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Filtering aid method for leaching and removing iron from zinc hypoxide

A secondary zinc oxide and leaching technology is applied in the field of filtration aid for leaching and removing iron from secondary zinc oxide, which can solve the problems of inability to filter or settle, unstable iron removal effect, and difficulty in filtration of iron removal slag, so as to ensure the smoothness of the process, Guarantee the effect of removing iron and improving the filtration speed

Active Publication Date: 2020-06-05
JIYUAN LUTAI NANO MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the development and application of mineral raw materials is becoming wider and wider, the grade of sub-zinc oxide is getting lower and lower. In the actual operation of this method, the iron removal slag of most raw materials is not only difficult to filter (filter press filter), but also very easy to filter. The phenomenon of running and filtering occurs, resulting in unstable iron removal effect. When the content of ferrous ions in the solution reaches a certain amount, it cannot even be filtered or settled

Method used

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  • Filtering aid method for leaching and removing iron from zinc hypoxide
  • Filtering aid method for leaching and removing iron from zinc hypoxide
  • Filtering aid method for leaching and removing iron from zinc hypoxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The raw material contains 51.63% zinc and 1.4% iron.

[0073]A. After putting 2.4 tons of zinc oxide into 9.7 tons of water to make slurry, after stirring for 10 minutes, add 2.2 tons of 98% concentrated sulfuric acid under stirring, and the detection temperature rises to 80°C. If the temperature is insufficient, the temperature of the reaction material is raised To 80°C, react for 60min, and detect pH=5.

[0074] B. Detection of [Fe in the zinc oxide leaching solution 2+ ]=3.18g / L, keeping the material at 80°C, according to Fe in zinc oxide leaching solution 2 + In terms of the weight of the substance reacting with hydrogen peroxide, the Fe participating in the reaction is added 2+ 2 times (60 kg) of 30wt% hydrogen peroxide, and kept stirring for 10min. According to the amount of hydrogen peroxide added, 4 kg of secondary zinc oxide, 8 kg of zinc carbonate, and 30 kg of stone powder were put into it in proportion as iron remover and filter aid, stirred for 10 minut...

Embodiment 2

[0077] The raw material contains 42.63% zinc and 3.3% iron.

[0078] A. Put 2.4 tons of zinc oxide into 9.8 tons of water to make slurry, stir for 10 minutes, add 1.8 tons of 98% concentrated sulfuric acid under stirring, and heat up the reaction materials to 80 ° C. If the temperature is insufficient, the reaction materials Raise the temperature to 80°C, react for 60 minutes, and detect pH=5.

[0079] B. Detection of [Fe in the zinc oxide leaching solution 2+ ]=7.73g / L, keeping the material at 80°C, according to Fe in zinc oxide leaching solution 2 + Based on the weight of the substance reacting with hydrogen peroxide, 120 kg of 30wt% hydrogen peroxide was added, and the stirring was continued for 10 minutes. According to the amount of hydrogen peroxide added, 6 kg of secondary zinc oxide, 12 kg of zinc carbonate, 40 kg of stone powder and 1.2 kg of soda ash were put into it in proportion as iron remover and filter aid, stirred for 10 minutes, and the pH was detected to be...

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Abstract

The invention provides a filtration aiding method for leaching and iron removal of zinc hypoxide, and belongs to the technical field of chemical engineering. A filtration aiding method comprises the following steps: adding at least two of zinc hypoxide, basic zinc carbonate and stone powder into a reaction system of zinc hypoxide leachate and hydrogen peroxide, reacting until the content of Fe<2+>does not exceed 0.2 [mu]g / mL, and then carrying out solid-liquid separation. According to the method, aiming at different grades of zinc hypoxide raw materials, the oxidation hydrolysis iron removaleffect can be improved, and aiming at different raw materials; through the process, the content of [Fe<2+>] in the leachate is less than or equal to 0.2 [mu]g / ml, and the content of ferrous ions in active nano zinc oxide with the content of 95% is within 2 ppm; the filtering speed of the neutral leaching slurry is greatly increased, and the filtering speed of the neutral leaching slurry can be increased by 100-300% for neutral leaching solutions with different ferrous ion contents; and the filter running phenomenon is eliminated, the iron removal effect is ensured, and the process fluency is ensured.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a filter aid method for leaching and removing iron by secondary zinc oxide. Background technique [0002] At present, active nano zinc oxide is widely used in desulfurizer, rubber, ceramics, medical treatment, photocatalysis, cosmetics, feed and other industries. Active nano-zinc oxide prepared by wet method has excellent surface activity and has become the main raw material of zinc oxide desulfurizer. In the wet process, secondary zinc oxide is used as raw material, and various purification measures including iron removal are required during the production process. The iron content in the active nano-zinc oxide product is one of the main factors affecting the molding of the zinc oxide desulfurizer production process and the crush resistance and wear rate of the desulfurizer product. There are even other downstream industries that require iron content below 5ppm, such...

Claims

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Application Information

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IPC IPC(8): C01G9/02B82Y40/00
CPCC01G9/02B82Y40/00C01P2006/80Y02P10/20
Inventor 齐磊王东王洋石磊
Owner JIYUAN LUTAI NANO MATERIAL CO LTD
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