Product model and index of natural barium sulfate (barite):

Barite is a non-metallic mineral product with barium sulfate (BaSO4) as the main component. Pure barite is white and shiny. It is often gray, light red, light yellow, etc. due to the influence of impurities and mixtures. Fairly good barite can also appear as transparent crystals. Barite sulphate mineral. The composition is BaSO4. The most widely distributed barium-containing mineral in nature. Barium can be replaced by strontium isomorphism to form lapis lazuli; partially replaced by lead to form Beitou stone barite is an important non-metallic mineral raw material, which has a wide range of industrial applications.

Barite is an important non-metallic mineral raw material and has a wide range of industrial applications.

1. Drilling mud weighting agent. In the drilling of some oil and gas wells, the drilling mud and clay generally have a specific gravity of about 25, and the specific gravity of water is 1. Therefore, the specific gravity of the mud is low, and sometimes the mud weight cannot be balanced with underground oil and gas pressure , Causing blowout accidents. 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. Barite used for drilling mud generally needs to have a fineness of more than 325 mesh. If the barite is not fine enough, precipitation will easily occur. Barite for drilling mud requires a specific gravity greater than 4.2, BaSO 4 content is not less than 95%, and soluble salts are less than 1%.

2. Zinc barium white pigment, zinc barium white is a commonly used high-quality white pigment, which can be used as a raw material for paints and painting pigments. Barium sulfate is heated, and it can be reduced to barium sulfide (BaS) by using a reducing agent. The mixture of barium sulfate and zinc sulfide (BaSO 4 accounts for 70% and ZnS accounts for 30%) is obtained by reacting with zinc sulfate (ZnSO 4). Zinc barium white pigment. The preparation of zinc barium white barite requires BaSO 4 content greater than 95%, and at the same time it should not contain visible colored impurities.

3. Various barium compounds, using barite as raw materials, can produce barium oxide, barium carbonate, barium chloride, barium nitrate, precipitated barium sulfate, barium hydroxide and other chemical raw materials. Chemically pure barium sulfate is the standard for measuring whiteness Barium carbonate is an important raw material for optical glass. It introduces BaO into the glass, thereby increasing the refractive index of the glass and improving other optical properties. It is used to prepare glazes in ceramics. Barium chloride is an agricultural pesticide Barium nitrate is used in the fireworks and glass industries; barium permanganate is a green pigment.

4. Barite for filler industry. In the paint industry, barite powder filler can increase paint film thickness, strength and durability. Zinc-barium white pigments are also used to make white paints, and indoor use has more advantages than lead white and magnesium white. Barite for the paint industry requires sufficient fineness and high whiteness. The paper industry, rubber and plastics industry also uses barite as a filler, which improves the hardness, abrasion resistance and aging resistance of rubber and plastics. Barite fillers for rubber and papermaking generally require BaSO 4 to be greater than 98% and CaO to be less than 0.36%. Magnesium oxide, lead and other components are not allowed.

5. Mineralizers for the cement industry. The use of barite and fluorite composite mineralizers in cement production has a significant effect on promoting the formation of C 3 S and activating C 3 S. The quality of clinker has been improved. Cement The early strength can be increased by about 20 to 25%, and the later strength can be increased by about 10%. The clinker firing temperature is reduced from 1450 ° C to 1300 ± 50 ° C. The effect is better when the barite content is 0.8 to 1.5%. In the production of white cement, after using barite and fluorite composite mineralizers, the firing temperature was reduced from 1500 ° C to 1400 ° C, the free Ca O content was low, and the strength and whiteness were improved. Adding an appropriate amount of barite to cement raw material using coal gangue as raw material can greatly improve the strength of cement with low clinker saturation ratio, especially the early strength. This is the comprehensive utilization of coal gangue and production Low-calcium, energy-saving, early-strength and high-strength cements provide a beneficial approach.

6. Anti-ray cement, mortar and concrete, using barite to absorb X-rays. Barium cement, barite mortar and barite concrete are made of barite to replace metal lead plates to shield nuclear reactors and construction. X-ray-resistant buildings for scientific research and hospitals. Barium cement is made of barite and clay as the main raw materials. After sintering, clinker with dibarium silicate as the main mineral is added, and an appropriate amount of gypsum is added and ground 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 barium cement, it can be formulated with heavy aggregates (such as barite) to make uniform and dense X-ray-resistant concrete.

Barite mortar is a mortar with a large bulk density and a barrier effect against X-rays. Generally, Portland cement with low heat of hydration is required. Commonly used cement: barite powder: barite sand: coarse sand. The ratio is 1: 0.25: 2.5: 1. Barite concrete is a kind of concrete with large bulk density and shielding ability against X-rays. Generally, cementitious materials are Portland cement with low hydration heat or high-alumina cement, barium cement, strontium cement and other special cements. Portland cement is the most widely used. For the barite of anti-ray mortar and concrete, 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 mixture containing about 10% barite has been successfully used in parking lots, is 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 consolidation of the filling area.

8. Others: Barite and oil are blended and then coated on the cloth base to make linoleum; barite powder is used to refine kerosene; used as a contrast agent for digestive tract in the pharmaceutical industry; it can also be used to produce pesticides, leather, and fireworks. In addition, barite is also used to extract barium metal, as a getter and adhesive for TV and other vacuum tubes. Barium is alloyed with other metals (aluminum, magnesium, lead, calcium) for bearing manufacturing.

Barite is chemically stable, insoluble in water and hydrochloric acid, and non-magnetic and toxic. Barite crystals belong to orthorhombic (orthorhombic) sulphate minerals. Often thick plate-like or columnar crystals, mostly dense block or plate-like, granular aggregates. When pure, it is colorless and transparent. When it contains impurities, it is dyed into various colors. The streaks are white. The glass is shiny and transparent to translucent. The three groups are completely cleaved, and the included angle is equal to or close to 90 °. Mohs hardness is 3-3.5, specific gravity is 4.0-4.6. Identification characteristics: plate-like crystals, small hardness, complete cleavage near the right-angle intersection, high density, no foaming in the presence of hydrochloric acid, and distinguish it from similar calcite. Barite is a non-metallic mineral product with barium sulfate (BaSO4) as the main component. Pure barite is white and shiny. It is usually gray, light red, light yellow, etc. due to the influence of impurities and mixtures. Crystallization Fairly good barite can also appear as transparent crystals.