262 results about "Nickel content" patented technology

The invention provides a ternary precursor and a preparation method thereof, a positive electrode material and a preparation process thereof, and a battery. The ternary precursor comprises an inner core, and a transition layer and a shell which are sequentially coated outside the inner core, the nickel content of the inner core is gt; the nickel content of the transition layer is gt; and the nickel content of the shell. The inner core in the ternary precursor has the highest nickel content, so that the capacity of the positive electrode material prepared from the ternary precursor is ensured; the nickel contents of the inner core, the transition layer and the shell are changed in a gradient manner, so that the thermal stability of the ternary precursor is improved; the shell reduces the interface side reaction between the positive electrode material prepared from the ternary precursor and an electrolyte; the transition layer can be used as a buffer layer between the inner core and the shell, so that the ternary precursor and the structural stability are improved. Therefore, the battery containing the positive electrode material prepared from the ternary precursor has excellent capacity and cycling stability at normal temperature and high temperature.

The invention relates to the technical field of nuclear fusion devices, and discloses a fusion device cooling pipe welding method and welding device.The fusion device cooling pipe welding method comprises the following steps that two cooling pipes to be welded are prepared; an adapter is welded to the welding face of one cooling pipe, and the nickel content of the adapter is higher than that of the cooling pipe; the radial interior of the adapter and the to-be-welded face of the adapter are polished; the two cooling pipes are assembled, so that the welding face of the other cooling pipe is in butt joint with the to-be-welded face of the adapter; and carrying out self-fusion welding on the adapter and the other cooling pipe. According to the welding method for the cooling pipe of the fusion device, the problem that the magnetic conductivity of the cooling pipe exceeds the standard is solved, and meanwhile the welding quality and the welding qualification rate of the cooling pipe are improved.

The invention discloses a process for treating nickel wastewater containing nickel acetate cleaning water and nickel acetate concentrated water, which comprises the following steps: S1, filtering nickel wastewater, S2, carrying out primary concentration treatment, S3, carrying out secondary concentration treatment, S4, treating by a sodium metaaluminate method, S5, carrying out collaborative filtration treatment, and S6, discharging RO (Reverse Osmosis) produced water up to the standard. The method comprises the following steps: primarily enriching nickel ions by adopting primary nickel concentration treatment and secondary nickel concentration treatment, adding a sodium metaaluminate solution into a mixed solution, enabling the pH value of the mixed solution to be 8-12, enabling the nickel ions to react with hydroxyl ions to generate a nickel hydroxide precipitate, adding a sulfuric acid solution to adjust the pH value of the mixed solution back to 6.5-7.5, hydrolyzing sodium metaaluminate to generate an aluminum hydroxide precipitate, and carrying out secondary nickel concentration treatment on the aluminum hydroxide precipitate; aluminum hydroxide adsorbs nickel hydroxide to form a composite precipitate, aluminum ions and nickel ions are subjected to a competitive complexation reaction, and a flocculating agent is added into a mixed solution to form a flocculent precipitate, so that the reaction time is short, the nickel content in the nickel sludge can be greatly increased, the treatment period can be shortened, and the operation cost can be reduced.

A golf club head has a loft no less than 38°. The golf club head also comprises a material having a material composition that includes an Iron content that by weight is highest of all constituents. The material composition also has a Chromium content no less than 10.5% by weight and a Nickel content no greater than 0.5% by weight.

The application discloses a method for improving the quality of high-nickel steel and belongs to the technical field of high-nickel steel continuous casting. The method comprises the following steps: continuously casting high-nickel steel liquid with a nickel content of not less than 3.5% in a continuous casting machine; controlling the temperature of a slab entering and leaving a two-cooling zone of the continuous casting machine and the opening shrinkage value of a casting roller of the two-cooling zone during the continuous casting process, so that the slab is pressed down and high-quality high-nickel steel is obtained; wherein the temperature of the slab entering and leaving the two-cooling zone of the continuous casting machine is 1100-1150 DEG C and 800-900 DEG C respectively, and the opening shrinkage value of the casting roller of the two-cooling zone of the continuous casting machine is 1.6-4.5 mm. The method provided by the application realizes solute element redistribution, slows down the defects of element central segregation, and thus improves the quality of high-nickel steel.

A brake disc for a disc brake may have a braking band made of gray cast iron or steel, provided with two opposite braking surfaces, each of which defines at least partially one of the two main faces of the disc. The disc is provided with a base layer constituted by steel having a nickel content of at most 15% which covers at least one of the two braking surfaces of the braking band.

The invention provides an anti-wear and anti-friction gradient nanostructure Ni coating which comprises a coating a with the grain size of 430-530 nm, an amorphous belt layer a, a coating b with the grain size of 100-140 nm, an amorphous belt layer b and a coating c with the grain size of 27-33 nm which are sequentially arranged on a metal base material from inside to outside. The thickness ratio of the plating layer a to the plating layer b to the plating layer c to the amorphous ribbon layer a to the amorphous ribbon layer b is (10-10.5) [mu] m to (8.5-9) [mu] m to (1.45-1.65) [mu] m to (30-40) nm to (3-5) nm; the content of nickel in the plating layer a, the plating layer b, the plating layer c, the amorphous ribbon layer a and the amorphous ribbon layer b is not less than 99.9 at%. Meanwhile, the invention further discloses a preparation method of the anti-wear and anti-friction gradient nanostructure Ni coating. The plating layer is the gradient nanometer Ni plating layer with the grain size in the gradient change trend from inside to outside, the amorphous zone layer exists between the plating layers with different grain sizes, the hardness value of the gradient nanometer metal Ni plating layer is higher, the friction coefficient and the wear rate are lower, and the gradient nanometer metal Ni plating layer has excellent wear resistance and friction reduction performance.

The invention relates to steel for liquefied natural gas and a manufacturing method thereof, the steel comprises the following components in percentage by weight: 0.03-0.10% of C, 0.10-0.30% of Si, 0.8-1.5% of Mn, less than or equal to 0.005% of S, less than or equal to 0.006% of P, 5.0-6.5% of Ni, 0.10-0.30% of Mo, 0.1-1.0% of Cr and the balance of Fe and other inevitable impurities, and the components also need to simultaneously meet the following conditions: more than or equal to 10.5% of 4C + 2Ni + Mn-5Mo-0.5 Cr; and not less than 2.0% of 5C + 1.1 Mn + 1.8 Cr + 3.5 Mo. Under the condition of low nickel content, the steel plate has high deformation allowance in a low-temperature environment of-196 DEG C, so that the steel plate has high service safety; the yield strength of the steel plate is larger than or equal to 585 MPa, the tensile strength is 680-820 MPa, the ductility is larger than or equal to 18%, the impact energy at the temperature of-196 DEG C is larger than or equal to 150 J. The performance of the steel plate is similar to that of traditional 9Ni steel, but the cost is lower, and the steel plate can be used for manufacturing land storage tanks and containers of liquefied natural gas (LNG) and LNG transport ships.

The invention discloses a method for low-temperature synthesis of an ultra-high nickel single crystal positive electrode material based on a molten salt fluxing agent method, which comprises the following steps: mixing an ultra-high nickel precursor with the nickel content of more than or equal to 90% with a lithium source according to a stoichiometric ratio, then adding a certain mass of sodium chloride (NaCl) as a fluxing agent medium, and fully grinding; the mixed material is subjected to temperature programming sintering in an oxygen-containing atmosphere, and the highest sintering temperature is controlled between 700 DEG C and 850 DEG C; and cooling, washing, drying and sieving the sintered product to finally obtain the small-size ultrahigh-nickel single-crystal positive electrode material with good dispersity. By introducing the low-melting-point molten salt fluxing agent, the growth temperature of the single crystal is remarkably reduced, lithium volatilization and abnormal growth and agglomeration of crystal grains are effectively inhibited, and the obtained single crystal particles are uniform in size (2 microns) and have a good layered structure and electrochemical performance. The method is simple in process, low in cost and suitable for large-scale production of the ultrahigh-nickel single-crystal positive electrode material for the high-performance lithium ion battery.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method and system for removing heavy metals in wastewater, and the system comprises a collecting tank, a regulating tank, a Fenton-ultrasonic synergistic reaction tank, an addition and reduction sedimentation tank, a flocculation tank, a first sedimentation tank, a three-cavity nickel removal tank, a second sedimentation tank, a multi-parameter monitoring tank, an A / O tank, a third sedimentation tank and a clean water tank which are communicated in sequence. Discharging the adjusted wastewater containing the heavy metals into a Fenton-ultrasonic synergistic reaction tank to realize complex breaking of the complex-state heavy metals; adjusting the wastewater subjected to complex breaking treatment to be neutral, so that heavy metals are converted into hydroxide precipitates, and most of the heavy metals are removed at the stage; discharging the treated water into a flocculation tank, standing and precipitating, and enabling supernate to enter a nickel removal tank; and an organic sulfur catching agent is added into the nickel removal tank to strengthen chelation reaction, so that the nickel content is less than 0.1 ppm. According to the system, through four-stage cooperation of oxidation, precipitation, dynamic capture and intelligent feedback, the complex nickel removal problem is solved, and the comprehensive heavy metal removal rate is larger than or equal to 99.5%.

The present application relates to the technical field of nuclear fusion device, disclose a kind of welding method of fusion device cooling pipe, wherein, the welding method of fusion device cooling pipe includes the following steps: preparation two cooling pipes to be welded;Welding adapter on the welding surface of one of the cooling pipes, the nickel content of the adapter is higher than the nickel content of the cooling pipe;The radial interior of adapter and the welding surface to be welded of adapter are polished;Two cooling pipes are matched, so that the welding surface of another cooling pipe is connected with the welding surface to be welded of adapter;Self-fusion welding is carried out on the adapter and another cooling pipe.The welding method of fusion device cooling pipe of the embodiment of the present application not only solves the problem of excessive magnetic permeability of the cooling pipe, but also improves the welding quality and welding qualification rate of the cooling pipe.

The invention discloses a method for preparing a copper-nickel alloy for a solid-state battery through an alkaline system, and belongs to the technical field of solid-state batteries. A pyrophosphate aqueous solution system is used as an electrolyte, and the copper-nickel alloy is prepared through an electro-deposition method; the pyrophosphate aqueous solution system comprises the following components: raw materials of copper pyrophosphate and nickel chloride, a main complexing agent of potassium pyrophosphate, an auxiliary complexing agent of ethylenediaminetetraacetic acid or potassium sodium tartrate, a brightener and an additive. The components and thickness of the alloy are adjusted by changing the metal ion concentration, the input amount of the complexing agent and the like and changing the technological parameters (pH, current density, electrodeposition time and the like), the copper-nickel alloy with the tensile strength reaching 1012.70 MPa, the elongation reaching 5.27% and the nickel content being 8.93% can be prepared, the corrosion resistance is excellent, the coating thickness is uniform, electrodeposition can be conducted at the normal temperature, and the copper-nickel alloy can be used for preparing the copper-nickel alloy with the tensile strength reaching 1012.70 MPa, the elongation reaching 5.27% and the nickel content reaching 8.93%. Therefore, the method is suitable for large-scale industrial production.

Disclosed herein are a nickel-based lithium metal composite oxide, a method of preparing the same, and a lithium secondary battery including a positive electrode including the same. The nickel-based lithium metal composite oxide includes: secondary particles including an aggregate of primary particles, in which a nickel content in the nickel-based lithium metal composite oxide is 50 mol% or more, the secondary particles including large secondary particles having a particle size of 10 m or more and small secondary particles having a particle size of 5 m or less, the nickel content in the large secondary particles is greater than the nickel content in the small secondary particles, the nickel content in the large secondary particles is 85 mol% to 99 mol% based on the total content of the transition metal in the nickel-based lithium metal composite oxide, and the nickel content in the small secondary particles is 75 mol% to 89 mol% based on the total content of the transition metal in the nickel-based lithium metal composite oxide.

A method for contamination control when growing yeasts is provided. Bacterial contamination is controlled by using urea as the primary nitrogen source while simultaneously limiting the amount of nickel available to contaminating bacteria. Bacteria require nickel as a cofactor for urease enzymes in order to use urea for growth while yeasts do not require nickel as a cofactor for any enzymes. Nickel is limited by using metals in heat exchangers that do not leach nickel. Ethyl carbamate is limited by using a carbon / nitrogen ratio that consumes all urea during fermentation. After fermentation completes, yeast is recycled using centrifugation, enabling use of high concentrations of yeast to reduce fermentation time from 48 hours to 12 hours and to eliminate bacterial contamination from growth on free amino nitrogen.

This invention discloses a 440MPa grade steel plate with ultra-low temperature toughness and its preparation method, belonging to the field of steel materials technology. It solves the contradiction between insufficient strength and toughness grades and excessive nickel content in existing low-temperature steels. The composition of the 440MPa grade steel plate with ultra-low temperature toughness, by mass percentage, includes: C: 0.030%–0.085%, Si: 0.18%–0.38%, Mn: 0.95%–1.35%, P: ≤0.010%, S: ≤0.003%, Cr: 0.01%–0.25%, Mo: 0.01%–0.15%, Ni: 3.20%–4.25%, Cu: 0.12%–0.85%, Nb: 0.008%–0.035%, Al: 0.02%–0.036%, Ti: 0.008%–0.022%, with the balance being Fe and other unavoidable impurities. The steel plate of this invention exhibits excellent strength and low-temperature toughness.

A process for steam reforming a hydrocarbon feedstock containing one or more nitrogen compounds, including passing a mixture of the hydrocarbon feedstock and steam through a catalyst bed of one or more nickel steam reforming catalysts disposed within a plurality of externally heated tubes in a tubular steam reformer, each tube having an inlet to which the mixture of hydrocarbon and steam is fed, an outlet from which a reformed gas containing hydrogen, carbon monoxide, carbon dioxide, steam, ammonia and methane is recovered. The steam reforming catalyst at least at the outlet of the tubes comprises nickel dispersed over a porous metal oxide surface present as a coating on a non-porous metal or ceramic structure The nickel content of the metal oxide coating is in the range of 5 to 50% by weight and the thickness of the coating is in the range of 5 to 150 micrometres.

The invention relates to a method for measuring and analyzing nickel, silicon and phosphorus in nickel-containing pig iron, in particular to the technical field of detection and analys.The measuring and analyzing method comprises the steps that a nickel-containing pig iron sample is drilled, sampled and separated through a hard alloy drill bit, and a test sample is obtained; sequentially carrying out acid dissolution, solid-liquid separation and constant volume on the obtained test sample to obtain a test solution; measuring the contents of nickel, silicon and phosphorus in the obtained test solution by adopting a full-spectrum direct-reading inductively coupled plasma emission spectrum; a standard curve used in the full-spectrum direct-reading inductively coupled plasma emission spectrum measurement is obtained by dissolving a gradient nickel-containing pig iron standard sample to a constant volume. According to the determination and analysis method provided by the invention, the detection process is designed, so that the nickel, silicon and phosphorus elements in the nickel-containing pig iron with the nickel content of 8-15% can be jointly determined, and a scientific data basis is provided for production management and control.

The invention discloses a nickel-titanium memory alloy pipe as well as a preparation method and application thereof. The preparation method comprises the following steps: providing a nickel-titanium memory alloy bar, wherein the content of nickel in the bar is 54-58%; the bar is holed, and a pipe with the preset inner diameter is obtained; the pipe is drawn for multiple times through the empty drawing diameter reducing technology so as to reduce the diameter of the pipe, and after drawing is conducted every time, the area variable of the pipe does not exceed 15%; performing special-shaped treatment on the pipe subjected to diameter reduction to obtain a special-shaped pipe; and the special-shaped pipe is placed into a special-shaped forming module to be subjected to heat treatment, the memory alloy function of the special-shaped pipe is activated, so that a target pipe with the phase transition temperature ranging from-20 DEG C to 60 DEG C is obtained, the heat treatment temperature of the special-shaped forming module ranges from 500 DEG C to 530 DEG C, and the shaping duration ranges from 25 min to 35 min. The preparation method is simple in process, and the obtained target pipe can form a uniform and fine metallic luster surface, can be directly used as a structural appearance part, and has good environmental adaptability.

The present invention relates to the field of 3D printing technology, and in particular to a 3D printing method for Invar alloy and an optical microscope mount. The 3D printing method for Invar alloy is suitable for Invar alloy with an iron matrix, a nickel content in the range of 30% to 40%, and a powder particle size in the range of 15μm to 53μm. The 3D printing method for Invar alloy comprises the following steps: step a, dividing the target product to be printed into a main body and a flexible part; step b, setting the printing parameters of the main body and the printing parameters of the flexible part respectively, and then performing 3D printing; step c, heat treating the 3D printed product. The Invar alloy printed by this method has a low thermal expansion coefficient and excellent mechanical properties. The thermal expansion coefficient of the Invar alloy printed using the above parameters is 0.3×10‑6℃‑1~1.0×10‑6℃‑1 (20℃~100℃), the tensile strength is above 400MPa, and the elastic modulus is above 150GPa, which can meet the high-precision requirements of precision instruments.

The invention discloses equipment and a method for producing a potassium chloride reverse flotation reagent by adopting a granular copper-nickel catalyst, and relates to the technical field of salt lake chemical engineering. The equipment comprises a reaction kettle, a stirring shaft, a stirring paddle, a stirring basket, an upper stirring paddle, a lower stirring paddle and the like; on the basis of a powder catalyst, macroporous pseudo-boehmite and an acid solution are added, the powder catalyst is prepared into particles, and the particle type catalyst is matched with special production equipment to be used for producing the potassium chloride reverse flotation reagent. Compared with the prior art, the invention has the beneficial effects that the granular catalyst is combined with the special production equipment provided by the invention, the technical effect equivalent to the activity of a powder catalyst can be realized, the content of the target product is 85% or above, the highest content reaches 93.07%, the content of copper and nickel in the product is 10 ppm or below, the harm to salt pan brine is greatly reduced, and the production cost is reduced. The problem that flotation reagents and catalysts are difficult to separate which puzzles enterprises for many years is solved.

The invention relates to a press-in pin (10) comprising a main body (12) and a coating (20) which covers the base body (12) at least in sections and has an original barrier layer (22) and a functional layer (24). The original barrier layer (22) consists of at least 80 percent by mass of nickel and the functional layer (24) consists of 30 to 72 percent by mass of silver and / or copper and / or bismuth and / or indium (alloy metals), the remainder being tin and impurities. In order to achieve high temperature resistance, the functional layer has a thickness (d2) of at least 0.7 micrometres (figure 2).

The present application relates to big data measurement technical field, specifically for the intelligent measurement method and system of concealed nickel ore body nickel content based on big data, including the following steps, obtains response sequence and constructs difference structure, extracts boundary mutation analysis trend increment, purifies path ratio and determines the generation of measurement record.In the present application, the mutation characteristics in response change are identified by constructing difference direction trend, the effective data segment is screened by combining numerical difference and path response stability, the noise optimization and trend purification of complex change path are realized, the abnormal area of nickel content distribution is accurately positioned based on the comprehensive comparison of space distance and response amplitude ratio, the matching ability of space information and response relationship is enhanced, the identification precision of nickel content abnormal area in deep invisible area is improved, the measurement deviation caused by single numerical dependence is avoided, the measurability and practicality of the result are ensured, and the continuity intelligent identification and efficient measurement of unexposed target are realized.

In the present invention, a slurry for a second cathode mixture is applied to both edge regions of an electrode sheet holing portion during storage of an electrode sheet having a high content of nickel, wherein the edge regions are vulnerable to moisture penetration and high in rolling reduction ratio and the slurry contains a cathode active material more resistant to rolling than that applied to the center region of the holding portion, whereby the reactivity of nickel and moisture is suppressed as much as possible to improve the lifespan characteristics of the battery.

The invention relates to the field of material surface treatment, in particular to a chemical polishing solution and a polishing method. The chemical polishing solution is suitable for the ferro-nickel alloy with the nickel content of 20-60% and the doped element content of less than 1%, and comprises an accelerant, a first acidic agent, a second acidic agent, a corrosion inhibitor, a brightener and a solvent. The first acidic agent comprises at least one of sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid and hydrofluoric acid, and the content is greater than or equal to 5%. The second acidic agent comprises at least one of ammonium bifluoride, ammonium fluoride, formic acid, benzoic acid, acetic acid, propionic acid, butyric acid, lactic acid, oxalic acid, malonic acid, tartaric acid, malic acid and citric acid, and the content of the second acidic agent is 1%-50%. The total content of the first acidic agent and the second acidic agent is 6-60%. The accelerant is used for oxidizing metal nickel and metal iron, and the content of the accelerant is 0.01%-5%. And the content of the corrosion inhibitor is 0.1-5%. By combining the accelerant, the first acid agent, the second acid agent and the corrosion inhibitor, the dissolving speed of the nickel phase and the iron phase is balanced, the surface flatness is improved through the brightening agent, and the polishing effect is improved.

The application discloses an improved iodine oxidation-dimethylglyoxime spectrophotometry for detecting the content of nickel in steel, which comprises the following steps: obtaining an acidolysis solution by acidolysis of the steel to be detected; then diluting the solution to obtain a mother liquor to be detected; mixing the mother liquor to be detected with an ammonium citrate solution, water, an iodine solution, ammonia water and a dimethylglyoxime solution to obtain a chromogenic solution to be detected; and placing the chromogenic solution to be detected below a critical temperature to perform spectrophotometry to obtain the content of nickel in the steel to be detected. The application controls the adding amount of the ammonium citrate and the dimethylglyoxime in the chromogenic solution to be detected and the chromogenic temperature, so that the stable time of the absorbance of the chromogenic solution to be detected is greater than or equal to 60 minutes, the detection of the content of copper in the steel to be detected is less than or equal to 0.2%, and the probability of the result of the detection of the content of nickel in the steel to be detected (0.10%-50%) exceeding the allowable error of a navigation mark is less than or equal to 5%.

A copper alloy wire formed from a copper alloy containing iron, phosphorus, tin, and auxiliary elements, the remainder comprising copper and unavoidable impurities, the auxiliary elements being two or more elements selected from the group consisting of zinc, nickel, and chromium or being only zinc, the iron content being 0.1-1.0 mass%, and the balance being copper and unavoidable impurities. The content ratio of phosphorus is from 0.1 mass% to 0.6 mass% (inclusive), the content ratio of tin is from 0.1 mass% to 0.4 mass% (inclusive), the content ratio of zinc when zinc is contained is from 0.005 mass% to 1.40 mass% (inclusive), the content ratio of nickel when nickel is contained is from 0.005 mass% to 0.70 mass% (inclusive), the content ratio of chromium when chromium is contained is from 0.005 mass% to 0.20 mass% (inclusive), and the balance of zinc and unavoidable impurities. The mass ratio of the total content of iron, nickel, and chromium to the content of phosphorus is 3.0-7.0.

The invention provides a method for smelting nickel-containing steel grade by using a diamond wire, which comprises the following steps: adding the diamond wire, scrap steel and molten iron into a converter for oxygen blowing smelting to obtain converter molten steel; the converter molten steel is transferred into a steel ladle for deoxidation treatment, and deoxidized molten steel is obtained; transferring the deoxidized molten steel into a refining furnace for desulfurization and deoxidation to obtain refined molten steel; the refined molten steel is subjected to nickel adjusting treatment, and nickel-containing molten steel is obtained; and the nickel-containing molten steel is subjected to continuous casting treatment, and the nickel-containing steel billet is obtained. Wherein the absolute value of the difference value between the actual nickel content in the nickel-containing molten steel and the target nickel content in the nickel-containing molten steel is not larger than 0.005%. According to the method provided by the invention, the diamond wire is added into the converter along with the scrap steel and the molten iron, and the diamond wire is molten through oxygen blowing smelting, so that the nickel yield is ensured, the use amount of the nickel-iron alloy is greatly reduced under the condition that the nickel content in the prepared nickel-containing steel grade reaches the preset target value, the cost is reduced, and the production benefit can be effectively improved.

The application relates to the technical field of solar photovoltaic cells, in particular to a high-nickel conductive paste for N-type Topcon cells and a preparation method thereof, which is composed of, in mass percentage, nickel powder 40-80%, micron-level high-activity polycrystalline silver powder 5-50%, nickel powder sintering-aid glass powder 0.5-3% and organic carrier 5-12%. The nickel powder sintering-aid glass powder is low-Tg high-viscosity nickel powder sintering-aid glass powder after composition optimization; the low softening point ensures good fluxing effect; the high viscosity ensures the dispersion stability of silver-nickel particles and precisely controls the etching range, and meanwhile, the glass layer thickness after sintering is controlled in a proper range; through optimization of the nickel powder sintering-aid glass powder and the silver powder, the nickel doping amount is successfully increased to 40-80%, meanwhile, the cell efficiency is ensured to be better than or equivalent to that of pure silver paste, the reliability is good, and the paste truly has mass production capacity and value.

The present invention provides a method for producing a slurry composition for a secondary battery positive electrode. The slurry composition for a secondary battery positive electrode comprises an organic solvent, a specified polymer, and a positive electrode active material having a specified composition. The specified polymer comprises a nitrile group-containing monomer unit and a linear alkylene structural unit having 4 or more carbon atoms. Furthermore, the pH of an extract obtained from the specified polymer by a specified method is 3.5 or higher and less than 6.0. Furthermore, the positive electrode active material is an active material having a high nickel content.

A process for steam reforming of a hydrocarbon feedstock containing one or more nitrogen compounds is described, the process comprising: passing a mixture of the hydrocarbon feedstock and steam through a catalyst bed consisting of one or more nickel steam reforming catalysts placed in a plurality of externally heated tubes in a tubular steam reformer, wherein each tube has an inlet to feed the hydrocarbon and steam mixture and an outlet to recover a reformate gas containing hydrogen, carbon monoxide, carbon dioxide, steam, ammonia and methane, and wherein at least at the outlet of the tube, the steam reforming catalyst is a structured steam reforming catalyst comprising nickel dispersed on the surface of a porous metal oxide present as a coating on a non-porous metal or ceramic structure, wherein the nickel content in the metal oxide coating is in the range of 5 to 50 wt.-% and the thickness of the coating is in the range of 5 to 150 micrometers.