The chemical composition of dolomite is CaMg (CO3) 2, which is a carbonate mineral, including iron dolomite and manganese dolomite. Its crystal structure is like calcite, often showing rhombohedron.
Dolomite is a carbonate mineral, including iron dolomite and manganese dolomite. Its crystal structure is like calcite, often rhombohedral. It will slowly foam when it encounters cold dilute hydrochloric acid. Some dolomite emits orange-red light under cathode ray irradiation. Dolomite is the main mineral component of dolomite and dolomitic limestone. Dolomite can be used in building materials, ceramics, glass and refractory materials, chemical industry, agriculture, environmental protection, energy saving and other fields. It is mainly used as a flux for basic refractories and blast furnace ironmaking; and as an ingredient for the production of glass and ceramics.
Dolomite becomes dolomite powder after selection, crushing and grinding to 325-1250 mesh. When dolomite powder is added to natural rubber and synthetic rubber, its rubber performance is basically the same as that of light calcium powder, but the cost is lower than that of light calcium powder.
What Is Dolomite Powder Commonly Used For
Different fineness dolomite powder can be applied for various fields, specific fineness and usages are as follows:
1. Coarser than 200mesh: It can be used for a variety of feed additives (calcium content should be more than 55.6%, with no harmful ingredients);
2. 250-325mesh: Used for plastic, rubber factory, paint factory, waterproof material plant as raw materials and interior and exterior paint coatings (whiteness should be more than 85 degrees);
3. 350-400mesh: Used for the manufacture of pinch, the water pipes, chemical (whiteness should be above 93 degrees);
4. 400-600mesh: Can be used for toothpaste, soap (whiteness should be more than 94 degrees);
5. 800mesh: Used in rubber, plastics, cables, PVC (whiteness should be more than 94 degrees);
6. 1250mesh: Used for PVC, PE, paint, paper primer, topcoat paper (whiteness should be more than 95 degrees);
In addition, the dolomite powder has characteristics of high purity and high brightness, non-toxic, odorless, fine oil, low hardness, can be used as calcium supplements, the absorption rate can be up to 39%, right after the Calcium citrate malate, it is soluble in gastric acid, it has the most formulations and become the most widely-used calcium supplements; Also, because the dolomite is one kind of calcium carbonate, it is alkaline, often used to improve acidic soil.
In the glass industry, dolomite can also reduce the aging of glass, prevent the chemical erosion produced by the atmosphere or moisture, improve the plasticity of colored glass, and increase the strength of glass. Adding a certain amount of dolomite powder in the manufacture of glass can effectively reduce the high-temperature viscosity of the glass and improve the chemical stability and mechanical strength of the product. Practice also shows that: the introduction of dolomite powder in the preparation of low-temperature ceramics and float glass ingredients can significantly save energy consumption.
In the field of environmental protection, dolomite has basic properties such as surface adsorption, pore filterability, and ion exchange between ore layers. 200-mesh dolomite can be used as an environmental mineral material in the field of adsorbents. Secondary pollution and other advantages. It can be used to adsorb heavy metals, phosphorus, boron, printing and dyeing wastewater, etc., which have obvious effects.
In the field of refractory materials, when dolomite is calcined at 1500°C, magnesium oxide becomes periclase, and calcium oxide is transformed into crystalline α-calcium oxide. It has a compact structure, strong refractoriness, and a refractoriness as high as 2300°C. The raw material used for the material. Magnesia-calcium bricks, magnesia-calcium-carbon bricks, magnesia-calcium sand, spinel-calcium aluminate refractories and other commonly used dolomite with a fineness of 200 mesh.
In agriculture, it is used to neutralize the acidity in the soil. Since long-term use of urea and other fertilizers is likely to cause soil acidity, dolomite can be directly added to urea to keep the soil at an appropriate pH value, which can generally increase crop yield by 15% to 40%, and can also improve the efficacy of herbicides , Herbicides are most effective when the pH is 6.0-6.2. Dolomite can also compensate for the loss of magnesium content in the soil. Dolomite particles of 1.2-0.8um can flow freely. Used as a fertilizer filler, it can improve the conditions for plants to use soil nutrients, reduce agglomeration, and facilitate the adjustment of fertilizer ratios. In livestock and poultry feed, calcium and magnesium are essential nutrients for animals. Adding an appropriate amount of dolomite powder in livestock and poultry feed is very beneficial for promoting the growth and development of animals and reducing diseases.
In building materials, the manufacture of magnesium oxychloride cement is another important use of dolomite. This magnesium-containing cement has good properties such as compressive strength, flexural strength and corrosion resistance. In particular, the stability of the magnesium oxychloride cement prepared by using the caustic powder prepared by dolomite calcined in a flame-chambered manner is better. Magnesium-containing cement has been widely used in floor boards, rapid-setting pavement paving and repair of pavement cracks and cracks. In addition, after calcining dolomite to generate caustic dolomite, it can also be processed into magnesium hydroxide cement and magnesium oxide sulfate cement. These two non-hydraulic gelling materials have the advantages of simple production process, fast setting and hardening, high strength, strong cohesive force, good elasticity, wear resistance, convenient molding, low energy consumption, etc., and have high development and use value.
Different Mills For Dolomite Processing With Different Product
For large-scale production lines with dolomite grinding powder below 400 mesh, Shanghai Zenith Mineral Company chooses to use vertical roller mills and MTW Trapezium roller mills; above 400 meshes, we choose to use XZM micro-powder ultrafine mills.
There are many kinds of dolomite milling equipment. According to the different requirements of different industries, different milling equipment can be selected. For different purposes of dolomite milling, Shanghai Zenith Mineral Company will recommend a suitable mill for you. Zenith has the opportunity to select milling equipment models and quotations based on your specific milling production needs to achieve your milling purposes.
Dolomite Mill Development Trend
First, the large-scale equipment. With the advancement of science and technology and the development of advanced technology, the advantages of large-scale production equipment are becoming more and more obvious. Coupled with the development of mechanical structure design and manufacturing technology, dolomite milling equipment is developing towards large-scale development.
Second, the structure is compact. With the development of high technology, the requirements for compact structure of dolomite milling equipment are becoming higher and higher. The compact structure can reduce the production cost of the equipment to a certain extent, reduce the occupied area and improve the working efficiency of the equipment.
Finally, the control system is automated. With the advancement of science and technology and the development of automatic control technology, today’s users have higher and higher requirements for equipment automation. A large-scale grinding equipment only needs one operator on-site care, which greatly reduces the labor intensity of labor. , But also to ensure the normal flow of operations. The realization of automation can also ensure the accuracy of the entire production process, thereby improving product quality.