黑剛玉簡介

      黑剛玉又名低鋁剛玉，在棕剛玉生產中是一個新型派生品種。是于電弧爐中，將鋁礬土熔煉而制得的一種以 α- Al2O3 和鐵尖晶石為主礦相的灰黑色結晶體，其特點是Al2O3 含量較低，并有一定量的Fe2O3（10左右）存在，因而具有硬度適中、韌性高、耐高溫、熱態性能溫定的特點。多用于自由研磨，如制品電鍍前的打磨工粗磨，主要用于不銹鋼，金屬制品，光學玻璃，竹木制品的拋光和噴砂，又是制造樹脂砂輪，切割片，紗布的新穎磨料。用本產品拋光比其它磨料工效提高2.5倍,光潔度提高1.5倍,特別是磨削拋光不銹鋼制品效果更佳。是磨削拋光、噴砂不銹鋼制品的較理想產品。

      黑剛玉具有很好的自銳性，磨削時發熱量少，加工件的光潔度較好，適用于零件電鍍前底面拋光，鋁制品和不銹鋼的拋光，也可用于拋光光學玻璃、加工木材等。由于它的親水性好，可用在制造砂紙、砂布和樹脂磨具，還可以作研磨膏和拋光粉。黑剛玉由于鐵含量高，因而不宜用于制造陶瓷磨具。 黑剛玉的冶煉方法是以三水鋁礬土為原料，不管是黑鋼還棕鋼只要是好鋼就可以加少量還原劑，經溶煉而成，其耗電量約為棕剛玉的三分之二。

Black corundum and low aluminum corundum, brown fused alumina is a new type of derived varieties in the production. Is in electric arc furnace, the bauxite made by melting a is given priority to with alpha Al2O3 and spinel mineral phase of colored crystals, its characteristic is Al2O3 content is lower, and has a certain amount of Fe2O3 (10), thus has moderate hardness, high toughness, high temperature resistant, thermal steady state performance characteristics. More for free grinding, such as the beat of the products before electroplating grinder coarse grinding, it is mainly used for stainless steel, metal products, optical glass, bamboo and wood products polishing and sanding, making resin grinding wheel, cutting slices, gauze of new abrasive. Use the product polishing 2.5 times higher than that of other abrasive efficiency, bright and clean degree increased by 1.5 times, especially the effect of grinding and polishing stainless steel products is better. Grinding polishing, sandblasting of stainless steel products is the most ideal products.

Black corundum has the very good self-sharpening, calorific value, less when grinding roughness of machined part is good, suitable for the floor polishing, prior to the plating aluminum and stainless steel polishing, also can be used for polishing of optical glass, wood processing, etc. Because of its good hydrophilicity, can be used in manufacturing sandpaper, emery cloth, and resin abrasive, still can make grinding paste and polishing powder. Black corundum due to their high iron content, and therefore should not be used in the manufacture of ceramic grinding tool. Black corundum smelting method based on sanshui bauxite as raw material, whether it's black steel brown steel as long as is good steel can also add a small amount of reducing agent, the smelting, its power consumption is about two-thirds of the brown fused alumina.

黑剛玉工藝流程

      黑剛玉的加工制粒過程比較復雜，沒有掉色，染色都是好產品采用電熔干法加工，工藝流程如下：剛玉塊粗碎中碎粉碎分段篩磁選精篩檢查包裝。黑剛玉呈黑色，主要化學成分：Al2O3不低于77，SiO2含量為1012，Fe2O3含量為710，TiO2約為3，比重不小于3.61.。 我國對黑剛玉的化學成分，粒度組成、磁性物含量和顆粒密度都有國家標準規定，耐火材料部門使用的黑剛玉，一般參照國家標準，再結合自己產品的質量要求，選擇加工好的剛玉料，黑剛玉磨料可以按照耐火材料生產的常用顆粒成分、雜質的限定含量進行加工處理。

Black corundum processing and granulating process is complicated, no fading, staining is a good product adopts fused dry processing, the process flow is as follows: corundum blocks, coarse crushing, crusher, crushing, segmented sieve, magnetic separation, fine screen - check - packing. Black corundum in black, the main chemical composition: not less than 77 Al2O3, SiO2 content of 10-12, Fe2O3 content of 7 10, TiO2 is about 3, the proportion of not less than 3.61. Our country on the chemical composition of black corundum, granularity composition, content and particle density of magnetic material has the standard provisions of the state, use black corundum refractory material department, general reference to national standards, coupled with their product quality requirements, choose good corundum material processing, black corundum abrasives can be produced according to the refractory common particle composition, process the limited content of impurities.

黑剛玉用途

      1.用于自由研磨，如金屬零件電鍍前底面拋光、鋁制品。

      2.可用于研磨如：自行車、摩托車、縫紉機、鐘表零部件。

      3.黑剛玉粒度砂和微粉特別適合于不銹鋼工件的研磨拋光及研磨膏、油石的制造。

      4.黑剛玉可用于塑膠及五金工具、燈飾等的拋光，也適用于噴砂（玻璃噴花、除銹）。

      5.黑剛玉做加工材料，制造樹脂切割片、涂附磨具和角磨片等。

      6.黑剛玉段砂也是煤礦坑下倉儲和防滑路面的優選材料。

      黑剛玉在生產過程中往往會根據不同的客戶需要進行篩分出不同的種類，而且篩分過程中往往需要通過提升機通過黑剛玉篩分輸送管道輸送至篩分機進行篩分，從而篩分出不同粒徑的黑剛玉，而待篩分黑剛玉段砂在相互篩分時，往往由于摻雜大量的微粉等微小顆粒物，由于微小顆粒與顆粒之間具有一定的吸附作用，所以在篩分時，顆粒相當的可以在篩分機進行篩分，但是微粉、塵土等微型雜質則不能進行篩分處理，進而流出到篩分后的段砂中，這些微粉、塵土的存在不僅影響篩分后段砂的色澤和光潔度，而且降低了段砂使用時的粘結性。

1. Used for free grinding, such as floor polishing before plating metal parts, aluminum products.

2. Can be used for grinding, such as: bicycle, motorcycle, sewing machine, clock parts.

3. Black corundum sand particle size and powder particularly suitable for the grinding and polishing of stainless steel workpiece and grinding paste, oil stone manufacturing.

4. Black corundum can be used for plastic and hardware tools, lamp act the role ofing, such as polishing, also applies to sandblasting (glass spray flowers, scaling).

5. Black corundum do processing materials, manufacturing resin cutting piece, coated abrasive, Angle grinding, etc.

6. Black corundum sand and coal mine under storage and antiskid pavement material of choice.

Black corundum in the process of production tends to screening out to meet the need of different customers different kinds, and often need to pass in the process of screening hoist by black corundum sieve pipeline conveying to the sieving machine for screening, and screening out the different size of the black corundum, and for screening black corundum sand at each screen, often due to doping of powder particles, such as small particles and the particles have a certain adsorption between, so at screen, the particle is quite can undertake screening in screening machine, but the micro powder, dust and other micro impurities are not for screening process, and then out to the screen after the period of sand, the presence of these micro powder, dust affects not only after screening sand color and finish, and reduces the period of sand when using the caking.

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