Method for recycling hexavalent chromium in electrolytic manganese production tail end wastewater

The invention provides a method for recycling hexavalent chromium in electrolytic manganese production tail end wastewater, which comprises the following steps of: filtering electrolytic manganese production tail end wastewater and adjusting pH to be between 3 and 4; enabling anion exchange resin to adsorb Cr<6+> in the wastewater by an exchange column filled with the anion exchange resin under the conditions of the temperature of 10-50 DEG C and the flow rate of 3-6BV/h; when the anion exchange resin is saturated after adsorbing Cr<6+>, using NaOH as a regenerant and regenerating the anion exchange resin by the exchange column under the condition of the flow rate of 3-4BV/h. By utilizing the method of the invention, after the electrolytic manganese production tail end wastewater is processed, the discharge water is colorless and transparent and the chromium ion concentration approaches zero and is far lower than a discharge threshold value specified by the nation. Meanwhile, chromium ions ...

Complete set of cleaning producing technique for extracting soluble manganese from manganese residue by using anode liquor

The invention discloses a unitized cleaning production technique for extracting soluble manganese from the manganese slag by adopting anode liquor, comprising the following steps that: a. the manganese and the anode liquor generated in the process of electrolytic manganese metal production are transported to an extracting device, the sulphuric acid with a volume 0 to 0.025 times of the anode liquor is added, the solid-to-liquid weight ratio of manganese slag to the added fluid ranges from 1:1 to 1:15; b. the manganese slag and the anode liquor are mixed evenly by stirring to obtain the extracting fluid; c. the extracting fluid is let stand in the extracting device to ensure that the solid substance in the extracting fluid subsides; d. the clear solution after the sediment is filtered and returns directly to the leaching oxidizing process in the process of electrolytic manganese metal production for preparing the electrolysing solution; the filtration residue and the dregginess in the extracting ...

Comprehensive resources treatment method of waste circuit board

Method for reducing MnO2 in anode mud to MnO by using high-temperature reduction method

The invention relates to a method for reducing principal component MnO2 in waste anode mud produced in electrolytic manganese production process to MnO by using high temperature direct reduction method, and belongs to the resource utilization and environmental protection fields. The method comprises the steps of mixing electrolytic manganese anode mud and a reducer in a reaction vessel, allowing reaction at 800-1,600 DEG C for 1-6 hours, naturally cooling to room temperature under the protection of nitrogen gas and reducing atmosphere to obtain a mixed product containing MnO particles, and directly recycling to electrolytic manganese production or further separating and purifying to obtain MnO product. The inventive method solves the waste pollution and resource utilization problems in electrolytic manganese industry, produces new product with high added value by using anode mud, recycles and reutilizes resources, and can bring distinct economic, environmental and social benefits.

Method for recycling hexavalent chromium in electrolytic manganese production tail end wastewater

The invention provides a method for recycling hexavalent chromium in electrolytic manganese production tail end wastewater, which comprises the following steps of: filtering electrolytic manganese production tail end wastewater and adjusting pH to be between 3 and 4; enabling anion exchange resin to adsorb Cr<6+> in the wastewater by an exchange column filled with the anion exchange resin under the conditions of the temperature of 10-50 DEG C and the flow rate of 3-6BV/h; when the anion exchange resin is saturated after adsorbing Cr<6+>, using NaOH as a regenerant and regenerating the anion exchange resin by the exchange column under the condition of the flow rate of 3-4BV/h. By utilizing the method of the invention, after the electrolytic manganese production tail end wastewater is processed, the discharge water is colorless and transparent and the chromium ion concentration approaches zero and is far lower than a discharge threshold value specified by the nation. Meanwhile, chromiumions ...

Preparation method of electrolytic manganese slag autoclaved brick

The invention provides a preparation method of an electrolytic manganese slag autoclaved brick. The method comprises the following steps: after preprocessing the electrolytic manganese slag, adding river sand (or fly ash), broken stone and lime in proportion; and stirring, assimilating, rolling, molding, standing, autoclaving and curing, and the like to obtain the electrolytic manganese slag autoclaved brick. The product meets the corresponding index requirements of Autoclaved Sand-lime Brick (GB11945-1999) or Fly Ash Brick (JC239-2001) for a first quality product with the strength level of more than 15MPa. The method has simple technology, high product quality, low production cost and good social, economic and environmental benefits.

Method for preparing construction material by utilizing electrolytic manganese slag

The invention provides a method for preparing a construction material by utilizing electrolytic manganese slag, including the following steps: (1) pretreatment: additive is blended in the electrolyticmanganese slag, water is added for fully stirring, and the raw material reacts in the open air for 1-7 days, wherein the added additive is mixture of lime, plaster and kaolin; (2) cement, sandstonescoarse aggregate, sandstones fine aggregate and component selection air entraining agent are added into the electrolytic manganese slag after the pretreatment, water is added and blended evenly to form a mixture; (3) the mixture is loaded into a mould and formed on a compression forming machine by vibration and pressurizing, and then demoulding is carried out; (4) adobe is naturally cured for 14-28 days, thus obtaining the electrolytic manganese slag construction material product. The technique is simple with high product quality and low production cost and has good social, economic and environmental ...

Complete set of cleaning producing technique for extracting soluble manganese from manganese residue by using anode liquor

The invention discloses a unitized cleaning production technique for extracting soluble manganese from the manganese slag by adopting anode liquor, comprising the following steps that: a. the manganese and the anode liquor generated in the process of electrolytic manganese metal production are transported to an extracting device, the sulphuric acid with a volume 0 to 0.025 times of the anode liquor is added, the solid-to-liquid weight ratio of manganese slag to the added fluid ranges from 1:1 to 1:15; b. the manganese slag and the anode liquor are mixed evenly by stirring to obtain the extracting fluid; c. the extracting fluid is let stand in the extracting device to ensure that the solid substance in the extracting fluid subsides; d. the clear solution after the sediment is filtered and returns directly to the leaching oxidizing process in the process of electrolytic manganese metal production for preparing the electrolysing solution; the filtration residue and the dregginess in the extracting ...

Vacuum distillation industrial device special for recycling abandoned nickel and cadmium cell

Integrative method of two-stage acid leaching, washing and filter pressing for manganese powder pickle liquor

The invention relates to an integrative method of two-stage acid pickling, washing and filter pressing for manganese powder pickle liquor in a membrane filter press, which is applied to the processing procedures of manganese powder leaching and filter pressing in an electrolytic manganese metal industry. The method comprises the following steps: (1) feeding materials; (2) carrying out acid leaching and washing for anolyte at twice; (3) washing by circulating water; (4) washing by a solution with lower manganese concentration or clear water; and (5) carrying out the filter pressing for a filter cake to finish operation. The invention can reduce manganese carbonate content (calculation by manganese) in an original filter pressing technology for manganese residues in the electrolytic manganese metal industry from 1.5%-2.0% to below 0.6%; manganese sulfate (calculation by manganese) can be reduced to below 0.8% from 1.5%-2.0% and the recovery rate of the ammonium sulfate can reach above 50% ...

Vacuum distillation industrial device special for recycling abandoned nickel and cadmium cell

The invention relates to vacuum distilling industry equipment which is specially used for the reclaiming of waste cadmium-nickel batteries. The equipment comprises a furnace body, and the invention is characterized in that at least a set of vacuum distilling pot (4) is arranged in the furnace body (1). The vacuum distilling pot (4) is divided into a heating section and a condensing section. A calcining trough (11) is arranged in the vacuum distilling pot (4). A cooling water clamping sleeve (14) is arranged on the pot body in the condensing section of the vacuum distilling pot (4). The water inlet and the water outlet of the cooling water clamping sleeve (14) are respectively connected with a water inlet pipe and a water outlet pipe. A vacuum port which is connected with a vacuum pipe (7) is arranged on the vacuum distilling pot (4). The other end of the vacuum pipe (7) is connected with a vacuum pump. The outlet end of the vacuum distilling pot (4) is provided with a sealing piece (13) ...

Set technique for extracting cadmium from waste and old nickel-cadmium battery, and producing ferro-nickel alloy

The invention discloses a complete set of technique which can extract cadmium and produce ferronickel alloy from waste nickel to cadmium cell. The invention crushes the waste nickel to cadmium cell and then put the waste nickel to cadmium cell into a low temperature roasting kiln to carry out preroast, and the roasted materials and the reducing agent are mixed to conduct vacuum distillation to collect the product of cooling section and after refining, excellent cadmium is produced; the materials that are not vaporized can produce ferronickel alloy after being refined. The invention realizes the separation and exaction of cadmium and ferronickel in the waste nickel to cadmium cell; wherein, the cadmium recycle ratio with the high efficiency cadmium recycle technology can reach 99.8 percent, and the cadmium purity is more than 99.9 percent. Metal cadmium is completely recycled, thus the waste is fully used and no secondary pollution is formed and considerable economic benefit and good social ...

Method for recycling manganese ion in electrolytic manganese production tail end wastewater

The invention provides a method for automatically recycling manganese ions in electrolytic manganese production tail end wastewater, which comprises the following steps of: pretreating stabilized production wastewater and carrying out ion exchange with cation exchange resin; adsorbing till the cation exchange resin is saturated and then adopting H2SO4 with the concentration of 0.5-1.5mol/L as a regenerant; and carrying out desorbing regeneration on the ion exchange resin adsorbed with Mn<2+>. The regenerated regenerating liquid forms MnSO4 with high concentration and meets the requirement of being recycled to the liquid preparation working section of electrolytic manganese production, and regenerating liquid with low concentration is recycled for regenerating operation in next batch. By utilizing the method, after the electrolytic manganese production tail end wastewater is processed, the discharge water is colorless and transparent and the manganese ion concentration approaches zero and ...

Method for removing sulfur-dioxide in smoke by bamboo-carbon filler biological drip filtering tower

Set technique for extracting cadmium from waste and old nickel-cadmium battery, and producing ferro-nickel alloy

The invention discloses a complete set of technique which can extract cadmium and produce ferronickel alloy from waste nickel to cadmium cell. The invention crushes the waste nickel to cadmium cell and then put the waste nickel to cadmium cell into a low temperature roasting kiln to carry out preroast, and the roasted materials and the reducing agent are mixed to conduct vacuum distillation to collect the product of cooling section and after refining, excellent cadmium is produced; the materials that are not vaporized can produce ferronickel alloy after being refined. The technique realizes the separation and exaction of cadmium and ferronickel in the waste nickel to cadmium cell; wherein, the cadmium recycle ratio with the high efficiency cadmium recycle technology can reach 99.8 percent, and the cadmium purity is more than 99.9 percent. Metal cadmium is completely recycled, thus the waste is fully used and no secondary pollution is formed and considerable economic benefit and good social ...