Dolomite is a carbonate mineral that exists in two forms, namely iron dolomite and manganese dolomite. Its crystal structure closely resembles calcite and often exhibits a rhombohedral shape. When subjected to dilute hydrochloric acid, it gradually releases bubbles when cold. Certain types of dolomites emit an orange-red glow upon exposure to cathode rays. Dolomite serves as the primary mineral component in both dolomite and dolomitic limestone, finding applications in various fields such as construction materials, ceramics, glass and refractory materials, chemical industry, agriculture, environmental protection, energy conservation etc. It is primarily utilized as an alkaline refractory material and flux for blast furnace iron smelting; additionally employed in the production of calcium magnesium phosphate fertilizer and magnesium sulfate; furthermore used in the manufacturing of glass and ceramic ingredients - these applications are commonly associated with dolomite; however, its role in environmental protection should not be overlooked.
The Fundamental Properties of Dolomite
Dolomite belongs to the trigonal crystal system and has a chemical composition of CaMg(CO3)2. It primarily consists of calcium carbonate and magnesium carbonate minerals, displaying complete cleavage and rhombohedral crystallization. The color of dolomite varies, encompassing white, gray, flesh-colored, colorless, green, brown, black, dark pink hues among others. It exhibits transparency to translucency with a glassy luster. Dolomite possesses a hardness ranging from 3.5 to 4 on the Mohs scale and a specific gravity between 2.85 and 2.9. Moreover, it demonstrates surface adsorption properties as well as filter effects on pores while facilitating ion exchange between layers.
The Role of Dolomite In Environmental Protection is Significant
According to the characteristics of dolomite, it can be utilized in the following domains:
The fine dolomite powder exhibits enhanced efficacy in coal mine dust suppression and serves as a preventive measure against gas explosions.
Dolomite powder finds application as an effective filtration material for water treatment, particularly for potable water, swimming pool water, and neutralization purposes such as iron, manganese, and silicate removal.
Dolomite also functions as an environmentally-friendly mineral material with adsorption capabilities at a low cost and without causing secondary pollution. It is extensively employed for anti-corrosion purposes in water supply systems including filters, pipe linings, and backfills.
Moreover,dolomite minerals are commonly employed to elevate the PH level of purified reverse osmosis drinking water.
(1)Filter Impurities In Water
After undergoing treatment to render it potable, the water typically undergoes a softening process, resulting in reduced mineral content and increased acidity (a characteristic commonly associated with "corrosive" water). In addition to causing pipe damage, corrosion can lead to unpleasant odors, stains, and toxicity. Small-scale water distribution systems often employ alkaline media filters or contactors along with filter beds containing dolomite to adjust the pH level of the water within the range of 7-8. Water that contains an appropriate amount of calcium or magnesium salts (to prevent the formation of hard water scale) is also less prone to corrosion as these minerals form a protective coating on the inner walls of pipes while enhancing taste. Dolomite present in the filter or contactor serves as an excellent source for these minerals since it dissolves in slightly acidic filtered water.
(2)Pipe lining material
The study shows that the pipe wall with dolomite coating has the lowest corrosion rate compared with other materials.
(3)Bedding and backfill materials
Bedding and backfill materials, including dolomite, protect underground pipes from corrosion. Water from desalination or reverse osmosis treatment is usually passed through an alkaline medium filter containing dolomite to prevent corrosion and enhance taste.
Dolomite Grinding Mill
The application of environmentally friendly dolomite powder is closely associated with human health and safety, thus necessitating a high demand for dolomite in terms of fineness, requiring a minimum particle size of 2000 mesh. Clirik recommends utilizing either the HGM type ultrafine grinding mill or the CLUM type ultrafine vertical grinding mill.
The dolomite ultrafine grinding mill boasts a high level of fineness, making it the ideal equipment for grinding ultrafine powder. Widely used in mining, our feldspar ultrafine grinding mill can produce finished powder with a minimum fineness of up to 3000 mesh. As one of the latest technologies in the field of feldspar milling, more and more people prefer using the energy-efficient and highly efficient feldspar ultrafine grinding mill to process their powder.
In order to mitigate the issues of prolonged material retention time, repetitive grinding, and high iron content in traditional mills, Clirik has devised a distinctive grinding curve for the roller shell and liner. This design facilitates the formation of a material layer, enabling efficient grinding with high output. Consequently, it significantly enhances mill productivity while improving the whiteness and cleanliness of the final product. The CLUM series mill incorporates PLC control system and multi-head powder selection technology, effectively resolving two major challenges: "achieving precise and accurate cutting of powder diameter" as well as "swift switching between different production requirements". Users can precisely regulate equipment working parameters such as grinding pressure and speed. Compared to conventional mills, this mill reduces energy consumption by 30%-50%. During the design process of calcium carbonate superfine vertical mill, Clirik thoroughly considered potential maintenance issues associated with heavy rollers. As a result, they developed a reversible structure along with a hydraulic control system that enables operators to easily and swiftly remove rollers from their bodies for inspection or replacement of roller shells and bushings or other maintenance operations. This effectively minimizes downtime losses.
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