42results about How to "Reduce firing heat consumption" patented technology

The invention discloses a shaft kiln new craft to produce cement through supplying carbide slag dosage, which comprises the following steps: using carbide slag to replace lime rock in the cement slurry and dosage completely or partly; making carbide slag after filter-pressing as raw material; mixing evenly with grinding slurry and dosage directly; producing raw material rod or raw material ball; entering into shaft kiln; calcining to clinker. This invention is an energy-saving and environmental new technology, which can save coal, water and lime rock source.

The invention discloses a method for producing cement clinkers from dried carbide slag completely instead of natural limy materials, which relates to the field of building materials. Firstly, three auxiliary materials (including sand rock, coal ash and sulfur acid residue) are compounded, pulverized and sieved, and the fine powder is fed into a dryer. Then, the carbide slag with a water content less than or equal to 12% is fed into the dryer, and undergoes intensive heat exchange with the hot flue gas at the charge side, realizing complete drying and mixture. The crude material powder is fed into first-stage, second-stage and third-stage cyclone cylinders to undergo multiple suspension heat exchange with the hot flue gas, and then enter a rotary kiln for calcination. The hot flue gas inside the klin undergoes the heat exchange in a pipeline calciner and a wind pipe and then reversely flows into the third-stage, second-stage and first-stage third-stage cyclone cylinders, the dryer, a cyclone dust collector, a system fan and an airbox pulse bag-shaped dust collector sequentially, and the purified gas is discharged into the external atmosphere. The coal powder jets into the calciner at the charge side for further combustion, and the crude material powder undergoes decomposition reactions: Ca(OH)2-H2O+CaO. The clinker burned in the rotary kiln is cooled by a grate cooler and then delivered to a clinker storage room. In the invention, the waste carbide slag is completely dried by using the exhaust gas at the discharge side, and the heat consumption for clinker combustion is reduced by about 25%, thereby realizing energy conservation and exhaust reduction.

The invention discloses a method for producing alpha-Al2O3 by employing a predecomposition technology and taking aluminium hydrogen as a raw material. The method adopts a feeding system, a Venturi dyer, a first cyclone preheater, a second cyclone preheater, a third cyclone preheater, a roasting furnace, a natural gas burner, a kiln natural gas burner, a rotary kiln, a cooler and a dust removal system. Special aluminum oxide alpha-Al2O3 is produced by adopting a predecomposition technology. Large-scale production, low energy consumption (950*4.18kj / kg) and stable quality can be achieved, and achievement of automatic production control is achieved. The method is fewer in used equipments, small in floor area, simple in operation, high in quality of produced alpha-Al2O3, high in production efficiency, and simple and convenient in operation process, reduction of the production cost is facilitated, the operation flow is greatly simplified, the production time is shortened, and improvement of economic benefits of enterprises is facilitated.

The invention relates to an unlimited compatible method for producing cement clinker by using carbide slag and limestone as raw materials, belonging to the technical field of resources and environment. The method uses the carbide slag as the calcareous raw materials, and the cement clinker is calcined by using a novel dry technology, which is characterized in that: either 100 percent of carbide slag or 100 percent of limestone can be used as the calcareous raw materials, or the carbide slag and the limestone can be mixed at any ratio for use. A main process comprises the following steps of: (1) kiln rear feeding, in which a preheater can be switched between the stage 3 and the stage 5 through changing a position of a material feeding point; (2) raw material pre-decomposition, in which a five-stage preheater which is switchable to a three-stage preheater and an enhanced suspension spray type decomposition furnace are used in order to combust the fuels and decompose the raw materials, wherein the outlet temperature of the decomposition furnace is controlled between 700 and 890 DEG C; and (3) rotary kiln calcining, in which the decomposed raw materials enter the kiln to be calcined into the cement clinker. The method has the characteristics of high resource regeneration level of the carbide slag, obvious energy-saving and emission-reduction effect, strong system compatibility andthe like.

The invention discloses a multiphase dynamic catalytic oxidation combustion method for dry-process rotary kiln pulverized coal. Nanoscale molecular multiplex catalyst precursor is continuously added into kiln head pulverized coal in a liquid state mode; multiphase dynamic high-temperature flame catalytic oxidation combustion is carried out in the kiln; parts of nanoscale functional metallic oxide catalyst formed by the high-temperature flame section enter the coal, material and wind suspension system in the decomposing furnace by pulling wind; and catalytic oxidation combustion is carried out again. The waste functional metal ion oxide serves as high-efficiency ion-type sintering aid in the kiln to accelerate C3S in the cement clinker to be generated and reduce fCaO. According to the invention, two bundles of fire of a dry-process kiln are burned, clinker sintering thermal loss is effectively lowered, clinker quality and kiln yield are improved, the discharge value of CO2 and CO are reduced, thus saving energy and reducing emission, as well as lowering cost.

The invention discloses a denitrification combustion method used for production of a cement kiln. The denitrification combustion method comprises a smoke chamber, a decomposition furnace and a tertiary air duct, wherein one end of the smoke chamber is connected with the decomposition furnace through a pipeline, the other end of the smoke chamber is connected with the cement kiln, the tertiary airduct is connected with the decomposition furnace, and a coal feeding device and a four-stage blanking pipe are arranged at the top of the smoke chamber. Compared with the prior art, the denitrification combustion method used for production of the cement kiln has the advantages of being high in reliability, high in resource utilization rate and low in running cost.

The invention discloses a method and a device for preparing a nickel iron roasted ore by utilizing a lateritic nickel ore. The method comprises the following steps: firstly, grinding the lateritic nickel ore into an ore powder, then carrying out high-temperature roasting of the obtained ore powder, during the high-temperature roasting process, allowing the ore powder to be in a pre-reduction system and carry out a high-temperature preheating reduction reaction, followed by allowing the high-temperature roasted ore to go into a rotary kiln for high-temperature calcination, thus obtaining a roasted ore containing nickel pig iron after completing high-temperature calcination, and then after dipping the roasted ore into water for cooling, separating to obtain the nickel iron roasted ore. The device comprises a hopper-type elevator, an air chute, a chute draught fan, a rotary feeder, a sluice valve, a rotary kiln, a water-cooling stirring tank, a burner, a hot wind mixing chamber, a high-temperature draught fan, a cyclone dust remover, a bag-type dust remover, a chain-type conveyor, a burner and a pre-reduction system. The preparation method and the device allow the heat transfer area of the ore powder to be large, enable each particle to be uniformly and fully subjected to a chemical reaction, have short reaction time, and have high utilization rate of the lateritic nickel ore.

The invention provides a magnesium slag granulation method, which comprises the following steps of 1, mixing waste and abandoned glass and borax according to a mass ratio of (20 to 50):1; then, performing crushing and ball milling on the mixed material to obtain a magnesium slag optimizing agent; 2, using calcined dolomite, a silicon iron reducing agent, a mineralizer as metallic magnesium production raw materials; adding a certain amount of magnesium slag optimizing agent into the metallic magnesium production raw materials; performing uniform mixing to form a mixed material; 3, putting the mixed material into a reduction tank; smelting magnesium according to a Pidgeon process; in the magnesium smelting process, separating out metallic magnesium in a steam form; the waste slag is coated with a liquid phase formed by the magnesium slag optimizing agent; a hard shell body is formed after natural cooling; granulous magnesium slag is finally obtained. The method provided by the inventionhas the advantages that the process is simple; the cost is low; the granulation and agglomeration of the magnesium slag are completed in one step in the metallic magnesium smelting process; meanwhile,the consumption of the mineralizer can be reduced.

The invention relates to a multi-product cleaning and producing method comprehensive utilization; coal carbon production, power generation by burning coal gangue, cement production, power generation by cement afterheat and wall material production technology are combined in a same industrial symbiont by using industrial symbiosis; optimal configuration between working procedures is realized; processing procedures of raw materials are converted into processing working procedures capable of separating raw materialsand fuels into different material flows and power flows which have different transport directions; mutually beneficial relationship is established between working procedures; a predetermined downstream working procedure is directly capable of digesting ''pollutant'' of an upstream working procedure; each working procedure utilizes different raw material component and different gradient energy source so as to produce multiple products; so that energy and matter flow in a multi-channel manner; and a little-pollution multi-prduct cleaning and producing technology is formed.

The invention belongs to coal additive field, especially a dry method concrete technology burning high efficiency additive. The feature is that it is made up of 20-30 portions of steel ground slag, 10-30 portions of barium slag, 5-10 portions of potassium permanganate, 1-2 portions of modification paper making sewage, 5-10 portions of citric acid, and 30-50 portions of high calcium fly ash. It could enhance the fire feature, and decline the firing temperature and no negative effect to concrete clinker aggregate.

The invention relates to a preparation method of the phosphorus residue portland clinker. The clinker is includes limestone, pyrite residue, river sand, phosphorus reside and gangue raw material. It is formed by the following steps that the raw material is mixed in proportion, used pulverizing together and fired by the pre-decomposition kiln system at the condition of new type dry method cement system. The weight mixing proportion of the raw material orderly is from seventy to eighty five, from five to seven, from one point five to three, from eight to fifteen, and from zero point five to five. The invention can use the industry waste that phosphorus reside, pyrite residue and gangue as the raw material to prepare the low temperature loading type portland clinker. So it can solve the shortage of the fat limestone, clay, and iron ore, as well as supply a perfect approach for industry waste processing. Moreover, it can save the resource and energy source, reduce the pollution discharging, and is good for reducing cost, protecting environment, and increasing output and quality of the clinker, so that it is easy to popularly use in the new type dry method cement plant.

The invention discloses a method for preparing a concrete expanded clinker by utilizing low-grade limestone. Low-grade limestone tailing is used as a main calcium raw material; acetylene sludge is used as an adjusting material for the calcium raw material; desulfurization gypsum is used as a sulfur raw material; high alumina gangue is used as an aluminum raw material; and the concrete expanded clinker is prepared from the following raw materials in parts by weight: 50-55 parts of low-grade limestone, 25-30 parts of acetylene sludge, 5-15 parts of desulfurization gypsum and 10-15 parts of high alumina gangue. The invention develops a new method for preparing the concrete expanded clinker in the manner of treating waste with waste, can efficiently solve the social problem of the pollution to ecological environment by industrial waste, can realize the resource reutilization, can reduce the production cost of the concrete expanded clinker, can promote the market competitiveness of the concrete expanded clinker and has obvious social and economic benefits.