CN1724355A - Process for preparing bentonite based sodium with high expension performance by drying method - Google Patents
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Abstract
A process for preparing high-expansibility Na-based bentone by dry method includes such steps as proportionally mixing bentone powder, sodium salt powder and urea powder, and heating at 85-120 deg. C for 0.5-5 hr. Its expansibility can reach 40-95 ml/g.
Description
Technical field
The present invention relates to a kind of process for preparing bentonite based sodium with high expension performance by drying method, belonging to high-expansion can the preparation of sodium group bentonite technical field.
Background technology
Wilkinite claims otaylite or amargosite etc. again, is to be the tonstein-montmorillonitic clay rock of main component with the montmorillonite.Because wilkinite has swelling property, water-absorbent, dispersiveness, adsorptivity, catalytic activity, thixotropy, cationic exchange and performance such as lubricated, be widely used in more than 100 industries in 24 fields such as absorption, soil improvement, pottery, building material, electrically insulating material, makeup, soap and food, carrier, fodder additives of metallurgical briquetting, casting type sand adhesvie, papermaking, rubber industry filler, printing and dyeing rinsing, petrochemical complex, daily-use chemical industry, coating, environment protection, weaving, medicine, radioactive substance.The wilkinite mineral products resource of China is very abundant, mineral products almost spread all over the country, its reserves occupy the second place of the world, but the sodium bentonite of the natural output of excellent property seldom, the wilkinite of most natural outputs is a calcium-base bentonite, poor performance, the quality instability is difficult to reach the application standard of industrial sector.Because sodium bentonite has better swelling property, cationic exchange, colloid dispersiveness, thixotropy, cohesiveness, oilness and thermostability than calcium-base bentonite, so it is of many uses, and be worth high, therefore, calcium-base bentonite artificial modification (sodium processing) that expansion character is relatively poor be prepared into high-expansion can sodium bentonite be the first step of wilkinite deep processing.
Montmorillonite is bentonitic main component, is a kind of mineral the most general in the smectite family, and it has 2: 1 type crystal structure that two-layer silicon-oxy tetrahedron folder layer of aluminum oxygen octahedra is formed, and the thickness of each lamella of montmorillonite is about 1nm; Length and the wide 100nm that respectively is about.The natural montmorillonite lamella in forming process, part Si in the tetrahedron
4+By Al
3+Replace part Al in the octahedron
3+By Mg
2+After replacing, crystal becomes electronegativity, and for reaching charge balance, interlayer is adsorbing Ca
2+, Mg
2+Deng positively charged ion.Bentonitic artificial modification uses Na just
+Ion is with tradable high-valence cationic Ca between bentonite bed
2+, Mg
2+Cement out.
The chemical equation of calcium-base bentonite sodium can be expressed as:
This is an alkali permutoid reaction, needs just can carry out in the presence of water.Under the general condition, be not easy to make very much above-mentioned reaction to reach fully, because the calcium soil insoluble form of flake crystal that is water, it can only suspend in water with the form (being the coarse particles state) of folded brilliant aggregate, and calcium soil and sodium salt reaction just carry out on the particulate surface.Sodium the top layer, owing to hydration has formed a water-separating film, be wrapped in the not calcium soil of sodium of granule interior, if this one deck sodium film can not in time peel off, will influence the sodium of nexine, cause " half-cooked " phenomenon and a large amount of unreacted free sodium salt to exist, the two all has adverse influence to quality product and mud property.Therefore whether natridization reaction can be complete, and key is sodium method and condition, just used modified device and technology.
Wilkinite sodium method of modifying mainly contains following several at present:
1, solion exchange process: the raw material wilkinite is put into hot water, add sodium thing (as NaCl etc.) reaction more than 10 hours, obtain product through operations such as the filtration of trouble, washing, drying, pulverizing then, production efficiency is lower, energy consumption is big.
2, stockyard sodium method: with after light ash mixes, ion exchange reaction is finished in the ageing of banking up with the moor ore deposit, and this method mechanization degree is higher, but consuming time longer.
3, extruding sodium method: Chinese patent publication number CN1011879 B has proposed the fragmentation of moor ore deposit, in the duplex stirring mixer, mix with light ash, in the duplex reactor, stand shearing strain again and finish ion exchange reaction, and produce the method for sodium bentonite after dry (or oven dry) grinding with certain pressure.This method need be more with equipment, and operational path is longer, and production cost is higher, is difficult to accomplish scale production.
4, Raymond mill sodium method: Chinese patent publication number CN1194940A has proposed to contain the raw ore of calcium base bentonite and the Na of a certain amount of moisture
2CO
3Thereby grinding obtains the method for sodium bentonite in the adding Raymond mill, but this method is to wilkinite moisture content have relatively high expectations (moisture content need reach 13～18%), and the adaptability problem of material and equipment can appear when higher in moisture, this method material and equipment are shorter action time in addition, it is incomplete to be prone to sodium, and it is limited that gained wilkinite product expansion character is improved.
5, microwave sodium method: Chinese patent publication number CN1454941A proposed a kind ofly to promote the dry method sodium method that natridization reaction carries out with microwave, and this technology is higher to equipment requirements, and investment is big, and sodium agent consumption is also bigger.
In addition, patent related to the present invention also has Chinese patent publication number CN1563207A, thereby this patent disclosure a kind of heating of urea and montmorillonite is mixed make urea enter the method that increases montmorillonite (001) surface layer spacing between montmorillonite layer, but the effect that this method can not play the sodium effect and well improve bentonitic expansion character and dispersing property.
In sum, the method ubiquity sodium time of existing wilkinite sodium long, to defectives such as equipment requirements height, sodium product expansion character are limited.
Summary of the invention
The object of the present invention is to provide a kind of operation simple, the sodium time is short, and equipment requirements is low, the process for preparing bentonite based sodium with high expension performance by drying method of sodium product expansion character excellence.
The present invention is a process for preparing bentonite based sodium with high expension performance by drying method, it is characterized in that wilkinite powder and sodium salt powder and urea powder evenly mixedly, is heated to 85～120 ℃, constant temperature 0.5～5 hour, and obtaining high-expansion can sodium bentonite; The add-on of described sodium salt powder and urea powder is respectively 2%～6% and 2%～30% of wilkinite powder weight percent.
Described sodium salt can be yellow soda ash, any of Sodium Fluoride etc. or its mixture.
The add-on of described urea powder can be 2%～20% of wilkinite powder weight percent.
Described wilkinite powder can be calcium base or calcium sodium base, sodium calcium base, sodium bentonite.
The moisture content of described wilkinite powder can be 5～20%, and particle diameter is less than 80 μ m.Preferentially can be less than 45 μ m.
Described Heating temperature preferentially can be 85～100 ℃.
The expansion of described high-expansion energy sodium bentonite doubly can be 40～95mL/g.
Described heating installation can be Hybrid Heating equipment or baking oven.
Principle of the present invention:
Become calcium-base bentonite and create the sodium salt ionization conditions exactly, make the calcium ion generation permutoid reaction between the montmorillonite crystal layer in sodium ion and the calcium-base bentonite, and create the envrionment conditions of accelerating permutoid reaction into the principle of sodium bentonite.
Technology of the present invention has been created and has been promoted the requirement that ion exchange reaction is carried out fast:
1, thereby sodium salt dry powder can be dissolved the Na that produces enough concentration by the moisture of self in the wilkinite
+Ion is for sodium provides material guarantee;
2, heating installation remains between 85～120 ℃ temperature of charge, has excited the activity of sodium initiator urea, and has accelerated ion exchange reaction speed;
3, byproduct of reaction is a calcium salt, as CaCO
3Or CaF
2Deng, be insoluble in water, therefore limited ion exchange reaction and carried out to opposite direction.
4, the adding of initiator urea has changed the interlayer microenvironment of montmorillonite, helps that sodium ion enters interlayer and the sodium salt negatively charged ion carries out the edge modification to the montmorillonite lamella, thereby obtains the sodium bentonite of polymolecularity and colloidal property.
The present invention compared with prior art has following outstanding advantage and positively effect:
1, sodium salt and urea are organically combined, and optimization design add-on separately, its synergy can make calcium base or the quick sodium of calcium sodium bentonite, and obtains high-expansion energy sodium bentonite.Fully excited bentonitic performance potential, the expansion that the gained high-expansion can sodium bentonite doubly and colloid index be several times of other sodium method, the good dispersity in water, the mud colloidal property is good.
2, adopt dry method modification wilkinite technology, modification is not high to the moisture requirement of material, and apparatus adaptability is strong, and production technique is simple, and production process does not have waste and environmental pollution problem.
3, production unit is few, only needs Hybrid Heating equipment or baking oven, need not wear out, dewaters, technology such as drying and secondary pulverizing, and is with short production cycle, less investment, and low, the instant effect of cost is easy to realize suitability for industrialized production.
4, the interpolation urea initiator that is added, nontoxic, raw material is easy to get, and is with low cost.
Description of drawings
Fig. 1 is Anji, the Zhejiang calcium-base bentonite former state XRD figure of the embodiment of the invention 1～8;
Fig. 2 is Anji, the Zhejiang calcium-base bentonite sodium sample XRD figure of the embodiment of the invention 2;
Fig. 3 is Anji, the Zhejiang calcium-base bentonite sodium sample XRD figure of the embodiment of the invention 3;
Fig. 4 is Anji, the Zhejiang calcium-base bentonite sodium sample XRD figure of the embodiment of the invention 4;
Fig. 5 is Anji, the Zhejiang calcium-base bentonite sodium sample XRD figure of the embodiment of the invention 7;
Fig. 6 is Anji, the Zhejiang calcium-base bentonite sodium sample XRD figure of the embodiment of the invention 8;
Fig. 7 is Liaoning calcium-base bentonite former state XRD figure of the embodiment of the invention 9～10;
Fig. 8 is Liaoning calcium-base bentonite sodium sample XRD figure of the embodiment of the invention 10.
Embodiment
Prior art Comparative Examples 1, single interpolation yellow soda ash does not add urea:
With Anji calcium-base bentonite powder, the 4g Na of 100g less than 45 μ m (less than 325 orders) moisture content 11.5%
2CO
3After powder mixes, put into baking oven, constant temperature 3h between 85～120 ℃ expands doubly and colloid index according to wilkinite method for testing performance (JC/T 593-1995) detection, and the result is: times 24mL/g that expands, colloid index 153mL/15g.
Prior art Comparative Examples 2, single interpolation urea does not add yellow soda ash:
After 100g mixed less than Anji calcium-base bentonite powder, the 10g urea powder of 45 μ m (less than 325 orders) moisture content 11.5%, put into baking oven, constant temperature 3h between 85～120 ℃, expand doubly and colloid index according to wilkinite method for testing performance (JC/T 593-1995) detection, the result is: times 17mL/g that expands, colloid index 99mL/15g.
Embodiment 1:
With Anji wilkinite powder, 6g urea powder and the 1.2g Na of 60g less than 45 μ m (less than 325 orders) moisture content 11.5%
2CO
3After powder mixes, put into baking oven, constant temperature 3h between 85～120 ℃ expands doubly and colloid index according to wilkinite method for testing performance (JC/T 593-1995) detection, and the result is: times 41mL/g that expands, colloid index 500mL/15g.
Embodiment 2:
With Anji wilkinite powder, 10g urea powder and the 3g Na of 100g less than 45 μ m (less than 325 orders) moisture content 11.5%
2CO
3After powder mixes, put into baking oven, constant temperature 3h between 85～120 ℃ expands doubly and colloid index according to wilkinite method for testing performance (JC/T 593-1995) detection, and the result is: times 56mL/g that expands, colloid index 500mL/15g.Utilize X-ray diffraction analysis (XRD) to detect and handle the front and back bentonitic structural changes in Anji.Anji calcium-base bentonite former state is seen accompanying drawing 1, and the veil spacing d value of its montmorillonite (001) face is 1.50nm; The XRD analysis of the high-expansion energy sodium bentonite after present method is handled is seen accompanying drawing 2, and the veil spacing d value of its montmorillonite (001) face reduces to 1.30nm.
Embodiment 3:
With Anji wilkinite powder, 50g urea powder and the 40g Na of 1kg less than 45 μ m (less than 325 orders) moisture content 11.5%
2CO
3After powder mixes, put into baking oven, constant temperature 3h between 85～120 ℃ expands doubly and colloid index according to wilkinite method for testing performance (JC/T 593-1995) detection, and the result is: times 80mL/g that expands, colloid index 500mL/15g.Utilize the high-expansion energy sodium bentonite of X-ray diffraction analysis (XRD) detection after present method is handled, the veil spacing d value of its montmorillonite (001) face is decreased to 1.25nm by the 1.50nm before handling, and sees accompanying drawing 3.
Embodiment 4:
With Anji wilkinite powder, 150g urea powder and the 60g Na of 1.5kg less than 45 μ m (less than 325 orders) moisture content 11.5%
2CO
3After powder mixes, put into baking oven, constant temperature 2.5h between 85～120 ℃ expands doubly and colloid index according to wilkinite method for testing performance (JC/T 593-1995) detection, and the result is: times 93mL/g that expands, colloid index 500mL/15g.Utilize the high-expansion energy sodium bentonite of X-ray diffraction analysis (XRD) detection after present method is handled, the veil spacing d value of its montmorillonite (001) face is decreased to 1.27nm by the 1.50nm before handling, and sees accompanying drawing 4.
Embodiment 5:
With Anji wilkinite powder, 100g urea powder and the 80g Na of 2kg less than 45 μ m (less than 325 orders) moisture content 8%
2CO
3After powder mixes, put into baking oven, constant temperature 3h between 85～120 ℃ expands doubly and colloid index according to wilkinite method for testing performance (JC/T 593-1995) detection, and the result is: times 69mL/g that expands, colloid index 500mL/15g.
Embodiment 6:
With 2kg less than 76 μ m (less than 200 orders), Anji wilkinite powder, 100g urea powder and the 80g Na of moisture content 11.5%
2CO
3After powder mixes, put into baking oven, constant temperature 4h between 85～120 ℃ expands doubly and colloid index according to wilkinite method for testing performance (JC/T 593-1995) detection, and the result is: times 51mL/g that expands, colloid index 500mL/15g.
Embodiment 7:
With Anji wilkinite powder, 500g urea powder and the 100g Na of 2.5kg less than 45 μ m (less than 325 orders) moisture content 11.5%
2CO
3After powder mixes, put into baking oven, constant temperature 2.5h between 85～120 ℃ expands doubly and colloid index according to wilkinite method for testing performance (JC/T 593-1995) detection, and the result is: times 94mL/g that expands, colloid index 500mL/15g.Utilize the high-expansion energy sodium bentonite of X-ray diffraction analysis (XRD) detection after present method is handled, the veil spacing d value of its montmorillonite (001) face increases to 1.61nm by the 1.50nm before handling, and sees accompanying drawing 5.
Embodiment 8:
With Anji wilkinite powder, 250g urea powder and the 100g Na of 2.5kg less than 45 μ m (less than 325 orders) moisture content 11.5%
2CO
3Powder is put into the SHR10 high-speed mixer, between 85～120 ℃, rotating speed is high-speed mixing 0.5h under the 3000r/min condition, detects according to wilkinite method for testing performance (JC/T 593-1995) and expands doubly and colloid index, the result is: times 92mL/g that expands, colloid index 500mL/15g.Utilize the high-expansion energy sodium bentonite of X-ray diffraction analysis (XRD) detection after present method is handled, the veil spacing d value of its montmorillonite (001) face is decreased to 1.20nm by the 1.50nm before handling, and sees accompanying drawing 6.
Embodiment 9:
After 3kg mixed less than Liaoning calcium-base bentonite powder, 150g urea powder and the 60g NaF powder of 45 μ m (less than 325 orders) water content 12.0%, put into baking oven, constant temperature 2h between 90～120 ℃, obtaining high-expansion can sodium bentonite.Expand doubly and colloid index according to wilkinite method for testing performance (JC/T 593-1995) detection, the result is: times 73mL/g that expands, colloid index 500mL/15g.
Embodiment 10:
After 2kg mixed less than Liaoning calcium-base bentonite powder, 100g urea powder and the 60g NaF powder of 45 μ m (less than 325 orders) water content 12.0%, put into baking oven, constant temperature 3h between 90～120 ℃, obtaining high-expansion can sodium bentonite.Expand doubly and colloid index according to wilkinite method for testing performance (JC/T 593-1995) detection, the result is: times 95mL/g that expands, colloid index 500mL/15g.Utilize X-ray diffraction analysis (XRD) to detect and handle the front and back bentonitic structural changes in Liaoning.Liaoning calcium-base bentonite former state is seen accompanying drawing 7, and the veil spacing d value of its montmorillonite (001) face is 1.53nm; The XRD analysis of the high-expansion energy sodium bentonite after present method is handled is seen accompanying drawing 8, and the veil spacing d value of its montmorillonite (001) face reduces to 1.20nm.
Bentonitic expansion doubly, colloid index and d
001Face changes before and after handling
| Sample | Granularity (order) | Moisture (%) | Urea (%) | Sodium salt (%) | Doubly (mL/g) expands | Colloid index (mL/15g) | d 001(nm) |
| Anji, Zhejiang calcium-base bentonite former state | 325 | 11.5 | 0 | 0 | 16 | 100 | 1.50 |
| Prior art Comparative Examples 1 | 325 | 11.5 | 0 | 4 | 24 | 153 | - |
| Prior art Comparative Examples 2 | 325 | 11.5 | 10 | 0 | 17 | 99 | - |
| | 325 | 11.5 | 10 | 2 | 41 | 500 | - |
| Embodiment 2 | 325 | 11.5 | 10 | 3 | 56 | 500 | 1.30 |
| Embodiment 3 | 325 | 11.5 | 5 | 4 | 80 | 500 | 1.25 |
| Embodiment 4 | 325 | 11.5 | 10 | 4 | 93 | 500 | 1.27 |
| Embodiment 5 | 325 | 8 | 5 | 4 | 69 | 500 | - |
| Embodiment 6 | 200 | 11.5 | 5 | 4 | 50 | 500 | - |
| Embodiment 7 | 325 | 11.5 | 20 | 4 | 94 | 500 | 1.61 |
| Embodiment 8 | 325 | 11.5 | 10 | 4 | 92 | 500 | 1.20 |
| Liaoning calcium-base bentonite former state | 325 | 12 | 0 | 0 | 15 | 98 | 1.53 |
| Embodiment 9 | 325 | 12 | 5 | 2 | 73 | 500 | - |
| Embodiment 10 | 325 | 12 | 5 | 3 | 95 | 500 | 1.20 |
Claims (9)
1, a kind of process for preparing bentonite based sodium with high expension performance by drying method is characterized in that wilkinite powder and sodium salt powder and urea powder evenly mixedly, is heated to 85～120 ℃, constant temperature 0.5～5 hour, and obtaining high-expansion can sodium bentonite; The add-on of described sodium salt powder and urea powder is respectively 2%～6% and 2%～30% of wilkinite powder weight percent.
2, by the described process for preparing bentonite based sodium with high expension performance by drying method of claim 1, it is characterized in that described sodium salt is a yellow soda ash, any of Sodium Fluoride or its mixture.
3, by the described process for preparing bentonite based sodium with high expension performance by drying method of claim 1, the add-on that it is characterized in that described urea powder is 2%～20% of a wilkinite powder weight percent.
4, by the described process for preparing bentonite based sodium with high expension performance by drying method of claim 1, it is characterized in that described wilkinite powder is calcium base or calcium sodium base, sodium calcium base, sodium bentonite.
5, by claim 1 or 4 described process for preparing bentonite based sodium with high expension performance by drying method, the moisture content that it is characterized in that described wilkinite powder is 5～20%, and particle diameter is less than 80 μ m.
6, by claim 1 or 4 described process for preparing bentonite based sodium with high expension performance by drying method, the particle diameter that it is characterized in that described wilkinite powder is less than 45 μ m.
7, by the described process for preparing bentonite based sodium with high expension performance by drying method of claim 1, it is characterized in that described Heating temperature is 85～100 ℃.
8,, it is characterized in that the expansion of described high-expansion energy sodium bentonite doubly is 40～95mL/g by the described process for preparing bentonite based sodium with high expension performance by drying method of claim 1.
9, by claim 1 or 7 described process for preparing bentonite based sodium with high expension performance by drying method, it is characterized in that described heating installation is Hybrid Heating equipment or baking oven.
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| CN1126700A (en) * | 1995-01-13 | 1996-07-17 | 李为民 | Water process for refining sodium-base bentone and its product |
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