66 results about "Potassium isocyanate" patented technology

The invention discloses a low-temperature surface nitriding method of a titanium alloy, and belongs to the technical field of metal surface heat treatment and modification. The low-temperature surface nitriding method is characterized by comprising the following steps of: firstly, carrying out sand blasting cleaning on the surface of the titanium alloy, then carrying out chemical mechanical lapping and polishing, then mixing powder crystal sodium cyanate (NaCNO) and granular crystal potassium cyanate (KCNO) and rare earth CeO2 powder in a certain proportion so as to obtain a nitriding reagent, placing the nitriding reagent and the treated titanium alloy in a crucible for compacting and sealing, then drying, and placing the crucible in a high-temperature furnace for heating, wherein NaCNO and KCNO are used as nitriding sources, and rare earth CeO2 is used as a catalyst. According to the low-temperature surface nitriding method, a TiN 0.3-1 nitriding layer is formed on the surface of the titanium alloy TC21, the friction coefficient of the surface of the titanium alloy is remarkably reduced, the surface hardness is increased, and the surface property is enhanced.

The invention discloses a modified lime sulphur and an application thereof in a gold leaching technology. The modified lime sulphur comprises a stabilizer sodium-hexametaphosphate, oxidants-calcium peroxide and potassium cyanate, and additives-lead nitrate and soluble bromides (such as sodium bromide, potassium bromide, calcium bromide and the like). The modified lime sulphur is used as a gold leaching agent so as to effectively recover gold from gold-containing ores, gold concentrate powder and gold-containing wastes. The modified lime sulphur has the characteristics that the modified lime sulphur is easy to synthesize; the preparation cost is low; the preparation process is environment-friendly and toxic-free; and when the prepared modified lime sulphur is used for gold leaching, the gold leaching technology is simple, and the gold leaching velocity is high; and moreover, the modified lime sulphur is suitable for more ores than cyaniding gold leaching.

The invention relates to a method for synthesizing Sulfentrazone. The method is characterized by comprising the steps of liberating o-chlorophenylhydrazine from o-chlorophenylhydrazine hydrochloride, which serves as a raw material, by an alkali, subjecting o-chlorophenylhydrazine to a reaction with trimethyl orthoacetate and potassium cyanate so as to obtain 1-o-chlorophenyl-3-methyl-1H-1,2,4-triazol-5-one, and then, subjecting 1-o-chlorophenyl-3-methyl-1H-1,2,4-triazol-5-one to N-alkylation, chlorination, nitration, reduction and sulfonylation, thereby obtaining the Sulfentrazone, wherein a composite catalyst and a solvent, i.e., dichloroethane are adopted in a chlorination reaction. The method for synthesizing the Sulfentrazone, disclosed by the invention, has the advantages that the o-chlorophenylhydrazine hydrochloride serves as the raw material, so that the steric hindrance of an intermediate product can be low, and the yield of the product is increased; and meanwhile, in the chlorination reaction, the composite catalyst is adopted, thus, the orientation effect on all atoms is good, and the solvent is dichloroethane, so that the recycling of the solvent is facilitated.

A method for diffusing titanium and nitride into a base material having a coating thereon using conventional surface treatments or coatings. The method generally includes the steps of providing a base material having a coating thereon; providing a salt bath which includes sodium dioxide and a salt selected from the group consisting of sodium cyanate and potassium cyanate; dispersing metallic titanium formed by electrolysis of a titanium compound in the bath; heating the salt bath to a temperature ranging from about 430° C. to about 670° C.; and soaking the base material in the salt bath for a time of from about 10 minutes to about 24 hours. In accordance with another aspect of the present invention, titanium and nitride may be diffused into a base material without a coating. The treated base material may further be treated with conventional surface treatments or coatings.

The invention relates to a salt bath formula for treating a stainless air conditioning compressor blade by salt bath nitriding treatment and a treatment method. The salt bath formula comprises the following compositions in percentage by weight: 5-20 percent of potassium cyanate, 15-25 percent of sodium cyanate, 3-10 percent of lithium carbonate, 8-25 percent of sodium carbonate, 10-30 percent of potassium carbonate, 1-3 percent of sodium hydroxide, 1-5 percent of potassium hydroxide and 1-15 percent of sodium chloride or sodium fluoride. The invention has the advantages that because Li ions and Cl ions are added in the formula, a melting point of salt bath is lowered, and nitridation can be carried out under lower temperature; the activity is favorable, and good appearance and good diffusion layer thickness can be achieved without introducing ammonia; and air cooling can be adopted after salt bath nitridation without adopting the traditional oil cooling mode.

The invention provides a preparation method of a cobaltosic oxide nano cage and the application of the cobaltosic oxide nano cage prepared by adopting the method in a lithium ion battery. The corresponding method comprises the steps that a predetermined amount of cobalt potassium cyanate and polyvinylpyrrolidone are dissolved in distilled water, and a cobalt potassium cyanate and polyvinylpyrrolidone solution is obtained; a cobaltous acetate solution is dropwise added to the cobalt potassium cyanate and polyvinylpyrrolidone solution, is magnetically stirred and then stands still for predetermined time, and then cobalt cyanate cobalt is obtained through centrifugal separation; the dried cobalt cyanate cobalt is calcined in air respectively at the calcination temperatures of 400 DEG C, 450 DEG C and 550 DEG C, and the cobaltosic oxide nano cage is obtained after the calcination; the dried cobalt cyanate cobalt is calcined in air for predetermined time at a calcination temperature of 650 DEG C, and a mixture of the cobaltosic oxide nano cage and cobaltosic oxide solid nanoparticles is obtained after the calcination. According to the preparation method, high temperature and high pressure are not needed, the manufacturing process is relatively simple, the requirement for equipment is not high, an operator only needs to use conventional equipment, and large-scale production can be realized.

The present invention relates to a salt bath formula and treatment method in the salt bath nitriding treatment of stainless steel air-conditioning compressor blades. The salt bath formula of the present invention is composed of the following components and proportioned by weight percentage: potassium cyanate and cyanic acid 25%-50% of sodium, 8%-25% of sodium carbonate, 10%-30% of potassium carbonate, 20%-40% of sodium chloride or potassium chloride; The process makes the passivation film on the surface of the blade removed by pickling, which is easy to infiltrate nitrogen during salt bath nitriding; because the concentration of Cl (7-17%) is increased in the formula, the melting point in the salt bath is reduced, and the formula does not contain Li And K2S can still be nitrided at lower temperature.

The invention discloses a method for cleanly producing high-purity cyanate at a low temperature, which comprises the following steps of: mixing urea and carbonate for 10-20 min for standby; adding cyanate bottom materials into a reactor, adding a mixture of the urea and the carbonate after the cyanate bottom materials are preheated to 140-150 DEG C; completely reacting the urea and the carbonate at a temperature of 160-180 DEG C; and obtaining a cyanate product after reacted materials are crushed. The invention also can adopt a continuous production manner. In the invention, potassium cyanate (sodium cyanate) is adopted as bottom materials so as to improve the dispersion of the reacted materials, more completely react the reacted materials, improve the product purity and generate no pollution; the reaction is conducted under the closed low-temperature environment so as to generate no toxic byproducts and greatly improve the safety; and the produced gas almost can be completely recovered without three-waste pollution. The high-purity cyanate has remarkable economic benefit and social benefit.

A method for diffusing titanium and nitride into a base material having a coating thereon using conventional surface treatments or coatings. The method generally includes the steps of providing a base material having a coating thereon; providing a salt bath which includes sodium dioxide and a salt selected from the group consisting of sodium cyanate and potassium cyanate; dispersing metallic titanium formed by electrolysis of a titanium compound in the bath; heating the salt bath to a temperature ranging from about 430° C. to about 670° C.; and soaking the base material in the salt bath for a time of from about 10 minutes to about 24 hours. In accordance with another aspect of the present invention, titanium and nitride may be diffused into a base material without a coating. The treated base material may further be treated with conventional surface treatments or coatings.

The invention belongs to the field of organic matter synthetic methods, and specifically relates to a synthetic method of an omega-substituted biuret compound. The synthetic method comprises the following steps: (1) condensation: adding substituted arylamine and potassium cyanate into a mixed solution of water and acetonitrile, warming, dropwise adding a part of acetic acid at the temperature of 45 to 100 DEG C, then adding remaining acetic acid 1 h later, and then reacting for 6 to 12 h; and (2) aftertreatment: carrying out recrystallization or column chromatography on an obtained product toobtain the omega-substituted biuret compound. The synthetic method overcomes the disadvantage that a nitrogen nitryl compound with dangerousness needs to be used in an existing synthetic process, anda one-pot method is adopted for replacing an existing two-step reaction with low yield.

The invention discloses a method for cleanly producing high-purity cyanate at a low temperature, which comprises the following steps of: mixing urea and carbonate for 10-20 min for standby; adding cyanate bottom materials into a reactor, adding a mixture of the urea and the carbonate after the cyanate bottom materials are preheated to 140-150 DEG C; completely reacting the urea and the carbonate at a temperature of 160-180 DEG C; and obtaining a cyanate product after reacted materials are crushed. The invention also can adopt a continuous production manner. In the invention, potassium cyanate(sodium cyanate) is adopted as bottom materials so as to improve the dispersion of the reacted materials, more completely react the reacted materials, improve the product purity and generate no pollution; the reaction is conducted under the closed low-temperature environment so as to generate no toxic byproducts and greatly improve the safety; and the produced gas almost can be completely recovered without three-waste pollution. The high-purity cyanate has remarkable economic benefit and social benefit.