Barite is a very important non-metallic mineral raw material with a wide range of industrial uses.
1. Drilling mud weighting agent: When drilling some oil wells and gas wells, the drilling mud and clay generally used have a specific gravity of about 2.5, and the specific gravity of water is 1. Therefore, the mud weight is low, and sometimes the mud weight cannot be balanced with the underground oil and gas pressure. Caused a blowout accident. In the case of high underground pressure, it is necessary to increase the specific gravity of the mud. Adding barite powder to the mud is an effective measure to increase the specific gravity of the mud. The barite used for drilling mud generally has a fineness of more than 325 mesh. If the fineness of the barite is insufficient, precipitation is likely to occur. The barite for drilling mud requires a specific gravity of more than 4.2, the BaSO4 content is not less than 95%, and the soluble salt is less than 1%.
2. Zinc bismuth white pigment: Zinc bismuth white is a commonly used high quality white pigment, which can be used as a raw material for paints and paints. The mixture of barium sulfate and barium sulfide (BaS) can be reduced by using a reducing agent, and then a mixture of barium sulfate and zinc sulfide obtained by reacting with zinc sulfate (ZnSO4) (70% of BaSO4 and 30% of ZnS) is zinc barium. White pigment. The preparation of zinc-white barite requires a BaSO4 content of greater than 95% and should not contain visible colored impurities.
3. Various antimony compounds: using barite as raw material, it can produce chemical raw materials such as antimony oxide, barium carbonate, barium chloride, barium nitrate, precipitated barium sulfate and barium hydroxide.
Chemically pure barium sulfate is the standard for measuring whiteness; barium carbonate is an important raw material for optical glass, which introduces BaO into glass, thereby increasing the refractive index of glass and improving other optical properties; Barium chloride is an agricultural pesticide; barium nitrate is used in the fireworks and glass industries; barium permanganate is a green pigment.
4. Filler for industrial use: In the paint industry, barite powder fillers can increase film thickness, strength and durability. Zinc antimony pigments are also used in the manufacture of white paints, which have more advantages than lead white and magnesium white. Barite used in the paint industry requires sufficient fineness and high whiteness.
The paper industry, rubber and plastics industries also use barite as a filler, which improves the hardness, wear resistance and aging resistance of rubber and plastics.
Barite fillers for rubber and papermaking generally require BaSO4 to be greater than 98% and CaO to be less than 0.36%. Magnesium oxide, lead and other components are not allowed.
5. Mineralizer for cement industry: the use of barite and fluorite composite mineralizer in cement production has obvious effects on promoting C3S formation and activation of C3S. The quality of clinker is improved, and the early strength of cement is about Increasing 20 to 25%, the late strength is increased by about 10%, and the clinker firing temperature is lowered from 1450 ° C to 1300 ± 50 ° C. When the amount of barite is 0.8 to 1.5%, the effect is the best. In the production of white cement, after the barite and fluorite composite mineralizer, the firing temperature is lowered from 1500 °C to 1400 °C, the free CaO content is low, and the strength and whiteness are improved. Adding an appropriate amount of barite to the cement raw meal using coal gangue as raw material can greatly improve the cement strength of the clinker saturation ratio, especially the early strength, which is the comprehensive utilization of coal gangue for production. Low calcium, energy saving, early strength and high strength cement provide a beneficial way.
6. Anti-radiation cement, mortar and concrete: using barite to absorb X-rays, using barite as bismuth cement, barite mortar and barite concrete, instead of metal lead plate shielding nuclear reactor and construction research, Hospital anti-X-ray buildings.
Tantalum cement is made of barite and clay as the main raw material. After sintering, the clinker composed of dimuth silicate as the main mineral is added, and the appropriate amount of gypsum is added to grind together. The specific gravity is higher than that of ordinary Portland cement, which can reach 4.7-5.2. The strength number is 325-425. Due to the large specific gravity of the concrete, it can be combined with heavy aggregates (such as barite) to form a uniform and dense anti-X-ray concrete.
Mortar is a kind of mortar with large bulk density and barrier effect on X-rays. It is generally required to use Portland cement with low hydration heat. The cement: barite powder: barite sand: coarse sand mix ratio is usually used. : 0.25:2.5:1. Barite concrete is a kind of concrete with large bulk density and shielding ability for X-rays. Cementitious materials generally use Portland cement with low hydration heat or special cement such as high alumina cement, strontium cement and strontium cement. Portland cement is the most widely used. The commonly used cement: barite crushed barite sand: water mixture ratio is 1:4.54:3.4:0.5; 1:5.44:4.46:0.6; 1:5:3.8:0.2.
For anti-radiation mortar and concrete barite, the content of BaSO4 should not be less than 80%, and the impurities such as gypsum, pyrite, sulfide and sulfate should not exceed 7%.
7. Road construction: Rubber and asphalt mixtures containing about 10% barite have been successfully used in parking lots and are a durable paving material. At present, the tires of heavy road construction equipment have been partially filled with barite to increase the weight and facilitate the compaction of the filling area.
8. Other: barite and oil are blended and applied to the cloth base to make tarpaulin; barite powder is used to refine kerosene; in the pharmaceutical industry, it can be used as a digestive tract contrast agent; it can also be used for pesticides, leather making, fireworks, etc. In addition, barite is also used as an extraction metal crucible for use as a getter and binder for televisions and other vacuum tubes. It is alloyed with other metals (aluminum, magnesium, lead, calcium) for bearing manufacturing.
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