一种适用于含钙固废浸取矿化生产高纯度纳米碳酸钙的复合叔胺盐浸取剂及其制备方法
By using a composite tertiary amine salt leaching agent, the problems of high chemical reagent loss and low selectivity in the leaching and mineralization of calcium-containing solid waste were solved, achieving efficient and low-cost calcium ion leaching and the preparation of high-purity nano-calcium carbonate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA UNIV OF MINING & TECH
- Filing Date
- 2024-03-21
- Publication Date
- 2026-07-17
AI Technical Summary
In existing calcium-containing solid waste leaching and mineralization technologies, chemical reagent consumption is high, costs are high, leaching selectivity is low, and amino acid leaching agents easily complex with metal ions, leading to a decrease in the purity of calcium enrichment solutions, while ammonium salt leaching agents easily cause ammonia escape and pollution.
A composite tertiary amine salt leaching agent is used, which consists of a main leaching agent and a dispersing agent. The main leaching agent is a compound of tertiary amine or organic reagent containing tertiary nitrogen atoms and acid. The dispersing agent is a compound of N-diethylhydroxylamine and acid. By absorbing and releasing protons, the pH is adjusted to improve leaching efficiency and selectivity, and calcium carbonate crystals are prevented from agglomerating during the mineralization stage.
It improves the leaching efficiency and selectivity of calcium ions, reduces leaching agent loss and cost, enhances the mineralization reaction rate, and produces calcium carbonate with high purity and small particle size, exhibiting good recycling performance and chemical stability.
Smart Images
Figure CN118207415B_ABST