Sulfuration recovery processing method and device for high-acidity high-arsenic high-cadmium waste water

Sulfuration recovery processing method and device for high-acidity high-arsenic high-cadmium waste water

  • CN 101,234,826 A
  • Filed: 08/29/2007
  • Published: 08/06/2008
  • Est. Priority Date: 08/29/2007
  • Status: Active Application
First Claim
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1. high-acidity high-arsenic high-cadmium waste water sulfuration recovery processing method is characterized in that adopting following steps:

  • Remove the SO in the waste water earlier 2, Analyze the acidity of waste water and remaining SO2, As, Cu, Cd and Sb, the content of Sn, Pb, and according to remaining SO 2, As, Cu, Cd and Sb, Sn, the cubage sodium sulphite of Pb or the theoretical add-on of other vulcanizing agents, actual add-on is generally 105~

    110% of theoretical amount, add the fashionable sulfuric acid that should consume or other acid amounts according to what the actual add-on of sodium sulphite or other vulcanizing agents was calculated sodium sulphite or other vulcanizing agents, the sulfuric acid that deduction should consume or other acid amounts are determined the add-on of lime, settle the standard and be, when vulcanization reaction finished, waste water acidity was counted 15g/L 〉

    =H with sulfuric acid 2SO 4G/L 〉

    =0.5g/L, True quantitative lime and desulfurization wastewater are added fully stirring in the lime neutralizing well, and centrifugal or cripling separates, and reclaims gypsum,Separating filtrate enters the uniform reaction unit of immersion bull from opening for feed (7), turn on agitator (2), vulcanizing agent enters medicament distributing chamber (4) from feed-pipe (6), flow into uniform chemical feed pipe (9) again, flow out with given pace from a plurality of dosings hole (10) of uniform chemical feed pipe (9) bottom, the uniform dispersion of vulcanizing agent joins in the filtrate, the As under fully stirring in the filtrate 3+Reaction generates As 2S 3, Cd 2+Reaction generates CdS, separates, and reclaims As 2S 3, CdS and other metallic sulfides the sulfuration slag, micro-H 2S gas is discharged from venting port (8), The filtrate of removing slag is introduced in the lime and in the sudden and violent air drain, is added and H 2SO 4The milk of lime of reaction aequum, neutralization and sudden and violent gas are adjusted about pH to 8.5, separate, and reclaim gypsum, the treated water qualified discharge.

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