Mining steps and tertiary reserves
Relationship between secondary and tertiary reserves and mining steps
According to the preparation degree of mining, the ore reserves can be divided into three levels, namely, exploiting reserves, mining reserves and reserve reserves. These three reserves are called tertiary reserves.
(1) Exploiting reserves
Through the tunneling and opening of the roadway, a certain transportation, ventilation and drainage system has been formed. The deposits in the area controlled by these development roadways are called exploiting mines.
(2) Acquisition of reserves
It is part of the exploitation of minerals. Where the mining area or the mining wall, the amount of mining work specified in the mining method is completed, and the reserves in these mining areas or mine walls are called mining reserves.
(3) Reserves
It is part of the acquisition reserve. The reserves of the cutting engineering quantity specified in the mining method in the mining area or the mining wall are called reserve reserves.
In the three steps of mining above, in the initial stage of mining, each mining step is carried out in sequence, that is, the required three-level reserves can be put into production according to the infrastructure schedule; in the normal production period (ie, after the production), the implementation should be implemented. The principle of "excavating and cultivating first." Generally, it is necessary to ensure the indicators of the three-level reserves, otherwise there will be mining disorders, which will cause the mining production to be in a chaotic and passive situation. Therefore, we must always pay attention to properly arrange the development, mining, and recovery work. It is necessary to follow the principle of pioneering the advance and adopting the advanced mining. Only in this way can the production of the mine be sustained, stable and balanced. This is because development, precision and cutting reflect the level of readiness for mining. The advanced relationship between the above three steps, the degree of preparation is usually expressed by the mining time required for the three-level ore provided by the tunneling, mining, and mining roadway. In general, mines should have more than three years of mining capacity, about one year of mining and mining, and about six months of preparation.
The die casting process involves the use of a furnace, metal, die casting machine, and die.
The metal, typically a non-ferrous alloy such as aluminium or zinc, is melted in the furnace and then injected into the dies in the die casting machine. After the molten metal is injected into the dies, it rapidly cools and solidifies into the final part, called the casting parts.
The castings that are created in this process can vary greatly in size and weight, ranging from a couple of ounces to 100 pounds. One common application of die-cast parts are housings - thin-walled enclosures, often requiring many ribs and bosses on the interior.
Metal housings for a variety of appliances and equipment are often die cast.
Several automobile components are also manufactured using die casting, including pistons, cylinder heads, and engine blocks. Most home appliances also need lightweight and r aluminum die castingheat dissipation . Other common die cast parts include propellers, gears, bushings, pumps, and valves.
Belt Pulley,Wind Impeller,Washing Machine Pulley,Washing Machine Motor Pulley
Ningbo Sunlee Electrical Technology Co. , Ltd. , https://www.nbsunlee.com