The use of dolomite manufacturers

Dolomite powder is ground by a pulverizer to obtain ultrafine powder of 325 mesh to 2500 mesh. After modification, it can be used in many industries. Now the editor of Guilin Hongcheng Vertical Mill has sorted out the use of dolomite powder from the Internet. All the prices that can be found so far are listed below.

The use of dolomite is mainly used to mix into the tire glaze as a flux. Some ancient kilns in the north, such as Ding kiln, often add dolomite to the body glaze, and some color glazes in Jingdezhen also add dolomite. 1. Introduction

Dolomite is an important calcium and magnesium resource on the earth, and it has extremely rich reserves in my country. The main producing areas are in Shandong, Liaoning, Shanxi, Hebei and Lianghu. It is a very versatile non-metallic mineral.

Dolomite powder supply

2. Development and application of dolomite ore series products

2.1 Metallurgical industry

2.1.1 Magnesium Smelting Industry

2.1.2 Refractory

As one of the important raw materials of basic refractories, dolomite is second only to magnesite in importance. It is mainly used for steelmaking converter lining, open hearth furnace, electric furnace wall, and secondly for heat treatment such as refining equipment outside the furnace and cement kiln. industrial equipment.

It is also reported that the hydration resistance of fired direct-bonded dolomite bricks is 4 times higher than that of asphalt-bonded bricks, and the hydration resistance of fired bricks can be further improved after being impregnated with asphalt.

2.1.3 Ironmaking blast furnace plugging materials

According to reports, Wuhan Iron and Steel once used dolomite with a raw ore particle size of 0-30 mm as a blast furnace hot metal hole plugging material. If the 0-30 mm dolomite is used as the hot metal hole plugging material for the steelmaking blast furnace, the effect is better than that of the hot metal hole plugging material directly, and the sales price is about 1,000 yuan/t, which has a good prospect.

dolomite sand price

2.2 Chemical Industry

2.2.1 Production of magnesium carbonate

The chemical composition (%) of dolomite required for the production of magnesium carbonate is as follows: MgO>18, CaO>29, SiO2<4, and there are no definite requirements for the content of K2O, Na2O and acid-insoluble matter. At present, there are mainly three kinds of magnesium carbonate produced: light magnesium carbonate, light spherical magnesium carbonate and light transparent magnesium carbonate.

(1) Production and application of light magnesium carbonate. (2) Production and application of light spherical magnesium carbonate. (3) Production and application of light and transparent magnesium carbonate.

2.2.2 Production of magnesium oxide

As a filler, magnesium oxide is widely used in rubber, enamel, wire and cable industries. In addition, magnesium oxide is also an indispensable refractory material. At present, the new process of extracting magnesium oxide from dolomite in China is the dolomite cycle method.

In addition, the production process and method of preparing special silicon steel grade magnesia with dolomite as the main raw material have also been developed.

2.2.3 Production of magnesium sulfate

(MgSO4•7H2O), also known as Epsom salt, is used in medicine, agriculture, cement, printing and dyeing, food and so on. At present, the magnesium sulfate industry is developing rapidly in the world. It mainly produces MgSO4•7H2O through the extraction of bittern or the sun in the sea and beach fields. There are also reports on the preparation of MgSO4•7H2O crystals by the sulfuric acid method using dolomite as a raw material.

Using dolomite to prepare magnesium sulfate can not only obtain the crystal of magnesium sulfate (MgSO4•7H2O), but also obtain the by-product CaSO4•H2O. dolomite sand price

2.2.4 Production of magnesium hydroxide

The production of magnesium hydroxide, in addition to the intermediate process of producing magnesium oxide above, can also be obtained by decomposing dolomite by dolomite ammoniation method or acid method.

2.2.5 Production of dolomite powder

Dolomite becomes dolomite powder after sorting, crushing and grinding to 325-1250 mesh. The purpose of modification is to change the surface alkalinity of dolomite powder, overcome the bonding performance between filler and rubber, reduce shrinkage and internal stress, prevent crack propagation, and improve the processing performance of product strength.

2.2.6 Production of Nanometer Calcium Carbonate Coated Dolomite Powder

2.3 Building materials industry

2.3.1 Development of magnesia cementitious materials

The main raw material of magnesia cementitious material is MgO, which is produced from magnesite as raw material. Now people consider using dolomite instead of magnesite to produce MgO. Magnesium-containing cement has been widely used in floorboards, rapid-setting pavement paving and repair of cracks in pavement. In addition, after caustic dolomite is produced by calcining dolomite, it can also be processed into magnesium hydroxide cement and magnesium oxide sulfate cement. These two non-hydraulic cementitious materials have the advantages of simple production process, fast setting and hardening, high strength, strong cohesion, good elasticity, wear resistance, convenient molding, low energy consumption, etc., and have high development and use value. It can be used to produce plastering mortar, concrete, magnesite products similar to wood (sawn board, particle board, sound insulation board, thermal insulation board) and artificial marble, etc. It is especially used for cementing organic materials and filling damaged, cracked and peeled parts of cement products . Magnesite floor tiles have the elasticity, toughness and thermal insulation properties of wooden floors, and are fireproof and mothproof, good water resistance, no cracking, and cheap. It is made of magnesium-containing cement (made by mixing magnesium chloride or magnesium sulfate solution with caustic dolomite powder) as cement, and then adding some fillers. Adding 10% to 20% additives (red shale, fly ash, talc or dolomite powder) into the magnesia-containing cement can overcome the disadvantages of magnesite floor tiles, such as easy warping deformation, surface moisture absorption and halogen return. It is widely used in the floors, walls and cylinders of industrial plants, public buildings and civil buildings.

In recent years, with the continuous development of the construction industry, the development and application of siliceous dolomite has been promoted. Dolomite has not only become the main mineral raw material for artificial marble and water mill (light) stone, but also some dolomite with compact structure and fine texture have also been rapidly developed as decorative materials and craft materials. It is reported that the magnesia composite material fired with high-quality dolomite as the main material is further processed into new decorative materials such as floor tiles, wall tiles and plates. It has many characteristics such as light weight, high strength, anti-aging, and beautiful appearance. , popular with people. Decorative railings and ornaments made of dolomite as the main material are also very popular.

2.3.2 Application in glass production

2.3.2.1 Production of glass

Dolomite and limestone are the third largest components in glass raw materials after silica sand and soda powder. In the production of bottle and can glass, soda powder is the most expensive component. Adding limestone can partially replace soda powder, but it will have adverse effects. The introduction of magnesium oxide into dolomite can further reduce costs. Dolomite can also provide calcium oxide in the glass industry, adding soda ash-grey-silica system to act as a flux. In addition, dolomite can also reduce glass aging, prevent chemical erosion caused by atmospheric or moisture, improve the plasticity of stained glass, and increase glass strength.

2.3.2.2 Production of glass-ceramic

Gold ore tailings, dolomite, etc. are used as raw materials, and Cr2O3 is used as a nucleating agent to make glass-ceramic and cast stone products. Wear-resistant materials for metallurgy and mining industries have opened up an effective way to solve the problem of environmental pollution.

2.3.3 Application in ceramic production

2.4 Other industries

2.4.1 Applications in Agriculture

Used to neutralize acidity in soil. Since the long-term use of urea and other fertilizers can easily cause the soil to be acidic, dolomite can be directly added to the urea to maintain a proper pH value of the soil, which can generally increase crop yield by 15% to 40%, and can also improve the efficacy of herbicides. , herbicide effect when 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 filler for fertilizers, it can improve the conditions for plants to utilize soil nutrients, reduce caking, and facilitate the adjustment of fertilizer ratio.

2.4.2 Application in environmental protection

Dolomite fine powder can be used to improve the flying of dust in coal mines and prevent and delay the explosion of coal dust. Dolomite powder is used as a filter material for water treatment, especially for neutralization from drinking water to industrial water, swimming pool water, etc., as well as for the removal of iron, manganese, and silicate. Research in this area is in progress.

2.4.3 Application of Calcium and Magnesium in Livestock and Poultry Feeds Calcium and magnesium are necessary nutrients for animals. Adding an appropriate amount of dolomite powder (or 0.1-1.5mm particles) to the livestock and poultry feeds can promote the growth of animals. Development, reducing disease is very beneficial. 2.4.4 Used as livestock and poultry disinfectant

Dolomite, which has a wide range of uses, has been researched by the research team of the Department of Agriculture, Tottori University, Japan, and has developed a new material that has a significant preventive effect on influenza viruses.

The dolomite used in this study was provided by Yuse Electric Co., Ltd. The researchers found that the new material they developed was put together with avian influenza virus to make a 0.6% solution. After shaking for 10 minutes, the number of viruses would be reduced to the original one. less than 1 in 100,000. This new material also has obvious killing effect on other viruses. Masks made of this new material can resist foreign viruses.

2.4.5 Coatings

After passing through the commonly used processes such as water selection, drying, pulverization, grinding, and grading, and then through chemical treatment, surface treatment, pH value adjustment, rinsing and other processes, the new type of extender pigment is obtained. Its chemical composition is stable, and it has many advantages such as weather resistance, anti-settling, fine powder, easy dispersion, high whiteness, low cost, unique process, etc. It can be used in various paints. The coating produced has the characteristics of reducing the amount of titanium dioxide, high hardness, good hand feeling, good flu, and strong adhesion, and the application effect is better than that of heavy calcium carbonate.