7results about How to "Improve grindability" patented technology

The utility model discloses a device for preparing a slurry organic desulfurization and denitrification agent through co-baking of biomass coupled with CaO. The device comprises a biomass bin, a CaO bin, a screw feeder, a double-paddle baking-crushing machine, an external combustor, a condenser, a wet ball mill, a urea aqueous solution tank, a dispersing agent tank and the like. Biomass and CaO are respectively fed into the double-blade baking-crushing machine through the screw feeder to be subjected to baking reaction; keeping the temperature of the baked material at the baking temperature, feeding the baked material into a condenser for quenching, mixing the quenched and baked biomass with the condensed baking liquid to form slurry, feeding the mixed slurry into a wet ball mill, and stirring and grinding the mixed slurry together with a urea aqueous solution and a dispersing agent to prepare biomass-based organic desulfurization and denitrification agent slurry. The desulfurization and denitrification agent provided by the utility model has double denitrification effects, namely a reburning denitrification effect of baked biomass powder and a deep reduction denitrification effect of urea under the catalytic activation effect of baking liquid, and is suitable for desulfurization and denitrification transformation of distributed small-sized industrial kilns.

This invention relates to a method for modifying molten steel slag with carbon dioxide throughout the entire process under normal pressure. The method includes: first, adding the first batch of steel slag to a slag pot for melting; then, adding 10%–35% of the mass of the first batch of hot molten steel slag as a steel slag fracturing agent to the slag pot; next, unloading a second batch of hot molten steel slag into the slag pot through a slag discharge device of a converter or continuous casting system; then, adding a second batch of hot molten steel slag as a steel slag fracturing agent to the slag pot, repeating this cycle until the slag pot is full. This method achieves complete dissociation and efficient separation of the molten steel slag by adding modified steel slag tailings and steel slag fracturing agent in layers into the slag pot, utilizing the phased and temperature-segmented release of carbon dioxide by the fracturing agent. This completely solves the problems of iron-rich casting residue, desulfurization slag welding pot, and agglomeration. This method can be combined with the phased supply of solid carbon dioxide to synergistically improve the strength of the steel slag. The residue after supply can be utilized as a resource, making it environmentally friendly and efficient.

The utility model discloses a steel slag pretreatment system which comprises a steel slag crusher, an iron remover is arranged at a feed opening of the steel slag crusher, a feeding scale is arranged at a feed opening of the iron remover, the feeding scale is communicated with a steel slag vertical mill to form a communication channel, a first dust collector is arranged in the communication channel, and the steel slag pretreatment system further comprises a tail exhaust fan, an outlet of the tail exhaust fan is communicated with a kiln tail waste gas pipeline, and a first valve is arranged on the kiln tail waste gas pipeline. The utility model relates to the technical field of cement production, and the steel slag pretreatment system can reduce the content of free calcium in steel slag through activation treatment of heating, pressurizing and carbon adding of kiln tail waste gas, so that the stability and grindability of the steel slag are improved to a certain extent, and the addition amount of converter steel slag in steel slag and slag Portland cement is favorably increased.

The utility model provides a coal coke membrane which adopts coal coke and biomass charcoal as main raw materials, is prepared through pyrolysis and forming processes, and has a porous structure and efficient liquid filtering performance. And the mass ratio of the coal coke to the biomass charcoal can be regulated and controlled so as to optimize the pore size distribution and the filtering efficiency. The membrane is doped with a non-metallic mineral material so as to enhance the adsorption capacity and the separation efficiency. The membrane exhibits an impurity removal rate of at least 90% when treating cotton spinning waste liquid. The preparation process comprises the steps of raw material mixing, binder adding, pyrolysis treatment, cooling smashing and forming. The coal coke membrane has high stability, selectivity, permeability and mechanical strength, provides an efficient and stable novel membrane material for industrial wastewater treatment, and has a remarkable application prospect.

The invention provides biomass coal water slurry and a preparation method thereof. The preparation method comprises the following steps: mixing biomass with quick lime and water, and hydrolyzing to obtain biomass semicoke; then carrying out pyrolysis on the biomass semi-coke to obtain biomass coke; and finally, mixing the biomass coke with pulverized coal, wastewater and a dispersing agent to obtain the biomass coal water slurry. The biomass is sequentially subjected to two-step hydrolysis and pyrolysis, so that the energy density of the biomass can be effectively improved, and the application feasibility of the biomass in the coal water slurry gasification furnace is greatly improved; the coal water slurry dispersing agent has the advantages that the coal water slurry dispersing agent is added, the grindability and slurry forming property of biomass are improved, the apparent viscosity of the coal water slurry can be reduced, the slurry forming concentration of the coal water slurry is increased, the use amount of the coal water slurry dispersing agent is reduced, the cold gas efficiency of a coal water slurry gasification furnace can be improved during subsequent coal water slurry gasification, and the economic cost is obviously reduced.

The invention belongs to the technical field of biomass energy and resource utilization pretreatment, and particularly relates to a biomass high-temperature anti-explosion grinding system and a grinding technology.The biomass high-temperature anti-explosion grinding system comprises a grinding machine, a feeding port is formed in the grinding machine, a discharging port is formed in the top of the grinding machine, and the discharging port conveys materials to a cyclone separator through a powder discharging fan to be separated and collected; a cyclone separator is arranged at the top of the pulverizer, an adjusting gas path is further arranged at the bottom of the pulverizer, the gas inlet end of the adjusting gas path is communicated with the top of the cyclone separator, and an air blower is further arranged on the adjusting gas path. Smoke with the oxygen content lower than 1% serves as an airflow carrier, biomass is pulverized at the temperature of 150-200 DEG C, the pulverizing efficiency is improved, and the grindability of the biomass is improved.

A method for synergistically preparing green Portland cement clinker by utilizing multi-element solid waste comprises the following steps: (1) obtaining raw materials of limestone, silica, phosphorite beneficiation powder, copper tailings, ferroalloy slag and coal-fired slag, burdening according to silicate, and mixing and grinding to obtain a raw material; (2) preheating the obtained raw material by a preheater, and then feeding the raw material into a decomposing furnace for decomposing; (3) calcining in a rotary kiln after decomposition to obtain green Portland cement clinker; the method has the beneficial effects that 1, the copper tailings are doped, so that the burnability of the raw material is improved, and the cost of the raw material is reduced; 2, the content of f-CaO in the clinker can be reduced, the compressive strength, compactness, water resistance and stability of the clinker can be improved, the quality of the clinker is improved, and the coal consumption of clinker sintering is reduced; thirdly, after the copper tailings are used for replacing a part of ferroalloy slag, the content of water-soluble hexavalent chromium in the cement is reduced; and 4, by doping the coal-fired slag, the grindability of the raw material can be improved, the quality of the clinker is improved, the coal consumption of clinker sintering is reduced, and the cost is reduced.