58results about How to "Has recycling value" patented technology

The invention relates to a method for preparing hydrogen in process of producing manganous-manganic oxide through electrolytic manganese metal and belongs to the field of chemical metallurgy. The preparation method comprises the following steps: crushing the electrolytic manganese metal in the process of producing the manganous-manganic oxide by taking the electrolytic manganese metal as a raw material, reacting the electrolytic manganese metal with water to generate manganese hydroxide under specific conditions under the catalytic action of a catalyst, and releasing the hydrogen, wherein the specific reaction conditions in the process of preparing the hydrogen are that the crushing particle size of the electrolytic manganese metal is less than 150 microns, the addition amount of the catalyst is 5-15g of catalyst added into each 1000g of electrolytic manganese metal, the reaction temperature is controlled to be 40-90 DEG C, and the PH value of the reaction process is controlled to be 6-12. The manganese hydroxide generated through the reaction is prepared into a manganous-manganic oxide product through other oxidation processes, and the hydrogen concentration of the hydrogen released from the reaction can reach 80-90 percent, and the hydrogen becomes a final gas product. The added catalysts are ammonium chloride, ammonium sulfate, hydrochloric acid, manganese chloride and oxalic acid and also comprise two or more catalysts.

The invention relates to a heavy metal recycling method based on municipal solid waste incineration (MSWI) fly ash in the technical field of treatment for environmental protection. After an alkali solution and hydrazine substances are added to the MSWI fly ash and heated, and a water-soluble aluminum salt solution is further dripped; finally, after solid and liquid separation is conducted, heat treatment is carried out on an obtained solid phase to obtain a zeolite-active alumina compound absorbant; and the absorbant is put into sewage full of heavy metal to absorb and recycle the heavy metal. In the preparation process of the absorbant provided by the invention, dioxin in the MSWI fly ash is decomposed and removed; the MSWI fly ash is recycled as resources, and the heavy metal in the MSWI fly ash and the heavy metal in the sewage are recycled as the resources; and because the dioxin is decomposed and removed and the heavy metal is also extracted, the recycling method provided by the invention is safer and more reliable compared with the traditional treatment manner.