Continuous process mixing of pulverized solids and liquids and mixing apparatus
First Claim
1. A continuous process for mixing pulverized solids and liquids such as plaster powder and water characterized in that it comprises:
- continuously introducing the liquid in a mixing container at a selected flow rate,continuously introducing the pulverized solid in said container at a selected flow rate,said flow rates being selected to provide a desired proportion of solid and liquid,rotating the solid and liquid in the container in order to create a vortex thereof,withdrawing the thus mixed solid and liquid from the container and controlling the rate of withdrawing such that a desired level of the mixture in the container is maintained, the mean stay time for the mixture in the mixing container being determined by the said level of the mixture in the container.
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Abstract
The invention deals with continuous process mixing of pulverized solids and liquids. It offers a mixing process comprising:
continuously introducing a liquid into a mixing container;
continuously introducing a solid powder into said container at such a rate that specified proportions of solid and liquid in the mixture are maintained;
rotating the products in the container in such a way as to establish a vortex;
regulating the solid and liquid supply rate in such a way that a given level of filling of container is constantly maintained;
continuously emptying the products mixture so that level of filling is maintained.
It offers as well a mechanism to implement the process including a mixing container having an intermediate bottom and a runoff opening, a turbine mounted above the intermediate bottom, and mechanism for supplying a liquid and a solid. Advantageously, the liquid is used to wash down the walls of the mixing container and may be applied to parts of the turbine to avoid retention of solids in the container. It can be applied to hydraulic binders preparations and specifically to continuous process preparation of a plaster and water mixture.
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Citations
48 Claims
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1. A continuous process for mixing pulverized solids and liquids such as plaster powder and water characterized in that it comprises:
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continuously introducing the liquid in a mixing container at a selected flow rate, continuously introducing the pulverized solid in said container at a selected flow rate, said flow rates being selected to provide a desired proportion of solid and liquid, rotating the solid and liquid in the container in order to create a vortex thereof, withdrawing the thus mixed solid and liquid from the container and controlling the rate of withdrawing such that a desired level of the mixture in the container is maintained, the mean stay time for the mixture in the mixing container being determined by the said level of the mixture in the container. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 29, 30, 31, 32, 33)
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2. A continuous process for mixing pulverized solids and liquids such as plaster powder and water characterized in that it comprises:
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continuously introducing the liquid in a mixing container at a selected flow rate, continuously introducing the pulverized solid in said container at a selected flow rate, said flow rates being selected to provide a desired proportion of solid and liquid, rotating the solid and liquid in the container in order to create a vortex thereof, and withdrawing the thus mixed solid and liquid from the container at a rate such that the desired level of the mixture in the container is maintained, said process being further characterized in that its starting period includes the following steps; introducing the liquid and solid into the mixing container in a weight ratio selected beforehand until a selected filling level of said mixing container is reached, rotating the liquid and solid in the container and maintaining the rotating motion for a selected time, and then, at the same time continuously introducing into the container liquid and solid at flow rates such that weight ratio of the mixture is maintained, and continuously withdrawing the mixture from the container at a flow rate that will maintain the filling level. - View Dependent Claims (3, 4)
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23. A vertical mixer, for pulverized solids and liquids characterized in that it comprises:
- a container formed by a hollow solid of revolution and equipped in its lower end with a run-off opening, run-off flow rate regulation means in communication with said run-off opening, said container having an intermediate bottom spaced from the interior of the side wall of the container, a turbine mounted inside of the container above the intermediate bottom and revolving around a vertical axis on the container'"'"'s axis, means for continuously supplying a liquid in the container and means for continuously supplying a pulverized solid to the container.
- View Dependent Claims (24, 25, 26, 27, 28, 34, 35, 36, 37)
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38. A vertical mixer for pulverized solids and liquids comprising:
- a container in the form of a vertical cylinder with a downward extension which tapers toward its lower end which has a run-off opening, a downwardly tapered core in the downward extension of the container providing for a ring-shaped space in cross-section between it and the container'"'"'s inner wall and its top providing an intermediate bottom at the level of the junction of the cylinder portion and tapered extension of the container, a turbine mounted inside of the container immediately above the intermediate bottom formed by the core, an ejection device in communication with the run-off opening for transforming the discharge from the run-off opening into a full stream, an elastic sleeve valve in communication with the ejection device and downstream thereof for run-off flow rate regulation, means for continuously supplying a liquid to the container including a ring-shaped pouring spout adjacent the top of the container and distributing liquid along the inside of the container'"'"'s side wall, a tube directed toward the shaft of the turbine to discharge liquid thereon, and valve means for regulating the rate of flow, and means for continuously supplying a pulverized solid to the container including a supply hopper for a pulverized solid, trap means for regulating flow from the hopper, a constant weight weight-sensitive conveyor belt upon which pulverized solid from the hopper is poured and whose unbalance results in a change of trap means position, and a flow rate regulating means for receiving pulverized solid carried by the weight-sensitive conveyor belt comprising a vibrating spout.
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39. A continuous process for mixing pulverized solids and liquids such as plaster powder and water characterized in that it comprises
continuously introducing liquid into a mixing container at a selected flow rate, continuously introducing pulverized solids into said container at a selected flow rate, said flow rates being selected to provide a desired proportion of solid and liquid, rotating the solids and liquid in the container to create a vortex thereof and a mixture of the solids and liquid, rotating the mixture through a ring-shaped space in the container in a spiral descent into a discharge opening, and continuously passing the mixture through the discharge opening.
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47. A continuous process for mixing pulverized solids and liquids such as plaster powder and water characterized in that it comprises
continuously introducing liquid into a mixing container at a selected flow rate, continuously introducing pulverized solids into said container at a selected flow rate, said flow rates being selected to provide a desired proportion of solid and liquid, rotating the solids and liquid in the container to create a vortex thereof and a mixture of the solids and liquid, rotating the mixture through a ring-shaped space in the container in a spiral descent into a discharge opening, and continuously passing the mixture through the discharge opening, said process including passing the mixture from the discharge opening into an ejection zone and rotating the mixture in the ejection zone, and discharging the mixture tangentially from the ejection zone into a collector pipe
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48. A continuous process for mixing pulverized solids and liquids such as plaster powder and water characterized in that it comprises
continuously introducing liquid into a mixing container at a selected flow rate, continuously introducing pulverized solids into said container at a selected flow rate, said flow rates being selected to provide a desired proportion of solid and liquid, rotating the solids and liquid in the container to create a vortex thereof and a mixture of the solids and liquid, rotating the mixture through a ring-shaped space in the container in a spiral descent into a discharge opening, and continuously passing the mixture through the discharge opening, said process including said ejection zone having an inverted cone shape, and revolving the mixture in ever widening circles in the ejection zone in a spiral descent to the discharge opening so that no uncontrolled vortex is likely to create a motionless zone where mass setting could occur.
Specification