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Slurry circulating pump of steel plant sintering desulfurization system is in the process of running for a long time,impeller surface suffers the damage
of abrasion,corrosion and cavitation etc.The blade will be wear thin gradual,and appear the concave pit(corrosion),even appear the gap,these concave
pit and gap will enlarge slowly and cause the structural damage,finally lead to the impeller scrap,at the same time,it will reduce the efficiency of pumps
seriously,the working conditions of slurry pump is very abominable,generally running for about 3 months,it needs to change or repair the impeller,the
material of impeller is special,the cost is very expensive,so it can save a lot of money to do the repairing and preventing in time.
Under the condition of serious abrasion and corrosion of the slurry recycle pump from Tianjin Rongcheng steel sintering desulfuration,they choose the
BD772 slurry circulating pump wear resistant repair silicon carbide coating of Xiangyang City Hundred Shield Coating Material Co.,Ltd to do the repairing,
the service life of slurry recycle pump after repairing increases too much.
Based on the working environment of slurry circulating pump,using the brushable anti wear abrasion corrosion resistant coating can very effectively
solve the problems of mechanical wear abrasion,chemical corrosion and cavitation,recover the quality of impeller surface,prolong the service life,
improve the running status of pumps,improve the efficiency.
1.Surface treatment: Do coarsening treatment on the pending-repair area,grinding with angle grinder or sand blasting etc,the surface after coarsening
treatment should be cleaned,the surface after this treatment should be the one coarsening,dry and fresh substrates,should be no greasy dirt and dust.
2.The preparation of prime coat BD426 and make it be coating on the surface of pending-repair part.
3.Preparation:Make the A and B two components of BD772 slurry recycle pump wear repair silicon carbide coating mix uniformly according to
the weight ratio A:B=5:1,and use it up within 30 min,Generally it’s while construction and configuration.Every time the most configuration quantity
is not more than 2Kg,too much adhesive is solidified too fast,hasn’t been used up until partial adhesive has solidified and can’t be used. According to
the actual temperature,configuration can be appropriately a little more in winter,proper less in summer.If the temperature is too low,you can properly
heat up the A component to reduce viscosity for easy to configure.
4.Coating: the suitable coating thickness of BD772 silicon carbide coatings is 2-15mm,the most thickness can be 30mm..Make the well mixed
material be coating on the pending-repair area layer by layer, the first layer should be compacted, make it infiltrate fully with the substrates.
Repair the surface to be smooth after the coating is coated in the suitable size,or use the low viscosity abrasion resistant adhesives to smear
the surface of the coatings.This material can do machining,if there is out of tolerance,you can do milling and grinding process.
5.Curing: It can be put into using after curing for 24 hours at the temperature of 25 degree.When the temperature is below 15 degree,
the coatings can’t be cured completely,should heat it up to the temperature of 80 degree and keep this temperature for 2 hours to promote
the coatings fully curing after the coating initial curing (can use the iodine tungsten lamp to do irradiation heating with 40cm distance from the coating).
The slurry circulating pump impeller effect picture after repairing: