Potassium perchlorate production technology with zero wastewater discharge and products thereof

Abstract

The invention relates to the technical fields of cleaner production and circulating production, in particular to a potassium perchlorate production technology with zero wastewater discharge and products of the potassium perchlorate production technology. The steps of electrolytic double decomposition are as follows: (1) electrolyzing sodium chlorate to sodium perchlorate; (2) taking potassium chlorate as a double decomposition raw material, and performing double decomposition reaction of potassium chlorate and sodium perchlorate to generate the potassium perchlorate crude materials; and (3) recrystallizing and purifying the potassium perchlorate crude materials to obtain the products, and electrolyzing and recycling double decomposition mother solution sodium chlorate. The invention has the following advantages that: the water in the production process can be recycled, the production wastewater is not discharged, the chromium-containing waste residues in the production are recycled after being extracted simultaneously, and the rest of solid waste residues are used for other purposes, so that the strategic requirements of the sustainable development of the social economy can be met, and the production technology is suitable for popularization; and moreover, the environmental protection problem is completely solved, the product quality is improved, the product purity is high, the firing is fast, the reaction is complete, no residue is caused; and the production technology is safer and more stable, the product cost performance is higher, and the competitive power is stronger.

Description

technical field [0001] The invention relates to the technical field of clean production and circular production, in particular to a zero-emission production process of potassium perchlorate and its products. Background technique [0002] Potassium perchlorate is one of the important varieties of perchlorate, which is mainly used in the manufacture of fireworks, safety matches, explosives, meteorological rockets, civilian ignition coal, oxidants, etc. Hydrogen is mainly used in industries such as petroleum, food, fine chemicals, glass and artificial gemstones, metal smelting, cutting and welding. The traditional process is mostly potassium chloride formulation method such as figure 1 Shown, its technological process is: sodium chlorate is electrolyzed into sodium perchlorate, carries out metathesis reaction with potassium chloride again, cooling centrifugation, promptly makes potassium perchlorate, the metathesis mother liquor after the centrifugation is mainly sodium chlori...

AI Technical Summary

Problems solved by technology

According to the article "Overview of Chlorate and Analysis of Future Development Trend" in No. 7, 2007 of "Inorganic Salt Industry", due to the current recovery process of the double decomposition mother liquor (for the traditional potassium chloride preparation method) is not perfect, or the investment brings The economic benefits are not significant, which inevitably brings environmental problems, which has attracted great attention from the industry

In order to avoid the discharge of waste water containing perchlorate, chlorate and other heavy metals (i.e. double decomposition mother liquor), some manufacturers have used evaporators to evaporate the waste water to dryness, because the evaporated water is too much (production of 1 ton of potassium perchlorate 3m 3 Wastewater), the sodium chloride obtained by evaporation has too high impurity content, no economic value and high energy consumption, so it is abandoned

The main reason for the environmental problems caused by wastewater discharge is that the wastewater contains chlorate, perchlorate and other small amounts of heavy metals (such as lead). Chlorate and perchlorate are used in the production process to cause damage to the anode of the chlorate electrolytic cell, which reduces the service life of the anode of the electrolytic cell. explain

[0003] Because the applicant is located in the upper reaches of the river, it cannot pollute the water body of the river basin where it is located. If the traditional process route is followed, wastewater containing perchlorate, chlorate and other heavy metals will be discharged, which is not in line with the national environmental protection policy and sustainable development. Strategy

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