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A method for extracting arsenic from arsenic-containing nickel-cobalt slag and preparing arsenate

A technology of nickel-cobalt slag and arsenate, which is applied in the direction of arsenate/arsenite, chemical instruments and methods, arsenic compounds, etc., can solve the problems of high energy consumption, increased equipment investment costs, high energy consumption, etc., and achieve The effect of high leaching rate, low cost, low energy consumption and low cost

Active Publication Date: 2020-06-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent is carried out in an autoclave, which has the problem of high energy consumption for industrial production, and will also increase equipment investment costs
Chinese invention patent CN201310421661.7 is an improvement on the previous patent by adding copper oxide as an oxidant, and the temperature is controlled at ≤300°C, which also has the problem of high energy consumption.

Method used

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  • A method for extracting arsenic from arsenic-containing nickel-cobalt slag and preparing arsenate
  • A method for extracting arsenic from arsenic-containing nickel-cobalt slag and preparing arsenate
  • A method for extracting arsenic from arsenic-containing nickel-cobalt slag and preparing arsenate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Add 60g of arsenic-containing nickel-cobalt slag material with a particle size of 1 μm to 300mL of 5M NaOH solution to form a mixed slurry, place the mixed slurry in a reactor, and heat the reactor in a water bath at 85°C; The bottom is provided with an intake ring pipe with a circumference of 15 cm. Six air holes are evenly distributed on the air intake ring pipe with a diameter of 3 mm. The air holes on the air intake ring pipe on the same cross-section are in the same shape as the horizontal plane of the bottom of the reaction vessel. 45°, the air is introduced into the reactor from the air hole, the flow rate of the air is 3.5L / min, and the stirring reaction is carried out at the speed of 250r / min by a paddle stirrer for 8 hours to realize the removal of arsenic-containing nickel-cobalt slag Oxidative alkali leaching; the obtained solid phase is copper-nickel-cobalt-enriched slag, and the liquid phase is zinc-arsenic-rich leaching solution. The main components of the...

Embodiment 2

[0065] Add 60 g of arsenic-containing nickel-cobalt slag materials with a particle size of 40 μm to 300 mL of 5M NaOH solution to form a mixed slurry, place the mixed slurry in a reactor, and heat the reactor in a water bath at 80 ° C; The bottom is provided with an intake ring pipe with a circumference of 15 cm. Six air holes are evenly distributed on the air intake ring pipe with a diameter of 3 mm. The air holes on the air intake ring pipe on the same cross-section are in the same shape as the horizontal plane of the bottom of the reaction vessel. 45°, the air is introduced into the reactor from the vent hole, and the flow rate of the air is 3.5L / min. Oxidative alkali leaching; the obtained solid phase is copper-nickel-cobalt-enriched slag, and the liquid phase is zinc-arsenic-rich leaching solution. The main components of the leaching solution are sodium arsenate and sodium zincate. The arsenic-containing leaching solution is evaporated and crystallized to obtain arsenic ac...

Embodiment 3

[0067] Add 60 g of arsenic-containing nickel-cobalt slag materials with a particle size of 40 μm to 300 mL of 5M NaOH solution to form a mixed slurry, place the mixed slurry in a reactor, and heat the reactor in a water bath at 85 ° C; The bottom is provided with an intake ring pipe with a circumference of 15 cm. Six air holes are evenly distributed on the air intake ring pipe with a diameter of 3 mm. The air holes on the air intake ring pipe on the same cross-section are in the same shape as the horizontal plane of the bottom of the reaction vessel. 45°, the air is introduced into the reactor from the air hole, the flow rate of the air is 3.5L / min, and the stirring reaction is carried out at the speed of 250r / min by a paddle stirrer for 8 hours to realize the removal of arsenic-containing nickel-cobalt slag Oxidative alkali leaching; the obtained solid phase is copper-nickel-cobalt-enriched slag, and the liquid phase is zinc-arsenic-rich leaching solution. The main components ...

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Abstract

The invention discloses a method for extracting arsenic from arsenic-containing cobalt-nickel slag and preparing arsenate. The method comprises the following steps: adding the arsenic-containing cobalt-nickel slag to aqueous alkali in a reactor to obtain slurry, introducing a gas oxidizing agent from the bottom of the slurry, and performing normal-pressure oxidation under stirring; performing solid-liquid separation to obtain filter residues and a arsenic-containing filtrate, and performing evaporative crystallization on the arsenic-containing filtrate to obtain arsenate crystals. Under the cooperative work of a stirring way, stirring speed, gas flow and a gas introducing way during oxidizing alkaline leaching, a reaction mechanism of total blending in a bath is realized. Oxidizing leaching of the arsenic-containing cobalt-nickel slag is performed by adopting cheap raw gas oxidizing agent such as air with an alkaline process, , efficient leaching can be realized under normal pressure and low temperature, technical production difficulty and technical production cost are reduced remarkably, and the method has great industrialization significance.

Description

technical field [0001] The invention relates to the technical field of arsenic-containing nickel-cobalt slag treatment, in particular to a method for extracting arsenic from arsenic-containing nickel-cobalt slag and preparing arsenate. Background technique [0002] Arsenic is a metalloid element widely distributed in nature and an essential element for the human body. Arsenic oxides and their compounds are toxic and harmful to the human body. Arsenic can enter the human body through drinking water and food, and can also enter the human body through the respiratory tract, skin and mucous membranes, etc., causing lesions in the human digestive system, nervous system, immune system, and skin. Long-term exposure to arsenic-containing environments can cause cancer. A zinc smelter uses arsenic salts to remove cobalt and needs to consume a large amount of diarsenic trioxide every day to form alloys such as arsenic-copper and arsenic-nickel. These cobalt-removing waste residues cann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G28/02C22B7/00C22B30/04
CPCC01G28/02C01G28/023C22B7/008C22B30/04Y02P10/20
Inventor 陈爱良乔晋玺龙双钱振苗华磊赵中伟陈敬阳孙新涛邱洋
Owner CENT SOUTH UNIV
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