Method for preparing flower-like structure zinc oxide from low-and medium-grade zinc oxide ores

A technology of zinc oxide ore and flower-like structure is applied in the field of preparing flower-like structure zinc oxide powder, which can solve the problems of low product added value, many process links, low recovery rate, etc., and achieves good photocatalytic activity and broad application prospects. , the effect of high added value

Inactive Publication Date: 2018-12-18
NORTHEASTERN UNIV
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Problems solved by technology

[0009] In order to solve the above-mentioned problems in the prior art that there are many process links, high energy consumption, low recovery rate and low added value of products for the recovery of medium and low-grade zinc oxide ore, the present invention provides a method for preparing flower-shaped structure by using medium and low-grade zinc oxide ore. Zinc Oxide Method

Method used

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  • Method for preparing flower-like structure zinc oxide from low-and medium-grade zinc oxide ores
  • Method for preparing flower-like structure zinc oxide from low-and medium-grade zinc oxide ores
  • Method for preparing flower-like structure zinc oxide from low-and medium-grade zinc oxide ores

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Embodiment 1

[0101] This embodiment is to limit the specific implementation conditions of steps S2 to S6 in the above general implementation scheme, and the rest of the undefined parts are carried out by referring to the steps of the above general scheme. in:

[0102] In step S2, the amount of ammonium bisulfate added is 1.2 times of the theoretical amount of ammonium bisulfate required for the complete reaction of zinc, iron and aluminum in the zinc oxide ore;

[0103] In step S3, the roasting temperature is 475°C, and the roasting time is 60 minutes;

[0104] In step S4, the amount of water added is 4 times the mass of the roasted product, and stirred and dissolved at 80° C. for 50 minutes;

[0105] In step S5, during heavy iron treatment, add in the filtrate A1 and be used for oxidizing Fe 2+ hydrogen peroxide, and then slowly add ammonium bicarbonate, control the solution temperature to 95°C, control the solution pH to 1.5-2, react for 2.5 hours, adjust the solution pH to 3.8 after a...

Embodiment 2

[0108] This example is to limit the specific implementation conditions of steps S2 to S7 in the above overall implementation plan, and the rest of the undefined parts are carried out with reference to the steps of the above overall plan, wherein:

[0109] In step S2, the amount of ammonium bisulfate is 1.4 times the theoretical amount required to completely react the zinc, iron and aluminum in the zinc oxide ore;

[0110] In step S3, the calcination temperature is 450° C., and the calcination time is 90 minutes;

[0111] In step S4, the amount of water added is 4 times the mass of the roasted product, and stirred and dissolved at 80° C. for 60 minutes;

[0112] In step S5, during the heavy iron treatment, add to the filtrate A1 for oxidizing Fe 2+ hydrogen peroxide, and then slowly add ammonium bicarbonate, control the solution temperature to 95°C, control the solution pH to 1.5 to 2, react for 3.0 hours, adjust the solution pH to 3.8 after alum making, and filter to obtain j...

Embodiment 3

[0115] In this embodiment, only step S7 in embodiment 2 is changed on the basis of embodiment 2, wherein:

[0116] In step S7, the liquid is divided into B2 and OH-containing - The molar ratio of the solution is Zn 2+ :OH - =1:2, and add 5mL of PEG20000 solution with a mass percent concentration of 10% to the hydrothermal reaction kettle, react at 120°C for 6h, wash and dry the zinc oxide to obtain a flower-like zinc oxide composed of a sheet structure powder, such as Figure 4 As shown, it can be clearly seen from this figure that the present embodiment can indeed obtain a flower-like zinc oxide powder with a uniform structure and shape.

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Abstract

The invention relates to the technical field of hydrometallurgy, in particular to a method for preparing flower-like structure zinc oxide powder from low-and medium-grade zinc oxide ores. The method comprises grinding the low-and medium-grade zinc oxide ores, and mixing the low-and medium-grade zinc oxide ores with ammonium bisulfate evenly for roasting to obtain a roasted material, adding water for dissolving the roasted material, filtering the roasted material, using filter residue to extract valuable components such as lead, strontium and silicon, precipitating iron by an ammonium jarositemethod and precipitating aluminium by an aluminium hydroxide form to obtain a purified solution with the iron and the aluminium removed; mixing the purified solution with an alkali solution in a molarratio of Zn<2+>: OH<-> of 1:2-10, and placing the purified solution and the alkali solution in a hydrothermal reactor, and adding a PEG 20000 or SDBS solution with a mass concentration of 5-15% to the hydrothermal reactor, homogeneously stirring, reacting at 120-220 DEG C for 4-12 h, filtering, washing and drying to obtain the flower-like structure zinc oxide powder.

Description

technical field [0001] The invention relates to the technical field of preparing zinc oxide by a hydrothermal method, in particular to a method of preparing flower-shaped structure zinc oxide powder by utilizing middle and low-grade zinc oxide ore. Background technique [0002] The main components of zinc ore in nature are zinc sulfide ore and zinc oxide ore. How to effectively utilize middle and low grade zinc oxide ore is a worldwide problem. [0003] After years of development and utilization, zinc sulfide ore has been gradually exhausted, and it has been difficult to meet the needs of sustainable development of the zinc industry. Over the years, many countries have carried out a lot of research on the utilization of low- and medium-grade zinc oxide ore. my country has abundant zinc oxide ore resources. In Yunnan Province alone, there are several zinc oxide ores with reserves greater than 2 million tons. Among them, Lanping zinc oxide ore The reserves exceed 10 million t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00C01F7/14C01F7/34C01G9/02C01G49/02C01G49/14C21B15/00
CPCC01G9/02C01D5/00C01F7/142C01F7/34C01G49/02C01G49/14C01P2004/03C01P2004/45C21B15/00
Inventor 申晓毅邵鸿媚刘岩顾惠敏翟玉春
Owner NORTHEASTERN UNIV
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