A kind of modified coal tar pitch material and its preparation method and application

Abstract

The invention discloses a modified coal pitch material as well as a preparation method and an application thereof. The modified coal pitch material is composed of the following components in parts by weight: 100 parts of raw coal pitch, 100 parts of water, 0.1-1 part of stabilizing agent and 1-20 parts of Fenton reagent. The preparation method comprises the following steps: fully freezing the rawcoal pitch at the brittleness temperature; smashing and screening to obtain coal pitch powder of which the granularity is less than 80 meshes; adding the water and the stabilizing agent; dispersing by virtue of a blender at the revolving speed of 1000-5000 rpm (revolutions per minute) to obtain a suspension, and then controlling the revolving speed at 1000-5000 rpm; dripping the Fenton reagent atconstant temperature, and reacting at room temperature for 30-90 minutes after the Fenton reagent is added to obtain the modified coal pitch. The content of carcinogen benzopyrene in the modified coal pitch prepared by the preparation method at constant temperature is greatly lowered, the coking value is higher, energy is saved, and consumption is reduced. The modified coal pitch material can be used for preparing a magnesia carbon brick binder and a road paving material after being simply processed, thereby avoiding environmental pollution. In addition, the preparation method is simple.

Description

technical field [0001] The invention relates to a modified coal tar pitch material used for paving roads and bonding magnesia-carbon bricks, as well as a preparation method and application thereof. Background technique [0002] Coal tar pitch is the bulk product of coal deep processing. my country is a large coal country, and the output of coal tar pitch has reached 2.5 million tons. Therefore, the development and utilization of coal tar pitch has always been a subject of concern to researchers. Coal tar pitch can be used as binder for road paving materials, carbon material binder, coating and magnesia carbon brick bonding material, etc. However, because it contains more fused-ring aromatic hydrocarbons, benzopyrene is carcinogenic, so it was first restricted from use in Europe in view of environmental protection requirements in the 1990s. In recent years, with the increasing shortage of petroleum resources, the development and utilization of coal tar pitch has become the g...

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Problems solved by technology

For example, the first issue of "Coal Chemical Industry" in 2007 reported on pages 58 to 60 entitled "Research on Reducing 3,4-Benzopyrene in Coal Tar Pitch with Polymer Reagents". This method uses polymers to reduce carcinogens through high-temperature reactions. Content method, but the temperature is as high as 270 degrees, which will easily lead to performance degradation

In 2007, "Current Science" volume 93, No. 4, page 540-544 reported the title "Modification of coal tar pitch by chemical method to reduce benzo(a)pyrene". A chemical reaction occurs in the presence of oxides, the reaction temperature is 115 to 160 degrees, the reaction time is more than 7 hours, and nitrogen protection is required. This method has a lower temperature than the previous method, but there are unfavorable factors such as long reaction time and harsh conditions.

In 2005, "Refractories and Industrial Ceramics" Volume 46, Issue 4, Page 291 reported the product named ANKERSYN. The key technology lies in the high-temperature vacuum preparation step to obtain mesophase pitch with a softening point greater than 200 degrees, and then obtain the softening point by adding solvent Magnesia-carbon brick adhesive at 90 to 110 degrees, this product has the characteristics of high coking value and low toxicity, which meets the German standard, but this method has disadvantages such as high-temperature vacuuming and other complex processes

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