A method for supercritical deashing using five-membered ring structure amidine group polyamidine

Abstract

The invention discloses a method for carrying out supercritical deashing through five-membered ring structure amidine group polyamidine. The method comprises the steps that a coal raw material and pickle liquor are mixed, wherein the pickle liquor at least comprises one kind of acid and polyamidine with a five-membered ring structure amidine group; the pressure and temperature of the mixture are controlled to enable the mixture to be in the supercritical state for deashing. The selected polyamidine has the good flocculation effect, is good in heat stability, low in toxicity and high in electric charge density, and enables deashing mixed acid containing hydrofluoric acid not to volatilize easily in the deashing process, so that the deashing effect is obviously improved, energy consumption is lowered, the cost is saved, and meanwhile environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical deashing methods for coal, and in particular relates to a supercritical deashing method using a polymer containing five-membered ring polyamidine. Background technique [0002] my country's coal resources are abundant and complete in variety, but the content of inorganic minerals (ash) is high, which limits its wide application in industry to a certain extent. In particular, the application of coal in the fields of carbon electrode manufacturing, graphite products, activated carbon, high-temperature lubrication, and petroleum substitution for internal combustion engines has put forward higher requirements for the ash content of coal. The storage and transportation of high-ash coal also has the problem of high cost consumption. Therefore, the development of coal deashing technology has become a clean coal technology that has been extensively studied for a long time. [0003] At present, the meth...

AI Technical Summary

Problems solved by technology

The physical method uses the difference in properties between inorganic minerals and coal to rely on gravity or surface affinity for separation, such as dense medium method and flotation method. Physical methods generally require multiple washings to obtain clean coal with low ash content, and the yield is not high. High, and the deashing effect is highly dependent on the nature of the sample itself; the chemical method is to use acid or alkali to react with inorganic minerals to achieve the purpose of deliming, such as hydrochloric acid, hydrofluoric acid pickling and alkali fusion method, in the chemical method, hydrochloric acid pickling is only It can wash away calcium, iron and other acidic substances, but has no effect on silicon in quartz, and the deashing rate is low. Due to the complicated process and high cost, its development is limited