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2530results about "Waste water treatment from metallurgical process" patented technology

Processing method for stainless steel acid cleaning waste water and liquid

InactiveCN101269889AMeet emission compliance requirementsMeet compliance requirementsSludge treatment by de-watering/drying/thickeningIron oxides/hydroxidesLiquid wasteSludge
The invention relates to a processing method of stainless steel pickling waste liquid, which is characterized in that the processing method includes the steps that: neutral salt wastewater flows into a neutral reduction cell, and mixed acid pickling waste waters flow into a neutralizing tank; reducing agent is added into the neutral reduction cell, and then the reduced wastewater liquid is put into the neutralizing tank and is mixed with the adjusted mixed acid pickling waste waters, and liquid alkali is added into the neutralizing tank; the separated clear waste liquid removes fluorin ions in a settlement tank; neutralizing liquid is added into a final neutralizing tank to cause the pH value of treatment liquid to adjust to be neutralized wastewater liquid which passes through a sand filter to be discharged. The processing method has the advantages that metal ions and fluorin ions are performed the subsection treatment, and neutralizing agent is changed into the liquid alkali from lime cream, the requirement of reaching the standard of the waste liquid emission is not only achieved, but also the mud quantity produced by a mass of lime cream is greatly reduced, heavy metal mud of a retention pond only contains heavy metal compound, the salts of calcium fluoride and calcium sulphate, etc. are separated from the inclined plate settlement tank during the fluoridation stage, thereby the treatment cost is effectively lowered.

Method for purifying electroplating wastewater and comprehensively utilizing resources

The invention relates to a method for purifying electroplating wastewater and comprehensively utilizing resources, which is to adopt low-cost strong basic anion-exchange resin containing macropores and imidazole structure to reclaim valuable resources in the electroplating wastewater by coupling technology based on a chemical oxidation-reduction method, a precipitation method and an ion exchange method. The method comprises the following steps: firstly, Cr(III) is oxidized into Cr(VI) under basic condition through a chemical reaction; then, Zn, Cu, Ni and other heavy metal elements in the wastewater are transformed into precipitation of hydroxide; and finally, the Cr(VI) in the wastewater is adsorbed by the strong basic anion-exchange resin, the purified water quality achieves the requirement of electroplating pollutant discharge standard and recycle, and the Cr and other heavy metal resources in the electroplating wastewater can be comprehensively reclaimed and utilized. The method overcomes the defects that the prior regenerating process of porous weak-basic resin requires acidification, and the method has the advantages of simple process, low treatment cost, large treatment quantity and acid and base consumption conservation, and is the electroplating wastewater treatment method with green environmental protection and efficient utilization of resources.

Recycling method for treating stainless steel pickling acid pickle and wastewater

The invention relates to a recycling method for treating stainless steel pickling acid pickle and wastewater, belonging to the field of treatment of industrial acid pickle and wastewater in iron and steel and metallurgy industries. The acid pickle and wash wastewater generated during stainless steel pickling are collected according to quality and category and the acid pickle is subjected to acid recycling. The acid pickle and wash wastewater are treated through fractional precipitation by adopting lime as a neutralizing agent. Calcium sulfate or calcium fluoride or a mixture of calcium sulfate and calcium fluoride is obtained through precipitation under the acidic condition (the pH value is equal to 3.0+/-0.5) and can serve as a cement filler or a material for brickmaking or a building material after heavy metal polluted calcium salt is removed. A metal hydroxide is obtained through precipitation under the alkaline condition (the pH value is not more than 9.0) and can serve as a stainless steel smelting raw material as the quality of the product is better than that of the imported laterite-nickel ores in China. The calcium nitrate containing wastewater obtained after the acid pickle is treated is not needed to be discharged or treated and can be recycled. After being treated, the wash wastewater can be reused as production line wash water.

Technique and system for zero discharging treatment of electroplating effluent

The invention discloses a technique and a system for zero discharging treatment of electroplating effluent. The system comprises a material classifying pre-treatment system, a biochemical comprehensive treatment system, a membrane method system, a membrane concentrated liquor vaporization system and a sludge classifying treatment system which are connected with each other in turn, wherein the sludge classifying treatment system is connected with the material classifying pre-treatment system and the biochemical comprehensive treatment system; the raw wastewater enters into the material classifying pre-treatment system; water generated by the membrane method system is recycled; the condensed liquid from the membrane concentrated liquor vaporization system is re-injected into the material classifying pre-treatment system. According to the technique provided by the invention, the wastewater is firstly treated in classifying form, so that the heavy pollution ions, such as, chromium, cyanogen, nickel, and the like, and the oily matters in the wastewater are effectively removed, and then the biochemical comprehensive treatment system is used for further treating, and lastly, the RO+SuperRo two-level combination mode is utilized to achieve the gross recovery at 94%, and meanwhile, the liquid amount for evaporation treatment is less than 6% of the gross wastewater quantity, the cost of the evaporation treatment is saved, the sludge is recycled, the waste of resources is avoided and the sludge treating cost is saved.

Processing method for recycling electroplating concentrated control zone electroplating waste water resource

The invention relates to a processing method for recycling an electroplating concentrated control zone electroplating waste water resource, which comprises the following steps: firstly, preprocessing the inverted trough water in the electroplating production process, recycling valuable metals in the inverted trough water, and respectively filling the pretreated tail water in corresponding processing systems according to kinds; then, recycling copper, nickel and chromium resources in the corresponding processing system; afterwards, mixing other drain away water in a base station and the waste water with recycled copper, nickel and chromium resources, and then carrying out integrated structure breaking, neutralizing and coagulating sedimentation, and mixing the treated waste water and the pretreated water by treatment of oil separation, oil removal and coagulating sedimentation for biochemical treatment; and finally, discharging the effluent which reaches the standard. The method not only enables the electroplating waste water to reach the standard and can be discharged stably, but also recycles the valuable resources in the waste water in low cost, greatly reduces the secondary pollution and realizes the clean production of electroplating waste water control and the environmental requirements of the electroplating concentrated control zone.

Treatment method of chemical nickel-plating wastewater

The invention discloses a treatment method of chemical nickel-plating wastewater. The method comprises the following steps: (1) treating nickel-plating wastewater with strongly basic anion-exchange resin so as to destabilize nickel complex; (2) adsorbing nickel ions contained in the nickel-plating wastewater with strongly acidic cation-exchange resin; (3) adding a strong oxidant in the nickel-plating wastewater so that hypophosphite, phosphite and macromolecular organic acid complexing agent which are contained in the wastewater are oxidized so as to form phosphate and organic micromolecules;(4) carrying out pulse electrocoagulation on the nickel-plating wastewater so that the phosphate forms iron phosphate to be precipitated and residual nickel ions are oxidized to form oxidized scale precipitate at the same time; and (5) regulating the wastewater to alkalinity so that iron ions in the wastewater are precipitated, successively adding a deironing agent and a flocculant to remove ferrous ions and suspended matters in the wastewater, and directly discharging supernate. According to the invention, the content of the nickel ions in the wastewater treated by the process is far less than 0.1ppm and meets a national primary standard, the recycle of nickel resources can be realized, and the economic benefits of wastewater treatment are improved.

Harmless comprehensive treatment method for cyanide-containing tailing pulp

The invention discloses a harmless comprehensive treatment method for cyanide-containing tailing pulp. The method is composed of three steps including pulp concentration, cyanide-degradation pretreatment and oxidation, wherein the step of pulp concentration is implemented as follows: the concentration of pulp is increased to be 50% by using a thickener, and applyin liquid supernatant subjected to thickening is applied to a factory selection process, wherein a thickening principle is implemented as follows: solid-liquid separation is conducted by using gravity settling; the step of cyanide-degradation pretreatment is implemented as follows: a cyanide-degradation drug is put into the pulp subjected to concentration; and the step of oxidation is implemented as follows: oxidation is implemented by using a commonly used oxidation method, and meanwhile, activated carbon is put in the stage of oxidation. Useful cyanides are concentrated and recycled, so that the load of follow-up processing is reduced; through the step of cyanide-degradation pretreatment, the cyanide load of an oxidated part is reduced, cyanides such as ferric-cyanide which are difficult to oxidize are fixed, and an oxidant is saved; pulp can easily reach the standard in the process of oxidation treatment, and is stable; and tailing slag which reaches the standard through processing are common solid wastes.

Method for preparing ozone catalytic oxidation catalyst for treating coking wastewater

The invention discloses a method for preparing an ozone catalytic oxidation catalyst for treating coking wastewater, which is characterized in that: amorphous alumina is taken as carrier powder; and in the rolling granulating process, active ingredients, namely vanadium, iron and manganese are sprayed in a solution mode and are granulated, cured, dried and roasted to prepare a finished product catalyst. The catalyst is mainly used for removing nonbiodegradable organic pollutants from the coking wastewater. The amorphous alumina is prepared by quickly dehydrating industrial aluminum hydroxide at a high temperature, and has the specific surface area of 150 to 350m<2>/g, the total pore volume of 0.20 to 0.45ml/g and the average particle size of 1 to 80mu m. The active ingredients, namely the iron and the manganese in the mode of nitrate and the vanadium in the mode of ammonium metavanadate are added with water to be prepared into solution, and the spray amount of the solution is 2 to 50 percent based on the total mass of the amorphous alumina. The load capacity of the active ingredients, namely the iron, the manganese and the vanadium is 0.1 to 20.0 weight percent based on the total mass of the amorphous alumina.

Processing method and device for recovering precious metals contained in electroplating wastewater

The invention provides a processing method for recovering precious metals contained in electroplating wastewater and realizing zero draining, comprising the following steps of: preprocessing the electroplating wastewater; carrying out two-stage resin adsorption; carrying out safety filtration; carrying out ultrafiltration; carrying out reverse osmosis; carrying out activated carbon fiber adsorption; and processing a resin mixed bed. The invention also provides a processing device for recovering the precious metals contained in the electroplating wastewater, comprising a plurality of stages of rinsing channels and a pipeline which are arranged on an electroplating production line, wherein overfalls positioned on the top of the first-stage rinsing channel is connected with a collecting tank through the pipeline; the collecting tank is provided with a medicine addition device; and the outlet end of the collecting tank is sequentially connected with a preprocessing filtering machine, a resin adsorption drum, a safety filter, a reverse osmosis membrane assembly, a carbon fiber filter and the resin mixed bed. In the invention, processed pure water is returned to the rinsing channels for recycling by adopting an efficient adsorbing material and membrane osmosis combination technology, the precious metals contained in the electroplating wastewater are completely recovered, elemental metals or concentrates and crystallizes are reduced into metal salt through extraction and backextraction, the recovery processing and the zero draining of the electroplating wastewater are realized.
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