Sodium Chlorate Application and Background

Sodium chlorate is an important inorganic chemical product that has a wide range of applications in the world. International sodium chlorate 92% for pulp and drinking water treatment of raw materials: North America sodium chloride 98% for pulp and paper industry, the remaining 2% for the preparation of chlorate, mining and so on. 78% of sodium chlorate in Europe for the paper industry, 7.8% for the manufacture of other chlorate, chlorite, 4.2% for the manufacture of herbicides, the remaining 4% for uranium and other. Japan’s sodium chlorate 73% for the paper industry, 6% for the preparation of oxidants and other chlorates, 5% for herbicides, 16% for the textile and other industries. At present, the world sales of sodium chlorate is about 3 million tons, the manufacturers are mainly concentrated in North America (Canada, the United States) and the Nordic (Scotland, Sweden). North American production is about 1.7 million tons / year, the Nordic production is about 720,000 tons / year, Japan production is about 80,000 tons / year. Canada and the United States production capacity of more than 1.9 million tons / year, Sweden, France, sodium chloride production is also 200,000 tons / year or more. The United States is a large consumption of sodium chlorate, although the continuous expansion of new devices still need to import from Canada, Sweden and other countries to meet the pulp bleaching, drinking water treatment and other needs. In Europe, Sweden, France and other countries, pulp and paper products manufacturers with chlorine dioxide as bleach the rapid development. In Japan, its demand is also rising year after year, is the long-term import of sodium chlorate.

The reason why the use of chlorine dioxide bleach is the reason: First, the need for environmental protection work, the use of traditional methods with chlorine bleached pulp will produce strong carcinogens, but also easy to form with the water humus chlorinated hydrocarbons, and water Phenols form a strange smell of chlorophenols, and water in the formation of ammonia on the fish and human are harmful chloramine, and long-term use of chlorine can cause some of the water resistance of microorganisms, pollution of underground water is not conducive to environmental protection. At present, Europe and North America have legislation to prohibit the use of chlorine bleaching in the paper industry; the second is chlorine dioxide and other bleaching agents compared to its bleaching performance, and its oxidation potential is moderate, can effectively deal with the pigment attached to the fiber And dirt without affecting its fiber strength, and the pulp fabric whiteness from the original chlorine bleaching 75 ° to 85 °. Bleed pulp with chlorine dioxide, the production of paper in the humid air does not extend over time and yellow discoloration, to ensure the quality of paper products, the value is relatively high. Up to now, there has been no alternative to chlorine dioxide in terms of cost and pulp whiteness and strength. Therefore, the use of chlorine bleach pulp in the field of pulp will soon be replaced by chlorine dioxide bleaching.

Sodium chlorate in water treatment is mainly the application of sodium chlorate derived chlorine dioxide. In urban drinking water and sewage treatment, the international community usually use three kinds of disinfection methods, namely liquid chlorine disinfection, chlorine dioxide disinfection and ozone disinfection, China is basically using liquid chlorine disinfection. The use of liquid chlorine disinfection, in the sterilization at the same time, but also bring free chlorine on the various organic matter chlorination, in the water which produce chloroform, dioxin, chlorophenol and other speech carcinogens, endangering human health.

In recent years, the relevant state departments in the investigation of drinking water quality found that drinking water in a variety of different properties of organic matter in more than 300 kinds, of which the most prominent content of chloroform, drinking water in some places the amount of trichloromethane 310 shake g / L. Chlorine dioxide and liquid chlorine disinfection compared to the two disinfection system is very similar, but the chlorine dioxide disinfection does not produce organic matter with water, chloroform, does not produce amine chloride, but can destroy the phenol, sulfide, oxidation And other organic matter; compared with ozone disinfection, chlorine dioxide disinfection less investment, high yield, long residence time in the water, can effectively kill and control a variety of bacteria, but also with the water bromide , Hypochlorite reaction, resulting in harmful substances on the human body. It can be seen that chlorine dioxide is not only a more effective than liquid chlorine fungicide and kill the virus, and its oxidation capacity after ozone (investment is lower than ozone), disinfection process almost no formation of chloroform and volatile Organic chlorine, while the total organic chlorine is also much less than the liquid chlorine, the replacement of liquid chlorine has become inevitable in the times. At present, chlorine dioxide in Europe and the United States has been widely used, and China has just started, many research institutes and water companies have been carried out research, and achieved certain results.