CN106809811A - A kind of method that use crude product sodium pyrophosphate prepares sodium pyrophosphate - Google Patents
A kind of method that use crude product sodium pyrophosphate prepares sodium pyrophosphate Download PDFInfo
- Publication number
- CN106809811A CN106809811A CN201710150364.1A CN201710150364A CN106809811A CN 106809811 A CN106809811 A CN 106809811A CN 201710150364 A CN201710150364 A CN 201710150364A CN 106809811 A CN106809811 A CN 106809811A
- Authority
- CN
- China
- Prior art keywords
- sodium pyrophosphate
- mother liquor
- crude product
- filter
- sodium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/38—Condensed phosphates
- C01B25/42—Pyrophosphates
- C01B25/425—Pyrophosphates of alkali metals
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The present invention relates to a kind of method that use crude product sodium pyrophosphate prepares sodium pyrophosphate, its step is：(1) crude product sodium pyrophosphate washing mashing：1. previous cleaning；2. suction filtration；3. it is beaten；(2) sodium pyrophosphate purification：After sodium pyrophosphate slurries and molten slag filtrate mixed dissolution, the addition charcoal absorption that will dilute, carry out secondary filter, secondary filter filtrate and secondary filter filter residue are obtained, can obtain applying mechanically sodium pyrophosphate mother liquor and sodium pyrophosphate by secondary filter filtrate crystallisation by cooling, after filtering；(3) cycling and reutilization of sodium pyrophosphate mother liquor, sodium pyrophosphate disposing mother liquor is utilized, washing and the solvent of crude product sodium pyrophosphate are applied to simultaneously, the yield of sodium pyrophosphate greatly improved, reduce the content of sodium pyrophosphate in slag charge, business efficiency is improve, efficiency has been saved, cost is reduced.
Description
Technical field
The present invention relates to a kind of Sodium pyrophosphate preparation technology field, and in particular to one kind is prepared burnt using crude product sodium pyrophosphate
The method of sodium phosphate.
Background technology
Sodium pyrophosphate is an important kind in condensed phosphate.Either technical grade and food-grade, its consumption are only secondary
In sodium tripolyphosphate.It is industrial to be mainly used in complexing agent, degreasing agent, water treatment agent, washing printing and dyeing bleaching assistant, dispersant etc..
The water holding for being then used for food in food industry is fresh-keeping, anti-oxidant etc., is referred to as quality improver.With China's technical grade and food
The market fast development of level sodium pyrophosphate, associated core production technology application, research and development and improve will be as looking forward in the industry
The concern of industry.The improvement of the production technology of sodium pyrophosphate is very crucial for enterprise's lifting market competitiveness with research and development.And burnt phosphorus
Sour sodium demand is just in the trend that increases substantially year by year.According to statistics, national sodium pyrophosphate volume of production and marketing annual average rate of increase is
7% or so, so the development potentiality in pyrophosphoric acid market is very big.
Current crude product sodium pyrophosphate is that phosphorus-containing wastewater is obtained in high temperature furnace by flame incineration, due in burning process
Local temperature it is higher, make reaction uneven, be also easy to produce hardness it is higher and caking micro- waste residue material, this part slag charge is difficult molten
Solution, and the content of sodium pyrophosphate reaches 40-70wt% in slag charge, causes the wasting of resources.
The content of the invention
The present invention proposes a kind of method that use crude product sodium pyrophosphate prepares sodium pyrophosphate regarding to the issue above, by burnt phosphorus
Sour mother liquid of sodium is recycled, while being applied to washing and the solvent of crude product sodium pyrophosphate, the yield of sodium pyrophosphate greatly improved,
The content of sodium pyrophosphate in slag charge is reduced, business efficiency is improve, efficiency has been saved, cost is reduced.
Specific technical scheme is as follows：
A kind of method that use crude product sodium pyrophosphate prepares sodium pyrophosphate, its step is：
(1) crude product sodium pyrophosphate washing mashing：
1. previous cleaning：During crude product sodium pyrophosphate and sodium pyrophosphate mother liquor added into the stirred tank with filter, at 0-30 DEG C
At a temperature of stir 0.5-4h so that there is hydration reaction in the water in anhydrous sodium pyrophosphate and sodium pyrophosphate mother liquor, form the crystallization water
Compound, reclaims the part water in sodium pyrophosphate mother liquor, while being washed to the sodium chloride and organic matter in crude product, enters into surplus
In remaining sodium pyrophosphate mother liquor, the purpose of concentrate sodium pyrophosphate mother liquor is played, and reaction heat is removed in its course of reaction or is incited somebody to action
Sodium pyrophosphate mother liquor is previously cooled to less than 15 DEG C and is washed again, finally gives mixed liquor；
2. filter：After mixed liquor reacts in stirred tank and washing is complete, 50%- is extracted or extruded out by filter
80% filtrate, retains the filtrate of 20-50% in slurry in kettle, it is to avoid solid block, maintenance is stirred；
3. mashing discharging：Filtering terminate after immediately to added in stirred tank heat sodium pyrophosphate apply mechanically mother liquor re-start beat
Slurry so that sodium pyrophosphate dissolution of crystals, the sodium pyrophosphate slurries diluted after stirring；
(2) sodium pyrophosphate purification：
Will the sodium pyrophosphate slurries of dilution and molten slag filtrate mix fully dissolving after add oxidant, carry out oxidation reaction,
And adjusted to 11-12 pH value using sodium hydroxide solution, add charcoal absorption oily organic matter and Fe3+The colloid of formation
Precipitation, carries out secondary filter, obtains secondary filter filtrate and secondary filter filter residue, by hydrochloric acid or phosphoric acid by secondary filter filtrate
PH value adjust to 9.8-10.5, can obtain applying mechanically sodium pyrophosphate mother liquor by secondary filter filtrate crystallisation by cooling, after filtering
And sodium pyrophosphate；
(3) cycling and reutilization of sodium pyrophosphate mother liquor：
Sodium pyrophosphate mother liquor is applied mechanically according to 1 by what is be filtrated to get in step (2):The volume ratio of (1-4) is divided into applies mechanically burnt phosphorus
Sour mother liquid of sodium (1) and sodium pyrophosphate mother liquor (2) is applied mechanically, the sodium pyrophosphate in applying mechanically sodium pyrophosphate mother liquor (1) alternative steps (1) 1.
Mother liquor, apply mechanically sodium pyrophosphate mother liquor (2) for step (1) 3. in be beaten.
The method that a kind of above-mentioned use crude product sodium pyrophosphate prepares sodium pyrophosphate, wherein, the activated carbon accounts for crude product Jiao's phosphorus
The 0.02-0.1wt% of sour sodium slurries, activated carbon and molten slag filtrate mixed liquor.
The method that a kind of above-mentioned use crude product sodium pyrophosphate prepares sodium pyrophosphate, wherein, the preparation side of the molten slag filtrate
Method is：By secondary filter filter residue and 80-100 DEG C of water in bubbling or strong mixing, solid waste and molten slag are obtained after carrying out press filtration
Filtrate.
The method that a kind of above-mentioned use crude product sodium pyrophosphate prepares sodium pyrophosphate, wherein, the oxidant is hydrogen peroxide, chlorine
One or more of combination in sour sodium, chlorine dioxide, ozone.
The method that a kind of above-mentioned use crude product sodium pyrophosphate prepares sodium pyrophosphate, wherein, filled using washing in step (1)
Put, the wash mill includes stirred tank, waste tank and dissolution kettle, paddle, paddle lower section are provided with the stirred tank
It is provided with filter, filter will be separated into stir chamber and suction filtration chamber in stirred tank, stirred tank is provided with first charging aperture, second enters
Material mouth, suction filtration mouth and discharging opening, first charging aperture and second charging aperture are located at the top of stirred tank, are connected with stir chamber, take out
Filter mouth is located at the bottom of stirred tank, is connected with suction filtration chamber, and discharging opening is located between first charging aperture and suction filtration mouth, with stir chamber
It is connected；Suction filtration mouth is connected by the first pipeline with the 3rd charging aperture of waste tank, discharging opening by second pipe with it is molten
Solution kettle is connected.
Beneficial effects of the present invention are：
(1) present invention is greatly lowered fresh water consumption and needs sodium pyrophosphate mother liquor amount to be processed；Raw material is reduced to bring into
The impurity (can remove the sodium chloride and organic matter of 50-80% in crude product) of production, reduces production difficulty and production cost, improves and produces
Quality；
The characteristics of present invention is using low temperature mother liquor Jiao's sodium saturation wash sodium pyrophosphate crude product, it is to avoid the damage of utility
Lose, and the partial oxidation sodium in crude product and a small amount of organic matter are removed, the impurity that raw band enters in the burnt sodium purification production of reduction makes
Production is more prone to, and more preferably, mother liquid recycle number of times is more for product quality；
The characteristic of the crystallization water is formed using the moisture in anhydrous sodium pyrophosphate absorption mother liquor in sodium pyrophosphate crude product, by mother liquor
In moisture absorption, can use dissolution process in solid form, reduce industrial water amount, save final sodium pyrophosphate mother liquor amount
And processing cost；
The 50-80wt% of the filtrate of extraction, makes residual filtrate not lump, and is conducive to subsequent treatment, filtrate is distributed more
Uniformly, subsequent treatment is difficult to be blocked.
(2) present invention is processed during crude product sodium pyrophosphate purification production sodium pyrophosphate is produced using oxidant, is kept away
Exempt from other microsolubility phosphoric acid (pyrophosphoric acid) aluminium salts, phosphoric acid (pyrophosphoric acid) molysite, phosphoric acid (pyrophosphoric acid) calcium salt etc. and separate out influence product
Quality, solves that sodium pyrophosphate product is rubescent, or problem rubescent in product storage and use；Reduce impurity phosphoric acid (pyrophosphoric acid)
Salt brings sodium pyrophosphate product into, influences crystal habit, and improve product quality solves the problems, such as the production of filtration difficulty.
(3) present invention is reused mother liquor by applying mechanically a large amount of unsaturation mother liquors, reduces final mother liquor amount；Greatly
Width improves the yield of sodium pyrophosphate, reduces the content of sodium pyrophosphate in slag charge, improves business efficiency, has saved efficiency,
Reduce cost；
The Special use method that the present invention passes through sodium pyrophosphate mother liquor and water, it is to avoid slightly soluble impurity is to melting in material
The dissolving influence of thing, significantly improves dissolution velocity and dissolution degree, is greatly lowered and abandons solid waste amount；Impurity in solid waste is sandwiched
Sodium pyrophosphate is returned, and improves the yield 10-30% of burnt sodium product.
(4) present invention coordinates wash mill to use, first suction filtration portion filtrate in washing process, is in filter residue sticky but not
The state being fully cured, adds the new direct rising temperature for dissolving of sodium pyrophosphate mother liquor, then to move into that carry out next step in dissolution kettle anti-
Should, process is simplified, efficiency is improve, reduce cost.
Brief description of the drawings
Fig. 1 is present invention process flow chart.
Fig. 2 is wash mill sectional view of the present invention.
Fig. 3 is filter sectional view of the present invention.
Fig. 4 is sheet frame sectional view of the present invention.
Fig. 5 is filter group explosive view of the present invention.
Fig. 6 is filter top view of the present invention.
Specific embodiment
To make technical scheme become apparent from clearly, below the present invention is described further, it is any to this
The technical characteristic of inventive technique scheme carries out the scheme that equivalencing and conventional reasoning draw and each falls within the scope of the present invention.
Embodiment one
A kind of wash mill for the washing mashing of crude product sodium pyrophosphate, including stirred tank 1, waste tank 2 and dissolution kettle
3, paddle 4 is provided with the stirred tank, paddle lower section is provided with filter 5, and filter will be separated into stir chamber 6 in stirred tank
With suction filtration chamber 7, stirred tank is provided with first charging aperture 8, second charging aperture 9, suction filtration mouth 10 and discharging opening 11, first charging aperture and
Second charging aperture is located at the top of stirred tank, is connected with stir chamber, and suction filtration mouth is located at the bottom of stirred tank, is connected with suction filtration chamber
Logical, discharging opening is located between first charging aperture and suction filtration mouth, is connected with stir chamber；Suction filtration mouth passes through the first pipeline 12 and waste liquid
3rd charging aperture of storage tank is connected, and discharging opening is connected by second pipe 13 with dissolution kettle.
A kind of method that use crude product sodium pyrophosphate prepares sodium pyrophosphate, its step is as follows：
(1) crude product sodium pyrophosphate washing mashing：
1. previous cleaning：During crude product sodium pyrophosphate and sodium pyrophosphate mother liquor added into the stirred tank with filter, in 22 DEG C of temperature
The lower stirring 3h of degree so that anhydrous sodium pyrophosphate occurs hydration reaction with the water in sodium pyrophosphate mother liquor, forms crystalline hydrate, returns
The part water in sodium pyrophosphate mother liquor is received, while being washed to the sodium chloride and organic matter in crude product, remaining Jiao's phosphorus is entered into
In sour mother liquid of sodium, the purpose of concentrate sodium pyrophosphate mother liquor is played, and reaction heat is removed in its course of reaction or by pyrophosphoric acid
Mother liquid of sodium is previously cooled to less than 15 DEG C and is washed again, finally gives mixed liquor；
2. filter：After mixed liquor reacts in stirred tank and washing is complete, 72% is extracted or extruded out by filter
Filtrate, the filtrate of reservation 28% is in slurry in kettle, it is to avoid solid block, maintains stirring；
3. mashing discharging：Filtering terminate after immediately to added in stirred tank heat sodium pyrophosphate apply mechanically mother liquor re-start beat
Slurry so that sodium pyrophosphate dissolution of crystals, the sodium pyrophosphate slurries diluted after stirring；
(2) sodium pyrophosphate purification：
Will the sodium pyrophosphate slurries of dilution and molten slag filtrate mix fully dissolving after add oxidant, carry out oxidation reaction,
And adjusted to after 12 pH value using sodium hydroxide solution, add charcoal absorption oily organic matter and Fe3+The colloid of formation sinks
Form sediment, carry out secondary filter, obtain secondary filter filtrate and secondary filter filter residue, by hydrochloric acid or phosphoric acid by secondary filter filtrate
PH value is adjusted to after 10, can obtain applying mechanically sodium pyrophosphate mother liquor and pyrophosphoric acid by secondary filter filtrate crystallisation by cooling, after filtering
Sodium；
(3) cycling and reutilization of sodium pyrophosphate mother liquor：
Sodium pyrophosphate mother liquor is applied mechanically according to 1 by what is be filtrated to get in step (2):1.5 volume ratio is divided into applies mechanically pyrophosphoric acid
Mother liquid of sodium (1) and sodium pyrophosphate mother liquor (2) is applied mechanically, the sodium pyrophosphate in applying mechanically sodium pyrophosphate mother liquor (1) alternative steps (1) 1. is female
Liquid, apply mechanically sodium pyrophosphate mother liquor (2) for step (1) 3. in be beaten.
The activated carbon accounts for the 0.05wt% of crude product sodium pyrophosphate slurries, activated carbon and molten slag filtrate mixed liquor.
The preparation method of the molten slag filtrate is：By secondary filter filter residue and 90 DEG C of water in bubbling or strong mixing, pressed
Solid waste and molten slag filtrate are obtained after filter.
Embodiment two
A kind of method that use crude product sodium pyrophosphate prepares sodium pyrophosphate, its step is as follows：
(1) crude product sodium pyrophosphate washing mashing：
1. previous cleaning：During crude product sodium pyrophosphate and sodium pyrophosphate mother liquor added into the stirred tank with filter, in 15 DEG C of temperature
The lower stirring 2h of degree so that anhydrous sodium pyrophosphate occurs hydration reaction with the water in sodium pyrophosphate mother liquor, forms crystalline hydrate, returns
The part water in sodium pyrophosphate mother liquor is received, while being washed to the sodium chloride and organic matter in crude product, remaining Jiao's phosphorus is entered into
In sour mother liquid of sodium, the purpose of concentrate sodium pyrophosphate mother liquor is played, and sodium pyrophosphate mother liquor is previously cooled to less than 15 DEG C again
Washed, finally given mixed liquor；
2. filter：After mixed liquor reacts in stirred tank and washing is complete, 60% is extracted or extruded out by filter
Filtrate, the filtrate of reservation 40% is in slurry in kettle, it is to avoid solid block, maintains stirring；
3. mashing discharging：Filtering terminate after immediately to added in stirred tank heat sodium pyrophosphate apply mechanically mother liquor re-start beat
Slurry so that sodium pyrophosphate dissolution of crystals, the sodium pyrophosphate slurries diluted after stirring；
(2) sodium pyrophosphate purification：
Will the sodium pyrophosphate slurries of dilution and molten slag filtrate mix fully dissolving after add oxidant, carry out oxidation reaction,
And adjusted to after 11 pH value using sodium hydroxide solution, add charcoal absorption oily organic matter and Fe3+The colloid of formation sinks
Form sediment, carry out secondary filter, obtain secondary filter filtrate and secondary filter filter residue, by hydrochloric acid or phosphoric acid by secondary filter filtrate
PH value is adjusted to 10 can be obtained applying mechanically sodium pyrophosphate mother liquor and sodium pyrophosphate by secondary filter filtrate crystallisation by cooling, after filtering；
(3) cycling and reutilization of sodium pyrophosphate mother liquor：
Sodium pyrophosphate mother liquor is applied mechanically according to 1 by what is be filtrated to get in step (2):2 volume ratios are divided into applies mechanically sodium pyrophosphate mother
Liquid (1) and sodium pyrophosphate mother liquor (2) is applied mechanically, the sodium pyrophosphate mother liquor in applying mechanically sodium pyrophosphate mother liquor (1) alternative steps (1) 1.,
Apply mechanically sodium pyrophosphate mother liquor (2) for step (1) 3. in be beaten.
The activated carbon accounts for the 0.06t% of crude product sodium pyrophosphate slurries, activated carbon and molten slag filtrate mixed liquor.
The preparation method of the molten slag filtrate is：By secondary filter filter residue and 90 DEG C of water in bubbling or strong mixing, pressed
Solid waste and molten slag filtrate are obtained after filter.
Embodiment three
A kind of method that use crude product sodium pyrophosphate prepares sodium pyrophosphate, its step is as follows：
(1) crude product sodium pyrophosphate washing mashing：
1. previous cleaning：During crude product sodium pyrophosphate and sodium pyrophosphate mother liquor added into the stirred tank with filter, in 28 DEG C of temperature
The lower stirring 1.5h of degree so that anhydrous sodium pyrophosphate occurs hydration reaction with the water in sodium pyrophosphate mother liquor, forms crystalline hydrate,
The part water in sodium pyrophosphate mother liquor is reclaimed, while being washed to the sodium chloride and organic matter in crude product, remaining Jiao is entered into
In phosphoric acid mother liquid of sodium, the purpose of concentrate sodium pyrophosphate mother liquor is played, and reaction heat is removed in its course of reaction or by burnt phosphorus
Sour mother liquid of sodium is previously cooled to less than 15 DEG C and is washed again, finally gives mixed liquor；
2. filter：After mixed liquor reacts in stirred tank and washing is complete, 70% is extracted or extruded out by filter
Filtrate, the filtrate of reservation 30% is in slurry in kettle, it is to avoid solid block, maintains stirring；
3. mashing discharging：Filtering terminate after immediately to added in stirred tank heat sodium pyrophosphate apply mechanically mother liquor re-start beat
Slurry so that sodium pyrophosphate dissolution of crystals, the sodium pyrophosphate slurries diluted after stirring；
(2) sodium pyrophosphate purification：
Will the sodium pyrophosphate slurries of dilution and molten slag filtrate mix fully dissolving after add oxidant, carry out oxidation reaction,
And adjusted to after 12 pH value using sodium hydroxide solution, add charcoal absorption oily organic matter and Fe3+The colloid of formation sinks
Form sediment, carry out secondary filter, obtain secondary filter filtrate and secondary filter filter residue, by hydrochloric acid or phosphoric acid by secondary filter filtrate
PH value is adjusted to after 10, can obtain applying mechanically sodium pyrophosphate mother liquor and pyrophosphoric acid by secondary filter filtrate crystallisation by cooling, after filtering
Sodium；
(3) cycling and reutilization of sodium pyrophosphate mother liquor：
Sodium pyrophosphate mother liquor is applied mechanically according to 1 by what is be filtrated to get in step (2):3.2 volume ratio is divided into applies mechanically pyrophosphoric acid
Mother liquid of sodium (1) and sodium pyrophosphate mother liquor (2) is applied mechanically, the sodium pyrophosphate in applying mechanically sodium pyrophosphate mother liquor (1) alternative steps (1) 1. is female
Liquid, apply mechanically sodium pyrophosphate mother liquor (2) for step (1) 3. in be beaten.
The activated carbon accounts for the 0.08wt% of crude product sodium pyrophosphate slurries, activated carbon and molten slag filtrate mixed liquor.
The preparation method of the molten slag filtrate is：By secondary filter filter residue and 85 DEG C of water in bubbling or strong mixing, pressed
Solid waste and molten slag filtrate are obtained after filter.
The further filter is including sheet frame 14 and filters plate body 15, top board 16 of the sheet frame including cirque structure,
The base plate 17 of cirque structure and the circle side wall 18 being fixed between top board and base plate, the thickness h 1 of side wall is less than top board
Wall wide h2, the wall wide h2 of top board are equal to the wall wide h3 of base plate, and filtering plate body is arranged on the cavity that top board, base plate and side wall are surrounded
Interior, the filtering plate body includes two filter groups, and each filter group includes the first filter 19 and the second filter 20, the
The lower surface of one filter is uniformly provided with some first raised lines 21, and the first groove 22 is formed between two adjacent the first raised lines,
The upper surface of the second filter is uniformly provided with some second raised lines 23, and the second groove is formed between two adjacent the second raised lines
24, the width of the first raised line is L1, and the width of the first groove is L2, and the width of the second raised line is L3, and the width of the second groove is
L4, L1=L3 ＞ L2=L4, the first filter are positioned over the top of the second filter, and the first raised line and the second raised line interlock and set
Put, the first raised line of the first filter is pressed together on the second groove of the second filter, the second raised line pressure of the second filter
Close on the first groove of the first filter, two filter group mirror images are set, and the second filter of two filter groups is mutual
Contact.
Further, aperture of the aperture of first filter more than the second filter.
Further, the stir chamber cavity wall of the stirred tank is provided with the first heat tape 25, on the side wall of the sheet frame
Second heat tape of circle 26 is provided with, the base plate of sheet frame is provided with least 1 27 electric heating tubes of circle.The structure setting of filter, greatly
Width increased the filter effect of filter, reduce impurity content in filtrate, and the difficulty of subsequent concentration treatment is reduced with this, same with this
When, the reasonable distribution heating region in stirred tank makes to be uniformly heated, and reacts more complete.
The structure setting of filter, is added significantly to the filter effect of filter, reduces impurity content in filtrate, is dropped with this
The difficulty of low subsequent concentration treatment, at the same time, the reasonable distribution heating region in stirred tank makes to be uniformly heated, reaction
It is more complete.
Claims (5)
1. a kind of method that use crude product sodium pyrophosphate prepares sodium pyrophosphate, it is characterized by, its step is：
(1) crude product sodium pyrophosphate washing mashing：
1. previous cleaning：During crude product sodium pyrophosphate and sodium pyrophosphate mother liquor added into the stirred tank with filter, in 0-30 DEG C of temperature
Lower stirring 0.5-4h so that anhydrous sodium pyrophosphate occurs hydration reaction with the water in sodium pyrophosphate mother liquor, forms crystalline hydrate,
The part water in sodium pyrophosphate mother liquor is reclaimed, while being washed to the sodium chloride and organic matter in crude product, remaining Jiao is entered into
In phosphoric acid mother liquid of sodium, the purpose of concentrate sodium pyrophosphate mother liquor is played, and reaction heat is removed in its course of reaction or by burnt phosphorus
Sour mother liquid of sodium is previously cooled to less than 15 DEG C and is washed again, finally gives mixed liquor；
2. filter：After mixed liquor reacts in stirred tank and washing is complete, extract or extrude 50%-80%'s out by filter
Filtrate, retains the filtrate of 20-50% in slurry in kettle, it is to avoid solid block, maintenance is stirred；
3. mashing discharging：Filtering terminate after immediately to adding the sodium pyrophosphate of heat to apply mechanically mother liquor and re-start mashing in stirred tank,
So that sodium pyrophosphate dissolution of crystals, the sodium pyrophosphate slurries diluted after stirring；
(2) sodium pyrophosphate purification：
Oxidant is added after the sodium pyrophosphate slurries of dilution and molten slag filtrate are mixed into fully dissolving, oxidation reaction is carried out and is made
PH value is adjusted to 11-12 with sodium hydroxide solution, adds charcoal absorption oily organic matter and Fe3+The colloid of formation sinks
Form sediment, carry out secondary filter, obtain secondary filter filtrate and secondary filter filter residue, by hydrochloric acid or phosphoric acid by secondary filter filtrate
PH value is adjusted to 9.8-10.5, can obtain applying mechanically by secondary filter filtrate crystallisation by cooling, after filtering sodium pyrophosphate mother liquor and
Sodium pyrophosphate；
(3) cycling and reutilization of sodium pyrophosphate mother liquor：
Sodium pyrophosphate mother liquor is applied mechanically according to 1 by what is be filtrated to get in step (2):The volume ratio of (1-4) is divided into applies mechanically sodium pyrophosphate
Mother liquor (1) and sodium pyrophosphate mother liquor (2) is applied mechanically, the sodium pyrophosphate in applying mechanically sodium pyrophosphate mother liquor (1) alternative steps (1) 1. is female
Liquid, apply mechanically sodium pyrophosphate mother liquor (2) for step (1) 3. in be beaten.
2. the method that a kind of use crude product sodium pyrophosphate as claimed in claim 1 prepares sodium pyrophosphate, it is characterized by, the work
Property charcoal accounts for the 0.02-0.1wt% of crude product sodium pyrophosphate slurries, activated carbon and molten slag filtrate mixed liquor.
3. the method that a kind of use crude product sodium pyrophosphate as claimed in claim 1 prepares sodium pyrophosphate, it is characterized by, it is described molten
The preparation method of slag filtrate is：By secondary filter filter residue and 80-100 DEG C of water in bubbling or strong mixing, consolidated after carrying out press filtration
Body discarded object and molten slag filtrate.
4. the method that a kind of use crude product sodium pyrophosphate as claimed in claim 1 prepares sodium pyrophosphate, it is characterized by, the oxygen
Agent is one or more in hydrogen peroxide, sodium chlorate, chlorine dioxide, ozone of combination.
5. the method that a kind of use crude product sodium pyrophosphate as claimed in claim 1 prepares sodium pyrophosphate, it is characterized by, step
(1) wash mill, the wash mill are used in be included stirred tank, waste tank and dissolution kettle, is provided with the stirred tank and stirred
Mix leaf, paddle lower section is provided with filter, filter will be separated into stir chamber and suction filtration chamber in stirred tank, stirred tank is provided with the
One charging aperture, second charging aperture, suction filtration mouth and discharging opening, first charging aperture and second charging aperture are located at the top of stirred tank, with
Stir chamber is connected, and suction filtration mouth is located at the bottom of stirred tank, is connected with suction filtration chamber, and discharging opening is located at first charging aperture and suction filtration
Between mouthful, it is connected with stir chamber；Suction filtration mouth is connected by the first pipeline with the 3rd charging aperture of waste tank, and discharging opening leads to
Second pipe is crossed to be connected with dissolution kettle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710150364.1A CN106809811B (en) | 2017-03-14 | 2017-03-14 | A method of sodium pyrophosphate is prepared using crude product sodium pyrophosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710150364.1A CN106809811B (en) | 2017-03-14 | 2017-03-14 | A method of sodium pyrophosphate is prepared using crude product sodium pyrophosphate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106809811A true CN106809811A (en) | 2017-06-09 |
| CN106809811B CN106809811B (en) | 2019-06-14 |
Family
ID=59116502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710150364.1A Active CN106809811B (en) | 2017-03-14 | 2017-03-14 | A method of sodium pyrophosphate is prepared using crude product sodium pyrophosphate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106809811B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109399598A (en) * | 2018-12-28 | 2019-03-01 | 湖北泰盛化工有限公司 | A kind of method that the purification of crude product sodium pyrophosphate produces sodium pyrophosphate and sodium chloride |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101121506A (en) * | 2007-07-30 | 2008-02-13 | 四川宏达股份有限公司 | Technique for preparing sodium pyrophosphate from wet method phosphoric acid |
| CN101712466A (en) * | 2008-10-06 | 2010-05-26 | 天津市化学试剂研究所 | Method for preparing edible crystalline sodium pyrophosphate |
| CN104891466A (en) * | 2015-05-14 | 2015-09-09 | 湖北兴发化工集团股份有限公司 | Production method of instant food-grade sodium pyrophosphate |
| CN106335889A (en) * | 2016-08-18 | 2017-01-18 | 宜宾天原集团股份有限公司 | Method for producing sodium tripolyphosphate by utilization of crude sodium pyrophosphate |
-
2017
- 2017-03-14 CN CN201710150364.1A patent/CN106809811B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101121506A (en) * | 2007-07-30 | 2008-02-13 | 四川宏达股份有限公司 | Technique for preparing sodium pyrophosphate from wet method phosphoric acid |
| CN101712466A (en) * | 2008-10-06 | 2010-05-26 | 天津市化学试剂研究所 | Method for preparing edible crystalline sodium pyrophosphate |
| CN104891466A (en) * | 2015-05-14 | 2015-09-09 | 湖北兴发化工集团股份有限公司 | Production method of instant food-grade sodium pyrophosphate |
| CN106335889A (en) * | 2016-08-18 | 2017-01-18 | 宜宾天原集团股份有限公司 | Method for producing sodium tripolyphosphate by utilization of crude sodium pyrophosphate |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109399598A (en) * | 2018-12-28 | 2019-03-01 | 湖北泰盛化工有限公司 | A kind of method that the purification of crude product sodium pyrophosphate produces sodium pyrophosphate and sodium chloride |
| CN109399598B (en) * | 2018-12-28 | 2021-08-10 | 湖北泰盛化工有限公司 | Method for producing sodium pyrophosphate and sodium chloride by purifying crude sodium pyrophosphate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106809811B (en) | 2019-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108899601A (en) | A method of recycling lithium from LiFePO4 | |
| CN101899582A (en) | Method for extracting vanadium pentoxide from vanadium slag | |
| CN101899576A (en) | Method for recycling lead from lead-acid battery paste | |
| CN108821255A (en) | A kind of preparation method of ferric phosphate | |
| CN209428133U (en) | A kind of crude product sodium pyrophosphate purification produces the device of sodium ascorbyl phosphate and sodium chloride | |
| CN106495215B (en) | A kind of method that magnesium arsenate is produced containing arsenic waste solution | |
| CN109437137A (en) | A kind of method that the purification of crude product sodium pyrophosphate produces tertiary sodium phosphate and sodium chloride | |
| CN103351010A (en) | Preparation process of battery-grade lithium carbonate | |
| CN110747329A (en) | Electrolytic manganese dioxide production method based on bagasse papermaking white mud | |
| CN106335889B (en) | The method for producing sodium tripolyphosphate using thick sodium pyrophosphate | |
| CN106882781A (en) | A kind of method decolourized during crude product sodium pyrophosphate purification production sodium pyrophosphate product | |
| CN106809811A (en) | A kind of method that use crude product sodium pyrophosphate prepares sodium pyrophosphate | |
| CN109399598A (en) | A kind of method that the purification of crude product sodium pyrophosphate produces sodium pyrophosphate and sodium chloride | |
| CN212955279U (en) | Recovery unit who contains chromium aluminiferous mud | |
| CN104694978A (en) | Waste electrolyte treatment method and device | |
| CN206624648U (en) | A kind of device of crude product sodium pyrophosphate pretreatment | |
| CN105645482A (en) | Synthesis method of nickel protoxide precursor nickel carbonate | |
| CN112813273A (en) | Method for recycling cobalt, nickel and manganese in ternary battery positive electrode waste | |
| WO2023246156A1 (en) | Process for preparing lithium hydroxide by causticization and use thereof | |
| CN216972024U (en) | Cadmium removing device based on triple replacement of zinc sulfate solution | |
| CN217780770U (en) | System for producing nickel sulfate solution | |
| WO2017031949A1 (en) | Method for leaching low-grade lead-zinc oxide ores by means of electrooxidation, and leaching device thereof | |
| CN103351029A (en) | Method for processing waste liquid of titanium dioxide factory | |
| CN110195233A (en) | A kind of close continuous technique for extracting tellurium of big electricity | |
| CN106946237B (en) | A method of reducing generated solid waste when crude product sodium pyrophosphate production sodium pyrophosphate product |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |