It refers to the plane and elevation control network established to meet the precise needs of the mine production and construction for spatial location. 2. Basic requirements for mining area (well) measurement control network (1) A mine should use a uniform coordinate and elevation system. (2) The elevation of the mining area should use the 1985 national elevation benchmark as much as possible. (3) The ground plane control network of the mining area can be established by means of triangulation, corner net, wire mesh, GPS positioning and other methods. (4) The ground elevation control network of the mining area can be established by leveling and triangular elevation measurement. The triangular elevation is divided into photoelectric ranging triangle elevation measurement and theodolite triangle elevation measurement. The first-level control network is generally established by the quasi-measurement method. It should be set up as a ring network. When it is encrypted, it should be arranged as an attachment route and a node network. Only in mountainous areas and hilly areas, it is allowed to be laid into a level line.
According to the different production methods of calcium carbonate, calcium carbonate can be divided into Heavy Calcium Carbonate, light calcium carbonate, colloidal calcium carbonate and crystalline calcium carbonate. White solid, tasteless and odorless. There are two forms of amorphous and crystalline. The crystal type can be divided into orthorhombic crystal system and hexagonal crystal system, which are columnar or diamond-shaped.
Calcium carbonate is widely used in filling polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), acrylonitrile butadiene-styrene copolymer (ABS) and other resins. The addition of calcium carbonate has a certain effect on improving certain properties of plastic products and expanding their application range. In plastic processing, they can reduce resin shrinkage, improve rheology, and control viscosity. It can also play the following roles: Calcium Carbonate,Calcium Carbonate, Light Calcium Carbonate Henan Shunbang Chemical Industry CO.,Ltd , https://www.sblubricant.com
(1) Improve the dimensional stability of plastic products;
(2) Improve the hardness and rigidity of plastic products;
(3) Improve plastic processing performance;
(4) Improve the heat resistance of plastic products;
(5) Improve the astigmatism of plastics;
(6) It can make the product have some special properties;
(7) Reduce the cost of plastic products.
Concept and basic requirements of mining (well) measurement control network
1. The concept of mining area measurement control network