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19795 results about "Sodium hydroxide" patented technology

Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na⁺ and hydroxide anions OH⁻. Sodium hydroxide is a highly caustic base and alkali that decomposes proteins at ordinary ambient temperatures and may cause severe chemical burns. It is highly soluble in water, and readily absorbs moisture and carbon dioxide from the air. It forms a series of hydrates NaOH·nH₂O. The monohydrate NaOH·H₂O crystallizes from water solutions between 12.3 and 61.8 °C. The commercially available "sodium hydroxide" is often this monohydrate, and published data may refer to it instead of the anhydrous compound. As one of the simplest hydroxides, it is frequently utilized alongside neutral water and acidic hydrochloric acid to demonstrate the pH scale to chemistry students.

Method for preparing lithium cobaltate by directly using invalid lithium ion battery

The invention provides a method for preparing lithium cobaltate by directly using an invalid lithium ion battery. The method comprises the following steps: crushing the invalid lithium ion battery or scraps generated when a lithium cobaltate battery is produced by a mechanical crusher at normal temperature; adding water and one or more of acetic acid, sulfuric acid, hydrochloric acid or nitric acid to produce mixed aqueous solution of the battery scraps and acid; filling the mixed aqueous solution into a hermetic pressure reactor, and controlling the temperature in the reactor to be between 50 and 150 DEG C; introducing or adding one leaching additive of sulfur dioxide or hydrogen, or adding hydrazine hydrate; stirring and leaching, cooling, and filtering; adding one precipitator of sodium carbonate, potassium carbonate and ammonium carbonate, or adding composite precipitator consisting of one of the sodium carbonate, the potassium carbonate and the ammonium carbonate and one of sodium hydroxide and potassium hydroxide to obtain mixture of lithium carbonate, cobalt carbonate and cobalt hydroxide; drying and calcining at high temperature to produce a lithium cobaltate product. The method is particularly suitable for the treatment scale of medium-sized and small enterprises, and is an effective method for directly materializing cobalt secondary resources.

Method for producing aluminum oxide and co-producing active calcium silicate through high-alumina fly ash

ActiveCN102249253AExtraction is effective and cheapIncrease Al-Si RatioAlkaline-earth metal silicatesAluminium oxide/hydroxide preparationCalcium silicateSodium aluminate
The invention provides a method for producing aluminum oxide and co-producing active calcium silicate through high-alumina fly ash. The method comprises the following steps that: the high-alumina fly ash firstly reacts with a sodium hydroxide solution to carry out pre-desilication to obtain a liquid-phase desiliconized solution and a solid-phase desiliconized fly ash; lime cream is added to the liquid-phase desiliconized solution to carry out a causticization reaction, the resulting solid phase is active calcium silicate which is prepared through carrying out filter pressing, flash evaporation and drying to obtain the finished product; limestone and a sodium carbonate solution are added to the desiliconized fly ash to blend qualified raw slurry, then the blend qualified raw slurry is subjected to baking into the clinker, the liquid phase generated from dissolution of the clinker is a crude solution of sodium aluminate; the crude solution of the sodium aluminate is subjected to processes of first-stage deep desilication, second-stage deep desilication, carbonation, seed precipitation, baking and the like to obtain the metallurgical grade aluminum oxide meeting requirements. According to the present invention, the defects in the prior art are overcome; purposes of less material flow and small amount of slaggling are achieved; energy consumption, material consumption and production cost are relative low; extraction rate of the aluminum oxide is high; the calcium silicate with high added value is co-produced; the method provided by the present invention can be widely applicable for the field of chemical engineering.

Method for preparing nickel and cobalt doped lithium manganate by using waste and old lithium ionic cell as raw material

InactiveCN101450815ASimultaneous recyclingShort processManganates/permanganatesManganateManganese oxide
The invention discloses a method for preparing lithium nickel cobalt manganese oxide by taking a waste lithium ion battery as a raw material. The method is mainly characterized in that a waste lithium ion battery taking the lithium nickel cobalt manganese oxide, lithium nickel cobalt oxide and so on as a battery positive material is selected as the raw material and is pretreated through disassembly, separation, crushing, screening and so on, and then processes such as adhesive removal at high temperature and aluminum removal by sodium hydroxide are adopted to obtain an inactivated positive material containing nickel, cobalt and manganese; then a sulfuric acid and hydrogen peroxide system is adopted to leach, and P204 is adopted to remove impurities by extraction to obtain pure nickel, cobalt and manganese solution, and proper manganese sulfate, nickel sulfate or cobalt sulfate is blended to ensure that the mol ratio of nickel, cobalt and manganese elements in the solution is 1: 1: 1; and then ammonium carbonate is adopted to adjust the pH value to form a nickel cobalt manganese carbonate precursor, and then a proper amount of lithium carbonate is blended for high temperature sintering to synthesize a lithium nickel cobalt manganese oxide battery material. The first discharge capacity of the material is 150 mAh/g, the discharge capacity is still kept more than 130mAh/g after the circulation for 30 times, and the material has good electrochemical performance.

Production of biodiesel from combination of corn (maize) and other feed stocks

A method and system to produce biodiesel from a combination of corn (maize) and other agro feedstock may be simarouba, mahua, rice, pongamia etc. Germ is separated (either by wet process or dry process) from corn, crude corn oil extracted from germ and corn starch milk/slurry is heated and cooked in jet cooker to about 105 degree Celsius, enzymes added to convert starch into fermentable sugars in liquification and saccharification process and rapidly cooled down to about 30 degree Celsius. Simarouba fruits syrup, mahua syrup is mixed with corn starch milk (after saccharification). When yeast is added the fermentation takes place for about 72 hours. Thereafter the fermented wash is distilled to produce ethanol. Water consumed in dry process is very less compared to traditional wet process system. Corn oil and mixture of other oils is fed into transesterification (reaction) vessels where ethanol with catalyst, usually sodium hydroxide is added and reaction takes place for about a period of 2-8 hours. Crude biodiesel and crude glycerin as by-products is produced. Excess ethanol removed by distillation process. Crude biodiesel washed with warm water to remove residual soaps or unused catalyst, dried and biodiesel stored for commercial use. Oil extracted from spent bleach mud (used sodium bentonite), a waste product of edible oil refineries may also be utilized for economical production of biodiesel in combination of corn oil and ethanol.

Oleochemical Plasticizers with Thermal and Ultraviolet Radiation Stabilizing Activity for PVC Molding Resins and Process for Obtaining Thereof

The present invention is related with bioplasticizers or primary oleochemical plasticizers and the improved process for obtaining thereof. It refers primarily to epoxydized oleochemical plasticizers produced from vegetable oils, as substitute of traditional petrochemical plasticizers. The process starts with the epoxydized product of natural oils, such as sunflower, linseed, Jatropha curcas, soybean, etc., which are transesterified with an alcohol such as ethylic or methylic, in the presence of a catalyst such as sodium methoxide or sodium hydroxide in order to produce an alkylic esters mixture of the fatty acids that were present in the oil or oil mixture used as raw material in the epoxydized oil production. When the plasticizer obtained by the process already mentioned is used for the formulation of moldable poly(vinyl chloride), PVC, resins; the resulting plastic films get adequate hardness, static and dynamic thermal stability, and plasticizer extractability by solvents, such as n-hexane, gasoline and oil. Besides, when the PVC resin is formulated with a phthalic or terephthalic plasticizers mixture and the bioplasticizer, the bioplasticizer presents a full range solubility and or compatibility with the remainder of the resin compounds. The oxyrane chemical ring of the bioplasticizer is an excellent chemical neutralizer of the HCL that might be formed from the PVC, due to the action or interference of thermal or UV radiation.

Method for continuously synthesizing precursor of lithium ion battery positive material

The invention provides a method for continuously synthesizing a precursor of a lithium ion battery positive material, relating to an improvement of a synthesis method of a nickle cobalt manganese termary positive material nickle cobalt lithium manganate of the lithium ion battery positive material. The method is characterized in that the synthesis process is as follows: merging a complexing agent ammonia, an aqueous solution of metal nickle cobalt manganese ions and a precipitator sodium hydroxide solution and then continuously adding the substances into a reaction kettle for a synthesis reaction under the strong stirring condition in the presence of protective gas; and aging, filtering and washing the effluent from the reaction kettle, and then drying to obtain the lithium ion battery positive material precursor spherical nickle cobalt manganese termary hydroxide. The method has the advantages that the preparation process is continuous, the particle size of the prepared nickle cobalt manganese compound hydroxide powder is controlled in a range of 5-20 microns, and the prepared nickle cobalt manganese compound hydroxide powder is even in distribution and excellent in electrochemistry property. The method has the advantages of high production efficiency, low production cost and significant economic and social benefits, and the energy is saved.

Method for preparing anode material lithium nickle cobalt manganic acid of lithium ion battery

The invention relates to a preparation method of Ni-Co lithium manganate which is a cathode material for a lithium ion battery, which pertains to the field of new energy material and preparative technique. The preparation method comprises the following steps: 1. a sulfate mixture solution of nickel, cobalt and manganese is prepared in accordance with a certain concentration; 2. the mixture solution, NH3 water and a sodium hydroxide solution are continuously injected into a reactor and stirred, and a spherical or quasi-spherical multiple hydroxide A of Ni, Co and Mn is obtained after the filtration, washing and drying are conducted over the mixture; 3. the dry multiple hydroxide A of Ni, Co and Mn is presintered to obtain a spherical multiple oxide B of Ni, Co and Mn; and 4. after being added with a right quantity of alcohol, the product B is evenly mixed with lithium hydroxide and the mixture is sintered, smashed and screened to obtain a spherical LizNixCoyMnxO2 cathode material C for the lithium ion battery. With the preparation method, the particle size and distribution of the product A and product B are easy to control and the spherical Ni-Co lithium manganate C with stable quality, high density, high capacity and high discharge plateau is obtained; therefore, the preparation method is applicable to stabilizing industrial production.

Preparation of doped cobaltic-cobaltous oxide

Disclosed is a process for preparing a doping cobaltosic oxide, which relates to a method for the production of a modified cobaltosic oxide used for a Lithium-ion battery anode material. The method is characterized in that the preparation process comprises: 1) mixing a cobalt nitrate solution containing doped chemical ions with a mixed precipitator solution containing ammonia and sodium hydroxide and making the mixture react for eight to twenty hours at a pH value of between 8.4 to 10 and a temperature of between 40 and 80 DEG C so as to prepare a cobalt hydroxide precipitation containing doped chemical; and 2) washing and drying the cobalt hydroxide precipitation containing the doped chemical and then burning the precipitation for two to six hours at a temperature of between 500 and 800 DEG C so as to obtain the doping cobaltosic oxide. The method of the invention can get even particles with regular shapes after the reaction, the particle sizes of the doping cobalt hydroxide are controllable in a certain range, and the doping cobaltosic oxide can be obtained by calcinations. The method of preparation is characterized in that a magnesium source, an aluminum source, a titanium source, etc. are induced to the cobalt nitrate solution directly, and the process and operation are simple and easy.

Method for recycling lithium, nickel, cobalt and manganese from waste ternary anode material

The invention discloses a method for recycling lithium, nickel, cobalt and manganese from a waste ternary anode material. The method comprises the steps of with the waste ternary anode material as theraw material, adding a carbon reducing agent, carrying out mixing and dosing, carrying out roasting reduction at 500-700 DEG C in a protective atmosphere, adding the roasted product into water, carrying out water-soluble reaction, after the reaction is finished, filtering to obtain lithium carbonate filtrate and a filter residue I, carrying out sulfuric acid leaching on the filter residue I so asto obtain a filtrate containing nickel, cobalt and manganese and a filter residue II, adding sulfate so as to adjust the proportion of nickel, cobalt to manganese in the filtrate containing nickel, cobalt and manganese, carrying out precipitation reaction on the filtrate containing nickel, cobalt and manganese, a sodium hydroxide solution and an ammonia water solution in the protective atmosphere, controlling the reaction temperature at 50-70 DEG C and the pH value at 10-11, obtaining ternary precursor slurry after the precipitation reaction, filtering, washing, and drying, so as to obtain the ternary precursor. The method has the beneficial effects that the separation condition of lithium carbonate is simple, the costs of leaching processes of nickel, cobalt and manganese and the regeneration process of the ternary material precursor are low, and the recycling rate is high.
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