Preparation method of high retention heavy calcium carbonate

A technology of heavy calcium carbonate and heavy calcium carbonate powder, applied in the direction of calcium carbonate/strontium/barium, inorganic compound addition, etc., can solve the problems of difficulty in increasing production cost, low retention rate, high abrasion of heavy calcium carbonate, and achieves Conducive to environmental protection, improve retention rate, reduce the effect of wood pulp consumption

Active Publication Date: 2007-07-18
SHANGHAI DONGSHENG NEW MATERIALS
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Problems solved by technology

However, heavy calcium carbonate has high wear on the net and low retention rate, which increases the production cost and the difficulty of papermaking white water treatment
Chinese patent CN1122309A method for wet preparation of superfine heavy calcium carbonate, Chinese patent CN 1095080A superfi

Method used

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  • Preparation method of high retention heavy calcium carbonate

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Experimental program
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Effect test

Embodiment 1

[0017] Add 4 tons of 100 mesh heavy calcium carbonate powder to 7.4 tons of deionized water, stir to make a slurry, and add 8kg of sodium polyacrylate dispersant to the slurry, and stir. Slurry is sent into a 300 liters of peeling machines with pump then, heavy calcium carbonate is ground with peeling machine, makes heavy calcium carbonate slurry, wherein is less than 2 μm content 20%.

[0018] Add 8kg dodecyl dimethyl benzyl ammonium chloride then in making heavy calcium carbonate slurry, stir 2 hours, then add 20kg hexadecyl dimethyl benzyl in heavy calcium carbonate slurry ammonium chloride, and stirred for 1.5 hours to obtain a high-retention heavy calcium slurry, which can be directly used as paper-making filler.

Embodiment 2

[0020] Add 4 tons of 400-mesh heavy calcium carbonate powder to 3 tons of deionized water, stir to make a slurry, and add 20kg of sodium polyacrylate dispersant to the slurry, and fully stir to make the slurry obtain good fluidity. Then the slurry is sent into a 300-liter sand mill with a pump, and the heavy calcium carbonate is ground with the sand mill to obtain a heavy calcium carbonate slurry, wherein the content of less than 2 μm is 60%. Then add 40kg dodecyl dimethyl benzyl ammonium bromide in the heavy calcium carbonate slurry, stir 1 hour, then add 80kg octadecyl dimethyl benzyl in the heavy calcium carbonate slurry ammonium chloride, and stirred for 2 hours to obtain a high-retention heavy calcium slurry, which was filtered to make 5.6 tons of filter cakes with a solid content of 70%, which can be directly used as papermaking fillers.

Embodiment 3

[0022] Add 4 tons of 600-mesh heavy calcium carbonate powder to 1.3 tons of deionized water, stir to make a slurry, and add 80kg of sodium polyacrylate dispersant to the slurry, and fully stir to make the slurry obtain good fluidity. Slurry is sent into an 80 liters of peeling machine with pump then, heavy calcium carbonate is ground with peeling machine, makes heavy calcium carbonate slurry, wherein is less than 2 μm content 30%. Add 80kg dodecyl dimethyl benzyl ammonium chloride then in the heavy calcium carbonate slurry, stir 1.5 hours, then add 200kg octadecyl dimethyl benzyl in the heavy calcium carbonate slurry Ammonium chloride was stirred for 2.5 hours to obtain a high-retention heavy calcium slurry. The slurry is filtered to make 6.9 tons of filter cake with a solid content of 60%, dried at 105°C for 3 hours, and then pulverized by a hammer mill to obtain 4.1 tons of high-retained heavy calcium powder, which can be used as papermaking filler.

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Abstract

This invention discloses a preparation method that high remains water-ground limestone and its application. Add water-ground limestone in water, add sodium polyacrylate dispering agent in water, mix, get water-ground limestone mortar, grind, prepare water-ground limestone mortar, wherein content of less than 2mum is 20-60%; add cationic surfactant in mortar, mix 0.5-3.0 hours, add cationic surfactant in mortar, mix 0.5-3.0 hours, get high remaining water-ground limestone mortar. This high remaining water-ground limestone, which is used as paper fillers, can increase first - pass retention and total retention of bulking agent, and increase fiber retention. It profits to decrease water density, bulking agent dosage, wood pulp dosage, abrasion for papermachine forming fabric, and cost, and protect environment.

Description

technical field [0001] The invention relates to the technical field of a method for preparing heavy calcium carbonate, in particular to a method for preparing high-retention heavy calcium used as papermaking raw materials. Background technique [0002] There are many factors restricting the development of the paper industry, among which the long-term unreasonable structure of fiber raw materials and insufficient effective supply are the bottleneck problems. One very important reason is that the cost of papermaking is too high. As a result, the economic benefits of papermaking enterprises are not ideal, and papermaking fibers mainly come from wood pulp and wheat straw. Wheat straw pulp is seasonal, coupled with the implementation of straw returning technology, it is more difficult to purchase wheat straw, and wheat straw pulp is greatly restricted in terms of environmental protection and product quality, so the market proportion of wheat straw will also decrease. [0003] U...

Claims

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Application Information

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IPC IPC(8): C01F11/18D21H17/66
Inventor 施晓旦王彦华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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