53results about How to "Detoxify thoroughly" patented technology

The invention belongs to the technical field of chromium residue detoxifying, and discloses a chromium residue detoxifying process. The process comprises the following steps of: performing wet grinding on chromium residue, adding water into the chromium residue to prepare chromium residue slurry; and after being subjected to acid-leaching reduction reaction, performing solid-liquid separation on the chromium residue slurry to obtain a filter cake, namely the detoxified chromium residue. The process is characterized in that: under the condition of not changing the original alkaline environment of the chromium residue, a reducing agent 1 is added into the chromium residue directly, and then the reducing agent and the chromium residue are subjected to wet grinding to form particles with 100 to 300 meshes; and the water is added to prepare the chromium residue slurry with 30 to 45 baume degrees, wherein the reducing agent 1 is sodium sulphide, sodium bisulfide, sodium thiosulfate or sodium pyrosulfite. The process has simpleness, thorough detoxification, no chromium return phenomenon and easy implementation of mass production; and the process prolongs effective reduction reaction time, improves reaction efficiency, saves the using amount of acid during the acid-leaching reduction, and has low processing cost because Cr6+ in the chromium residue is subjected to two times of dissolution and reduction.

A new harmless comprehensive utilization technique for wet processing chromic slag comprises steps as follows: ball milling chromic slag to 80-200 meshes, adding water to prepare slurry, immersing the slurry in hydrochloric acid solution, regulating the pH to 5-6, performing solid-liquid separation with filter press, in the immersion liquid after separation, the hexavalent chrome is reduced to trivalent chromium, adding sodium hudroxide aqueous solution, regulating the pH to 4-6, roughly preparing chromic hydroxide, adding sulfuric acid into filtrate, regulating the pH to 5-6, removing the calcium coprecipitated with magnesium in the rest filtrate, preparing the 2-water calcium sulphate whisker, adding alkali to the filtrate after filter-pressing to regulate the pH to 9-12 to synthesize super-fine magnesium hydroxide powder; the solution after filter-pressing is concentrated to prepare sodium chloride. The main contents of extracts within the chromic slag treated by wet processing all can meet primary, secondary or even accredited national or ministerial standard. The technique can thoroughly detoxicate Cr<6+> in chromic slag and can prepare nine products, includiing chromic hydroxide, magnesium hydroxide, ammonium hydroxide, silicon dioxide, magnetic ferrous ferricoxide, 2-water calcium sulphate, corundum intermediate, sodium chloride, and tailings-chromite; and the extracts after processing chromic slag have high quality.

The invention belongs to the technical field of chromium chemical industry and chromium salt clean production, and in particular relates to a wet detoxification method of hexavalent chromium contained alkali waste residues. According to the method, the method comprises the following steps of: first, slurrying the chromium residues; and then adjusting the pH value of the slurry to 7-10; adding a stabilizing agent and a reducing agent to the completely slurried slurry at 20-150 DEG C; and reducing the hexavalent chromium to trivalent chromium, wherein the trivalent chromium can stably exist in the chromium residue for a long period. The leaching toxicity of the obtained chromium residue, which conforms to State Environmental Protection Industrial Standard issued by the Ministry of Environmental Protection, is less than 3 mg/L. Compared with the prior art, the wet detoxification method of the hexavalent chromium contained alkali waste residues, provided by the invention, has the advantages of simple process, less usage of the reducing agent, low cost, complete reduction of the hexavalent chromium, no rebound, low reducing reaction temperature, suitability for industrial production and better promotion and application prospect.

The invention discloses a method for directly producing chrome-base alloy steel by comprehensively using calcium-free chrome slag, which is implemented by the steps of weighing, material preparation, reduction smelting, slag discharge, iron discharge, refining pouring and the like. The chrome-base alloy steel is prepared by the following steps of: adding a reducing agent into the calcium-free chrome slag; smelting the calcium-free chrome slag in a smelting furnace; and directly introducing the molten chrome and iron into a refining furnace to perform oxygen blowing decarburization refining. The chrome-base alloy steel comprises the following main components: 0.2 to 6.0 percent of carbon (C), 8.0 to 50.0 percent of chromium (Cr), 0.3 to 1.0 percent of silicon (Si), less than or equal to 0.05 percent of sulphur (S), less than or equal to 0.05 percent of phosphorus (P) and 0.1 to 0.5 percent of vanadium (V). The alloy steel can be directly used for manufacturing or forging various wear resistant materials, such as cement, wear resistant steel balls for power and mineral separation, forging steel or liners and the like. In the method, the chrome-base alloy steel product is directly produced by using the calcium-free chrome slag as a raw material, so that the calcium-free chrome slag is completely detoxified and the limited chrome resource is recycled. Thus, the method has a great significance for clean chrome salt production and waste slag recycling.

The invention discloses a method for detoxicating municipal solid waste incineration fly ash by microwave heating, which includes the following steps: (1) the heavy metal leaching content of the municipal solid waste incineration fly ash is sampled and detected; (2) the municipal solid waste incineration fly ash is fed into a microwave heater through a feeder; (3) the municipal solid waste incineration fly ash is heated under a temperature of 850-1200 DEG C; (4) the detention time of the fly ash in the microwave heater is controlled within 10-60 minutes; (5) the heavy metal is absorbed and enriched by activated carbon, then waste gas generated is pumped into Mg(OH)2 solution for deacidification treatment and is discharged into the atmosphere; and (6) the fly ash after treating is discharged in the form of a cloddy solidified body and is detected according to a standard. The processing method of the invention has fast speed, low energy consumption, and complete detoxification, is especially suitable for treating the fly ash which simultaneously contains a plurality of heavy metals, and has no special requirements on heating atmosphere. The method of the invention is suitable for the harmless treatment of the municipal solid waste incineration fly ash and poisonous and harmful powder solid wastes which contain heavy metal, dioxin and the like, in the environmental protection industry.

The invention relates to a chromium slag treatment when coupling and reducing hexavalent chromium from chromium slag, wherein said method comprises using wet method to break, and adding the solution with acid and reducer, controlling the pH value, reducing the density of hexavalent chromium; transferring the liquid-solid mixture to another reactor, adding acid and reducer, mixing to reduce the hexavalent chromium; adding anaerobe, emerging. The acid can be sulfuric acid, etc; the reducer can be sulfite, etc; the anaerobe can be the mixture of SRB, Pseudomonas putida and Escherichia coli.

The invention discloses a method for clean method for producing sodium bicarbonate and sulphur by means of Glauber salt wet method for reducing the emission of CO2 and avoiding the discharge of wastewater, which comprises the following steps: A, sodium sulphide preparing process, B, hot carbonatation process, C, sulphur preparing process, D, cold carbonization process, and E, mother liquor purifying. Glauber salt coal is reduced and calcined into sodium sulphide, and the sodium sulphide solution is heated and carbonized into a mixed solution with the soda as the main component by use of sodium bicarbonate, then the mixed solution is cold-carbonated by CO2 to separate out NaHCO3 crystal, which is dried to finally obtain the soda in conformity with relevant standard. The production method has the advantages of simple process, environmental friendliness, no pollution, full circulation of the mother liquor, and no wastewater discharged.

The invention discloses a chromium resource recycling and detoxification processing method for chromium slag, and belongs to the field of detoxification processing and resource recycling for chromium slag. The method comprises the specific steps that 1, water is added into the chromium slag, and the water and the chromium slag are mixed to be uniform; 2, a mineralizing agent is added into the solution obtained in the step 1, sufficient stirring is carried out, and a mixed solution is obtained, wherein the mineralizing agent is prepared from potassium sulphate, potassium peroxodisulfate and sodium carbonate; 3, the mixed solution is processed through a hydrothermal method or a direct heating method; 4, after heating processing is finished, the solid-liquid mixture is naturally cooled to be at room temperature for standing; 5, solid slag is separated from liquid supernatant containing chromium, and the filter slag is washed with water and dried again; and 6, the solution containing chromium is recycled and returned into a workshop section, or chromium is recycled. The method is simple in process, low in cost, capable of becoming effective rapidly, large in processing capacity, thorough in detoxification and capable of achieving whole slag utilization, and has high social benefits and economic benefits.

The invention relates to a chlorate factory chromium salt mud harmless treatment and chromium separation and recovery method. The method comprises mixing chromium salt mud and water, heating the mixture, carrying out elution, carrying out solid-liquid separation to obtain filtrate and filter residue, mixing the filter residue and water to obtain a uniform mixture, carrying out oxidation and chromium impregnation, carrying out solid-liquid separation to obtain leachate and leaching residue, washing the leaching residue to obtain dechromed tailings, recycling the washing solution after washing, adjusting pH of the leachate, adding a reducer into the leachate for reduction chromium removal, carrying out solid-liquid separation to obtain a dechromed solution and chromium hydroxide, carrying out crystallization separation on the dechromed solution to obtain sulfate and recycling the mother liquid obtained by crystallization separation. The method can realize high efficiency separation and recovery of chromium in chlorate factory chromium salt mud and thorough removal of toxicity of the dechromed tailings. The method has simple processes, a low cost and a good industrial application prospect.

The invention discloses a method for comprehensively treating waste iron oxide desulfurizer and chromium slag so as to solve the problems that the conventional waste iron oxide desulfurizer contains FeS, the treating process is complex, the safety is low, the investment is high, the running expense is high and certain defects are existent in the conventional chromium salt detoxifying method. The method comprises two steps of pre-treating and mixing for reaction. According to the method, the two wastes are skillfully treated by each other and interact with each other to achieve the purpose of treating wastes with wastes; harmless treatment on the waste iron oxide desulfurizer and the chromium slag is effectively achieved while no other additive is used, so that the treatment cost is effectively reduced; the method is simple in process and convenient to operate, and has the characteristics of energy conservation, economy and environmental protection; the method is of important significance for solving the problem of the treatment of the waste iron oxide desulfurizer and the chromium slag, and especially can be used for effectively treating the chromium slag to effectively reduce harm of the chromium slag to the environment.

The invention provides a detoxification method of chromium-containing slag entering metallurgical blast furnace by using coal spraying process form. The method comprises the following steps: first drying and grinding the chromium-containing slag, then uniformly blending chromium-containing slag in an amount of 1 to 15 percent of the weight of coal powder into the coal powder, spraying the coal powder blended with the chromium-containing slag into a blast furnace cylinder from a blast furnace coal-spraying system, detoxifying the hexavalent chromium in the chromium-containing slag at the high temperature of the blast furnace under the reducing atmosphere, reducing the hexavalent chromium into trivalent chromium, and finally reducing the trivalent chromium into a chromium metal, wherein 92 to 98 percent of the chromium metal is melted into molten iron and 2 to 8 percent of the chromium metal enters the furnace slag; and meanwhile, reducing the iron oxide in the chromium-containing slag into iron metal for entering the molten iron. By utilizing the sealed blast furnace coal-spraying system to directly spray the chromium-containing slag into the blast furnace cylinder, the method has the advantages of few links, no pollution, thorough detoxification due to direct and full utilization of the high-temperature reducing atmosphere, full recycling and lowest cost compared with that of the conventional methods for treating chromium-containing slag.

The invention discloses a method for lowering chromium pollution risk in electric furnace slag. The method includes: putting molten stainless steel slag into a slag tank, adding a modifier, and stirring to enable the modifier and the molten stainless steel slag to be mixed well; cooling at a cooling speed of smaller than 20 DEG C/min to below 1300 DEG C to realize chromium-direct-stable spinel phase enrichment; performing hot braising on the slag. The stainless steel slag is thorough in detoxification; after the molten stainless steel slag is well mixed with the modifier, cooling is performed,so that chromium-direction-stable spinel phase enrichment can be realized, and environmental discharging standards can be met completely. The treatment process is low in energy consumption, sensibleheat of the molten stainless steel slag is utilized, and external adding of energy consumption and equipment is not needed, so that the method has great advantage in the aspect of treatment cost. Treated stainless steel slag can be further recycled, and hot-braised stainless steel slag can be safely used in products like cement and roadbed materials.

The present invention provides a method of industrial residue recycle, especially a method of extracting superfine ferric oxide from waste residue. The technical solution is divided into three process of the method of extracting superfine ferric oxide from waste residue, firstly a detoxifcation process, adopting rotary kiln incineration and detoxifcation; secondly an extracting manufacturing ferric oxide, preparing iron oxide red by LAUX method; thirdly a process of preparing nanometer superfine ferric oxide, using chemical reaction method. The invention can produce beneficial results: a method of extracting superfine ferric oxide utilizing toxic waste residue ''chrome residue'' which being a material of extracting superfine ferric oxide, changing waste into valuable, and also utilzing industrial acid waste, protecting environment. The invention has a strong operability, complete detoxifcation, high economic value, evident predominance; the method is easy to control, the prepared nanometer iron oxide yellow has a small granularity, evenly distribution.

The invention relates to the technical field of refined cotton and discloses a refined cotton opening machine high in cotton opening efficiency. The refined cotton opening machine high in cotton opening efficiency is used for decomposing a cotton package (9) into sheet matter or floccule. The refined cotton opening machine high in cotton opening efficiency comprises a feeding device, a defibering device and a feeding plate (1) arranged between the feeding device and the defibering device. The defibering device comprises at least two stages of defibering rollers used for defibering of the cotton package (9), the defibering rollers are sequentially arranged in a staggered mode from the feeding end to the discharging end, defibering teeth are arranged on the outer layers of the defibering rollers, the defibering device comprises the two stages of defibering rollers used for defibering of the cotton package (9), the defibering rollers are composed of the first-stage defibering roller (2) and the second-stage defibering roller (3), and a pre-pressing roller (4) is arranged between the first-stage defibering roller (2) and the second-stage defibering roller (3). By means of the refined cotton opening machine high in cotton opening efficiency, defibering efficiency is improved, the labor intensity of workers is lowered, and it is also guaranteed that defibering quality meets the technological requirement.

The invention relates to a digital persuasion system for assisting detoxification, which comprises a value field, an emotion field, an action field, an information field and a knowledge field. The value field influences the emotion field, the action field, the information field and the knowledge field. The knowledge field includes personal long-term memory and group long-term memory. The information field includes personal short-term memory and group short-term memory. Under the guidance of the value field, the knowledge field oriented to specific problems is established and is fed back and applied to the human-machine interactive information field, and by continuously and repeatedly correcting the personal short-term memory, the personal long-term memory is modified. The digital persuasion system, for an auxiliary detoxification system which is a social technical system, exerts influences on drug addicts to abandon drugs from inside to outside by means of computer technology and information technology as a technical means, persuades the drug addicts to change wrong thoughts and ideas, and assists the drug addicts to develop the correct values, cultivate good habits, to achieve rapid and thorough detoxification.