39results about How to "Less acid mist" patented technology

The invention belongs to the stainless steel casting cleaning field, and relates to a passivating pickling solution obtained through adding an organic substance to an HNO3-HF base acid solution and compounding. The pickling solution comprises 3.3-37.5mass% of HNO3, 0.7-7.5mass% of HF, 1.3-13.5mass% of the compounded passivating agent, and the balance water. A polluted stainless steel casting is cleaned by the pickling solution to recover the metal luster originally possessed by the casting. The pickling solution forms a compact passivating film on the surface of the casting, so bright beauty maintenance and no rusty spot are realized after the casting is stored for a long term. The pickling solution has the characteristics of very small acid mist, benefiting for the environmental protection and the body health of an operation personnel, large pickling amount, and low pickling cost.

The invention relates to a technology for preparing sulfuric acid, in particular to a technology for preparing sulfuric acid by taking low-quality sulfur and a waste salt liquid containing sulfur that are generated by a coke oven gas wet oxidation desulfurization technology which takes ammonia as an alkali source and takes quinone, cobalt and ferrum compositions such as HPF as catalysts as raw materials, and through processes of incineration, waste heat recovery, wet purification, wet contact method conversion, and condensation into acid. The technology thoroughly solves the problem of treatment of a waste desulfurization liquid and low-quality sulfur that are generated by the coke oven gas wet oxidation desulfurization technology which takes the quinone, cobalt and ferrum compositions such as HPF, PDS and ZL as the catalysts, so that the desulfurization technology is completed; produced sulfuric acid can serve as a raw material for deamination of coal gas of a factory, and for production of ammonium sulfate, can be exported as sulfuric acid goods; and double purposes of resource recycle and environmental protection are achieved.

The invention discloses an inner forming process of a tubular lead-acid storage battery, which comprises the following steps of: (1) assembling positive and negative raw polar plates into a battery shell, filling 1.23-1.25g / cm<3> of sulfuric acid solution and standing for an hour so that the polar plates are fully soaked in the acid liquor; and (2) dividing the whole inner forming process into three phases, wherein different charging and discharging currents and time are adopted in different phases. The inner forming process lasts for four days, thereby shortening the production period, omitting the cockamamie sections, such as discharge, water washing, drying, and the like after formation and saving the production cost. Meanwhile, the polar plates are formed in the battery shell in the production process, and therefore, the acid mist is less, the pollution is low, and the body damage to workers is less than that of outer formation.

The invention provides a novel steel pipe rust remover and a preparation method thereof, and relates to the technical field of metal surface conditioning agents. The rust remover comprises 18-23wt% of hydrochloric acid, 8-13wt% of oxalic acid, 1.8-2.3wt% of a corrosion inhibitor, 1.8-2.3wt% of EDTA, 1.8-2.3wt% of citric acid, 0.25-0.35wt% of an osmotic agent JFC, and the balance of water. The corrosion inhibitor is prepared by compounding urotropine, rosinyl imidazoline ammonium salt and industrial alcohol according to a weight ratio of 3:0.8:5. The novel steel pipe rust remover provided by the invention generates obviously less acid mist than simple acid solutions for rust removal in the prior art in the use process, and the replacement frequency of the rust remover is only 1 / 3 of that of the acid solutions under a same use frequency, so the acid waste is greatly reduced; and almost no steel pipe over-etching conditions appear in the production process, so the production cost of steel pipe enterprises is greatly reduced.

The invention discloses the field of carbon steel surface pickling and stainless steel pickling passivation, and provides a steel pickling and water recycling method. The method solves the problems that in the production process, a large amount of acid mist is generated, the workpiece rising water treatment difficulty is large, during achieving, water recycling investment and running cost are high, and waste acid recycling is difficult. The steel pickling and water recycling method can be used for acid pickling of carbon steel and also can be used for stainless steel pickling passivation, waste acid recycling is achieved whole rinsing water is circularly used with low cost, and on the basis of ensuring production efficiency and product quality, the environment risk is greatly reduced.

The invention discloses a metal rust remover and a preparation method thereof, and aims to provide the rust remover which is capable of removing rusts on the surface of a metal and is simple in preparation method. According to the technical scheme, 1L of metal rust remover contains the following components: 150g to 250g of acid, 120g to 200g of oxalic acid, 100g to 150g of carbonate, 20g to 50g of fatty alcohol-polyoxyethylene ether, 3g to 7g of alkylphenol ethoxylates, 5g to 10g of thiourea, 20g to 40g of ethylene diamine tetraacetic acid, 10g to 20g of urotropin and the balance of water. The preparation method comprises the following steps: 1) weighing the components; 2) putting the components weighed by the step 1) in a flask, adding water to reach 1L and then stirring at a room temperature for 5 to 10 minutes so as to obtain the metal rust remover. The metal rust remover belongs to the technical field of metal cleaning.

The invention discloses a wet detoxification and bioremediation combined method for chromium slag and chromium-contaminated soil, wherein the method comprises the steps: pretreating waste slag containing hexavalent chromium or chromium-contaminated soil, removing large-particle materials, and conveying to a slurry stirring tank to obtain chromium-containing slurry; conveying the slurry to a wet detoxification acidification reduction tank, adding concentrated sulfuric acid, organic acid, hydroxy carboxylate and ferrous sulfate, carrying out acidification reduction reaction, dissolving out hexavalent chromium, and reducing hexavalent chromium into trivalent chromium; and then enabling the slurry to enter a reduction and stabilization tank, adding a reduction and stabilization agent for further reduction and stabilization reaction, and fully reacting hexavalent chromium to generate a stable trivalent chromium complex; then carrying out solid-liquid separation on the slurry, wherein filtrate flows into a wet detoxification reaction tank for recycling; and further carrying out biological reduction stabilizing treatment on dewatered cement cake, so as to ensure the long-term stability of the treated material.

The invention discloses a method for extracting lithium carbonate from salt lake brine with high magnesium / lithium ratio, belonging to the technical filed of inorganic salt extraction. The method comprises the following steps of: carrying out extraction, washing and stripping steps to obtain a stripping solution composed of NaCl and LiCl or NH4Cl and LiCl, then introducing CO2 or adding Na2CO3, and controlling the pH value and dynamic conditions to obtain a nanoscale or microscale Li2CO3 product. The method disclosed by the invention has the advantages of simple steps, low equipment requirement and wide sources of raw materials, and is suitable for industrial production.

The invention discloses a blackboard panel production system, which comprises a cleaning device, an air-drying device and a spraying device arranged in sequence; the cleaning device sprays acid liquid and also sprinkles sand on the steel plate surface; the air-drying device is provided with a scraping curtain and a scraper; the roller set of the spraying device includes ordinary rollers and magnetic rollers arranged at intervals, and a baffle is provided at the spray head; the post-processing device is covered by a cooling plate and contacts the steel plate for heat conduction, and at the same time uses a fan to dissipate heat. The invention has the problems of various cleaning methods, good air-drying effect and spraying effect, and high cooling efficiency.

The invention provides a preparation method and using method of a rust remover for electromechanical equipment. The preparation method comprises the following steps of: mixing a condensation compound of alkyl phenol and epoxyethane with a weakly alkaline sodium salt, thiourea, sulfamic acid and organic weak acid, and stirring after adding water so as to fully dissolve all the components in the water. The using method comprises the following steps of: cleaning the electromechanical equipment by using gasoline or acetone so as to remove oil, immersing the cleaned electromechanical equipment without oil into the prepared dust remover solution for 20-40 minutes at a normal temperature, washing the electromechanical equipment by using running water for 4-8 minutes immediately after taking out the electromechanical equipment from the dust remover solution, then immersing the electromechanical equipment into a sodium carbonate aqueous solution for 10-25 minutes, taking out the electromechanical equipment, washing the electromechanical equipment by using running water and wiping the electromechanical equipment dry. The rust remover is simple in the preparation technology and has no influence on the surface of the electromechanical equipment; the surface of the electromechanical equipment is relatively bright after rust on the surface of the electromechanical equipment is removed by using the rust remover; the rust remover has a good rust removal effect, is low in cost, can be used at a normal temperature, is less likely to generate acid mist, is harmless to human bodies and environmentally-friendly, and does not damage the surface of the electromechanical equipment; and the preparation method and using method of the rust remover are simple in operation.

The invention provides a rust remover and a preparation method of the rust remover, and relates to the technical field of metal surface treatment agents. The rust remover comprises, by weight percent, 2.5% of hydrofluoric acid, 17% of hydrochloric acid, 7.5% of oxalic acid, 3% of a corrosion inhibitor, 2% of diaminoethane quadrol, 0.6% of ethylene oxide and high-level fatty alcohol condensation compound and the balance water. The corrosion inhibitor is formed by compounding naphthamine, imidazolidinyl urea and rosin imidazoline ammonium salt according to the weight ratio being 3:0.4:0.9. In the using process of the rust remover, compared with pure acid liquor rust removal in the prior art, the acid mist generated by the rust remover is obviously reduced; and on the premise that the use frequency is equal, the replacement frequency of the rust remover is only half that of the prior art, the waste of acid is reduced to the greatest extent, the production process is more environment-friendly, and the production cost of steel pipe enterprises is greatly reduced.

The invention belongs to the field of cleaning stainless steel castings, and relates to a pickling solution with passivation effect obtained by adding organic substances to HNO3 and HF basic acid solution. It is composed of nitric acid and hydrofluoric acid, compound passivating agent and water, and its mass content is respectively: 3.3%~37.5% for nitric acid, 0.7%~7.5% for hydrofluoric acid, and 1.3~13.5% for compound passivating agent , Water is the balance. Clean the polluted stainless steel castings to restore the metallic luster of the castings. And a dense passivation film is formed on the surface of the casting, so that the casting can still keep silver bright and beautiful without rust spots after long-term storage. Another feature of the present invention is that the acid mist is very small, which is beneficial to environmental protection and the health of operators, the pickling amount is large, and the acid treatment cost is low.

The invention discloses a liquid barium / zinc heat stabilizer. The liquid barium / zinc heat stabilizer comprises the following preparation raw materials in parts by weight: 20-30 parts of barium oxide and / or barium hydroxide, zinc oxide and / or Or 15-20 parts of zinc hydroxide, 30-40 parts of acid solution, 1-2 parts of water-carrying agent, 5-20 parts of saturated naphthenic solvent and 5-15 parts of heat-resistant additive, and the hydroxide of barium is anhydrous At least one of barium hydroxide, barium hydroxide monohydrate and barium hydroxide octahydrate. The invention also discloses a preparation method of the liquid barium / zinc heat stabilizer and equipment for implementing the method. The performance of the liquid barium / zinc heat stabilizer of the present invention is stable, the product has no pungent smell, and will not cause harm to the health of operators; the preparation method of the liquid barium / zinc heat stabilizer of the present invention adopts a one-step method, which simplifies production The technology reduces the unsafe factors in the production process and improves the production efficiency and output rate.

The invention discloses a compound hydrochloric acid pickling corrosion inhibitor. The corrosion inhibitor is characterized by taking cucurbit[5]uril, cucurbit[6]uril, cucurbit[7]uril or cucurbit[8]uril as a main agent, being formed by compounding the main agent with one or more of triton, polyethylene glycol, cinnamaldehyde, 4-N,N-dimethylamino cinnamaldehyde, 3-(4-pyridyl)-acraldehyde, and being balanced with water.

The invention relates to a process for purifying gold by the wet method. Firstly, aqua fortis is used to remove silver; secondly, nitric acid is used to remove impurities such as bismuth and copper, etc.; the separation is performed by filtering; in the richly contained gold solution, the gold is reduced to gold powder deposited by an oxalic acid reducing agent with strong reducibility, and the impurities such as platinum, the bismuth and the copper, which are reduced simultaneously, are redissolved by nitric acid added later and enter the solution, and the solution is subjected to the filtering separation to obtain pure gold powder; and the pure gold powder is made to be ingot-shaped by fushion casting, and the finished gold ingots with a gold content of 99.99 percent are obtained. In theinvention, the reduction reaction is made by oxalic acid at a low temperature, so that the process of the invention has the advantages of not causing environmental pollution, favorability for the heath of operators, lowering cost, shortening the period and obvious economic and social benefits.

The invention discloses an inner forming process of a tubular lead-acid storage battery, which comprises the following steps of: (1) assembling positive and negative raw polar plates into a battery shell, filling 1.23-1.25g / cm<3> of sulfuric acid solution and standing for an hour so that the polar plates are fully soaked in the acid liquor; and (2) dividing the whole inner forming process into three phases, wherein different charging and discharging currents and time are adopted in different phases. The inner forming process lasts for four days, thereby shortening the production period, omitting the cockamamie sections, such as discharge, water washing, drying, and the like after formation and saving the production cost. Meanwhile, the polar plates are formed in the battery shell in the production process, and therefore, the acid mist is less, the pollution is low, and the body damage to workers is less than that of outer formation.

The invention provides a porous aluminum bar lead alloy surface-coated composite anode applied to zinc electrodeposition and a preparation method thereof. The composite anode is composed of a substrate aluminum bar (1), a reinforcement layer coating the substrate aluminum bar and a surface active layer (4) coating the reinforcement layer, wherein the reinforcement layer comprises a bottom layer (2) and an intermediate layer (3); the bottom layer is a Pb / Ag metal composite layer; the intermediate layer is a lead alloy layer; the surface active layer is a composite manganese dioxide layer containing nano-tungsten carbide; the mass percentage of tungsten carbide in the surface active layer is 0.6-2.4wt.%. The prepared surface-coated composite anode is applied to zinc electrodeposition; compared with the conventional lead-silver alloy anode, the bath voltage is reduced by 120-240mV; the porous aluminum bar lead alloy surface-coated composite anode is long in service life and low in cost; the current efficiency is improved by 2-4%.

The invention provides a novel steel pipe rust remover and a preparation method thereof, and relates to the technical field of metal surface conditioning agents. The rust remover comprises 18-23wt% of hydrochloric acid, 8-13wt% of oxalic acid, 1.8-2.3wt% of a corrosion inhibitor, 1.8-2.3wt% of EDTA, 1.8-2.3wt% of citric acid, 0.25-0.35wt% of an osmotic agent JFC, and the balance of water. The corrosion inhibitor is prepared by compounding urotropine, rosinyl imidazoline ammonium salt and industrial alcohol according to a weight ratio of 3:0.8:5. The novel steel pipe rust remover provided by the invention generates obviously less acid mist than simple acid solutions for rust removal in the prior art in the use process, and the replacement frequency of the rust remover is only 1 / 3 of that of the acid solutions under a same use frequency, so the acid waste is greatly reduced; and almost no steel pipe over-etching conditions appear in the production process, so the production cost of steel pipe enterprises is greatly reduced.