Method for causticizing corn starch

Abstract

The invention provides a method for causticizing corn starch, which is characterized in that under the condition that the temperature of corn starch feeding water is 40-50 DEG C, materials are simultaneously fed and stirred, and after material feeding is completed, the obtained mixture is fully and uniformly mixed so as to form a suspension liquid; a sodium hydroxide solution with weight and volume percentages of 20% is added into the suspension liquid, and then a sodium hydroxide solid is added into the obtained substance, wherein the mass ratio of the sodium hydroxide solid to corn starch is 4:100; after the temperature of the obtained mixture rises to 65-75 DEG C, the obtained mixture is causticized for one hour; and after water is added into the causticized mixture for constant volume, a corn starch solution is obtained, and then subjected to heat preservation for later use. The corn starch solution prepared by using the method for causticizing corn starches disclosed by the invention is uniform and stable in properties, easy to store and uneasy to go bad; in case that the corn starch solution is used as an iron mineral inhibitor, no 'clustering' phenomenon occurs in the process of preparation, so that the starch utilization rate is high; and the consumption of a beneficiation reagent is reduced by over 5%, and because the causticizing temperature is lowered, the energy consumption is reduced.

Description

technical field [0001] The invention relates to a causticizing method of corn starch. Background technique [0002] Flotation is an important method of mineral separation. Generally, it is necessary to grind the minerals and add mineral dressing agents for separation. In the reverse flotation process of hematite, corn starch is generally used as an inhibitor of iron minerals. [0003] Starch is an important depressant in reverse flotation of non-polar minerals and hematite. It can play an inhibitory role due to the existence of polar groups such as hydroxyl and carboxyl on the deformed starch molecule. Therefore, starch can associate with water molecules through hydrogen bonds, making the mineral particles affected by it become hydrophilic. The causticization of corn starch is actually a modification process. Causticization can lead to a large degree of swelling and hydration of starch aggregates, which makes the oxygen bridges between the starch molecular rings break and...

AI Technical Summary

Problems solved by technology

In this way, raw starch still remains in the feed liquid after gelatinization, which cannot be used, which not only reduces the utilization rate of starch, but more importantly, it will have a negative impact on the beneficiation index