Summary of the invention:
The technical problem to be solved in the present invention is: existing common lime finings exist because of lime emulsification incomplete, effective CaO content is low, soot particle is many, the above-mentioned harm that after reaction seriously causes, and the lime slake is not thorough, cause the lime utilization ratio low, the ropy problem of liquid glucose, a kind of CaO effective content height is provided, precipitin reaction speed is fast, and the lime slake is thorough, lime utilization ratio height, can effectively improve clarifying effect, improve sugar efficient lime finings and the making method and the application method in the liquid glucose clarification thereof of syrup quality.
The technical scheme that solves its above-mentioned technical problem is:
A kind of sugar efficient lime finings is characterized in that: this active lime finings is a kind of pulverous lime mixture, and each component concentration is by weight percentage in its mixture:
Effective CaO 〉=85% MgO≤4.5% SiO
2≤ 2.0%
Fe
2O
3≤0.3% Al
2O
3≤0.5% CaSO
4≤1.0%
Sucrose≤1 * 10
-3% NaCl≤1 * 10
-3%
Physical and chemical index is as follows:
Activity degree 250~300mL
Granularity≤125 μ m
As related art scheme of the present invention be: the above-mentioned sugar making method of efficient lime finings, it is characterized in that: the method includes the steps of:
A, get the raw materials ready: take by weighing following component raw material for standby in proportion, each component content is calculated as with parts by weight:
Wingdale-CaCO
3100 weight parts
Industrial salt-NaCl 0.025~0.1 amount part
General industry coal 8~12 weight parts
B, calcining:
Above-mentioned each component raw material is put into the limestone kiln, calcined 2~6 hours down at 900 ℃~1250 ℃;
C, pulverizing: the unslaked lime after will calcining is put into the grinding machine pulverizing makes its granularity less than 125 μ m;
D, classification: the unslaked lime after will pulverizing is by the grading machine classification, and its granularity is less than the sugar that the is the present invention efficient lime finings of 125 μ m.
As another related art scheme of the present invention be: above-mentioned sugar is with the application method of efficient lime finings in the liquid glucose clarification, comprise make milk of lime, add milk of lime, in and operation, it is characterized in that: described making milk of lime comprises following steps:
A, the first step slake:
Sugar is put into the 1st slake bucket with the efficient lime finings, use the efficient lime finings in sugar: water=100 weight parts: 55 ℃~70 ℃ hot water of ratio adding of 90~120 weight parts stir;
B, the second step slake:
Take out the 1st milk of lime that the slake bucket comes out, put into the 2nd slake bucket, and add a certain amount of 20 ℃~40 ℃ cold water, stir, milk of lime is diluted to 8~20Be;
Described interpolation milk of lime be will the 2nd slake bucket stir the milk of lime that obtains be pumped into stream smoke in and operation, add in the liquid glucose;
In described with operation: consistent with traditional method.
Because the present invention's sugar is as a systems engineering with links such as the production of lime, uses with efficient lime finings and making method and the utilization in liquid glucose is clarified thereof, the use of the choosing of Wingdale, calcination process control of process condition, efficient additive, sugar refinery production process are considered aspects such as the accessibility of the requirement of lime and use operation, harmonies comprehensively, thereby the present invention's sugar has following beneficial effect with efficient lime finings and making method and utilization thereof:
One, can improve clarifying effect, improve the syrup quality, can reduce production costs again.
1, the lime slake is thorough, has improved the utilization ratio of lime, reduces the consumption of lime, reduces cost:
Because the present invention's sugar is little with efficient lime finings particle, void content is big, specific surface area is big, the area that contacts with water is big, thereby fast with the speed of response of water, reduce or avoided the residual of slake lime particle not, improved the utilization ratio of lime, thereby reduced the consumption of lime, reduced production cost.
2, precipitin reaction speed is fast, and after reaction significantly reduces, thereby reduces the evaporation steam consumption, can improve clarifying effect, can reduce production costs again.
The present invention's sugar is little with efficient lime finings particle, and void content is big, has big specific surface, thereby can dissolve apace in water, keeps higher Ca (OH)
2Concentration, and milk of lime is fresh, and make: 1. precipitin reaction speed is fast, and effect of settling is good, and alleviates after reaction; 2. SO
2The specific absorption height, sulphur utilization ratio height; 3. the concentration of the clear juice in the stove drying and back was unlikely low, alleviated the burden of evaporization process, thereby reduced the evaporation steam consumption.
3, improve clarifying effect, improve the syrup quality.
Because efficient lime finings slake, the reaction fast of the present invention's sugar, thereby be easy to grasp and control the best ash amount that adds, avoid causing forming CaSO closely owing to adding excessive sucrose dicalcium, the sucrose DFP of forming of ash
3, Ca
3(PO
4)
2Or CaCO
3Precipitation and clarifying process is worsened.
On the other hand, the use of efficient lime finings of the present invention's sugar, do not exist because of the bad and residual lime particle of emulsification, the digestion of avoiding lagging behind raises sugarcane juice pH value or fluctuation, syrup is reached fast and keep stable p H, avoid the hysteresis of residual lime particle to digest the sedimentation that liberated heat has a strong impact on sugarcane juice simultaneously, guarantee that the quality of syrup and clear juice are settled stable, reduce the decomposition of the calcium content and the reducing sugar of clear juice.
Because of the present invention's sugar is few with the impurity of efficient lime finings, active high, speed of response is fast again, and the deposit seeds that obtains is even, solid, high adsorption capacity, and the throw out settling velocity is fast, thereby syrup is as clear as crystal, and quality is good, and settling bowl pressure is little, stable operation.
4, add ash and be easy to control, production smoothing
In the liquid glucose clarifying process, in and pH control very important, manually operated fluctuation is bigger.Because of the present invention sugar is Powdered with the efficient lime finings, be easy to realize adding the automatic control of grey process, make to add grey process stabilization that the pH fluctuation is little, can improve boiling house recovery, minimizing molasses productive rate; But while save operation cost.
Closed Circulation in Sugar Production is particularly clarified workshop section will accelerate the material processing, shortens residence time of material as far as possible, reduces conversion loss and bad variation in the production process.The present invention's sugar uses the efficient lime finings owing to reactive behavior height, milk of lime and SO
2The energy rapid reaction, the deposit seeds settling velocity that obtains is fast, has shortened the residence time of material in the settling vessel, thereby can avoid sugarcane juice to transform loss and bad variation, thereby improves boiling house recovery; Simultaneously, because the minimizing of after reaction, precipitation has reduced the content of inorganics in the syrup fully, makes sweet coefficient thereby reduce, and has improved the rate of recovery.
Two, the present invention's sugar can improve the working environment of workers, preserve the ecological environment with the use of efficient lime finings, has the good social benefit.
1, improve the working environment of workers: tradition is lump lime with common lime as finings, needs the artificial slaking apparatus that adds, work under bad environment, and labour intensity is big, and more seriously lime has corrodibility, and respiratory system and the skin to the people damages easily.And the present invention's sugar with the efficient lime finings owing to be Powdered unslaked lime, can adopt airtight basin to load and add automatically, the workman need not directly to contact with lime, avoids the injury of lime to the people, avoids the generation of occupational illness.
2, preserve the ecological environment
Traditional ordinary student lime can not be cleared up in water fully, a part unslaked lime be not made into milk of lime and and lime mud discharge together, not only make the unslaked lime utilization ratio low, waste is serious, running cost rises, and can cause the bulking effect of lime mud stockyard occurrence of large-area, and influence clearing of lime mud, cause pollution to environment.The present invention's sugar is used the efficient lime finings because the purity height; slake is thorough; the lime lime-ash is few; even a spot of lime mud is arranged; because the unslaked lime do not cleared up of the inside, therefore there is not after reaction yet and causes expansion, not only improved resource utilization; avoid or greatly reduced clearing of lime mud, help the protection of ecotope simultaneously.
Three, using method is easy, adds ash and is easy to control, production smoothing.
In the liquid glucose clarifying process, in and pH control very important, manually operated fluctuation is bigger.Because of the present invention's sugar is Powdered unslaked lime with the efficient lime finings, be easy to realize adding the automatic control of grey process, make to add grey process stabilization that the pH fluctuation is little; But while save operation cost.
Four, the present invention's sugar with the beneficial effect of the making method of efficient lime finings is: simple, the difficult generation given birth to burning and burn-off phenomenon, the active height of the unslaked lime of producing, CaO effective content height.
The present invention's sugar is with the mechanism of the making method of efficient lime finings: the interpolation of NaCl is used, caused the variation of the lime character of burning till, concrete reason is: the NaCl that has added Wingdale weight 0.25 ‰~0.1 ‰ in the limestone calcination process is in Wingdale, NaCl runs into high temperature and scraps fusion and volatilize in when calcining, form a kind of steam, its steam is to CaCO
3And MgCO
3Thermal degradation play the effect of gas bath and heating medium, simultaneously kiln temperature is played the stirring proportionality action, therefore, the giving birth to of lime burnt and burning has reduced;
When calcining belt temperature reached 1100~1300 ℃, NaCl steam was to CaCO
3And MgCO
3Decomposition and crystallization grow and to play the intensive katalysis, therefore decompose and produce thing CO
2Be easy to overflow, thereby accelerated CaCO
3And MgCO
3Decomposition reaction velocity.This crystallization combination is the identical polyhedron of crystallographic dimension, and void content is higher, and specific surface area is big, thereby has increased the reaction area of lime, has improved the activity degree of unslaked lime.The interpolation of NaCl is used, and causes that the variation of the lime character of burning till is in particular in the following aspects.
(1) the lime rerum natura changes
Adopt image analyzer, comparative analysis is in the rerum natura of the lime of 1100 ℃ of calcination.The lime that adds the NaCl calcination, pore on average long 6.20 μ m, wide 2.60 μ m, and pore quantity is many, most intercommunications.The lime that does not add the NaCl calcination, pore on average long 3.20 μ m, wide 1.16 μ m, and pore quantity is few.The reason that the former rerum natura is improved is because the lime kilning temperature far surpasses the fusing point of NaCl, thus the NaCl that is evaporated owing to proportion greater than CO
2, and deposition is shrouded on Wingdale or lime surface, even along CaCO
3Decompose and discharge CO
2Passage and spread the cause that penetrates in the CaO crystal, in case enter the NaCl steam in the CaO crystal, on its position, do long-range unordered thermal motion, not only hinder the volumetric shrinkage that the CaO recrystallize takes place, even aggravation crystal grain lack of alignment, intercrystalline is elongated, widens apart from vibrating, and forms the porous crystalline body of opening.
(2) the CaO xln changes
The coarse grain Wingdale is (as 950 ℃) when low temperature of combustion, just can access active higher lime.When higher calcination temperature (as 1100 ℃), just can not get active high lime.Its reason is that this lime discharges CO with regard to decomposing in the time of 950 ℃
2, to 1100 ℃ of continuous temperature-rise periods, CaO recrystallize generation volumetric shrinkage has formed smooth spheroidal or block crystal grain, puts up a bridge mutually and even merges and grow up.Intercrystalline is inlayed and fine and close apart from dwindling, and void content descends, and volumetric shrinkage etc. cause the active decline of lime.The lime that adds the NaCl calcination is exactly with above-mentioned opposite, at CaCO
3Old phase becomes in the CaO cenotype process gradually, and the NaCl steam bath is filled in the CaO cenotype, microscopic checks and intergranule, makes lattice deformability produce bigger defective, hinders that its merging is grown up or crystal shrinks.Because internuclear distance is different in CaO and the NaCl crystal, and NaCl distributes inhomogeneously again in the CaO crystal, and in crystallisation process, the two shrinks the effect of the thermal motion of different and NaCl, forms internal stress, causes lime internal fissure, hole generation.The CaO recrystallize that adds NaCl, with even tiny strip, between abrim the crystal grain of pore pile up to form loose crystalline structure, so the CaO xln that changes causes the active raising of lime.
(3) the lime activity improves with the rising of calcination temperature
Along with the rising of temperature of combustion, do not add the active decline of NaCl incendiary lime.In contrast, add the active raising of NaCl incinerating lime.Its reason is the rising along with calcining temperature, and the NaCl compound partial vapor pressure that is evaporated increases, and the NaCl compounds content that diffusion is infiltrated in the CaO crystal is also just many more, causes that the active degree that improves of lime is also just big more.Moreover, along with temperature of combustion raises, decomposition of limestone speeds up, favourable raising lime output.
Among the present invention, repeatedly test through the contriver, in the calcination process of sugar of the present invention with the making method of efficient lime finings, the NaCl weight of adding only is Wingdale weight 0.25 ‰~0.1 ‰, played both to be difficult for producing giving birth to and burnt and burn-off phenomenon, reach and make active high, the CaO effective content height of the unslaked lime of producing, the good effect that can reduce production costs again; The mixture that has particularly added NaCl and sucrose in crushing process is an additive, and the slake speed of lime is improved greatly, and solubleness also obviously improves, and has further improved sugared quality with the efficient lime finings.
Below, the sugar to the present invention is further described with the technical characterictic that efficient lime finings and making method reach the utilization in the liquid glucose clarification in conjunction with the embodiments.
Embodiment:
Embodiment one
A kind of sugar efficient lime finings, this active lime finings are a kind of pulverous lime mixtures, and each component concentration is by weight percentage in its mixture:
Effective CaO 〉=85% MgO≤4.5% SiO
2≤ 2.0%
Fe
2O
3≤0.3% Al
2O
3≤0.5% CaSO
4≤1.0%
Sucrose≤1 * 10
-3% NaCl≤1 * 10
-3%
Physical and chemical index is as follows:
Activity degree 250~300mL
Granularity≤125 μ m
Embodiment two:
The above-mentioned sugar making method of efficient lime finings comprises following steps:
A, get the raw materials ready: take by weighing following component raw material for standby in proportion, each component content is calculated as with parts by weight:
Wingdale-CaCO
3100 weight parts
Industrial salt-NaCl 0.05 weight part
General industry coal 10 weight parts
B, calcining:
Above-mentioned each component raw material is put into the limestone kiln, calcined 2~6 hours down at 900 ℃~1250 ℃;
C, pulverizing: the unslaked lime after will calcining is put into the grinding machine pulverizing makes its granularity less than 125 μ m;
D, classification: the unslaked lime after will pulverizing is by the grading machine classification, and its granularity is less than the sugar that the is the present invention efficient lime finings of 125 μ m.
A kind of conversion as the embodiment of the invention, the mixture that also can add NaCl and sucrose in the described pulverizing process is an additive, the consumption of this additive is 6~20ppm of unslaked lime weight, the ratio of NaCl and sucrose is 1: 1, the slake speed of lime is improved greatly, and solubleness also obviously improves.
As another conversion of the embodiment of the invention, described industrial salt-NaCl and general industry can also increase or reduce with the consumption of coal, and general industry with salt-NaCl consumption is: 0.025~0.1 weight part, the parts by weight of coal can be 8~12 weight parts.
In the present embodiment, industrial salt-NaCl all adopts common solid NaCl.
Embodiment three
The described sugar of claim 1 is used for the method for clarifying sugar liquid with the efficient lime finings, comprise make milk of lime, interpolation milk of lime, in and operation, described making milk of lime comprises following steps:
A, the first step slake:
Sugar is put into the 1st slake bucket with the efficient lime finings, use the efficient lime finings in sugar: water=100 weight parts: 60 ℃ of hot water of ratio adding of 100 weight parts stir;
B, the second step slake:
Take out the 1st milk of lime that the slake bucket comes out, put into the 2nd slake bucket, and add a certain amount of 30 ℃ cold water, stirring, milk of lime is diluted to 8~20Be;
As a kind of conversion of the embodiment of the invention, in the first step slake operation, sugar with the ratio of efficient lime finings and water can also can be for changing within the specific limits:
Sugar efficient lime finings: water=100 weight parts: 90 weight parts,
Or: sugar efficient lime finings: water=100 weight parts: 110 weight parts,
Or: sugar efficient lime finings: water=100 weight parts: 120 weight parts,
The first step slake can be high slightly or low slightly with the temperature of hot water, and its span is: 55 ℃~70 ℃;
The second step slake also can be high slightly or low slightly with the temperature of cold water, and its span is: 20 ℃~40 ℃.
The method of described interpolation milk of lime be will the 2nd slake bucket stir the milk of lime that obtains be pumped into stream smoke in and operation, add in the liquid glucose.
In described with operation: consistent with traditional method.
In above-mentioned making milk of lime operation, present embodiment is that sugar is stored in the basin with the efficient lime finings, be delivered to the 1st slake bucket (referring to Fig. 1) by worm conveyor, alleviated working strength of workers greatly, certainly, also can carry, and use other manual or self-feeding modes instead without worm conveyor.