Ash residue treatment method and autoclaved brick manufacturing method

Abstract

The invention discloses an ash residue treatment method and an autoclaved brick manufacturing method, relating to the technical field of catalytic coal gasification and aiming at solving the problem of very low comprehensive utilization ratio of useful components in ash residue. The ash residue treatment method comprises the step of treating the ash residue to be treated by using a digesting agent and washing liquor. The autoclaved brick manufacturing method comprises the steps of pressing the ash residue treated by the ash residue treatment method into an autoclaved brick green body, and carrying out steam press maintenance on the autoclaved brick green body to obtain an autoclaved brick. The ash residue treatment method and the autoclaved brick manufacturing method have the beneficial effects that the ash residue is treated to obtain a catalyst and an autoclaved brick raw material in the ash residue, the autoclaved brick raw material is manufactured into an autoclaved brick, and the comprehensive utilization ratio of the useful components in the ash residue is improved.

Description

technical field [0001] The invention relates to the technical field of coal catalytic gasification, in particular to an ash treatment method and an autoclaved brick manufacturing method. Background technique [0002] Catalytic coal gasification refers to the catalytic gasification reaction of pulverized coal and water vapor under the conditions of medium-low temperature and high pressure, through the catalytic action of alkali metal catalyst, to generate CH-rich gas. 4 Gas and a lot of ash. Since coal powder is catalyzed by alkali metal catalysts for catalytic gasification, the ash generated after coal catalytic gasification is rich in alkali metal catalysts and elements such as iron, calcium, silicon, and aluminum. [0003] In order to make full use of the useful components contained in the ash, in the prior art, the utilization of the ash generally adopts the methods of calcination and acid and alkali dissolution to extract alumina and rare metal Ga from the ash, such as ...

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Problems solved by technology

[0003] In order to make full use of the useful components contained in the ash, in the prior art, the utilization of the ash generally adopts the methods of calcination and acid and alkali dissolution to extract alumina and rare metal Ga from the ash, such as patent CN 103349994A, The ash treatment methods mentioned in CN103351014A and CN 103991898A, looking at these methods, because they only realize the recycling of alumina and rare metals in the ash, they cannot recycle the residual alkali metal catalysts and slag in the ash. About 80% of the total mass of ash contains silicon, iron, calcium and other elements, which makes the comprehensive utilization rate of useful components in ash very low

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