Sandstone is the main ingredient of concrete (about 80%), and the domestic market shows a large and increasing demands for sandstone from 2011, and the price of medium sand (2.3mm~3.0mm in granularity) rises from 78.4 yuan/ton to 92.5 yuan/ton in one year, about 18%up.
According to the incomplete statistics of China Sand Making Machine Association, the domestic sandstone consumption has risen from less than 500 million tons in 1981 to 12 billion tons in 2013, and the annual sale has risen more than 20 times. Based on this speed, the sandstone will be in shortage in the following years even if its production is improving rapidly.
This situation also brings opportunity to artificial sand production. The so-called artificial sand is granular ore less than 4.75mm in granularity produced by crushing and screening equipment. The artificial sand has rich raw material source, and it can be said where there is stone, there is sand. In addition, the municipal construction wastes and mining tailings also can be produced into artificial sand.
So Machinery produced a professional sand production line which has a high productivity and low energy consumption.
The electricity consumption of sand production line is only 2.3 kilowatt per ton, and its feeding granularity can achieve 100mm. during the process, there is no need for cone crusher. Its one-time sand rate can reach 60%. Its final products are even in granularity and reasonable in grading, among which the products between 1.2~2.6mm accounts for more than 60%. Although there is similar dry type sand making system which requires the feeding granularity smaller than 40mm, it will limit the sand production line. Besides, it needs crushing equipment which improves the construction cost.
At last, the adoption of high-quality artificial sand can save more than 50kg cement per m3 concrete. According to the incomplete statistics, the concrete production is 2,196 million m3, and it can save 100 million tons cement all together. If we price it for 300 yuan/ton, it will save about 30 billion yuan in one year.