Chinese Coking Industry Association, honorary president Huang Jingan believes that the desulfurization waste liquor of ammonium thiocyanate

Chinese Coking Industry Association, honorary president Huang Jingan believes that the desulfurization waste liquor of ammonium thiocyanate, ammonium sulfate extraction is a very important chemical raw materials, especially thiocyanate, widely used in pharmaceutical and chemical intermediates and synthetic pesticides Tricyclazole, Ye Qing double and printing and dyeing auxiliary agent, flotation, pan has more application in the precious metal spinning solvent, rubber processing and photographic industry, the market capacity is very large. Ammonium sulfate is a common chemical raw materials and chemical fertilizer, sulfur is one of the most common chemical raw materials, has a very high value of industrial and agricultural use.

The composition of HPF desulfurization wastewater with inorganic salt, such as sulfate, sulfite, thiosulfate, thiocyanate, the other contains a small amount of tar and HPF catalyst, COD 100000mg/l above, ammonia nitrogen is greater than 45000mg/l, high concentration of pollutants, conventional treatment is difficult to meet the demand.” Chinese Academy of Sciences Institute of process engineering environment resource technology and engineering research group, Dr. Liu Chenming said, the development of a new desulfurization waste water resource process is imminent.

The new technology of exploration results

According to Dr. Liu Chenming, on the basis of comparison and Research on the traditional desulfurization wastewater treatment process, process engineering research China academy so FGD coking plant of Anshan Iron and steel as the research object, the development of the desulfurization wastewater resource utilization technology.

The new technology will first use of catalytic oxidation of sulfite and thiosulfate into sulfate, and thiocyanate precipitate separation and other substances, and thiocyanate precipitation combined into high added value and wide range of industrial uses Sodium thiocyanate And potassium thiocyanate. The desulfurization waste water after treatment, which was almost entirely by salt extraction, salt content is greatly reduced, can be used as desulfurization liquid for desulfurization of coke oven gas, so the desulfurization liquid can be used repeatedly.

Liu Chenming introduction, the research group in Angang coking plant test results showed that the process can produce 97% purity sodium thiocyanate product and nitrogen content can reach more than 20% products of ammonium sulfate, the catalyst can be recycled. Beijing City chemical products quality supervision and inspection station of chemical and plastic products inspection and testing center, resource and harmlessness of the process to achieve HPF desulfurization wastewater; and has practical application value to solve the environmental protection by desulfurization liquid, can be applied for industrial application. Environmental technology innovation

Coking Desulfurization Waste Liquor Extraction Technology was salt environmental technology, but to the Coking Desulfurization Waste Liquor Extraction of salt field hold feet, must according to the standards of environmental protection industry and coking enterprises more strict requirements for the advanced design.

We know that the traditional coking wastewater extraction technology to solve the mixed salt salt extraction from Coking Desulfurization Waste Liquor, but the extraction of mixed salt with the change of the downstream market is already saturated, do not sell out. At this time, if there is no deep processing, salt sold will become the new mixed pile up like a mountain hand, the burden of coking enterprises.

Fortunately, research institutions have developed mixed salt depth utilization process. The new technology gets rid of the disadvantages of traditional environmental protection technology, through the catalytic oxidation reaction of the mixed salt is further processed into higher value-added basic chemical raw materials, and through the improvement of chemical formula, can continue to adapt to market demand and produce more end products, the comprehensive utilization of desulfurization waste to the depth and breadth of development. This technology can achieve the sustainable development of environmental protection.