Process for treating cyaniding barren liquor by combining membrane separation with two-stage membrane electrodialysis
A technology of cyanide barren solution and double-stage membrane, which is applied in the fields of water/sewage multi-stage treatment, metallurgical wastewater treatment, water/sludge/sewage treatment, etc., can solve the problem of less treatment volume, and realize recycling, treatment Good effect and simple process
Inactive Publication Date: 2014-07-30
XIAMEN STARMEM TECH
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[0004] The purpose of the present invention is to aim at the deficiency of single treatment in the prior art, propose a kind of process of membrane separation combination two-stage membrane electrodialysis treatment cyanide barren solution, concentrate the barren solution through nanofiltration membrane, less processing capacity, improve concentration of metal ions
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[0020] Step 1: Take the cyanide barren solution and pass it through sand filtration, enter the secondary nanofiltration treatment system, the water production rate of the primary nanofiltration membrane is 70%, the water production rate of the secondary nanofiltration membrane is 90%, and the total water production rate is 63%; Dialysates and concentrates. The experimental operation data and experimental detection data are as follows:
[0021] Barren solution detection data Cu 2+ Fe 2+ SO 4 2- SCN - 1 7014.16 1410 31273.81 27071.99 2 7095.72 1770 33743.77 20864.14 3 7258.84 1920 33282.71 21378.03
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The invention discloses a process for treating cyaniding barren liquor by combining membrane separation with two-stage membrane electrodialysis. The process comprises the following steps: a step 1, roughly filtering the cyaniding barren liquor, carrying out nanofiltration separation to obtain nanofiltration dialysate and nanofiltration concentrated liquor, and recycling the nanofiltration dialysate to a cyaniding process; a step 2, adding a calcium remover into the nanofiltration concentrated liquor, and carrying out plate-frame pressure filtration after stirring to obtain plate-frame pressure filtrate; a step 3, adding ammonia water into the plate-frame pressure filtrate to desorb heavy metal complex, conveying the desorbed liquor to two-stage membrane electrodialysis to respectively obtain sodium hydroxide liquor, sodium cyanide liquor, and miscellaneous metal liquor, and recycling the sodium hydroxide liquor and the sodium cyanide liquor to the cyaniding process; a step 4, adding alkaline liquor into the miscellaneous metal liquor to precipitate, carrying out plate-frame pressure filtration and recycling the dialysate. The process for treating the cyaniding barren liquor by combining the membrane separation with two-stage membrane electrodialysis disclosed by the invention can effectively recycle active ingredients in the cyaniding barren liquor by membrane separation and two-stage membrane electrodialysis, so that water resource is recycled.
Description
technical field [0001] The invention relates to the field of metallurgical wastewater, in particular to a process for treating barren cyanide liquid by membrane separation combined with double-stage membrane electrodialysis. Background technique [0002] At present, most gold production enterprises use the cyanidation method to extract gold. The cyanide-containing barren solution produced by the cyanidation process has a large amount of treatment and is difficult to handle. It is the most important pollutant in gold refineries. Currently, most gold smelting uses a closed loop cycle of barren cyanide liquor. However, the continuous circulation of the poor liquid will cause the accumulation of various impurities, such as Cu, Zn, Pb, As, Sb, etc., which will cause the "fatigue" of the poor liquid and affect the leaching rate; the viscosity of the poor liquid will also increase, which will affect the washing rate; at the same time , the salt content of the lean liquid increases...
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IPC IPC(8): C02F9/06C02F103/16
Inventor 李振峰陈洪景孙洪贵
Owner XIAMEN STARMEM TECH