CN1356176A - Process for preparing slurry with wide granularities distribution by parallel grinders and substrate reflux - Google Patents
Process for preparing slurry with wide granularities distribution by parallel grinders and substrate reflux Download PDFInfo
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- CN1356176A CN1356176A CN 01138062 CN01138062A CN1356176A CN 1356176 A CN1356176 A CN 1356176A CN 01138062 CN01138062 CN 01138062 CN 01138062 A CN01138062 A CN 01138062A CN 1356176 A CN1356176 A CN 1356176A
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Abstract
A process for preparing slurry with wide range of granularities by parallel grinder and substrate reflux includes precrushing the raw solid material, proportionally mixing it with water and disperser, grinding in two grinders, mixing their output slurry, filtering, returning the 20 wt% of the slurry back to the said grinders, grinding them with new raw material, and filtering. Its advantages include wide granularity distribution, and high concentration stability.
Description
One, affiliated technical field
The present invention relates to a kind of preparation method of slurry, particularly a kind of method for preparing wide grain-size distributed slurry body with the grinding machine parallel grinders and substrate reflux.
Two, background technology
Along with slurry extensive use in a lot of fields, how to prepare the attention that high stability, high density slurry have more and more caused people.Wet milling is to prepare the commonly used and simple and direct method of slurry.For concentration and the stability that improves slurry, draw ratio, grinding mill barrel compartment, the adjustment mill of taking to adjust grinding machine usually is situated between (substituting part steel ball etc. as size and ratio, the use steel section of adjusting the ball mill ball size) or the methods such as feeding granularity of adjustment grinding machine realize.But thereby these measures all exist and are difficult to the wide distribution of prepared sizes and realize the high concentration of slurry and the problem of high stability simultaneously.Chinese patent application 87101648 has proposed a kind of method for preparing the stabilisation water-coal-slurry.This method is to add in the finished product water-coal-slurry and can generate water-fast alkali silicate or carbonate with calcium, magnesium ion, the concentration that is dissolved in calcium, magnesium ion in the liquid of slurry upper strata by continuous or interrupted detection is controlled its addition, guarantee that its addition is enough to these ions are changed into water-fast compound, thereby make coal slurry stable and never degenerate in storage period.Though this method has certain effect to improving stability of coal slurry, because the grating situation not radical change as yet of solids in the slurry, so can not improve slurry concentration simultaneously.Chinese patent application 85100543, propose to use humate or its sulfonate derivatives that the peat composed of rotten mosses, weathered coal or brown coal produced, can be used as the preparation solids content is the above slurries additive agent of 55wt%, uses or mix use with other additives all to obtain certain reduction viscosity and stablizing effect.Though this method has certain effect to improving slurry concentration, because the adding of additive causes the corresponding minimizing of contact point between the particle in the slurry, so can't solve the problem of the stability of slurry.
Though above technical scheme respectively the concentration that improves slurry and stable aspect obtained some progress, but still there are not at present the high concentration that solves slurry simultaneously and the method for high stability, how to overcome the problem that prior art exists, become one of difficult problem that needs to be resolved hurrily in the current slurry field.
Three, summary of the invention
The objective of the invention is to be to provide a kind of and prepare the method for wide grain-size distributed slurry body, by particle size distribution width in the slurry body with wide, to reach the concentration that improves slurry simultaneously and the effect of stability with the grinding machine parallel grinders and substrate reflux.
What propose according to the present invention prepares the method for wide grain-size distributed slurry body with the grinding machine parallel grinders and substrate reflux, it is characterized in that at first the solid material behind the precrushing and water and dispersant are placed two grinding machine ore grindings respectively, the solid of regulating two grinding machines mass percent example that feeds intake is 20: 80 to 40: 60, to make slurry and enter the blending tank mixing, filter through pulp filter again, to contain coarse granule is back to respectively in two grinding machines through the pulp filter bottom valve at interior 20wt% slurry, with new charged material ore grinding together, the slurry that makes after pulp filter filters is a wide grain-size distributed slurry body.This is because in grinding process, and mill is situated between three kinds of motion modes in grinding machine, cast and decline movement, rushes down motion and circular motion, and wherein cast and decline movement works the effect of smashing, and crumbling method is mainly used in and smashes coarse granule based on volumetric fracture; Rush down motion and play abrasive action, crumbling method is based on surface failure of rock, and main effect produces fine grained; Circular motion because mill is situated between and the grinding machine inwall does not produce relative motion, does not have effect to ore grinding.Grinding machine grinds high density slurry and divides two stages: the phase I, coarse grained pulverizing, the cast and decline movement that mill is situated between with the speed of solid particle fragmentation greater than the speed of grinding, produce the bigger particle of particle diameter, be filled between the bulky grain owing to lack granule, the system flowability is bad, has reduced the cast and decline movement of mill Jie in grinding machine and has rushed down motion, increase the circular motion that mill is situated between, made grinding efficiency reduce; Second stage, solid particle is through the abundant fragmentation of phase I, and the flowability of system increases gradually, and the motion of rushing down that mill is situated between also strengthens gradually, has produced and can satisfy the fine grained that grating requires, and helps making mobile and the satisfactory slurry of viscosity.A slurry part that makes refluxes and participates in ore grinding, has improved the initial flow of slurry, has shortened the time of phase I, has widened the material size distribution; And by regulating the load of grinding machine in parallel, make the slurry particles particle diameter of preparation distribute wideer, deposition efficiency is higher, helps improving the concentration and the stability of slurry more.The width of particle size distribution can calculate according to following formula in the slurry of the present invention:
In the formula, δ is the width of particle size distribution; D
nIt is the particle diameter of n grade; D
υVolume average particle size for particle; C
nIt is the percentage composition of n particle.The δ value is big more, and the bulk density of particle is just high more in the slurry, and the bulk density of particle is high more, has improved the deposition efficiency of powder in the slurry on the one hand; Increased interaction force and contact point between powder particle on the other hand, the concentration of slurry and stability are just high more.
The present invention compared with prior art beneficial effect is: the backflow of (1) bed material has remedied fine grain deficiency of ore grinding incipient stage, make the ore pulp of ore grinding incipient stage just have certain fluidity, help grinding the cast and decline movement of Jie in grinding machine and rush down motion, thereby improved the grinding efficiency of grinding machine; (2) by regulating the load of grinding machine in parallel, make the slurry particles particle diameter of preparation distribute wideer, deposition efficiency is higher, is more conducive to reach simultaneously the concentration that improves slurry and the purpose of stability; (3) different with the coarse granule of abandoning in the pulp filter in the past, grinding machine underflow circumfluence method can make originally wanted the coarse granule of elimination to turn back to grinding machine with the part slurry, recycled, and reached aim of saving, and the present invention has application value widely.
Four, description of drawings
Accompanying drawing is the process flow diagram that the present invention's grinding machine part in parallel base material reflux prepares wide grain-size distributed slurry body.
Five, embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Embodiment 1. prepares the method for the prosperous village of wide size distribution 2# cleaned coal water-coal-slurry with grinding machine parallel grinders and substrate reflux method.
Grinding machine pan feeding mass percent example with two grinding machines is 20: 80 to 40: 60, the capacity of returns of bed material is 20wt%, make the water-coal-slurry of wide size distribution, with preparation 4.0kg/h output, the coal pan feeding mass percent of two grinding machines is that the water-coal-slurry of 40: 60 wide size distribution of preparation is an example: ball mill (1) adopts XMB-Ф 240 * 330 type ball mills, volume is 13.57L, mill load is 2.4kg/h, coal feeding amount is 1.75kg/h, dispersant NDF addition is 0.015kg/h (50wt%), the adding water yield is 0.635kg/h, XMB-Ф 240 * 330 type ball mills that ball mill (2) adopts, and volume is 13.57L, load is 1.6kg/h, coal feeding amount is 1.16kg/h, and dispersant NDF addition is 0.01kg/h (50wt%), and the adding water yield is 0.43kg/h, the slurry that earlier two table grinders is made mixes, and the flow that the control slurry is back to ball mill (1) and ball mill (2) is respectively 0.48kg/h, 0.32kg/h, make the water-coal-slurry of wide size distribution after the filtration, test its performance again.
The grinding machine pan feeding mass percent example of measuring no underflow ball mill (load is 2.0kg/h), two grinding machines in parallel respectively by enterprise mark Q/3201NBJ02-1999 is coal concentration, viscosity and the dynamic stability of water-coal-slurry of the high concentration high stability of 3 kinds of wide size distribution making in 20: 80,30: 70,40: 60, the coal particle diameter of measuring water-coal-slurry with laser particle analyzer distributes, by formula calculate the dispersion of distribution of particle, the results are shown in Table 1.As seen, the dispersion of distribution of using the present invention to make the particle of water-coal-slurry all has raising in various degree from table 1, and concentration and dynamic stability also improve with the increase of the dispersion of distribution, and two grinding machine pan feeding mass percent examples are that 30: 70 o'clock effects reach best.
The water-coal-slurry performance table of table 1 different process method preparation
| The preparation method | Coal concentration (wt%) | Apparent viscosity (mPaS) | The distribution of particles width | Average grain diameter (μ m) | 24 hours dynamic settling speed (wt%/h) | |
| The separate unit ball mill | ??67.5 | ????1020 | ?147.5 | ??26.0 | ????0.30 | |
| The grinding machine pan feeding mass percent example of two grinding machines | ??20∶80 | ??70.1 | ????1010 | ?231.0 | ??37.0 | ????0.04 |
| ??30∶70 | ??70.5 | ????1020 | ?256.0 | ??25.0 | ????0.02 | |
| ??40∶60 | ??69.7 | ????1030 | ?217.0 | ??24.5 | ????0.05 | |
Embodiment 2. prepares the method for the burnt slurry of wide size distribution Shandong petroleum coke water with grinding machine parallel grinders and substrate reflux method.
Grinding machine pan feeding mass percent example with two grinding machines is 20: 80 to 40: 60, the capacity of returns of bed material is 20wt%, make the burnt slurry of water of wide size distribution, with preparation 4.0kg/h output, the petroleum coke pan feeding mass percent of two grinding machines is that the burnt slurry of the water of 40: 60 wide size distribution of preparation is example: ball mill (1) adopts XMB-Ф 240 * 330 type ball mills, volume is 13.57L, mill load is 2.4kg/h, lapidation oil coke amount is 1.8kg/h, dispersant NDF addition is 0.015kg/h (50wt%), the adding water yield is 0.585kg/h, XMB-Ф 240 * 330 type ball mills that ball mill (2) adopts, volume is 13.57L, load is 1.6kg/h, throw burnt amount and be 1.2kg/h, dispersant NDF addition is 0.01kg/h (50wt%), the adding water yield is 0.39kg/h, the slurry that earlier two table grinders is made mixes, and the flow that the control slurry is back to ball mill (1) and ball mill (2) is respectively 0.48kg/h, 0.32kg/h, make the burnt slurry of water of wide size distribution after the filtration, test its performance again.
The grinding machine pan feeding mass percent example of measuring no underflow ball mill (load is 2.0kg/h), two grinding machines in parallel respectively with reference to enterprise mark Q/3201NBJ02-1999 is burnt burnt concentration, viscosity and the dynamic stability of starching of water of the high concentration high stability of 3 kinds of wide size distribution making in 20: 80,30: 70,40: 60, the burnt particle diameter of measuring the burnt slurry of water with laser particle analyzer distributes, by formula calculate the dispersion of distribution of particle, the results are shown in Table 2.From table 2 as seen, the dispersion of distribution of using the present invention to make the particle of the burnt slurry of water all has raising in various degree, the concentration and the dynamic stability of the burnt slurry of water also improve with the increase of the dispersion of distribution, and two grinding machine pan feeding mass percent examples are that 30: 70 o'clock effects reach best.
The burnt slurry of the water performance table of table 2 different process method preparation
| The preparation method | Coal concentration (wt%) | Apparent viscosity (mPaS) | The distribution of particles width | Average grain diameter (μ m) | 24 hours dynamic settling speed (wt%/h) | |
| The separate unit ball mill | ??72.0 | ??1010 | ??153.7 | ??31.0 | ????0.30 | |
| The grinding machine pan feeding mass percent example of two grinding machines | ?20∶80 | ??74.9 | ??990 | ??238.6 | ??26.1 | ????0.06 |
| ?30∶70 | ??75.5 | ??1020 | ??261.7 | ??24.5 | ????0.03 | |
| ?40∶60 | ??74.8 | ??1030 | ??223.1 | ??25.7 | ????0.06 | |
Claims (2)
1, a kind of method for preparing wide grain-size distributed slurry body with the grinding machine parallel grinders and substrate reflux, it is characterized in that at first the solid material behind the precrushing and water and dispersant are placed two grinding machine ore grindings respectively, the solid of two grinding machines mass percent example that feeds intake is 20: 80 to 40: 60, the slurry of gained enters blending tank to be mixed, filter through pulp filter again, to contain coarse granule is back to respectively in two grinding machines through the pulp filter bottom valve at interior 20wt% slurry, with new charged material ore grinding together, the slurry that makes after pulp filter filters is a wide grain-size distributed slurry body.
2, according to claim 1ly prepare the method for wide grain-size distributed slurry body with the grinding machine parallel grinders and substrate reflux, the solid that it is characterized in that two grinding machines mass percent example that feeds intake is 30: 70.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011380624A CN1174809C (en) | 2001-12-30 | 2001-12-30 | Process for preparing slurry with wide granularities distribution by parallel grinders and substrate reflux |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011380624A CN1174809C (en) | 2001-12-30 | 2001-12-30 | Process for preparing slurry with wide granularities distribution by parallel grinders and substrate reflux |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1356176A true CN1356176A (en) | 2002-07-03 |
| CN1174809C CN1174809C (en) | 2004-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011380624A Expired - Fee Related CN1174809C (en) | 2001-12-30 | 2001-12-30 | Process for preparing slurry with wide granularities distribution by parallel grinders and substrate reflux |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110699131A (en) * | 2019-10-24 | 2020-01-17 | 中煤科工清洁能源股份有限公司 | Preparation method of blended coal-water coal slurry |
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2001
- 2001-12-30 CN CNB011380624A patent/CN1174809C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110699131A (en) * | 2019-10-24 | 2020-01-17 | 中煤科工清洁能源股份有限公司 | Preparation method of blended coal-water coal slurry |
| CN110699131B (en) * | 2019-10-24 | 2021-11-05 | 中煤科工清洁能源股份有限公司 | Preparation method of blended coal-water coal slurry |
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| Publication number | Publication date |
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| CN1174809C (en) | 2004-11-10 |
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