A method for saving energy and recycling hazardous waste containing iron and aluminum

A hazardous waste and energy-consumption technology, applied in the direction of protective devices against harmful chemicals, etc., can solve the problems of resin/extractant pollution, failure to separate iron, aluminum and heavy metals, high impurity content, etc., and achieve obvious solid-liquid separation , save usage, reduce the effect of reaction temperature

Active Publication Date: 2022-06-17
元素贵稀吉林省环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) When organic substances containing dithioformic acid groups are used as ligands to prepare resins or extractants for the recovery of heavy metals, there is a phenomenon that iron / aluminum is adsorbed or extracted at the same time, causing resin / extractant pollution, and recovery of heavy metals The impurity content in the medium is higher than 2%
Under such phosphorus removal conditions, the removal of heavy metal ions is relatively common, and the purpose of separating iron, aluminum and heavy metals cannot be achieved.

Method used

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  • A method for saving energy and recycling hazardous waste containing iron and aluminum
  • A method for saving energy and recycling hazardous waste containing iron and aluminum
  • A method for saving energy and recycling hazardous waste containing iron and aluminum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0151] Example 1 Removal of iron and aluminum impurities in zinc-containing electroplating waste sludge

[0152] (1) Dissolve 20 g of zinc-containing electroplating waste sludge in 100 mL of a solution containing 2M nitric acid and 2M hydrochloric acid, heat at 80°C, and stir at 80rpm.

[0153](2) Add citric acid to the mixed acid solution in step (1), and the amount of citric acid added is 1 mL of citric acid every 30 times, until the gelatinous substance disappears completely, and the stirring system rotates evenly. After stirring for 2h, pass through a 1mm sieve, and collect the slurry under the sieve.

[0154] (3) Add 100 mL of a solution containing 2M nitric acid and 2M hydrochloric acid to the slurry obtained in step (2), continue to stir for 12h, then pass through a 0.45-micron filter cloth, collect the filtrate, and use NaOH to adjust the pH of the filtrate to 0.18, at this time The concentrations of iron, aluminum and zinc in the filtrate were 10.1, 3.2 and 3.2 g / L, ...

Embodiment 2

[0160] Embodiment 2 Removal of iron and aluminum impurities in strontium-containing waste residue

[0161] (1) Dissolve 20g of strontium-containing waste residue in 100mL of 4M hydrochloric acid solution, heat at 80°C, stir at 80rpm, and stir for 2h, no suspension is formed;

[0162] (2) Pass the mixture of step (1) through a 1mm sieve, and collect the slurry under the sieve. Add 100mL of 4M hydrochloric acid solution to the slurry, continue stirring for 12h, then pass through a 0.45-micron filter cloth to collect the filtrate, and use NaOH to adjust the pH of the filtrate to 0.18. At this time, the concentrations of iron, aluminum and strontium in the filtrate are 5.4 and 8.2, respectively. and 1.7g / L.

[0163] (3) Take 20 mL of the filtrate in step (2), heat it to 60° C. in a water bath, and add sodium dihydrogen phosphate. When the amount added is 1.0 g, the hydrodynamic radius is 0.62 microns by sampling and measuring. To the remaining solution, 9.0 g of sodium dihydroge...

experiment example 1

[0206] Experimental Example 1 Concentration determination of iron and aluminum impurities in zinc-containing electroplating waste sludge

[0207] The determination of iron, aluminum and zinc concentrations in the supernatant was carried out for Example 1 and Comparative Examples 1 to 5 respectively, and the test results were shown in Table 1.

[0208] It can be seen from Table 1 that the content of iron and aluminum in Comparative Example 1 and Comparative Example 2 is much higher than that in Example 1, indicating that the method of directly adjusting the pH of the solution with alkali and trying to remove impurities through the difference in pH of metal precipitation is effective. not good.

[0209] Further, according to Comparative Example 1 and Comparative Example 2, it can be seen that with the increase of pH, the metal is gradually precipitated, and the content of iron and aluminum in the supernatant is significantly reduced.

[0210] It can be seen from Example 1 and C...

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Abstract

The invention relates to a method for saving energy and recycling hazardous wastes containing iron and aluminum. The method gradually controls the pH value to promote the precipitation of phosphoric acid-hydroxides of iron and aluminum, which can separate iron and aluminum at low temperature and high efficiency, and is applied to nonferrous metals The removal of high-concentration iron and aluminum in hazardous metal waste has achieved good results in iron and aluminum removal and non-ferrous metal recovery, with low reaction temperature, short time, controllable process, high purity of by-products and low content of non-ferrous metals, and iron and aluminum impurities in the final product The effect of low content.

Description

technical field [0001] The invention relates to a method for saving energy consumption and recycling iron and aluminum hazardous waste, in particular to the removal of iron and aluminum in metal waste slag controlled by the state, in particular to a method for removing iron and aluminum in non-ferrous metal waste slag. Background technique [0002] Non-ferrous metal waste slag is the waste slag produced by non-ferrous metal minerals in the smelting process. It is a kind of metallurgical waste slag and is one of the key hazardous wastes controlled by the state. It generally contains Zn, Cu, Cr, Ni, Mn and other non-ferrous metal ion impurities including but Fe, Al, Si, etc. are not limited to be contained. [0003] In the previous research, we dissolved strontium-containing waste residue, manganese-containing waste residue, and electroplating waste sludge in strong acid, and carried out laboratory-scale, pilot-scale and industrial-scale applications of iron and aluminum remov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/30A62D101/43A62D101/40
CPCA62D3/30A62D2101/43A62D2101/40A62D2203/02
Inventor 陈瑜王亚君王泊民王碧文
Owner 元素贵稀吉林省环境科技有限公司
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