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A method for rapidly preparing superfine calcium carbonate and co-producing ammonium chloride

A technology of ultra-fine calcium carbonate and ammonium chloride, which is applied in the direction of ammonium chloride, calcium carbonate/strontium/barium, ammonium halide, etc., and can solve the problems of long production cycle of ultra-fine calcium carbonate, uneven product particle size, and low purity , to achieve the effect of fast preparation speed, low cost and high product purity

Active Publication Date: 2016-03-23
LIAONING PETROCCHEM VOCATIONAL & TECH COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method for preparing ultrafine calcium carbonate has disadvantages such as long production cycle, high energy consumption, uneven particle size, and low purity.

Method used

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  • A method for rapidly preparing superfine calcium carbonate and co-producing ammonium chloride
  • A method for rapidly preparing superfine calcium carbonate and co-producing ammonium chloride
  • A method for rapidly preparing superfine calcium carbonate and co-producing ammonium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a, 50g calcium chloride, 71.1g ammonium bicarbonate, 350g water and 0.5g sodium lauryl sulfate are placed in the reactor, stirred until fully dissolved;

[0019] b. Put excess calcium oxide (about 50g) into a container made of sieve, and put the container made of sieve filled with calcium oxide into the reactor. Stir the solution at a speed;

[0020] The following chemical reactions take place in the reactor:

[0021] CaO+H 2 O=Ca(OH) 2

[0022] Ca(OH) 2 +2NH 4 HCO 3 =CaCO 3 ↓+(NH 4 ) 2 CO 3 +2H 2 o

[0023] CaCl 2 +(NH 4 ) 2 CO 3 =CaCO 3 ↓+NH 4 Cl

[0024] C, track and measure the pH value of the solution in the reactor by an acidity meter, when the pH value of the solution=10.0, stop stirring, and take out the container that is made of the screen cloth that fills calcium oxide;

[0025] D, the solid-liquid mixture obtained in the reactor in the step c is filtered with a microporous filter, the solid obtained in the microporous filter is superfine c...

Embodiment 2

[0029] a, 50g calcium chloride, 69g ammonium bicarbonate, 355g water and 0.55g sodium lauryl sulfate are placed in the reactor, stirred until fully dissolved;

[0030] b. Put excess calcium oxide (about 50g) into a container made of sieve, and put the container made of sieve filled with calcium oxide into the reactor. Stir the solution at a speed;

[0031] The following chemical reactions take place in the reactor:

[0032] CaO+H 2 O=Ca(OH) 2

[0033] Ca(OH) 2 +2NH 4 HCO 3 =CaCO 3 ↓+(NH 4 ) 2 CO 3 +2H 2 o

[0034] CaCl 2 +(NH 4 ) 2 CO 3 =CaCO 3 ↓+NH 4 Cl

[0035] C, track and measure the pH value of the solution in the reactor by an acidity meter, when the pH value of the solution=9.8, stop stirring, and take out the container that is made of the screen cloth that fills calcium oxide;

[0036] D, the solid-liquid mixture obtained in the reactor in the step c is filtered with a microporous filter, the solid obtained in the microporous filter is superfine cal...

Embodiment 3

[0040] a, 50g calcium chloride, 72g ammonium bicarbonate, 345g water and 0.45g sodium lauryl sulfate are placed in the reactor, stirred until fully dissolved;

[0041] b. Put excess calcium oxide (about 50g) into a container made of sieve, and put the container made of sieve filled with calcium oxide into the reactor, at 20°C, at 1100r / min Stir the solution at a speed;

[0042] The following chemical reactions take place in the reactor:

[0043] CaO+H 2 O=Ca(OH) 2

[0044] Ca(OH) 2 +2NH 4 HCO 3 =CaCO 3 ↓+(NH 4 ) 2 CO 3 +2H 2 o

[0045] CaCl 2 +(NH 4 ) 2 CO 3 =CaCO 3 ↓+NH 4 Cl

[0046] C, track and measure the pH value of the solution in the reactor by an acidity meter, when the pH value of the solution=10.2, stop stirring, and take out the container that is made of the screen cloth that fills calcium oxide;

[0047] D, the solid-liquid mixture obtained in the reactor in the step c is filtered with a microporous filter, the solid obtained in the microporous fi...

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Abstract

The invention discloses a method for quickly preparing superfine calcium carbonate with a co-product of ammonium chloride. The method comprises the following steps: firstly, completely dissolving calcium chloride, ammonium bicarbonate and sodium dodecyl sulfate by using water; secondly, adding excess calcium oxide; thirdly, tracking and measuring the pH value of a solution, and taking out calcium oxide when the pH value of the solution reaches 10; and finally, filtering the solution, washing and drying the solid obtained by filtering to obtain superfine calcium carbonate, and evaporating to crystallize the filtered solution to obtain ammonium chloride crystals. The method disclosed by the invention has the following beneficial effects that: 1, the prepared calcium carbonate reacts under a homogeneous condition, and the generated calcium carbonate is small in particle size and uniform in particle; 2, the product purity is high; 3, an ionic reaction is performed in a solution, the contact area is large, the time is short, and the preparation speed is high; 4, the reaction is performed at normal temperature and normal pressure, the production process is simple, and the cost is low; 5, the method is safe, environment-friendly and pollution-free; and 6, the energy consumption is low.

Description

technical field [0001] The invention relates to a preparation method of calcium carbonate, in particular to a method for rapidly preparing superfine calcium carbonate and co-producing ammonium chloride. Background technique [0002] The traditional preparation method of superfine calcium carbonate is mainly carbonization method. The specific steps are: first, the selected limestone (main component CaCO 3 ) is calcined to generate calcium oxide (CaO) and kiln gas (CO 2 ). Calcium oxide reacts with water to form calcium hydroxide (Ca(OH) 2 ). The generated calcium hydroxide is crushed under the action of high shear force, and the particles and impurities are removed by multi-stage hydrocyclone separation to obtain a refined calcium hydroxide suspension with a certain concentration. Then, pass CO 2 gas, add an appropriate amount of crystal form control agent, and carbonize to the end to obtain calcium carbonate slurry; finally, dehydrate, dry, and surface treat to obtain ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18C01C1/16
CPCC01C1/164C01F11/18
Inventor 邸万山
Owner LIAONING PETROCCHEM VOCATIONAL & TECH COLLEGE