CN101967002A

CN101967002A - Method for simultaneously producing superfine calcium carbonate and ammonium carbonate

Info

Publication number: CN101967002A
Application number: CN 201010532199
Authority: CN
Inventors: 朱伟长
Original assignee: Anhui University of Technology AHUT
Current assignee: Anhui University of Technology AHUT
Priority date: 2010-11-03
Filing date: 2010-11-03
Publication date: 2011-02-09

Abstract

The invention provides a method for simultaneously producing superfine calcium carbonate and ammonium carbonate, which comprises the following steps of: adding ammonium bicarbonate in an amount which is 2.05 to 2.30 times that of slaked lime and a proper amount of dispersing agent into the slaked lime serving as a raw material for uniform stirring; grinding at room temperature for 10 to 30 minutes in an enclosed container; and adding a calcium carbonate surfactant, raising the temperature to between 90 and 110 DEG C and continuously grinding for 20 to 50 minutes; and cooling to prepare the superfine calcium carbonate subjected to activating treatment, wherein the grain size of the product is 0.03 to 0.07 micron, and during the reaction, the steam overflowed from the enclosed container is introduced into a condenser to separate out a hydrated ammonium carbonate crystal. The production technology does not need water basically, omits filtering and drying steps, can simultaneously produce the superfine calcium carbonate and ammonium carbonate and greatly reduces the production cost.

Description

A kind of method of producing calcium carbonate superfine powder and volatile salt simultaneously

Technical field:

The present invention relates to the method that a kind of calcium carbonate superfine powder and volatile salt are produced simultaneously.

Background technology:

The carborization that patent ZL200710021447.7 has proposed just directly to prepare calcium carbonate superfine powder in widely used carbonic acid gas feeding slaked lime slurry is converted into indirect carborization, be white lime when dispersion agent exists and the bicarbonate of ammonia solid generate calcium carbonate superfine powder by lapping mode, the ammonia that reaction is overflowed regenerates ammonium bicarbonate precipitation with carbon dioxide reaction in cuvette.The production technique that this invention relates to does not need water substantially, has omitted filtration and drying step, greatly reduces production cost.But ammonia that this production technique is related and carbonic acid gas regenerate ammonium bicarbonate precipitation and still have inconvenience in cuvette, require further improvement.

Summary of the invention:

The present invention improves on patent ZL200710021447.7 basis, adding the bicarbonate of ammonia of white lime amount of substance more than two times reacts, excessive bicarbonate of ammonia decomposes when heating, the ratio of the ammonia that reactive system is overflowed and the amount of substance of carbonic acid gas is about 2: 1, separates out hydration volatile salt crystal in the condensation.

Concrete technical scheme of the present invention is: adding anhydrous sorbitol acid anhydride mono-laurate (Span-20) or anhydrous sorbitol acid anhydride monopalmitate (Span-40) or sorbitan monostearate (Span-60) in the dry hydrate of water content 5-20wt% is dispersion agent, the dispersion agent addition is the 0.5-5.0% of slaked lime solids quality, adding 2.05-2.30 times of bicarbonate of ammonia solid of white lime amount of substance again stirs, room temperature 5-35 ℃ was ground 10-30 minute in encloses container, add lime carbonate surfactant aluminate coupling agent or titanate coupling agent again, addition is the 0.5-3.0% of slaked lime solids quality, being warming up to 90-110 ℃ continues to grind 20-50 minute, obtain the superfine light calcium carbonate that activation treatment is crossed after the cooling, product cut size 0.03-0.07 micron, when above-mentioned reaction was carried out, the steam of overflowing in the encloses container was introduced in the condenser and is separated out hydration volatile salt crystal.

The present invention compares with the described production technique of patent ZL200710021447.7, ammonia and carbonic acid gas direct reaction in condenser that system overflows have generated the hydration volatile salt, and the hydration volatile salt all has application as ammoniation agent in fields such as dyeing and printing auxiliary, fertilizer, medicine, agricultural chemicals, fire-fighting medium, washing composition, rubber.In addition, the carbonic acid gas of the very easy absorption air of hydration volatile salt generates bicarbonate of ammonia.

Embodiment:

Embodiment 1:

Water content 5wt% white lime 200 grams, add anhydrous sorbitol acid anhydride monopalmitate (Span-40) 9.5 grams, adding bicarbonate of ammonia solid 416 grams again stirs, room temperature was ground 30 minutes in encloses container for 30 ℃, add aluminate coupling agent 6 grams again, be warming up to 110 ℃ and continue to grind 20 minutes, obtain the calcium carbonate superfine powder that activation treatment is crossed after the cooling, 0.03 micron of product cut size is separated out hydration volatile salt crystal 2 67 grams in the condenser.

Embodiment 2:

Water content 20wt% dry hydrate 200 grams, add anhydrous sorbitol acid anhydride mono-laurate (Span-20) 1.0 grams, adding bicarbonate of ammonia solid 390 grams again stirs, room temperature was ground 10 minutes in encloses container for 15 ℃, add titanate coupling agent 2 grams again, be warming up to 100 ℃ and continue to grind 30 minutes, obtain the calcium carbonate superfine powder that activation treatment is crossed after the cooling, 0.07 micron of product cut size is separated out volatile salt crystal 2 46 grams in the condenser.

Embodiment 3:

Water content 10wt% dry hydrate 200 grams, add anhydrous sorbitol acid anhydride mono-laurate (Span-60) 2.7 grams, adding bicarbonate of ammonia solid 410 grams again stirs, room temperature was ground 20 minutes in encloses container for 5 ℃, add titanate coupling agent 0.9 gram again, be warming up to 90 ℃ and continue to grind 50 minutes, obtain the calcium carbonate superfine powder that activation treatment is crossed after the cooling, 0.05 micron of product cut size is separated out volatile salt crystal 2 53 grams in the condenser.

Claims

1. method of producing calcium carbonate superfine powder and volatile salt simultaneously, its step is as follows: adding anhydrous sorbitol acid anhydride mono-laurate (Span-20) or anhydrous sorbitol acid anhydride monopalmitate (Span-40) or sorbitan monostearate (Span-60) in the dry hydrate of water content 5-20wt% is dispersion agent, the dispersion agent addition is the 0.5-5.0% of slaked lime solids quality, adding 2.05-2.30 times of bicarbonate of ammonia solid of white lime amount of substance again stirs, room temperature 5-35 ℃ was ground 10-30 minute in encloses container, add the lime carbonate surfactant again, being warming up to 90-110 ℃ continues to grind 20-50 minute, obtain the calcium carbonate superfine powder that activation treatment is crossed after the cooling, product cut size 0.03-0.07 micron, when above-mentioned reaction was carried out, the steam of overflowing in the encloses container was introduced in the condenser and is separated out hydration volatile salt crystal.

2. require 1 described preparation method according to letter of authorization, it is characterized in that the lime carbonate surfactant that is added is aluminate coupling agent or titanate coupling agent, addition is the 0.5-3.0% of white lime quality.