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发明公开
CN104096707A 半干法脱硫灰资源化利用方法 有权 转让

半干法脱硫灰资源化利用方法
摘要：
本发明公开了一种半干法脱硫灰资源化利用方法，包括以下步骤：1)将半干法脱硫灰进行氧化，使其中的CaSO3充分转化成CaSO4；2)加水将所述氧化后的脱硫灰配成脱硫灰浆液，然后在脱硫灰浆液中充入CO2，使CO2与脱硫灰浆液中的Ca(OH)2充分反应生成CaCO3，其中，按CO2与Ca(OH)2的摩尔比为1.2～1.5：1的比例充入CO2；3)在步骤3)所得浆液中按NH4HCO3与钙的摩尔比为1.2～1.5：1的比例加入NH4HCO3，并调节pH为7～9，使含硫钙充分转化为碳酸钙沉淀；4)将步骤3)所得浆液制得氧化钙和硫酸铵固体。本发明方法充分利用了半干法脱硫灰中高钙高硫的特点，将脱硫灰转化为硫酸铵与碳酸钙，使得钙元素和硫元素的转化率分别达到95％以上，进而使得脱硫灰的资源化价值得以充分实现。
摘要（英）：

The invention discloses a resource utilization method of half-dry desulfurized fly ash. The resource utilization method comprises the following steps: (1) the half-dry desulfurized fly ash is oxidized to fully convert CaSO3 into CaSO4; (2) water is added to prepare the oxidized desulfurized fly ash to desulfurized fly ash slurry; and then, CO2 is filled in the desulfurized fly ash slurry, so that the CO2 is fully reacted with Ca(OH)2 in the desulfurized fly ash slurry to generate CaSO3, wherein the CO2 is filled by 1.2-1.5: 1 of the mol ratio of the CO2 to the Ca(OH)2; (3) NH4HCO3 is added by 1.2-1.5: 1 of the ratio of the NH4HCO3 to calcium in the obtained slurry, and the pH is adjusted within 7-9, so that sulfur-contained calcium is fully converted to calcium carbonate precipitate; and (4) the slurry obtained in the step (3) is prepared to a calcium oxide and ammonium sulfate solid. The method fully uses the characteristics of high calcium and high sulfur in the half-dry desulfurized fly ash to convert the desulfurized fly ash into ammonium sulfate and calcium carbonate, so that the conversion rates of a calcium element and a sulfur element respectively reach above 95%, and the resource value of the desulfurized fly ash is fully realized.

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