Chopped Graphite/Graphite Electrode in different materials have different definition of graphite pieces, some data and literature is not very big graphite particles are called graphite pieces (such as Graphite Powder) some is graphite products have a certain size, for graphite broken into patches, we here say of graphite for a second, usually called graphite blocks. Graphite is produced from graphitization and machining process of graphite products. It is used as additive and conductive material in the manufacture of graphite waste in steel and foundry industries, and can also be processed according to customer's requirements. They are also widely used in electric arc furnaces (steelmaking) and electrochemical furnaces (metallurgical and chemical industries).
Main use of graphite
Graphite pieces due to its low ash content, conductive and heat conduction performance is good, so there are a wide range of USES, can be added to the formula of less ash or dust products, graphite broken broken into small particles commonly use. Ingredients to add a certain amount of graphite, the plastic paste after kneading, especially during extrusion can reduce the friction resistance paste to squeeze the mouthpiece, to improve the coefficient of pressure type. Graphite pieces of coal adsorption properties of asphalt is better, to join the carbon block can rise to reduce the "short" waste (i.e., the product after roasting top produce honeycomb structure), and can improve the thermal conductivity of the carbon block and alkali corrosion resistance. The electrode paste used in hermetically-sealed thermal furnace is added to a certain amount of graphite to increase the conductivity and thermal conductivity of the electrode paste and accelerate the sintering speed of electrode paste. When the graphite is ground into small particles or fine powder, it is also used as raw material for the production of graphite chemical equipment (such as graphite-resin tubes). The graphite can also be used as a carbon addition agent for the electric furnace.
Graphite classification
1. Raw and broken. It is a raw blank that is not qualified after molding.
2. Roasting is the cutting debris that is recovered after the roasting of raw billet and after inspection of unqualified waste and the processing of calcined products.
3. The graphite is broken, and it is inspected by the graphite-producing waste and the cutting debris produced by graphite products in the process of processing.
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Big chestnut iron ore Eastern sedimentary metamorphic iron ore deposit. Since 1970, the No. 6 and No. 6-0 ore bodies have been mainly mined. The two are parallel, with a length of 100-150 m, a thickness of 6-15 m, a dip angle of 30°, and a grade of 30-48%. The ore is moderately stable, and the surrounding rock of the top and bottom plates are all marbles , which are moderately stable. Only the direct roof of No. 6 ore body is 0.2 m thick phyllite. It is mainly mined by the method of retention. The mine is 30 to 50 m long, the top column is 4 m high, and the bottom column is 6 to 8 m high. Since 1979, attention has been paid to the recovery of pillars. In 1980, the amount of ore produced from the top and bottom columns reached 79.8% of the total ore produced in the area. There are empty areas around the top and bottom columns, and there are some falling rocks. In the past, the use of medium and deep hole mining top and bottom columns, due to unclear boundaries, improper design and construction of blastholes, not only the ore depletion and loss during blasting, but also large blocks, difficult to mine, most of the ore did not release the roof The recovery rate is extremely low.
Later, the mining method was used to recover the top bottom column (Fig. 1). In order to ensure the safety of the operation, the following mining sequence and measures are adopted: 1. The top and bottom columns are divided into small strips along the strike, and the strips are sequentially returned in the backward manner. The vertical direction of the striping is from the bottom to the upper disc (or vice versa), and the exposed area is generally controlled at about 50m; (2) the mining layer is 2m high, and the horizontal blasthole is used for mining. The last layer is 3m high. If there is a waste rock in the upper part, leave 1m thick ore. As the ore is released and the suspended roof distance increases, the ore will naturally fall and the working surface pressure will be reduced. (3) The working face support will be strengthened by using rafts and columns. Using the above measures, a large number of ore were produced in a few years without casualties, the recovery rate was 67.3%, the depletion rate was 10%, and the recovery rate was increased by 20 to 31% compared with deep hole recovery.
Figure 1 Using the retention method to recover the top and bottom columns