, adherent refractory layer.
 
Advantages of the dry mix refractory guncrete machine:
1. High-Efficiency Construction: 
Spraying speed can reach 1-3 m³/h, far exceeding traditional wet spraying processes, significantly shortening the construction period.
Suitable for large-area refractory layer construction (such as industrial furnace linings, steel ladle inner walls, etc.), with a daily construction area of ​​hundreds of square meters.
2. Low Rebound Rate: 
Equipped with a pre-wetted nozzle system, water and dry powder are evenly mixed through a high-pressure water ring, controlling the rebound rate to 10%-15% (compared to 20%-30% for traditional equipment), reducing material waste.
3. Precise Control
Equipped with an ABB frequency converter, the output power can be adjusted in real time (1-3 m³/h) to adapt to different construction needs.
The nozzle is equipped with a dual-needle valve adjustment system to precisely control the water-cement ratio, ensuring the strength and density of the refractory layer.
4. Environmental Performance
The closed conveying system reduces dust leakage, and with the dust removal device, the dust concentration in the work area is below 8 mg/m³ (national standard ≤10 mg/m³).
Low noise design (≤85dB) meets industrial environmental protection requirements.
 
Dry mix refractory gunite machine application scenarios:
1. Steel Industry
Blast furnace, converter, and electric furnace lining repair; permanent layer spraying for steel ladles.
Case Study: During a major overhaul of a steel plant's blast furnace, the use of this equipment to spray aluminosilicate refractory materials extended the service life to 5 years (compared to 3 years with traditional methods).
2. Cement Industry: Spraying the linings of rotary kilns and preheater to resist high temperatures and chemical corrosion.
Data: After spraying, the uniformity of the refractory layer thickness in a cement plant's rotary kiln improved by 20%, and thermal efficiency increased by 5%.
3. Glass Industry: Spraying the walls of melting furnaces and breast walls to prevent molten glass corrosion.
Results: After spraying, the lifespan of the furnace walls increased from 18 months to 30 months, reducing the frequency of furnace shutdowns for maintenance.
4. Petrochemical Industry: Spraying the linings of reactors and cracking furnaces to resist high temperatures and corrosive media.
Case Study: After spraying, the thermal shock resistance of the refractory layer in a refinery's catalytic cracking unit improved by 30%.