Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for improving cement solidified chromium slag and product thereof
The invention discloses a method for improving cement solidified chromium slag, which comprises the following steps: grinding and sieving chromium slag to obtain chromium slag powder; mixing an aceticacid aqueous solution with the chromium slag powder, and stirring to obtain chromium slag acid slurry; mixing sodium peroxydisulfate into the chromium slag acid slurry, and stirring until the sodiumperoxydisulfate is completely dissolved to obtain sulfur-doped chromium slag acid slurry; weighing aluminum ash and calcium oxide, and mixing to obtain externally added mixed powder; and respectivelyweighing the sulfur-doped chromium slag acid slurry, an externally added mixed powder and cement, mixing, uniformly stirring, putting an obtained mixture into a mold, and curing to obtain a chromium slag cement solidified body. The invention further discloses the chromium slag cement solidified body. By means of the method, reduction detoxification of chromium in the acid-leached state in the chromium slag can be achieved, and the chromium slag can be fully wrapped by generating ettringite, calcium acetate and chromium hydroxide to strengthen the hydrated calcium silicate hardening process. The uniaxial compressive strength of the chromium slag cement solidified body prepared through the method is 67.35% higher than that of a traditional chromium slag cement solidified body, and the leaching toxicity of hexavalent chromium is lower than that of the domestic waste landfill pollution control standard (GB16889-2008).
本发明公开了一种改进水泥固化铬渣的方法，包括以下步骤：将铬渣研磨，过筛，得铬渣粉末；将乙酸水溶液和铬渣粉末混合，搅拌得铬渣酸浆；将过二硫酸钠混入到铬渣酸浆中，搅拌至过二硫酸钠完全溶解，得硫掺铬渣酸浆；称取铝灰和氧化钙，混合，得外添加混合粉末；分别称取硫掺铬渣酸浆、外添加混合粉末和水泥，混合，搅拌均匀，入模，养护，得铬渣水泥固化体。本发明还公开了铬渣水泥固化体。本发明方法不仅可实现铬渣中酸可浸出态的铬还原解毒，还可通过生成钙矾石、乙酸钙和氢氧化铬强化水化硅酸钙硬化过程，实现对铬渣的充分包裹。本发明制备的铬渣水泥固化体的单轴抗压强度比传统铬渣水泥固化体强度最高高出67.35%，六价铬浸出毒性低于《生活垃圾填埋场污染控制标准》（GB16889‑2008）。
Method for improving cement solidified chromium slag and product thereof
The invention discloses a method for improving cement solidified chromium slag, which comprises the following steps: grinding and sieving chromium slag to obtain chromium slag powder; mixing an aceticacid aqueous solution with the chromium slag powder, and stirring to obtain chromium slag acid slurry; mixing sodium peroxydisulfate into the chromium slag acid slurry, and stirring until the sodiumperoxydisulfate is completely dissolved to obtain sulfur-doped chromium slag acid slurry; weighing aluminum ash and calcium oxide, and mixing to obtain externally added mixed powder; and respectivelyweighing the sulfur-doped chromium slag acid slurry, an externally added mixed powder and cement, mixing, uniformly stirring, putting an obtained mixture into a mold, and curing to obtain a chromium slag cement solidified body. The invention further discloses the chromium slag cement solidified body. By means of the method, reduction detoxification of chromium in the acid-leached state in the chromium slag can be achieved, and the chromium slag can be fully wrapped by generating ettringite, calcium acetate and chromium hydroxide to strengthen the hydrated calcium silicate hardening process. The uniaxial compressive strength of the chromium slag cement solidified body prepared through the method is 67.35% higher than that of a traditional chromium slag cement solidified body, and the leaching toxicity of hexavalent chromium is lower than that of the domestic waste landfill pollution control standard (GB16889-2008).
本发明公开了一种改进水泥固化铬渣的方法，包括以下步骤：将铬渣研磨，过筛，得铬渣粉末；将乙酸水溶液和铬渣粉末混合，搅拌得铬渣酸浆；将过二硫酸钠混入到铬渣酸浆中，搅拌至过二硫酸钠完全溶解，得硫掺铬渣酸浆；称取铝灰和氧化钙，混合，得外添加混合粉末；分别称取硫掺铬渣酸浆、外添加混合粉末和水泥，混合，搅拌均匀，入模，养护，得铬渣水泥固化体。本发明还公开了铬渣水泥固化体。本发明方法不仅可实现铬渣中酸可浸出态的铬还原解毒，还可通过生成钙矾石、乙酸钙和氢氧化铬强化水化硅酸钙硬化过程，实现对铬渣的充分包裹。本发明制备的铬渣水泥固化体的单轴抗压强度比传统铬渣水泥固化体强度最高高出67.35%，六价铬浸出毒性低于《生活垃圾填埋场污染控制标准》（GB16889‑2008）。
Method for improving cement solidified chromium slag and product thereof
一种改进水泥固化铬渣的方法及其产品
HUANG TAO (Autor:in) / ZHANG KE (Autor:in) / LIU WANHUI (Autor:in) / ZHANG SHUWEN (Autor:in) / SONG DONGPING (Autor:in) / JIN JUNXUN (Autor:in) / ZHOU LULU (Autor:in) / XU JIAOJIAO (Autor:in)
30.06.2020
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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