Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N1/00—Sampling; Preparing specimens for investigation
  • G01N1/02—Devices for withdrawing samples
  • G01N1/22—Devices for withdrawing samples in the gaseous state
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/24—Earth materials
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N1/00—Sampling; Preparing specimens for investigation
  • G01N1/02—Devices for withdrawing samples
  • G01N1/10—Devices for withdrawing samples in the liquid or fluent state
  • G01N2001/1006—Dispersed solids
  • G01N2001/1012—Suspensions
  • G01N2001/1018—Gas suspensions; Fluidised beds

Definitions

• the invention relates to a method and a device for determining the magnetite and phosphorus content of magnetite-containing ores.
• the new process can be used for mining or processing ores.
• the raw material composition When mineral raw materials are mined, the raw material composition must be constantly checked. For. On the one hand, the proportion of pigeon rock or useful rock is determined, on the other hand, it is often necessary to keep certain disruptive additions under control. Usually Quantities of the raw material are sampled using a shovel or other gripping tools. The sample quantity is then prepared for the actual chemical analysis, for example ground and homogenized. The analysis must be carried out in such a short time that, depending on the analysis result, it is possible to intervene in the further transport or in the further processing of the materials.
• the object of the invention is to develop a device and a method with which representative samples of the material to be analyzed and sorted can be taken in rapid succession and analyzed for magnetite and phosphorus content in a sufficiently short time.
• a sample is to be taken from each blade during ore mining in the manner described above and analyzed so quickly that the blade contents can be passed into the shaft provided for this composition or for this quality without waiting.
• a dust collecting part is used according to the invention, the special construction of which particularly combines the following features:
• the dust collecting part is designed as an eg cylindrical suction device with a lateral suction nozzle.
• the dust process is first through a pre-filter with a mesh width of eg 100 / um sucked.
• the interior of the device is provided with a coaxial sieve insert or a filter gauze.
• the length and diameter of the hollow cylinder delimited by the filter insert is matched to the mesh size of the filter insert so that all particles larger than the mesh size of the filter reach the container for collecting the dust, because they are not braked sufficiently due to their inertial forces and be redirected. The smaller particles, however, are sucked out through the mesh of the sieve or filter insert.
• the suction device is provided at the front with a nozzle-like constriction, as a result of which the dust particles sucked in by the pre-filter are accelerated so strongly that the larger particles do not follow the deflection of the air flow achieved by the lateral suction.
• the device for analyzing the dust for magnetite or phosphorus content consists essentially of two main components: a magnet coil unit for determining the magnetite content and the total amount of samples and a device for wet chemical analysis of phosphorus.
• An elongated container is provided in the magnetic coil unit and is used to hold the sample material to be analyzed. This container is surrounded by a coil layer. If the coil arrangement is applied to an alternating voltage, ent there is a magnetic field inside the coil.
• the magnetic flux or the relative permeability of the core is changed depending on the magnetite content of the sample. From this change, both the level or the total amount of the sample and the magnetite content of the sample can be determined.
• the coil When using two coaxially arranged coils, the coil, whose length is less than the minimum fill level of the container, is used to measure the magnetite content and the second coil, whose length is greater than the maximum fill level of the container, serves to measure the total sample quantity.
• the coil arrangement consists of three coils, one coil is used as the primary coil. Their length is greater than the maximum fill level of the column containing the sample.
• the secondary voltage U 1 is a function of the magnetite content of the dust sample. From the ratio of the scans U 2 / U 1 , the
• the dust sample the mass of which has been determined by the magnet coil arrangement, is analyzed for phosphorus.
• the phosphorus content is measured photometrically in a manner known per se, the sample being reacted with a molybdate / vanadate reagent.
• the reagent-acid combination must be dosed exactly.
• water is added for dilution in an analogous manner.
• the reagent liquid or water is introduced into the reaction chamber by means of a special arrangement of storage containers and dosing chambers and valves.
• the advantages achieved by the invention can be seen essentially in the fact that sufficiently large amounts of dust for the. Analysis can be provided. It also enables different amounts of dust to be measured precisely, which is the prerequisite for phosphorus analysis. Furthermore, the device can be mounted on a loader and withstands the high loads which arise during the loading process.
• the wet chemical analysis system for phosphorus is designed so that apart from some solenoid valves there are no moving parts, so that it meets the requirements for a vibration-insensitive and simple. Analyzer equivalent. Both the magnetite content determination and the phosphorus determination can be carried out in a very short time of less than 60 seconds. For special applications, the electronic components of the device can also be accommodated outside the device body without the function being impaired.
• Figure 1 shows the structure of the overall device
• FIG. 3 shows a possible form of dust generation
• Figure 4 shows the structure of the analysis device for phosphorus.
• the dust collecting part 1 is connected to an elongated container 3 via a line 2.
• container 3 is surrounded by two coils 4 and 5, which are fed by an alternating current source 6.
• Grain sizes in the range from 100 to 15 / um, preferably an average mass diameter of 6 5 / um, can be dried at about 100 ° C. by providing a heater (not shown here) on line 2 and / or container 3.
• the lengths of the coils 4 and 5 are matched to the filling height of the container 3 in such a way that the coil 4 is shorter, but the coil 5 is longer than the dust column.
• the exact measurement of the fill level can then be carried out by the coil 5, while the coil 4 is used to determine the magnetite content.
• the total mass of the sample can be calculated from the measured values of the coils 4 and 5.
• the slide 7 is opened and the sample falls into the reaction vessel 3.
• the reaction of the phosphor with acidic molybdate / vanadate reagent required for the photometric analysis is at about 90 ° C initiated.
• the acid / reagent combination and the water for dilution are metered using storage containers 10, 11, metering chambers 12, 13 and valves 14 to 18.
• Hollow cylinder is matched to the mesh size of the filter gauze so that all particles that are larger than the mesh size reach the curved line 2 because they are not braked and deflected sufficiently due to their inertia. The smaller particles, however, are through the mesh of the
• Filter gauze 26 sucked.
• the result of this is that the filter gauze 26 is only slightly contaminated and therefore has a long service life. Dust particles that reach the curved line 2 no longer contain any fines.
• the sample material obtained is therefore free-flowing and falls into the measuring container 3 via the funnel insert 27.
• This process can be supported by a vibrator (not shown here). In general, however, such a measure is not required because sufficient vibration due to the use of the entire device, e.g. Installation on a loader is given.
• the funnel 27 and the measuring container 3 can also be attached directly to the housing of the suction device 1 without the curved line 2.
• FIG 3 is shown schematically.
• Device for dust generation shown. It consists essentially of a motor-operated ring steel brush 28 and can be attached in front of the dust collecting part 1 so that the particles can be caught by the dust collecting part.
• Another possibility for the artificial generation of dust consists, for example, in the use of compressed air. With the help of compressed air, which is introduced via the valve 19, there is a strong swirling of the liquid medium with the dust and leads to the rapid dissolution of the phosphorus-containing component. If the phosphorus compound is present, for example, in the form of apatite, the reaction with an optimal composition of the acid / reagent combination takes 30 seconds. completed. Then the solution is passed through the filter 20 into a flow cell with a photometer unit 21. The measured value is evaluated by a microcomputer 22, which can simultaneously take over the sequence control of the system.
• the Funkticnsprir.zip of the dust collecting part according to the invention can be seen from FIG.
• the suction takes place through the prefilter 23, which can have a mesh size of approximately 100 ⁇ m.
• the conical taper 24 of the suction device located on the front part causes a strong acceleration of the dust particles.
• the air is sucked out through the side suction port 25.
• the suction device is provided on the inside with a coaxially arranged sieve insert or filter gauze 26. Due to its flow resistance, this sieve insert ensures a uniform pressure distribution in the suction device 1.
• valve 16 Closing the valve 16, the valve 17 is opened and shortly thereafter the valve 30 and liquid is transported into the reaction chamber 8. Stirring is then carried out with the compressed air flowing in via the valve 19, metering chamber 13 and valve 17. The water is metered in in an analogous manner by actuating the valves 14, 15, 31 and 32 from the storage vessel 10 to the metering chamber 12 and the reaction vessel 8.
• reaction chamber 8 After closing the valve 19, the reaction chamber 8 is under Set excess pressure and the liquid is filtered out of the reaction chamber 8 for subsequent photometric measurement through the filter 20.

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• Life Sciences & Earth Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• General Physics & Mathematics (AREA)
• Immunology (AREA)
• Physics & Mathematics (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• Pathology (AREA)
• Environmental & Geological Engineering (AREA)
• Biomedical Technology (AREA)
• Molecular Biology (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• Remote Sensing (AREA)
• Food Science & Technology (AREA)
• Medicinal Chemistry (AREA)
• Sampling And Sample Adjustment (AREA)
• Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
• Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Priority Applications (3)

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Publications (1)

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ID=6092370

Family Applications (1)

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Cited By (2)

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Citations (6)

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• 1980
  • 1980-01-18 DE DE19803001704 patent/DE3001704A1/de not_active Ceased
• 1981
  • 1981-01-10 JP JP56500371A patent/JPH0318147B2/ja not_active Expired - Lifetime
  • 1981-01-10 AU AU66482/81A patent/AU543222B2/en not_active Ceased
  • 1981-01-10 WO PCT/EP1981/000001 patent/WO1981002065A1/de not_active Ceased
  • 1981-01-10 DE DE8181900221T patent/DE3167882D1/de not_active Expired
  • 1981-01-10 BR BR8106030A patent/BR8106030A/pt not_active IP Right Cessation
  • 1981-01-10 EP EP81900221A patent/EP0043826B1/de not_active Expired
  • 1981-01-15 US US06/225,199 patent/US4482864A/en not_active Expired - Fee Related
  • 1981-01-16 CA CA000368715A patent/CA1180385A/en not_active Expired
• 1982
  • 1982-12-21 US US06/451,948 patent/US4502951A/en not_active Expired - Fee Related

Patent Citations (6)

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