精(jing)制(zhi)工業(ye)鹽(yan)不(bu)同于海鹽(yan)。它顆粒小(xiao)，比表面積大，溶解速度快。然而，由于顆粒太細，工業(ye)鹽(yan)很容易(yi)夾帶形成浮鹽(yan)。在鹽(yan)的融化過程中，它表現出與海鹽(yan)完全(quan)不(bu)同的特性。精(jing)制(zhi)工業(ye)鹽(yan)的主(zhu)要成分(fen)是什么(me)

精(jing)(jing)制(zhi)工業(ye)鹽(yan)的(de)主要成分是(shi)氯(lv)化鈉，其中還含(han)有(you)少量鈣(gai)和(he)鎂離子、硫酸鹽(yan)離子和(he)一些固體(ti)不溶性物質(zhi)。亞(ya)硝(xiao)(xiao)酸鈉一點(dian)也不重要。沒(mei)有(you)關于(yu)工業(ye)鹽(yan)中重金屬(shu)含(han)量的(de)數據(ju)。然而(er)，從常(chang)用的(de)角度來看，工業(ye)鹽(yan)中的(de)重金屬(shu)含(han)量應(ying)該非(fei)常(chang)低。精(jing)(jing)制(zhi)鹽(yan)、優質(zhi)精(jing)(jing)制(zhi)鹽(yan)和(he)各(ge)種(zhong)營養鹽(yan)對缺鐵(tie)、鋅(xin)、鈣(gai)等元素引起(qi)的(de)各(ge)種(zhong)疾病有(you)良好的(de)保健作用，應(ying)大(da)力提倡。至于(yu)為(wei)(wei)(wei)什(shen)么(me)到(dao)處都說(shuo)工業(ye)鹽(yan)是(shi)亞(ya)硝(xiao)(xiao)酸鈉，是(shi)因(yin)為(wei)(wei)(wei)初中和(he)高中的(de)很(hen)多化學老師都會這(zhe)樣(yang)教，媒體(ti)也會這(zhe)么(me)說(shuo)，但為(wei)(wei)(wei)什(shen)么(me)呢？因(yin)為(wei)(wei)(wei)亞(ya)硝(xiao)(xiao)酸鈉是(shi)鹽(yan)，所(suo)以(yi)在(zai)工業(ye)中經常(chang)使(shi)用，所(suo)以(yi)通常(chang)被稱為(wei)(wei)(wei)亞(ya)硝(xiao)(xiao)酸鈉。然而(er)，亞(ya)硝(xiao)(xiao)酸鈉等雜質(zhi)的(de)含(han)量低于(yu)1%

工(gong)(gong)業(ye)(ye)(ye)鹽(yan)(yan)在(zai)(zai)工(gong)(gong)業(ye)(ye)(ye)中被(bei)廣泛使(shi)用(yong)(yong)(yong)(yong)(yong)。它是化(hua)學工(gong)(gong)業(ye)(ye)(ye)的基(ji)(ji)本原(yuan)料之(zhi)一(yi)，被(bei)稱為；化(hua)學工(gong)(gong)業(ye)(ye)(ye)之(zhi)母；。工(gong)(gong)業(ye)(ye)(ye)鹽(yan)(yan)指原(yuan)鹽(yan)(yan)，可(ke)分(fen)為湖鹽(yan)(yan)、井鹽(yan)(yan)和(he)(he)海鹽(yan)(yan)。由(you)于海鹽(yan)(yan)中的海水被(bei)多種元(yuan)素溶解，海鹽(yan)(yan)的工(gong)(gong)業(ye)(ye)(ye)價(jia)值相對較(jiao)高，食用(yong)(yong)(yong)(yong)(yong)價(jia)值較(jiao)低。工(gong)(gong)業(ye)(ye)(ye)鹽(yan)(yan)的范(fan)圍很廣，是一(yi)個通用(yong)(yong)(yong)(yong)(yong)術語。原(yuan)鹽(yan)(yan)和(he)(he)水洗鹽(yan)(yan)可(ke)以成為工(gong)(gong)業(ye)(ye)(ye)鹽(yan)(yan)。這里簡(jian)單(dan)介紹一(yi)下(xia)粗(cu)鹽(yan)(yan)是如何用(yong)(yong)(yong)(yong)(yong)作(zuo)(zuo)(zuo)輔助肥(fei)(fei)(fei)料的。除氯化(hua)鈉(na)外(wai)，粗(cu)鹽(yan)(yan)的主(zhu)要成分(fen)還含有鎂(mei)、鉀、硫以及作(zuo)(zuo)(zuo)物(wu)(wu)所需的少量(liang)(liang)硼、碘等(deng)營養元(yuan)素。雖然它不是作(zuo)(zuo)(zuo)物(wu)(wu)的直(zhi)接肥(fei)(fei)(fei)料，但(dan)只(zhi)需合(he)理施(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)，對一(yi)些喜(xi)(xi)鈉(na)作(zuo)(zuo)(zuo)物(wu)(wu)有很好的效(xiao)果。例如，在(zai)(zai)甜菜和(he)(he)芹(qin)(qin)菜等(deng)作(zuo)(zuo)(zuo)物(wu)(wu)上施(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)農(nong)用(yong)(yong)(yong)(yong)(yong)鹽(yan)(yan)，不僅可(ke)以提高產量(liang)(liang)，還可(ke)以提高和(he)(he)改善(shan)甜菜和(he)(he)芹(qin)(qin)菜等(deng)喜(xi)(xi)鈉(na)作(zuo)(zuo)(zuo)物(wu)(wu)的質量(liang)(liang)。但(dan)是，稻田不應長期單(dan)獨施(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)過量(liang)(liang)的農(nong)用(yong)(yong)(yong)(yong)(yong)鹽(yan)(yan)。否則，鈉(na)離子會破壞土壤的優(you)良結構(gou)，導致干燥時硬化(hua)和(he)(he)開裂，潮濕時腐爛和(he)(he)粘稠，滲透性差，耕(geng)作(zuo)(zuo)(zuo)不當(dang)。因此，粗(cu)鹽(yan)(yan)可(ke)以作(zuo)(zuo)(zuo)為補(bu)充肥(fei)(fei)(fei)料，在(zai)(zai)增加(jia)有機肥(fei)(fei)(fei)施(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)量(liang)(liang)的基(ji)(ji)礎上合(he)理施(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)，不能多施(shi)(shi)(shi)或逐年(nian)施(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)。施(shi)(shi)(shi)用(yong)(yong)(yong)(yong)(yong)粗(cu)鹽(yan)(yan)的方法：通常，粗(cu)鹽(yan)(yan)與(yu)人畜糞(fen)便等(deng)有機肥(fei)(fei)(fei)料混(hun)合(he)，并作(zuo)(zuo)(zuo)為基(ji)(ji)肥(fei)(fei)(fei)堆肥(fei)(fei)(fei)。在(zai)(zai)苗木移栽過程中，它也可(ke)以被(bei)幼苗根(gen)部(bu)染色，也可(ke)以直(zhi)接用(yong)(yong)(yong)(yong)(yong)作(zuo)(zuo)(zuo)追(zhui)肥(fei)(fei)(fei)。每畝(mu)用(yong)(yong)(yong)(yong)(yong)量(liang)(liang)以5～8kg為宜。