Harmless disposal and comprehensive utilization method for high-salt chemical sludge

Abstract

The invention belongs to the technical field of solid waste disposal, and particularly relates to a harmless disposal and comprehensive utilization method for high-salt chemical sludge. According to the method, negative-pressure cyclic heat storage, incineration and recycling equipment is adopted, maintenance and replacement are easy, the use cost of the equipment is low, harmless disposal of the high-salt chemical sludge can be achieved, salt in the sludge is recycled, the technical problem that the high-salt chemical sludge is fused, forms rings, is caked and the like under the high-temperature condition to cause severe destruction to an incinerator can be solved, the incineration effect is improved, and energy conservation and environmental friendliness are achieved.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a comprehensive utilization method for harmless disposal of high-salt chemical sludge. Background technique [0002] High-salt chemical sludge refers to the sludge that contains organic matter, other toxic and harmful substances, and water produced in industrial production processes, and is mainly composed of inorganic waste salt. It is used in the production process of many fine chemicals, chemical pesticide products or intermediates. , will be accompanied by the production of a large amount of high-salt chemical sludge. For example, for every ton of hydrazine hydrate produced, 4-5 tons of by-product high-salt chemical sludge containing toxic and harmful chemicals will be produced. For every ton of glyphosate pesticide produced , will produce 1.1-1.4 tons of by-product high-salt chemical sludge containing toxic and harmful chemicals. With the developmen...

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Problems solved by technology

[0003] On the one hand, high-salt chemical sludge contains water and is easy to agglomerate, making it difficult to treat; on the other hand, it cannot be directly used as industrial raw materials because it contains toxic and harmful chemicals. Therefore, most of the current treatment methods of most enterprises mainly include the following: Types: ①Salt washing method, washing the salt slag with water or an organic solvent to remove impurities in the salt slag as much as possible, and the treated salt is used in the combined soda industry, but this method is only suitable for by-products with little impurity content and a single impurity component Salt slag is produced, and there are secondary pollution problems such as reprocessing of water or organic solvents used for washing. In addition, the impurities in the by-product salt slag are difficult to clean, and the residual amount is also unstable, making it difficult to realize industrialization; ② high temperature treatment method, The salt residue is treated at high temperature, so that the organic impurities contained in the salt residue are decomposed into gas at high temperature to achieve the purpose of removing organic impurities, but the key to this method lies in the research and development of decomposition equipment. However, this method has engineering problems such as melting, ringing and agglomeration of inorganic salts in high-salt chemical sludge at high temperatures, resulting in the failure of normal operation of the equipment, and it is difficult to realize industrialization; ③Landfill or dumping method, the salt slag is stored in the open air or directly dumped into the river, but this method is simple and crude, and the long-term storage of salt slag not only occupies a large amount of land, but also poses a huge threat to the environment, and these high-salt chemical industries If the soluble salts and toxic and harmful chemicals in the sludge are lost with the rainwater, they will seriously salinize the surrounding soil, destroy the surrounding vegetation, deteriorate the water quality, pollute the water source, and pose a serious threat to people's lives

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