Preparation method of magnesite cementing material retarders

Abstract

The invention relates to magnesite cementing material modifiers, in particular to a preparation method of magnesite cementing material retarders. The magnesite cementing material retarders comprise, by mass, 50-60% of water, 15-20% of phosphoric acid, 10-20% of tartaric acid and 5-10% of sodium gluconate. The preparation method includes: adding the raw materials which are weighed by mass into a reaction kettle, and stirring for 60-90 minutes at the normal temperature prior to taking out for packaging. By the preparation method, initial setting time of magnesite cement can be effectively prolonged, operability of slurry is improved, and water-resistant and halogen-resistant performances of products can be improved. Besides, the preparation method can be widely applied to production of various magnesite products in a high-temperature production environment.

Description

technical field [0001] The invention relates to a modifier for a magnesite gelling material, in particular to a preparation method of a retarder for a magnesite gelling material. Background technique [0002] Magnesite cementitious material, also known as magnesite cement, is an air-hardening cementitious material, which has the characteristics of rapid hardening (no high-temperature steam curing), light weight and high strength, fire resistance and heat resistance, low temperature resistance, low corrosion, and good cementation. It is widely used in construction, municipal administration, machinery, agriculture and other fields. However, since the hydration reaction of magnesite cementitious material is an exothermic reaction, its heat of hydration is much higher than that of cement, which leads to a short initial setting time of the slurry, especially at high temperatures (25-40°C ) In the production environment, problems such as insufficient operation and waste of materi...

AI Technical Summary

Problems solved by technology

However, since the hydration reaction of magnesite cementitious material is an exothermic reaction, its heat of hydration is much higher than that of cement, which leads to a short initial setting time of the slurry, especially at high temperatures (25-40°C ) In the production environment, problems such as insufficient operation and waste of materials are prone to occur, which not only affect the appearance of the product, but also have a direct negative impact on the physical and mechanical properties of the product