39results about How to "Achieving Scale Utilization" patented technology

The invention discloses a sludge dehydration conditioner, which comprises the following components in weight percentage: 30-70% desulfurization ash, 5-15% magnesium salt, 5-30% iron salt, 2-20% aluminum salt, 0.1 ~15% Magnesium Oxide. At the same time, it also provides a dehydration method of the conditioner, including the steps of preparation of conditioner solution, conditioning of sludge, preparation of flocculant solution, sludge dehydration and the like. The raw materials used in the present invention have wide sources, low price, low preparation cost, convenient use, good dehydration effect, can rely on existing sludge dewatering facilities, simple implementation process, and can effectively improve the stability and reliability of the sludge dewatering process It can be widely used in the treatment of various waste water, sewage and sludge.

The invention belongs to the technical field of resource utilization of solid waste, and in particular relates to a method for preparing cement admixture by using engineering waste soil, a cement admixture and a cement composition. The method for preparing cement admixture from engineering spoil provided by the present invention comprises the following steps: crushing engineering spoil to obtain spoil powder; calcining the spoil powder to obtain cement admixture; The spoil includes kaolin, and the content of the kaolin is above 30wt.%. The calcining temperature is 650-700°C. The method for treating engineering spoils in the invention is simple and easy to operate, and the prepared cement admixture can meet the strength requirement of concrete for cementitious materials, and can realize large-scale utilization.

The invention proposes a steel slag-cyanide tailings cementitious material and its preparation method and application. The steel slag-cyanide tailings cementitious material is composed of the following substances in mass percentage: 30-60% of iron-selected waste slag, 10-20% of aerated concrete waste, 15-25% of calcium carbide slag, and 10-30% of desulfurized gypsum %. Carbide slag is calcined, cooled naturally, and ground; aerated concrete waste is crushed, dried, and ground; after desulfurization gypsum is ground, it is mixed with steel slag-cyanide tailings iron selection waste in proportion to prepare steel slag-cyanide tailings cementitious material. The cementitious material is mixed with portland cement to prepare steel slag-cyanide tailings cement. The preparation method of the invention is simple and easy to implement, can realize the coordinated utilization of various wastes, increase the added value of the wastes, reduce the production cost of cement, and has good social and economic effects.

The invention relates to a method for extracting ammonium and modifying electrolytic manganese residue, and belongs to the field of environmental protection. The method comprises the steps: mixing the electrolytic manganese residue with one or more of quick lime, slake lime, carbide slag, steel slag, red mud or other alkaline slag, and heating and calcining the mixture under the condition of 200 to 500 DEG C. By adopting the method, the disadvantage that pollutants are formed in the heating process of the electrolytic manganese residue containing two volatile gases such as nitrogen and sulfur can be ingeniously avoided, the cementitious activity of the heated modified electrolytic manganese residue can be remarkably improved, and the modified electrolytic manganese residue can be used in cement factories, brick factories, concrete mixing plants and the like; more favorable advantages are as follows: the nitrogen element in the electrolytic manganese residue forms ammonia gas which is prepared into ammonia water to be recycled, and the sulfur element is cured in the residue in a form of calcium sulfate to be used as a beneficial cement excitant or retarder component. By adopting the process, the economical performance and environmental friendliness of an electrolytic manganese residue pretreatment method can be improved, an important significance for the recycling of the electrolytic manganese residue in China can be realized, the application prospect is wide, and the market value is vast.

The invention discloses a method for utilizing electricity to gas (ETG). The method comprises the following steps: (1) preparing hydrogen by using water electrolyzed by surplus electricity, and collecting the produced oxygen as a by-product; (2) increasing the pressure of the hydrogen to 0.5-5MPa, and then heating up to 220-350 DEG C; (3) enabling the heated hydrogen to be divided into two parts, inputting one part of hydrogen into a gas mixer, and inputting the other part of hydrogen into a methanation reaction zone; (4) inputting carbon dioxide into the gas mixer to enabled the carbon dioxide to be mixed with the hydrogen; (5) arranging at least four methanation reactors which are connected in series and / or in parallel in the methanation reaction zone, and collecting natural gas at an outlet of the last methanation reactor, wherein the surplus electricity comes from the abandoned light, wind, water and / or nuclear power. According to the method, the reactant is taken as a diluent of the raw material gas, so that the situation that the product gas is needed to be introduced into the raw material gas for diluting the reactant concentration by a recycle compressor in the traditional methanation technology can be avoided; therefore, the compressor is omitted, and the power consumption of mechanical equipment is reduced.