Method for preparing nano calcium carbonate

The preparation of nano-calcium carbonate by wet hydrolysis and liquid-liquid reaction solves the problems of ammonia escape and low CO2 utilization efficiency in dry carbide slag treatment, and realizes efficient and environmentally friendly preparation of nano-calcium carbonate, promoting resource utilization and carbon emission reduction.

CN122079216APending Publication Date: 2026-05-26XINJIANG UNIVERSITY
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Patent Information

Application Number
CN202610461777.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-09
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies for treating dry carbide slag suffer from ammonia escape problems, and the utilization efficiency of low-concentration flue gas CO2 is low, making it difficult to achieve synergistic recovery and comprehensive utilization of dry carbide slag and flue gas CO2. Furthermore, traditional methods result in resource waste and environmental pollution.

Method used

Dry carbide slag was pretreated by wet hydrolysis, and ammonium chloride was used as the leaching agent. A mixed solution of ammonium carbonate and ammonium bicarbonate was prepared by combining low-concentration flue gas CO2 and ammonia. Nano-calcium carbonate was prepared through liquid-liquid reaction, realizing the recycling of ammonium chloride and preventing ammonia escape.

Benefits of technology

It enables the recycling of ammonium chloride, efficiently converts low-concentration flue gas CO2, avoids ammonia escape, and greenly prepares high-purity nano-calcium carbonate, which has significant environmental and economic benefits, and promotes the resource utilization of dry carbide slag and industrial carbon emission reduction.

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Abstract

The invention provides a method for preparing nano calcium carbonate. The method comprises the following cyclic processes: (1) pretreating a dry carbide slag raw material; and (2) leaching Ca < 2 + > in the dry carbide slag by using an ammonium chloride solution, and carrying out solid-liquid separation to obtain a calcium chloride solution with relatively high purity and ammonia gas. (3) absorbing the ammonia gas obtained in the step (2) and the low-concentration CO2 flue gas to prepare a mixed solution of ammonium carbonate and ammonium bicarbonate; (4) mixing and reacting the ammonium carbonate and ammonium bicarbonate mixed solution obtained in the step (3) with the calcium chloride solution obtained in the step (2) to obtain calcium carbonate precipitate and an ammonium chloride solution; and (5) evaporating and concentrating the ammonium chloride solution obtained in the step (4), and returning to the step (2) to finish the whole circulation process. According to the method, escape ammonia generated by taking dry carbide slag through traditional CO2 leaching with ammonium chloride is used for absorbing flue gas to prepare ammonium carbonate and ammonium bicarbonate, efficient conversion of low-concentration flue gas CO2 is achieved, the conversion cost is remarkably reduced, the economic feasibility is improved, high-concentration ammonium carbonate of the converted product is used for producing and preparing nano CaCO3, and the yield of the nano CaCO3 is improved. And the method has remarkable environmental protection benefits and economic benefits.
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