50results about How to "High arsenic removal rate" patented technology

A process for preparing the de-arsenic agent includes such steps as preparing the filtered wet C-Cu cake from the aqueous solution of sodium carbonate and the aqueous solution of copper sulfate, proportionally mixing it with zinc carbonate, alumina and water, press filtering to obtain filtered wet cake, drying, pulverizing, calcining, grinding, mixing it with CMC solution and sodium metaluminate, stirring, extruding out, and calcining in rotary furnace.

The invention discloses an arsenic removal method in a nickel electrolysis mixed acid system. According to the method, the iron-arsenic ratio of anodic electrolyte is reasonably controlled through iron supplementation, and meanwhile, the temperature and pH value of an iron removal process are controlled, so that 80% or more of arsenic is separated out in an iron arsenate or adsorption form in the iron removal process; then, in the cobalt removal stage, the cobalt removal oxidation potential, reaction time and pre-cobalt-removal liquor pH value are controlled, and remaining arsenic in iron removal and arsenic removal filtered liquor is removed with cobaltous hydroxide at the cobalt removal stage in a coprecipitation manner. Besides, iron removal and arsenic removal filtered slag generated by purification and cobalt removal and arsenic removal filtered slag are subjected to nickel removal treatment and then filtered, filtered liquor returns to liquor making for treatment, part of arsenic is brought to the liquor making process, and arsenic removal is induced by controlling solution copper ions and electric current density in the liquor making process. By means of the method, the problem that arsenic contained in nickel electrolysis exceeds standards is well solved, the arsenic contained in electrolysis new liquor is smaller than 0.0002 g / l, the arsenic contained in electrolytic nickel is smaller than 0.0005%, and the arsenic removal rate in a solution of a whole system reaches 98% or above.

The present invention discloses a method for removing arsenic in apple juice. Astringent persimmon fruit powder is added into the apple juice to absorb arsenic. The used astringent persimmon fruit powder is made by beating the astringent persimmon fruits and vacuum freeze-drying the beat astringent persimmon fruits. The weight ratio of the astringent persimmon fruit powder to the apple juice is 1 : (100-400), the stirring time is controlled at 5-30 min, and the filtration removes the astringent persimmon fruit powder. The apple juice arsenic removing method is simple, the arsenic removal efficiency is high, the flavor and taste of the apple juice do not change after the removal of arsenic, and the method can be widely used in the production of apple juice.

The invention discloses a manufacturing method of refined high-purity yellow phosphor, which comprises the following steps: adding 20-30% yellow phosphor into 70-80% water in the sandwich insulating furnace; heating to fuse into liquid pattern; doping 8-15% carbonate; heating to 70-75 Deg C; stirring; washing through 75-80 Deg C; stewing; sedimenting; making arsenic content less than 0.2PPM and each impurity content less than 300PPM; refining to obtain 5-6N high-purity yellow phosphor.

The supported arsenic removal agent of the present invention includes a carrier and an active component loaded on the carrier; the carrier is porous amorphous magnesium aluminum spinel, and the active component is CuO and / or NiO. Since the carrier is porous amorphous magnesium-aluminum spinel with good crystallinity, the material is internally bound by strong Mg- and Al-O ionic bonds, which fundamentally effectively improves the strength and hydration resistance of the material. The preparation method of the load-type arsenic removal agent of the present invention has simple production process and low production cost.

The invention discloses a method for using silica gel to strengthen zinc residue to remove arsenic in polluted acid, and belongs to the technical field of heavy metal pollution control. The method of the invention is that the zinc slag is finely ground and sieved to obtain the zinc slag powder, and the zinc slag powder is mixed with the silica gel solution to obtain the arsenic remover; the arsenic remover and H 2 O 2 Add it into the arsenic-containing polluted acid and mix it evenly, use sodium hydroxide solution to control the pH of the solution to be 2-4, and react at a temperature of 80-90 ° C and stirring for 4-6 hours, and separate the solid-liquid to obtain iron arsenate as the core. , arsenic-rich slag and filtrate in the core-shell structure with silica gel as the shell, and the filtrate is subjected to deep arsenic removal treatment; 2 Strengthening the removal of arsenic from zinc slag not only improves the rate of arsenic removal, but also improves the stability of arsenic-containing precipitation, which is beneficial to stockpiling.

The invention discloses a pH value method for removing arsenicum from the acidic etching liquid of a printed circuit board. The pH value method comprises the steps of: adjusting the pH value of the waste acidic etching liquid to be treated of the printed circuit board to 2.0-3.0; settling flocculent: (1) taking 0.8-1.5kg of flocculating agent in terms of the waste acidic etching liquid to be treated per cubic meter of the printed circuit board, (2) diluting the flocculating agent with water, and stirring to prepare into a viscous solution, and (3) adding the flocculating agent solution into the waste acidic etching liquid subjected to pH value regulation, stirring for 3-20 min, and then standing for 3-6 h; filtering to remove precipitates to obtain the waste arsenicum-removed acidic etching liquid of the printed circuit board. According to the pH value method for removing the arsenicum in the invention, a pH value regulation method and a flocculent settling method are jointly used, the arsenicum removal treatment of the waste acidic etching liquid of the printed circuit board is realized under the condition of low cost, and the pH value method has the advantages of low treatment cost, simplicity in operation, small equipment investment and the like, and is suitable for the arsenicum removal treatment of a large amount of waste acidic etching liquid of the printed circuit board.