发明名称 |
WERKWIJZE VOOR DE EINDZUIVERING VAN FLUOR BEVATTENDE AFVALGASSEN. |
摘要 |
<p>Exhaust gases contg. F are finally purified by scrubbing with an alkaline absorbent, esp. NaOH- or KOH- soln. to obtain crystalline prods. contg. F2. A single process circuit is used for both scrubbing and crystallisation with a single scrubber soln. and the supernatant liq. remaining after crystallisation is completely returned to the scrubbing tower. From the tower, the liq. travels through an intermediate cooler to a crystallising vessel, and/or fresh NaOH or KOH soln. is added to the liq. before crystallisation so a constant pH is maintained in the alkaline region. Fresh water is pref. added continuously to the upper part of the scrubbing tower to saturate the gas and also undertake a final cleaning operation. The waste gas entering the environment after treatment. contains less than 1 mg F2/m3 of gas; and no waste water is generated in the process. The fluoride crystals obtd. are commercially useful.</p> |
申请公布号 |
NL7708551(A) |
申请公布日期 |
1978.02.21 |
申请号 |
NL19770008551 |
申请日期 |
1977.08.02 |
申请人 |
VEB EMAILSCHMELZE RADEBERG TE RADEBERG, DUITSE DEM. REP. |
发明人 |
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分类号 |
B01D53/14;B01D53/68;B01D59/26;C01B;C01D3/02;(IPC1-7):01D53/14;01D53/34 |
主分类号 |
B01D53/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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