Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
  • G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
  • G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture

Definitions

• the present invention relates to a method for measuring the properties of a solution, and in particular, the solids content in a solution which contains solid particles, and for measuring viscosity and air content.
• the solution to be measured is lead into the space of the measuring mechanism, in which the pressure is regulated by a pressure control device, the density of the solution substance is measured with a densimeter, the predominant pressure is altered within the space using the pressure control device and the solution's density is measured again, at least one more time, whereupon the solids content in the solution is calculated from the densimeter and the air content is calculated from at least two different density evaluations.
• the precise determination of the solids content in solutions containing solid particles, such as mineral sludge, pastes and other corresponding solutions, is an important factor in determining the properties of the solution, how the solution should be treated, and/or different processes in which it is used.
• the solids content is generally measured with a conventional radiation-based densimeter. The results of the measurements are, however, imprecise because the air content in the solution varies due to the passage of time and different occurrences. At present, sufficient consideration is not given to these alterations in air content while measurements are being taken.
• the present invention seeks to provide a method by which both the solids content of a solution containing solid particles and the air content in the same solution can be measured, and by using this method, the invention seeks to eliminate the disadvantages associated with the present method.
• the invention seeks to provide a method, which is to be used for supervising the cycle, which, when used, yields property measurements for the processed solution simply and reliably, and which can be adapted to different purposes.
• a measuring mechanism in accordance with a method carried out in accordance with the invention is linked to the cycle or corresponding system, with an interface.
• the solution going through the cycle is lead to the measuring mechanism and the solids content and air content of the solution is measured at the desired intervals.
• the solution is lead from the measuring mechanism through the capillary or slit pipe back to the cycle.
• the difference in flow and pressure is measured within the measuring mechanism and also after the capillary/slit pipe, and then the viscosity of the solution is calculated/determined.
• the properties and alterations in the properties of the solution which is going through the cycle can be continuously followed, or followed at certain intervals.
• a method in accordance with the invention yields reliable and precise measurements of the solids content in a solution containing particles, and of the solution's viscosity and air content as it is going through a cycle or corresponding system.
• the method is suitable for measuring the solids content and air content of all sorts of solutions containing solid particles.
• the method is especially suited for use in measuring the properties of mineral sludge and pastes, such as coating slip.
• the method can be adapted for use in both industrial cycles and laboratories.
• a mechanism is connected to the sample tank with an interface and the solution inside the tank is lead to the measuring mechanism where the solids content, viscosity and air content of the solution is measured.
• the embodiment is intended for use in a laboratory and functions reliably for that purpose.
• a measuring mechanism formed in accordance with the figure 2 comprises a pressure control device 4, the space within the measuring mechanism 3 or tank, a densimeter 1 and an interface 6.
• a radioactive source in one half of the space and a detector in the other half.
• a pressure sensor 8 is located in the space 3 in order to measure the predominant pressure.
• a capillary 7 or slit pipe is incorporated into the space.
• the space is formed as a pipe and the pipe is shaped as a letter "s", whereupon the range of the detector and source of radiation can always be adjusted to the optimum setting to obtain a case-specific sample.
• the mechanism When using a measuring mechanism formed in accordance with the figure, the mechanism is connected, for example, to the sludge cycle or paper machine paste cycle.
• the substance is lead through the interface 6 to the pressure control device 4 and from there to the space or pipe 3.
• This pipe functions as a solids content and air content unit.
• the density of the sample is measured with the densimeter 1.
• the pressure inside the solids and air content unit is raised to the desired value, for example, 50 bars, with the help of the pressure set by the pressure input unit and the same density measurement is taken again.
• the air is pressed to one fiftieth of its former volume and the solids content can be calculated directly from the density. Air content is easily and reliably calculated from these two density measurements. If desired, other measurements can also be taken at other pressures, and the quantity of measurements taken and/or the pressures at which they are taken vary depending on the different embodiments of the invention.
• the air content of the solution can surely and reliably be determined and thus taken into consideration.
• the effect of the air is minimized in the results of the measurements.
• the solution or corresponding substance can be pressed through the capillary 7 or slit pipe back into the cycle.
• the solution is lead from the measuring mechanism through the capillary back into the cycle, it does not need to be lead elsewhere first or treated separately.
• the invention is not limited to the advantageous embodiment set forth in this patent application.
• the invention is versatile and its form can vary within the frame of the idea of the invention put forth in the claims.

Landscapes

• Physics & Mathematics (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• General Physics & Mathematics (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Sampling And Sample Adjustment (AREA)
• Analysing Materials By The Use Of Radiation (AREA)

Applications Claiming Priority (3)

Publications (1)

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Cited By (1)

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• 1998
  • 1998-03-20 FI FI980635A patent/FI104288B1/fi not_active IP Right Cessation
• 1999
  • 1999-03-18 EP EP99908989A patent/EP1062492A1/en not_active Withdrawn
  • 1999-03-18 WO PCT/FI1999/000211 patent/WO1999049296A1/en not_active Application Discontinuation
  • 1999-03-18 AU AU28388/99A patent/AU2838899A/en not_active Abandoned

Non-Patent Citations (1)

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