Method for preparing cementing material from suspended roasted coal gasifying slag

Abstract

The invention discloses a method for preparing a gel material from suspended roasted coal gasifying slag. The method is characterized in that industrial alkaline, silicon-aluminum oxide and coal gasifying slag are uniformly mixed in proportion and are grinded to completely pass through a 100-mesh sieve; then, mixed powder is suspended and roasted in a temperature being 700-1000 DEG C in a pressurizing roasting furnace; and finally, lime and gypsum are added in proportion into the cooled roasted material, and are finally grinded until 200-mesh weight of screen residues is smaller than or equalto 10%. The method is used for preparing the gel material from the coal gasifying slag, and has economic and social benefits.

Description

technical field [0001] The invention belongs to the fields of environmental protection and building materials and their applications, and in particular relates to a coal gasification slag treatment and utilization technology. Background technique [0002] With the rapid development of my country's industrial economy, based on my country's primary energy structure characteristics of "rich coal, poor oil and little gas", the coal chemical industry, which mainly synthesizes and produces various chemical products and fuel oil, has developed rapidly. Coal gasification technology is the basic technology and key technology for the development of coal-based chemical synthesis, liquid fuel synthesis, advanced combined cycle power generation (IGCC), polygeneration, hydrogen production, direct reduction ironmaking and other industries. With the development of coal gasification related industries, the ash discharged from the gasification process is increasing day by day. According to p...

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Problems solved by technology

Coal gasification slag is composed of common rock-forming elements. After a thermal history with a temperature as high as 1200-1700 ° C, it is in a glassy state after cooling, and contains more than 20% of unburned coal. Direct storage and discharge not only occupy a large amount of land , lead to the risk of environmental pollution and geological disasters, and cause a waste of coal resources

Because the carbon contained in it has poor strength and is difficult to remove, coal gasification slag is not suitable for direct use as building materials. At present, except for landfill or open-air stacking, it can only be used for simple applications such as roadbeds and mine backfills. Others such as ceramics The amount of raw materials used is small, and the processing capacity is limited, which is not enough to absorb a large amount of rapidly growing coal gasification slag

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