Method for preparing homogenous nano vaterite type calcium carbonate through limestone acidolysis

A limestone and nanosphere technology, applied in the direction of calcium carbonate/strontium/barium, etc., to achieve the effect of low energy consumption, avoiding waste of fossil fuel resources and reducing emissions

Active Publication Date: 2014-10-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on the preparation of homogeneous vaterite-type calcium carbonate by acidolysis carbonization without additives

Method used

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  • Method for preparing homogenous nano vaterite type calcium carbonate through limestone acidolysis
  • Method for preparing homogenous nano vaterite type calcium carbonate through limestone acidolysis
  • Method for preparing homogenous nano vaterite type calcium carbonate through limestone acidolysis

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1. Raw material pretreatment: crush and grind limestone ore into limestone powder with particle size less than 150μm;

[0029] 2. Acid hydrolysis of limestone: Weigh 50g of limestone powder and add it to 540mL of 2mol / L hydrochloric acid solution, acidolysis at room temperature with a stirring speed of 200r / min for 30min, and filter to obtain Ca 2+ , Mg 2+ , Fe 3+ , Fe 2+ and Cl - a solution of ions;

[0030] 3, impurity removal: get the solution 200mL that step 2 obtains, add the NaClO solution of 0.08g available chlorine content 6wt%; Add the ammoniacal liquor that concentration is 13.33mol / L after completion of reaction, adjust pH to be 8.5, obtain ferric hydroxide precipitation, static After standing for 45 minutes, remove the ferric hydroxide by suction filtration; continue to add ammonia water with a concentration of 13.33mol / L to adjust the pH to 10.9 to obtain magnesium hydroxide precipitate, and remove the magnesium hydroxide by suction filtration to obtain...

Embodiment 2

[0041] 1. Raw material pretreatment: crush and grind limestone ore into limestone powder with particle size less than 150μm;

[0042] 2. Acid hydrolysis of limestone: Weigh 25g of limestone powder and add it to 270mL of 2mol / L hydrochloric acid solution, acidolyze at room temperature at a stirring speed of 300r / min for 20min, filter after acidolysis to obtain 2+ , Mg 2+ , Fe 3+ , Fe 2+ and Cl - a solution of ions;

[0043] 3, impurity removal: get the solution 200mL that step 2 obtains, add the NaClO solution of 0.082g available chlorine content 4wt%; Add the ammoniacal liquor that concentration is 14.79mol / L after completion of reaction, adjust pH to be 9, obtain ferric hydroxide precipitation, static After standing for 45 minutes, remove the ferric hydroxide by suction filtration; continue to add ammonia water with a concentration of 14.79mol / L to adjust the pH to 11.2 to obtain magnesium hydroxide precipitate, and remove the magnesium hydroxide by suction filtration to ...

Embodiment 3

[0049] 1. Raw material pretreatment: crush and grind limestone ore into limestone powder with particle size less than 150μm;

[0050] 2. Acid hydrolysis of limestone: Weigh 25g of limestone powder and add it to 270mL of 2mol / L hydrochloric acid solution, acidolysis at room temperature with a stirring speed of 200r / min for 30min, and filter to obtain Ca 2+ , Mg 2+ , Fe 3+ , Fe 2+ and Cl - a solution of ions;

[0051] 3, impurity removal: get the solution 200mL that step 2 obtains, add the NaClO solution of 0.075g available chlorine content 10wt%; Add the ammoniacal liquor that concentration is 13.33mol / L after completion of reaction, adjust pH to be 8, obtain ferric hydroxide precipitation, static After standing for 60 minutes, remove the ferric hydroxide by suction filtration; continue to add ammonia water with a concentration of 13.33mol / L to adjust the pH to 10.8 to obtain magnesium hydroxide precipitate, and remove the magnesium hydroxide by suction filtration to obtain...

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Abstract

The invention discloses a method for preparing homogenous nano vaterite type calcium carbonate through limestone acidolysis, which comprises the following steps: crushing limestone, and pulverizing into powder; dissolving with hydrochloric acid, thus obtaining a solution containing main components CaCl2, MgCl2, FeCl2, FeCl3 and the like; adding NaClO to oxidize Fe<2+> into Fe<3+>; adding ammonia water to gradually regulate the pH value, and ensuring that the Fe<3+> and Mg<2+> in the solution are removed in the form of Fe(OH)3 and Mg(OH)2, thus obtaining a CaCl2-NH4Cl solution; and finally introducing CO2, reacting to form a CaCO3 precipitate, filtering, washing, and drying to obtain the high-purity homogenous nano vaterite type calcium carbonate. According to the invention, the homogenous calcium carbonate metastable state crystal form vaterite type can be prepared without adding any additive and crystal form control agent; and the prepared nano vaterite is self-assembled into a spherical particle, thus effectively inhibiting conversion of the vaterite to calcite and ensuring the stable crystal form. The acidolysis process disclosed by the invention is more friendly to environment, low in energy consumption, high in resource utilization rate and simple in method.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a method for preparing homogeneous nano-vaterite calcium carbonate by acid-decomposing limestone. Background technique [0002] The main component of limestone is calcium carbonate. It is widely used due to its wide natural distribution, easy acquisition and low price. China is one of the countries rich in limestone mineral resources in the world. According to statistics, the national limestone distribution area reaches 438,000 km 2 (excluding Tibet and Taiwan), the total reserves are 54.2 billion tons. If rationally developed and utilized, it will generate great value. [0003] At present, the most promising application of limestone is the production of nano-calcium carbonate with high added value, which is widely used in rubber, sealing adhesive materials, coatings, inks, papermaking and other industries. The existing methods for producing nano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 李歌李增和靳琳张欢
Owner BEIJING UNIV OF CHEM TECH
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