CN103880207A - Calcium chloride-rich wastewater treatment method - Google Patents
Calcium chloride-rich wastewater treatment method Download PDFInfo
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- CN103880207A CN103880207A CN201210565493.4A CN201210565493A CN103880207A CN 103880207 A CN103880207 A CN 103880207A CN 201210565493 A CN201210565493 A CN 201210565493A CN 103880207 A CN103880207 A CN 103880207A
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- calcium
- chloride
- wastewater
- calcium chloride
- ammonium chloride
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- Fertilizers (AREA)
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Abstract
The invention discloses a calcium chloride-rich wastewater treatment method, and especially relates to treatment and reuse of calcium chloride in wastewater. The method comprises the following steps: reacting ammonium bicarbonate with calcium chloride to generate calcium bicarbonate and ammonium chloride; carrying out thermal decomposition on calcium bicarbonate to generate calcium carbonate precipitate, water and carbon dioxide; and reacting calcium hydroxide in the wastewater with carbon dioxide generated in the thermal decomposition of calcium bicarbonate to generate calcium carbonate precipitate and water. A low-price fertilizer product ammonium bicarbonate is utilized to react with calcium chloride in the wastewater in order to obtain two high-price products comprising calcium carbonate and ammonium chloride, so a large economic benefit is generated; and the wastewater is purified to form industrial purified water, so environmental protection and pollution elimination are realized, and the wastes are converted into high-value products.
Description
Technical field
The invention belongs to technical field of waste water processing, be specifically related to processing and the recycling of the calcium chloride in waste water.
Background technology
At present, production of propylene oxide enterprise, adopts chlorohydrination technique conventionally both at home and abroad, and the waste water that contains calcium chloride producing in production process is to belong to extremely unmanageable trade effluent, not only etching apparatus, and serious environment pollution.
The enterprise of the factory effluent of domestic contrast advanced person's processing propylene oxide is " the large Chemical Co., Ltd. in Shandong ", it controls useless principle is exactly multiple-effect evaporation, by the concentration of Waste water concentrating to 58～76% left and right, be processed as finished product and sell, the water of condensation of generation returns to production plant recycling.But due to the high cost of this wastewater treatment, and without economic benefit, so be not yet promoted.
Be abroad the waste water of processing the production chloride containing calcium of propylene oxide with membrane processing method, but because expense is too high, use and be also restricted.In a word, on our times, there is no the maturation of the factory effluent of processing propylene oxide, reliable treatment process.
Summary of the invention
The above-mentioned technical problem existing in order to overcome prior art field, the object of the invention is to, and a kind for the treatment of process that is rich in calcium chloride wastewater is provided, and has realized the environmental protection dirt that disappears, and refuse is converted into high-value product.
The treatment process that is rich in calcium chloride wastewater provided by the invention, comprises the following steps:
One, adopt bicarbonate of ammonia to react with calcium chloride, generate Calcium hydrogen carbonate and ammonium chloride;
Two, Calcium hydrogen carbonate thermolysis is generated to precipitation of calcium carbonate, water, carbonic acid gas;
Three, the calcium hydroxide in waste water is reacted with the C02 that Calcium hydrogen carbonate thermolysis generates, generate calcium carbonate and form sediment and water.
In described waste water, calcium chloride concentration is 5%, and the bicarbonate of ammonia that working concentration is 4-12% generates nanometer light calcium carbonate.The temperature condition of described Calcium hydrogen carbonate generation pyrolysis is: 70 DEG C-105 DEG C; The temperature condition of described Calcium hydrogen carbonate generation pyrolysis is 75 DEG C-105 DEG C; Reaction solution, by membrane sepn, concentrated, obtains the dense ammonium chloride solution of concentration more than 30%; Ammonium chloride solution, through further evaporation, crystallization, obtains crystal ammonium chloride, containing ammonium chloride and organic composite fertilizer material reaction solution and obtains technical pure water purification by reverse osmosis membrane.
The treatment process that is rich in calcium chloride wastewater provided by the invention, its beneficial effect is: utilize chemical fertilizer products bicarbonate of ammonia at a low price to react with the calcium chloride in waste water, obtain two kinds of higher price products of calcium carbonate and ammonium chloride, produced larger economic benefit; And be technical pure water purification by purification of waste water, realize the environmental protection dirt that disappears, refuse is converted into high-value product.
Embodiment
Below in conjunction with an embodiment, the treatment process that is rich in calcium chloride wastewater provided by the invention is described in detail.
Embodiment
A kind for the treatment of process that is rich in calcium chloride wastewater of the present embodiment, comprises the following steps:
One, adopt bicarbonate of ammonia to react with calcium chloride, generate Calcium hydrogen carbonate and ammonium chloride;
Two, Calcium hydrogen carbonate thermolysis is generated to precipitation of calcium carbonate, water, carbonic acid gas;
Three, the calcium hydroxide in waste water is reacted with the C02 that Calcium hydrogen carbonate thermolysis generates, generate calcium carbonate and form sediment and water.
Be 5% corresponding to chloride containing calcium concn in the waste water of product propylene, use the bicarbonate of ammonia of 5% concentration, the nano level light calcium carbonate of generation, without grinding, classification; And product cut size is even, can meet the requirement of nanometer top grade product.
Can there is good pyrolysis in Calcium hydrogen carbonate, can obtain the ammonium chloride solution of clarification after reaction solution solid-liquid separation at 90 DEG C of temperature, by membrane sepn, concentrated, can obtain the dense ammonium chloride solution of concentration more than 30%; Meanwhile, obtain technical pure water purification by reverse osmosis membrane; Ammonium chloride solution is through further evaporation, crystallization obtain crystal ammonium chloride pleat containing ammonium chloride and a small amount of organic composite fertilizer material.
Claims (4)
1. a treatment process that is rich in calcium chloride wastewater, is characterized in that: comprise the following steps:
One, adopt bicarbonate of ammonia to react with calcium chloride, generate Calcium hydrogen carbonate and ammonium chloride;
Two, Calcium hydrogen carbonate thermolysis is generated to precipitation of calcium carbonate, water, carbonic acid gas;
Three, the calcium hydroxide in waste water is reacted with the CO2 that Calcium hydrogen carbonate thermolysis generates, generate precipitation of calcium carbonate and water.
2. according to the treatment process that is rich in calcium chloride wastewater described in claim l, it is characterized in that: in described waste water, calcium chloride concentration is 5% that the bicarbonate of ammonia that working concentration is 4-12% generates nano level light calcium carbonate.
3. according to the treatment process that is rich in calcium chloride wastewater described in claim l, it is characterized in that: the temperature condition of described Calcium hydrogen carbonate generation pyrolysis is: 70 DEG C-105 DEG C.
4. according to the treatment process that is rich in calcium chloride wastewater described in claim l, it is characterized in that: reaction solution, by membrane sepn, concentrated, obtains the dense ammonium chloride solution of concentration more than 30%; Ammonium chloride solution, through further evaporation, crystallization, obtains crystal ammonium chloride, containing ammonium chloride and organic composite fertilizer material; Reaction solution obtains technical pure water purification by reverse osmosis membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210565493.4A CN103880207A (en) | 2012-12-23 | 2012-12-23 | Calcium chloride-rich wastewater treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210565493.4A CN103880207A (en) | 2012-12-23 | 2012-12-23 | Calcium chloride-rich wastewater treatment method |
Publications (1)
| Publication Number | Publication Date |
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| CN103880207A true CN103880207A (en) | 2014-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201210565493.4A Pending CN103880207A (en) | 2012-12-23 | 2012-12-23 | Calcium chloride-rich wastewater treatment method |
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| CN (1) | CN103880207A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106145490A (en) * | 2015-05-12 | 2016-11-23 | 刘风鸣 | A kind of expoxy propane calcium chloride saponification waste-water processes method of resource |
| CN110357355A (en) * | 2019-07-17 | 2019-10-22 | 青岛科技大学 | A kind of saliferous Glycerol Wastewater processing system and technique |
-
2012
- 2012-12-23 CN CN201210565493.4A patent/CN103880207A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106145490A (en) * | 2015-05-12 | 2016-11-23 | 刘风鸣 | A kind of expoxy propane calcium chloride saponification waste-water processes method of resource |
| CN110357355A (en) * | 2019-07-17 | 2019-10-22 | 青岛科技大学 | A kind of saliferous Glycerol Wastewater processing system and technique |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140625 |