Waste salt resourceful treatment process and special equipment thereof

Abstract

The invention discloses a waste salt resourceful treatment process and special equipment thereof. The waste salt resourceful treatment process comprises the following steps: separately adding waste salt which mainly comprises sodium chloride and sodium sulfate into saturated salt water of sodium chloride and sodium sulfate to continuously stir, filtering to obtain mother liquor from salt wash, anddrying separated-out sodium chloride and sodium sulfate solids; freezing mother liquor from salt wash, evaporating and crystallizing crystals, chemically removing impurities of frozen mother liquor,removing organic and inorganic impurity ions, performing organic separation on impurity-removal outlet water, utilizing the mother liquor inside a field, oxidizing produced water, performing nano-filtration salt separation on oxidizing produced water, returning nano-filtration concentrated water into a salt washing system, evaporating and drying nano-filtration produced water to obtain sodium chloride solid. A series of processes such as salt washing, freezing, organic separating, oxidizing, nano-filtration salt separation, and evaporating are effectively combined, so that sodium chloride andsodium sulfate in the waste salt are separated and purified, and organic substances and other impurity irons in the waste salt are effectively separated or removed, and therefore, hazardous waste treatment cost is reduced, resourceful treatment of two waste salts is realized, and an economic value is created.

Description

technical field [0001] The invention relates to the technical field of industrial waste salt treatment, in particular to a process and special equipment for separation and recycling of industrial waste salt. Background technique [0002] In recent years, with the rapid development of my country's economy, the amount of waste salt produced in the process of wastewater treatment in domestic and foreign power petrochemical and coal chemical industries has also shown an increasing trend. At present, the annual output of waste salt exceeds 20 million tons, which has been It is classified as hazardous waste, and the national environmental protection department requires strict control. Undisposed waste salt is easy to be leached, which can directly affect surface water and groundwater pollution, damage the surrounding ecological environment, lead to soil salinization and endanger human health. Therefore, whether the waste salt can be properly treated and utilized has become a key p...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a waste salt resource treatment process and its special equipment for the above-mentioned existing hazardous waste miscellaneous salt treatment process complex, difficult separation of organic matter, high energy consumption, and high implementation cost. The effective combination of a series of processes such as freezing, organic separation, oxidation, nanofiltration salt separation, and evaporation can separate and purify sodium chloride and sodium sulfate in waste salt. The process is clear and controllable, and the organic matter and The effective separation or removal of other impurity ions can effectively reduce the pollution of waste salt to the surrounding environment, reduce the cost of hazardous waste disposal, realize the recycling of two kinds of waste salt, and create economic value

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