227results about How to "Improve pickling effect" patented technology

The invention discloses a method for regeneration of a spent denitration catalyst, and relates to a composition for a cleaning solution and an application thereof, and an activity recovering method for a spent SCR catalyst. The invention is used for solving the technical problems in the prior art that a lost catalyst active component in a regeneration process cannot be selectively supplemented and an iron rust defect of a metal module framework cannot be effectively eliminated. The method comprises the following steps: one, dust cleaning; two, spraying; three, cleaning; four, re-cleaning; five, acidification; six, pre-drying; and seven, activity supplementing. Cleaning media of sodium hydroxide and potassium hydroxide can dissolve inactivated V2O5 and toxic element arsenic on the surface of the catalyst. While the method can selectively supplement the catalyst active component (TiO2), the iron rust removal rate of the metal module framework reaches 19% to 24%. The invention belongs to the field of spent denitration catalyst regeneration.

The invention discloses a chemical stainless steel polishing solution which comprises the following components in content: 80mL/L to 120mL/L of 68% nitric acid, 50mL/L to 150mL/L of 40% hydrofluoric acid, 50mL/L to 120mL/L of 30% hydrogen peroxide, 50mL/L to 80mL/L of 85% phosphoric acid, 50mL/L to 80mL/L of 98% concentrated sulfuric acid, 10mL/L to 30mL/L of 95% ethanol, 5g/L to 15g/L of urea, 20g/L to 40g/L of a brightening agent, 0.5g/L to 2g/L of a fog inhibitor and 2g/L to 6g/L of a corrosion inhibitor. The chemical polishing solution is stable in polishing speed; a processed stainless steel workpiece is flat in surface, bright, free of dust, also stable in performance, capable of being stored for a long time and low in production cost; during polishing, irritant acidic gas is small in volatility.

The invention relates to a hydrochloric-acid acid washing liquid and an acid washing method for a 400-series stainless steel hot-rolled annealing wire. The acid washing liquid comprises hydrochloric acid, nitric acid, a corrosion inhibitor, a surface active agent, an accelerant, a solution stabilizer and water. The acid washing liquid comprises the substances at a mass ratio as follows: 8wt%-22wt% of hydrochloric acid, 0.01wt%-10wt% of nitric acid, 0.01wt%-1wt% of the corrosion inhibitor, 0.05wt%-1wt% of the surface active agent, 0.05wt%-1wt% of the accelerant, 0.05wt%-1wt% of the solution stabilizer and the balance of water. The acid washing method comprises steps as follows: the acid washing liquid is injected to an acid washing tank, the whole coil of the hot-rolled wire after annealing is directly placed in the acid washing tank for acid washing, the acid washing temperature is in a range from 45 DEG C to 85 DEG C, and the acid washing time is 0.5-2 h. The treated wire rod surface is clean, white and bright, oxide scale residues are avoided, the acid washing process is stable, the surface is slightly frosted and suitable for wire drawing, and a follow-up passivation process can be omitted.

A high-efficiency, energy-saving and environment-friendly pickling device for hydraulic pipe fittings, including a pickling tank with a raised middle and concave sides. The raised part in the middle of the pickling tank is provided with an acid-resistant bracket for placing the pickling pipe, and one side of the pickling tank is concave. There is a sediment frame in the tank, a steam heater is installed in the concave tank on the other side, a return pipe is provided between the concaves on both sides, and a float covering the pickling liquid surface is installed on the upper part of the pickling tank. There is a nozzle at one end of the pickling pipe, and the nozzle is fixed on the distributor. The distributor is connected to an acid-resistant pump through a quick joint, and is equipped with a device to control the on-off of the heater steam and the start-stop of the acid-resistant pump drive motor according to the temperature of the acid liquid. Electric control system. Utilizing the acid delivery pump to realize the circulating flow of the cleaning liquid effectively improves the uniformity of the acid concentration, and effectively improves the cleaning efficiency and cleaning quality; the structure is simple, the acid liquid can flow and circulate, the pickling efficiency is high, and the pickling effect is high. Good, energy saving and environmental protection.

The invention relates to an acid pickling device for a laboratory. The acid pickling device comprises a pickling bath, a fluoroplastic magnetic drive pump, an acid mist absorption cover, a suction fan, an acid mist collection vessel, a cover plate and a heating device inserted into the pickling bath, wherein the acid mist absorption cover is arranged above the pickling bath; a suction port and an air outlet of the suction fan are connected with a suction pipe and an air outlet pipe respectively; one end of the air suction pipe extends into the acid mist absorption cover to be communicated with the acid mist absorption cover; one end of the air outlet pipe is communicated with the acid mist collection vessel; an acid liquor draining hole and an acid liquor entering hole are symmetrically formed in two side walls of the pickling bath and connected with a suction port and a drain port of the fluoroplastic magnetic drive pump respectively through an acid liquor conveying pipe; an acid mist discharge port is further formed above one side wall of the pickling bath and is connected with an acid mist conveying pipe communicated with the acid mist collection vessel. The acid pickling device for the laboratory is compact in structure, high in acid pickling efficiency, good in energy saving and environmental protection property and suitable for acid pickling device in the laboratory, and cleaning acid liquor can flow circularly.

The invention discloses an environment-friendly steel wire pickling bath which comprises a water circulating device and an acid liquor circulating device. The pickling bath consists of a plurality of horizontally arranged pickling pipelines, and the pickling pipelines consist of PE (Polyethylene) pipes. A UHMV-PE (Ultra High Melt Viscosity-Polyethylene) layer is arranged on the inner wall of each pickling pipeline, acid adding pipes are uniformly connected at intervals on the top faces of the pickling pipelines, and the acid adding pipes are communicated with the acid liquor circulating device. Both ends of each pickling pipeline are respectively connected with a liquor collecting tank, a steel wire drawing device is arranged in the liquor collecting tank, and a steel wires pass through the pickling pipelines and the steel wire drawing devices in the two liquor collecting tanks. An acid return tank and a water return tank are also arranged in the liquor collecting tank, the acid return tank is communicated with both ends of the pickling pipeline, and the bottom face of the acid return tank is connected with the acid liquor circulating device through an acid return pipe. A water spray device for spraying water to the surfaces of the steel wires is arranged above the water return tank, the water spray device is connected with the water circulating device through a water inlet pipe, and the bottom face of the water return tank is connected with the water circulating device through a water return pipe. The top faces of the two liquor collecting tanks are respectively connected with air exhaust pipes.

The steel wire material for spring in accordance with the present invention comprises, on the percent by mass basis, C: 0.35 to 0.7%, Si: 1.4-2.5%, Mn: 0.05-1.0%, Cr: 0.5-1.9%, P: less than 0.02% (not including 0%), and S: less than 0.02% (not including 0%), wherein the concentration difference of Cr between on the surface and in the steel is less than 2.50%. Plenty of steel wire materials containing Si and Cr have excellent acid rinsing property even without additional alloy components containing necessary component such as Mo and the like.

The invention discloses a regeneration process for waste lubricating oil. The process mainly comprises the procedures of deposition, distillation, pickling, adsorption with white clay and filtering and is characterized in that 2 to 4 parts by weight of No. 120 solvent naphtha is added into every 100 parts by weight of waste lubricating oil before pickling so as to realize dilution, then the procedures of pickling and adsorption with white clay are carried out and underpressure distillation is simultaneously carried out as adsorption with white clay is carried out so as to remove the No. 120 solvent naphtha through distillation. According to the invention, a diluent is added into waste lubricating oil for dilution to reduce viscosity of lubricating oil, which enables refining temperature to drop to an appropriate range, usage amount of sulfuric acid to be effectively reduced, pickling effects to be improved, usage amount of white clay to be reduced at the same time, regeneration cost to be substantially decreased and refining quality to be enhanced; and the diluent can be recycled, thereby effectively saving resources and further reducing pollution to the environment.

The invention relates to an acid pickling method belonging to the field of steel plate acid pickling methods. The acid pickling method comprises the step of uncoiling a steel plate and is characterized by also comprising the following steps of: (1) scale breading; (2) primary acid pickling; (3) spray acid pickling; (4) neutralizing; and (5) drying. When the method is used, a metal sheet enters an acid pickling machine through a feeding device, and the spray acid pickling of an acid spray nozzle is additionally provided on the basis of the original acid pickling, so that the acid pickling effect is improved. The acid spray nozzle is communicated with an acid pickling tank, an acid liquid in the acid pickling tank can be returned to the acid pickling tank, so that the utilization efficiency can be increased, the acid pickling cost can be reduced, and the acid pickling quality can be improved. Through optimized design, the acid pickling method is good in acid pickling effect, capable of reducing acid pickling cost and increasing the production efficiency of the acid pickling machine.

The invention relates to a processing technology for a steel tube, particularly relates to a processing technology for a corrosion-resistant stainless steel seamless steel tube, and belongs to the technical field of tube processing. The processing technology for the corrosion-resistant stainless steel seamless steel tube comprises the following steps: (1) tube blank smelting, (2) tube blank forging, (3) machining of a pierced billet, and (4) steel tube deforming. A tube blank is subjected to repeated chambering and cold rolling treatment, and is processed by a multi-pass small deformation; andaccording to the final cold drawing procedure, processing of the seamless steel tube is finished by cold drawing, oil removal, annealing, straightening, fixed cutting, acid pickling and inspection toobtain the product. In a cold rolling process, the processing deformation of the seamless steel tube does not exceed 55%; in a chamfering process, the processing deformation of the seamless steel tube does not exceed 10%; in a cold drawing process, the processing deformation of the seamless steel tube does not exceed 15%; and an annealing process in the chamfering, cold rolling and cold drawing processes meets the conditions of solution annealing at the temperature of 1,052-1,093 DEG C and rapid cooling or water cooling.

The invention relates to a chemical pickling solution for removing surface oxide layers of high-temperature alloys containing elements Cr and Al and application of the chemical pickling solution and belongs to the process field of removal of oxide layers of high-temperature alloys by using a chemical method. The pickling solution is prepared from the following components: 300-400g/L of hydrochloric acid, 400-450g/L of nitric acid and 100-150g/L of hydrogen peroxide and the balance of water. Aiming at the high-temperature alloy work-pieces of which the nickel base, iron base and cobalt base contain Cr and Al, the surface oxide layers are removed through the synergism of hydrochloric acid, nitric acid and hydrogen peroxide in specific concentration, the action mechanisms of above components are as follows: hydrochloric acid and nitric acid are used as base reactants to react with the surface oxide of a high-temperature alloy, and the hydrogen peroxide is used as a catalyst to accelerate the generation of the reaction. The chemical pickling solution provided by the invention is obvious in pickling effect and high in efficiency, the treated high-temperature alloy has a bright and uniform surface; the pickling solution is low in heat release in the matching process, no inflammable, sensitizing and explosive reactant is generated, and the security is high.

The invention discloses stainless steel acid pickling passivation paste and a preparing method thereof. The stainless steel acid pickling passivation paste comprises the ingredients including nitrous acid, phosphoric acid, oxalic acid, alkyl alcohol polyoxyethylene ether, sodium citrate, acetic anhydride, potassium pyrophosphate, disodium hydrogen phosphate, benzotriazole, glycerol, gel, a corrosion inhibitor, a penetrating agent, a thickening agent, a viscosity modifier and an inorganic filler. Parts of raw materials like the acetic anhydride are firstly added into the phosphoric acid to be mixed to obtain mixed liquor I; then parts of raw materials like glycerol are sequentially added into mixed acid liquor of the nitrous acid and the oxalic acid to be mixed to obtain mixed liquor II; the mixed liquor I and the mixed liquor II are mixed, and the inorganic filler is added into a mixture; and finally the penetrating agent, the corrosion inhibitor, the thickening agent, the viscosity modifier and the gel are sequentially added while stirring is carried out, and the finished product is obtained after even stirring is carried out. The stainless steel acid pickling passivation paste is good in passivation effect, damage to the stainless steel surface is not prone to occurrence, the stainless steel acid pickling passivation paste is environment-friendly and simple in preparation, and harms on human bodies and damage to the environment can be avoided.

The invention discloses a pre-pickling acid liquor circulation system and a pre-pickling acid liquor circulation method for hot-rolled stainless steel strip steel. The system comprises an acid mixing pickling circulation tank, a sulfuric acid pickling circulation tank, a heat exchange device, and a pickling bath; an outlet of the acid mixing pickling circulation tank and an outlet of the sulfuric acid pickling circulation tank are connected with a liquor inlet of an acid liquor circulation pump; a liquor discharge port of the acid liquor circulation pump is connected with an inlet of the heat exchange device; an outlet of the heat exchange device is connected with an inlet of the acid mixing pickling circulation tank, an inlet of the sulfuric acid pickling circulation tank, and an acid inlet of the pickling bath; and an acid discharge port of the pickling bath is connected with the inlet of the acid mixing pickling circulation tank and the inlet of the sulfuric acid pickling circulation tank. The circulation system is simple and practical; and by the circulation system, investment cost is reduced, the pickling parameters can be controlled continuously, the forming amount of sludge in a solution can be reduced, and the pickling effect can be improved.

The invention discloses a method for enhancing the acid pickling efficiency of stainless steel tubes. The method comprises the following steps of (1) acid pickling tank equipment modification, wherein the bottom of each acid pickling tank is arranged to be in an arc shape, and movable supporting devices are adopted on the two sides of an acid tank; and (2) an acid pickling process, wherein the procedures of carrying out feeding and acidification in sequence and carrying out acid discharge and uncovering in sequence are adopted, the acid mist discharge amount is greatly reduced, movement of the two ends of a crown block track is controlled in the acid pickling process, the two ends alternately move up and down, the process is repeated, acid liquor is disturbed by the steel tubes to form a turbulent flow state, the flow of an acid liquor circulation system is increased, the turbulent flow effect is enhanced, sludge accumulation in the acid tank is reduced, the acid liquor is cyclically heated through a heat exchanger, the temperature is automatically controlled, and the acid pickling efficiency is improved. According to the method, the acid pickling effect of the steel tubes is enhanced; the acid pickling efficiency is improved; and by means of an empty tank feeding and automatic acid discharge system, the acid mist discharge amount is greatly reduced, and environment benefits are enhanced.

The invention relates to a beryllium bronze oxidation film cleaning agent and a preparation method thereof, belonging to the technical field of metal surface chemical treatment. The beryllium bronze oxidation film cleaning agent comprises the following components in terms of weight percent: 20-50% of sulfuric acid, 2-20% of nitrate ions, 2-10% of organic phosphonic acid, 0.01-1% of halogen ions and the balance of water. The preparation method is as follows: (1) preparing the components according to the weight percents; and (2) slowly adding the sulfuric acid into the organic phosphonic acid with the formula amount, fully stirring the mixture, cooling the mixture to the room temperature, then adding nitric acid, fully stirring the mixture, adding the halogen ions, and finally obtaining theberyllium bronze oxidation film cleaning agent. The beryllium bronze oxidation film cleaning agent adopts the complex system of the organic phosphonic acid, the sulfuric acid, the nitrate ions and thehalogen ions to solve the problem of difficult beryllium bronze oxidation film removal and to simultaneously replace a conventional hexavalent chromium pickling system; and the beryllium bronze oxidation film cleaning agent reduces the pollution and improves the pickling effect. After cleaned by the cleaning agent, a beryllium bronze surface is flat and bright, therefore the performance and the appearance of a beryllium bronze product are improved.

The invention specifically relates to a silicon steel pickling promoter and a preparation method thereof. According to a technical scheme in the invention, the silicon steel pickling promoter is prepared from 0.1 to 5.0 wt% of a corrosion inhibitor, 10.0 to 50.0 wt% of an inorganic salt reducing agent, 0.1 to 5.0 wt% of an emulsifier, 5.0 to 20.0 wt% of an organic metal ion chelating agent, 0.1 to 5.0 wt% of a defoaming agent, 0.1 to 5.0 wt% of a synergist and 20.0 to 80.0 wt% of water through uniform mixing at normal temperature with stirring. The silicon steel pickling promoter provided by the invention has the characteristics of convenience in usage, high pickling efficiency, low cost, environment friendliness, a good corrosion inhibition effect, etc.

The invention relates to a stainless steel hot rolling strip steel acid pickling process. The process comprises the steps of scale breaking unit scale removal pretreatment, wherein the total extensionrate of strip steel is controlled to be larger than or equal to 3.0%; first-segment hydrochloric acid acid pickling, wherein the strip steel is immersed in first-segment hydrochloric acid acid pickling liquid to be subjected to first-segment hydrochloric acid acid pickling, the hydrochloric acid concentration of the first-segment hydrochloric acid acid pickling liquid is controlled to 50 to 300 g/L, the iron ion concentration is controlled to 5 to 100 g/L, the temperature is controlled to 60 to 80 DEG C, and the acid pickling time is controlled to 25 s to 50 s; second-segment hydrochloric acid acid pickling, wherein the strip steel is immersed in second-segment hydrochloric acid acid pickling liquid to be subjected to second-segment hydrochloric acid acid pickling, the hydrochloric acid concentration of the second-segment hydrochloric acid acid pickling liquid is controlled to 50 to 250 g/L, the iron ion concentration is controlled to 5 to 100 g/L, the temperature is controlled to 50to 75 DEG C, and the acid pickling time is controlled to 25 s to 50 s; grinding scrubbing, wherein the strip steel is subjected to grinding scrubbing, the diameter of roller brush bristles is controlled to 0.7 to 1 mm, the bristles contain silicon carbide abrasives with meshes being 170 to 200 meshes, the rotating speed of a roller brush motor is controlled to 600 to 1000 rpm, and the current of the roller brush motor is controlled to 100 to 200 A.

A heating apparatus for a pickling tank comprises a heating box, acid-proof heating pipes and a PLC controller; the heating box is provided with a water inlet and a water outlet, and the water outlet is disposed below the water inlet; the water inelt is connected with a water pump; the water outlet is provided with a water outlet pipe; the top of the heating box is provided with a plurality of installation holes; the acid-proof heating pipes are fixedly disposed on the installation holes in an insertion manner and is vertically arranged in the heating box; each acid-proof heating pipe comprises a pipe body prepared from polytetrafluoroethylene material, and the pipe body is inside provided with a drawing-out rod and a resistance wire; a liquid-level sensor and a temperature sensor are arranged on the heating box; the liquid-level sensor is arranged at a same horizontal plane with the connection point of the drawing-out rod and the resistance wire; and the liquid-level sensor, the temperature sensor, the acid-proof heating pipes, the water pump and the PLC controller are in electrical connection. The heating apparatus is simple in structure and convenient to operate, helps to substantially improve the heating efficiency, enable a pickling solution to heated uniformly and increase the pickling effect.