56results about How to "Simple cleaning" patented technology

The invention belongs to the technical field of production of vitamin A and its derivatives, in particular to a method for preparing vitamin A acetate. The method comprises the following steps: (1) mixing triphenylphosphine and acid in supercritical CO2, and then contacting the obtained mixture with vinyl-beta-ionol for salt formation to obtain C15 phosphine salt; (2) after adding solvent water, ionic liquid and C5 aldehyde to the finished system of step (1) , CO2 is released for solvent replacement, and the materials are uniformly mixed; (3) adding an extractant to the system after the solvent replacement of step (2), stirring and adding an alkali solution for Wittig reaction to obtain the vitamin A acetate. The method of the invention has mild reaction conditions, safe production and easy control, and the purity and reaction yield of the final product are high.

The invention belongs to the technical field of graphene preparation and relates to a method for preparing single-layer graphene through a mechanical method. A specific technological process of the method comprises three steps of a hydroxylation process, a decontaminating process and a reduction process. The edge of natural flake graphite is processed in a carboxylation mode through a ball milling method to obtain initial carboxylation graphene powder, then pure carboxylation graphene powder with small iron content is obtained through the decontaminating process, and high-quality single-layer graphene is obtained through the thermal reduction process. The method avoids any strong oxidant and has high carboxylation degree, short ball milling time and high success rate; the decontaminating process is simple and effective; the reduction process avoids using reducing agents and is environmentally friendly; a main structure of a ball milling tank related to the hydroxylation process comprises a pressure meter, a gas exhaust valve, a tank body, a sealing cover and a stainless steel ball. The method has high preparation success rate, large yield, no pollution and low energy consumption and can achieve large-scale mechanical production through amplifying ball milling equipment.

The coal slurry reactant sampling device includes one sampling container connected through pipes with valves to the material conveying pipeline; solvent oil pipes with valve; hydrogen pipes; one gas sampling pipe in the upper part of the sampling container; one sampling pipe in the lower part of the sampling container; and one inert gas pipe communicated to the sampling container. The coal slurry reactant sampling device is accurate and reliable in sampling, convenient and safe in operation, and can sampling repeatedly.

The invention provides a method for preparing battery grade lithium hydroxide monohydrate. The method utilizes crude lithium carbonate as a raw material, and includes the following steps: acid dissolution, preliminary impurity removal, deep impurity removal, evaporation concentration, preparation of lithium hydroxide by ion-exchange membrane electrolysis, evaporation crystallization, and recrystallization. The method is rich in source of raw material and has the advantages of recycling and utilizing resources, and being less in type of contained impurities and easy to remove; chlorine gas polluting the environment is not produced and product sulfuric acid can be reused to dissolve, and consumption of raw materials is reduced; and the pH of an anolyte is controlled by controlling a circulation anolyte to increase the efficiency of current.

The invention discloses a method for producing nadroparin calcium from a heparin sodium crude product. The method comprises the following steps: dissolving the raw material crude product heparin sodium in water, precipitating by centrifugation and secondary salting-out to remove impurities in the heparin sodium crude product, carrying out nitrous degradation and reduction to obtain low-molecular heparin containing free sulfates, adding barium chloride to remove the free sulfates generated by degradation, and using an anion exchange resin and adjusting to appropriate parameters to carry out calcium conversion and final impurity removal; and finally, carrying out oxidation decolorization, sterile filtration and dehydration to obtain the nadroparin calcium raw material. By using the crude product heparin sodium as the raw material, the production cost is lowered; the technical steps are simplified to enhance the yield of the nadroparin calcium and reduce the titer loss of the nadroparin calcium; and the method can ensure the safety of the product, and is convenient for industrialized mass production.

The invention discloses a potassium removal process of a production system for lithium extraction from ore, belonging to the field of wet metallurgy. The invention particularly relates to the field of lithium salt production, and aims to solve the problems of long potassium removal process flow and high potassium removal operation difficulty in conventional removal of potassium in lepidolite. The potassium removal process comprises the following steps: conducting neutralization and nitrate removal through evaporation to generate potassium-rich sodium precipitation mother liquor; adding ferric salt into the potassium-rich sodium precipitation mother liquor with an adjusted pH value to obtain potassium-containing mother liquor; heating the potassium-containing mother liquor to 95 DEG C, and conducting stirring, reacting and crystallizing for 1-3 hours to obtain a suspension; and settling the suspension, carrying out solid-liquid separation, adjusting the pH value of a supernatant to 5-7 by using calcium carbonate, and removing iron. The process is short in process flow, convenient to control, simple in subsequent impurity removal, compatible with a sulfuric-acid-method lithium extraction process, simple in design and easy to implement.

The invention discloses a direct-seeding seed production method for two-line system hybrid rice. The method comprises the steps of seeding, field management, purity assurance and harvesting storage, wherein the seeding step comprises the following sub-steps: selecting Huanghuazhan as a male parent, examining and approving a sterile line in promotion mix as a female parent; taking a large-area Huanghuazhan planting area as a seed production field before use; fixing the sowing time according to the sowing date of the male and female parents, and ensuring flower synchronization of the male and female parent; ensuring that the sowing plot width of the male parent is equal to the harvesting width of a harvester, the sowing plot width of the female parent is 1-2 times that of the harvesting width of the harvester, and the spacing between the male parent and the female parent is 40-60cm, so that the male and female parents are conveniently and respectively harvested with machine; and manually transplanting a line of male parents at the seedling age of 22-25 days of the male parent, wherein 2-3 rice seedlings are planted in each stump, the row spacing is 25-40cm, and the spacing between the male parent transplanting line and the direct seeding male parent is 20-30cm. According to the method disclosed by the invention, the problems that the female parent is susceptible to lodging, the seed production yield is low, the weeding difficulty is high, the purity of hybrid seeds is low, the production efficiency is low and the cost is high are solved.

The invention discloses a special grinding ball of titanium dioxide for grinding in titanium dioxide industry and a preparation method thereof. The raw materials of the grinding ball comprise the following components by weight percent: 3.40%-3.80% of C, 2.30%-2.60% of Si, 0.60%-1.00% of Mn, 0-0.035% of S, 0-0.35% of P, 0-0.03% of nanometer alloy modifier, 0.01%-0.03% of rare earth magnesium and the balance of steel scrap (Fe). The preparation method of the special grinding ball is based on the alloy cast ball casting technology and comprises the steps of changing chemical compositions and adjusting heat treatment technology. The special grinding ball of titanium dioxide prepared by the formulation and preparation method of the invention has extremely low chromium alloy content, high hardness and low wear and out-of-roundness, and titanium dioxide grinded by the grinding ball has high purity, good whiteness and high quality.

The invention relates to a method for preparing vanadium-nitrogen alloy through stone coal vanadium extraction vanadium-rich liquid. According to the technical scheme, a carbonaceous reducing agent is added into the vanadium-rich liquid, stirring and drying are conducted, and a precursor is obtained; the vanadium-rich liquid is an intermediate product of stone coal vanadium extraction; the molar weight of the carbonaceous reducing agent is 1.5-4 times the total molar weight of positive ions in the vanadium-rich liquid, the precursor is mechanically pressed into a block shape, at the ordinary pressure and a nitrogen atmosphere, the blocky precursor is subjected to heat preservation for 1-5 h under the condition of 1000-1400 DEG C, then cooled with a furnace and levigated, and a second intermediate product is obtained; a hydrochloric acid solution is added into the second intermediate product, stirring and solid-liquid separation are conducted, and solid slag is obtained; the molar weight of HCl in the hydrochloric acid solution is 3-5 times the total molar weight of positive ions except vanadium positive ions in the vanadium-rich liquid; and the solid slag is dried and briquetted, and the vanadium-nitrogen alloy is obtained. The method has the characteristics that the stone coal vanadium extraction vanadium-rich liquid is used as a vanadium source, the production cost is low, the raw material consumption is low, and the reaction time is short.

The invention discloses a water scale removing device for a water mixing valve. The water scale removing device comprises the water mixing valve and water inlet pipes, and the water scale removing device is arranged on the parts, in front of the water mixing valve, of the water inlet pipes. The water scale removing device comprises a shell and a cylindrical filter screen, the shell is of a three-cavity T-shaped pipe structure, the long pipe is a vertical pipe, the short pipe is a horizontal pipe, a step table is arranged at the lower end of the inner wall of the vertical pipe, an end opening of the lower end of the inner wall of the vertical pipe is sealed, a discharging port is formed in the position, close to the bottom, of the lower end of the vertical pipe, and the discharging port is sealed through a screw and a sealing ring. The two ends of the tubular filter screen are through, the outer diameter of the tubular filter screen is matched with the diameter of the inner wall of the water inlet pipe, the tubular filter screen is arranged in the vertical pipe, the upper end of the tubular filter screen is higher than the top of the inner wall of the horizontal pipe, and the other two end openings of the shell are connected with the water inlet pipes. The water scale removing device is additionally provided with a filter device, a user can remove dirt regularly, the problem that water scale and other impurities enter a valve element of the water mixing valve, the sealing performance of the valve element is damaged, and the sensitivity of the valve element becomes invalid is solved, and the water scale removing device has the advantage that cleaning is convenient and fast.

The invention relates to a method for preparing manganese carbonate through ammonia leaching by taking ammonium hydrogen fluoride as an additive and belongs to the field of wet-process metallurgy of manganese ore. The method comprises the following steps: (1) roasting manganese ore to obtain manganese ore roasted sand; (2) carrying out ammonia leaching on the manganese ore roasted sand obtained inthe step (1) by taking ammonium hydrogen fluoride as the additive; and (3) carrying out ammonia distillation on filtrate obtained in the step (2) to obtain a manganese carbonate product. Through themethod, the problem of manganese leaching rate in the existing manganese ore ammonia leaching technology is solved; the method has the advantages that the leaching rate of manganese in the manganese ore ammonia leaching process is obviously increased, the method is simple and convenient to operate and mild in leaching condition, and the produced manganese carbonate product is high in purity.