Reasons: 　　

 

1. There is too much slag or not cleaned in the molten iron , and the slag is not paid attention to when pouring; 　　

 

2. The slag is brought into the molten slag due to the cut-off during pouring; 　　

 

3. The pouring system does not block sand. 　

　

 

 

Treatment method: 　　

 

1. Increase the temperature of the molten iron appropriately, and add a small amount of dry sand to the molten iron ladle to facilitate slag accumulation; 　

 

2. Remove the residue in the molten iron ladle in advance; 　　

 

3. Pay attention to slag blocking when pouring There is a cut-off; 　　

 

4. Reasonably select the pouring system and strengthen the slag-retaining measures.

 

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