精(jing)制工業(ye)鹽(yan)(yan)(yan)不(bu)同于海(hai)鹽(yan)(yan)(yan)。它(ta)顆(ke)粒小，比表面積大(da)，溶解速度快。然而，由(you)于顆(ke)粒太細，工業(ye)鹽(yan)(yan)(yan)很容易夾帶形成(cheng)浮鹽(yan)(yan)(yan)。在鹽(yan)(yan)(yan)的(de)(de)融(rong)化過程中，它(ta)表現出與(yu)海(hai)鹽(yan)(yan)(yan)完全不(bu)同的(de)(de)特性。精(jing)制工業(ye)鹽(yan)(yan)(yan)的(de)(de)主要成(cheng)分是(shi)什么

精(jing)(jing)制工(gong)(gong)業鹽(yan)(yan)(yan)的主要成分(fen)是(shi)氯化鈉，其中還(huan)含有少量(liang)鈣(gai)(gai)和(he)(he)鎂離子(zi)、硫酸鹽(yan)(yan)(yan)離子(zi)和(he)(he)一些固體不溶性(xing)物質。亞(ya)(ya)硝(xiao)酸鈉一點也(ye)不重要。沒有關于(yu)工(gong)(gong)業鹽(yan)(yan)(yan)中重金(jin)屬含量(liang)的數(shu)據。然而，從常用的角度來看(kan)，工(gong)(gong)業鹽(yan)(yan)(yan)中的重金(jin)屬含量(liang)應(ying)該非常低。精(jing)(jing)制鹽(yan)(yan)(yan)、優質精(jing)(jing)制鹽(yan)(yan)(yan)和(he)(he)各種營養鹽(yan)(yan)(yan)對缺鐵(tie)、鋅、鈣(gai)(gai)等(deng)元素引(yin)起的各種疾病有良好的保健作用，應(ying)大力(li)提倡(chang)。至于(yu)為(wei)什么到處都說工(gong)(gong)業鹽(yan)(yan)(yan)是(shi)亞(ya)(ya)硝(xiao)酸鈉，是(shi)因為(wei)初中和(he)(he)高中的很多化學老(lao)師都會這樣教(jiao)，媒體也(ye)會這么說，但為(wei)什么呢(ni)？因為(wei)亞(ya)(ya)硝(xiao)酸鈉是(shi)鹽(yan)(yan)(yan)，所(suo)以(yi)在(zai)工(gong)(gong)業中經常使用，所(suo)以(yi)通常被稱為(wei)亞(ya)(ya)硝(xiao)酸鈉。然而，亞(ya)(ya)硝(xiao)酸鈉等(deng)雜質的含量(liang)低于(yu)1%

工業(ye)鹽(yan)(yan)(yan)(yan)(yan)在工業(ye)中被(bei)廣泛使用(yong)(yong)(yong)。它(ta)是(shi)(shi)化(hua)(hua)學工業(ye)的(de)基(ji)本原(yuan)料之(zhi)一(yi)，被(bei)稱為(wei)(wei)(wei)；化(hua)(hua)學工業(ye)之(zhi)母；。工業(ye)鹽(yan)(yan)(yan)(yan)(yan)指原(yuan)鹽(yan)(yan)(yan)(yan)(yan)，可(ke)分為(wei)(wei)(wei)湖鹽(yan)(yan)(yan)(yan)(yan)、井(jing)鹽(yan)(yan)(yan)(yan)(yan)和(he)(he)海(hai)鹽(yan)(yan)(yan)(yan)(yan)。由于(yu)海(hai)鹽(yan)(yan)(yan)(yan)(yan)中的(de)海(hai)水被(bei)多(duo)種元素溶解，海(hai)鹽(yan)(yan)(yan)(yan)(yan)的(de)工業(ye)價值相(xiang)對較高，食用(yong)(yong)(yong)價值較低。工業(ye)鹽(yan)(yan)(yan)(yan)(yan)的(de)范圍(wei)很廣，是(shi)(shi)一(yi)個通(tong)用(yong)(yong)(yong)術(shu)語(yu)。原(yuan)鹽(yan)(yan)(yan)(yan)(yan)和(he)(he)水洗鹽(yan)(yan)(yan)(yan)(yan)可(ke)以(yi)成(cheng)為(wei)(wei)(wei)工業(ye)鹽(yan)(yan)(yan)(yan)(yan)。這里簡(jian)單介紹一(yi)下粗(cu)(cu)鹽(yan)(yan)(yan)(yan)(yan)是(shi)(shi)如何用(yong)(yong)(yong)作(zuo)(zuo)輔助(zhu)肥(fei)料的(de)。除氯化(hua)(hua)鈉(na)外，粗(cu)(cu)鹽(yan)(yan)(yan)(yan)(yan)的(de)主要成(cheng)分還含有(you)鎂、鉀、硫以(yi)及(ji)作(zuo)(zuo)物所需(xu)的(de)少(shao)量硼、碘等(deng)營養(yang)元素。雖然它(ta)不是(shi)(shi)作(zuo)(zuo)物的(de)直(zhi)接肥(fei)料，但只需(xu)合理施(shi)(shi)用(yong)(yong)(yong)，對一(yi)些喜(xi)鈉(na)作(zuo)(zuo)物有(you)很好的(de)效果。例如，在甜(tian)菜和(he)(he)芹菜等(deng)作(zuo)(zuo)物上(shang)施(shi)(shi)用(yong)(yong)(yong)農用(yong)(yong)(yong)鹽(yan)(yan)(yan)(yan)(yan)，不僅可(ke)以(yi)提高產(chan)量，還可(ke)以(yi)提高和(he)(he)改(gai)善甜(tian)菜和(he)(he)芹菜等(deng)喜(xi)鈉(na)作(zuo)(zuo)物的(de)質量。但是(shi)(shi)，稻田不應長期單獨(du)施(shi)(shi)用(yong)(yong)(yong)過(guo)量的(de)農用(yong)(yong)(yong)鹽(yan)(yan)(yan)(yan)(yan)。否則，鈉(na)離(li)子會(hui)破(po)壞土(tu)壤的(de)優良結構，導致干燥時硬(ying)化(hua)(hua)和(he)(he)開裂(lie)，潮濕時腐爛和(he)(he)粘稠，滲透性差，耕作(zuo)(zuo)不當。因(yin)此，粗(cu)(cu)鹽(yan)(yan)(yan)(yan)(yan)可(ke)以(yi)作(zuo)(zuo)為(wei)(wei)(wei)補充肥(fei)料，在增加有(you)機(ji)肥(fei)施(shi)(shi)用(yong)(yong)(yong)量的(de)基(ji)礎上(shang)合理施(shi)(shi)用(yong)(yong)(yong)，不能多(duo)施(shi)(shi)或逐(zhu)年施(shi)(shi)用(yong)(yong)(yong)。施(shi)(shi)用(yong)(yong)(yong)粗(cu)(cu)鹽(yan)(yan)(yan)(yan)(yan)的(de)方法：通(tong)常，粗(cu)(cu)鹽(yan)(yan)(yan)(yan)(yan)與(yu)人畜糞便等(deng)有(you)機(ji)肥(fei)料混合，并作(zuo)(zuo)為(wei)(wei)(wei)基(ji)肥(fei)堆肥(fei)。在苗木移栽過(guo)程中，它(ta)也(ye)可(ke)以(yi)被(bei)幼苗根部染(ran)色，也(ye)可(ke)以(yi)直(zhi)接用(yong)(yong)(yong)作(zuo)(zuo)追肥(fei)。每畝用(yong)(yong)(yong)量以(yi)5～8kg為(wei)(wei)(wei)宜。