Method for removing arsenic from solid material
A technology of solid materials and filtrate, applied in the direction of protection devices against harmful chemicals, etc., can solve the problem of ineffective recycling and other problems
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Embodiment 1
[0032] A method for removing arsenic in solid materials, comprising the following steps:
[0033] 1) Add arsenic-containing solid material into 0.3mol / L sodium hydroxide solution at a ratio of 1:6, and stir evenly.
[0034] 2) Chlorine gas is introduced.
[0035] 3) Heat up to 69°C, stir for 70 minutes, filter to obtain filter residue B and filtrate A
[0036] 4) Test the content of arsenic in the filter residue B, if not up to the standard, repeat the above steps 1)-3) until it reaches the standard.
[0037] 5) Add milk of lime to filtrate A, stir evenly, and filter to obtain filter residue C and filtrate D.
[0038] 6) The filter residue C is a solid material with high arsenic content; the arsenic content in the filtrate D is low, and contains an appropriate amount of alkali, which can replace the sodium hydroxide solution and return to step 1).
[0039] As a preferred manner, in step 2), chlorine gas is metered in at 0.2 times the total amount of arsenic, and 0.2 times i...
Embodiment 2
[0043] A method for removing arsenic in solid materials, comprising the following steps:
[0044] 7) Add the arsenic-containing solid material into the 0.5 mol / L sodium hydroxide solution at a ratio of 1:9, and stir evenly.
[0045] 8) Chlorine gas is introduced.
[0046] 9) Heat up to 80°C, stir for 80 minutes, filter to obtain filter residue B and filtrate A
[0047] 10) Test the content of arsenic in the filter residue B, if it does not meet the standard, repeat the above steps 1)-3) until it reaches the standard.
[0048] 11) Add milk of lime to filtrate A, stir evenly, and filter to obtain filter residue C and filtrate D.
[0049] 12) The filter residue C is a solid material with high arsenic content; the arsenic content in the filtrate D is low, and contains an appropriate amount of alkali, which can replace the sodium hydroxide solution and return to step 1).
[0050] As a preferred manner, in step 2), chlorine gas is metered in at 0.23 times the total amount of arse...
Embodiment 3
[0054] A method for removing arsenic in solid materials, comprising the following steps:
[0055] 1) Add arsenic-containing solid material into 0.3mol / L sodium hydroxide solution at a ratio of 1:7, and stir evenly.
[0056] 2) Pass into hypochlorite.
[0057] 3) Heat up to 70°C, stir for 80 minutes, filter to obtain filter residue B and filtrate A
[0058] 4) Test the content of arsenic in the filter residue B, if not up to the standard, repeat the above steps 1)-3) until it reaches the standard.
[0059] 5) Add milk of lime to filtrate A, stir evenly, and filter to obtain filter residue C and filtrate D.
[0060] 6) The filter residue C is a solid material with high arsenic content; the arsenic content in the filtrate D is low, and contains an appropriate amount of alkali, which can replace the sodium hydroxide solution and return to step 1).
[0061] As a preferred mode, in step 2), hypochlorite is added twice as much as the total amount of arsenic, and hypochlorite inclu...
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