In the construction industry, quartz sandstone has great market prospects and is a good subgrade material. Quartz sand vertical mill is a good equipment for processing quartz sand. It can grind and crush quartz sand to varying degrees, which meets the production needs of enterprises. Why are mine investors unwilling to use waste rock slag and spend a lot of money to buy sandstone mines?

Gravel aggregate is the largest, indispensable and irreplaceable basic material for the construction of infrastructure projects such as buildings, roads and bridges.

However, sand and gravel aggregates are non renewable resources, and thousands of years of mining has caused great damage to the earth's environment. In China's metal and non-metal mining industry, in the process of long-term mining and production, mines produce a large number of waste rocks and tailings. The use of these tailings resources can completely or partially replace sand and gravel aggregates.

On May 18, 2016, the general office of the State Council issued the guiding opinions of the general office of the State Council on promoting the steady growth of the building materials industry, adjusting structure and increasing benefits (GBF [2016] No. 34), which clearly pointed out that it is required to actively replace natural resources with solid wastes such as tailings, waste rock and construction waste, and develop products such as machine-made sandstone, concrete admixture and block wall materials. Encourage enterprises to integrate silica sand for glass, quartz sand and tailings, waste rock and other resources for sand and gravel aggregate, and improve the level of comprehensive utilization.

The proposal of this requirement will bring clear policy guidance to the field of tailings and construction waste reuse, and point out a new direction for the development of gravel aggregate industry.

Problems in replacing sand and gravel aggregate with waste rock and tailings

It is technically feasible to replace sand and gravel aggregate with waste rock and tailings in the process of mining, but there are still some problems in the process of popularization and application:

(1) At this stage, the entry threshold of the resource recycling industry is low, the product standard system and supervision system have not been established, the non-standard operation is common, and the product standard is seriously lagging behind, which makes it difficult for the comprehensive utilization products to enter the mainstream market.

(2) The existing policies are not strong enough, lack of mandatory requirements and targeted reward and punishment measures for the comprehensive utilization of resources in the industrial field, and enterprises lack the pressure and motivation to use resources in the industrial field.

(3) The market of products for comprehensive utilization of industrial solid waste resources, including recycled aggregate, is not standardized, the market supervision is not perfect, the situation of indiscriminate mining and excavation continues despite repeated prohibitions, and the market competitiveness of green products of industrial solid waste is weak.

(4) China is obviously not enough in the publicity and education of green consumption, some consumers do not have a deep understanding of green consumption, and their awareness of green consumption is weak.

(5) In the process of consumption, they are more concerned about the price of products, often choose products with low price, and rarely consider the production process of the product and the resource conservation and environmental protection of the product itself. They fail to realize that saving resources and protecting the environment are closely related to their consumption behavior.