Method for extracting potassium chloride and sodium chloride from secondary zinc oxide ash and application

A technology of secondary zinc oxide and potassium chloride, applied in chemical instruments and methods, purification of alkali metal chlorides and alkali metal halides, etc., can solve the problems of scarcity and waste potassium resources, reduce environmental pressure, and simplify the process flow. , the effect of reducing emissions

Active Publication Date: 2017-05-31
山东星苑锌业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method and application for extracting potassium chloride and sodium chloride from secondary zinc oxide ash, in order to solve the problem of waste of leaching waste liquid in the high value-added utilization process of secondary zinc oxide ash in the prior art and the Problems such as lack of existing potassium resources

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  • Method for extracting potassium chloride and sodium chloride from secondary zinc oxide ash and application

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Embodiment 1

[0032] A method for extracting potassium chloride and sodium chloride from secondary zinc oxide ash, comprising the following steps:

[0033] S1. Raw material leaching and filtration: Mix the raw material sub-zinc oxide ash with 30°C tap water at a mass ratio of 1:2 and stir for 30 minutes, let stand for 1 hour to obtain a mixed slurry with a solid-to-liquid ratio of 1:2, and filter to obtain a leachate.

[0034] S2, impurity removal and purification: first analyze and detect the concentration of copper and lead heavy metal ions in the leaching liquid in S1, and add zinc powder of 1.1 times the equivalent of copper and lead ions to replace the molar equivalent of chemical reaction equations (3-1) and (3-2), Stir until the reaction is complete, and filter to obtain filtrate A after solid-liquid separation;

[0035] Analyze and detect the fluoride ion concentration in the filtrate A, add calcium chloride of 1.1 times the calculated molar equivalent of the complete reaction with ...

Embodiment 2

[0039] A method for extracting potassium chloride and sodium chloride from secondary zinc oxide ash, comprising the following steps:

[0040] S1. Raw material leaching and filtering: mix the raw material secondary zinc oxide ash with industrial water at a temperature of 30°C according to the mass ratio of 1-4 and stir for 60 minutes, and let it stand for 3 hours to obtain a mixed slurry with a solid-liquid ratio of 1-4, and then filter get leaching solution.

[0041] S2, impurity removal and purification: first analyze and detect the concentration of copper and lead heavy metal ions in the leaching liquid in S1, and add zinc powder of 1.2 times the equivalent of copper and lead ions to replace the molar equivalent of the chemical reaction equations (3-1) and (3-2), Stir until the reaction is complete, and filter to obtain filtrate A after solid-liquid separation;

[0042] Analyze and detect the fluoride ion concentration in the filtrate A, add calcium chloride of 1.2 times th...

Embodiment 3

[0046] A method for extracting potassium chloride and sodium chloride from secondary zinc oxide ash, comprising the following steps:

[0047] S1. Raw material leaching and filtering: mix the raw material secondary zinc oxide ash with industrial water at a temperature of 50°C according to the mass ratio of 1-3 and stir for 45 minutes, and let it stand for 2 hours to obtain a mixed slurry with a solid-to-liquid ratio of 1:3, and then filter get leaching solution.

[0048] S2, impurity removal and purification: first analyze and detect the concentration of copper and lead heavy metal ions in the leaching liquid in S1, add zinc powder of 1.15 times the equivalent of copper and lead ion molar equivalents replaced by chemical reaction equations (3-1) and (3-2), Stir until the reaction is complete, and filter to obtain filtrate A after solid-liquid separation;

[0049] Analyze and detect the fluoride ion concentration in the filtrate A, add calcium chloride 1.15 times the calculated...

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Abstract

The invention discloses a method for extracting potassium chloride and sodium chloride from secondary zinc oxide ash and application. The method is particularly suitable for a treatment process for secondary zinc oxide ash obtained by taking zinc-bearing dust and sludge produced by rotary kilns, rotary hearth furnaces and the like in steel plants as a raw material. The method comprises the following steps: separating potassium in the secondary zinc oxide from other soluble salts and insoluble substances by a water washing way; concentrating and purifying an obtained solution to separate heavy metal ions such as zinc and lead dissolved in water and a part of calcium and magnesium ions; obtaining potassium chloride by means of evaporative crystallization separation to serve as a potassium fertilizer, wherein the sodium chloride is taken as a snow removing agent. By adopting the method, the problem of sewage discharge in a process of utilizing the high additional value of the secondary zinc oxide is solved; process waste water is used for preparing a potassium chloride fertilizer; the treatment process has the advantages of simple flow, high efficiency and extremely high environmental protection and economic benefits.

Description

technical field [0001] The invention relates to the technical field of chemical waste treatment and utilization, in particular to a method and application for extracting potassium chloride and sodium chloride from sub-zinc oxide ash. Background technique [0002] Zinc-containing dust sludge in iron and steel plants is harmful to the production of blast furnaces, which can seriously cause nodules in blast furnaces, upturned seals, increased sintering, and increased coke pulverization. Mud has taken certain measures to control its return to the sintering process and then into the blast furnace. At present, there are rotary kiln, rotary hearth furnace, etc. for the resource utilization of these dust sludge. These processes use iron and steel plant zinc-containing dust sludge as raw material to separate the zinc from the dust removal system to obtain sub-zinc oxide ash. Secondary zinc oxide ash is used as a raw material for the production of zinc ingots, nano zinc oxide and zin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/04C01D3/14C05D1/02C09K3/18
CPCC01D3/04C01D3/14C05D1/02C09K3/18
Inventor 姚丽艳
Owner 山东星苑锌业科技有限公司
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