Uranium ore suitable for acid heap leaching, mainly silicate rock type ore mixed with a small amount of carbonate rock type ore. According to a simple mineral fraction, mainly quartz, feldspar, smectite, muscovite mica and water, amber mica, apatite, fluorite, siderite iron ore, magnesite and uranium minerals; if divided by the mineral composition, most silicon aluminates and silicates, aluminum silicates and carbonates, carbonates. The table below lists the main mineral types in the ore when acid leaching a uranium ore, and the elements of the various minerals supplied to the leachate during the leaching process. Main scale components and sources of uranium ore heap leaching Supply to leachate Elemental mineral species quartz Feldspar Green earth Green earth Mica Muscovite Siderite Lithium iron mica Siderite Amber mica apatite fluorite apatite Calcite Asphalt uranium mine Hydrous uranium ore Precipitate formed by increased ion concentration due to evaporation (in acidic solution) Not appearing Ranunculus Water green Permanent solubility Magnesium sulfate plaster Not appearing Due to pH change Precipitated Aluminium SiO 2 ∕Al 2 O 3 For 0.7:20 Sanshui aluminum mine FeO(OH) Fe(OH) 3 Not appearing pH<7 plaster pH>8.4 Calcite Uranyl ion Hydrolyzate Note: chertite Al 2 SO 4 ·18H 2 O; water green 矾FeSO 4 ·7H 2 O; water-soluble magnesium sulfate MgSO 4 ·7H 2 O; gypsum CaSO 4 ·2H 2 O; gibbsite SiO 2 ·Al 2 O 3 ·nH 2 O; gibbsite Al(OH) 3 ·3H 2 O; calcite CaCO 3 . As can be seen from the above table, the elements entering the leachate and the scale-forming components are closely related to the type of minerals in the ore. The general situation is: smectite-layered silicates, including mica, hydromica, chlorite, montmorillonite, which is aluminum in the leachate. The main source of silicon; the lithium iron mica and amber mica of the carbonates of the siderite, magnesite and aluminosilicate are the main sources of iron and magnesium ions in the leachate; while the fluorite and apatite and calcite are The main provider of calcium ions. Aluminum, iron and calcium are the main factors causing fouling in acid heap leaching. The leaching and precipitation of silicon is a bit special. The following is a discussion of individual elements. First, aluminum The leaching from the aluminosilicate is present in all scales, and the aqueous sulfate of aluminum predominates in the scale deposited on the surface of the heap due to evaporation. In the near-neutral precipitate of the leachate, aluminum is divided by allophane (SiO 2 ·Al 2 O 3 ·nH 2 O), and it also appears in the form of hydroxide, and the amount is still large. However, it has rarely been found that aluminum is present in the scale as a simple aluminum compound. In short, aluminum is often mixed with elements such as silicon and iron to form gibbsite or ferrous amphibole and hydrated aluminite. Second, iron It is from the aluminosilicate of the ore (such as lithium iron mica), but also from the carbonate (such as siderite) into the leachate. On the surface of the heap due to evaporation, even if the pH is 1, iron can be crystallized together with gypsum in the form of water-containing green strontium (ferrous sulfate); in the interior of the heap, the iron in the sediment initially appears in the form of molten aluminite. The rest of the iron is deposited on the aluminite in the form of goethite, tetragonal fibrite, and fibrite. When the acid of the leachate is gradually consumed and the pH is raised to 3 to 5, the ferric iron in the solution precipitates as a hydroxide, which occurs mostly at the bottom of the heap. In many experiments and some heap leaching fields, the slag grade of the uranium in the lower part of the heap is higher than the original ore grade, and the iron slag grade is also higher than the original grade. The surface of the ore accumulates a thick yellow precipitate, the result of hydrolysis of iron and uranyl ions. Third, silicon Mainly from the water mica, chlorite, montmorillonite and Other clay minerals into the leachate, and rarely dissolved from quartz, feldspar. As the acidity of the solution decreases, silicon and aluminum form a hydrated aragonite, or together with aluminum and iron, form aluminite. The formation of allophane is before iron precipitation. The formation of allophane makes the silicon in the leaching solution low in content, so that the mineral of silicon is rarely found in the crystallized product evaporated by the leaching solution. Fourth, calcium It is from the fluorite and apatite into the leachate. In acidic conditions, sulfate ions in the calcium and leachate form gypsum, and only a part of calcite-calcium carbonate is formed when the pH reaches 8.4 or higher. When the amount of fluorite contained in the ore is high, calcium sulfate scaling is a more troublesome problem in acid uranium heap leaching. Due to evaporation, the surface of the heap is often a white gypsum deposit, and white gypsum deposits are everywhere in various reservoirs and pipes. V. Uranium The uranium mineral dissolves into the leachate, and its dissolved amount in the acidic solution is large. Only when the acidity of the solution is lowered to pH 6, the uranyl ion is hydrolyzed to form a hydrate of the uranyl ion. Therefore, from its own, it is impossible to form or exist uranium scale on the surface of the heap unless it is wrapped by gypsum or the like. However, in the interior of the heap, especially in the lower part of the heap, sediments of uranyl ions are often found. In addition, uranium leached from ore is often adsorbed inside the heap by sediments of hydromica, organic matter, and other clays and scales. Product categories of Hex Bolts, we are specialized manufacturers from China, Hexagonal Bolts, Hex Cap Bolts suppliers/factory, wholesale high-quality products of Hex Bolts ,we have the perfect after-sales service and technical support. Look forward to your cooperation! Heavy Hex Bolts,Hex Bolts,Allen Bolt,Allen Key Bolt Kunshan Zhonggu Precision Hardware Co., Ltd. , https://www.zgfastener.com