Method and device for producing artificial crushed sand by means of a thermal treatment using sand in the form of fine sand (fS/FSa) and/or round sand as the starting material

A material, round sand technology, applied in grain processing, mineral processing, pretreatment control, etc., to reduce the risk of natural disasters, reduce the increase, and slow down the expansion of the desert

CN106414360AActive Publication Date: 2017-02-15BLACK RAMEL LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-02-15

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Abstract

The invention relates to a method for producing artificial crushed sand by means of a thermal treatment using sand in the form of fine sand (FS / FSa) and / or round sand as the starting material (1). The starting material (1) in variant A is heated to a melting temperature by bundling sun rays (13), and / or the starting material in variant B is heated to a melting temperature by using a conventional melting device which achieves its energy supply using converted or stored solar power, whereby each of a plurality of sand grains are melted together into a three-dimensional intermediate product (2). The intermediate product (2) produced in this manner is cooled and finally comminuted to a particle size of less than 2 mm in a comminuting process. An end product (3) is produced which differs from the starting material (1) with respect to the shape and surface roughness. The method offers a long-term solution for meeting the demand for crushed sand and provides sand for the construction industry.
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Description

technical field

[0001] The present invention relates to a method and a device for producing artificially broken sand or crushed sand by heat treatment using sand in the form of fine sand (fS / FSa) and / or round sand as starting material. Background technique

[0002] By definition, the name sand is used for all unsolidified rock deposits consisting of individual mineral grains ranging in size from 0.063mm to 2mm. According to DIN 4022, various types of sand are distinguished according to their grain size, surface and shape. Depending on the particle size distribution, sand is classified as fine sand (fS / FSa), medium sand (mS / MSa) or coarse sand (gS / CSa). Further subdivisions of sand are specified by the terms "circular sand" and "angular sand". Round sand mainly includes round components. They are mainly found in desert regions and mainly in the fine sand (fS / FSa) particle size range. Angular sand is further subdivided into naturally occurring broken sand and artificially ...

Examples

Embodiment Construction

[0040] figure 1 A possible device for carrying out a preferred embodiment of the method according to the invention is shown. In this case, desert sand as a starting material 1 is placed through a storage container 6 (eg, funnel-shaped) on a coarse screen 7 to remove the coarsest impurities from the starting material 1 . After the screening process, the screened starting material 1 is transferred directly to a suitable conveyor belt 8 as support surface. The conveyor belt is provided with a release sheet 9 to produce a uniform layer with a controllable layer thickness. Optionally, the flatness of the material layer can be improved by vibrating belts. The homogeneous sand layer goes further via the conveyor belt 8 to the level of heat treatment, melting the starting material 1 as it is guided past the immediate region of the focal point 10 of the device 5 for concentrating the sun's rays, such as a plano-convex converging lens. The larger the area of ​​the means 5 for concen...