51results about How to "High arsenic removal efficiency" patented technology

The invention relates to a normal temperature dearsenifying agent, which consists of active components and a carrier, wherein the carrier is clay; and the active components comprise manganese dioxide and ferric oxide. Particularly, the dearsenifying agent consists of the following components in percentage by weight: 20 to 55 weight percent of manganese dioxide, 10 to 45 weight percent of ferric oxide, and 10 to 35 weight percent of the carrier. Based on the dearsenifying agent, the invention further discloses a method for preparing the dearsenifying agent, and the dearsenifying agent prepared by the method has higher arsenic capacity.

The invention provides a preparation method for an amorphous FeOOH water-purifying agent. The preparation method comprises the following steps: preparing a ferrous sulfate solution from industrial ferrous sulfate heptahydrate; adding a proper amount of sulfuric acid into the ferrous sulfate solution so as to provide an acidic environment; adding hydrogen peroxide into the solution and allowing ferrous sulfate to be oxidized into ferric sulfate under the condition of hydrolysis promotion by sulfuric acid; subjecting an industrial alkali source and the ferric sulfate solution to a precipitation reaction so as to produce iron hydroxide colloid; and dehydrating the iron hydroxide colloid under proper conditions so as to prepare the amorphous FeOOH water-purifying agent. The amorphous FeOOH water-purifying agent can effectively arsenic in water, has arsenic removal efficiency of 98% or above, does not contain aluminum ions or pose secondary pollution to a water body; after arsenic removal with the water-purifying agent, scorodite stably existing in the nature is produced, so pollution is not posed to the environment; moreover, raw materials used in the invention are of an industrial grade, and the preparation method is low in production cost and simple to operate.

The invention discloses a method for treating wastewater containing trivalent arsenic by utilizing microorganisms. The method comprises the following steps: adding ferrous salt into wastewater to be treated which contains the trivalent arsenic; meanwhile, adding iron-oxidizing bacteria which stays at a growth logarithmic period; adjusting the pH (Potential of Hydrogen) to be 1.6 to 2.8; controlling the temperature to be 25 DEG C to 30 DEG C; uniformly stirring and reacting for 3d to 5d; standing and precipitating the trivalent arsenic in a form of tooeleite; filtering and finishing treatment. A microorganism oxidization method disclosed by the invention can be used for treating the arsenic-containing wastewater with the arsenic content of 3.56g/L to 7.57g/L and adjusting the pH to be 1.6 to 2.8; at room temprature of 25 DEG C to 30 DEG C, the removal rate of the trivalent arsenic within 3d to 4d can reach about 98 percent; the method has the advantages that the raw materials are easy to obtain, the operation is simple and the treatment cost is low; obtained sediment is easy to separate and the arsenic content is high; the stability is good and no secondary pollution is caused.

The invention discloses a short-flow method for preparing antimony or bismuth hydrolysis mother solution and a composite cleaning agent for the short-flow method. The short-flow method comprises a chlorinated acid leaching step and a composite restoring purification step; and the obtained qualified hydrolysis mother solution can be hydrolyzed, converted and washed to obtain high-purity diantimony trioxide (or bismuth trioxide). The short-flow method comprises the following specific steps of: firstly, carrying out chlorinated acid leaching on antimony sulfide ore concentrate (or bismuth sulfide ore concentrate); secondly, carrying out composite restoring purification on leachate; and filtering the composite restoring purification liquid to obtain antimony (or bismuth) hydrolysis mother solution, wherein main impurity metals of the mother solution comprise Pb<2+> of which the concentration can be smaller than 50mg/L, As<3+> of which the concentration is smaller than 30mg/L and the S<2-> of which the concentration can be smaller than 50mg/L. The quality of the obtained hydrolysis mother solution can completely meet the requirement of preparing special high-grade and high-purity diantimony trioxide (or bismuth trioxide) by hydrolysis. Compared with a traditional method, the short-flow method has the advantages that the flow is greatly shorten and the production period is shorten by over one third; the whiteness of a high-purity diantimony trioxide (or bismuth trioxide) product obtained by the hydrolysis mother solution can stably reach over 92 percent. The contents of iron, arsenic and aluminum impurities in the product are below 10ppm. A novel process has the remarkable advantages of strong adaptability of raw materials, short process flow, fewer process control points, stable quality of products and the like.

The invention relates to a method for co-processing arsenic sulfide slag and arsenic-containing smoke in copper smelting. The method comprises the following steps that copper, zinc, iron, arsenic and like enter a solution through normal-pressure acid leaching of arsenic-containing smoke, lead is recovered from leaching slag through a lead smelting system, copper in smoke acid leaching liquid is precipitated through sulfuration of the arsenic sulfide slag, ferrous sulfate is added into the solution after copper precipitation, high-stability scorodite is obtained through reaction under the condition of oxygen pressure, the loss of valuable metal in the arsenic precipitation process is small, and the arsenic-removed solution with few impurities can be directly fed to a zinc electrodeposition process to obtain electrodeposited zinc or evaporated and crystallized to obtain a zinc sulfate product. According to the method, the valuable metal recovery rate is high, operation is easy, the problems that the arsenic sulfide slag is low in value and difficult to treat are effectively solved through arsenic sulfide slag sulfuration copper precipitation, and efficient utilization of dangerous solid waste and harmless treatment of arsenic are achieved.

The invention relates to a process method for removing arsenic from feed-grade calcium hydrogen phosphate prepared from wet-process phosphoric acid. The process method comprises the following steps of: 1) adding a sodium sulfide or calcium sulfide solution into neutralized slurry by using an adjustable pressure metering pump until the solution reaches a position which is 50cm away from the liquid level of the neutralized slurry; 2) desulfurizing by an air stripping method, namely removing hydrogen sulfide (H2S) from slurry at the bottom of a thickener by using a desorption tower; 3) recovering the H2S in tail gas to generate a mixed solution of calcium sulfide and sodium sulfide by using lime water and liquid caustic soda in a molecular ratio of Ca(OH)2 to NaOH of 1:1 as washing water of a tail gas washing tower, wherein the washing water of the tail gas washing tower is used as a raw material of an arsenic remover for the neutralized slurry in a section I and recycled after the concentration of the washing water is qualified; and 4) adding the sodium sulfide or calcium sulfide solution into the last one or two reaction tanks for one-stage neutralization of the wet-process phosphoric acid. The process method has the advantages that the content of the H2S in the slurry is reduced to about 3ppm, and the slurry does not have the odor of the H2S; and arsenic removal cost is reduced by more than half compared with that of a treatment method in which lime is not used.

The invention provides an arsenic-containing wastewater treatment method which comprises the following steps: adding an oxidizing agent into arsenic-containing wastewater, stirring for reaction, filtering after the reaction is completed, removing filter residues, and carrying out subsequent treatment on filtrate, pouring the filtrate into a microwave reactor, starting microwaves, heating, then slowly dropwise adding ferric salt, carrying out an arsenic precipitation reaction under the condition that the pH value is 2-3, carrying out heat preservation and aging after the reaction is completed, and then filtering to obtain a low-arsenic wastewater solution and filter residues which are scorodite; and firstly adding a neutralizer into a low-arsenic wastewater solution to adjust the pH value, then adding ferric salt to deeply remove residual arsenic in the low-arsenic wastewater, and filtering to obtain filtrate, namely arsenic-removed wastewater. According to the treatment method disclosed by the invention, the arsenic-containing wastewater is treated by microwave assistance, so that the wastewater treatment efficiency is effectively improved, the consumption of ferric salt in the subsequent deep arsenic removal process is effectively reduced, and the hazardous waste amount is reduced and the cost is further reduced.

The invention discloses an arsenic removal film for treating arsenic-containing wastewater in a mine. The arsenic removal film is prepared from the following raw materials: bamboo pulp fiber, glass fiber and eggshell powder, and the bamboo pulp fiber is mixed with the glass fiber and then wet process paper technology is used for papermaking the arsenic removal film, and the bamboo pulp fiber and the glass fiber are evenly spread out in a crisscross pattern. The bamboo pulp fiber, the glass fiber and the egg shell powder of the arsenic removal film has multiple functions, and the film made by the three has a very good separation and purification effect on arsenic in the arsenic-containing wastewater in the mine, and greatly improves the efficiency of arsenic removal. .

The invention provides an arsenic removal method for a rural well in a high-arsenic underground water region. The arsenic removal method comprises the following steps: filling a plurality of filter screen bags with cement balls loaded with nano-scale ion and manganese oxides on the surface taken as a particle filter material, and connecting the filter screen bags in a head-to-tail end so as to form a wave-shaped long strip arsenic removal belt, and arranging the long strip arsenic removal belt in water of the well in a suspended manner so as to remove arsenic in water. The method is designed according to the characteristics of a water supply method for the rural well in the high-arsenic underground water region, and the arsenic removal effect of high-arsenic underground water is good; moreover, raw materials are low in cost and are easily available, the technical requirements are simple, the checking and the maintenance are convenient, the administrative and management costs are low, external electric power or other energy supply facility is not needed, and the method is extremely suitable for being popularized and used in the rural well in the high-arsenic underground water region.

The invention discloses an arsenic removing method of iron ore. The method comprises the following steps that 1) ore pulp is prepared; 2) biological arsenic removing is performed; 3) grinding is performed; 4) oxidizing roasting is performed, specifically, a mixture C obtained in the step 3) is subjected to oxidizing roasting under the weak oxidization atmosphere, the mixture C is constantly stirred in the oxidizing roasting process, flowing carrier gas is introduced and used for expelling a produced gas D, and a solid matter obtained after oxidizing roasting is completed is arsenic-removed iron ore; and 5) recovery is cycled. The method has a remarkable arsenic removing effect on the arsenic-contained iron ore, through mutual cooperation of biological arsenic removing and gasification arsenic removing, and the arsenic removing efficiency is effectively improved; and meanwhile, the produced gasification arsenic removing products are subjected to recovery and recycling treatment, environmental pollution to the environment is reduced, environment pollution is small, and comprehensive utilization of arsenic-contained ore resources can be achieved easily.

The invention discloses a method for resource utilization and innocent treatment of etching waste liquid containing copper in the circuit board industry. The method comprises the following steps of: pre-treating acid etching waste liquid containing the copper and alkali etching waste liquid containing the copper; performing a neutralization reaction of the pre-treated etching waste liquid to generate copper sulphate and basic copper chloride, recovering the copper from remaining wastewater containing low-concentration copper through absorption by adopting an ion exchange technology after mostcopper is recovered, and obtaining a regenerated copper chloride raw material after resin desorption; and evaporating remaining copper-free wastewater, i.e. ammonia nitrogen wastewater, by using a multi-effect evaporator to recover an ammonium chloride product which can be used as a regenerated etching liquid, and discharging the remaining wastewater up to the standard. By the method, the pollution problem of heavy metal ions to the environment is solved, and cyclic utilization of the waste liquid for production of other products can be realized, so the resources are saved and the environmentis protected.

The invention discloses an arsenic removal method for preparing a biological adsorbent from traditional Chinese medicine waste residues, which comprises the following steps: washing the traditional Chinese medicine waste residues, performing drying in an oven, taking the traditional Chinese medicine waste residues out, performing pulverizing and screening to obtain waste residue powder; adding theobtained waste residue powder into a FeCl3 solution, performing stirring to react, and performing filtering, cleaning and drying to obtain a biological adsorbent; and adding the obtained biological adsorbent into arsenic-containing waste liquid to be treated, and stirring for reaction to remove arsenic. According to the method, traditional Chinese medicine waste residues obtained after a pharmaceutical process in the traditional Chinese medicine industry is finished are subjected to physicochemical treatment and then modified to obtain the biomass adsorption material, the biomass adsorption material reacts with low-concentration arsenic-containing wastewater, the final arsenic removal efficiency can reach 98%, and compared with other methods, the method is low in cost, raw materials are easy to obtain, the process is simple, and the removal efficiency is high.

The invention discloses a catalytic cracking gasoline adsorption dearsenification catalyst with large specific surface area, hierarchical pore distribution and high dearsenification performance and a preparation method thereof, and the method comprises the following steps: 1) mixing active carbon and pseudo-boehmite in proportion, grinding, stirring, adding a pore-enlarging agent and an acid solution, extruding into strips, drying, and roasting under an anaerobic condition to prepare a carbon-alumina composite carrier; (2) adjusting the pH value of the metal precursor solution, and impregnating the solution containing the active metal precursor into the carrier by adopting an isovolumetric saturated impregnation method; and 3) drying the catalyst, and roasting in an oxygen-free environment to obtain the finished product catalyst. The carrier with a composite pore channel structure can improve diffusion, reaction and escape of reactant molecules in pore channels, and the reaction efficiency is improved; metal with partially filled d tracks is selected as active metal, so that the acting force between the arsenide and the metal can be improved, and the arsenide is deeply removed; the pH value of the metal precursor solution is adjusted to be higher than the isoelectric point of the metal oxide or hydroxide, the acting force between the metal and the carrier can be weakened, the dispersity of the metal is improved, and finally the arsenic removal efficiency of the catalyst is improved.

The invention relates to a method for adsorbing and removing arsenic by using an iron-manganese oxide/mesoporous silica adsorbent, and belongs to the technical field of heavy metal pollution treatment. The iron-manganese oxide/mesoporous silica adsorbent is prepared by taking mesoporous silica as a carrier and loading the iron-manganese oxide, the agglomeration effect of the iron-manganese oxide is reduced by adding the mesoporous silica, and the porosity and the corresponding arsenic removal efficiency of the adsorbent can be improved by taking the silica as the carrier and loading the iron-manganese oxide. The preparation method of the adsorbent is simple, the adsorption amount for an arsenic solution is large, the adsorption rate is high, and the adsorbent has a wide application prospect.