关键词: 工业废盐, 减量化, 无害化, 资源化, 杂质

Abstract: Large amount of industrial waste salt was generated during the organic and inorganic chemical processes, and most of the salts were produced in the pesticide manufacture industry, followed by the fine chemical industry and pharmaceutical industry. At present, the treatment and disposal of industrial waste salt focused on reduction, harmless and resource recycling. The commonly used reduction treatment techniques included recrystallization, precipitation-recrystallization, salt washing and extraction, but they were rarely applied in practical engineering. Harmless treatment technologies included neutralization detoxification, heat treatment, solidification and landfill, and wet oxidation technology, among which the solidification and landfill were commonly used. Resource recycling technology included ion membrane caustic soda, recovery of valuable metals, and preparation of cement, soda ash and sodium dihydrogen phosphate. Resource recycling of industrial waste salt was encouraged and supported by the country, while it was highly restricted by technology, cost, market and other factors. Therefore, high efficient, low cost and composite recycling technology, and coupling multiple technologies into a composite process need to be developed in the future, in order to strengthen the removal of impurities in industrial waste salt and improve competitiveness of product. In addition, the product quality detection and environmental pollution risk assessment for the recycled products should be strengthened during the resource recycling process.

Key words: industrial waste salt, reduction, harmless, recycling, impurities