国产91视频在线-国产91丝袜在线观-国产91网站入口-国产91网站在线-国产91午夜福利-国产91一区二区-国产91一区在线-国产91原创视频-国产91在线播放-国产91在线成人

    Industrial salt is widely used in industry and is one of the most basic raw materials in the chemical industry. It is called the "mother of the chemical industry." The main products of basic chemical industry, hydrochloric acid, caustic soda, soda ash, ammonium chloride, chlorine, etc. are mainly used industrial salt as raw material.
    Industrial salt refers to the original salt, salt lake salt, well salt and sea salt points, which because of sea water into a variety of elements dissolved in water, so the industrial value of sea salt is relatively higher, lower edible value.