精制(zhi)(zhi)工(gong)業(ye)鹽不(bu)同(tong)(tong)于海鹽。它顆粒(li)小，比表面(mian)積大，溶解速(su)度快。然而(er)，由于顆粒(li)太細(xi)，工(gong)業(ye)鹽很容易(yi)夾帶形成浮鹽。在鹽的(de)融(rong)化過程(cheng)中，它表現出與海鹽完全不(bu)同(tong)(tong)的(de)特(te)性(xing)。精制(zhi)(zhi)工(gong)業(ye)鹽的(de)主(zhu)要成分是什么(me)

精(jing)制(zhi)(zhi)工業鹽(yan)(yan)(yan)(yan)的主要成分是氯(lv)化鈉，其中(zhong)還含(han)有少量(liang)(liang)(liang)鈣和鎂離子(zi)(zi)、硫(liu)酸(suan)(suan)鹽(yan)(yan)(yan)(yan)離子(zi)(zi)和一(yi)些固體不溶(rong)性物質(zhi)。亞(ya)(ya)硝(xiao)(xiao)酸(suan)(suan)鈉一(yi)點也不重(zhong)要。沒有關(guan)于(yu)(yu)工業鹽(yan)(yan)(yan)(yan)中(zhong)重(zhong)金(jin)屬含(han)量(liang)(liang)(liang)的數(shu)據。然而(er)，從(cong)常(chang)用的角度來看，工業鹽(yan)(yan)(yan)(yan)中(zhong)的重(zhong)金(jin)屬含(han)量(liang)(liang)(liang)應該非常(chang)低。精(jing)制(zhi)(zhi)鹽(yan)(yan)(yan)(yan)、優(you)質(zhi)精(jing)制(zhi)(zhi)鹽(yan)(yan)(yan)(yan)和各種(zhong)營養鹽(yan)(yan)(yan)(yan)對缺鐵(tie)、鋅、鈣等(deng)元(yuan)素引起的各種(zhong)疾病有良(liang)好(hao)的保健作用，應大力提倡。至于(yu)(yu)為(wei)什么到處都說工業鹽(yan)(yan)(yan)(yan)是亞(ya)(ya)硝(xiao)(xiao)酸(suan)(suan)鈉，是因為(wei)初中(zhong)和高中(zhong)的很多化學老師都會這樣教，媒(mei)體也會這么說，但(dan)為(wei)什么呢(ni)？因為(wei)亞(ya)(ya)硝(xiao)(xiao)酸(suan)(suan)鈉是鹽(yan)(yan)(yan)(yan)，所(suo)以(yi)在工業中(zhong)經(jing)常(chang)使用，所(suo)以(yi)通(tong)常(chang)被稱(cheng)為(wei)亞(ya)(ya)硝(xiao)(xiao)酸(suan)(suan)鈉。然而(er)，亞(ya)(ya)硝(xiao)(xiao)酸(suan)(suan)鈉等(deng)雜質(zhi)的含(han)量(liang)(liang)(liang)低于(yu)(yu)1%

工(gong)(gong)(gong)業鹽(yan)(yan)(yan)(yan)在(zai)工(gong)(gong)(gong)業中(zhong)被廣(guang)泛使(shi)用(yong)(yong)。它(ta)是(shi)(shi)化(hua)(hua)學(xue)工(gong)(gong)(gong)業的(de)(de)基本原料(liao)(liao)之一，被稱(cheng)為(wei)(wei)；化(hua)(hua)學(xue)工(gong)(gong)(gong)業之母；。工(gong)(gong)(gong)業鹽(yan)(yan)(yan)(yan)指原鹽(yan)(yan)(yan)(yan)，可(ke)(ke)分為(wei)(wei)湖(hu)鹽(yan)(yan)(yan)(yan)、井鹽(yan)(yan)(yan)(yan)和(he)海鹽(yan)(yan)(yan)(yan)。由于海鹽(yan)(yan)(yan)(yan)中(zhong)的(de)(de)海水被多種元素溶(rong)解，海鹽(yan)(yan)(yan)(yan)的(de)(de)工(gong)(gong)(gong)業價值(zhi)相對較(jiao)高，食用(yong)(yong)價值(zhi)較(jiao)低(di)。工(gong)(gong)(gong)業鹽(yan)(yan)(yan)(yan)的(de)(de)范圍很(hen)廣(guang)，是(shi)(shi)一個通用(yong)(yong)術(shu)語(yu)。原鹽(yan)(yan)(yan)(yan)和(he)水洗鹽(yan)(yan)(yan)(yan)可(ke)(ke)以成為(wei)(wei)工(gong)(gong)(gong)業鹽(yan)(yan)(yan)(yan)。這(zhe)里簡單介紹一下(xia)粗鹽(yan)(yan)(yan)(yan)是(shi)(shi)如何(he)用(yong)(yong)作(zuo)(zuo)輔助肥料(liao)(liao)的(de)(de)。除氯(lv)化(hua)(hua)鈉(na)(na)外，粗鹽(yan)(yan)(yan)(yan)的(de)(de)主要成分還含有鎂、鉀、硫以及(ji)作(zuo)(zuo)物(wu)所需的(de)(de)少(shao)量(liang)(liang)(liang)硼、碘等營養元素。雖然(ran)它(ta)不是(shi)(shi)作(zuo)(zuo)物(wu)的(de)(de)直接(jie)肥料(liao)(liao)，但只(zhi)需合理施用(yong)(yong)，對一些喜鈉(na)(na)作(zuo)(zuo)物(wu)有很(hen)好的(de)(de)效果(guo)。例如，在(zai)甜菜和(he)芹菜等作(zuo)(zuo)物(wu)上(shang)施用(yong)(yong)農(nong)用(yong)(yong)鹽(yan)(yan)(yan)(yan)，不僅(jin)可(ke)(ke)以提(ti)高產(chan)量(liang)(liang)(liang)，還可(ke)(ke)以提(ti)高和(he)改善甜菜和(he)芹菜等喜鈉(na)(na)作(zuo)(zuo)物(wu)的(de)(de)質量(liang)(liang)(liang)。但是(shi)(shi)，稻田不應長期單獨(du)施用(yong)(yong)過(guo)量(liang)(liang)(liang)的(de)(de)農(nong)用(yong)(yong)鹽(yan)(yan)(yan)(yan)。否則(ze)，鈉(na)(na)離子會破壞土(tu)壤的(de)(de)優良結構，導(dao)致(zhi)干燥時硬化(hua)(hua)和(he)開裂，潮(chao)濕時腐爛和(he)粘稠(chou)，滲透性差，耕作(zuo)(zuo)不當。因此，粗鹽(yan)(yan)(yan)(yan)可(ke)(ke)以作(zuo)(zuo)為(wei)(wei)補充肥料(liao)(liao)，在(zai)增加有機肥施用(yong)(yong)量(liang)(liang)(liang)的(de)(de)基礎上(shang)合理施用(yong)(yong)，不能(neng)多施或逐年(nian)施用(yong)(yong)。施用(yong)(yong)粗鹽(yan)(yan)(yan)(yan)的(de)(de)方法：通常，粗鹽(yan)(yan)(yan)(yan)與(yu)人畜糞(fen)便等有機肥料(liao)(liao)混合，并(bing)作(zuo)(zuo)為(wei)(wei)基肥堆肥。在(zai)苗木移栽過(guo)程中(zhong)，它(ta)也可(ke)(ke)以被幼苗根部(bu)染色，也可(ke)(ke)以直接(jie)用(yong)(yong)作(zuo)(zuo)追(zhui)肥。每(mei)畝用(yong)(yong)量(liang)(liang)(liang)以5～8kg為(wei)(wei)宜。