CN103951024A - Method for separating calcium and magnesium ions in sodium chloride wastewater - Google Patents
Method for separating calcium and magnesium ions in sodium chloride wastewater Download PDFInfo
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- CN103951024A CN103951024A CN201410180092.6A CN201410180092A CN103951024A CN 103951024 A CN103951024 A CN 103951024A CN 201410180092 A CN201410180092 A CN 201410180092A CN 103951024 A CN103951024 A CN 103951024A
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- waste water
- sodium chloride
- calcium
- magnesium ion
- chloride waste
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Abstract
The invention relates to a method for separating calcium and magnesium ions in sodium chloride wastewater, and belongs to the technical field of wastewater treatment. The method comprises the following steps: adding soluble phosphates to wastewater to introduce phosphate radical to produce crystal precipitates of calcium phosphate and magnesium ammonium phosphate by utilizing a chemical precipitation method; then performing solid-liquid separation to remove calcium and magnesium ions from wastewater. The method is applicable to treatment of sodium chloride wastewater with various ion concentration and can reach high calcium and magnesium ion remove rate; the produced precipitates are crystal precipitates and solid-liquid separation is easily performed; in addition, the method is simple in process technology, does not produce any toxicity and harm, is easy in operation and control, and less in chemical agent consumption, easy in acquisition of the chemical agent, and low in wastewater treatment cost.
Description
Technical field
The present invention relates to a kind of method that separates calcium in sodium chloride waste water, magnesium ion, belong to technical field of waste water processing.
Background technology
Produce by rare earth ore concentrate separating-purifying the waste water producing in the process of single rare earth oxide compound and mainly contain two classes: the one, the saponification waste-water producing in Rare Earths Countercurrent Extraction Process; The 2nd, the heavy waste water of carbon producing in the heavy transformation process of carbon.Some Rare Earth Separation producer is for realizing trade effluent recycle at present, adopt following production model: the heavy transformation process of carbon adopts bicarbonate of ammonia to make precipitation agent, in extraction separation process, adopt sodium hydroxide to make saponifying agent, the waste water producing is mainly sodium chloride waste water, sodium chloride content higher (12-16%) in these waste water, can carry out recycling, but contain a large amount of calcium, magnesium ion in waste water, in treating processes, can affect efficiency and the service life of equipment of subsequent wastewater treatment technique; Calcium phosphate, magnesium ammonium phosphate solubility product constant are very little, and phosphoric acid salt precipitates removal, by strict control processing parameter, can realize the separation of calcium in sodium chloride waste water, magnesium ion.
Summary of the invention
The object of the present invention is to provide a kind of method that separates calcium in sodium chloride waste water, magnesium ion, the method, by adding soluble phosphate reagent, can realize high calcium, magnesium ion clearance.
Technical solution
A kind of method that separates calcium in sodium chloride waste water, magnesium ion, adopt chemical precipitation method, in waste water, add soluble phosphate to introduce phosphate radical, produce the crystalline precipitation of calcium phosphate, magnesium ammonium phosphate, carry out solid-liquid separation, and then calcium, magnesium ion in waste water are removed, its specific embodiment comprises the steps:
1) control temperature: 20-40 DEG C
2) first adjusting sodium chloride waste water pH value with bicarbonate of ammonia and ammoniacal liquor or ammoniacal liquor is 5-9.
3) selecting soluble phosphate is precipitation agent, with (NH4)
2hPO
4for example, according to calcium, magnesium ion concentration in raw wastewater, will be 0.9 ~ 1.10 (NH4) with coefficient of discharge (actual Secondary ammonium phosphate addition and the theoretical ratio of precipitated calcium, the required Secondary ammonium phosphate of magnesium ion completely)
2hPO
4precipitation agent, joins step 2 by adding the reinforced form of dry powder) in sodium chloride waste water, in reactive tank, stir 15 ~ 60min; Principal reaction is:
3Ca
2++2PO
4 3-=Ca
3(PO
4)
2↓
Mg
2++NH
4 ++PO
4 3-=MgNH
4PO
4↓
4) carry out solid-liquid separation, filtrate proceeds to subsequent treatment process.
Described a kind of technology method that separates calcium in sodium chloride waste water, magnesium ion, its soluble phosphate precipitation agent is (NH4)
2hPO
4, NH
4h
2pO
4, (NH
4)
3pO
4, Na
2hPO
4, NaH
2pO
4or Na
3pO
4one in reagent.
A kind of technology method sodium chloride waste water pH value control condition that separates calcium in sodium chloride waste water, magnesium ion as above is 5-7.
Advantage of the present invention:
The present invention is applicable to the sodium chloride waste water processing of various ionic concns, can reach very high calcium, magnesium ion clearance, generation be precipitated as crystalline precipitation, be easy to solid-liquid separation, Technology is simple, nontoxic, easy handling control, chemical reagent consumption is few and easily purchase, and cost for wastewater treatment is low.
The calcium phosphate generating is mainly used in the painted of pottery, glass, coating etc., for the manufacture of pottery, stained glass, newborn from glass; Can be used as domestic animal phosphorus calcium constituent additive, be applicable to acid soil and make base manure; Also can be used for polystyrene, styrene-acrylonitrile, expandable polystyrene polymerization and make dispersion agent, and the aspect such as biomaterial, fluorescent material.
The ammonium magnesium phosphate generating is as analytical reagent, also for pharmaceutical industry.
Calcium phosphate, ammonium magnesium phosphate provide raw material for downstream application technique.
Brief description of the drawings
Fig. 1 is process flow sheet of the present invention.
Embodiment
Embodiment 1
Reactive tank adds sodium chloride waste water 19 m
3, CaO:0.098 mol/L in waste water, MgO:0.013 mol/L, pH value is 6, under whipped state, with bicarbonate of ammonia adjust waste water ph be 7, then with strong aqua adjust pH value be 7.5.Add with 1.1 times of (NH of coefficient of discharge
4)
2hPO
4precipitation agent, stirring reaction 30min, stops stirring, and gets clear liquid analysis, CaO:0.001mol/L in waste water, MgO:0.0003mol/L, the clearance 98.97% of calcium, the clearance 97.69% of magnesium.After solid-liquid separation, filtrate proceeds to subsequent treatment process.
Embodiment 2
Reactive tank adds sodium chloride waste water 19 m
3, CaO:0.0132mol/L in waste water, MgO:0.0065 mol/L, pH value is 6, under whipped state, with bicarbonate of ammonia adjust waste water ph be 7, then with strong aqua adjust pH value be 7.5.Add with 1.0 times of (NH of coefficient of discharge
4)
2hPO
4precipitation agent, stirring reaction 30min, stops stirring, and gets clear liquid analysis, CaO:0.0011 mol/L in waste water, MgO:0.0002 mol/ L, the clearance 91.67% of calcium, the clearance 96.92% of magnesium.After solid-liquid separation, filtrate proceeds to subsequent treatment process.
Embodiment 3
Reactive tank adds sodium chloride waste water 19m
3, CaO:0.0212 mol/L in waste water, MgO:0.0077mol/L, pH value is 6, under whipped state, with bicarbonate of ammonia adjust waste water ph be 7, then with strong aqua adjust pH value be 7.5.Add with 1.1 times of (NH of coefficient of discharge
4)
2hPO
4precipitation agent, stirring reaction 30min, stops stirring, and gets clear liquid analysis, CaO:0.0005 mol/L in waste water, MgO:0.0001mol/L, the clearance 97.64% of calcium, the clearance 98.70% of magnesium.After solid-liquid separation, filtrate proceeds to subsequent treatment process.
Embodiment 4
Reactive tank adds sodium chloride waste water 19m
3, CaO:0.098 mol/L in waste water, MgO:0.013mol/L, pH value is 6, under whipped state, with bicarbonate of ammonia adjust waste water ph be 7, then with strong aqua adjust pH value be 7.5.Add with 1.0 times of NH of coefficient of discharge
4h
2pO
4precipitation agent, stirring reaction 30min, stops stirring, and gets clear liquid analysis, CaO:0.0014 mol/L in waste water, MgO:0.0006mol/L, the clearance 98.57% of calcium, the clearance 95.38% of magnesium.After solid-liquid separation, filtrate proceeds to subsequent treatment process.
Embodiment 5
Reactive tank adds sodium chloride waste water 19m3, CaO:0.098mol/L in waste water, MgO:0.013mol/L, pH value is 6, under whipped state, with strong aqua adjust pH be 7, add with coefficient of discharge 1.0 times of (NH
4)
3pO
4precipitation agent, stirring reaction 30min, stops stirring, and gets clear liquid analysis, CaO:0.0012 mol/L in waste water, MgO:0.0006mol/L, the clearance 98.77% of calcium, the clearance 95.381% of magnesium.After solid-liquid separation, filtrate proceeds to subsequent treatment process.
Embodiment 6
Reactive tank adds sodium chloride waste water 19m3, CaO:0.098 mol/L in waste water, MgO:0.013mol/L, pH value is 6, under whipped state, with strong aqua adjust pH be 7, add with coefficient of discharge 1.0 times of Na
3pO
4precipitation agent, stirring reaction 30min, stops stirring, and gets clear liquid analysis, CaO:0.0012 mol/L in waste water, MgO:0.0003mol/L, the clearance 98.77% of calcium, the clearance 90.77% of magnesium.After solid-liquid separation, filtrate proceeds to subsequent treatment process.
Embodiment 7
Reactive tank adds sodium chloride waste water 19m
3, CaO:0.098 mol/L in waste water, MgO:0.013mol/L, pH value is 6, under whipped state, with strong aqua adjust pH be 7.5, add with coefficient of discharge 1.0 times of Na
2hPO
4precipitation agent, stirring reaction 30min, stops stirring, and gets clear liquid analysis, CaO:0.0035 mol/L in waste water, MgO:0.002mol/L, the clearance 96.43% of calcium, the clearance 84.62% of magnesium.After solid-liquid separation, filtrate proceeds to subsequent treatment process.
Embodiment 8
Reactive tank adds sodium chloride waste water 19m
3, CaO:0.098 mol/L in waste water, MgO:0.013mol/L, pH value is 6, under whipped state, with strong aqua adjust pH be 7.5, add with coefficient of discharge 1.0 times of NaH
2pO
4precipitation agent, stirring reaction 30min, stops stirring, and gets clear liquid analysis, CaO:0.001 mol/L in waste water, MgO:0.0004mol/L, the clearance 98.98% of calcium, the clearance 96.92% of magnesium.After solid-liquid separation, filtrate proceeds to subsequent treatment process.
Claims (5)
1. one kind separates the method for calcium in sodium chloride waste water, magnesium ion, it is characterized in that: adopt chemical precipitation method, in waste water, add soluble phosphate to introduce phosphate radical, produce the crystalline precipitation of calcium phosphate, magnesium ammonium phosphate, carry out solid-liquid separation, and then calcium, magnesium ion in waste water are removed.
2. a kind of method that separates calcium in sodium chloride waste water, magnesium ion according to claim 1, is characterized in that: comprise following method steps:
1) control temperature: 20-40 DEG C;
2) first adjusting sodium chloride waste water pH value with bicarbonate of ammonia and ammoniacal liquor or ammoniacal liquor is 5-9;
3) selecting soluble phosphate is precipitation agent, according to calcium, magnesium ion concentration in sodium chloride waste water, will be 0.9-1.10 (NH4) with coefficient of discharge (actual Secondary ammonium phosphate addition and the theoretical ratio of precipitated calcium, the required Secondary ammonium phosphate of magnesium ion completely)
2hPO
4precipitation agent, joins step 2 by adding the reinforced form of dry powder) sodium chloride waste water in, in reactive tank, stir 15-60min; Principal reaction is:
3Ca
2++2PO
4 3-=Ca
3(PO
4)
2↓
Mg
2++NH
4 ++PO
4 3-=MgNH
4PO
4↓
4) carry out solid-liquid separation, filtrate proceeds to subsequent treatment process.
3. a kind of method that separates calcium in sodium chloride waste water, magnesium ion according to claim 2, is characterized in that: soluble phosphate precipitation agent is (NH4)
2hPO
4, NH
4h
2pO
4, (NH
4)
3pO
4, Na
2hPO4, NaH
2pO
4or Na
3pO
4one in reagent.
4. a kind of method that separates calcium in sodium chloride waste water, magnesium ion according to claim 2, is characterized in that: sodium chloride waste water pH value control condition is 5-7.
5. a kind of method that separates calcium in sodium chloride waste water, magnesium ion according to claim 2, is characterized in that, by the precipitation agent that is 0.9-1.10 with coefficient of discharge, joins step 2 by adding the reinforced form of dry powder) sodium chloride waste water in.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410180092.6A CN103951024A (en) | 2014-04-30 | 2014-04-30 | Method for separating calcium and magnesium ions in sodium chloride wastewater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410180092.6A CN103951024A (en) | 2014-04-30 | 2014-04-30 | Method for separating calcium and magnesium ions in sodium chloride wastewater |
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|---|---|
| CN103951024A true CN103951024A (en) | 2014-07-30 |
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ID=51328417
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| CN201410180092.6A Pending CN103951024A (en) | 2014-04-30 | 2014-04-30 | Method for separating calcium and magnesium ions in sodium chloride wastewater |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105174528A (en) * | 2015-07-18 | 2015-12-23 | 常州市鼎日环保科技有限公司 | Method for recovering phosphorus in culturing farm biogas slurry |
| CN105293662A (en) * | 2015-11-24 | 2016-02-03 | 福州大学 | Method for removing and recycling high-concentration Ca<2+> and Mg<2+> in leachate MBR and NF concentrate |
| CN113292188A (en) * | 2021-03-17 | 2021-08-24 | 华电水务工程有限公司 | Non-softening concentrated high-salinity wastewater treatment process based on precipitated salt recovery |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102502977A (en) * | 2011-11-01 | 2012-06-20 | 梁颖然 | Scale inhibition product and method for preventing scale from generating |
| CN102838977A (en) * | 2012-08-25 | 2012-12-26 | 东北石油大学 | Method of preparing polyacrylamide solution for recycling oilfield produced water including Ca<2+> and Mg<2+> |
| CN103449479A (en) * | 2013-09-12 | 2013-12-18 | 山东东岳氟硅材料有限公司 | Method for reducing content of calcium and magnesium ions in primary brine |
-
2014
- 2014-04-30 CN CN201410180092.6A patent/CN103951024A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102502977A (en) * | 2011-11-01 | 2012-06-20 | 梁颖然 | Scale inhibition product and method for preventing scale from generating |
| CN102838977A (en) * | 2012-08-25 | 2012-12-26 | 东北石油大学 | Method of preparing polyacrylamide solution for recycling oilfield produced water including Ca<2+> and Mg<2+> |
| CN103449479A (en) * | 2013-09-12 | 2013-12-18 | 山东东岳氟硅材料有限公司 | Method for reducing content of calcium and magnesium ions in primary brine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105174528A (en) * | 2015-07-18 | 2015-12-23 | 常州市鼎日环保科技有限公司 | Method for recovering phosphorus in culturing farm biogas slurry |
| CN105293662A (en) * | 2015-11-24 | 2016-02-03 | 福州大学 | Method for removing and recycling high-concentration Ca<2+> and Mg<2+> in leachate MBR and NF concentrate |
| CN113292188A (en) * | 2021-03-17 | 2021-08-24 | 华电水务工程有限公司 | Non-softening concentrated high-salinity wastewater treatment process based on precipitated salt recovery |
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Application publication date: 20140730 |
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