Production process of machine-made sand

Abstract

The invention provides a production process of machine-made sand. The process comprises the following steps of 1, carrying out first-time screening on raw materials to remove impurities and debris inthe raw materials so as to obtain block stones; 2, coarsely crushing the block stones to obtain the crushed stones, carrying out second-time screening on the crushed stones, wherein the crushed stoneswith the sizes larger than 400 mm are coarsely crushed again till the sizes are smaller than 400 mm, intermediately crushing is carried out on the crushed stones with the sizes smaller than 400 mm toobtain products I; 3, carrying out three-time screening on the products I, wherein re-intermediate-crushing is carried out on the crushed stones with the sizes larger than 10 mm till the sizes are smaller than 10 mm, and finely crushing is carried out on the crushed stones with the sizes less than 10 mm to obtain products II; 4, carry out four-time screening on the products II, wherein sand withthe sizes smaller than 3 mm enters a sand washing machine, and the sand with the sizes of 3-10 mm is finely crushed again into the sand with the sizes smaller than 3 mm, and then the sand enters the sand washing machine; and 5, obtaining the finished sand. The sand obtained through the production process has strong firmness and durability, and the granularity of the sand is more uniform.

Description

technical field [0001] The invention relates to a production process, in particular to a machine-made sand production process, and belongs to the technical field of machine-made sand preparation. Background technique [0002] It is estimated that the annual consumption of building aggregates in the country is about 9 billion tons, ranking first in the world. With the increasing development of infrastructure, after decades of mining in many areas of our country, the limited natural sand resources have been exhausted. The price keeps rising, which affects the development of engineering construction. For the protection of the environment and resources, the national and local governments strictly limit or prohibit the mining of natural sand regulations and policies, which further reduces the source of natural sand. sand. [0003] Machine-made sand refers to sand processed by sand making machines and other auxiliary equipment. The finished product is more regular and can be proc...

AI Technical Summary

Problems solved by technology

[0004] However, the current production and processing of machine-made sand processing technology is simple, the firmness and durability of the produced sand and gravel are relatively poor, and the product particle size is not uniform