Barite Series
Barite is the most common mineral of barium. It is composed of barium sulfate. Produced in low temperature hydrothermal veins, such as quartz-barite veins, fluorite – barite veins, often with galena, sphalerite, chalcopyrite, cinnabar and other symbiosis. The barite deposits produced in Hunan, Guangxi, Qinghai and Jiangxi are mostly huge hydrothermal single mineral veins. Barite can also be produced in sedimentary rocks, nodular appearance, mostly exist in sedimentary manganese deposits and shallow sea argillaceous, sandy sedimentary rocks. In the residual clay covering layer of weathering residual deposit, it is often formed into clumps and nodules.
Chemical composition :BaO:65.7%, SO3:34.3%. There are Sr, Pb and Ca homomorphic substitution in the composition.
Barite crystals are large, tubular, and together they sometimes form rose-shaped or bifurcated crystals called crested barites. Pure barite is colorless and transparent, generally white, light yellow, with glass luster. And barite can be used as white pigment (we commonly known as Lide powder), can also be used in chemical industry, paper, textile filler, in glass production it can act as a flux and increase the brightness of glass. But it is primarily used as a weighting agent in the drilling industry and in the extraction of barium.
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Description
Structural property
| Barite is a non-metallic mineral product with barium sulfate (BaSO4) as the main component. Pure barite is white and glossy. Due to the influence of impurities and mixtures, it is often gray, light red, light yellow, etc., and the crystallization of barite is quite good. Barite sulfate minerals. The composition is BaSO4. The most widely distributed barium mineral in nature. Barium can be replaced by strontium isoplasms to form lapis lazuli. It is partially replaced by lead to form Beitou stone (named after the hot spring in Beitou, Taiwan). Orthonormal (rhombic) crystalline system, crystal often thick plate. Pure barite transparent colorless, generally white, light yellow, glass luster, cleavage face is pearl luster. With three directions of complete and medium cleavage, Mohs hardness 3~3.5, specific gravity 4.5. It is mainly formed under low and medium temperature hydrothermal conditions. | |||
| Barite is chemically stable, insoluble in water and hydrochloric acid, non-magnetic and toxic. The chemical composition of barite is Ba[SO4], the crystal belongs to the orthogonal (rhombic) crystal system of sulfate minerals. It is often thick plate or columnar crystal, mostly dense block or plate, granular | |||
| Barite aggregate. When pure, it is colorless and transparent. When containing impurities, it is dyed into a variety of colors. Stripes are white, glass luster, transparent to translucent. The three groups of cleavage are complete and the included Angle is equal to or close to 90°. Mohs hardness 3-3.5, specific gravity 4.0-4.6. Characteristics: tabular crystals, small hardness, complete cleavage at nearly right angles, high density, no foaming in the presence of hydrochloric acid, and thus distinguished from similar calcite. Barite is a non-metallic mineral product with barium sulfate (BaSO4) as the main component. Pure barite is white and glossy. Due to the influence of impurities and mixtures, it is often gray, light red, light yellow, etc., and the crystallization of barite is quite good. Barite is a mixture. |
Purification technique
With the high-quality, single barite mines drying up, most of the barite mines in our country are of low grade, which closely associated with other metal and non-metallic mines, directly affecting their utilization value in industry. Barite weighting agent for drilling mud is generally required to reach fineness above -0.056mm, density > 4.2g/cm, grade > 95%, soluble salt content 98%, CaO content < 0.36%, and do not contain magnesium oxide, lead and other harmful ingredients. Barite with different uses has different requirements on barite purity, whiteness and impurity content.
1. Physical purification
Physical purification methods of barite mainly include: hand selection, gravity separation, magnetic separation. The main basis of hand selection is the difference in color and density between barite and associated ore. After coarse crushing of raw ore, barite minerals and gangue minerals can be effectively dissociated, and massive barite can be selected by hand. For example, in Pancun mine in Xiangzhou, Guangxi, the particle size of 30~150mm and the content of BaSO4 > can be obtained by hand separation method. It’s 92% rich. Hand separation method is simple, convenient and easy to operate, low dependence on equipment, small cost, but high requirements for ore and low production efficiency, resulting in a great waste of resources. Gravity separation is purification based on the density difference between barite and associated minerals. The raw ore is crushed and ground to a certain grain grade and then separated by gravity separation equipment so as to remove gangue. The content of barium sulfate in Hengnan barite ore is more than 92% after gravity separation, and the gravity concentrate with barium sulfate content of 84.50% can be obtained after gravity separation of hand-separated tailings. Magnetic separation is to use the magnetic difference between different ores, under the action of magnetic force to select other methods. Magnetic separation is mainly used to remove some magnetic iron oxide minerals such as siderite, which is usually used in conjunction with gravity separation to reduce the iron content of barite concentrate.
2. Chemical purification
2.1 Purification by flotation
With the continuous development and utilization of high grade easily selected barite ore, it is urgent to increase the intensity of research and development of low grade barite ore. Barite is often closely associated with fluorite, calcite, quartz and other minerals, which has low grade, fine dissemination size and complex composition. Traditional gravity separation technology is difficult to effectively separate barite. Flotation has become the main method of barite selection at present because it can adapt to all kinds of complex distribution types of barite. Collector is the key to the effective separation of barite minerals. Commonly used collectors can be divided into three types according to the adsorption form:
① Anion collector based on chemisorption;
② cationic collector based on physical adsorption;
③ Amphoteric collectors in between. According to the separation process of barite and fluorite can be divided into two kinds: one is to inhibit the flotation of fluorite by barite; The other is to inhibit fluorite flotation of barite.
2.2 Calcination purification
The process of mineral calcination is a physical process of pyrolysis from one solid phase to another solid phase and gas phase by heat dissociation to a mineral with simpler composition or crystal transformation of the mineral itself. Because of the impurities such as Fe2O3, TiO2 and organic matter mixed with barite minerals in the process of forming the bed, these impurities will make barite gray, green and blue, so as to affect the purity and whiteness of barite, seriously reduce the use value of barite. Calcination can make organic matter volatilize. Calcination is mainly suitable for removing impurities that can decompose or volatilize at high temperature.
2.3 Extraction and purification
Leaching purification is mainly used to remove carbon and colored impurities in barite. Their presence affects the whiteness and application prospect of barite concentrate. The main methods to remove these impurities are: acid leaching, oxidation – reduction, organic acid complexation. Acid leaching method is the use of acid and mineral impurities metal or metal oxide reaction, to produce soluble in water or dilute acid compounds, through washing and filtration, the soluble matter will be removed, can achieve the purpose of purification. The whiteness of barite powder can be increased from 84.10% to 88.60% by leaching of barite ore with concentrated sulfuric acid. Oxidation-reduction method firstly adds oxidant to dissolve the associated metal compounds in minerals, oxidizes the chromic organic compounds in barite, and then adds reducing agent to reduce Fe into Fe to dissolve it, so as to achieve the purpose of removing impurities and whitening and improving mineral grade. Organic acid complex method is to add organic acids such as EDTA, ascorbic acid, citric acid and oxalic acid in the process of iron removal. Such acids can dissolve iron oxides and form complexes to achieve a good effect of iron removal.
Main use
| As a non-renewable resource, barite is one of the dominant mineral products exported by China. It is widely used as a weighting agent for oil and natural gas drilling mud. The consumption of barite in barium chemical industry, filler and other fields is also increasing year by year. China is rich in barite resources, which are distributed in 21 provinces (autonomous regions) across the country. The total reserves of ore are 360 million tons, ranking first in the world. It can be used medically as a contrast agent in the digestive system. | |||
| Drilling for oil and gas Wells Circulation mud weights in rotary drilling cool the drill bit, carry off the cut debris, lubricate the drill pipe, seal the hole wall, control the pressure of oil and gas and prevent the well from blowout, Chemical production of barium carbonate, barium chloride, barium sulfate, barium zinc, barium hydroxide, barium oxide and other barium compounds These barium compounds are widely used in reagents, catalysts, sugar refining, textile, fire prevention, all kinds of fireworks, synthetic rubber coagulant, plastics, pesticides, steel surface quenching, fluorescent powder, fluorescent lamp, solder, oil additives, etc. Glass deaerating agents, clarifying agents and fluxes increase the optical stability, luster and strength of glass. Rubber, plastics, paint fillers, brightening agents, aggravating agents, building concrete aggregates and paving materials are used to compress buried pipes in swamp areas instead of lead plates for shielding nuclear facilities, atomic power plants, X-ray laboratories and so on to extend the life of pavement. |
Additional information
| Weight | 24 kg |
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| Dimensions | 12 × 48 × 62 cm |
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