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Method for preparing nano calcium carbonate by in-situ electrochemical precipitation technology

A nano-calcium carbonate, in-situ electrochemical technology, applied in chemical instruments and methods, calcium carbonate/strontium/barium, inorganic chemistry, etc., to achieve the effect of reducing production costs and efficient comprehensive utilization

Pending Publication Date: 2020-09-29
GUANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, Hezhou City has invested hundreds of millions of yuan in the establishment of waste discharge areas, which has curbed the current situation of random dumping to a certain extent, but has not fundamentally solved the problem of marble waste utilization. How to solve the problem of marble and calcium-based waste resources Utilizing and realizing high-value applications has become an urgent need and focus of attention in the industry

Method used

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  • Method for preparing nano calcium carbonate by in-situ electrochemical precipitation technology
  • Method for preparing nano calcium carbonate by in-situ electrochemical precipitation technology
  • Method for preparing nano calcium carbonate by in-situ electrochemical precipitation technology

Examples

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Effect test

Embodiment 1

[0047] A method for preparing nano-calcium carbonate by in-situ electrochemical precipitation technology, using calcium chloride solution with a concentration of 2.2mol / L as raw material, using a micro-electrolysis system of JM10 cation exchange membrane for electrolysis and calcium ion migration, and controlling the current of the cathode The density is 15A / m 2 Within the range, calcium ions are moved to the cathode chamber, enriched in the form of calcium hydroxide solution, and then citric acid (1% mass concentration percentage) and dispersant ethanol-water solution (ethanol: water=3:1), and with pure CO 2 Carry out the carbonization reaction with the gas, control the reaction temperature at 30°C, carry out the carbonization reaction in a stirred carbonization kettle for 70 minutes, the stirring speed is 700 rpm, and age for 2 hours after the reaction is completed to form nano-calcium carbonate, and the product is obtained by separation and vacuum drying; The CO 2 The gas...

Embodiment 2

[0049] A method for preparing nano-calcium carbonate by in-situ electrochemical precipitation technology, using calcium chloride solution with a concentration of 6mol / L as raw material, using a micro-electrolysis system of JM10 cation exchange membrane for electrolysis and calcium ion migration, and controlling the current density of the cathode 15A / m 2 Within the range, calcium ions are moved to the cathode chamber, enriched in the form of calcium hydroxide solution, and then stearate (0.8% mass concentration percentage) and dispersant propanol-water solution are added to the calcium hydroxide enriched solution in the cathode chamber (propanol: water=2:8), and feed pure CO at a speed of 1000ml / min 2 Carry out the carbonization reaction with the gas, control the reaction temperature at 15°C, carry out the carbonization reaction in a stirred carbonization kettle for 60 minutes, and the stirring speed is 650 rpm, after the reaction is completed, age for 1.5 hours to form nano-ca...

Embodiment 3

[0051] A method for preparing nano-calcium carbonate by in-situ electrochemical precipitation technology, using calcium chloride solution with a concentration of 6mol / L as raw material, using a micro-electrolysis system of JM10 cation exchange membrane for electrolysis and calcium ion migration, and controlling the current density of the cathode 15A / m 2 Within the range, calcium ions are moved to the cathode chamber, enriched in the form of calcium hydroxide solution, and then oleate (0.9% mass concentration percentage) and dispersant tert-butanol-water solution are added to the calcium hydroxide enriched solution in the cathode chamber (tert-butanol: water=4:1), and feed pure CO at a speed of 500ml / min 2 The carbonization reaction is carried out with the gas, the reaction temperature is controlled at 20°C, the carbonization reaction is carried out in a stirred carbonization kettle for 70 minutes, the stirring speed is 660 rpm, after the reaction is completed, it is aged for 1...

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Abstract

The invention provides a method for preparing nano calcium carbonate by an in-situ electrochemical precipitation technology. A calcium chloride solution is adopted as raw material, a micro-electrolysis system is used for carrying out an electrolytic reaction; high-purity calcium hydroxide suspension is obtained in a cathode chamber by utilizing selective calcium ion migration of a cation exchangemembrane; by taking CO2-containing gas as a carbonizing agent and under the synergistic effect of a crystal form control agent and a dispersing agent, the calcium hydroxide suspension is carbonized and crystallized to form stable nano calcium carbonate particles; and separation and drying are then performed to obtain a nano calcium carbonate finished product. Chlorine formed in the anode chamber is circulated back to the upstream wet extraction process to be utilized, and hydrogen generated in the cathode chamber escapes, is collected and purified to obtain high-purity hydrogen. The method solves the recycling problem of mine tailings or marble leftover materials, is an important means for realizing 'heavy calcium carbonate recovery-calcium purification-nano calcium carbonate preparation',does not need high-temperature calcination, realizes ecological internal circulation by utilizing clean energy and CO2, and is a method for efficiently and cleanly producing a nano-scale powder material.

Description

technical field [0001] The invention is applied in technical fields such as nanoscale powder processing, electrodialysis, electrolytic hydrogen production, etc., and is used for preparing nanometer calcium carbonate and producing hydrogen. Background technique [0002] The calcium carbonate industry still faces many factors that restrict the development of the industry, mainly in the small overall scale of the enterprise, serious resource destruction and waste; single product structure, mainly low-end calcium carbonate products, and a low proportion of high value-added products. The economic benefits are not high; the calcium carbonate industry chain is not extended enough and the scale is limited, which is not enough to form support for the entire calcium carbonate new material industry chain, which needs to be improved and improved urgently. Nano calcium carbonate is an important supplement to extend the calcium carbonate industry chain, and the development and development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00C25B1/18C25B1/26C25B1/10
CPCC01F11/183B82Y40/00C25B1/18C25B1/26C01P2002/72C01P2004/03C01P2004/04C01P2004/64C01P2004/16Y02P20/141
Inventor 黄慨黄绍权周欢顾传君黄志民冼学权黄华林师德强
Owner GUANGXI ACAD OF SCI
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