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Which stones can be used to make sand and can they meet the standards for building sand?
view：565 source： Time：2020-4-7
At present, there are many types of stones that can be used for sand production in the mining industry, about 200 kinds. Basically, as long as the ore with low added value and low water content can be used for sand production, including the tailings produced by beneficiation, it can also be used. To make sand. Raw materials are an important factor that directly affects the quality of sand and gravel products. The characteristics and structure of the raw materials, as well as the factors that exhibit different characteristics with environmental changes, are most likely to cause quality accidents in an imprudent manner. Therefore, raw materials must be treated seriously and rigorously to ensure the quality of production materials.
Not all materials can be used to produce machine-made sand. When producing machine-made sand, there are certain requirements for raw materials, such as: 1. The compressive strength of the raw materials used to produce machine-made sand should not be less than 80 MPa, and the materials should not have potential alkali-aggregate reactivity. Clean, hard and non-soft granular raw materials should be used. 2. In the selection of mines, avoid using mines with relatively thick overburden soil, more mud in the interlayer, and poor quality such as stratified rocks. 3. Choose raw materials with exposed rock formations. If they are covered with soil layers or contain weathered layers, they should be removed in time. Common raw materials that can produce machine-made sand are: 1. Sandstone: a kind of sedimentary rock with a sand content greater than 50% and a stable structure. It is mainly composed of quartz and feldspar. It is a common raw material for the production of machine-made sand. However, due to the high content of stone powder during the crushing process, it is used as the raw material for the production mechanism When sanding, choose sand production line equipment with better dust removal effect. 2. Quartz sandstone: Stones with a quartz content of more than 90% can achieve very good results in both strength and grain size. It is a relatively common raw material for machine-made sand production in the market. 3. River pebble: a kind of pure natural stone, non-toxic, odorless, non-bleaching, hard texture, and good color. The manufactured sand is not only an ideal green building material, but also a better choice to replace natural sand. 4. Slag: A kind of industrial waste, it is also a kind of raw material for the production of machine-made sand, which has a wide source and low cost. 5. Construction waste: The domestic output is relatively large each year. Among the construction waste, concrete blocks, gravel blocks, and brick and tile fragments are often used to produce sand and gravel aggregates for construction, highways and other industries, using them as raw materials for production Machine-made sand can save raw material investment costs. 6. Limestone: It can be used as raw material for sand and stone at the same time in the sand and stone production line, and stone powder can be reused. 7. Basalt: Sand made of basalt mixed with concrete can reduce the weight of the concrete, but it is still very strong. At the same time, it has the characteristics of sound insulation and heat insulation. It is a good aggregate of lightweight concrete for high-rise buildings. 8. Granite: Granite with high quartz content and low sulfide content is a good quality raw material for sand making, but the problem of powder must be solved. General sand making process-take cobblestone as an example The pebbles are fed into the jaw crusher by a vibrating feeder at a uniform speed. The jaw crusher coarsely breaks the pebbles by changing the distance between the movable jaw and the static jaw. The pebbles that have passed through are sent to the hydraulic pressure by the belt conveyor. In the cone crusher, the pebbles are further finely crushed through the change of the distance between the moving cone and the static cone of the cone crusher in the crushing cavity. The subsequent pebbles are screened through the vibrating screen and the qualified pebbles are sent to the sand washing machine by the conveyor The unqualified pebbles are returned to the hydraulic cone crusher. The finely crushed pebbles are removed in the sand washing machine, and then sent to the PLS series sand making machine by the conveyor for grinding. The ground pebbles are screened through the vibrating screen. After being returned to the sand making machine for reprocessing, the cobblestone aggregate is qualified. General sand and gravel aggregate production lines generally use: jaw crusher-impact crusher-cone crusher-sand making machine and other equipment. In order to obtain aggregate products that meet the standards, the main equipment will be selected Become a problem to be considered in the design of the production line. 1. For the rock with relatively high hardness, you can choose jaw crusher + cone crusher + grinder. The reason for choosing sand making machine is because the cone crusher has more aggregate needle flake content. Here The sand making machine is recommended to use the PLS impact sand making machine with uniform particle size and good crushing effect. 2. For limestone, moderate hardness index, stone production line, you can choose jaw crusher + impact crusher, through the secondary crushing, the material can achieve the desired effect. Does the finished material processed by the stone sand making machine meet the standards for construction sand? The answer is definitely consistent. With the scarcity of natural sand resources, artificial sand must replace natural sand. Our common river pebble, quartz stone, granite and other stones can all be crushed into sand, and the granularity of the finished material is uniform and beautiful. The sand that is crushed by a crusher, finely crushed by a sand making machine and then reshaped has stable performance, and the size of the finished product The particles are uniform, the permeability is good, the needle flake shape is low, and the stone cube has a polygonal surface (high bonding strength), which can meet the aggregate demand of national key projects and expressways. Moreover, the raw materials are easy to obtain, unlike natural sand, which is difficult to mine, and the grade is not up to the requirements. Common ores such as pebbles, river pebbles, limestone, quartz stone, iron ore, etc. can be processed into qualified construction sand. Compared with natural sand, they are more popular, and they are currently at the price of aggregates. Under the situation of rising and rising and short supply in the market, the sale of machine-made sand is very good.
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