64 results about "Total calcium" patented technology

The present invention relates to a process for producing high purity lithium hydroxide monohydrate, comprising following steps: concentrating a lithium containing brine; purifying the brine to remove or to reduce the concentrations of ions other than lithium; adjusting the pH of the brine to about 10.5 to 11 to further remove cations other than lithium, if necessary; neutralizing the brine with acid; purifying the brine to reduce the total concentration of calcium and magnesium to less than 150 ppb via ion exchange; electrolyzing the brine to generate a lithium hydroxide solution containing less than 150 ppb total calcium and magnesium, with chlorine and hydrogen gas as byproducts; producing hydrochloric acid via combustion of the chlorine gas with excess hydrogen and subsequent scrubbing of the resultant gas stream with purified water, if elected to do so; and concentrating and crystallizing the lithium hydroxide solution to produce lithium hydroxide monohydrate crystals.

The present invention relates generally to methods of in vitro diagnostics, in particular the use of a compound selected from the group consisting of fibroblast growth factor 23 (FGF23), inorganic phosphorus (P), the product of inorganic phosphorus and total calcium (P×tCa), osteopontin (OPN) and parathyroid hormone (PTH) as biomarker. Said biomarkers can be used to monitor the modulation of fibroblast growth factor receptor (FGFR) kinase activity, in particular its inhibition, and / or the occurrence of secondary effects of FGFR inhibition. The invention further provides methods and kits relating to these uses.

The present invention relates to a process for producing high purity lithium hydroxide monohydrate, comprising following steps: concentrating a lithium containing brine; purifying the brine to remove or to reduce the concentrations of ions other than lithium; adjusting the pH of the brine to about 10.5 to 11 to further remove cations other than lithium, if necessary; neutralizing the brine with acid; purifying the brine to reduce the total concentration of calcium and magnesium to less than 150 ppb via ion exchange; electrolyzing the brine to generate a lithium hydroxide solution containing less than 150 ppb total calcium and magnesium, with chlorine and hydrogen gas as byproducts; producing hydrochloric acid via combustion of the chlorine gas with excess hydrogen and subsequent scrubbing of the resultant gas stream with purified water, if elected to do so; and concentrating and crystallizing the lithium hydroxide solution to produce lithium hydroxide monohydrate crystals.

The invention discloses a method for measuring calcium sulfate in desulfuration gypsum, which is characterized by comprising the following steps of: 1, preparing a lime slurry sample; 2, measuring the total calcium content and the total sulfur content of the sample by using an ICP method; 3, measuring the calcium sulfite content of the sample by using a volumetric method; and 4, obtaining the content of calcium sulfate, namely subtracting the calcium sulfite content measured in the third step from the total sulfur content measured in the second step to obtain the content of the calcium sulfate. The method for measuring the calcium sulfate in the desulfuration gypsum has the advantages of simple operation, short analysis time, high analysis precision and capability of meeting field processrequirements.

The invention discloses a method for simultaneously determining total calcium, sulfate calcium and calcium sulfite in desulfurized fly ash. The method comprises the following steps: decomposing the calcium sulfite to lead calcium sulfite radical to be volatilized out in sulfur dioxide by acid; precipitating barium sulfate; determining the calcium sulfate by an indirect titration method; oxidizing the calcium sulfite into the calcium sulfate; precipitating the total sulfate radical; and realizing the calcium sulfite determination by difference reduction of the total sulfate radical and the sulfate radical. With the adoption of the method, the interference of substances such as calcium hydroxide and calcium chloride is eliminated; the barium sulfate is precipitated and needs not to be filtered; after the acidity is adjusted, the direct titration can be carried out; the method is simple and rapid to operate; titration is carried out by a potential titrimeter; and the simultaneous determination of the total calcium, the sulfate calcium and the calcium sulfite is realized. With the adoption of the method, the defect that an iodine method is not suitable for determining the calcium sulfite in the desulfurized fly ash is greatly overcome, and meanwhile, the content of the total calcium can be determined, so that the condition that the total calcium, the sulfate calcium and the calcium sulfite in the desulfurized fly ash at each stage in a metallurgy sintering smoke gas dry method and semi drying method desulfurizing process can be accurately determined is realized; and the simultaneous determination method is shortened for 3-5 times compared with the method for determining three components respectively.

The present invention concerns a multipart fluid system for use in CRRT, wherein the multipart fluid system comprises an anticoagulation fluid and at least one fluid from the group consisting of a dialysis fluid and an infusion fluid. According to the invention the anticoagulation fluid comprises at least 8 mM citrate, and the dialysis fluid and / or infusion fluid comprises 2-8 mM citrate and 1-5 mM total calcium. The present invention further concerns a system for regional citrate anticoagulation in an extracorporeal blood circuit.

The invention discloses a bone-strengthening drug quality detection method, and belongs to the drug quality detection technical field. The adopted technical scheme comprises that the bone-strengthening drug is made into capsules by an artificial tiger bone powder and auxiliary materials, and the quality detection method includes the following determining steps: 1) after the bone-strengthening drug is hydrolyzed, determining the content of total amino acids in the samples, wherein each capsule contains not less than 65 mg of the total amino acids; and 2) determining the content of total calcium in the bone-strengthening drug by adopting atomic absorption spectrophotometry, wherein each capsule contains not less than 55 mg of calcium. The determination method for determining the content of the total amino acids in the preparation by adopting microwave hydrolysis and automatic online derivation, using a full-automatic amino acid analyzer or adopting traditional hydrolysis and PITC derivation method and using high performance liquid chromatography is established, the determination method for determining the content of calcium in the samples by adopting the atomic absorption spectrophotometry is increased, the accuracy and advancement of the quality detection method is ensured, and the product quality of Jintiange capsules can be effectively controlled.

The invention discloses a method for determining the content of free calcium oxide in steel slag. The method comprises the following steps: 1, carrying out heating decomposition of a steel slag sample in inert atmosphere, and using a weight loss caused by the water volatilization during the heating decomposition of the slag sample to calculate the content of Ca(OH)2; 2, determining the content of free total calcium in the steel slag sample subjected to the heating decomposition; and 3, subtracting the Ca(OH)2 content by the amount of the free total calcium to obtain the content of the free calcium oxide. The determination utilizing a principle that calcium oxide can be generated after heating Ca(OH)2 is characterized in that a water evaporation weight loss method is used to calculate the content of calcium hydroxide (Ca(OH)2), a simple easy-implementation determining method is used to determine the amount of free total calcium, and finally an accurate free calcium oxide value is obtained. The determination method disclosed in the invention changes a present situation of the result inaccuracy caused by the interference of Ca(OH)2, and has the characteristics of short use time, accurate result, and maneuverability of all above processes.

The present invention concerns a multipart fluid system for use in CRRT, wherein the multipart fluid system comprises an anticoagulation fluid and at least one fluid from the group consisting of a dialysis fluid and an infusion fluid. According to the invention the anticoagulation fluid comprises at least 8 mM citrate, and the dialysis fluid and / or infusion fluid comprises 2-8 mM citrate and 1-5 mM total calcium. The present invention further concerns a system for regional citrate anticoagulation in an extracorporeal blood circuit.

The invention relates to a gradient adjustment method of limestone content in a wet desulphurization circulating liquid. The method comprises the following steps: detecting the flow rate of waste flue gas entering a desulfurizing tower and the sulfur dioxide content in the waste flue gas, and detecting the sulfur dioxide concentration in flue gas at the outlet of the desulfurizing tower; determining the opening number of spray layers according to the total amount and concentration of sulfur dioxide in the waste flue gas, and optimizing the limestone content in the mixed slurries entering the spray layers. The total new added calcium / sulfur ratio in the mixed slurry of all the opened spray layer is 1:(1.03-1.05); in the mixed slurries of all the spray layers from top to bottom, the limestone content sequentially lowers, thereby forming the limestone content gradient distribution along the spray layers in different heights; and when the desulfurization load of the desulfurizing tower changes along with the changes of the sulfur dioxide concentration and total amount in the waste flue gas, the limestone slurry amount is adjusted according to the total calcium / sulfur ratio to adapt to the corresponding sulfur dioxide increased load. The method implements high desulfurization efficiency under the single-tower single-circulation conditions. The desulfurization process is simple to operate and convenient to run, and lowers the cost.

The present invention discloses a determination method for a mixture comprising calcium carbonate, calcium sulfate, ammonium sulfate and the like, wherein the total calcium content, the total nitrogen content and the total sulfur content in the mixture are determined to represent concentration of the mixture. The method comprises: (1) determining the total calcium content, wherein a sample is titrated by using EDTA to determine the total calcium content; (2) adopting a Kjeldahl azotometer to carry out distillation, and carrying out titration to determine the total nitrogen content; and (3) treating the sample, then adopting a whole spectrum direct reading plasma emission spectrometer (ICP-OES) with a pre-calibrated working curve to determine sulfur content to obtain a concentration, calculating the total sulfur content, and respectively calculating ammonium sulfate content and calcium sulfate content according to a formula. With the method of the present invention, difficulties of determinations of CaCO3 content, CaSO4 content and (NH4)2SO4 content in a calcium carbonate filter cake of an ammonium sulfate preparation apparatus using phosphogypsum are overcome. In addition, the method of the present invention is suitable for enterprises adopting phosphogypsum as a raw material to produce ammonium sulfate.

The invention provides a comprehensive utilization method for converter slag. The converter slag, which comprises free calcium oxide in weight percent more than 3%, total calcium in weight percent of 23%-38% and total iron in weight percent of 8%-28%, is used in the method as the raw material. According to the method, sodium hydroxide, calcium citrate, iron oxide, magnesium sulfate and cement additive can be obtained through processing steps including pretreatment of the converter slag, citric acid dissolution reaction and filtration, hydrolysis reaction, sulfuric acid dissolution and filtration, iron precipitation reaction, iron oxide preparation and magnesium sulfate preparation. The method aims to utilize the converter slag discharged in large scale, so as to solve the environmental pollution problem and fully utilize iron and calcium resources in the converter slag.

The invention discloses a method for removing metal in high-acid heavy crude oil. The method is characterized by comprising the following steps of: fully mixing and emulsifying the crude oil, a demetallization agent, injected water and a demulsifying agent at the temperature of 30-150 DEG C so that the metal in the crude oil enters into water phase in a form of a water-soluble ionic compound, wherein the mole number of the demetallization agent is 1-4 times total calcium mole number in the crude oil, the weight of the injected water is 2-10% that of the crude oil, and the demulsifying agent is 5-70ppm relative to the crude oil; and finally removing the metal by means of oil-water separation, wherein the crude oil demetallization agent comprises the following ingredients in percentage by weight: 20-40% of a chelating agent, 20-40% of inorganic acid, 0.1-5% of a dispersing agent or a surface active agent, 0.5-3% of a corrosion inhibitor and 20-40% of injected water.

The invention discloses a calcium-rich Sedum aizoon production method. The method includes obtaining calcium tolerant seedlings through domestication in a Sedum aizoon cutting phase; selecting test fields, turning over the soil before applying the base fertilizer, transplanting the obtained Sedum aizoon, applying calcium fertilizer to the soil, and harvesting the Sedum aizoon after the Sedum aizoon is mature. By the use of the calcium-rich Sedum aizoon production method, the calcium content in the stems and leaves of the Sedum aizoon can be 1 to 5% and is 2 to 5 times of that of ordinary Sedum aizoon; the calcium pectate accounts for more than 55% of the total calcium. The calcium-rich Sedum aizoon produced by the method has the advantages of super high calcium content, high absorbability and high safety.

The process of eliminating metal from hydrocarbon oil with acrylic acid-acrylate copolymer includes mixing the acrylic acid-acrylate copolymer with water injecting demulsifier and raw oil at 30-200 deg.c to make metal in hydrocarbon oil generate water soluble compound dissolved in water, and oil-water separation to eliminate metal from hydrocarbon oil. The acrylic acid-acrylate copolymer has molecular weight of 1000-50000, and molar ratio between acrylic acid structure units and acrylate structure units of 0.1-20. The copolymer consumption is 0.5-5 times, preferably 1.0-3.0 times, the total calcium weight in hydrocarbon oil. The process has the features of less copolymer consumption and high elimination efficiency, and may be used for hydrocarbon oil in excessive calcium content.

The invention relates to an offshore oil and gas field gathering and transmission pipe descaling and descaling effect evaluation method, which comprises the following steps of: a, preparing a chemical tank; b, injecting neutral descaling agent in the chemical tank; c, detecting concentration of total calcium ions in water samples at the head end and the tail end of a gathering and transmission pipe by adopting an EDTA (ethylene diamine tetraacetic acid) titration method; d, starting up a chemical injection pump to pump the descaling agent into the head end of the gathering and transmission pipe; e, after the descaling agent is injected, periodically detecting the concentration of total calcium ions in the water samples at the head end and the tail end of the gathering and transmission pipe by continuously adopting the EDTA titration method; f, adjusting the input quantity of the descaling agent till the concentration of the total calcium ions in the water sample at the head end of the gathering and transmission pipe is obviously smaller than the concentration of the total calcium ions in the water sample at the tail end of the gathering and transmission pipe; g, conducting mechanical descaling by adopting a ball passing operation method; and h, when the concentration of the total calcium ions in the water sample at the head end of the gathering and transmission pipe is detected to be equal to the concentration of the total calcium ions in the water sample at the tail end of the gathering and transmission pipe, adjusting the concentration of the neutral descaling agent to a low value.

The invention discloses a microbial growth regulator for prawn culture and a preparation method thereof. The regulator is prepared from the following raw materials: prawn shell meal, soybean meal, peanut bran meal, cuttlefish paste (the water content is 30 to 50 percent), calcium dihydrogen phosphate, ferrous sulfate, copper glycine, zinc methionine, manganese glycine and papain with an activity unit of more than 0.5 million u. The regulator is formed by hydrolysis, polymerization and chelation reaction. The regulator contains the following active ingredients in percentage by weight: over 15 percent of protein, over 13 percent of total amino acid, over 0.83 percent of lysine, over 0.26 percent of methionine, over 2 percent of available phosphorus, over 2 percent of total calcium and over 1 percent of mineral element. The regulator used in a prawn culture water body can construct a complete food chain of the culture water body and effectively control the water quality of the water body; the regulator also can be used as a prawn feed additive and added in a low-temperature granulation process, and the regulator is an active ingredient of feed protein and is also prawn attractant; and the prepared feed used in the prawn culture has regulation effect on the water quality of the water body.

Nutritionally improved cultured dairy products such as yogurt products include a fine powdered calcium phosphate salt of reduced particle size having a mean diameter ≦6 μm in amounts sufficient to provide a total calcium content of 0.25% to 0.75%. A method for producing the calcium fortified yogurt is also provided wherein an fine powdered insoluble calcium salt is admixed with a milk blend prior to fermentation. The yogurt is prepared by conventional fermentation. Both stirred style and cup set style yogurt products can be prepared.

The application process of chemical side product containing organic acid includes well mixing hydrocarbon oil with chemical side product containing organic acid and water injecting demulsifier to make metal in hydrocarbon oil produce water soluble compound dissolved in water; and oil-water separating to eliminate metal from hydrocarbon oil. Meanwhile, the amount of the side product is 0.5-10 times total calcium molar number in hydrocarbon oil, the amount of water is 3-50 % of hydrocarbon oil volume, the oil-water mixing time is 0.5 sec to 10 min and the mixing temperature is 30-150 deg.c. The process of applying chemical side product directly in demetalizing hydrocarbon oil has low cost, simple operation and easy industrial application, can improve the quality of hydrocarbon oil obviously.

The invention provides a method for manufacturing calcium sulfide with gypsum, sulfur-fixing agent and high-sulfur coal, relating to the chemical production technical field. The method comprises the following steps of: a. evenly mixing the gypsum, the sulfur-fixing agent and the high-sulfur coal according to the requirements that the mol ratio of total metallic ions in the sulfur-fixing agent to sulfur in the high-sufur coal is 0.8 to 3.5, and the proportion of the total calcium molar weight in the mixture to the carbon molar weight in the coal meets 1 to between 2 and 4; b. sending the mixture into a high-temperature roasting device for roasting the mixture to acquire a calcium sulfide product. The method not only increases the yield of the calcium sulfide product, but also provides an effective using way for the high-sulfur coal, so that the cost of the calcium sulfide product can be greatly reduced. The manufacturing method can ensure that the percent reduction of reducing CaSO4 in phosphogypsum or other gypsum materials to CaS reaches over 87 percent, can manufacture high-content CaS products, and has the advantages of easily controlled manufacturing process and easy realization of high and stable yield.

The invention discloses a brine impurity removal method in a sodium chlorate production technology. When crude brine is taken as the raw material for producing sodium chlorate, the brine impurity removal method comprises three processes including chemical impurity removal, ion exchange and micro-filtration; and when brine or seawater is taken as the raw material for producing sodium chlorate, the brine impurity removal method comprises five processes including micro-filtration, reverse osmosis concentration, chemical impurity removal, ion exchange and micro-filtration. The content of total calcium and magnesium ion is reduced to lower than 0.5 mg / L in the brine processed by the brine impurity removal method, so that corrosion of an electrolysis bath anode can be relieved, the production power consumption can be reduced, the tank washing period can be prolonged, and the production efficiency can be improved.

The invention relates to the fields of food and food processing, in particular to calcium supplementing child steak and a preparation method thereof. The calcium supplementing child steak is prepared from the raw materials of beef sirloin, salt, white granulated sugar, phosphate, isolated protein, starch, edible calcium powder, spice, black pepper powder, monosodium glutamate, essence, glutamine transaminase and ice water and is prepared through the technologies of unfreezing, dividing, preparing feed liquid, injecting, rolling and kneading twice, filling, standing, quickly freezing and the like. By means of the technologies disclosed by the invention, microelement calcium can be evenly added into the child steak, the total calcium intake amount of a child can be accurately calculated and controlled through the steak intake amount of the child, and finally the purpose of supplementing calcium reasonably is achieved.

The invention discloses a microwave digestion pretreatment method for soil detection-total sodium potassium calcium content determination. The microwave digestion pretreatment method is used for determining the total sodium content, the total potassium content and the total calcium content in soil, a pretreated soil sample is placed into a polytetrafluoroethylene digestion tube, concentrated nitric acid, hydrofluoric acid and hydrogen peroxide are added into the digestion tube, and then microwave digestion is carried out; cooling is carried out after digestion, and an acid catching instrument is used for carrying out acid catching on a sample solution contained in the digestion tube; after acid catching is completed, nitric acid of 1-3% (v / v) is used for dissolving residues in the digestion tube and volume setting to obtain solution after soil pretreatment, and the total potassium content and the total calcium content of the solution are determined. The step of acid catching is added, measurement results are more accurate, damage to the experiment instrument due to overhigh acidity is avoided, the soil is digested more thoroughly, element content determination is higher in accuracy, and in addition compared with existing method of determining the total sodium potassium calcium content in the soil, the method is simpler and easier to implement.

In vitro full anticoagulation is a precondition for ensuring the smooth progress of a blood purification technique. Based on research at home and abroad, for high-risk bleeding patients with dialysis indications, no ideal anticoagulation method exists currently. In recent years, citrate anticoagulation shows certain superiority, has definite anticoagulation effect, and is insusceptible in system coagulation function. From local citrate anticoagulation to citrate anticoagulation replacement fluid or dialysate, uncertain amount of calcium supplementation and other deficiencies still exist. According to ionization equilibrium, coordination equilibrium, proton equilibrium, theory of coordination valence bond and law of changeless total calcium, an assumption about a calcium-containing citrate concentrated anticoagulant hemodialysis solution is proposed, namely, to add calcium or magnesium ions to a novel citrate concentrated anticoagulant hemodialysis solution, and no exogenous calcium supplementation is needed, so that a clinical citrate anticoagulation method is further simplified so as to be better in clinical application, and a novel anticoagulation thought or method for clinical high-risk bleeding patients is tentatively explored as well.

Disclosed are improved, intermediate moisture sweetened gelled food compositions fortified with calcium supplied by calcium phosphate that is dispersed in an oil and / or fat. The gelled compositions comprise: A) about 55 to 85% by weight nutritive carbohydrate sweeteners; B) sufficient amounts of a gelling agent(s) to provide a gel strength of about 2-8 kg / cm2; C) about 50 to 1500 mg / oz total calcium; and D) about 9 to 20% moisture, and E) about to 0.1% to 5% of an edible fatty triglyceride. Also disclosed are methods for the preparation of such fruit products involving forming a concentrated slurry of calcium phosphate having a particle size such that at least 90% are less than 150 μm dispersed in at least a portion of the oil and / or fat, forming a gellable blend and admixing the gellable composition with the slurry to form a gellable calcium fortified composition and forming into desired shaped and sized pieces.

The invention relates to a method and a system for recycling the regenerated waste liquid of a sodium bed. The method comprises the following steps: adding polymerization ferric chloride or polymeric ferric sulfate or a polymeric aluminum solution into waste liquid by virtue of waste liquid detection according to needed addition amount, then sequentially adding NaOH or lime, and then adding Na2CO3, so that divalent ions Ca<2+> and Mg<2+> in the waste liquid form an aggregate, and the aggregate is subjected to pressure filtration by virtue of a pressure filter and then is subjected to solid-liquid separation; and regulating the pH value of a separated pressure filter clear liquid, supplementing NaCl for the pressure filter clear liquid, and sequentially performing fine filtration by virtue of an immersion type ultra-filter to obtain the recyclable regenerated waste liquid of the sodium bed, wherein the total calcium-magnesium amount is smaller than 40mg / L, the SS is smaller than or equal to 0.1mg / L, and the turbidity is smaller than or equal to 0.1NTU. According to the method and the system, the divalent ions in the regenerated waste liquid of the sodium bed can be effectively removed, the continuity of the treatment process of waste salt water is realized, each treatment period is about 8 hours, the zero-emission and the continuous regeneration of the regenerated waste liquid of the sodium bed are realized, and the system is simple in structure, stable to operate and suitable for industrial application.

The invention provides high-calcium and selenium-rich foliage spraying fertilizer for fruit trees. The high-calcium and selenium-rich foliage spraying fertilizer for the fruit trees is prepared from water and main materials, wherein the main materials comprise sodium selenite, urea, sugar alcohol chelated calcium, fulvic acid, plant ash leachate, an organic fertilizer leachate and an agriculturalorganic silicon surfactant; the adding amount of the main materials in each 1kg of the water is as follows: 5 to 15mg of the sodium selenite, 3 to 5g of the urea, 3 to 5g of the sugar alcohol chelatedcalcium, 1 to 3g of the fulvic acid, 30 to 100ml of the plant ash leachate, 50 to 200ml of the organic fertilizer leachate and 1 to 3ml of the agricultural organic silicon surfactant. According to the high-calcium and selenium-rich foliage spraying fertilizer provided by the invention, the production of selenium-rich and high-calcium fruits is integrated and the total selenium content of the fruits in the fruit trees and the total calcium content of fruit pulp are greatly improved; the agricultural organic silicon surfactant is used as a diffusing agent, so that nutrient components includingcalcium, selenium, amino acids and the like have very good permeability and also have very good diffusing performance; furthermore, the amino acid chelated calcium is used as a calcium source, and fixation of the calcium is avoided; the mobility of the calcium is improved, and a total area of calcium supplementing and calcium absorption is greatly improved; the absorption and utilization rate of the calcium is extremely improved.

The invention discloses a compound nutritive high calcium salt used for fruit and vegetable pickling. The compound nutritive high calcium salt is mainly made from, by weight part, 970-1000 of salt, 0-30 parts of organic calcium, 0-30 parts of inorganic calcium, 0-30 parts of inorganic magnesium, 0-30 parts of a carbohydrate substance, and 0-30 parts of plant spice. The calcium ion content of compound nutritive high calcium salt is more than 600 mg / kg and less than 50000 mg / kg. The plant spice comprises, by weight part, 2 parts of hot peppers, 0.5 part of pricklyash peel, 0.5 part of ginger powder, and 0.5 part of liquorice roots. The invention further discloses a preparation method of the compound nutritive high calcium salt. Based on salt, through reasonable addition of one or more of organic calcium, inorganic calcium, inorganic magnesium, and a carbohydrate substance, the total calcium content of the salt is more than 600 mg / kg and less than 50000 mg / kg. The salt has a crisp improving and maintaining effect on fruit and vegetable pickling, improves the flavor and quality of fruits and vegetables, and is simple in manufacture process and high in efficiency.

The process of eliminating metal from hydrocarbon oil with acrylic acid-acrylate copolymer includes mixing the acrylic acid-acrylate copolymer with water injecting demulsifier and raw oil at 30-200 deg.c to make metal in hydrocarbon oil generate water soluble compound dissolved in water, and oil-water separation to eliminate metal from hydrocarbon oil. The acrylic acid-acrylate copolymer has molecular weight of 1000-50000, and molar ratio between acrylic acid structure units and acrylate structure units of 0.1-20. The copolymer consumption is 0.5-5 times, preferably 1.0-3.0 times, the total calcium weight in hydrocarbon oil. The process has the features of less copolymer consumption and high elimination efficiency, and may be used for hydrocarbon oil in excessive calcium content.

The invention relates to pedal motorcycle special-purpose long-life low-noise lubricating oil. The pedal motorcycle special-purpose long-life low-noise lubricating oil at least comprises 5.8%-7.8% of a gasoline-engine oil compound, 0.8% of an antioxidant, 1.1%-1.3% of an anti-wear friction reducer, 3.5%-4.5% of a viscosity index improver and 86.6%-87.8% of mixed base oil. The lubricating oil also comprises a compound anti-foaming agent. The gasoline-engine oil compound comprises an ashless dispersant and a total calcium-based detergent. The anti-wear friction-reducing agent is one or more of molybdenum dialkyldithiocarbamate, a molybdate and a molybdenum-amine complex. The viscosity index improver is ethylene-propylene copolymer liquid sol. Compared with the commercial oil, the lubricating oil needs longer time in consumption of the same amount of oxygen and has good oxidation resistance and abrasion resistance and a long service life. The pedal motorcycle using the lubricating oil has low noise and friction.