【正文】 ...............1 前言 .......................................................................................................................................................1 本課題研究的目的和意義 ...................................................................................................................1 目的 ................................................................................................................................................1 意義 ................................................................................................................................................1 純堿副產(chǎn)物氯化鈉提純研究現(xiàn)狀 .......................................................................................................1 氯化鈉提純的方法 ........................................................................................................................1 氯化鈉的生產(chǎn)現(xiàn)狀 ........................................................................................................................4 ...................................................................................................................................................1 實驗材料 ...............................................................................................................................................1 實驗試劑及儀器 ...................................................................................................................................1 實驗試劑 ........................................................................................................................................1 實驗儀器 .........................................................................................................................................1 實驗所需溶液、試 劑的配制 ...............................................................................................................1 PH=10 的 NH3—NH4Cl 緩沖溶液 ...............................................................................................1 1+n HCl ...........................................................................................................................................1 2mol/L NaOH 溶液 .........................................................................................................................1 (Mg— EDTA)溶液 ................................................................1 5%鉻酸鉀溶液 ................................................................................................................................1 碳酸鈉溶液 ....................................................................................................................................1 氫氧化鈣溶液 ................................................................................................................................1 氧化鋅標準溶液 ............................................................................................................................2 （EDTA）標準溶液 ...............................................................2 樣品溶液 .......................................................................................................................................2 純堿副產(chǎn)物氯化鈉中各種組分含量的測定方法 ................................................................................2 水分含量的測定方法 .....................................................................................................................2 水不溶物含量的測定方法 ............................................................................................................3 鈣和鎂離子含量的測定方法 .........................................................................................................3 硫酸根離子含量的測定方法(EDTA 絡合滴定法) .......................................................................4 氯離子含量的測定方法 .................................................................................................................5 碳酸根離子的檢測方法 .................................................................................................................6 鈉離子含量的測定方法 .................................................................................................................6 化學沉淀法提純純堿副產(chǎn)物氯化鈉的研究 ........................................................................................6 化學沉淀法的實驗原理 .................................................................................................................6 化學沉淀法的試驗方案 .................................................................................................................7 化學沉淀法的實驗步驟 .................................................................................................................7 重結(jié)晶法提純純堿副產(chǎn)物氯化鈉的研究 ............................................................................................9 重結(jié)晶法的實驗原理 .....................................................................................................................9 重結(jié)晶法的試驗方案 ...................................................................................................................10 重結(jié)晶法的實驗步驟 ...................................................................................................................103．結(jié)果與討論 ................................................................................................................................................1 原樣品中各組分測定結(jié)果與討論 ........................................................................................................1 化學沉淀法的實驗結(jié)果與討論 ............................................................................................................1 化學沉淀法單因素實驗結(jié)果與討論 .............................................................................................1 化學沉淀法正交實驗結(jié)果與討論 .................................................................................................5 化學沉淀法產(chǎn)品中各組分含量測定的結(jié)果與討論 ...................................................................10 重