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Impurity removing and purifying method of sintering machine head dust lixivium

A technology of leaching liquid and head ash, which is applied in the field of impurity removal and purification of sintering head ash leachate, which can solve the problems of no sintering ash leachate purification and impurity removal, and the influence of potassium chloride product purity, achieving good impurity removal effect and filtration steps The effect of less, high purity

Pending Publication Date: 2020-03-27
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The current patent technology does not involve the purification and impurity removal technology of the sintered ash leachate, and the sintered ash leachate usually contains a large amount of Ca 2+ and a small amount of Pb 2+ 、Cu 2+ , Zn 2+ According to the different types of sintering ore, some sintering machine head ash also contains more SO 4 2- , if these ions are not purified and removed, the purity of the potassium chloride product formed after evaporation and crystallization will be affected

Method used

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  • Impurity removing and purifying method of sintering machine head dust lixivium

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Experimental program
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Effect test

Embodiment 1

[0031] A method for removing impurities and purifying a sintering machine head ash leachate, comprising the following steps:

[0032] a. Take the sintering head ash of four electric fields and soak in water, the water-cement mass ratio is 8:1, and the leach solution obtained by solid-liquid separation is 1L; the main components of the above four electric field sintering head ash are: iron 20.31%, potassium chloride 34.87%, chlorine Sodium chloride 3.53%, zinc 0.05%, lead 1.85%, magnesium oxide 0.80%, sulfur 7.66%, copper 0.11%, calcium oxide 6.27%, silicon dioxide 3.05%, aluminum oxide 2.86%, other ingredients 18.64%.

[0033]b. First add 0.31g of Na to the leaching solution 2 S·9H 2 O solid, stir 2min with the rotating speed of 300r / min;

[0034] c. Add 4.02g of anhydrous K 2 CO 3 Solid, stirred at a speed of 400r / min for 7min;

[0035] d. Finally add 20.08g of BaCl 2 2H 2 0, stirred at a speed of 500r / min for 12min;

[0036] e. vacuum filter the turbid leach solution...

Embodiment 2

[0038] A method for removing impurities and purifying a sintering machine head ash leachate, comprising the following steps:

[0039] a. Take the sintering head ash of the three electric fields and soak in water, the water-cement mass ratio is 6:1, and the leachate obtained by solid-liquid separation is 1L; the main components of the above three electric field sintering head ash are: iron 29.62%, potassium chloride 22.98%, chlorine Sodium chloride 2.34%, zinc 0.04%, lead 1.23%, magnesium oxide 1.23%, sulfur 4.94%, copper 0.08%; calcium oxide 8.25%, silicon dioxide 3.66%, aluminum oxide 2.27%, other ingredients 23.36%.

[0040] b. First add 0.21g of Na to the leaching solution 2 S·9H 2 O solid, stir 2min with the rotating speed of 200r / min;

[0041] c. Add 3.02g of anhydrous K 2 CO 3 Solid, stirred at a speed of 300r / min for 6min;

[0042] d. Finally add 15.15g of BaCl 2 2H 2 O, stirred for 11min at a speed of 400r / min;

[0043] e. vacuum filter the turbid leach solutio...

Embodiment 3

[0045] A method for removing impurities and purifying a sintering machine head ash leachate, comprising the following steps:

[0046] a. Take the sintering head ash of two electric fields and soak in water, the water-cement mass ratio is 4:1, and the leaching solution obtained by solid-liquid separation is 1L; the above-mentioned two electric field sintering head ash main components: iron 37.88%, potassium chloride 12.87%, chlorine Sodium chloride 1.32%, zinc 0.02%, lead 0.63%, magnesium oxide 1.55%, sulfur 3.04%, copper 0.05%; calcium oxide 9.66%, silicon dioxide 4.97%, aluminum oxide 1.69%, other ingredients 26.32%.

[0047] b. First add 0.32g of Na to the leaching solution 2 S·9H 2 O solid, stir 2min with the rotating speed of 300r / min;

[0048] b. Then add 4.33g of anhydrous K 2 CO 3 Solid, stirred at a speed of 400r / min for 7min;

[0049] c. Finally add 20.23g of BaCl 2 2H 2 0, stirred at a speed of 500r / min for 12min;

[0050] d. vacuum filter the turbid leaching...

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Abstract

The invention provides an impurity removing and purifying method of sintering machine head dust lixivium. The impurity removing and purifying method comprises the following steps of (1) performing water immersion on sintering machine head dust, and then performing solid-liquid separation to obtain the lixivium; (2) adding a heavy metal impurity removing agent to the lixivium obtained in the step (1), performing stirring, then adding a Ca2+ impurity removing agent, performing stirring, then adding a SO<4> 2- impurity removing agnet, and performing stirring; and (3), performing filtering separation. Compared with the prior art, the impurity removing and purifying method disclosed by the invention adopts a chemical impurity removing method to remove impurity ions in the sintering dust lixivium; the addition quantity and the adding order of raw materials are designed, and heavy metal, Ca 2+ and SO4 2- can be removed simultaneously only through one-time filtration, so that a few filtering steps are used, the method is simple and high-efficient, and secondary pollution can also not be generated; besides, in the application, the raw materials can be directly used after being purchased, and the situation of compounding the raw materials into a solution and the like is not needed, so that the impurity removing and purifying method is convenient and quick; and besides, the impurity removing effect is good; the lixivium after impurity removing excludes impurity ions; and after crystaling, the obtained potassium chloride product is high in purity.

Description

technical field [0001] The invention belongs to the technical field of extracting potassium chloride from sintering head ash, and in particular relates to a method for removing impurities and purifying leaching liquid of sintering head ash. Background technique [0002] At present, the sintering process of iron and steel enterprises generally adopts the electrostatic precipitator system for dust removal. The dust removal ash of the machine head contains a large amount of potassium element, which exists in the form of potassium chloride. In the actual recycling process, potassium chloride is continuously enriched and recycled in advance. It intensifies the gasification reaction of coke, causes coke dissolution and deterioration, and reduces the strength, which leads to the deterioration of the gas permeability of the lower part of the blast furnace, and seriously damages the forward movement and stability of the blast furnace. Therefore, most iron and steel enterprises are loo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B26/10
CPCC22B7/006C22B7/02C22B26/10Y02P10/20
Inventor 桂满城刘自民饶磊张耀辉马孟臣王洛郁雷
Owner MAANSHAN IRON & STEEL CO LTD
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