Sodium Formate Oxalic Acid Lam
Sodium formate phunglam in oxalic acid chuah khawhnak cu lead phunglam le calcium phunglam tiah tthen a si. Carbon monoxide cu sodium hydroxide cawhmi nih a lak i sodium formate a hmuh, cu cu ti a tlawmter i sodium oxalate a ser. A hnu bik nih cun lead sulfate (lead method) asiloah calcium hydroxide (calcium method) he aa pehtlaih i lead oxalate precipitate asiloah calcium oxalate precipitate a ser, cu cu sulfuric acid he acid a tuah i oxalic acid a hmuh.
Oxalic acid chuah khawhnak ding caah lead method: Tawl hnu, alkali tawl hnu le leidip hlonh hnu ah, carbon monoxide cu compressor in 2 MPa tiang an hmeh, 160 g/L sodium hydroxide he 150 °C tiang an lumter, cun a tlawmmi sodium formate cawhnuk sernak caah reactor ah an kuat. Cu cawhmi cu 600 g/L hrawng ah an cawh, ti chuahnak kettle ah an kuat i lumter i a fekmi ah an cawh, cun an lumter i an cawh, cun 400 °C ah ti an cawh. Dehydrogenated sodium oxalate cu thlennak ah timhtuah a si, cun lead sulfate cu pH man 3-4 ah chiah in cawh in cawh a si. A cawh khomi thil thurhnawm pawl cu tawlnak in an hloh hna, cun a tam deuhmi sulphuric acid cu acid tuahnak caah oxalic acid cawhmi hmuh khawhnak ding caah an cawh. Barium carbonate le 1% polyacrylamide cu thurhnawmhnak hloh khawhnak ding caah coagulation le sedimentation caah an cawh. A cawhmi cu a lumter, a lumter, centrifugation in a thlet, cun a dihmi thilri hmuh khawhnak ding caah a roter.
Oxalic acid chuah khawhnak ding caah calcium lam: Timhtuahnak sodium oxalate thlennak le calcium hydroxide thlennak cu zat an tuak i calciumization thlennak caah calciumization reactor ah an kuat hna. Hmuhchuahmi calciumization ti cu thlet a si i tawl a si. Filter sodium hydroxide cu a tlawm i sodium formate sernak caah hman a si, cun filter cake calcium oxalate cu acidification reaction caah hman a si. Filter cake cu calcium oxalate cawhmi ah an ser, cu cu sulfuric acid le a tlawmmi oxalic acid nu zu he acidification kettle ah an cawh, cun an cawh. Filter cake (gypsum) cu an tawl, cun tawlnak ti cu calcium oxalate thlennak caah hman a si. Filtrate (oxalic acid cawhmi) cu calcium sulfate tlawmpal tete chuah khawhnak dingah a hnim, a lumter, a tthawnter, cun a ttha lomi oxalic acid kha a thleidan khawhnak dingah a thlet, cu cu a ttha mi thilri hmuh khawhnak dingah a tthawnter tthan, a tthen i a roter, cun a nu zu cu hman tthan a si.
Sodium formate lead phunglam cu a puitlingmi thil kalning, a fekmi thilchuak tthatnak, le chuahnak caan tawite a ngei, 80%-90% chuah khawhnak le 99.5% thianhlimnak oxalic acid thianhlimnak he. Sihmanhsehlaw, thilchuah ningcang ah thir thurhnawmhnak a um, cun thlennak in hmuhmi sodium sulfate cu thilchuah ningcang ah kirter khawh a si lo caah thilchuahnak ah sulfuric acid le caustic soda tampi an hman. Oxalic acid sernak caah calcium phunglam nih vawlei tang ti ah lead chiti le sodium sulfate thurhnawmhnak kha a hloh khawh, cun caustic soda kha lime in thlennak nih thilchuah man kha tampi a zorter khawh. Cu thil cangmi in hmuhmi CaSO4 cu thurhnawmhnak um loin inn saknak thilri ah ser khawh a si. Cu lio caan te ah cun, thlennak in hmuhmi nu zu NaOH cu CO he pehtlaihnak tuahnak ah hman a si i sodium formate sernak caah hman a si, cucaah thilri hmanmi zat kha a khamh.

Shandong Pulisi Chemical Oxalic Acid: A tthatnak bik
Shandong Pulisi Chemical's oxalic acid (≥99.6% thianhlimnak, CAS 144-62-7) cu a tlawm tukmi thurhnawmhnak (sulfate ≤0.1%, thir rit ≤0.002%, thir ≤0.003%) le ISO 900 BV, REMI, FA-SQ, certifications he a lang vawleicung chawlehnak caah zulhphung zulh khawhnak hnga tuah. Kum 18+ chung chemical thiamnak in dirhmi, sehzung-direct man, Qingdao, Tianjin, Shanghai tilawng dinhnak hmun kip ah thil chiahnak inn he container tling thilri phorhnak, le Shandong Pulisi Chemical Group ttha tein kuat khawhnak ding caah duhning in sermi thilri chiahnak (25kg/50kg) kan pek hna. Kan oxalic acid cu a tlawmmi thir thletnak, thir vutcam hlohnak, thilpuan rong suainak le marble hnawmhnak ah a thiam, vawleicung pumpi ah riantuannak a ngeimi hna caah a hmunmi, a rawk khomi thil a chuahter.