Abstract: From the perspective of recycling economy,taking the industrial phosphoric acid as a target product,starting from the production of yellow phosphorus and phosphoric acid by wet process,based on the existing production techniques in the upstream and downstream of yellow phosphorus industry and the production of phosphoric acid by wet process,a systematic techno economic analysis on the two different processing routes (furnace process and wet process) was made.Prices of raw materials and products were introduced and the wet and furnace processes were treated as a system separately in the analysis and research.In order to discuss and compare their competitiveness,the profit made by all the products of each system was used to offset the cost of industrial phosphoric acid.Especially,the influence of power expense and sulfur price on the costs of the two processing routes was discussed.In addition,the suggestions about the development of recycling economy were put forward.At last,it was pointed that the cost of the production process of industrial phosphoric acid from the purification of phosphoric acid by wet process was higher than that of phosphoric acid by furnace process after the implementation of a series of measures,such as using tail gas in the yellow phosphorus production to make C1 chemical products and comprehensive utilization of waste residue and heat.

Key words: font-family: "Times New Roman", mso-bidi-font-size: 12.0pt, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, phosphoric acid by furnace process;phosphoric acid by wet process;purification')">mso-fareast-font-family: 宋体">phosphoric acid by furnace process;phosphoric acid by wet process;purification