Dry sand making process

Abstract

The invention discloses a dry sand making process, comprising the following procedures: crushing treatment, sieving treatment, coarse particle humidification treatment and standby dry sand treatment. The process integrates striking, milling and rocking by stones; meanwhile, stone-powder separation is achieved; kinetic energy required by a main engine is greatly reduced; the produced product is stable in grading, good in particle shape, and adjustable in fineness modulus; the overall process adopts a separation technique, so that energy conservation and environmental protection are achieved; the finished product is stable in grading, good in particle shape, and free of needle-like sand, and is a polyhedron, and is similar to a globoid shape; the fineness modulus (2.3-3.0) and the particle content (below 5%) are adjustable; all performance indexes accord with the 'standard of sand for construction' GB14684-2011; the processing cost per ton is saved by 60% in comparison with international and domestic similar products; the sand making cost is greatly reduced; and the crushing application range is wide.

Description

technical field [0001] The invention relates to a preparation process of building materials, in particular to a preparation process of concrete machine-made sand. Background technique [0002] At present, with the strengthening of environmental protection awareness, river sand resources are becoming more and more scarce, coupled with the low-level competition in China's concrete industry, and the quality is difficult to control. With the development of high-rise buildings, the requirements for high-performance concrete materials are also high. Dry mix Both the mortar industry and the asphalt pavement transportation industry need advanced production equipment to replace old equipment to produce high-quality machine-made sand. Traditional simple combination sand making machines include vertical sand making machines, impact crushers and impact crushers, although they can achieve crushing effects. , but the crushing system is single, and the whole system adopts a series connecti...

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Problems solved by technology

[0002] At present, with the strengthening of environmental protection awareness, river sand resources are becoming more and more scarce, coupled with the low-level competition in China's concrete industry, and the quality is difficult to control. With the development of high-rise buildings, the requirements for high-performance concrete materials are also high. Dry mix Both the mortar industry and the asphalt pavement transportation industry need advanced production equipment to replace old equipment to produce high-quality machine-made sand. Traditional simple combination sand making machines include vertical sand making machines, impact crushers and impact crushers, although they can achieve crushing effects. , but the crushing system is single, and the whole system adopts a series connection method, which is exposed to the atmospheric environment as a whole, which is easy to cause environmental pollution. The entire production line covers a large area, high energy consumption, high cost, single use, and cannot be crushed in river sand. Especially in the gravel field and the production in the mountains, it is not easy to popularize and apply

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