2215 results about "Pulverized fuel ash" patented technology

Methods involve adding sorbent components, such as calcium oxide, alumina, and silica, as well as optional halogens as part of environmental control. Use of the sorbents leads to significant reductions in sulfur and mercury emissions that otherwise would result from burning coal. Use of the sorbents leads to production of waste coal ash that, while higher in mercury, is nevertheless usable as a commercial product because the mercury in the ash is non-leaching and because the coal ash has a higher cementitious nature by virtue of the increased content of the sorbent components in the ash. Thus, the methods involve adding powders having qualities that lead to the production of a cementitious coal ash while at the same time reducing emissions from a coal burning facility.

A method of treating a coal combustion flue gas, which includes injecting a molecular halogen or thermolabile molecular halogen precursor able to decompose to form molecular halogen at flue gas temperature. The molecular halogen coverts elemental mercury to mercuric halide adsorbable by alkaline solids such as subbituminous or lignite coal ash, alkali fused bituminous coal ash capturable in whole or part by electrostatic precipitators (ESPs), baghouses (BHs), fabric filters (FFs), dry flue gas desulphurization solids, with or without subsequent adsorption by a liquid such as a flue gas desulphurization scrubbing liquor.

The invention discloses a coal slime flotation collector and a preparation method thereof. The coal slime flotation collector comprises the following matters in percentage by weight: 20-50 percent of kerosene and/or light diesel oil, 1-5 percent of primary emulsion, 0.006-0.015 percent of auxiliary emulsion and the balance of water; wherein the primary emulsion is a mixture of polyoxyethylene sorbitan fatty acid ester and dehydrated sorbitol fatty acid ester, and the hydrophile-lipophile balance (HLB) value of the primary emulsion is within 12.8-14.3; the auxiliary emulsion is selected from the following (1) or (2), wherein the (1) is sodium dodecyl benzene sulfonate, and the (2) is a mixture obtained by mixing fatty alcohol polyoxyethylene ether sulfate and the sodium dodecyl benzene sulfonate according to the mass ratio of 1: 0.5-2. The coal slime flotation collector has good stability, simple preparation process and 40-60 percent of the oil-saving ratio on the premise of improving the float yield and the tail coal ash proportion. The collector is beneficial to saving the energy, reducing the emission and improving the economical benefit when being used for floating the coal slime.

The invention discloses insulating dry powder mortar which is made from portland cement, pulverized fuel ash and/or slag powder, organic polymer emulsion powder, flame-retardant polystyrene foam particles, thermal insulating aggregate, composite fiber, water resisting agent and admixture. The insulating dry powder mortar has the advantages of light volume weight, low thermal conductivity, comprehensive utilization of waste material, environmental protection, resource saving, cracking resistance, ageing resistance, strong cohesive force, favorable workability and construction performance, convenient use, waterproofness, permeation resistance, high compression strength, convenient storage and transportation, no environmental pollution, and the like and can be widely used for preserving heat in the internal wall and the external wall of a building and other special engineering.

The invention provides a method for producing baking-free bricks by using phosphorous gypsum based cementitious material to solidify yellow phosphorous slags. 1) The raw materials and formula of the invention are as follows: (1) the phosphorous gypsum cementitious material: 40-60 parts of phosphorous gypsum, 0-30 parts of yellow phosphorous slags, 0-30 parts of pulverized fuel ash, 0-5 parts of blast furnace slag, 10-15 parts of calcined lime, and 0-10 parts of carbide slag; (2) the mateirals of the baking-free brick green bodies: 100 parts of phosphorous gypsum cementitious material, 150-300parts of yellow phosphorous slags raw materials, 2-4 parts of activator, 0.2-1 part of auxiliary agent, and 10-40 parts of water. 2) The preparation method: the baking-free bricks are produced throughthe steps of treating raw materials, mixing the solution with additive, preparing brick blanks and moulding and conserving. In the production process of the invention, no organic matter is added, thus completely avoiding the pollution problems of toxic substance caused by degradation of organic materials, and the release of additive and volatilization of residues, and having the advantages of lowcost, good physical property, high production efficiency, saving of energy consumption and non environmental pollution.

The invention discloses a thermal insulation building mortar. The thermal insulation building mortar is prepared by the mixing portland cement, pulverized fuel ash, calcium bentonite, re-scattering glue powder, hypromellose, polyacrylamide powder, polypropylene fibre, wood fiber, permeating crystal waterproof agent, air entraining agent, vitrified micro-bead, sizing phase-change material and hollow glass bead. A preparation process thereof comprises the steps of: a) preparing the sizing phase-change material, b) preparing the permeating crystal waterproof agent and c) preparing the thermal insulation building mortar. The mortar of the invention is characterized by the functions of thermal insulation, phase-change energy storage, temperature control, water resistance and energy saving, the wide application scope and low cost. The mortar is widely applied in thermal insulation work inside or outside the buildings and has a broad prospect.

A sludge solidification method is a method for carrying out solidification treatment to the sludge produced in water conservancy projects and civil engineering. The method is that: a. the liquid water content, the clay content and organic content of dredging sludge are tested. b. curing agent is prepared: the curing agent mainly contains cement and calcium oxide which play the function of solidification; wherein, the weight proportion is between 1 : 1 to 4 : 1; waste gypsum is used as water reducing agent which occupies 1 to 8 percent of the sum of cement and calcium oxide in proportion; mealy sand or pulverized fuel ash are used as concrete aggregate which occupies 3 to 5 percent of the sum of the cement and calcium oxide in proportion; c. the curing agent-mixing ratio which is usually controlled from 5 to 20 percent is determined; sampling respectively is carried out, setting time is tested and the unconfined compressive strength which maintains 7, 14 and 28 days is tested by sampling, and the curing agent-mixing ratio finally is determined according to optimal performance price ratio; d. the sludge is carried out curing and constructing in site; mechanical devices are used for stirring the curing agent and the sludge rapidly and evenly, thereby leading the solidification to be rapid and full.

In one example of an embodiment of the invention, a method for producing an aggregate is disclosed comprising mixing sewage sludge from a waste water treatment facility with a non-coal combustion ash silicoaluminous waste material, agglomerating the mixture to form an agglomerate, and pyroprocessing the agglomerate to form an aggregate. The waste material may comprise municipal solid waste incinerator bottom ash, incinerator fly ash, incinerator filter dusts, cement kiln dusts, waste glass, blast furnace slag, kiln dusts, and/or granite sawing residues, for example. The method may further comprise milling the waste material prior to mixing. Preferably, the milling is wet milling. Pyroprocessing of the agglomerate may take place in a rotary kiln. The resulting aggregate may be a lightweight or a normal weight, sintered or vitrified aggregate. Aggregates and methods for making aggregates of high and low calcium silicoaluminous materials are also disclosed.

The invention discloses an inorganic heat insulation load-bearing concrete, belonging to the technical field of heat preservation load-bearing concrete. The invention aims at solving the problem of providing a concrete which not only can meet the requirements of stress performance of structural components of buildings, but also has good heat preservation property. The adopted scheme comprises: the concrete comprises the components with mix proportion by weight (kg/m<3>): the ratio among composite lightweight doped-aggregate, cement, sand, carpolite, ceramsite, pulverized fuel ash, water and admixture is (6-225): (200-800): (300-700): (500-1600): (150-650): (10-600): (80-400): (0.1-200); wherein the composite lightweight doped-aggregate is one or mixture of more in vitrified micro-bead, vermiculite, expanded perlite and modified expanded perlite, and has the density of (50-180)kg/m<3>. Therefore, the load-bearing concrete can be widely applied to the field of building technology.

The invention discloses an environment-friendly efficient filter filtering paper. The environment-friendly efficient filter filtering paper is prepared by the following raw materials in part by weight: 40-50 parts of softwood pulp, 30-40 parts of waste paper pulp, 20-30 parts of high-silica glass fiber, 2-5 parts of modified vermiculite, 1-3 parts of zeolite molecular sieve, 2-4 parts of nanometer calcium, 1-2 parts of modified pulverized fuel ash, 2-3 parts of water-solubility organic silicon resin emulsion, 1-2 parts of water-solubility polytetrafluoroethylene emulsion, 0.5-0.8 parts of ammonium polyphosphate, 3-4 parts of glycerol triacetate, 0.5-1 parts of diethanolamide, 0.5-1 parts of silane coupling agent KH560, 0.4-0.8 parts of sodium dodecyl sulfate, 0.5-1 parts of antioxidant DSTP, and 4-6 parts of polyethylenimine. The filtering paper prepared by the method provided by the invention has the advantages of being good in water permeability, large in filtering area, small in maximum diameter of hole, high in filtering precision, strong in bursting strength, high-temperature-resistant, good in water resistance and the like, can achieve the filtering efficiency by 99.98%, has stable performance index at atmospheric and high-temperature working conditions, as well as better temperature resistance and filtering effects.

The invention discloses a method for preparing a foamed ceramic insulation board by a waste glass ceramic wafer, belonging to the field of preparation technology of the foamed ceramic insulation board. The method comprises the steps of: washing the waste glass ceramic wafer with clear water, drying and grinding by ball milling to obtain waste glass ceramic powder with the fineness less than or equal to 100mu m; mixing the waste glass ceramic powder, pulverized fuel ash, furnace slag, coal gangue, ceramic tailings, foaming agent and modifying agent according to the mass ratio of (30-40):(10-15):(5-7):(10-18):(25-35):(1.8-2.2):(1.1-1.5); putting the mixture into a ball grinding mill, carrying out wet grinding and evenly mixing to form mixed slurry; drying by a pressure type spray granulation dryer and putting the dried product into a foaming refractory mould coated with aluminum oxide; heating to 1120-1150 DEG C in a heating furnace; and finally, annealing, cooling and cutting to obtain the foamed ceramic insulation board. The method is low in production cost and simple in technology, and can be used for continuously preparing the porous foamed ceramic insulation board with large size; and the product is good in performances.

The invention discloses self-compacting concrete prepared from concrete mixing station waste slurry.The self-compacting concrete is prepared by mixing, by weight, 270-330 parts of cement, 135-165 parts of pulverized fuel ash, 90-110 parts of the concrete mixing station waste slurry, 770-840 parts of river sand, 875-940 parts of gravels, 4.5-5.5 parts of a water reducing agent and 100-150 parts of water, wherein the concrete mixing station waste slurry is formed by precipitating concrete mixing station wastewater, the water content of the concrete mixing station waste slurry is 45%-50%, and the concrete mixing station waste slurry is generated in 24 hours.Accordingly, the self-compacting concrete is prepared from the waste slurry obtained by precipitating the concrete mixing station wastewater, therefore, the dosage of the cementing material and the water is decreased, the cost of the self-compacting concrete is greatly reduced, harmless high-additional value utilization of the concrete mixing station waste slurry is achieved, the very good environmental protection effect is achieved, and a green sustainable development road is achieved.

The invention relates to heavy metal sludge treated agent and a treating method thereof and in particular discloses a heavy metal pollution bottle sediment curing agent. The curing agent comprises cement and pulverized fuel ash, the mass ratio of the pulverized fuel ash to cement is 1:(0.5-11).The curing method of the curing agent comprises the following steps: directly adding the curing agent tothe heavy metal pollution bottle sediment with the use level of the curing agent being 0.4-1.5 times of the use level of the heavy metal pollution bottle sediment; maintaining the mixture after beingadded the curing agent for at least 3 days; and finally, completing the curing process.The curing agent and curing method of the invention not only has low processing cost but also ideal curing effect.

The invention relates to a rubber-cement grouting material applied to a semi-flexible pavement, belonging to waste recycling field in the environmental protection field and the application field of highway engineering. The rubber-cement grouting material applied to the semi-flexible pavement is characterized by being formed by mixing the components based on parts by weight: 100 parts of cement, 10-50 parts of pulverized fuel ash, 5-30 parts of expanding agent, 1-30 parts of rubber powder, 10-50 parts of sand, 0.1-5 parts of water reducing agent, 0.1-5 parts of early strength agent and 40-70 parts of water. The rubber-cement grouting material has high fluidity and anti-cracking property, lower contraction and higher early strength, and can meet the groutability and pavement performance of the semi-flexible pavement material.

The invention relates to a roadbed filler for a road and a preparation method of the roadbed filler. The roadbed filler for the road is characterized by being prepared from lime, pulverized fuel ash, phosphogypsum and stabilizer. The weight percentage of each material in the lime, the pulverized fuel ash and the phosphogypsum is 15% of lime, 30-50% of pulverized fuel ash and 35-60% of phosphogypsum; the sum of the weight percentages of the materials is 100%; the stabilizer is water glass or NaAlO2 (sodium metaaluminate); the adding amount of the water glass is 2-6% of total mass of the lime, the pulverized fuel ash and the phosphogypsum, and the adding amount of the NaAlO2 is 0.5-2% of total mass of the lime, the pulverized fuel ash and the phosphogypsum. Due to the roadbed filler for the road prepared by the method, not only can the early strength be improved, but also the problem of water stability can be solved.

Methods for removing carbonyl sulfide (COS) from a synthesis gas stream are disclosed. The method entails raising the water level of a wet scrubber so that hydrolysis of the COS may occur in the scrubber itself instead of a COS reduction chamber and no additional catalysts other than those naturally occurring in the production of the synthesis gas need be introduced into the scrubber. The water is raised, in one example, to a level such that water within an inner tube of the wet scrubber flows over an upper end of the inner tube. Raising the water level in the scrubber ensures intimate and vigorous interaction between the water, the COS, and the naturally occurring catalyst, and promotes the hydrolysis of the COS. In one example, the naturally occurring catalyst (e.g., alumina oxide) is present in the coal ash produced when coal is the fuel gasified that creates the synthesis gas stream.

The invention discloses industrial waste slag-doped composite silicate cement and a production method thereof. The industrial waste slag-doped composite silicate cement comprises the following material components: 45-58 percent of silicate cement clinker, 3-5 percent of desulfurization gypsum, 1.5-4 percent of lime stone, 0.2-0.3 percent of cement grinding additive, 10-29 percent of granulated blast furnace slag, 2-10 percent of coal slag, 4-10 percent of pulverized fuel ash, 2-10 percent of ferroalloy slag, 2-10 percent of zinc metallurgical slag and 0.2-0.25 percent of waste slag grinding aid active excitant. The production method comprises the following steps of: taking and mixing the first four materials according to the proportion and grinding into 300-350m<2>/kg of powder; taking and mixing the rest six materials according to the proportion and grinding into 420-450m<2>/kg of superfine powder; and then combining the two kinds of powder, stirring and homogenizing. By adopting respective grinding of clinker and waste slag, the waste slag fineness reaches an optical value for stimulating the activity, the hydration progress and the cement clinker reach synchronization, and the doping amount and doping category of waste slag are also improved.

The invention relates to a method for preparing a quick-hardened cement-based adhesive by utilizing refuse-incinerated fly ash, comprising the following steps of: (1) calcination of sulphoaluminate cement: raising the temperature of a sulphoaluminate cement raw material to 1,200-1,250 DEG C in the temperature rise speed of 20-30 DEG C/min, then preserving the temperature for 1-2h to form a sulphoaluminate cement clinker, and mixing the sulphoaluminate cement clinker with anhydrous gypsum to obtain the sulphoaluminate cement; and (2) preparation of the quick-hardened cement-based adhesive: blending the sulphoaluminate cement, quartz sand, pulverized fuel ash, hydroxypropyl methyl cellulose, re-dispersible rubber powder and fibers to obtain the quick-hardened cement-based adhesive. Comparedwith the prior art, the method can ensure the performance of the product and also can reduce serious environmental burden and processing cost which are caused by not utilizing the fly ash, desulfurized gypsum and the like.

The invention belongs to the technical field of building materials and particularly relates to inorganic heat-preservation sand pulp with desulfurated gypsum as main gelled materials. The inorganic heat-preservation sand pulp is composed of the desulfurated gypsum, slag powder, pulverized fuel ash, Beta-semi-hydrated gypsum, lime, latex powder, vinol fibers, cellulose ether and an air entraining type high-efficiency water reducing agent. The invention not only can solve the high-efficiency recycling problem of the desulfurated gypsum (an industrial solid waste), but also can effectively avoid the problems that the hydration of the desulfurated gypsum is slow and the water resisting property of the traditional gypsum-based inorganic heat-preservation sand pulp is poor. Therefore, the invention is suitable for wall body heat-preservation engineering construction of various buildings and can meet certain requirement for the intensity.

The invention provides a composite alkali-resistant refractory brick of pulverized fuel ash, wherein the composite brick is applied to the inner lining of an industrial kiln and is prepared by providing refractory aggregate, refractory powder, light aggregate, refractory clay, aluminate cement and silica micropowder to the pulverized fuel ash of solid wastes of a fuel electric plant and the coal cinder after burning, then adding water into the same and mixing, and then pressing and drying. The composite alkali-resistant refractory brick of pulverized fuel ash is composed of compact refractory material components and heat insulation material components. The percentages by weight of the compact refractory material components are as follows: the refractory aggregate is 55 to 65 %, the pulverized fuel ash is 5 to 8 %, the refractory powder is 10 to 15 %, the silica micropowder is 4 to 6 % and the aluminate cement is 8 to11 %; the percentages by weight of the heat insulation material components are as follows: the coal cinder is 50 to 65 %, the pulverized fuel ash is 5 to 10 %, the light aggregate is 5 to 10 %, the refractory clay is 5 to 8 %, the refractory powder is 10 to 16 %, the silica micropowder is 3 to 5 % and the aluminate cement is 7 to 10 %; and the compact refractory material components and the heat insulation material components of the composite alkali-resistant refractory brick of pulverized fuel ash provided by the invention are pressed into a tightly combined compound. Compared with common refractory brick, the composite alkali-resistant refractory brick of pulverized fuel ash provided by the invention has the advantages that a heat insulation layer is increased, the temperature for the skin of the rotary kiln can be reduced, a great quantity of energy can be saved and the service life of the kiln is prolonged.

The invention relates to a braking-free brick mainly prepared from polyaluminum chloride waste residues and red mud and a preparation method thereof. Raw materials for preparing the braking-free brick comprise the red mud, the polyaluminum chloride waste residues, an active mineral material, lime and gypsum. The preparation method comprises the following steps: uniformly mixing the raw materials in proportion, adding 8-12 parts of water, stirring, mixing, carrying out compression molding, sprinkling water and curing. The preparation method has the advantages that the red mud and the PAC (polyaluminum chloride) waste residue are used as the main raw materials, pulverized fuel ash, cement, the lime and the gypsum are added, so that the using amount of an excitant is reduced, the strength of the brick is improved, the usability of the braking-free brick can be improved, meanwhile the national standard requirements are completely satisfied, a gel material does not need to be added in a production process, the heat energy does not need to be consumed, the accumulation of the red mud and the PAC is reduced in a larger sense, and the pollution to environments due to the emission of the red mud and the PAC waste residues is solved.