Method for intensively leaching iron complex phase in zinc oxygen pressure slag

A technology of enhanced leaching and zinc oxide, applied in the direction of improving process efficiency, etc., can solve the problems of low iron recovery rate, difficult tail gas treatment, high roasting temperature, etc., and achieve the effects of low raw material cost, easy operation, and simple process flow

Pending Publication Date: 2021-07-16
有研资源环境技术研究院(北京)有限公司 +1
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Problems solved by technology

[0005] It is worth noting that the above-mentioned treatment processes have problems such as high calcination temperature resulting in high energy consumption, low iron recovery rate, and difficult tail gas treatment to varying degrees.

Method used

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  • Method for intensively leaching iron complex phase in zinc oxygen pressure slag
  • Method for intensively leaching iron complex phase in zinc oxygen pressure slag
  • Method for intensively leaching iron complex phase in zinc oxygen pressure slag

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Experimental program
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Effect test

Embodiment 1

[0020] process such as figure 1 As shown, 100 g of a zinc-oxygen pressed slag in Shaoguan, Guangdong (the results of the iron complex phase phase analysis are shown in Table 1) were ground to a particle size of -200 mesh to -400 mesh, and then mixed with 40 g of concentrated sulfuric acid (content 98%). The ingredients are mixed evenly, put into a muffle furnace for roasting, and the roasting temperature is controlled at 250° C., and the roasting time is 2 hours. After roasting, the obtained material was added to sulfuric acid solution (concentration ~ 10wt%), the solid-to-liquid ratio (g / mL) was 1:4, stirred at 90°C for 1 hour, and then filtered to obtain a filtrate containing iron. The obtained filtrates were respectively transferred to volumetric flasks for constant volume, and the content of iron element in them was detected. In addition, the iron element in the filter residue also needs to be detected.

[0021] After calculation, the leaching rate of iron is 81.16%.

[...

Embodiment 2

[0025] Grind 100g of a zinc-oxygen pressed slag in Shaoguan, Guangdong (the results of the iron complex phase phase analysis are shown in Table 1) to a particle size of -200 mesh to -400 mesh, and mix it with 30g of concentrated sulfuric acid (98% content) and 10g of zinc sulfate Prepare ingredients and mix them evenly, put them into a muffle furnace for roasting, control the roasting temperature to 260° C., and roast for 2 hours. After roasting, the obtained material was added to sulfuric acid solution (concentration ~ 10wt%), the solid-to-liquid ratio (g / mL) was 1:5, stirred at 90°C for 1 hour, and then filtered to obtain a filtrate containing iron. The obtained filtrates were respectively transferred to volumetric flasks for constant volume, and the content of iron element in them was detected. In addition, the iron element in the filter residue also needs to be detected.

[0026] After calculation, the leaching rate of iron is 83.81%.

Embodiment 3

[0028] Grind 100g of zinc-oxygen compressed slag (the results of iron complex phase phase analysis are shown in Table 1) in Shaoguan, Guangdong to a particle size of -200 mesh to -400 mesh, and mix it with 50g of concentrated sulfuric acid (content 98%) and 20g of sodium sulfate Prepare ingredients and mix them uniformly, put them into a muffle furnace for roasting, control the roasting temperature to 270° C., and roast for 3 hours. After roasting, the obtained material was added to sulfuric acid solution (concentration ~ 10wt%), the solid-to-liquid ratio (g / mL) was 1:5, stirred at 90°C for 1.5h and then filtered to obtain a filtrate containing iron. The obtained filtrates were respectively transferred to volumetric flasks for constant volume, and the content of iron element in them was detected. In addition, the iron element in the filter residue also needs to be detected.

[0029] After calculation, the leaching rate of iron is 85.52%.

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Abstract

The invention discloses a method for intensively leaching an iron complex phase in zinc oxygen pressure slag. The method comprises the following steps: grinding zinc oxygen pressure slag, and carrying out proportioning according to the mass ratio of the zinc oxygen pressure slag to concentrated sulfuric acid to sulfate being 1:(0.1-2):(0-1.0); uniformly mixing the ingredients, and carrying out roasting at 200-400 DEG C for 0.5-5 hours; and leaching roasted materials through a sulfuric acid solution at the temperature of 30-100 DEG C, wherein the concentration of the sulfuric acid solution is 0-10 wt%, the solid-to-liquid ratio (g / mL) is 1:4-1:10, and the leaching time is 0.5-4 h; and carrying out filtering, and entering an iron element into the solution. According to the method, the iron complex phase in zinc oxygen pressure can be intensively leached, the leaching rate of iron is larger than or equal to 80%, and the method has the advantages of being high in recovery rate, easy and convenient to operate, low in energy consumption and the like.

Description

technical field [0001] The invention relates to the decomposition and extraction of iron complex phases in zinc-oxygen pressed slag, in particular, the invention relates to a method for intensified leaching of iron complex phases in zinc-oxygen pressed slag. Background technique [0002] Oxygen pressure leaching process of zinc sulfide concentrate, the main process is to use an autoclave at a certain temperature (140-160°C) and feed oxygen under pressure to directly carry out sulfuric acid leaching of zinc sulfide concentrate. In this process, zinc sulfide is transformed into into zinc sulfate and sulfur. After the oxygen pressure leaching feed solution after the reaction is filtered, the zinc sulfate enters the solution, and then the solution is processed, and the steps such as purification, impurity removal, and electrowinning can produce electrolytic zinc. After the leaching residue is flotation, the sulfur and oxygen pressure leaching residue is obtained. [0003] Duri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/06C22B7/00
CPCC22B1/06C22B7/007Y02P10/20
Inventor 高文成温建康蔡镠璐
Owner 有研资源环境技术研究院(北京)有限公司
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