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Method for preparing high purity aragonite type nano calcium carbonate by acidolysis of limestones

A nano-calcium carbonate and limestone technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc., can solve the problems of difficulty in industrialization, high cost, large consumption, etc., and solve the problem of low utilization rate of ore resources and low cost Low, high yield effect

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

AI Technical Summary

Benefits of technology

This patented technology involves directly dissolving limestone with strong acids like hydrochloric or sulfuric acid at very lower temperatures than traditional methods for producing calcite (CaCO3). By doing this, it saves on heating costs while reducing environmental impact by preventing ash from being released into air when burning fossil fuels. Additionally, there are technical benefits that make these processes simpler but more efficient compared to other existing techniques such as pyrolysis.

Problems solved by technology

This patented describes methods for producing various types of materials called calcium carbons (CaC), including ceramics like porcelain fiber). However, these techniques require expensive equipment that can generate harmful waste due to their production processes involving burning fossil fuels. Additionally, current methods involve complicated steps leading to poor reproduction rates and uncontrollability over different grades of calciurnina produced by varying compositions and concentrations.

Method used

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  • Method for preparing high purity aragonite type nano calcium carbonate by acidolysis of limestones
  • Method for preparing high purity aragonite type nano calcium carbonate by acidolysis of limestones
  • Method for preparing high purity aragonite type nano calcium carbonate by acidolysis of limestones

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Embodiment 1

[0029] 1) Grind the limestone ore into a powder about 40μm;

[0030] 2) Add 50g of limestone powder obtained in step 1) to 540mL of 2mol / L hydrochloric acid solution, stir and react at room temperature for 30min, and filter;

[0031] 3) Take 100 mL of the filtrate obtained in step 2) and add 0.04 g of NaClO solution with an available chlorine content of 6 wt%; after the reaction is completed, add 12 mol / L ammonia water, adjust the pH to 6, and obtain iron hydroxide precipitation. After standing for 45 minutes Suction filtration to remove ferric hydroxide; continue to add 12mol / L ammonia water to adjust the pH to 11.00, and let stand for 30 minutes to obtain magnesium hydroxide precipitation, suction filtration to remove magnesium hydroxide to obtain CaCl 2 -NH 4 Cl solution;

[0032] 4) The CaCl obtained in step 3) 2 -NH 4 The Cl solution and the sodium carbonate solution are added into the reaction vessel at the same time in a volume ratio of 1:1. The concentration of the sodium car...

Embodiment 2

[0034] 1) Grind the limestone ore into a powder about 40μm;

[0035] 2) Add 50 g of the limestone powder obtained in step 1) to 720 mL of 1.5 mol / L hydrochloric acid solution, stir and react for 30 min at room temperature, and filter;

[0036] 3) Take 100 mL of the filtrate obtained in step 2) and add 0.05 g of NaClO solution with an effective chlorine content of 6 wt%; after the reaction is completed, add 12 mol / L ammonia water, adjust the pH to 5, and obtain iron hydroxide precipitation. After standing for 45 minutes Suction filtration to remove ferric hydroxide; continue to add 12mol / L ammonia water to adjust the pH to 11.00, and let stand for 30 minutes to obtain magnesium hydroxide precipitation, suction filtration to remove magnesium hydroxide to obtain CaCl 2 -NH 4 Cl solution;

[0037] 4) The CaCl obtained in step 3) 2 -NH 4 The Cl solution is diluted or concentrated to make the concentration of calcium chloride 0.115mol / L, 0.23mol / L, 0.46mol / L, 0.92mol / L, 1.84mol / L, and then...

Embodiment 3

[0039] 1) Grind the limestone ore into a powder about 40μm;

[0040] 2) Add 50g of limestone powder obtained in step 1) to 540mL of 2mol / L hydrochloric acid solution, stir and react at room temperature for 30min, and filter;

[0041] 3) Take 100 mL of the filtrate obtained in step 2) and add 0.04 g of NaClO solution with an available chlorine content of 6 wt%; after the reaction is completed, add 12 mol / L ammonia water and adjust the pH to 5 to obtain iron hydroxide precipitation. After standing for 45 minutes Suction filtration to remove ferric hydroxide; continue to add 12mol / L ammonia water to adjust the pH to 11.00, let stand for 30 minutes to obtain magnesium hydroxide precipitation, suction filtration to remove magnesium hydroxide to obtain CaCl 2 -NH 4 Cl solution;

[0042] 4) The CaCl obtained in step 3) 2 -NH 4 Dilute the Cl solution to a concentration of 0.46mol / L, prepare a sodium carbonate solution of the same concentration and the same molar amount, and then add it to th...

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Abstract

The invention discloses a method for preparing high purity aragonite type nano calcium carbonate by acidolysis of limestones and belongs to the technical field of preparation of nanomaterials. The method comprises the following steps: by using an abundant mineral resource limestones in nature as raw materials, directly acid leaching without adding any additive; and carrying out a replacement reaction on the acid-leached CaCl2-NH4Cl filtrate and a sodium carbonate solution to obtain the high purity aragonite type nano calcium carbonate. The method disclosed by the invention avoids high temperature sintering, can save the energy consumption, reduce dust pollution generated by combustion of coal and solve the problem that the utilization ratio of the mineral resource is low, and can realize clean and environment-friendly production. The method disclosed by the invention is simple to operate and low in cost and the prepared aragonite type nano calcium carbonate is high in yield and purity and easy to realize industrialized production.

Description

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Claims

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Application Information

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Owner BEIJING UNIV OF CHEM TECH
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