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Method for preparing nanometer calcium carbonate from calcium-containing solid waste residues and waste acid

A technology of nano-calcium carbonate and solid waste residues, applied in the fields of calcium carbonate/strontium/barium, chemical instruments and methods, nanotechnology for materials and surface science, etc. and other problems, to achieve the effect of low cost, high economic benefit and simple process

Active Publication Date: 2021-03-30
HENAN UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention proposes a method for preparing nano-calcium carbonate from calcium-containing solid waste residue and waste acid, which solves the current problem of effective treatment of industrial waste acid and calcium-containing solid waste residue, and effectively combines the two

Method used

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  • Method for preparing nanometer calcium carbonate from calcium-containing solid waste residues and waste acid
  • Method for preparing nanometer calcium carbonate from calcium-containing solid waste residues and waste acid
  • Method for preparing nanometer calcium carbonate from calcium-containing solid waste residues and waste acid

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Effect test

Embodiment 1

[0033] The method for preparing nano-calcium carbonate by using calcium-containing solid waste residue and waste acid, the steps are as follows:

[0034] Weigh 1000g of calcium-containing solid waste residue (200 mesh), slowly add it to 25wt% waste hydrochloric acid with vigorous stirring, and when the pH ≈ 6.5, filter the insoluble matter and send it to make cement, and then add water to the solution to adjust the Ca 2+ The concentration is 0.1mol / L. Take 200 mL of the above 0.1 mol / L Ca salt solution, add 6 mL of 25 wt % concentrated ammonia water to adjust the pH to 9. Add 2 mL of ethylene glycol, and then at 20 °C, pass in CO at a rate of 60 mL / min 2 Gas for 45 minutes, after the reaction, undergo solid-liquid separation to obtain nanometer calcium carbonate solid and ammonium chloride solution. Calcium carbonate solid was dried at 110°C to be 1.97g, and the measured purity was 96%. After the filtrate was adjusted to neutral with dilute hydrochloric acid, it was dried a...

Embodiment 2

[0036] The method for preparing nano-calcium carbonate by using calcium-containing solid waste residue and waste acid, the steps are as follows:

[0037] Weigh 1000g of calcium-containing solid waste residue (200 mesh), slowly add it to 25wt% waste nitric acid with vigorous stirring, and when the pH ≈ 7.5, filter the insoluble matter and send it to make cement, and then add water to the solution to adjust the Ca 2+ The concentration is 0.1mol / L. Take 200 mL of the above 0.1 mol / L Ca salt solution, add 6 mL of 25 wt % concentrated ammonia water to adjust the pH to 8. Add 2 mL of ethylene glycol, then at 60 °C, pass CO at a rate of 300 mL / min 2 Gas for 15 minutes, after the reaction, undergo solid-liquid separation to obtain nano-calcium carbonate solid and ammonium nitrate solution. Calcium carbonate solid was dried at 110°C to obtain 2.04g, and the measured purity was 94%. After the filtrate was adjusted to neutral with dilute nitric acid, it was dried at 105°C to obtain am...

Embodiment 3

[0039] The method for preparing nano-calcium carbonate by using calcium-containing solid waste residue and waste acid, the steps are as follows:

[0040] Weigh 1000g of calcium-containing solid waste residue (200 mesh), slowly add it to 25wt% waste sulfuric acid with vigorous stirring, and when the pH ≈ 6.5, filter the insoluble matter to obtain calcium sulfate solid ( figure 2 ), and the remaining wastewater will continue to be used for acidification and neutralization. Take 100 g of the above-mentioned calcium sulfate solid and place it in 200 mL of water, add 6 mL of 25 wt % concentrated ammonia water to adjust the pH to 8. Add 2 mL of structural regulator ethylene glycol, and then at 40 °C, pass CO at a rate of 150 mL / min. 2 Gas for 25 minutes, after the reaction, through solid-liquid separation, to obtain calcite-type nano-calcium carbonate solid ( image 3 ) and ammonium sulfate solution. Calcium carbonate solid was dried at 110°C to be 1.98g, and the measured purity...

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Abstract

The invention provides a method for preparing nanometer calcium carbonate from calcium-containing solid waste residues and waste acid. The method comprises the following steps: (1) mixing calcium-containing solid waste residues or heavy calcium carbonate with waste acid, conducting violent stirring, and performing filtering to obtain a calcium-containing solution or a calcium salt precipitate; and(2) regulating the pH value of the calcium-containing solution or the calcium salt precipitate, introducing CO2 gas, adding a structure regulator for carbonization treatment, and performing filteringto obtain the nanometer calcium carbonate. According to the invention, high-added-value nanometer calcium carbonate and ammonium salt with a purity higher than 94% and a water content lower than 0.5%are generated, and residual water with a pH of approximately 7 is recycled for continuous acidification and neutralization treatment. According to the invention, organic combination treatment and application of industrial calcium-containing solid waste residues and waste dilute acid are effectively achieved; heavy calcium carbonate can also be independently added to treat industrial waste, namelydilute acid; and finally, the high-added-value nanometer calcium carbonate and an industrial-grade chemically-pure ammonium salt fertilizer are generated, so both economic benefits and environmentalprotection benefits are achieved, and good development prospects and application and popularization values are realized.

Description

technical field [0001] The invention relates to the field of inorganic chemical industry, in particular to a method for preparing nano calcium carbonate from calcium-containing solid waste residue and waste acid. Background technique [0002] Sulfuric acid is known as the "mother of the chemical industry" and has been used as a symbol to measure the level of a country's chemical industry (the production capacity of sulfuric acid is 142 million tons in 2020). It is widely used in fertilizers, titanium dioxide, petrochemicals, dyes, and pharmaceuticals , pesticides and other industries play an important role in national production. With the continuous growth of sulfuric acid consumption, the amount of domestic industrial waste sulfuric acid is also increasing year by year. Waste sulfuric acid is produced in the production process of fine chemical products such as nitration, sulfonation, alkylation, esterification of organic matter, and also in mineral processing, petroleum re...

Claims

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Application Information

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IPC IPC(8): C01F11/18B82Y30/00C04B7/14C04B7/24C05C1/00C05C3/00
CPCC01F11/18C01F11/183B82Y30/00C05C1/00C05C3/00C04B7/14C04B7/24Y02P40/10
Inventor 蒲彦锋李磊李枫霍琳梦王甜李建明李辰鑫乔聪震杨浩柏
Owner HENAN UNIVERSITY
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