A dry method for producing limestone machine-made sand

Abstract

The invention discloses a method for producing limestone machine-made sand through a dry method. The method comprises the following steps of conducting broken stone stacking, terrace feeding, conveying, crushing and sieving and wet stirring to obtain a finished product, wherein high-temperature drying treatment is conducted in the conveying process. Conveying equipment is provided with an electricheating assembly. A screw conveyor serves as the conveying equipment. The conveying equipment comprises a conveyor shell and a screw rod driven to rotate in the conveyor shell by a motor. One end ofthe conveyor shell is provided with a feed port, and the other end of the conveyor shell is provided with a discharge port. An electric heating wire is embedded in the inner wall of the conveyor shell.

Description

technical field [0001] The invention relates to the technical field of dry sand making, in particular to a method for dry producing limestone machine-made sand. Background technique [0002] With the further development of my country's economic construction, the output of concrete is increasing, which leads to a sharp increase in the demand for natural sand as a raw material for concrete. Due to the scarcity of natural sand in some areas, machine-made sand is more and more widely used in various concrete projects. Machine-made sand is sand suitable for construction by crushing mountain rocks into a particle size of ≤5mm. Compared with natural sand, the particle characteristics of machine-made sand are rough surface, many edges and corners, and coarse particles. [0003] In the existing technology, the production of machine-made sand mainly has the following defects: (1) The sand produced by mainstream sand-making machinery has serious problems in grain shape, size, and sha...

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Problems solved by technology

[0003] In the existing technology, the production of machine-made sand mainly has the following defects: (1) The sand produced by mainstream sand-making machinery has serious problems in grain shape, size, and shape, and there are coarse grain size, many needles, and powder Several fatal problems of multiple and poor gradation

(2) There are also some manufacturers that can achieve relatively stable particle gradation, and the fineness modulus of machine-made sand is 2.4~3.2, but most of them show that there are more at the two ends and less in the middle, that is, there are more large particles and fine particles, and the middle particles are lacking.

In fact, due to the influence of raw material storage, batch preservation, storage, weather and other reasons, in production, the moisture content of raw materials is often uncontrollable

In addition, in the dry sand making process, the weight of the finished sand produced per hour is constantly changing, which will have a more complicated impact on the moisture content control of the machine-made sand.

[0004] The document "Building Materials" discloses the research on water content control technology of machine-made sand in dry sand making process and discloses a method for online control of water content in machine-made sand, mainly through sensors and control software systems to monitor water content, but generally used The obtained sensor has relatively high environmental requirements and relatively high cost

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