Phosphorus-free water treatment agent for high-concentration iron ion circulating water

Abstract

The invention discloses a phosphorus-free water treatment agent for high-concentration iron ion circulating water. The phosphorus-free water treatment agent comprises a scale and corrosion inhibitor and a high-efficiency dispersing agent, and the adding concentration of the phosphorus-free water treatment agent is 5-20mg/L in terms of supplemented water. The scale and corrosion inhibitor comprises10%-20% of a non-phosphorus scale inhibitor, 30%-40% of an organic corrosion inhibitor, 1%-5% of a copper corrosion inhibitor, 1%-5% of an inorganic corrosion inhibitor and 30%-58% of deionized water. The efficient dispersing agent is prepared from 20%-30% of an organic polymer, 10%-20% of iron ion organic complexing agent and 50%-70% of deionized water. The organic polymer in the phosphorus-freeagent is capable of stabilizing iron ions in circulating water, so that under-scale corrosion caused by forming of stains on equipment surfaces by iron ions is prevented; the iron ion complexing agent is capable of complexing free iron ions in circulating water, disturbing the reaction of Fe<3+> and Fe, and relieving corrosion and the like problems caused by the iron ions in the circulating water.

Description

technical field [0001] The invention belongs to the field of circulating cooling water, and in particular relates to a phosphorus-free water treatment agent for circulating water with high concentration of iron ions. Background technique [0002] Circulating cooling water accounts for more than 80% of industrial water. The recycling of circulating water has significant environmental benefits, economic benefits and social benefits. At present, the purpose of saving water is achieved by increasing the concentration multiple. However, if the concentration of iron ions in the raw water is high Then restrict the improvement of the concentration factor. Part of the water quality in the Songhua River Basin and the Heilongjiang River Basin contains a large amount of iron ions, and the flocculation effect is very poor. The pretreated water still has a high concentration of iron ions. 3+ It can also promote the dissolution of metallic iron into divalent iron and accelerate the corros...

AI Technical Summary

Problems solved by technology

Part of the water quality in the Songhua River Basin and the Heilongjiang River Basin contains a large amount of iron ions, and the flocculation effect is very poor. The pretreated water still has a high concentration of iron ions. 3+ It can also promote the dissolution of metallic iron into divalent iron and accelerate the corrosion of carbon steel; at the same time, Fe 3+ Hydrolyzed to Fe(OH) 3 Colloids, which absorb impurities such as suspended solids in circulating water, form flocs, settle on the surface of the heat exchanger to form dirt, and increase the thermal resistance of dirt, and easily cause under-scale corrosion

Generally, the concentration of iron ions in circulating water is tens of milligrams per liter. When the concentration of iron ions increases to 3 mg / L, the corrosion tendency of equipment in the circulating water system will increase significantly, and the corrosion inhibition effect of water treatment agents will drop significantly. For this water quality The general treatment method is to add manganese sand tanks in the pretreatment device or adopt technologies such as biological purification (patent application number 201210079763.0), but the problems faced are to occupy new sites, increase engineering transformation, and require large investment