Technology for molding coke breeze or pulverized coal

Abstract

The invention discloses a technology for molding coke breeze or pulverized coal. The technology comprises the steps of firstly, drying and dewatering coke breeze or pulverized coal and a molding agent component 1 (asphalt) respectively; fully and evenly mixing the coke breeze or pulverized coal with the molding agent component 1 (asphalt), component 2 (quinoline) and component 3 (water) according to a certain ratio at normal temperature; pressing a mixed body of the coke breeze or pulverized coal and the molding agent at normal temperature, so as to obtain a green ware body by molding the coke breeze; carrying out pretreatment on the green ware body at medium temperature to cure the asphalt in the green ware body, so as to obtain a half-cooked body; and sintering the half-cooked body at high temperature to obtain the molded cooked carbon block. The technology has the advantages that the technology has no special demand (less than 2mm) on granularity of the coke breeze or pulverized coal, and is less in dosage of the molding agent, low in cost, simple in technological operation (normal-temperature mixing and normal-temperature pressing), and simple in device requirement (just requiring a blender mixer, a molding machine and a sintering furnace); a medium-temperature processing technology is provided for different subsequent technologies; the strength of the green block is greatly improved; and the carbon block prepared by high-temperature sintering is controllable in strength (adjusting the molding pressure according to the requirements), good in quality uniformity, low in resistivity and high in vacuum degree.

Description

technical field [0001] The invention belongs to the fields of chemical industry and materials, and in particular relates to a powder forming process. Background technique [0002] Petroleum coke is only a by-product of petroleum smelting in the petrochemical industry, and the petrochemical industry does not have strict quality standards for it. With the rapid increase in demand, it is difficult to guarantee the coking time and coking temperature, which is also the source of the current large increase in powder coke [1]. The main hazards caused by the increase of powder coke content in petroleum coke are[2,3]: the impact on the yield of calcination, the carbonaceous burning loss of materials with powder coke less than 1mm is quite serious during the calcination process; the increase of powder coke content in petroleum coke , "blasting" will occur during the calcination of the pot calciner, which will bring great hidden dangers to the safe production of the calcination furnac...

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Problems solved by technology

[0004] Powder coke molding patents [6] and [7] use powder coke and pitch in a certain proportion, heat the mixture to 50-130°C and press it into agglomerates with a molding die. This method has the following problems: due to the use of petroleum For asphalt or tar pitch, it is necessary to "heat the mixture to 50-130°C and press it into a mass with a molding die". needs, but the purpose of improving the utilization value of powder coke cannot be achieved

Patents [8], [9], [10], [11] introduced powder coke molding methods using other types of binders instead of asphalt. The binders used in patent [8] added acid and alkali, bringing in Na and other impurity elements; patents [9] and [10] respectively use polyvinyl alcohol, water glass, bentonite mixed binder and bentonite (pulp) binder. Bentonite and pulp contain a large amount of impurity elements, and the obtained powder coke The block cannot be used in metallurgical industries such as carbon anode production, which has certain limitations, and the pressure used in patent [9] molding is 90MPa, which has high requirements for equipment; the binder used in patent [11] is mixed with a part of cement , it inevitably brings in a lot of impurity elements, and the coke block needs to be dried naturally for 12 days, and the process cycle is too long; the binders used in patents [8]-[11] will bring in a lot of impurity elements, and the coke produced Blocks are only suitable for use as fuel, and the scope of application is narrow

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