Wet-method preparation and activation method of nanometer calcium carbonate

Abstract

The invention discloses a wet-method preparation and activation method of nanometer calcium carbonate. Limestone is calcined and crushed, wherein a crusher is adopted for crushing, the crushed particle size is 1-2 cm, then limestone particles are put into a calcinator for calcining, calcining time is 120-360 min, temperature is 900 DEG C, in a calcining process, a fluidized bed is arranged in thecalcinator, and the limestone particles are subjected to fluidized calcining in the fluidized bed; quicklime is obtained, water is added, stirring is conducted to obtain slaked lime, and stirring is conducted for 30-60 min; the slaked lime is put into an activation reaction kettle, water adding is continued, meanwhile, heating is conducted for stirring, heating temperature is 45-65 DEG C, in an activation device, carbon dioxide is introduced for bubbling, and an activator is added while stirring to accelerate activation; wet calcium carbonate is obtained; after sedimentation and filtering areconducted, a filter press is used for filter pressing; the wet calcium carbonate subjected to press filtering is dried. The activation method has the advantages that the calcining speed is higher thanthat in the prior art, a calcining effect is good, and energy consumption is saved; the activation rate is improved.

Description

technical field [0001] The invention relates to the field of wet activation of calcium carbonate, in particular to a nanoscale calcium carbonate wet preparation and activation method. Background technique [0002] In recent years, with the development of calcium carbonate technology, calcium carbonate products are increasingly showing a trend of nanoscale, and generally light calcium carbonate with an average particle size of 1-100nm becomes nano calcium carbonate. The advantages of nano-calcium carbonate are: small particle size, the average particle size is 50nm, the larger the specific surface area, more than three times larger than ordinary calcium carbonate; after the surface is activated, the activation rate is high, the whiteness is high, and it is suitable for light-colored products. Nano-scale calcium carbonate is mainly used in: rubber, plastics, advanced inks, coatings and other fields. [0003] The preparation methods of nano-scale calcium carbonate in the prior...

AI Technical Summary

Problems solved by technology

The carbonization method in the prior art prepares nanoscale calcium carbonate and has the following problems: 1. In the existing calcination technology, the temperature of calcination and the particle diameter oil pipe of calcination, when the existing calcination furnace calcines, the calcination temperature after calcination is 900 When the calcination temperature is 1000 degrees Celsius, it can burn through 3.3mm of limestone per hour; if the calcination temperature is 1000 degrees Celsius, it can burn through 6.6mm of limestone per hour; if the calcination temperature is 1100 degrees Celsius, it can burn through 14mm of limestone per hour; 10mm of limestone can be burnt per hour; therefore, the calcination temperature is high, resulting in high calcination cost; 2. The existing carbonization wet activation speed is slow, and the obtained nano-scale calcium carbonate has a large particle size