Method for producing clean coke based on alumina transition state binder

Abstract

A method for producing clean coke based on an alumina transition state binder, the method is to select silica, limestone and coal liquefaction residue, crush them separately, then add alumina, metakaolin and pregelatinized starch, and mix them evenly through stirring , and then through dry grinding to obtain the alumina transition state binder; select the blended coal, and mix uniformly according to the ratio of the blended coal and the alumina transition state binder, cold press molding, dry distillation in a vertical carbonization furnace, and then After the red-hot charge is released from the furnace, it is cooled to normal temperature through the coke quenching process, and the clean coke is produced; the raw material source of the present invention is wide and abundant, and the price is low. The cold-state binder fails, and the hot-state binder plays a bonding role before it acts, which ensures the molding rate and coke strength of the material in the retort furnace.

Description

technical field [0001] The present invention relates to a production method of clean coke, and also relates to a binder used in the production of clean coke, in particular to an alumina transition state binder used in the production of clean coke and its preparation method and application. Background technique [0002] The special primary energy endowment of some rich coal, poor oil and little gas determines that coal combustion is the main way to obtain energy at present and for a long time to come. serious hazards, resulting in serious air pollution and frequent occurrence of smog; for example, in 2014, China’s statistics for civilian coal consumption was 160 million tons, accounting for only 3.8% of the country’s coal consumption. Taking sulfur dioxide emissions as an example, power plants The annual emission is 2 million tons, and the civil scattered combustion is as high as 3.2 million tons, which is 1.6 times the total emission of power plants; in addition, a series o...

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Problems solved by technology

[0005] At present, there are few patents on powdered coal forming carbonization method. For example, in the publication number CN106635217A, coal liquefaction residue is directly mixed with pulverized coal for molding as its hot and cold state binder; in publication number CN106701133A, pitch and tar residue are used as Dry distillation after binder mixed with pulverized coal to obtain molded coke; Publication No. CN106753496A uses tar slag as the base binder and then supplements with cornmeal and inorganic magnesium salt and then dry distillation; Publication No. CN106929063A uses waste heavy Coal tar pitch, tar residue, polyaluminum ferric chloride are mixed and heated to soften, then dolomite powder is added to obtain a binder, and after being mixed with pulverized coal, the coal is cold-pressed and then dry-distilled to obtain molded coke. These preparations for molded coke The binder used in the patent formula is mainly used in the cold forming process below 200°C and the hot binder in the dry distillation process above 400°C, but there are 200-400°C in the actual dry distillation process. In the stage where the cold binder fails and the hot binder does not work between ℃, due to the lack of use of transition binders in this temperature range, the coke breakage rate is high during the carbonization process.

[0006] After searching, there is no report on the alumina transition state binder used in the production of clean coke

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