496results about How to "Reduce alkali consumption" patented technology

The invention relates to a complex heavy-metal waste water emergency quick treatment method, comprising the following steps of: filtering by a sand filter; mixing by a high-speed pump; carrying out an ultraviolet catalyzing ozone reaction; carrying a microwave catalyzing active carbon reaction; carrying micro-electrolytic reaction; circulating waste water; carrying out a Fenton reaction; carryingout electric flocculation on an aluminum electrode plate; and pressing and filtering sludge. Waster water in a circulating slot is pumped into an iron carbon fluidized bed by a fluidizing pump to be circularly treated; an air compressor is connected with the iron carbon fluidized bed and prevents a filler in the iron carbon fluidized bed from blocking; and the microwave active carbon reactor is an active carbon filling tower, and a microwave emitter is arranged outside the body of the active carbon filling tower. The complex heavy-metal waste water emergency quick treatment method disclosed by the invention is used for treating the complex heavy-metal waste water, associated devices are simple, easy, quick, can meet an emergency, and can update and convert, no various chemical raw materials are fed, and various complex heavy-metal waste water with unknown elements can be quickly treated as long as the current magnitude is regulated, and thus the heavy metal in the waste water and chemical oxygen demand can immediately reach the standard and are discharged.

The invention discloses a method for desulfurizing acid gas containing hydrogen sulfide and recycling sulfur. The method for desulfurizing acid gas containing hydrogen sulfide and recycling sulfur sequentially comprises the following steps: introducing the acid gas into a combustion furnace to be mixed with air introduced by the other pipeline so as to carry out a combustion reaction; introducing the gas reacted in the combustion furnace into a cooler to be cooled to 230-250 DEG C, after cooling, separating the cooled liquid sulfur at a liquid outlet, introducing mixed gas in the combustion furnace into a catalyst reactor, enabling hydrogen sulfide to react with sulfur dioxide in the catalyst reactor so as to generate sulfur and water, and separating the generated liquid sulfur at the liquid outlet of the catalyst reactor; introducing the mixed gas in the catalyst reactor into a hydrogenation reactor and enabling the sulfur dioxide to react with hydrogen in the hydrogenation reactor; introducing the gas in the hydrogenation reactor into a hydrogen sulfide absorption device and preparing the hydrogen sulfide into elemental sulfur under the action of an alkaline solution, a complex catalyst and the introduced air. The method for desulfurizing acid gas containing hydrogen sulfide and recycling sulfur has the advantages of short process route, high quality of produced sulfur and low energy consumption, is capable of fully removing SO2 gas and is green and environmentally friendly.

The invention discloses a method for preparing dissolving pulp by carrying out steam explosion on crop straw and adopting a prehydrolytic sulfate process. The method has the following advantages: steam explosion and washing are adopted to remove about 80% of hemicellulose, 10% of lignin and 72% of inorganic salt in advance and the excellent long fibers and the short fibers are separated through mechanical carding, thus solving the problems of short fibers of the crop straw, prominent non-uniformity and high ash content; the excellent long fibers obtained through separation are cooked by a sulfate process; the prepared dissolving pulp has excellent performances and can replace wood pulp, thus widening the application range of the dissolving pulp; at the same time, the washing solution obtained after steam explosion and washing and the fine fibers obtained through carding and screening are directly used for fermenting biogases; the cooking black liquor undergoes acid precipitation and washing to prepare high-purity lignin; and the excellent long fibers of the crop straw are used for preparing the dissolving pulp and the fine fibers, the hemicellulose and the lignin are simultaneously effectively separated and utilized, thus realizing comprehensive utilization of the straw resources, being beneficial to reduction of the production cost and realizing industrialized application.

A method to produce aluminum oxide with middle-low bauxite relates to a method to produce aluminum oxide with middle-low bauxite by the means of Bayer-method. The invention is characterized in that: during the Bayer-method process, digestion process is to add dealuminization slag instead of lime as additive in middle-low bauxite to do Bayer process digestion; after digestion and backward washing of red mud, the red mud is mixed with recycle alkaline liquor, the lime is added, the digestion reaction is done, the red mud is separated from the slurry and discharged outside, the solution part obtained oppositely washes with Bayer-method, is sent to Bayer-method system to supplement alkali after digesting the red mud, the lime is added partly and is reacted, then, dealuminization slag and recycle alkaline liquor that goes through Bayer-method red mud wet treatment are gotten and dealuminization slag calcium aluminate hydrate instead of lime is added into the Bayer process digestion. The method of the invention belongs to all wet treatment, has simple process, low energy consumption, low alkali consumption and high recovery rate of aluminum oxide and is suitable for treating Chinese bauxite that is mainly middle-low bauxite; besides, the resource utilization is high, the amount of discharged red mud is low and the red mud is easy to be utilized comprehensively.

The invention relates to a multifunctional bio-charcoal and a preparation method thereof. According to the technical scheme, the preparation method comprises the steps of dipping biomass into 1-15wt% caustic alkali solution for 1-50h, washing with water to be neutral, and drying to obtain treated biomass; then charring the treated biomass in a tube furnace in mixed gas at 300-900 DEG for 1-130h to obtain the multifunctional bio-charcoal. The biomass is one of rice straw, wheat straw, sawdust, wood, green grass, fruit peel and animal tissue waste; the biomass contains 30-60wt% of volatile organic carbon of charcoal, 10-40wt% of fixed carbon, 1-30wt% of ash and 10-60wt% of water. The preparation method disclosed by the invention has the characteristics of low production cost, high yield, simple process, controllable production process and environment friendliness, and the prepared multifunctional bio-charcoal has a good adsorption effect on heavy metals and high stability and can be used for repairing water bodies, solid matrixes and soil which are polluted by heavy metals.

The invention relates to a method for recycling silicon powder from silicon slice cut waste mortar. The invention comprises seven procedural steps of solid-liquid separation of silicon slice cut waste mortar, precision separation of silicon-contained liquid, liquid flotation, precision filtering, film separation, pickling and vacuum drying. The method in the invention is used to produce silicon powder with a purity of 99.5-99.9% and solve the problems existing in the existing silicon slice cut waste mortar recycling industry, such as difficult separation between solid and liquid, low purity of recycled products, poor recycling rate, incomplete recycling process and the like. In the invention, the polyethylene glycol and carborundum can be recycled and the recycling of polycrystalline silicon and monocrystalline silicon can be realized, which improves the material recycling ratio of the solar equipment industry and come up to the cleanness standards.

This invention is a chemical wood pulp productive method. It contains following steps: 1) To soak, Put the thin piece wood plate into the soak liquid container, the soaking temperature is 50-90 deg.C. Soaking time is 15-50 minutes; the soak liquids use part or whole boiling liquid. 2) To relieve squeeze and press; relieve the pressed wood plate, the pressing ratio is 3-6:1. 3) To take-out lignin: put the pressing wood plate and its soak liquid into the boiler, boiling them to do the reaction of take-out lignin.

The invention provides a method for modifying a Bayer process, processing low-grade diaspore bauxite and producing alumina. The method comprises steps that: (1) silicon is chemically pre-removed, wherein the low-grade bauxite is immersed into a sodium aluminate solution containing a stabilizing agent, such that a slurry containing dissolved silica is obtained; (2) obtained high-silicon sodium aluminate solution is processed through desilication, wherein desilication crystal seeds are added to the slurry processed through filtration, such that desilication is carried out; (3) the sodium aluminate solution is processed through seed precipitation, wherein aluminum hydroxide crystal seeds are added to the sodium aluminate solution processed through desilication, such that seed precipitation is carried out; (4) the obtained aluminum hydroxide product is baked, such that an alumina product is obtained; (5) a high-pressure dissolution process is carried out, wherein the obtained seed precipitation mother liquor is processed through evaporation and alkali supplementation, and is used in high-pressure dissolution of a concentrate obtained in the step (2); a stabilizing agent is added to the obtained sodium aluminate solution, the sodium aluminate solution is then used for processing the next batch of bauxite, and the steps (1) to (4) are repeated. The method provided by the invention is suitable to be used for processing low-grade diaspore bauxite. With the method, a silicon scaling problem in alumina industries can be effectively solved, energy consumption can be substantially improved, and the quality of the finished product alumina can be improved.

The invention provides a continuous alkali activation device and method for preparing activated carbon with high specific surface area. The method includes the following steps: enabling uniformly-mixed alkali-carbon mixture to be subjected to pre-activating, activating and potassium elementary substance conversion treatment through a pre-activating reactor, a continuous activating oven and an activating product collector respectively, so as to obtain the activating product; and enabling the activating product to be subjected to acid-washing, washing and drying to obtain a final activated carbon product. Inside a continuous vertical activating oven, the alkali-carbon mixture and a carrier gas continuously flow and are contacted in the reverse direction, pass by a warming section, a constant temperature section and a cooling section, so that generated elementary substance potassium during the activated process furthest circulates inside the activating oven, the intercalation function of potassium on graphite microcrystal in carbon is enhanced, carbon activation is facilitated, the activating effect and utilizing efficiency of alkali are improved, the product quality and production efficiency of activated carbon are improved, alkali consumption and production cost are reduced, and environmental pollution is reduced; and meanwhile, the activating product collector is further arranged inside the continuous activating device for safe conversion of K elementary substance, and the prevention of potential safety hazard brought by residual K in the activated product is eliminated.

The invention relates to a method for preparing high-purity vanadium pentoxide by use of a stone coal one-step method. The technical solution is as follows: a fluidized bed furnace for one-step roasting of stone coal is adopted to perform one-step fluidized bed roasting on the stone coal; roasted materials are leached in three segments, final pickling slurry is subjected to primary separation so as to obtain final pickle liquor, secondary overflow is returned to be subjected to primary size mixing, and tertiary overflow is returned to be subjected to secondary size mixing; the pH value of the final pickle liquor is regulated, and slags obtained after regulation are returned to a segment III so as to be leached; the regulated pickle liquor is crystallized to obtain a potassium alum byproduct; after crystallization, the liquid is subjected to reduction and precipitation-based impurity removal, and filter residues are dried to obtained a ferrous oxalate byproduct; after impurity removal, pH value regulation is performed on the liquid by use of weak acid salt, then counter-current extraction is performed on the liquid, and extraction raffinate is returned to be subjected to tertiary size mixing; after being washed, the loaded organic phase is subjected to countercurrent reverse extraction; a lean organic phase is regenerated and then is returned to be extracted; after a vanadium-rich solution is oxidized, urea is added, stirring is performed, the obtained molybdenum precipitation mother solution is returned to be subjected to primary size mixing, and ammonium polyorthovanadate is calcinated to prepare vanadium pentoxide. The method has the characteristics of short process flow, less pollution, low energy consumption, less chemical usage, high vanadium recovery rate and high product purity.

The present invention relates to a method for producing chemical fibre pulp by using plant fibre as raw material. Said method includes the following several steps: raw material treatment, making the treated raw material undergo the processes of rubbing and extruding, cooking, washing, removing sand and bleaching treatment. It is characterized by that in the preparation process of said chemical fibre pulp a screw extruding machine and a rubbing-extruding machine are adopted.

The invention provides a grey cloth cold batch mercerizing process method for cotton and cotton blended fabric, which belongs to a dyeing and finishing pretreatment process for cotton and cotton blended fabric. The process method comprises processes of singeing, alkali padding, rolling, reverse rolling and heaping, washing, oxygen bleaching, weft finishing and tentering; in the alkali padding process, alkali liquor is padded by using a padding liquor roller, the NaOH content of the alkali liquor in an alkali liquor tank is 160 to 180 grams per liter, the balance is water, and the alkali liquor in the alkali liquor tank is circulated by using a circulating pump; in the washing process, counter current washing is performed in a de-sizing machine by using 90 to 95 DEG C hot water, the speed is 48 to 52 meters per minute, and the cloth falls with tide; and in the oxygen bleaching process, the speed is 45 minutes per minute, the temperature in a track-type steam box is between 96 and 99 DEG C, and the heaping is performed for 45 minutes. The mercerizing process method combines the mercerizing process and the de-sizing process into a one-step process so as to shorten the process flow, reduce the steam consumption, relatively reduce the consumed caustic soda quantity and save the wastewater treatment expense.

The invention relates to a method for extracting gallium and germanium from zinc smelting slag, in particular to a method for wet extraction of gallium and germanium metals from zinc smelting slag. The method is characterized in that: in the extraction process, the zinc smelting slag is subjected to two-stage acid leaching, the gallium is leached out in the first stage, and then the acid leaching slag after the gallium is leached out is subjected to the second-stage acid leaching, so that the germanium is leached out. According to the method, the leaching characteristics of scattered metal enriched slag gallium and germanium and the extraction characteristics of the gallium and the germanium are found in experiments, a process flow that the gallium and the germanium are leached out and extracted by steps to enrich the gallium and the germanium is provided, so that the germanium leaching and extraction form a closed loop, the alkali neutralization work procedure is eliminated, the alkali consumption is eliminated, the acid consumption is reduced, and the wastewater drainage is reduced.

The invention discloses a method for making crust element which comprises the following steps that: a crab shell which is cleaned and soaked for the first time is put into a sodium hydrate solution for heat preservation; the crab shell which is washed by tap water to the neutral is soaked for the second time, the acid liquor is scoured off by the tap water; the curst element soaked by hydrochloric acid is put into the sodium hydrate solution for heat preservation and then is fished out as well as is washed by the tap water to the neutral, and the crust element is obtained. The method for making chitosan by the crust element comprises the following steps that: the crust element is put into the sodium hydrate solution and is sealed, after temperature preservation and the reaction, the mixture is soaked by the tap water and is washed by the tap water; the processed chitosan is taken out to be dried and put into the sodium hydrate solution as well as be sealed while preserving the temperature, after the reaction, the chitosan is taken out and is soaked in the tap water as well as is taken out and dried, thereby obtaining the chitosan. By processing by the method, the reaction speed is increased by 30 times, the alkali liquor dosage is reduced by 50 percent; the made crust element has white color, the crust element is washed by water and soaked to produce the chitosan, the molecular weight is great, the deacetylation is more than or equal to 95 percent, and the viscosity coefficient is more than or equal to 2000MPa.S.

The invention relates to a pre-treatment process method of high acid crude oil. The method comprises the following steps that high acid crude oil is treated by coupling deacidification and electro-desalting processes by combining chemical extraction and electro-desalting; a first level tank is taken as a deacidification and electro-desalting tank; a demulsifier and an extractant are injected before a crude oil electro-desalting static mixer; after being fully mixing with crude oil, the mixture enters into the first level desalting tank; generated naphthenate and salt-containing sewage in the crude oil are dissolved in the extractant; treated deacidified oil enters into second and third level desalting tanks after being mixed with the demulsifier and water through the static mixer for desalination and dehydration; treated crude oil enters into a subsequent heat exchange unit; after a period time of operation of an electro-desalting system, impurities such as mud in raw material oil are flushed by a non-stop back purge device to discharge mud-containing sewage out of the tank; an extract phase is acidified to separate out naphthenic acid which is further extracted and purified by light dydrocarbon, and the extractant is purified and recovered and recycled.

A process for treating the Cr-contained sewage includes preparing liquid-state ferrous sulfate by displacement reaction, removing oil from said sewage, adding said liquid-state ferrous sulfate, reduction reacting to reducing 6-valence Cr to 3-valence Cr, adding alkali to generate deposit of chromium hydroxide, deposit separation, discharging water, and press filter of mud.

The invention relates to flax fibers. The strength of the flax fibers is 3.0 to 8.0cN/dtex and the fineness of the flax fibers is 1,500 to 3,500 Nm; preferably, the strength of the flax fibers is 4.0 to 7.0cN/dtex and the fineness of the flax fibers is 1,500 to 3,000Nm; more preferably, the strength of the flax fibers is 4.5 to 6.5cN/dtex and the fineness of the flax fibers is 1,800 to 2,800Nm; and optimally, the strength of the flax fibers is 5.0 to 6.0cN/dtex, and the fineness of the flax fibers is 2,300 to 2,700Nm. The invention also relates to the preparation method of the flax fibers, which comprises the steps of acid impregnation, washing, oxidization, fiber spinning, oil feeding, oil and water removal, fiber softening, oil feeding and wetting, stowing and mechanical loosing. The flax fibers provided by the invention have high strength and fineness. The preparation method is short in process and light in pollution.

The invention discloses an novel alkyl aryl alkyl-sulfonate surfactant composition and its application in tertiary oil recovery, the surfactant-alkali-polymeric ternary oil driving system prepared from the surfactant and the underground crude oil can reach a ultralow interfacial tension of 0.0001-0.00001 mN/m, thus can effectively substitute the residual oil in the oil reservoir, the crude oil recovery factor can be increased by over 30%.

The invention provides a method for adding CO2 and O2 in-ground leaching in heavy carbonic acid type ground water and leachate, which comprises the following steps: (1) adding CO2 and O2 into the leaching solution to leach uranium underground to obtain uranium leachate; (2) adding uranium to the uranium Add CO2 to the leaching solution to adjust the pH value of the uranium leaching solution, and then filter it mechanically; (3) perform ion exchange adsorption on the uranium leaching solution in the adsorption tower; (4) perform leaching on the saturated resin to obtain Cl-type poor resin and leaching qualified solution (5) transforming the Cl-type poor resin with the adsorption tail liquid; (6) acidifying the eluting qualified liquid, adding alkali and aging precipitation at room temperature, washing, filtering and drying the precipitated slurry to obtain uranium products. The method of the invention only adds O2 and CO2 without adding other reagents, which will not cause blockage of ore beds and pollution of underground water; at the same time, the preparation process is integrated, the operation is simplified, and the cost is saved.

The invention discloses a technique for preparing high-purity praseodymium from an industrial praseodymium raw material. According to the technique, a high-purity praseodymium (99.99%-99.9995%) product is prepared from industrial praseodymium (98%-99.9%). The technique consists of three fractional extraction systems: cerium-praseodymium/praseodymium-neodymium grouping separation, cerium/praseodymium separation and praseodymium/neodymium separation, wherein separation of cerium-praseodymium from neodymium is realized in an extraction section of the cerium-praseodymium/praseodymium-neodymium fractional extraction system; separation of cerium from praseodymium-neodymium is realized in a washing section of the cerium-praseodymium/praseodymium-neodymium fractional extraction system; the cerium/praseodymium separation fractional extraction system is directly serially connected to the praseodymium/neodymium separation fractional extraction system. Compared with an existing technique, the technique has the advantages that alkali consumption (including alkali for saponification and alkali for neutralization) is reduced by 13%, and acid consumption (including acid for washing and acid for reextraction) is reduced by 13%.

The invention belongs to the technical field of dissolving pulp preparation and relates to a stewing method for preparing bamboo wood dissolving pulp, which comprises the following steps of: (a) introducing vapor to a boiler: preparing bamboo wood raw materials into slice materials, conveying the slice materials to a digester, and introducing low pressure vapor to the digester while conveying theslice materials; (b) vapor heating and pre-hydrolyzing: heating through the vapor after introducing the vapor to the boiler to pre-hydrolyze the slice materials; (c) neutralizing through white liquor: neutralizing the slice materials and vapor condensed water in the digester through the white liquor in a hot white liquor tank; (d) replacing through hot black liquor: replacing the neutralization liquid waste in the digester through the hot black liquor in a hot black liquor tank; (e) heating and stewing in a temperature control manner to prepare virgin pulp of the bamboo wood dissolving pulp; (f) replacing the washing black liquor, washing and cooling the virgin pulp; and (g) discharging at a low temperature. The invention has the advantages of reducing the production cost, increasing the production efficiency, effectively utilizing the stewing heat and improving the yield and the quality of the bamboo wood dissolving pulp.

The present invention relates to a mechanical pulping method of bamboo pulp, including the procedures of raw material treatment, extrusion to extract fibre, soaking-softening and grinding to make pulp. It is characterized by that the procedure of extrusion to extract fibre uses bamboo pulp-making machine to extrude bamboo material, and separates the bamboo fibre from bamboo juice liquid uner the action of high temp. and high pressure to extract bamboo fibre. The soaking-softening procedure includes the steps: soaking bamboo fibre in hot alkali water whose alkali content is 1%-5% for 1-2 hr. and softening and dissolving lignin and hemicellulose; and the grinding and pulping procedure is to place the soaked bamboo fibre in pulp grinder and grind it to obtain monomer fibre pulp stock.