method of liquefaction of inflammable minerals

Abstract

The method of inflammable minerals liquefaction is related to the technology of producing synthetic liquid fuel and can be applied to the processing of any kinds of fossil power-generating raw materials into various inflammable liquid products. The object of the present invention is to ensure a complex utilization of the initial power-generating raw material, to intensify its processing, to decrease the power consumption of synthetic liquid fuel production and to weaken the harmful impact of the technological process on the natural environment. The method includes initial raw material milling, its hydrogenation in the presence of a catalyst and separation of non-liquefied solid residue from synthetic oil. However, milling of the initial raw material is carried out in two stages in an aqueous solution of mineral salts catalyzing hydrogenation, which is saturated to an intermediate density between those of inflammable mineral and waste rock. In the course of milling accompanied by the release of methane into gaseous phase, which is capped for its further utilization, inflammable minerals floating to the surface from the milling zone are separated from non-inflammable impurities. A suspension of the light product of the first milling stage is heated and fed to the second milling stage. The light product of the second milling stage is squeezed from excessive liquid phase, mixed with hot paste-forming agent, diluted with an organic diluent, ground to the colloidal size and fed to hydrogenation. After that, the remaining non-liquefied residue is washed with an organic diluent, dried and mixed with dehydrated heavy product of the first milling stage. The obtained mixture is washed with water and withdrawn from the process, whereas the remaining washing water discharge is evaporated and returned to the first milling stage. Meanwhile, the heavy product of the second milling stage is dehydrated, cooled and returned to the starting point of the process. Zinc and tin chlorides, iron sulfates, ammonium molybdates and their various mixtures can be used for preparing the solution, in which the initial raw material is milled, whereas various compositions containing tetraline, anthracene oil, methyl naphthaline and cresol can be used as paste-forming agents. Isopropyl alcohol can be used as a paste diluent, and light petroleum as an organic diluent.

1 . A method of liquefaction of inflammable minerals involving a preliminary grinding of the initial raw material with further mixing of the ground material with paste-forming agent, hydrogenation of its carbon-containing components by attaching hydrogen in the presence of a catalyst and separation of liquid products from non-liquefied solid residue, wherein to ensure a complex utilization of the initial raw material, to increase liquid products output, to decrease the power consumption of the process and to weaken the harmful impact of synthetic liquid fuel production on the natural environment, the preliminary grinding of the initial raw material is carried out in two stages with simultaneous capping of methane released from the destroyed material, in an aqueous solution of mineral salts catalyzing hydrogenation, said solution being saturated to the density intermediate between those of inflammable mineral and waste rock, and separate extraction of light and heavy products after every grinding stage, wherein the suspension of the light product of the first milling stage is heated before the second milling stage, and after the latter, the light product of the second milling stage is dehydrated, mixed with paste-forming agent, diluted with diluent, ground to the colloidal size and fed to hydrogenation; non-liquefied hydrogenation residue is washed with an organic diluent, dried and mixed with dehydrated heavy product of the first milling stage, and the produced mixture is washed with water, whereas the remaining washing water is evaporated to the initial density of the original solution and returned to the first milling stage, while the heavy product of the second milling is squeezed from excessive liquid phase, cooled and returned to the starting point of the process. 
     
     
         2 . A method according to  claim 1 , wherein both individual inorganic compounds and their mixtures forming aqueous solutions with the density sufficient for floating of inflammable components of the processed raw material, such as zinc or tin chlorides, iron sulfates and ammonium molybdates, are used as mineral salts catalyzing the hydrogenation process, whereas organic compounds of the aromatic series representing donors of atomic hydrogen, such as tetraline, methyl naphthaline, cresol and anthracene oil components are used as paste-forming agents.