Production process for preparing low-silicon ammonium bifluoride by taking fluosilicic acid as raw material

The invention discloses a production process for preparing low-silicon ammonium bifluoride by using fluosilicic acid as a raw material, which comprises the following steps: by using a fluosilicic acidsolution as a raw material, carrying out ammoniation desilicication and filtration to obtain an ammonium fluoride primary solution; and then adding a desilicication agent into the ammonium fluoride primary solution to carry out secondary desilicication, and then filtering, concentrating and crystallizing to obtain an ammonium hydrogen fluoride product. The content of fluosilicic acid radicals inthe ammonium bifluoride product is lower than 0.2%, and the application value of the byproduct fluosilicic acid is greatly improved. 本发明公开了一种以氟硅酸为原料制备低硅氟化氢铵的生产工艺，其是利用氟硅酸溶液为原料，通过氨化脱硅，过滤后得到氟化铵初级溶液；然后在氟化铵初级溶液中加入脱硅剂进行二次脱硅，然后过滤、浓缩、结晶，得到氟化氢铵产品。本发明的氟化氢铵产品中氟硅酸根含量低于0.2％，极大提高了副产氟硅酸的应用价值。