Abstract: Production process of high value-added potassium fluoborate by phosphate fertilizer by-products fluosilicic acid and boric acid was introduced in detail.Reaction principle of the process,process flow,process control,main equipment,and the advantages of equipment were described.Experiment showed the method that uses the fluorine in fluosilicic acid to react with boric acid to produce fluoboric acid and silica and fluoboric acid react with potassium chloride to produce potassium fluoborate is feasible.When the reaction temperature of F and B was at 75~85 ℃ and time was at 2.5~3 h,the conversion rate was high;and when the potassium chloride was added according to the theoretical value,the product quality was stable.Process using fluosilicic acid，a by-product from phosphate fertilizer industry to produce potassium fluoborate,making silicon convert into silica,not only realized comprehensive utilization of resources,but also create a new profit growth point as utilizing the waste to produce new product and saved the fossil resources of fluorite.Meanwhile,it had a significant decline in the cost comparing with hydrofluoric acid method.Therefore,it will be a future trend of potassium fluoroborate production. 

Key words: fluosilicic acid, boric acid, potassium fluoborate, silica