A kind of technology that prepares calcium iodate with the brine after zinc oxide rinsing as raw material

Abstract

The invention relates to a technology for preparing calcium iodate by taking brine rinsed with crude zinc oxide as a raw material. The technology comprises the following steps: (1) evaporating and concentrating the brine rinsed with crude zinc oxide, and performing centrifugation to obtain iodine-containing brine; (2) adding hydrochloric acid to the iodine-containing brine, then dropwise adding hydrogen peroxide, when the pH value of the system is 1-2 and no iodine is formed, stopping reacting, and performing filtration to obtain iodine precipitate; (3) adding alkali liquor to the iodine precipitate, and when the pH value of the reaction liquid is 8-9, performing stirred dissolution and filtration to obtain an iodine-containing solution; (4) preparing a chlorate solution, then dropwise adding the iodine-containing solution to the chlorate solution, when the pH value of the system is less than or equal to 1, the temperature is 85-90 DEG C and the reaction liquid is colorless, stopping reacting, and performing filtration to obtain a hydrogen iodate solution; and (5) adding calcium salt to react to produce calcium iodate, filtering the calcium iodate, washing filter cakes, and then, drying the washed filter cakes to obtain a finished product. Technological processes realize the closed production of iodine, the technology and equipment are simple, the economic cost is low, and thetechnology is suitable for industrial automatic production.

Description

technical field [0001] The invention relates to a preparation process of calcium iodate, in particular to a process for preparing calcium iodate by using brine rinsed with sub-zinc oxide as a raw material. Background technique [0002] Iodine is the basic raw material for the manufacture of inorganic and organic iodides, and an essential nutrient element for the human body and plants. It is also widely used in national defense and cutting-edge technology. Iodine is one of the important life elements. It is a component of thyroxine and has a regulating effect on the metabolic rate of organisms. Iodine deficiency can cause goiter, basal metabolic rate and vitality decline, so it is widely used in the production of feed additives . At present, the additives of iodine mainly include potassium iodide, sodium iodide, potassium iodate and calcium iodate, etc., but the first few iodides are not very stable, such as potassium iodide and sodium iodide are easily oxidized and separate...

AI Technical Summary

Problems solved by technology

At present, the additives of iodine mainly include potassium iodide, sodium iodide, potassium iodate and calcium iodate, etc., but the first few iodides are not very stable, such as potassium iodide and sodium iodide are easily oxidized and separated out elemental iodine to reduce the biological potency, but Due to its low solubility and stable properties, calcium iodate is supplemented with calcium salt while supplementing iodine. It is a feed additive widely recognized at home and abroad.

The current process for preparing calcium iodate is usually to oxidize elemental iodine with an oxidant and then react with calcium salt to form a salt. Since elemental iodine is easy to volatilize, it is not only difficult to operate, but also easily causes iodine loss and environmental pollution caused by iodine volatilization.

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