Method for preparing low-clinker cement from suspension roasting and coal gasification slag
A technology of clinker cement and coal gasification slag, which is applied in the direction of cement production, etc., can solve the problems of geological disasters, waste of coal resources, environmental pollution, etc., and achieve the goals of reducing carbon emissions, good economic and social benefits, and reducing the amount of clinker Effect
Active Publication Date: 2018-06-22
HUNAN UNIV OF SCI & TECH
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Problems solved by technology
Coal gasification slag has undergone a thermal history with a temperature as high as 1300-1700 ° C. After cooling, it is in a glassy state, and it contains a lot of unburned coal. Direct storage and discharge not only occupy a large amount of land, but also lead to the risk of environmental pollution and geological disasters. causing a waste of coal resources
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[0015] The present invention will be further described in detail through specific examples below, but the present invention is not limited thereto.
[0016] It should be noted that the "coal gasification slag" in this article refers to various gasification ash obtained after being treated in various gasification furnaces in the form of coal-water slurry or coal powder, but is not limited to the above-mentioned gasification ash, and is also applicable to Other process by-products must contain carbon-containing ash.
[0017] The silicon-aluminum oxide involved in the embodiment has 5 kinds of natural rocks, a kind of coal gangue and a kind of mine tailings, and their main chemical composition is shown in Table 1; Industrial alkali raw material has used NaOH and NaOH 2 CO 3 , both of which are analytically pure; the Portland cement clinker used is provided by Sinoma Xiangtan Co., Ltd.; the gypsum used includes five kinds of natural dihydrate gypsum, desulfurized gypsum, building...
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The invention discloses a method for preparing low-clinker cement from suspension roasting and coal gasification slag. The method includes the steps of mixing industrial base, sialic oxide and coal gasification slag in proportion, grinding the materials till mixed powder of the granularity all pass through a 100-mesh sieve, conducting suspension roasting on the mixed powder in a pressurized roaster at 700-1000 DEG C, and adding silicate cement clinker and gypsum to the cooled roasted material in proportion to be evenly mixed and ground till the residual amount of the materials of the granularity is smaller than or equal to 10% after the materials pass through a 200-mesh sieve to obtain the low-clinker cement. When the coal gasification slag is disposed at low cost to prepare the low-clinker cement by means of the method, economic benefits and social benefits are both achieved.
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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IPC IPC(8): C04B7/06C04B7/24C04B7/44
CPCC04B7/06C04B7/24C04B7/44Y02P40/10
Inventor 彭美勋马洪超肖秋国张欣宋飞谢春霖曾令平王成陈欣慧李培
Owner HUNAN UNIV OF SCI & TECH