3472 results about "Red mud" patented technology

The invention relates to a high-strength compress supporting agent for coarse oil and a preparation method thereof. The high-strength compress supporting agent for the coarse oil is prepared from the following raw materials by mass portion: 60 to 85 portions of ceramic roller waste, 1 to 20 portions of red mud, 0 to 20 portions of fly ash, 0 to 5 portions of manganese oxide or barium carbonate, 0 to 3 portions of dolomite and 5 to 10 portions of ceramic clay. The ceramic roller waste refers to corner waste or/and damaged and broken ceramic roller waste in the processing process of ceramic roller manufactures, and Al2O3 content of chemical compositions of the ceramic roller waste is not less than 68 percent. The high-strength compress supporting agent for the coarse oil prepared from the ceramic roller waste with high alumina content has the characteristics of high strength and acid resistance, and is used for oil fracturing in medium-deep wells; and the preparation method is simple and feasible, and is suitable for batch production.

A sintered insulating hollow building block is prepared from coal gangue, powdered coal ash, steel slags, metallurgical tailings, red mud, and rejected solid (building garbage, life garbage and city mud) or shale through proportionally adding adhesive and millipore forming agent and sintering.

The invention relate to a method of extracting scandium from red mud, the method utilize the red mud that come from the process of producing aluminum oxide from alumyte, in accordance with specific characteristics of red mud, applying hydrochloric acid leach, P204 abstraction, acid-washing edulcoration, sodium-hydroxide back extraction, ammonia modifier hydrolytic decomposition zirconium and titanate in hydrochloric acid solution, oxalic acid precipitating scandium and medium temperature calcining technique, the purity of final production Sc2O3 is 99.9%. Extracting scandium from red mud change refuse into available material, save mineral resources, benefiting environmental conservation. The invention also fills up the study vacant of isolation technique in high-strength zirconium titanate and scandium.

The invention relates to a short-process environmentally-friendly comprehensive red mud utilization method and equipment for comprehensively utilizing energy, which can be used for refining iron in high-pollution red mud difficult to treat, with high efficiency, high quality and high benefits, and applying the iron to electric furnace steel making or steel casting and the like, without using coke, so as to realize the large-scale comprehensive utilization of the red mud. High-temperature smoke of a revolving bed is used for waste heat generation, secondary-combustion hot wind preheating, pellets preheating and red mud drying, a dry quenching pellet technology is used for applying the heat of high-temperature pellets to waste heat generation so that waste heat is fully utilized, a low-cost pressure swing adsorption oxygen generation technology is utilized, and therefore, the comprehensive energy consumption and the production cost are low. Aluminum silica residues are used for producing high-grade cement or used as the raw material for refractory materials; and Na2O and K2O and other alkaline metallic oxide powder are used for refining metal Na and K, or used for producing the raw materials of fertilizers, or used as chemical raw materials. Accordingly, the problems on environmental pollution, land occupation for stacking and safety due to the red mud are thoroughly solved, and the economic and social benefits are obvious.

A porous particulate material for treating a fluid containing a contaminant is disclosed. The particulate material comprises a cementitious matrix or binder and treated bauxite refinery residue or red mud. At least a portion of the pores in the particulate material is open cell or interconnected pores. The invention also relates to the use of a reactive permeable barrier comprising porous material, for treating a contaminated fluid. Also disclosed is a method for producing porous particulate material for treating a contaminated fluid and a method for treating a contaminated fluid, in which the porous material is used. The invention furthermore relates to a cementitious composition comprising partially neutralised red mud and cement, wherein the partially neutralised red mud has been pre-treated by contacting it with water having a total hardness supplied by calcium, magnesium or a combination thereof, of at least 3.5 millimoles per litre calcium carbonate equivalent. The cementitious composition is useful as a building and construction material.

The invention discloses a red mud preparing sulpho-aluminate cement, which is characterized by the following: using 26%-41% red mud to take place of part of aluminium and calcium raw material and whole silica and irony raw material of regular sulpho-aluminate cement production; grinding for certain fineness; desining the C4A3S,C2S,C4AF and main mineral of cement clinker; Preparing sulpho-aluminate cement by alumina, lime carbonate, calcium sulfate and other burdens. The sulpho-aluminate cement has quick induration speed and high early strength.

The invention relates to a method for extracting metal scandium and titanium from red mud; the method is used for extracting scandium and titanium from the red mud; the method takes the red mud which is produced through the sinter process of the high-grade ore two portion of clinker in alumina plant as the raw material; the hydrochloric acid with a concentration of 2 percent to 6 percent is used for leaching the calcium and sodium from the red mud to increase the content of the scandium and titanium in the red mud; and then the hydrochloric acid with a concentration of 16 percent to 22 percent is used for a second acid dipping of the red mud and the product of scandium oxide is obtained after the leaching liquid passes the processes of extraction, reverse extraction and baking; the hydrochloric acid with a concentration of 80 percent to 90 percent is used for a third acid dipping of the red mud after the second one and the leaching liquid is added with iron powder for reduction and then the temperature is reduced to crystallize and separate out iron in the pattern of FeSO<4>.7H<2>O; the acid liquid which contains titanium after the iron is removed is added with alkali and heated for hydrolysis; the product of titanium oxide is obtained after the hydrolysate is baked. The method is simple and easy to be carried out and most metal elements in the red mud can be recovered and the cost for processing the red mud is low, all of which are beneficial to the comprehensive utilization of the red mud.

The invention discloses a heavy metal contaminated soil conditioner and a plant and chemistry combined remediation method. The heavy metal contaminated soil conditioner is a mixture of red mud and slaked lime. In the invention, the plant and chemistry combined remediation method is used, the pH of the soil is regulated by a chemical method, and heavy metals in the soil are absorbed by planting energy crops, hyperaccumulative plants and the like, thereby improving the soil properties, gradually reducing the content of heavy metals in the soil, finally achieving the purpose of soil remediation, improving the plant remediation efficiency, and being favorable to large-scale commercial application.

The invention discloses a method for preparing acid- proof fracturing propping agent with red mud. The comprised raw materials and their weight proportion are as follows: red mud 20- 60%, aluminium-containing substance 20- 60%, barium- containing substance 5- 35%, plasticizing agent 5- 15%. The method comprises following steps: (1) putting red mud and aluminium- containing substance into ball grinding tank for grinding respectively; (2) adding barium- containing substance and plasticizing agent into material got in steps (1), feeding it into ball grinding tank for grinding; (3) preparing material got in step (2) into semi- product particle; (4) calcinating material got in step (3) for 1- 3 hours, getting acid- proof crack propping product. The invention develops new way for red mud application, and provides effective method for increasing acid- proof performance for crack propping agent.

The invention discloses a novel red-mud-based grouting material and a preparation method thereof. The grouting material comprises the following components in percentage by weight: 70-80% of red mud, 20-30% of a mineral admixture, and an additionally-admixed composite alkali activator of which the modulus is 1.2-1.6, and the appropriate admixing amount is 8-12%. The novel red-mud-based grouting material prepared by using the red mud and the mineral admixture has good liquidity and relatively high early strength, can be used for reducing the influence on the environment by reasonably adopting industrial waste residues, and is simple in ingredients and low in manufacturing cost.

The invention relates to a burning-free geology polymer material of red mud coal ash and a preparation method thereof, belonging to the technical field of recycling inorganic nonmetal material and industrial solid waste. Kawazu mud powder and coal ash are taken as main substrate raw materials, building fine sands and building crushed stones are taken as aggregate, solid water glass powder is taken as alkali activator to prepare the burning-free geology polymer material of red mud coal ash. The raw materials comprise the following components based on parts by weight percent: 5-98% of the kawazu mud powder, 1-65% of the coal ash, 1-96% of the building fine sands and the building crushed stones, and 1-20% of the solid water glass powder. Counting the red mud+the coal ash+the building fine sands and the building crushed stones as 100%, the raw materials further comprise the following components based on parts by weight percent: 5-45% of water and 0.1-10% of calcium lignosulphonate. The preparation method comprises the steps of: dosing, mixing, aging, shaping, maintaining and drying, etc. The invention has the advantages of the high use ratio of industrial solid waste, the less pollution, the low energy composition and the simple operation of the preparation technology, and embodies the important meanings of environment protection, energy conservation and emission reduction.

The invention provides a method for high-efficiency separation and comprehensive utilization of iron, aluminum and sodium in high-iron red mud. The method comprises the following steps of adding iron ore concentrate and coke powder into high-iron red mud as a raw material, pressing the mixture into red mud pellets, drying, pre-heating, directly reducing metallic oxides of iron and sodium by a rotary hearth furnace, feeding the reduced metalized pellets into an iron bath-type oxy-coal smelting reduction furnace, carrying out high-temperature melting separation, using separated iron for steel-making, recovering alumina from the modified high-aluminum slag, recovering the metallic oxide of sodium from smoke dust carried by exhaust gas, improving quality of mixed gas produced by the iron bath-type oxy-coal smelting reduction furnace, and feeding back the treated mixed gas to the rotary hearth furnace for use. The method provided by the invention can effectively realize high efficiency recovery and large-scale industrial comprehensive utilization of a red mud resource.

The invention relates to anti-cracking alkali exciting ecological cement, which consists of A, B and C, and solid-phase mass ratio of the A to the B to the C is 5-10:75-90:5-15. The A is exciting agent, which comprises the following components by mass percentage: more than or equal to 80 percent of water glass of which modulus is 0.7 to 1.4, and less than or equal to 20 percent of one or a plurality of sodium sulfate, sodium phosphate, sodium carbonate, sodium chloride and magnesium chloride; and the A is prepared into solution containing more than or equal to 40 percent of solid for use. The B is a mineral additive, which comprises the following components by mass percentage: 30 to 70 percent of slag powder, and 30 to 70 percent of other additives, wherein the other additives comprise one or a plurality of siliceous dust, coal ash, metakaolin, red mud, burnt shale, colliery waste, steel slag and alloy slag, and is grinded to powder of which specific surface is 350 to 800m<2>/g. The C is active magnesium oxide, wherein mass content of MgO is more than or equal to 70 percent. The active magnesium oxide is calcined at a temperature of between 700 and 1,000 DEG C and then mixed and grinded with the B to become powder. The cement is the low-carbon discharge ecological cement with the advantages of high-early strength, durability, permeability resistance, corrosion resistance, freezing and thawing resistance, low heat of hydration, good cracking resistance, economy and environmental protection, and is used for civil construction, water conservancy, national defense, and oil well and mine passage support engineering.

The claimed invention is a method for separating Bayer process red mud from a Bayer process liquor which comprises adding to a Bayer process liquor containing red mud an effective amount of a water soluble synthetic flocculant, dextran and starch combination. The flocculant is added anywhere in the slurry containing the red mud suspended in Bayer process liquor, or in a liquor slurry containing bauxite prior to or during digestion. Once the flocculant combination is added, it is mixed sequentially with the Bayer process liquor and the red mud contained in the Bayer process liquor is removed by sedimentation, centrifugation or filtration.

The invention relates to an environmental protection based red mud combination modification synergism fire-retardant polyethylene, and belongs to the technical field of compressive utilization and fire-retardant plastics. The fire-retardant polyethylene is suitable for fire safety protection in important public places in the fields of electric products, building materials and transportation. The fire-retardant polyethylene consists of the following components in percentage by weight: 30 to 35 percent of polyethylene, 34 to 39 percent of red mud, 6 to 13 percent of red phosphorus, 5 to 17 percent of zinc borate, 3 to 8 percent of ethylene-vinyl acetate copolymer, 2 to 7 percent of grafted polyethylene, and 2 to 8 percent of silicone oil. The preparation process comprises the following steps of: grinding and drying the red mud; blending the ground red mud with other raw materials according to the blending ratio; mixing the mixture with polyethylene resin by fully stirring at a high speed; fusing, co-mixing and processing the mixture; and preparing a sample. The processing conditions comprise that: the roll temperature of a double-roller mixing mill is between 140 and 150 DEG C; and the forming temperature of the flat vulcanizing machine sample is between 120 and 130 DEG C, the heating time is between 4 and 8 minutes, and the pressure is between 10 and 20MPa. The fire-retardant system meets the requirements of industrial application on mechanical property, and simultaneously has comprehensive properties such as good fire-retardant effect, low cost, environmental protection and the like; moreover, the application field of the red mud is widened, and the red mud product with high added value is prepared.

The invention discloses an acidified zeolite. The technical scheme is as follows: the acidified zeolite is composed of zeolite, attapulgite clay, magnesia, hydrochloric acid, instant sodium silicate, polyvinyl alcohol, hydroxypropyl methylcellulose and sodium carbonate. The acidified zeolite materials are input into a mill and milled, and the milled powder is the acidified zeolite. The production method of acidified red mud adopts acidification before composite proportioning, thereby avoiding the chemical reaction between the sulfuric acid and the instant sodium silicate, polyvinyl alcohol, hydroxypropyl methylcellulose and sodium carbonate; and the acidified zeolite can effectively remove ammonia, iron, fluorine, phosphides and micro pollutants in domestic sewage, and can be used for removing or recovering heavy metal ions and treating radioactive waste. The acidified rear has the characteristics of favorable thixotropy, favorable heat stability, favorable plasticity and favorable binding property, and is suitable for producing drying agents, adsorptive separation agents, molecular sieves, catalysts, defluorination soil improvers, deodorizers and firefighting products.

The invention discloses a grouting material employing red mud as a raw material. The grouting material used in grouting engineering is a cement-based material, and the cement-based material is poor in stability, low in stone effect and low in binding power. The red mud is an industrial solid waste discharged from aluminum-making industry, so that the utilization rate is low, and the environment is polluted. The grouting material employing the red mud as the raw material comprises the following main components in parts by weight: 50-65 parts of red mud, 4-8 parts of an excitant, 20-40 parts of an active initiator, 1-5 parts of silica fume, 0.5-1 part of a retarder, 0.5-1 part of a surfactant and 0.5-1 part of a water-retaining agent. The grouting material has the advantages of good liquidity, high consolidation strength and wide grouting range, and the slurry is high in binding force with cement concrete and soil in the solidification process. The strength, stone rate and liquidity of the grouting material are improved; the liquidity of the prepared slurry is greater than 15s; the liquidity is still greater than 15s after the slurry is placed for 30 minutes; the stone rate is 99%; the 3d compressive strength is 3.2MPa; and the 28d compressive strength is greater than 12MPa.

The invention discloses a method for producing high-performance haydite from red mud, which comprises the following steps: taking 40-70 parts by weight of Bayer-process red mud, 0-30 parts by weight of sintering-process red mud, 5-20 parts by weight of fly ash and 5-30 parts by weight of clay material on dry basis as raw materials; evenly mixing the raw materials with 5-20 parts by weight of water, and putting the mixture on a pelletization plate to carry out pelletization, thereby obtaining the haydite fresh pellets; sintering the haydite fresh pellets, of which the diameters are 0.5-20mm, in a rotary kiln or sintering machine at 1050-1200 DEG C for 15-60 minutes; and quenching the sintered haydite to obtain the high-performance haydite product, of which the density level is 600-900, the water absorptivity is lower than 12%, the cylindrical compressive strength is higher than 7.5MPa and the strength grade is higher than 50MPa. The invention can effectively and massively utilize red mud as the raw material to produce the high-performance haydite, has the advantages of simple manufacturing technique and high product quality, and changes wastes into valuable substances.

The invention relates to a method for separating and recovering iron from red mud. The method is characterized by comprising the steps: of leaching out and removing iron from the red mud by using an oxalic acid solution, and filtering to obtain iron-free red mud and an iron oxalate-containing leaching solution, wherein the obtained iron-free red mud can be used as a raw material for producing cement and fireproof bricks; iron oxalate in the obtained leaching solution is reduced to ferrous oxalate through membrane electrolysis or adding a reducing agent and ferrous oxalate is precipitated out, or iron in the solution is separated by directly neutralizing and precipitating an iron hydroxide and oxalate mixture; obtained ferrous oxalate is decomposed to obtain oxalic acid and an iron-containing compound; the obtained iron hydroxide and oxalate mixture is selectively leached out, separated and recovered to obtain oxalic acid and an iron-containing compound; the process of returning recovered oxalic acid to the red mud to leach out and remove iron is cyclically used. The method has the characteristics of short technological process, good iron separation effect, simplicity and convenience in operation, environmental friendliness and the like, and is suitable for large-scale industrialized application.

The invention discloses a new method for resource comprehensive utilization of red mud and fly ash, and relates to a comprehensive utilization of industrial waste, specifically to a preparation method for a flocculating agent of aluminum ferric chloride and white carbon black. The method comprises the following steps: (1) acid leaching: the red mud and the activated fly ash are adopted as raw materials, and react with HCl, wherein the leaching temperature is 70-90 DEG C, a solid-liquid ratio is 10:1-10:3, the HCl concentration is 3-6 mol.L<-1>, the leaching time is 4-10 hours; (2) polymerization: Na2CO3 is added to a dissolution solution 1 to carry out telomerization, a dissolution solution 2 is added to the dissolution solution 1 until the dissolution solution 1 is stable, then the polymerization reaction is performed to obtain the polyaluminum ferric chloride, wherein the temperature is 60-70 DEG C, the pH value is 2.5-3.0, the aging time is 12-24 hours; (3) white carbon black preparing: a NaOH solution is adopted to carry out alkali dissolution to dissolve the filter residue, then treatments of acidification and calcination are performed to obtain the powder SiO2, wherein the alkali dissolution temperature is 80-100 DEG C, the time is 4-8 hours.

The invention discloses a method for comprehensively utilizing red mud, comprising the following steps: chloridizing roasting, namely roasting the mixture of the red mud, coal and calcium chloride; cinder treatment, namely obtaining magnetic iron slag and non-magnetic slag after magnetic separation is carried out to levigated cinder, and then separating the magnetic iron slag and non-magnetic slag; adding calcined soda or oxalic acid after levigation liquid and wash water are rich in mischmetal due to cyclic use, and then precipitating mischmetal slag; treatment of dry dust and circulation liquid, namely, after dry powder for roasting dust collection is collected, mixing the dry powder with scouring water which is used for tail gas circulation and then leaching soluble ScCl3 and GaCl3; after filter pressing, precipitating scandium by adding oxalic acid crystal in filtrate; carrying out filter pressing again, precipitating gallium and Ti(OH)4 by adding ammonia into the filtrate, dissolving obtained gallium-titanium slag with acid and then using P2O4 extractant to extract the gallium; and using extractant to extract the scandium after scandium precipitate is dissolved by acid, carrying out precipitation again by adopting back-extraction acid dissolving, and obtaining Sc2O3 by means of roasting. The method can realize recovery of valuable metals from the red mud, and secondary residual slag is totally used for building material production; and the method has environment protection effects and economic benefits, plays an important role in the development of recycling economy and is applicable to enterprises generating red mud.

The invention provides an ironmaking and aluminum extraction comprehensive utilization method of high-iron red mud. The method is characterized in that a blast furnace is used as main equipment; red mud is utilized to prepare micropellet composite sinter or pellet; micropellet composite sinter or pellet and coke are then treated with hot charging into the furnace layer by layer at no less than 400 DEG C; rich oxygen to full oxygen blast is employed; and tuyeres on the furnace body are increased, and reducing gas rich in hydrogen is blown into the furnace, so as to realize red mud ironmaking. At the same, calcium oxide is added during a deslagging process; the slag is treated with temperature control cooling to obtain self-pulverization calcium aluminate slag, which is leached and extracted with alumina; and sodium element is synchronously recovered from high temperature exhaust of the furnace top, so as to complete efficient separation and recycling of aluminum, iron and sodium in the red mud.