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METHOD FOR SELECTIVE RECOVERY OF THE SALT COMPONENTS FROM NITRITE-NITRATE-CONTAINING HARDENER SALTS
METHOD FOR SELECTIVE RECOVERY OF THE SALT COMPONENTS FROM NITRITE-NITRATE-CONTAINING HARDENER SALTS
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机译:含硝酸盐的哈丁盐中选择性回收盐组分的方法
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摘要
The salts component of nitrate/nitrite/hydroxide containing materials used in the tempering of steel is recovered by reducing the used salts to a grain size of 1 to 50 mm, dissolving the used salts in a solution of nitric acid containing H2O2 at 40 - 90 degrees C., filtering off the insoluble residue and precipitating KNO3 by cooling the concentrated neutralised salt solution to -10 to 20 degrees C. NaCl is crystallised out by further concentration of the solution at 60-120 degrees C. and NaNO3 is crystallised out from the remaining solution by the addition of concentrated HNO3.
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