精制工(gong)業(ye)鹽(yan)不同于海(hai)鹽(yan)。它顆粒小，比表面積(ji)大，溶(rong)解速度快。然而，由于顆粒太細，工(gong)業(ye)鹽(yan)很容易(yi)夾帶形成(cheng)浮鹽(yan)。在鹽(yan)的融化(hua)過程(cheng)中，它表現出與(yu)海(hai)鹽(yan)完全不同的特性。精制工(gong)業(ye)鹽(yan)的主要成(cheng)分是什么

精制(zhi)工(gong)業鹽(yan)(yan)(yan)的(de)(de)主要成分是(shi)(shi)氯化鈉，其中(zhong)(zhong)(zhong)還含有少量(liang)(liang)鈣(gai)和(he)鎂離子、硫酸鹽(yan)(yan)(yan)離子和(he)一(yi)些固(gu)體(ti)不溶性物質。亞(ya)硝(xiao)(xiao)酸鈉一(yi)點也不重(zhong)要。沒有關(guan)于(yu)工(gong)業鹽(yan)(yan)(yan)中(zhong)(zhong)(zhong)重(zhong)金屬(shu)含量(liang)(liang)的(de)(de)數(shu)據(ju)。然(ran)而(er)(er)，從常(chang)用的(de)(de)角度來看，工(gong)業鹽(yan)(yan)(yan)中(zhong)(zhong)(zhong)的(de)(de)重(zhong)金屬(shu)含量(liang)(liang)應該非常(chang)低(di)。精制(zhi)鹽(yan)(yan)(yan)、優質精制(zhi)鹽(yan)(yan)(yan)和(he)各種營養鹽(yan)(yan)(yan)對缺鐵、鋅、鈣(gai)等(deng)元素引起的(de)(de)各種疾病有良(liang)好的(de)(de)保健作用，應大力提倡。至于(yu)為(wei)什么到處(chu)都(dou)(dou)說(shuo)工(gong)業鹽(yan)(yan)(yan)是(shi)(shi)亞(ya)硝(xiao)(xiao)酸鈉，是(shi)(shi)因(yin)為(wei)初中(zhong)(zhong)(zhong)和(he)高中(zhong)(zhong)(zhong)的(de)(de)很多(duo)化學(xue)老師都(dou)(dou)會這樣(yang)教，媒體(ti)也會這么說(shuo)，但(dan)為(wei)什么呢？因(yin)為(wei)亞(ya)硝(xiao)(xiao)酸鈉是(shi)(shi)鹽(yan)(yan)(yan)，所以在工(gong)業中(zhong)(zhong)(zhong)經常(chang)使用，所以通常(chang)被稱為(wei)亞(ya)硝(xiao)(xiao)酸鈉。然(ran)而(er)(er)，亞(ya)硝(xiao)(xiao)酸鈉等(deng)雜質的(de)(de)含量(liang)(liang)低(di)于(yu)1%

工業鹽(yan)(yan)(yan)(yan)(yan)在工業中(zhong)被(bei)廣(guang)泛使(shi)用(yong)(yong)(yong)。它(ta)是(shi)化學工業的(de)(de)(de)(de)基本原料之(zhi)一，被(bei)稱為(wei)(wei)；化學工業之(zhi)母；。工業鹽(yan)(yan)(yan)(yan)(yan)指原鹽(yan)(yan)(yan)(yan)(yan)，可分(fen)為(wei)(wei)湖鹽(yan)(yan)(yan)(yan)(yan)、井(jing)鹽(yan)(yan)(yan)(yan)(yan)和(he)海(hai)鹽(yan)(yan)(yan)(yan)(yan)。由于(yu)海(hai)鹽(yan)(yan)(yan)(yan)(yan)中(zhong)的(de)(de)(de)(de)海(hai)水被(bei)多(duo)種元素(su)溶解，海(hai)鹽(yan)(yan)(yan)(yan)(yan)的(de)(de)(de)(de)工業價(jia)值相(xiang)對較高，食用(yong)(yong)(yong)價(jia)值較低。工業鹽(yan)(yan)(yan)(yan)(yan)的(de)(de)(de)(de)范圍很(hen)(hen)廣(guang)，是(shi)一個通用(yong)(yong)(yong)術語(yu)。原鹽(yan)(yan)(yan)(yan)(yan)和(he)水洗(xi)鹽(yan)(yan)(yan)(yan)(yan)可以(yi)(yi)(yi)成為(wei)(wei)工業鹽(yan)(yan)(yan)(yan)(yan)。這里簡單介紹(shao)一下粗(cu)鹽(yan)(yan)(yan)(yan)(yan)是(shi)如何用(yong)(yong)(yong)作(zuo)(zuo)輔助(zhu)肥(fei)料的(de)(de)(de)(de)。除氯化鈉外，粗(cu)鹽(yan)(yan)(yan)(yan)(yan)的(de)(de)(de)(de)主要成分(fen)還含有(you)(you)鎂(mei)、鉀、硫(liu)以(yi)(yi)(yi)及作(zuo)(zuo)物(wu)所需(xu)的(de)(de)(de)(de)少量(liang)硼、碘等營養元素(su)。雖然(ran)它(ta)不(bu)是(shi)作(zuo)(zuo)物(wu)的(de)(de)(de)(de)直(zhi)接(jie)肥(fei)料，但(dan)只需(xu)合理施(shi)(shi)(shi)(shi)用(yong)(yong)(yong)，對一些(xie)喜鈉作(zuo)(zuo)物(wu)有(you)(you)很(hen)(hen)好的(de)(de)(de)(de)效果(guo)。例如，在甜菜和(he)芹(qin)菜等作(zuo)(zuo)物(wu)上施(shi)(shi)(shi)(shi)用(yong)(yong)(yong)農用(yong)(yong)(yong)鹽(yan)(yan)(yan)(yan)(yan)，不(bu)僅可以(yi)(yi)(yi)提高產量(liang)，還可以(yi)(yi)(yi)提高和(he)改善甜菜和(he)芹(qin)菜等喜鈉作(zuo)(zuo)物(wu)的(de)(de)(de)(de)質量(liang)。但(dan)是(shi)，稻田不(bu)應長期(qi)單獨(du)施(shi)(shi)(shi)(shi)用(yong)(yong)(yong)過(guo)(guo)量(liang)的(de)(de)(de)(de)農用(yong)(yong)(yong)鹽(yan)(yan)(yan)(yan)(yan)。否則，鈉離子(zi)會(hui)破壞土壤的(de)(de)(de)(de)優良結構，導(dao)致干燥(zao)時硬化和(he)開裂(lie)，潮濕時腐(fu)爛和(he)粘稠(chou)，滲(shen)透性(xing)差(cha)，耕作(zuo)(zuo)不(bu)當。因(yin)此(ci)，粗(cu)鹽(yan)(yan)(yan)(yan)(yan)可以(yi)(yi)(yi)作(zuo)(zuo)為(wei)(wei)補(bu)充肥(fei)料，在增加(jia)有(you)(you)機肥(fei)施(shi)(shi)(shi)(shi)用(yong)(yong)(yong)量(liang)的(de)(de)(de)(de)基礎上合理施(shi)(shi)(shi)(shi)用(yong)(yong)(yong)，不(bu)能多(duo)施(shi)(shi)(shi)(shi)或逐年施(shi)(shi)(shi)(shi)用(yong)(yong)(yong)。施(shi)(shi)(shi)(shi)用(yong)(yong)(yong)粗(cu)鹽(yan)(yan)(yan)(yan)(yan)的(de)(de)(de)(de)方(fang)法：通常，粗(cu)鹽(yan)(yan)(yan)(yan)(yan)與(yu)人畜(chu)糞便(bian)等有(you)(you)機肥(fei)料混合，并作(zuo)(zuo)為(wei)(wei)基肥(fei)堆(dui)肥(fei)。在苗木(mu)移(yi)栽過(guo)(guo)程中(zhong)，它(ta)也可以(yi)(yi)(yi)被(bei)幼苗根部染色，也可以(yi)(yi)(yi)直(zhi)接(jie)用(yong)(yong)(yong)作(zuo)(zuo)追肥(fei)。每畝用(yong)(yong)(yong)量(liang)以(yi)(yi)(yi)5～8kg為(wei)(wei)宜。