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Preparation method of nano-scale fine iron-zinc composite oxide material

A composite oxide, nano-scale technology, applied in the direction of iron compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as environmental pollution, loss of resource reuse value, environmental secondary pollution, etc., to reduce environmental pollution and The effect of the loss of precious metal resources

Inactive Publication Date: 2019-03-08
QINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, if the various organic substances and metal ions dissolved in the pickling waste liquid are discharged without treatment, it will cause serious pollution to the environment and endanger human health.
[0003] In the prior art, the treatment method for metal pickling waste liquid is usually to use lime dissolved in water to form calcium hydroxide, which reacts with metal ions in metal salts to form metal hydroxide precipitates and a large amount of calcium salt mixture, such Dissolved metal salts cannot be recycled, which will cause secondary pollution to the environment and lose the value of resource reuse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The treatment method of waste liquid (acid content is 30g / L, and total soluble metal ion content is 128g / L) produced by carbon steel pickling in iron tower factory comprises the steps:

[0025] 1) Pretreatment: filter the waste hydraulic pressure to remove solids and suspended solids in the waste liquid;

[0026] 2) Put 1) the pretreated waste liquid into the oxidation tank, and add 15w / w% hydrogen peroxide (according to the mass ratio of COD and hydrogen peroxide in the waste acid liquid is 1:2.5);

[0027] 3) Put 2) the waste acid solution that has been oxidized to remove organic matter into the sedimentation tank, add 30w / w% sodium hydroxide solution to make the solution weakly alkaline (pH=7.5), and obtain a composite metal hydroxide containing iron and zinc sediment (according to the mass ratio of waste waste acid solution and lye solution is 1:0.12);

[0028] 4) Precipitating and separating 3) metal hydroxide precipitates containing iron and zinc from the soluble...

Embodiment 2

[0033] The treatment method of waste liquid (acid content is 25g / L, and total soluble metal ion content is 100g / L) produced by pickling of hot-dip galvanized iron pipe comprises the steps:

[0034] 1) Pretreatment: filter the waste hydraulic pressure to remove solids and suspended solids in the waste liquid;

[0035] 2) Put the waste liquid after 1) pretreatment into the oxidation tank, and add 15w / w% hydrogen peroxide (according to the mass ratio of COD and hydrogen peroxide in the waste acid liquid is 1:2.5);

[0036] 3) Put 2) the waste acid solution that has been oxidized to remove organic matter into the sedimentation tank, add 30w / w% sodium hydroxide solution to make the solution weakly alkaline (pH=7.5), and obtain a composite metal hydroxide containing iron and zinc sediment (according to the mass ratio of waste waste acid solution and lye solution is 1:0.10);

[0037] 4) Precipitating and separating 3) metal hydroxide precipitates containing iron and zinc from the so...

Embodiment 3

[0042] The treatment method of waste liquid (acid content is 30g / L, and total soluble metal ion content is 128g / L) produced by carbon steel pickling in iron tower factory comprises the steps:

[0043] 1) Pretreatment: filter the waste hydraulic pressure to remove solids and suspended solids in the waste liquid;

[0044] 2) Put 1) the pretreated waste liquid into the oxidation tank, and add 15w / w% hydrogen peroxide (according to the mass ratio of COD and hydrogen peroxide in the waste acid liquid is 1:2.5);

[0045] 3) Put 2) the waste acid solution that has been oxidized to remove organic matter into the sedimentation tank, add 30w / w% sodium hydroxide solution to make the solution weakly alkaline (pH=7.5), and obtain a composite metal hydroxide containing iron and zinc sediment (according to the mass ratio of waste waste acid solution and lye solution is 1:0.12);

[0046] 4) Precipitating and separating 3) metal hydroxide precipitates containing iron and zinc from the soluble...

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PUM

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Abstract

The invention discloses a preparation method of a nano-scale fine iron-zinc composite oxide material. The preparation method comprises the following steps: removing organic matter according to the organic matter contained in a pickling waste liquid with an oxidation method, converting soluble metal ions into a precipitate (a metal hydroxide) according to the content contained in the pickling wasteliquid, separating and extracting the metal hydroxide from the original solution to obtain the metal hydroxide, removing water-soluble salt contained in the metal hydroxide (purifying the metal hydroxide), heating and decomposing the metal hydroxide into a metal oxide, heating and calcining the metal oxide to 800 to 1100 DEG C, then slowly cooling to room temperature after calcination, grinding the calcined metal oxide, sieving the ground metal oxide with a sieve of 2000-3000 mesh to ensure a particle size to be in the nanometer range, inspecting, and packaging to obtain the fine iron-zinc composite oxide material.

Description

technical field [0001] The invention belongs to the technical field of industrial waste liquid treatment, and also belongs to the technical field of industrial hazardous waste treatment and resource recycling, and relates to a preparation method of a nano-scale fine iron-zinc composite oxide material, in particular to a method for using metal pickling waste liquid A method for preparing nanoscale fine iron-zinc composite oxide materials from soluble metal ions in Background technique [0002] In the industrial metal products industry, in order to realize the cleaning of oxides, rust, and oil stains on the surface of metal products, acid cleaning is usually used to remove oxides and rust on the metal surface through a chemical reaction between the metal and the acid in the acid solution. After metal pickling, soluble metal salts and water are generated, but as the number of pickling increases, the acid in the acid solution decreases and the metal salts increase, and then lose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
CPCC01G49/0063
Inventor 石海信陆贻春冯晓东汪双双王荣健
Owner QINZHOU UNIV