Waste produced by shot blasting machines mainly consists of dust and residual abrasives, which can be processed as described below:
Dust Treatment
Dust generated during the operation of the shot blasting machine is handled by the dust removal system. Dust-laden air flows through connected pipelines into the baghouse dust collector. Coarse dust particles settle in the ash hopper. Fine dust particles are intercepted and filtered by filter bags, then drawn by a high-pressure centrifugal fan and discharged through the exhaust stack into the atmosphere. The dust emission concentration fully complies with the emission limits specified in national environmental protection regulations.
Residual Abrasive Treatment
Spent residual abrasives can be recycled and reused. For instance, waste stainless steel shot can be sold to processing manufacturers. After screening and crushing, fine granular abrasives are obtained, which can be supplied to machinery counterweight manufacturers as counterweight raw materials. Mixtures containing oxide slag can be sold to chemical enterprises for secondary utilization.
Safety Precautions
Iron oxide dust stripped from cast workpieces during shot blasting is highly flammable and poses major safety hazards. To prevent fire risks, the internal temperature of the shot blasting equipment must be kept below 80°C; metal oxides and oxide dust deposits shall be cleaned regularly. Furthermore, static electricity accumulation may trigger fires, so anti-static measures must be implemented.
