Ọgwụgwọ nke mmiri mkpofu nwere chromium na electroplating

Ntụnyere mmetụta ọgwụgwọ nke ferrous sulfate na sodium bisulfite

Usoro mmepụta electroplating kwesịrị ịbụ nke a na-akpọ galvanized, ma n'usoro nhicha galvanized, ihe bụ isi nke ụlọ ọrụ electroplating ga-eji chromate, yabụ mmiri mkpofu electroplating ga-emepụta ọtụtụ mmiri mkpofu nwere chromium n'ihi chromium plating. Chromium dị na mmiri mkpofu nwere chromium nwere hexavalent chromium, nke na-egbu egbu ma sie ike iwepụ. A na-agbanwekarị chromium hexavalent ka ọ bụrụ trivalent chromium ma wepụ ya. Maka iwepụ mmiri mkpofu nwere chrome, a na-ejikarị coagulation kemịkalụ na mmiri ozuzo ewepụ ya. A na-ejikarị usoro ferrous sulfate na lime reduction precipitation na sodium bisulfite na alkali reduction precipiation.

1. usoro mbelata mmiri ozuzo ferrous sulfate na lime

Ferrous sulfate bụ ihe na-eme ka acid coagulant sie ike ma nwee ike ibelata oxidation. Enwere ike ibelata Ferrous sulfate ozugbo site na iji hexavalent chromium mgbe hydrolysis gasịrị na mmiri mkpofu, na-agbanwe ya ka ọ bụrụ akụkụ nke trivalent chromium coagulation na mmiri ozuzo, wee tinye lime iji gbanwee uru pH ka ọ bụrụ ihe dịka 8~9, ka o wee nwee ike inyere mmeghachi omume coagulation aka ịmepụta mmiri ozuzo chromium hydroxide, mmetụta mwepụ nke chromate nwere ike iru ihe dịka 94%.

Mbelata mmiri ozuzo nke ferrous sulfate tinyere lime coagulant na-enwe mmetụta dị mma na mwepụ chromium na ọnụ ahịa dị ala. Nke abụọ, ọ dịghị mkpa ịgbanwe uru pH tupu etinye ferrous sulfate, naanị ihe dị mkpa bụ itinye lime iji gbanwee uru pH. Agbanyeghị, n'ihi nnukwu ọnụọgụ nke ọgwụ ferrous sulfate kpatara mmụba dị ukwuu na apịtị ígwè, na-eme ka ọnụ ahịa ọgwụgwọ sludge dịkwuo elu.

2,.sodium bisulfite na usoro mbelata mmiri ozuzo

N'ime mmiri mmiri sodium bisulfite na alkali, a na-agbanwe pH nke mmiri mmiri ahụ ka ọ bụrụ ≤2.0. Mgbe ahụ, a na-agbakwunye sodium bisulfite iji belata chromium ka ọ bụrụ trivalent chromium, mmiri mmiri ahụ na-abanyekwa n'ọdọ mmiri zuru oke mgbe emechara mbelata ahụ, a na-apịpụ mmiri mmiri ahụ na ọdọ mmiri na-achịkwa maka mgbanwe, a na-agbanwekwa uru pH ahụ ka ọ bụrụ ihe dị ka 10 site na itinye alkali nodes, wee wụpụ mmiri mmiri ahụ na tankị sedimentation iji mee ka chromate pụta ìhè, ọnụego mwepụ ahụ nwekwara ike iru ihe dị ka 95%.

Usoro nke sodium bisulfite na alkali reduction precipitation chromate dị mma maka iwepụ chromium, ọnụ ahịa ya dịkwa elu karịa ferrous sulfate, oge mmeghachi omume ọgwụgwọ dịkwa ogologo, a ga-ejikwa acid gbanwee uru pH tupu ọgwụgwọ. Agbanyeghị, ma e jiri ya tụnyere ferrous sulfate, ọ naghị emepụta oke sludge, nke na-ebelata ọnụ ahịa ọgwụgwọ sludge nke ukwuu, a pụkwara iji sludge a gwọọ mee ihe ọzọ.