Aiming to utilize CO₂ and solid waste form coal chemical industry synchronously, we proposed a novel process which integrated CO₂ mineral carbonation and utilization of gasification slags based on chemical looping. With NH₄Cl as the loop chemical, which generated HCl and NH₃ through pyrolysis, the aluminum, calcium, and so forth were extracted by HCl from the coal slag, and CO₂ was mineralized by calcium and NH₃. NH₄Cl was recovered after mineralization, and chemical looping was closed. A pilot setup with a capacity of 1-kg CO₂/h was conducted to demonstrate the feasibility of the chemical looping process. An airlift reactor was employed for mineral carbonation reaction, and conditions for extraction and mineral carbonation were optimized. The process presented the CO₂ conversion of more than 90% with a calcium overall utilization ratio of 74.8%. The CO₂ sequestration potential of the gasification slag is 121-g CO₂/kg slag, which is higher than that of steel slag and red mud. Calcium carbonate with the particle size of 1–10 μm can be obtained during the mineral carbonation. Simultaneously, the process extracted and enriched 62.3% of aluminum in the slag and enabled the deep utilization of the slag.

中文翻译：

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基于化学循环的煤气化炉渣利用CO2矿物碳化

针对煤化工中CO ₂与固体废弃物同步利用的问题，提出了一种基于化学循环的CO ₂矿物碳化与气化渣利用相结合的新工艺。以NH ₄ Cl为回路化学品，通过热解产生HCl和NH ₃，铝、钙等被HCl从煤渣中提取，CO ₂被钙和NH ₃矿化。矿化后回收NH ₄ Cl，封闭化学回路。容量为 1-kg CO _{2 的}试验装置/h 是为了证明化学循环过程的可行性。采用气升式反应器进行矿物碳化反应，优化了提取条件和矿物碳化条件。该工艺的CO ₂转化率超过90%，钙总利用率为74.8%。气化炉渣的CO ₂封存潜力为121-g CO ₂ /kg炉渣，高于钢渣和赤泥。在矿物碳酸化过程中可以获得粒径为1-10μm的碳酸钙。同时，该工艺提取并富集渣中62.3%的铝，实现了渣的深度利用。