TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Method: The medical waste from different sources are collected and respectively put in different waste containers, where large amount of recyclable materials are collected separately. Waste is crushed in a sealing device, where the inside of sealing crushing device is provided with UV sterilizing lamp. The method comprises introducing steam to sterilizing tank containing waste, where temperature of steam is 138-160 degrees C, pressure is increased to 4-8 atm, and duration is 20-50 minutes. Classifying the medical waste comprises magnetic separation using magnetic device to separate magnetic material and recycling the magnetic material as metallurgical material; air separation for separating and treating light material, which is mainly fiber and other organic material, and washing and crushing the light material for use as composites for construction; gravity jigging, separating and treating heavy materials, which are mainly inorganic minerals like sandstone, where material with high metal content can be separated by further separating techniques for use as metallurgical material, and other material can be used as building materials or be buried. The method comprises classifying the secondarily crushed first kind of material by gravity jigging, separating the heavier material, and putting them into the second kind of light material, which is secondarily classified; classifying the secondarily crushed second kind of material by mining-selecting method; and separating the heavier material for use as metallurgical material; and classifying the secondarily crushed third kind of material by mining-selecting method, where separated ore concentrates are used as metallurgical materials, and mine tailings are put into the secondarily classified lighter material.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: Combustion improver, stabilizing agent, oxidizer, and/or anti-smoke agent are added, while the first kind of material is prepared into solid fuel blocks. Preferred Component: The combustion improver is potassium nitrate, magnesium nitrate, sodium chloride, sodium nitrate, potassium permanganate, magnesite, and/or potassium perchlorate. The stabilizing agent is barium nitrate, magnesium nitrate, calcium oxide, magnesia, and/or sodium carbonate. The oxidizer is peroxide, nitric acid, sodium dioxide, potassium peroxide, and/or magnesium peroxide. The anti-smoke agent is sodium hydroxide, potassium hydroxide, zinc nitrate, potassium perchlorate, quicklime, calcium nitrate, and/or lithium nitrate.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The binder is starch, swelling soil, and/or loess.