283results about How to "Avoid heavy pollution" patented technology

The invention discloses a method of plating Nickel with magnalium alloy without cyanogen and the plating technique. The direction for the plating solution is: 20 to 80g.dm-3 of copper charred phosphate; one or several of the 60 to 320g.dm-3 of sodium charred phosphate or Potassium charred phosphate or 60 to 250g.dm-3 of sodium citric acid, 5 to 20g.dm-3 of Potassium sodium tartaric acid, 60 to 250g.dm-3 of HEDP and 60 to 250g.dm-3 of amine ethylene; one or several of the 5 to 20g.dm-3 of hydrogen amine di-fluorin or 5 to20 g.dm-3 sodium fluoride or 5 to 20g.dm-3 of Potassium fluoride or 5 to 20g.dm-3 of lithium fluoride. The plating solution chooses the nickel sulfate or alkali type nickel carbonate or nickel acetic acid as the main salt and adds the reducing agent, combination agent and stabilization agent. The plating technique adopts the acid plating copper-plating three nickel-plating chromium. The invention has little pollution to the environment, high binding power and erosion-proof property.

The invention discloses a beneficiation method for complex sulphide lead-zinc ore containing arsenic. The beneficiation method is characterized by comprising the steps that raw ore is added into a ball mill to be milled, lime, zinc sulfate, sodium sulfite and p-xylylenebis(n,n- diethyldithiocarbamate) are added after the milled raw ore enters a first stirring tank, and diethyldithiocarbamate, isoamylxanthate and terpenic oil are added into a second stirring tank; a combined inhibitor and a combined collector are added before first-time scavenging and second-time scavenging of lead floatation; the combined inhibitor and the combined collector are added before first-time lead concentration, second-time lead concentration and third-time lead concentration; zinc floatation is conducted on tailings obtained after lead floatation; the combined inhibitor and the combined collector are added before first-time scavenging and second-time scavenging of zinc floatation; and lime is added before each time zinc concentration is conducted. By the adoption of the beneficiation method, lead-zinc concentrate products qualified in arsenic content are obtained, the grade and yield of lead and zinc in lead concentrate can be increased, and the grade and yield of zinc in zinc concentrate can also be increased; highly toxic products such as sodium cyanide or oxidizing agents do not need to be added, serious pollution to the environment is avoided, and clean, environment-friendly and safe production is achieved.

The present invention relates to purification, recovery and application of waste gas containing volatile organic compound, and the process includes collecting waste gas containing volatile organic compound, cooling the waste gas and filtering in the filter, measuring the temperature of the filtered waste gas and further cooling to below 30 deg.c, adsorbing cooled waste gas in the adsorber, desorbing the adsorbed waste gas with water vapor, condensating and cooling the desorbed gas-liquid mixture in the condensate cooler, gas-liquid separating the condensated and cooled mixture in the gas-liquid separator, mixing the separated gas and the collected waste gas and feeding the gas mixture into the cooler, and recovering water insoluble volatile organic compound and water soluble volatile organic compound separately. The process is used to eliminate air pollution of printing machine, dyeing machine and reaction kettle while creating great economic benefit.

The invention discloses a production method for activated carbon. The production method comprises the following steps of: adding binding agents such as polyphosphates, active silicic acid and the like to raw materials such as pulverized coal and the like, and obtaining a finished product after kneading, extruding, drying and activating the mixture. According to the production method, as the binding agents formed by matching one or several compounds are used for replacing coal tar, the serious pollution caused by using the coal tar as the binding agent can be avoided, and plenty of coal tar with the high cost is saved, and the production cost is reduced. The obtained activated carbon has high strength, very few floating dust and very high adsorptive capacity and can be used for water treatment, deodorization, decolorization, a catalyst carrier, the desorption of CO2 and N2 gasses in pressure swing adsorption, gas phase adsorption, solvent recovery, a carbon catalyst and the like.

Provided is a method for preparing mine fill by utilizing Bayer process red mud. The method belongs to the technical fields of construction materials and solid waste resource utilization. The technical scheme of the method for preparing the mine fill is that the Bayer process red mud, coal ash, lime and gypsum are adopted to serve as raw materials and are evenly mixed according to a certain weight percentage to form the mine fill. The method for preparing the mine fill by utilizing the Bayer process red mud has the advantages that due to the fact that after the Bayer process red mud is hydrated, large amount of ettringite is produced and has high strength in an early period, the ettringite has an function of micro-expansion without shrinkage, and a goaf of a mine can be filled. Compared with cement used for the fill, cost can be saved by more than 60%. The method for preparing the mine fill by utilizing the Bayer process red mud facilitates saving of land source, avoids causing severe pollution to peripheral water bodies, atmosphere and soil, and facilitates environment protection.

The invention discloses a method for refining hypereutectic aluminum silicon-alloy primary crystal silicon tissues, which is characterized in that high-temperature alloy melt bodies after being subjected to qualitative change and structural state change and low-temperature alloy melt bodies in the specific semi-solid temperature region are mixed and melt according to the mass ratio of 1/1 to 2/1, the mixed alloy melt bodies are obtained, the temperature of the mixed alloy melt bodies is reduced to 720 to 750 DEG C under the protection of covering agents, and hypereutectic aluminum-silicon alloy castings are obtained after casting and temperature-reduction solidification. The method has the advantages that the addition of leavening agents is not needed, the serious pollution on production and social environments caused by the use of the ordinary leavening agents is avoided, the average dimension of primary crystal silicons can be refined from about 50mum to 11-13mum under the faster cooling condition (8 to 10 DEG C/s) of the ordinary casting, in addition, the distribution tends to be uniform, and silicon crystal grain corners are passivated.

The invention discloses a universal uranium-thorium conversion-proliferation reactor device and a method for producing a nuclear fuel uranium-233. The universal uranium-thorium conversion-proliferation reactor device comprises a fused salt proliferation layer, a reactor core, a graphite reflecting layer, an instant separator, a disintegration separator and a fluoride fused salt fuel preparation device, wherein the fused salt proliferation layer is a hollow structure, and thorium is taken as a nuclear fertilizer; the reactor core takes uranium as a nuclear fuel and is located in the middle of the fused salt proliferation layer, and a high-temperature fused salt runner is formed in the center of the reactor core; the graphite reflecting layer and the reactor core are located between the fused salt proliferation layer and the reactor core; the instant separator is the separator for the nuclear fuel thorium and Pa-233 after irradiation and located on one side of the graphite reflecting layer; Pa-233 is stored in the disintegration separator, and the disintegration separator is connected with the instant separator; and the fluoride fused salt fuel preparation device is connected with the disintegration separator.

The invention relates to a magnesium-forsterite synthetic sand and a preparation method thereof. The magnesium-forsterite synthetic sand is prepared from the following raw materials in percentage by weight: 30-50% of waste magnesite fine powder, 20-30% of magnesite concentrate tailing powder, 0-20% of active light-burned magnesia powder and 30-50% of boric sludge. The preparation method comprisesthe following steps: sufficiently mixing and rolling waste magnesite fine powder, magnesite concentrate tailing powder, boric sludge, light-burned magnesia and water which accounts for 20 wt% of the raw materials in a wet pan; compacting, and balling to obtain ball billets with the diameters of 40-60mm; and naturally drying until the water content is less than 0.5%, adding into a magnesia shaft kiln, and calcining at 1550-1650 DEG C to obtain the magnesium-forsterite synthetic sand. The invention solves the problem of poor high temperature property of the independently used forsterite, and comprehensively utilizes the waste magnesite fine powder, magnesite concentrate tailing powder and boric sludge, thereby changing wastes into valuable substances and lowering the production cost of the magnesium-forsterite synthetic sand.

The invention relates to a well cementing and completion method for an oil-gas well used for the well-completion operation of petroleum, which comprises the following steps: after the under-balanced drilling operation is completed, a certain number of and adequate types of packers are arranged on a well-completion pipe column (2) according to the measured position of an oil-gas layer and the predetermined interlayer isolation proposal; the position of the oil-gas layer (5) is accurately clamped through an underground control valve or other no-killing trip device, and the well-completion pipe column is landed; when the well-completion pipe column is landed to the predetermined position, the packers (1) are sealed (the packers or oil-expanded packers are filled with cement slurry) or long packer rubber packers (3) are filled with the cement slurry, and interlayer isolation between the oil-gas layer (5) and a non oil-gas layer (4) can be realized under the underbalance condition; and a perforating hole of the oil-gas layer is aligned, so as to communicate a wellbore and the oil-gas layer and perform mining or implement strengthening mining measures. By adoption of the method for well cementing and completion, severe pollution of the overbalance pressure on the oil-gas layer can be avoided during the well cementing process of a lower sleeve after under-balanced drilling.

The invention provides a method for recycling cast waste sand, which is characterized in that: adding calcium chloride or ferrous chloride into the waste sand in a molar ratio of sodium in waste sand to the calcium chloride or ferrous chloride of 2:0.8-1.5 and uniformly mixing the materials to recycle the waste sand. The method can be used for harmless treatment of cast waste sand, namely water-glass sand, to make the cast waste sand a stable and reliable building material that can be used in a large amount. Thus, not only the serious pollution caused by the burying and discarding of the conventional cast waste sand to the ecological environment and great waste of finite resources are prevented, but also the elimination of finite land occupation and the change of the cast waste sand into the building material are realized. The sodium oxide (Na2O) content of recycled waste sand provided by the invention is lower than 1 percent; the recycling cost is low; the selling price is 2 to 3 times the recycling cost; and real 'zero' discharge is realized.

The invention is a reclaiming system and method for oil field waste filter material. The oil waste will contaminate environment and wastes resources. The system is: a coarse sifter is connected to a spiral elevator, the outlet of the filter rinsing process device is arranged above the spiral elevating separator, the drying box is connected to the transmission belt, and the magnetism separator is connected to the transmission belt and multi-layer electric sifter. The method is: the waste material passes through the coarse sifter, spiral elevator, filter rinsing device, the material is rinsed in the device and then it is elevated by the elevating separator, enters the drying box.

The invention discloses an ammonia recovery method from the mixing gas produced in the process of hydrogen cyanide production, comprising ammonia absorption process, decyanation process, desorption process and rectifying process for solving the technical problem. The invention is characterized in that decyanation process is set separately to recovery hydrogen cyanide gas, avoiding the loss of hydrogen cyanide caused by a large amount of acid gas like hydrocyanic acid contained in the ammonium phosphate solution directly steamed in Versum method, reducing production cost of hydrogen cyanide, reducing the emission of the harmful acid gas like hydrogen cyanide, and avoiding the serious pollution of peripheral enviroment. Besides, the ammonium phosphate solution contains a much smaller amout of hydrocyanic acid after hydrogen cyanide is recovered, which can not influence production process and make the production process more safety.

The invention provides an electric deposition preparation method of a Ni-Co-B alloy substituted hard chromium plating, relating to a preparation method of the Ni-Co-B alloy substituted hard chromium plating. The method 1 comprises the following steps of: taking nickel salt, cobalt salt, nickel chloride, boric acid, amine boride, NI3<#> fast high-level nickel-plating glazing agent A and lauryl sodium sulfate; preparing an alloy plating solution; and plating a processed plated part. The method 2 comprises the following steps of: taking nickel chloride, cobalt salt, boric acid, amine boride, NI3<#> fast high-level nickel-plating glazing agent A and lauryl sodium sulfate; preparing an alloy plating solution; and plating a processed plated part. In the invention, a Ni-Co-B alloy plating with uniform brightness, hardness of 770-800HV50 as well as good corrosion resistance and bonding force is obtained at a deposition rate higher than 60mu m/h. In the plating process, the cathode current efficiency is higher than 96%; and after the plating is subjected to heat treatment at 150-400 DEG C for 1-3 hours, the hardness of the plating can be increased to 1055-1108HV50.

The invention discloses a method for producing a solanaceous vegetable seedling growing substrate by utilizing a salvaged material of cassava processing. Cassava peels and starch residues are used as main raw materials, chicken manure and seed tung tree bran or chicken manure and shell powder are used as auxiliary materials, and the excellent solanaceous vegetable seedling growing substrate is produced through fermentation. The substrate is light and loose, has the advantages of good permeability, good water holding and fertilizer retaining abilities, and balanced, scientific and reasonable nutrient supply, can meet the balance demand of solanaceous vegetable crop seedlings on nutrients during a whole growth period, and effectively improves the survival rate, the stress resistance and the growing seedling quality of the solanaceous vegetable growing seedlings. The method realizes harmless treatment and resource utilization of the salvaged material of cassava processing, avoids great waste of resources and serious pollution of the environment, provides a new way for comprehensive utilization of the agricultural salvaged material, reduces the substrate production cost, reduces excessive exploitation of peat resources, protects the natural environment, and has wide application value.

The invention belongs to the field of chemical metallurgical technology, and particularly relates to a method for producing tungsten and tin chemical products directly from tungsten-tin paragenic ore by use of the chemical metallurgical technology. The method comprises the steps of grinding the tungsten-tin paragenic ore serving as a raw material, and performing acidolysis by use of nitric acid to obtain tungsten-tin mixed slag; dissolving the tungsten-tin mixed slag with ammonia water to obtain ammonium tungstate and tin slag; after the ammonium tungstate enters the solution, performing ion-exchange purification with anion gel resin and desorption with ammonium chloride or ammonia water to obtain high-purity ammonium paratungstate; with lignite as a reducing agent and a non-metal mineral as a stabilizer, performing reduction stabilization of the tin slag, and leaching out the tin with sulfuric acid; performing liquid-phase oxidation and dehydration drying to obtain tin dioxide; performing corresponding after-treatment on the waste gas and waste liquid generated in the preparation process. The method provided by the invention can be used for effectively producing tungsten and tin chemical products at the same time, avoids resource waste and can guarantee the quality of the tin products and relatively low cost as well as the quality of the tungsten products.

The invention discloses a method for preparing an adsorbent by using semi-coke modification. The method is characterized by comprising the following steps: grinding and screening semi-coke, thereby obtaining 80-200-mesh semi-coke powder; adding the semi-coke powder into an aqueous solution of nitric acid, carrying out stirring reaction at the temperature of 50-95 DEG C for 6-24 hours, filtering, drying, adding the powder into a muffle furnace, activating at the temperature of 300-500 DEG C for 10-60 minutes, grinding the activated product to 180-200 meshes, thereby obtaining the target product adsorbent. The adsorbent prepared by the invention has excellent adsorptive property, particularly has an excellent adsorption effect on phenolic substances in wastewater and has equivalent adsorptive property to that of commercial grade activated carbon. Moreover, the used semi-coke refers to industrial waste semi-coke, the wastes are changed into valuable materials, the process is simple, and the product application is wide.

The invention discloses a beneficiation method for copper-lead sulphide ore, and belongs to the technical field of beneficiation. The method comprises raw ore grinding, copper-lead mixing flotation and copper-lead separation. Copper-lead mixing flotation comprises primary copper-lead roughing, tertiary copper-lead fine selecting and secondary copper-lead scavenging. Copper-lead separation comprises primary copper roughing, tertiary copper fine selecting and secondary copper scavenging. Lime, calcium hypochlorite, zinc sulfate, sodium sulfite, sodium sulphide, dimethyl dicarbonate, sodium pyrophosphate, sodium citrate, ethionine ester, ethyl thio carbamate, sodium n-butylxanthate, aniline aerofloat, diphenyl amino phosphorodithioic acid and sodium carbonate are added in the copper-lead roughing and copper-lead scavenging processes. Lime, water glass, sodium phosphate starch, carboxymethyl starch, phthalic acid, thiosalicylic acid, ethionine ester and sodium ethylxanthate are added in the copper roughing and copper scavenging processes. The beneficiation method solves the problem that in the process of beneficiation of the copper-lead sulphide ore through a traditional flotation method, the copper and lead recycling rate is low.

The invention relates to the technical field of beneficiation, in particular to a beneficiation method for separating copper and zinc from copper-zinc sulfide ore. The invention discloses a beneficiation method for complex copper-zinc sulfide ore. The beneficiation process comprises the steps of an ore grinding method, a using method of a combined inhibitor in flotation and a using method of a combined collecting agent. The method, based on the principle of clean and environment-friendly production, aims to improve the recovery rate of copper, zinc and associated gold, reduce the problem of serious mutual content of copper and zinc concentrates and improve economic benefits. The beneficiation method is feasible in technology and copper-zinc minerals are separated in an environment-friendlymanner, wherein valuable metal complex copper-zinc sulphide ore is comprehensively recycled, use of sodium cyanide or an oxidizing agent in beneficiation can be omitted, the copper-zinc recycling rate is effectively increased, the precious metal gold recycling rate is increased, meanwhile, mutual content of concentrate impurities is reduced, economic benefits of enterprises are increased, and economic benefits of enterprises are increased. Meanwhile, environmental pollution caused by ore dressing tailing discharge is reduced, and industrial clean, environment-friendly and safe production is achieved.