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A method for removing residual heavy metal ions in the process of extracting potassium salt from dedusting dust

A technology of heavy metal ions and potassium salts, applied in the field of metallurgical industry production, can solve the problems of inability to completely precipitate and remove heavy metal ions in dust removal dust, and achieve the effects of high social and economic benefits, simple process flow and high treatment efficiency

Active Publication Date: 2018-02-02
山东星苑锌业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for removing residual heavy metal ions in the process of extracting potassium salt from dedusting ash, so as to solve the problem that the heavy metal ions in the leachate of dedusting ash cannot be completely precipitated and removed in the prior art

Method used

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  • A method for removing residual heavy metal ions in the process of extracting potassium salt from dedusting dust
  • A method for removing residual heavy metal ions in the process of extracting potassium salt from dedusting dust
  • A method for removing residual heavy metal ions in the process of extracting potassium salt from dedusting dust

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Embodiment 1

[0031] A method for removing residual heavy metal ions in the process of extracting potassium salt from dedusting ash, the method for removing heavy metal ions comprises the following steps:

[0032] (1) Mix and stir the dedusting ash and water according to the mass ratio of 1:2 for leaching for 2 hours to obtain the leaching solution;

[0033] (2) sending the leachate obtained in step (1) into a filter device to filter to obtain a filtrate;

[0034] (3) in step (2) gained filtrate, add sodium carbonate and carry out precipitation to remove impurity, sodium carbonate add-on is copper, lead, zinc all heavy metal ions in the solution combine with carbonate radical to generate 90% of the required molar weight of precipitation, to be precipitated After it is complete, it is sent to the filter equipment for filtration, and the filtered clear liquid is collected;

[0035] (4) Heat the clear liquid obtained in step (3) to 95°C, then slowly add soybean milk and stir, the carboxyl gro...

Embodiment 2

[0040] A method for removing residual heavy metal ions in the process of extracting potassium salt from dedusting ash, the method for removing heavy metal ions comprises the following steps:

[0041] (1) The dedusting ash and water are mixed and stirred for leaching in a mass ratio of 1:2.5, and leached for 2 hours to obtain a leaching solution;

[0042] (2) sending the leachate obtained in step (1) into a filter device to filter to obtain a filtrate;

[0043] (3) add sodium sulfide in step (2) gained filtrate and carry out precipitation to remove impurity, sodium sulfide add-on is all heavy metal ions of copper, lead, zinc in the solution and S 2- Combined with 95% of the molar amount required to generate the precipitate, after the precipitation is complete, send it to the filter equipment for filtration, and collect the filtered clear liquid;

[0044] (4) Heat the clear liquid obtained in step (3) to 92°C, then slowly add milk and stir, the carboxyl groups on the milk and t...

Embodiment 3

[0049] A method for removing residual heavy metal ions in the process of extracting potassium salt from dedusting ash, the method for removing heavy metal ions comprises the following steps:

[0050] (1) Mix and stir the dedusting ash and water according to the mass ratio of 1:4 for leaching, and leaching for 3 hours to obtain the leachate;

[0051] (2) sending the leachate obtained in step (1) into a filter device to filter to obtain a filtrate;

[0052](3) add sodium sulfate in step (2) gained filtrate and carry out precipitation to remove impurity, sodium sulfate add-on is copper, lead, zinc all heavy metal ions in the solution combine with sulfate radical to generate 95% of the required molar weight of precipitation, wait for precipitation After it is complete, it is sent to the filter equipment for filtration, and the filtered clear liquid is collected;

[0053] (4) Heat the clear liquid obtained in step (3) to 90°C, then slowly add soybean milk and stir, the carboxyl gr...

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Abstract

The invention discloses a method for removing residual heavy metal ions in a process of extracting a potassium salt from fly ash. The method comprises (1) mixing and leaching fly ash and water in a proportion to obtain a leaching solution, (2) feeding the leaching solution into a filter and carrying out filtration to obtain a filtrate, (3) adding a precipitant into the filtrate, carrying out precipitation to remove impurities, feeding the completely precipitated impurities into the filter and carrying out filtration, (4) heating the clear filtrate, then adding a protein into the filtrate, taking out the produced flocculate, and stopping protein addition after flocculate is not produced so that a clear liquor is obtained, and (5) carrying out heating evaporation crystallization on the clear liquor and carrying out centrifugal drying to obtain a potassium salt. The method solves the problem that fly ash contains heavy metal ion residues in potassium salt extraction, can produce a high-quality potassium salt, and has simple processes, high treatment efficiency and high social and economic benefits. The separated heavy metal ions can be used as melting raw materials of metal products.

Description

technical field [0001] The invention relates to the technical field of metallurgical industry production, in particular to a method for removing residual heavy metal ions in the process of extracting potassium salt from dedusting ash. Background technique [0002] my country is a country seriously deficient in potassium resources. At present, most of the potassium resources mined are mainly distributed in the Qaidam Basin of Qinghai and the brine potassium resources in Lop Nur, Xinjiang, accounting for more than 96% of the total reserves. The geographical location is relatively remote and the transportation is inconvenient. . However, the demand for potash fertilizers is mainly concentrated in the central and eastern regions, and logistics costs have also become a restrictive factor for the self-sufficient use of potash fertilizers in my country. my country's own potassium resources have problems in short-term supply capacity and long-term security. Therefore, it is of great...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/16C22B7/00C22B15/00C22B13/00C22B19/20C22B19/30
CPCC01D3/16C01P2006/80C22B7/006C22B13/045C22B15/0082C22B15/0089C22B19/20C22B19/30Y02P10/20
Inventor 姚丽艳
Owner 山东星苑锌业科技有限公司