"XR Xinrong Brand" PB-88 electric furnace gunning mix is one of the monolithic refractories our company produces. It is specially made for the half-dry method fettling go the easy damaging positions like furnace wall, slag line etc. in the arc furnaces to prolong the service life of the monolithic furnace body, to reach the target of reducing cost & increasing economic benefit.

1. Main physical specification

2. Binder

The binder or this product is made according to world advanced batch design. Take into consideration that electric furnace steel making is mainly to produce special steels & the process is relatively sensitive to phosphorus content, to raise up the product's generality, we use sodium silicate as the principal part of binder to guarantee the quality of the steel. To raise up adhesion rate and to guarantee the gunning mix be well sintered, additives like spinel, bentonite, refractory clay etc. are added to the product.

3. Raw Material:

The product takes dead burned magnesite as its main raw material. It is MgO over 91% dead burned magnesite that be crushed & screened into all sizes of aggregate, while fused magnesite be as the high matrix materials. Refractoriness & erosion resistance of the gunning mix is there-of guaranteed.

Main Chemical Specification

To be a good gunning mix, not only the aggregate shall be selected well, but also the high matrix powder plays a very important role. Without the high matrix powder being as a backing, the adhesive proportion & the erosion resistance of the gunning mix shall be reduced greatly. Therefor, this product has very strict control on the powder on mesh size, quantity & MgO content. The basic part of the powder feed is super quality fused magnesite to guarantee the quality of the gunning mix.

4. Construction Requirement

Beside of the quality of the gunning mix itself, during gunning process, the amount of gunning, the pressure of the compressed air & the proportion of water added, they all play each a role of utmost importance to perform a good product property. Gunning has to follow the principles of uniformity, rapidity & shallowity. Non-uniform gunning or too thick gunning may cause dropping off & per unit steel consumption is then increased. Benefit shall be influenced. Normally per ton steel consumption is around 5kg.

The product uses 4mm maximum critical size plus 5 grades of size composition therefor the rolling characteristics are fine. The gunning machine's working compressed air pressure is best to be 0.3MPa. A low pressure may cause the gun blocked up or a low adhesive proportion, while a high pressure may cause the material be reflected & gunning effect is there-of influenced.

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