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Method for producing light active calcium carbonate

A technology of activated calcium carbonate and light calcium carbonate, applied in the direction of calcium carbonate/strontium/barium, fibrous fillers, etc., can solve the problems of insignificant improvement in application performance, high power consumption and energy consumption, long process, etc. The effect of suppressing secondary aggregation, good dispersibility, and increasing filling amount

Inactive Publication Date: 2003-11-19
ZHEJIANG CHANGSHAN JINXIONG
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Problems solved by technology

[0008] In order to improve its application performance, surface treatment can become various light active calcium carbonate. According to the process of realizing light active calcium carbonate, there are currently two types, that is, dry production of light active calcium carbonate. The finished product or dried It is obtained by kneading solid-phase activation reaction of pulverized light calcium carbonate powder and surface treatment agent at a certain temperature and ratio. It has the characteristics of simple process and low production cost, but the particle size is large, the dispersion is poor, and the effect of improving application performance is not obvious.
The other is the production of light active calcium carbonate by wet method, which is obtained by adding a surface treatment agent to the calcium carbonate emulsion that has been carbonated and activated in a liquid phase at a certain temperature, concentration and ratio. The characteristic particle size is small, the distribution is relatively uniform, Good dispersion and obvious improvement in application performance, but the process is long, the investment is large, and the power consumption and energy consumption are high

Method used

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  • Method for producing light active calcium carbonate
  • Method for producing light active calcium carbonate

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Effect test

Embodiment 1

[0030] According to the traditional light calcium carbonate production process, the lime is digested and refined by water, and the 3 Add wet calcium stearate (moisture 30%wt) 75Kg (addition is about 2% of finished product calcium carbonate weight) in the refined calcium hydroxide emulsion (analysis calcium hydroxide content is 200g / L), fully stir, pump into the carbonization tower, and then the carbon dioxide (20-35%) gas of passing through purification carries out carbonation reaction to the pH=7-8 of slurry (that is, phenolphthalein does not change red), becomes the calcium carbonate emulsion containing calcium stearate, after dehydration, Drying, crushing and packaging at 100-200°C yields 2.5 tons of finished light active calcium carbonate. The product has been analyzed to reach the first-grade product of HG / T 2567-94. The average particle size is 3.52μm.

Embodiment 2

[0032] According to the traditional light calcium carbonate production process, the lime is digested and refined by water, and the 3 Wet calcium-zinc stearate complex (calcium-zinc ratio is 1, water content 35%wt) 40Kg (addition is about finished product calcium carbonate weight) in the refined calcium hydroxide emulsion (analysis calcium hydroxide content is 200g / L) 1%) and ethanol 30Kg (the addition is about 1.1% of the weight of the finished calcium carbonate), fully stirred evenly, pumped into the carbonization tower, and then the carbonation reaction is carried out to the pH of the slurry by purifying carbon dioxide (20-35%) gas =7-8 (promptly phenolphthalein does not change red), becomes the calcium carbonate emulsion containing calcium stearate, through dehydration, drying at 100-200 ℃, pulverizing and packaging promptly obtains 2.5 tons of finished product light active calcium carbonate. The product has been analyzed to reach the first-grade product of HG / T 2567-94. T...

Embodiment 3

[0034] (1) Preparation of surface treatment agent: add calcium stearate (addition is 2% of calcium carbonate weight) in common stirred tank, then add the ethanol of 1 / 2 calcium stearate amount and appropriate amount of water, fully stir Slurry is made into a slurry with a solid content of about 40%.

[0035](2) Preparation of ordinary light calcium carbonate: according to the traditional production process of light calcium carbonate, add the upper surface treatment agent into the refined calcium hydroxide emulsion, stir well, and pump carbon dioxide into the carbonization tower under a certain control process Carry out carbonation reaction under certain conditions to form calcium carbonate emulsion, after dehydration, drying, crushing and packaging, it becomes the finished light active calcium carbonate. Product reaches HG / T 2567-94 first grade product through analysis, and product has better dispersibility than embodiment 1, 2, and average particle diameter is 2.85 μ m (see a...

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Abstract

A process for preparing the light active calcium carbonate includes such steps as before or during carbonating reaction in the process for preparing light or precipitated calcium carbonate, adding the surfactant prepared from water-insoluble salt of fatty acid, alcohol or ether type surface wetting agent and water, carbonating reacting to obtain calcium carbonate emulsion, dewatering, drying and pulverizing. Its advantages are high granular uniformity, dispersity and thermal stability, and good affinity to organic high polymer.

Description

technical field [0001] The invention relates to a production method of calcium carbonate, in particular to a production method of light active calcium carbonate. Background technique [0002] Calcium carbonate is a very important inorganic chemical product, which is widely used in industries such as rubber, plastics, paper, paint, ink, and medicine. The hydrophilic and oleophobic nature of ordinary calcium carbonate makes the affinity between calcium carbonate and organic polymers poor, and it is easy to form aggregates, resulting in internal defects of polymers and poor mechanical properties. Therefore, as a filler, it only serves as a filler and The effect of reducing costs. After the surface treatment of calcium carbonate, the dispersibility of active calcium carbonate in rubber and plastic products is good, the filling amount is large, the surface of the product is bright, and the mechanical properties are improved. It is an excellent white reinfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C09C1/02
Inventor 岳林海
Owner ZHEJIANG CHANGSHAN JINXIONG
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