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A platform for research: civil engineering, architecture and urbanism
Efficient and energy-saving arsenic sulfide slag cleaning treatment process
The invention discloses a high-efficiency and energy-saving arsenic sulfide slag cleaning treatment process which comprises the following steps: (1) carrying out size mixing on arsenic sulfide slag containing free acid and a reducing agent which is 3-6 times of the calculated amount, regulating the pH value of the size to 6.5 by using a regulator, and filtering and drying to obtain a dry material; (2) adding a framework material into the dry material, uniformly mixing, and making hollow bricks through a brick making machine; (3) transferring the hollow bricks into a furnace, and sequentially performing drying, reduction, sublimation and cooling to complete the arsenic removal process, so as to obtain arsenic-removed slag and arsenic-containing high-temperature flue gas; (4) cooling the arsenic-containing high-temperature flue gas through heat exchange by a heat exchanger, condensing in a condensing chamber, and recovering arsenic to obtain arsenic trioxide; and (5) the arsenic-removed tail gas is subjected to flue gas purification and water-gas separation and then is returned for use. By the adoption of the treatment process, external heat supply is basically not needed during continuous production, arsenic trioxide recycled through condensation is high in purity, arsenic-removed tail gas nitrogen is recycled after being purified, emission is basically avoided, or the emission amount is small, and environment friendliness is achieved.
本发明公开了一种高效节能的硫化砷渣清洁处理工艺，包括以下步骤：（1）将含有游离酸的硫化砷渣与计算量3~6倍的还原剂调浆，用调节剂调节浆液的pH值为6.5，过滤烘干得到干料；（2）在干料中加入骨架料，混合均匀后经制砖机制成空心砖；（3）将空心砖转入炉中依次进行烘干、还原、升华和冷却完成脱砷过程，得到脱砷渣和含砷高温烟气；（4）含砷高温烟气经换热器换热降温后进入冷凝室冷凝回收砷得到三氧化二砷；（5）脱砷尾气经烟气净化和水气分离后返回使用。本发明采用上述的处理工艺，连续生产时基本无需外部供热，冷凝回收的三氧化二砷纯度较高，脱砷尾气氮气净化后循环使用，基本上不外排或排放量很小，对环境友好。
Efficient and energy-saving arsenic sulfide slag cleaning treatment process
The invention discloses a high-efficiency and energy-saving arsenic sulfide slag cleaning treatment process which comprises the following steps: (1) carrying out size mixing on arsenic sulfide slag containing free acid and a reducing agent which is 3-6 times of the calculated amount, regulating the pH value of the size to 6.5 by using a regulator, and filtering and drying to obtain a dry material; (2) adding a framework material into the dry material, uniformly mixing, and making hollow bricks through a brick making machine; (3) transferring the hollow bricks into a furnace, and sequentially performing drying, reduction, sublimation and cooling to complete the arsenic removal process, so as to obtain arsenic-removed slag and arsenic-containing high-temperature flue gas; (4) cooling the arsenic-containing high-temperature flue gas through heat exchange by a heat exchanger, condensing in a condensing chamber, and recovering arsenic to obtain arsenic trioxide; and (5) the arsenic-removed tail gas is subjected to flue gas purification and water-gas separation and then is returned for use. By the adoption of the treatment process, external heat supply is basically not needed during continuous production, arsenic trioxide recycled through condensation is high in purity, arsenic-removed tail gas nitrogen is recycled after being purified, emission is basically avoided, or the emission amount is small, and environment friendliness is achieved.
本发明公开了一种高效节能的硫化砷渣清洁处理工艺，包括以下步骤：（1）将含有游离酸的硫化砷渣与计算量3~6倍的还原剂调浆，用调节剂调节浆液的pH值为6.5，过滤烘干得到干料；（2）在干料中加入骨架料，混合均匀后经制砖机制成空心砖；（3）将空心砖转入炉中依次进行烘干、还原、升华和冷却完成脱砷过程，得到脱砷渣和含砷高温烟气；（4）含砷高温烟气经换热器换热降温后进入冷凝室冷凝回收砷得到三氧化二砷；（5）脱砷尾气经烟气净化和水气分离后返回使用。本发明采用上述的处理工艺，连续生产时基本无需外部供热，冷凝回收的三氧化二砷纯度较高，脱砷尾气氮气净化后循环使用，基本上不外排或排放量很小，对环境友好。
Efficient and energy-saving arsenic sulfide slag cleaning treatment process
一种高效节能的硫化砷渣清洁处理工艺
YANG YUXIANG (author) / CHENG XI (author) / YE XUWU (author) / YU HAILIN (author)
2023-11-21
Patent
Electronic Resource
Chinese
IPC:
C01G
Verbindungen der von den Unterklassen C01D oder C01F nicht umfassten Metalle
,
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
/
B01D
SEPARATION
,
Trennen
/
B03C
Magnetische oder elektrostatische Trennung fester Stoffe von festen Stoffen oder flüssigen oder gasförmigen Medien
,
MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS
/
C04B
Kalk
,
LIME
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