Composite scale inhibitor as well as preparation method and application thereof

Abstract

The invention discloses a composite scale inhibitor, comprising sodium polyaspartate and hydroxy-ethylidene-di-phosphonic acid in the mass ratio of 1:20-1:1. The composite scale inhibitor can be prepared by mixing the sodium polyaspartate with the hydroxy-ethylidene-di-phosphonic acid according to the mixture ratio, adjusting the pH value to be 1-5 and uniformly stirring. The composite scale inhibitor is applied to equipment for preparing salts and is especially suitable for mirabilite type brine vacuum equipment for preparing salt; and when the composite scale inhibitor is applied, the addition of refined brine water is 5-25mg / L. The binary composite scale inhibitor has favorable scale inhibiting effect and corrosion inhibiting effect, thereby effectively preventing the system and the equipment for preparing salts from being scaled due to the continuous enrichment of calcium and magnesium ions in the mirabilite type brine water; and the scale inhibiting rate is over 94 percent. Whenin use, the composite scale inhibitor is simple for preparation, convenient for operation and relatively low in cost, so that the composite scale inhibitor has favorable practicability and the use value.

Description

technical field [0001] The invention relates to a composite scale inhibitor, in particular to a composite scale inhibitor for salt making equipment, a preparation method and application thereof. Background technique [0002] In the production of salt, the fouling of pipelines such as the evaporation tank, heating chamber and preheater of the main equipment of salt production is a common problem in the salt production industry. Once the salt production equipment and related pipelines are scaled, the effective volume of equipment and pipelines will be reduced. , so that the heat transfer efficiency is reduced, the production conditions are deteriorated, and the production capacity is reduced. Severe fouling will also force the production to stop, shorten the effective production time, reduce the life of the equipment or even damage the equipment, and increase the consumption of raw materials and energy. [0003] At present, the usual method is to stop production from time to t...

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Problems solved by technology

[0002] In the production of salt, the fouling of pipelines such as the evaporation tank, heating chamber and preheater of the main equipment of salt production is a common problem in the salt production industry. Once the salt production equipment and related pipelines are scaled, the effective volume of equipment and pipelines will be reduced. , so that the heat transfer efficiency is reduced, the production conditions are deteriorated, and the production capacity is reduced. Severe fouling will also force the production to stop, shorten the effective production time, reduce the life of the equipment or even damage the equipment, and increase the consumption of raw materials and energy.

[0003] At present, the usual method is to stop production from time to time for cleaning and descaling. However, this will inevitably have a lot of impact. On the one hand, it will reduce the effective production time, thereby affecting the production volume; material corrosion

At present, most mine salt brine is calcium sulfate type brine. Before entering the vacuum salt making system, certain treatment methods are required to purify the brine to remove Ca in the brine. 2+ , Mg 2+ , due to Ca in brine 2+ , Mg 2+ It is impossible to remove the plasma completely, and when the brine evaporates and concentrates, it will still accumulate on the inner walls of equipment pipes such as heating chambers, evaporator tanks, and preheaters to form a dense and solid carbonate scale layer, so it is very important in the process of brushing tanks or cleaning. Difficult to brush off the dirt layer

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