Lignite comprehensive utilization microwave extraction environment-friendly device and process

Abstract

The invention discloses a lignite comprehensive utilization microwave extraction environmental protection device and process, the device comprises a wet type pulverizer and a spiral classifier; the wet type pulverizer is connected with the spiral classifier, wherein the spiral classifier is respectively connected with a first storage tank and a second storage tank. The first storage tank is sequentially connected with a first microwave extractor and a first plate-and-frame filter, and the first plate-and-frame filter is connected with a first condenser; the second storage tank is sequentially connected with a second microwave extractor, a second plate-and-frame filter, an acidolysis tank, a settling pond and a third plate-and-frame filter, a material inlet of the acidolysis tank is connected with a material outlet of the acid storage tank, a liquid outlet of the third plate-and-frame filter is connected with a liquid medicine pond, and a filter residue outlet of the third plate-and-frame filter is connected with a first microwave dryer; the first plate-and-frame filter is sequentially connected with the second microwave dryer, the mixing mill and the pyrolyzing furnace, the furnace top of the pyrolyzing furnace is connected with the separator, and the furnace bottom of the pyrolyzing furnace is connected with the third condenser. The process comprises lignite wax extraction, humic acid extraction and pyrolysis.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to an environmental protection device and process for comprehensive utilization of microwave extraction of lignite. Background technique [0002] In my country, lignite reserves account for 55% of the total coal, and lignite is rich in montan wax and humic acid. Montan wax is a raw material for the manufacture of coatings, paints, rubber additives, lubricating oils, high-grade wax paper, and cosmetics. The humic acid extracted from lignite can be used as organic fertilizer, compound water-retaining agent, which can improve soil and promote the growth of crops. Humic acid can be used as an adsorbent for heavy metals in sewage treatment. In various deep well drilling, humic acid from lignite can be used as a mud regulator. From lignite, organic chemical raw material tar and light oil, high-quality power fuel and gasification raw material semi-coke, coke ov...

AI Technical Summary

Problems solved by technology

The existing humic acid extraction process is extraction after drying. Because lignite contains about 30-60% of moisture, most of which is capillary moisture, it can only be dehydrated by heating and evaporation. The traditional drying method is to use a rotary kiln to indirect It is heated by contact with lignite, and the water evaporates and dries, but lignite has a low ignition point. During the drying process, local overheating often causes coal quality to deteriorate, and the valuable components in lignite are destroyed, and the control is not good. It will also cause an explosion. The energy consumption of this process is particularly high, which violates the purpose of energy saving and emission reduction.

The existing extraction process of montan wax is to use benzene and xylene organic solvents for extraction. The extraction agent is a flammable, explosive and volatile raw material, which has a great impact on the environment. Once it leaks, it will cause an explosion hazard.

Images