Abstract: <SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: " mso-bidi-language: ZH-CN; mso-fareast-language: EN-US; mso-ansi-language: 1.0pt; mso-font-kerning: Roman?; New Times 宋体? mso-fareast-font-family: AR-SA; 12.0pt; mso-bidi-font-size:>There is a lot of by-product salt slag in hydrazine hydrate production.It can not be used in chlor-alkali industry as raw material directly because of the small amounts of harmful impurities,such as hydrazine hydrate and urea.Therefore,nitrogen must be removed from salt slag.A 15 t/a scale extension test of reutilization of by-product salt slag via high-temperature method and using self-developed patented equipment and technology was carried out.Results showed that when decomposition temperature was 450 </SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: " AR-SA? mso-bidi-language: ZH-CN; mso-fareast-language: EN-US; mso-ansi-language: 1.0pt; mso-font-kerning: Roman?; New ?Times mso-bidi-font-family: mso-hansi-font-family: Times>℃</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: " mso-bidi-language: ZH-CN; mso-fareast-language: EN-US; mso-ansi-language: 1.0pt; mso-font-kerning: Roman?; New Times 宋体? mso-fareast-font-family: AR-SA; 12.0pt; mso-bidi-font-size:>,feeding rate was 2.0 kg/h,and time dwell was 6 h,the total nitrogen mass fraction of salt slag after treatment was less than 2</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: " AR-SA? mso-bidi-language: ZH-CN; mso-fareast-language: EN-US; mso-ansi-language: 1.0pt; mso-font-kerning: Roman?; New ?Times mso-bidi-font-family: mso-hansi-font-family: Times>×</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: " mso-bidi-language: ZH-CN; mso-fareast-language: EN-US; mso-ansi-language: 1.0pt; mso-font-kerning: Roman?; New Times 宋体? mso-fareast-font-family: AR-SA; 12.0pt; mso-bidi-font-size:>10-5</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: " AR-SA? mso-bidi-language: ZH-CN; mso-fareast-language: EN-US; mso-ansi-language: 1.0pt; mso-font-kerning: Roman?; New ?Times mso-bidi-font-family: mso-hansi-font-family: Times>，</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: " mso-bidi-language: ZH-CN; mso-fareast-language: EN-US; mso-ansi-language: 1.0pt; mso-font-kerning: Roman?; New Times 宋体? mso-fareast-font-family: AR-SA; 12.0pt; mso-bidi-font-size:>and it can full meet the requirement of chlor-alkali industry.It opened up a viable technology route for the resource utilization of by-product of hydrazine hydrate production.</SPAN>