CN101049949A - Method for preparing dedicated Industrial salt for producing chlorine alkali through ion membrane method - Google Patents
Method for preparing dedicated Industrial salt for producing chlorine alkali through ion membrane method Download PDFInfo
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- CN101049949A CN101049949A CN 200710014117 CN200710014117A CN101049949A CN 101049949 A CN101049949 A CN 101049949A CN 200710014117 CN200710014117 CN 200710014117 CN 200710014117 A CN200710014117 A CN 200710014117A CN 101049949 A CN101049949 A CN 101049949A
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Abstract
This invention discloses an ion membrane method for preparing industrial salt for chloro-alkali production. In the first saline pool, wastes of soda production by anmonia-soda process are added at a ratio of 15-30 ton per 150,000 m3 brine, and are changed every year. The yearly average flow rate of the brine in the saline pool is 50-70 m3/h. The Mg2+ content of the industrial salt is lower than 0.05%, the SO42- content is lower than 0.32%, and the average ratio of Ca2+ to Mg2+ is larger than 2.0.
Description
Technical field the present invention relates to a kind of preparation method of Industrial Salt, and particularly a kind of ionic membrane method that adopts is produced in the chloralkali process preparation method as the special-purpose Industrial Salt of raw material.
Background technology is utilized in the common crude salt (main component sodium-chlor) that current methods produces, and magnesium ion and sulfate radical content are higher, and on the other hand, calcium ion and magnesium ion content ratio are on the low side.Produce in the technology of chlor-alkali at ionic membrane method, this problem can cause the shortening in work-ing life of this expensive consumable material of ionic membrane, and then causes the raising of production cost and the reduction of production efficiency.
Summary of the invention the objective of the invention is to overcome the deficiency of above-mentioned existing salt extraction process, and provide a kind of preparation method of dedicated Industrial salt for producing chlorine alkali through ion membrane method, technical problem to be solved is: by improving processing condition, make magnesium ion and sulfate radical content reduction in the crude salt, improve the content ratio of calcium ion and magnesium ion simultaneously.
The technical solution adopted in the present invention is as follows:
A kind of preparation method of dedicated Industrial salt for producing chlorine alkali through ion membrane method comprises the following steps of carrying out successively:
The first step: extract salt manufacturing bittern;
Second step: from bittern, carry bromine;
The 3rd step: second step was carried behind the bromine bittern first evaporation tank of flowing through;
The 4th step: the bittern after the 3rd step handled enters the subsequent evaporation pond and shines the salt pond;
It is characterized in that: in the 3rd step, add the waste material of ammonia alkali legal system alkali in the pond, add-on is: by the first evaporation tank bittern, 15 ten thousand steres, add the 15-30 ton, the annual replacing once; In the pond bittern annual flow velocity the 50-70 cubic meter/hour.
Preferred version is: in the 3rd step, the waste material add-on is in the pond: by the first evaporation bittern, 15 ten thousand steres, add the 20--25 ton, the annual replacing once; In the pond bittern annual flow velocity the 60--65 cubic meter/hour.
Positively effect of the present invention is: (1), (mensuration of calcium and magnesium ion is according to GB/T13025.6-91 through conventional method.The mensuration of sulfate ion is according to GB/T 13025.8-91.) repeated detection, this special use Industrial Salt magnesium ion content on average is lower than 0.05%, and sulfate radical content on average is lower than 0.32%, and the calcium ions and magnesium ions ratio is on average greater than 2.0.And the magnesium ion content of top grade general industry salt national Specification is 0.15%, and sulfate radical content is 0.50%, and the calcium ions and magnesium ions ratio is more than or equal to 1.0.This shows that magnesium ion and sulfate radical content reduce significantly in the special-purpose Industrial Salt of the present invention, the content ratio of calcium ion and magnesium ion increases substantially simultaneously.Therefore, can obviously prolong the work-ing life of chlor-alkali production ionic membrane.(2), in the ammonia alkali legal system alkali waste material, muriatic existence reduces water-quality guideline, harm underground water and soil as long as air storage has strong breeze to fly upward by alkaline residue, cause Air quality to worsen suddenly.Therefore, the present invention has positive effect for solving alkaline residue this " white pollution ".(3), the crude salt overall target improves, quality is more excellent.
Embodiment further specifies the present invention below in conjunction with specific embodiment.
Embodiment one
The first step: ordinary method extracts salt manufacturing bittern;
Second step: ordinary method is carried bromine from bittern;
The 3rd step: second step was carried behind the bromine bittern first evaporation tank of flowing through;
Add the waste material of ammonia alkali legal system alkali in the pond, add-on is: by first solarization salt pond bittern 15 ten thousand steres, add 15 tons, the annual replacing once; Bittern annual flow velocity is at 60 cubic metres/hour in the pond.
The 4th step: the bittern after the 3rd step handled enters the subsequent evaporation pond and shines the salt pond, and common process is evaporated brine.
Embodiment two
The first step: ordinary method extracts salt manufacturing bittern;
Second step: ordinary method is carried bromine from bittern;
The 3rd step: second step was carried behind the bromine bittern first evaporation tank of flowing through;
Add the waste material of ammonia alkali legal system alkali in the pond, add-on is: by through the first evaporation tank bittern, 15 ten thousand steres, add 25 tons, the annual replacing once; Bittern annual flow velocity is at 70 cubic metres/hour in the pond.
The 4th step: the bittern after the 3rd step handled enters the subsequent evaporation pond and shines the salt pond, and common process is evaporated brine.
Embodiment three
The first step: ordinary method extracts salt manufacturing bittern;
Second step: ordinary method is carried bromine from bittern;
The 3rd step: second step was carried behind the bromine bittern first evaporation tank of flowing through;
Add the waste material of ammonia alkali legal system alkali in the pond, add-on is: by the first evaporation tank bittern, 15 ten thousand steres, add 30 tons, the annual replacing once; Bittern annual flow velocity is at 50 cubic metres/hour in the pond.
The 4th step: the bittern after the 3rd step handled enters the subsequent evaporation pond and shines the salt pond, and common process is evaporated brine.
Embodiment four
The first step: ordinary method extracts salt manufacturing bittern;
Second step: ordinary method is carried bromine from bittern;
The 3rd step: second step was carried behind the bromine bittern first evaporation tank of flowing through;
Add the waste material of ammonia alkali legal system alkali in the pond, add-on is: by the first evaporation tank bittern, 15 ten thousand steres, add 20 tons, the annual replacing once; Bittern annual flow velocity is at 65 cubic metres/hour in the pond.
The 4th step: the bittern after the 3rd step handled enters the subsequent evaporation pond and shines the salt pond, and common process is evaporated brine.
This first bittern amount of flowing through of shining the salt pond is the annual flow that can produce about 8000 tons of salt.
Wherein, the waste material of ammonia alkali legal system alkali is sample examination repeatedly, and it is as follows to record component content: calcium chloride 50-60%, and calcium hydroxide: 10-15%, calcium oxide 5-10%, all the other are impurity such as water, sodium-chlor and lime carbonate.
Claims (2)
1, a kind of preparation method of dedicated Industrial salt for producing chlorine alkali through ion membrane method comprises the following steps of carrying out successively:
The first step: extract salt manufacturing bittern;
Second step: from bittern, carry bromine;
The 3rd step: second step was carried behind the bromine bittern first evaporation tank of flowing through;
The 4th step: the bittern after the 3rd step handled enters the subsequent evaporation pond and shines the salt pond;
It is characterized in that: in the 3rd step, add the waste material of ammonia alkali legal system alkali in the pond, add-on is: by the first evaporation tank bittern, 15 ten thousand steres, add the 15-30 ton, the annual replacing once; In the pond bittern annual flow velocity the 50-70 cubic meter/hour.
2, the preparation method of dedicated Industrial salt for producing chlorine alkali through ion membrane method as claimed in claim 1 is characterized in that: in the 3rd step, the waste material add-on is in the pond: by the first evaporation tank bittern, 15 ten thousand steres, add the 20--25 ton, the annual replacing once; In the pond bittern annual flow velocity the 60--65 cubic meter/hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710014117 CN101049949A (en) | 2007-03-28 | 2007-03-28 | Method for preparing dedicated Industrial salt for producing chlorine alkali through ion membrane method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710014117 CN101049949A (en) | 2007-03-28 | 2007-03-28 | Method for preparing dedicated Industrial salt for producing chlorine alkali through ion membrane method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101049949A true CN101049949A (en) | 2007-10-10 |
Family
ID=38781587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710014117 Withdrawn CN101049949A (en) | 2007-03-28 | 2007-03-28 | Method for preparing dedicated Industrial salt for producing chlorine alkali through ion membrane method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101049949A (en) |
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2007
- 2007-03-28 CN CN 200710014117 patent/CN101049949A/en not_active Withdrawn
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| C06 | Publication | ||
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| C04 | Withdrawal of patent application after publication (patent law 2001) | ||
| WW01 | Invention patent application withdrawn after publication |