The problem of industrial waste salt and its resource utilization approaches

Author：

Sources, Classification, and Properties of Industrial Waste Salt
Industrial waste salt usually refers to solid waste generated in the industrial production process, mainly composed of inorganic salts. These wastes mainly come from multiple industries such as high salt wastewater treatment and pesticide production. According to statistics, China produces over 2.0 industrial waste salts annually × 107t, most of which comes from the production of pesticides and dyes.
According to the source classification, industrial waste salt can be mainly divided into the following categories:
1. Waste salt generated by the pesticide industry accounts for approximately 30% of the total amount.
2. Waste salt generated by the pharmaceutical industry accounts for approximately 10% of the total amount.
3. Waste salt generated by the fine chemical industry accounts for approximately 15% of the total amount.
4. Waste salt generated by industries such as printing and dyeing accounts for approximately 45% of the total amount.
In addition, from the situation in Jiangsu Province, the sources of salt containing waste are more specific, mainly from industries such as dye intermediates, pharmaceutical intermediates, pesticide intermediates, coal chemical industry, and wet metallurgy.
According to the composition of industrial waste salt, it can also be divided into single salt and mixed salt. Single salt refers to a salt containing a single component, while mixed salt refers to a salt containing two or more components. In industrial waste salt, the proportion of mixed salt is relatively high, about 80%, and the remaining 20% is single salt.
Industrial waste salt has some significant properties, which pose many challenges in its treatment and disposal. Firstly, industrial waste salt has a complex composition and a wide range of sources. Secondly, these waste salts have high toxicity, and if not handled properly, they may cause serious harm to the environment and human health. For example, organic matter and other impurities contained in certain waste salts may cause pollution of soil and groundwater.
Although industrial waste salts are not separately listed in the National Catalogue of Hazardous Wastes, in reality, certain industrial waste salts have been clearly defined as hazardous waste. For example, the waste mother liquor and reaction base waste generated during the production process of chemical synthesis raw materials are clearly listed as hazardous waste.
The disposal and resource utilization of industrial waste salt is an important issue. At present, the disposal methods for industrial waste salt at home and abroad mainly include landfill method, high-temperature oxidation method, salt washing method, etc. However, these methods all have some limitations, such as high investment and high landfill costs.
Therefore, achieving the resource utilization of industrial waste salt is a direction worth exploring. The key to resource utilization lies in removing organic matter from waste salt and conducting salt separation treatment in order to obtain a single component of salt. This process requires solving some technical difficulties, such as the viscosity and corrosiveness of the equipment, and the stability of the operating process.
Conclusion: The disposal and resource utilization of industrial waste salt is an important environmental issue. In order to achieve effective treatment and resource utilization of waste salt, it is necessary to comprehensively consider various factors, including the nature, source, treatment technology, and economic cost of waste salt. Through continuous technological innovation and improvement, we are expected to find more economical, efficient, and environmentally friendly methods to treat and utilize industrial waste salts, thereby achieving a win-win situation for both the economy and the environment.

Related Products