CN103951119A - Process for treating cyaniding barren liquor by combining membrane separation with two-stage membrane electrodialysis - Google Patents
Process for treating cyaniding barren liquor by combining membrane separation with two-stage membrane electrodialysis Download PDFInfo
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- CN103951119A CN103951119A CN201410158442.9A CN201410158442A CN103951119A CN 103951119 A CN103951119 A CN 103951119A CN 201410158442 A CN201410158442 A CN 201410158442A CN 103951119 A CN103951119 A CN 103951119A
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Abstract
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
The present invention relates to Metallurgical Waste Water field, particularly the technique of cyanide barren solution is processed in the EDBM of a kind of membrane sepn combination twin-stage.
Background technology
At present, most of gold manufacturing enterprise adopts extraction of gold by cyanidation, and it is large containing cyanogen lean solution treatment capacity that cyanidation technology produces, and intractability is high, is the topmost pollutent of gold refinery.Now, most gold smeltings carry out closed cycle to cyanide barren solution.But lean solution circulation always can cause various impurity, such as the accumulation of Cu, Zn, Pb, As, Sb etc., causes lean solution " fatigue ", affects leaching yield; Lean solution viscosity also can increase, and affects washing rate; Meanwhile, lean solution saltiness increases, and affects ore pulp precipitation.Therefore, recycle as lean solution always, need to remove processing to heavy metal ion such as the copper in lean solution, zinc, lead.
For making the recycle to extinction utilization containing golden lean solution, adopt now acid precipitation method to process lean solution, acid precipitation method first use acid for example sulfuric acid by lean solution acidifying, pH regulator to 2.0, yellow prussiate wherein, most copper, zinc, gold, lead are separated with precipitated form by precipitation operation from lean solution, open by indissoluble thing solid phase and containing prussiate liquid phase separation, in liquid phase, add lime to make it to be alkalescence, sulfate radical and calcium ion generate the calcium sulfate precipitation thing of indissoluble, after liquid-solid separation, liquid phase is for cyaniding.This technique need to be used a large amount of acid, alkali medicament, and processing cost is higher, and this technique uses large quantities of lime the calcium ion in lean solution is significantly increased, and affects golden Cyanide Leaching.
Summary of the invention
The object of the invention is the deficiency for single processing in prior art, propose the EDBM of a kind of membrane sepn combination twin-stage and process the technique of cyanide barren solution, concentrated by nanofiltration membrane to lean solution, less treatment capacity, improves the concentration of metal ion.By deliming, add ammoniacal liquor and enter twin-stage film and process and reclaim cheaply sodium cyanide and sodium hydroxide, after assorted the high density obtaining metallic solution is precipitated to recovery by sodium hydroxide.
For achieving the above object, technical scheme proposed by the invention is: the technique of cyanide barren solution is processed in the EDBM of a kind of membrane sepn combination twin-stage, it is characterized in that, comprises the steps:
Step 1: cyanide barren solution, after coarse filtration, carries out nanofiltration separation, obtains nanofiltration dialyzate and nanofiltration concentrated solution, and nanofiltration dialyzate is back to use cyanidation technology;
Step 2: nanofiltration concentrated solution adds calcium remover, stirs laggard row filter press, obtains filter press liquid;
Step 3: filter press liquid adds ammoniacal liquor, and heavy metal complex is resolved, and the solution after parsing enters bipolar membrane electrodialysis; Obtain respectively sodium hydroxide solution, sodium cyanide solution, assorted metallic solution; Sodium hydroxide solution, sodium cyanide solution are back to use cyanidation technology;
Step 4: assorted metallic solution passes through to add alkali solution precipitate, then after filter press, dialyzate reuse.
Further, described nanofiltration separation is preferably, and can to tolerate pH scope be pH1-14, the extraordinary nanofiltration membrane to sulfate radical without rejection effect.
Preferably, described nanofiltration separation is secondary nanofiltration separation, described cyanide barren solution enters first step nanofiltration separation after coarse filtration, obtain first step nanofiltration dialyzate and first step nanofiltration concentrated solution, described first step nanofiltration dialyzate enters second stage nanofiltration separation, obtains second stage nanofiltration dialyzate and second stage nanofiltration concentrated solution; Described first step nanofiltration concentrated solution and second stage nanofiltration concentrated solution are mixed into step 2 and process.
Further, described calcium remover is sodium carbonate, and described sodium carbonate addition is sodium carbonate 0.8-1.2g/L.
Preferably, described ammoniacal liquor addition is 9-13g/L.
Further, described coarse filtration is sand filtration.
Adopt technique scheme, the technique of cyanide barren solution is processed in membrane sepn combination twin-stage of the present invention EDBM, the beneficial effect having is: by nanofiltration+bipolar membrane electrodialysis, effective constituent in can efficient recovery cyanide barren solution, realize the recycling of water resources, there is technique simple, high treating effect.
Brief description of the drawings
Fig. 1 is the process flow sheet that cyanide barren solution is processed in the membrane sepn combination twin-stage EDBM described in prior art.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
The technical process of membrane sepn combination twin-stage EDBM processing cyanide barren solution of the present invention as shown in Figure 1.(note: the present invention ionic concn unit used is mg/L.）
Embodiment
Step 1: get cyanide barren solution through sand filtration, enter secondary nanofiltration treatment system, one-level nanofiltration membrane producing water ratio 70%, secondary nanofiltration producing water ratio 90%, total producing water ratio is 63%; Obtain dialyzate and concentrated solution.Experimental implementation data and experimental test data are as following table:
| Lean solution detects 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 |
Experimentation service data
Experimental test data:
One-level nanofiltration detects data:
Secondary nanofiltration detects data
Two-stage nanofiltration mixed concentrated liquid detects data:
Step 2: get 50L two-stage nanofiltration membrane mixed concentrated liquid, add calcium remover 50g sodium carbonate (sodium carbonate addition can be 0.8-1.2g/L), rapid stirring, press filtration, obtains press filtration filtrate and filter residue 150g.
| Mixed concentrated liquid detects data | Concentrated solution Ca 2+ | Concentrated solution Ca after deliming 2+ |
| 1 | 435 | 50 |
| 2 | 450 | 56 |
| 3 | 456 | 53 |
The filter press liquid of step 3:50L after deliming, add 0.5L ammoniacal liquor to react (ammoniacal liquor addition can be 9-13g/L), rapid stirring, heavy metal complex is resolved, reaction times is 10 minutes, after enter twin-stage EDBM plate, respectively sodium hydroxide solution, sodium cyanide solution, assorted metallic solution; Sodium hydroxide solution, sodium cyanide solution are back to use cyanidation technology;
The flow of each chamber
Laboratory test results
The water inlet of twin-stage film detects:
| Mixed concentrated liquid detects data | Cu 2+ | Fe 2+ | SO 4 2- | SCN - | CN - |
| 1 | 17762.89 | 3570.73 | 46183.81 | 27071.99 | 5674.32 |
| 2 | 17981.51 | 4482.41 | 49831.34 | 20864.14 | 5812.34 |
| 3 | 18357.80 | 4862.27 | 49150.47 | 21378.03 | 5687.56 |
Metal recovery cell detects:
| Metal recovery cell | Cu 2+ | Fe 2+ | SO 4 2- | SCN - | CN - |
| 1 | 1687.47 | 339.22 | 4387.46 | 2571.84 | 539.06 |
| 2 | 1708.24 | 425.83 | 4733.98 | 1982.09 | 552.17 |
| 3 | 1743.99 | 461.92 | 4669.29 | 2030.91 | 540.32 |
Sodium cyanide reclaims chamber and detects:
| Sodium cyanide reclaims chamber | Cu 2+ | Fe 2+ | SO 4 2- | SCN - | CN - |
| 1 | 888.14 | 178.54 | 90058.43 | 52790.38 | 11064.92 |
| 2 | 899.08 | 224.12 | 97171.11 | 40685.07 | 11334.06 |
| 3 | 917.89 | 243.11 | 95843.41 | 41687.16 | 11090.74 |
Step 4: get the water outlet of 10L metal recovery cell, add hydrochloric acid, regulate pH=7, through the reuse of press filtration dialyzate, add in hydrochloric acid process, need to be airtight, adopt sodium hydroxide to reclaim prussic acid gas.
In sum, adopt twin-stage membrane process to process cyanide barren solution, can remove 90% assorted metal, reclaim 90% sodium cyanide and sodium hydroxide.
In the above-described embodiments, only the present invention has been carried out to exemplary description, but those skilled in the art are reading after present patent application and can carry out various amendments to the present invention without departing from the spirit and scope of the present invention.
Claims (6)
1. a technique for cyanide barren solution is processed in the EDBM of membrane sepn combination twin-stage, it is characterized in that, comprises the steps:
Step 1: cyanide barren solution, after coarse filtration, carries out nanofiltration separation, obtains nanofiltration dialyzate and nanofiltration concentrated solution, and nanofiltration dialyzate is back to use cyanidation technology;
Step 2: nanofiltration concentrated solution adds calcium remover, stirs laggard row filter press, obtains filter press liquid;
Step 3: filter press liquid adds ammoniacal liquor, and heavy metal complex is resolved, and the solution after parsing enters bipolar membrane electrodialysis; Obtain respectively sodium hydroxide solution, sodium cyanide solution, assorted metallic solution; Sodium hydroxide solution, sodium cyanide solution are back to use cyanidation technology;
Step 4: assorted metallic solution passes through to add alkali solution precipitate, then after filter press, dialyzate reuse.
2. the technique of cyanide barren solution is processed in the EDBM of membrane sepn according to claim 1 combination twin-stage, it is characterized in that, described nanofiltration separation is preferably, and can to tolerate pH scope be pH1-14, to sulfate radical without rejection effect.
3. the technique of cyanide barren solution is processed in membrane sepn combination twin-stage according to claim 1 EDBM, it is characterized in that, described nanofiltration separation is secondary nanofiltration separation, described cyanide barren solution enters first step nanofiltration separation after coarse filtration, obtain first step nanofiltration dialyzate and first step nanofiltration concentrated solution, described first step nanofiltration dialyzate enters second stage nanofiltration separation, obtains second stage nanofiltration dialyzate and second stage nanofiltration concentrated solution; Described first step nanofiltration concentrated solution and second stage nanofiltration concentrated solution are mixed into step 2 and process.
4. the technique of cyanide barren solution is processed in membrane sepn combination twin-stage according to claim 1 EDBM, it is characterized in that, described calcium remover is sodium carbonate, and described sodium carbonate addition is sodium carbonate 0.8-1.2g/L.
5. the technique of cyanide barren solution is processed in membrane sepn combination twin-stage according to claim 1 EDBM, it is characterized in that, described ammoniacal liquor addition is 9-13g/L.
6. the technique of cyanide barren solution is processed in membrane sepn combination twin-stage according to claim 1 EDBM, it is characterized in that, described coarse filtration is sand filtration.
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| CN201410158442.9A CN103951119A (en) | 2014-04-20 | 2014-04-20 | Process for treating cyaniding barren liquor by combining membrane separation with two-stage membrane electrodialysis |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104891704A (en) * | 2015-05-05 | 2015-09-09 | 岳嵩 | High-salt content waste water treatment method |
| CN111393378A (en) * | 2020-04-13 | 2020-07-10 | 浙江迪萧环保科技有限公司 | Method for extracting sulfadimethoxine from sulfadimethoxine sodium alkali liquor |
| CN111592024A (en) * | 2020-04-24 | 2020-08-28 | 广西科学院 | Method for preparing submicron solid spherical calcium carbonate from calcium chloride |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2197525A1 (en) * | 1996-02-14 | 1997-08-15 | Mahabala R. Adiga | Plating waste water treatment and metals recovery method |
| CN102311181A (en) * | 2010-07-07 | 2012-01-11 | 刘春喜 | Embrane method and acidifying combined treatment reuse cyanide barren solution technology and method |
| CN102351352A (en) * | 2011-07-04 | 2012-02-15 | 昆明理工大学 | Electrodialysis-efficient evaporation method for treating mining and metallurgy waste water membrane filtrating concentrate |
| CN102452703A (en) * | 2010-10-27 | 2012-05-16 | 王辉 | Method for recovering resources from gold mine cyanide barren solution |
| CN102701339A (en) * | 2012-06-07 | 2012-10-03 | 中国海洋大学 | Recovery processing method of cyanide barren solution |
-
2014
- 2014-04-20 CN CN201410158442.9A patent/CN103951119A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2197525A1 (en) * | 1996-02-14 | 1997-08-15 | Mahabala R. Adiga | Plating waste water treatment and metals recovery method |
| CN102311181A (en) * | 2010-07-07 | 2012-01-11 | 刘春喜 | Embrane method and acidifying combined treatment reuse cyanide barren solution technology and method |
| CN102452703A (en) * | 2010-10-27 | 2012-05-16 | 王辉 | Method for recovering resources from gold mine cyanide barren solution |
| CN102351352A (en) * | 2011-07-04 | 2012-02-15 | 昆明理工大学 | Electrodialysis-efficient evaporation method for treating mining and metallurgy waste water membrane filtrating concentrate |
| CN102701339A (en) * | 2012-06-07 | 2012-10-03 | 中国海洋大学 | Recovery processing method of cyanide barren solution |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104891704A (en) * | 2015-05-05 | 2015-09-09 | 岳嵩 | High-salt content waste water treatment method |
| CN111393378A (en) * | 2020-04-13 | 2020-07-10 | 浙江迪萧环保科技有限公司 | Method for extracting sulfadimethoxine from sulfadimethoxine sodium alkali liquor |
| CN111393378B (en) * | 2020-04-13 | 2024-03-29 | 浙江迪萧科技有限公司 | Method for extracting sulfamonomethoxine from sulfamonomethoxine sodium alkali liquor |
| CN111592024A (en) * | 2020-04-24 | 2020-08-28 | 广西科学院 | Method for preparing submicron solid spherical calcium carbonate from calcium chloride |
| CN111592024B (en) * | 2020-04-24 | 2022-09-06 | 广西科学院 | Method for preparing submicron solid spherical calcium carbonate from calcium chloride |
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