The product is a greyish crystalline paste, acidic, low toxicity, is a kind of double phosphonate amphoteric compounds, the effective content is up to 80%. There is good collecting and selectivity for tin oxide ore, tin sulfide ore. What happened is chemical adsorption between it and tin ore, the collector positioned on the surface of cassiterite, when use it with isooctyl alcohol together, the effect is better. Dosage in 150g~250g/ton, isooctyl alcohol in400g~500g/ton.