Regarding environment and comprehensive utilization of slag, fly ash remelt system of wet bottom boiler is positive.

液态排渣炉飞灰复熔系统对环保和炉渣综合利用等具有积极意义。

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Extracting aluminum oxide from fly ash and circulating waste gas, waste water and residue is a new process of comprehensive utilization of fly ash with high extra profit and low pollution.

从粉煤灰中提取氧化铝，并作废气、废液和废渣循环及利用，是一种粉煤灰高附加值、低污染的综合利用新工艺。

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Also the economic and social benefits of producing silicon fertilizer from fly ash and iron slag were discussed, which could offer a new way for the comprehensive utilization of cinder and iron slag.

最后评估了利用粉煤灰、炼铁炉渣开发硅肥的经济效益和社会效益，这将为粉煤灰、高炉渣综合利用开辟提供有价值的参考。

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