CN213951299U

CN213951299U - Metallurgical dust removal ash washing dechlorination system

Info

Publication number: CN213951299U
Application number: CN202020633639.4U
Authority: CN
Inventors: 郭秀键; 田文杰; 雍海泉; 郭灵巧
Original assignee: CISDI Technology Research Center Co Ltd; Chongqing CISDI Thermal and Environmental Engineering Co Ltd
Current assignee: CISDI Technology Research Center Co Ltd; Chongqing CISDI Thermal and Environmental Engineering Co Ltd
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2021-08-13
Anticipated expiration: 2030-04-23

Abstract

The utility model belongs to the technical field of the metallurgy, a metallurgical dust removal washing dechlorination system is related to, this method includes following step, stirring: adding water and stirring the metallurgical dedusting ash to obtain slurry; and (3) dehydrating: dehydrating the slurry to obtain strong brine and mud cakes; washing: washing the mud cakes with water to obtain iron slag, and recycling the washing water; purifying: adding cleaning agent pair in flushing waterCleaning water to obtain a cleaning mother solution; and (3) evaporation: evaporating, crystallizing and purifying the mother liquor to obtain KCl and mixed salt. The device comprises stirring equipment, dewatering equipment, flushing equipment, purifying equipment and evaporating equipment which are sequentially communicated. The utility model provides a metallurgical dust removal Cl of iron and steel enterprise^‑High content, influence on recycling and wide application prospect.

Description

Metallurgical dust removal ash washing dechlorination system

Technical Field

The utility model belongs to the technical field of the metallurgy, a metallurgical dust removal washing dechlorination system is related to.

Background

In the process of steel smelting, elements such as K, Na and Cl in raw materials can be enriched in flue gas and exist in KCl and NaCl forms, so that Cl such as blast furnace gas ash, sintering machine head ash and the like can be caused^-The content is higher. Along with the increasingly strict environmental protection policy, the metallurgical dedusting ash is strictly supervised when leaving factory, and the quality of sintering ore and the dedusting effect of flue gas can be seriously influenced by the in-factory return sintering recycling. Meanwhile, various potassium salts in China are widely applied in daily life, and the potassium resource has high external dependence. As KCl and NaCl in the metallurgical dedusting ash are easy to dissolve, K, Na and Cl in the metallurgical dedusting ash can be removed in a water washing mode, and KCl is extracted and utilized, so that the technology has strong market demand.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a metallurgical dust removal ash washing dechlorination system, the metallurgical dust removal ash of system solution is because of containing Cl^-And is difficult to use.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a water washing dechlorination system for metallurgical precipitator dust comprises stirring equipment, dehydration equipment, flushing equipment, purification equipment and evaporation equipment; the stirring equipment is communicated to dewatering equipment, and the dewatering equipment is communicated to the flushing equipment; the dehydration equipment is communicated to the purification equipment, and the purification equipment is communicated to the evaporation equipment; the dehydration equipment is communicated and refluxed to the stirring equipment so as to recycle the strong brine generated by the dehydration equipment.

Optionally, the flushing device is connected to the stirring device.

Optionally, the dewatering apparatus employs a membrane and frame filter press.

Optionally, the evaporation device employs an MVR evaporator or a multiple-effect evaporator.

The beneficial effects of the utility model reside in that:

the utility model discloses a stirring, dehydration, washing, purification, evaporation crystallization process are constituteed, and chlorine-containing metallurgical dust removal ash mixes the stirring with water, and the thick liquid is delivered to dewatering equipment dehydration and is obtained strong brine and mud cake, and the mud cake is washed and is squeezed with new water, and moisture reduces to 20% ~ 30%, Cl^-The removal rate is more than 95 percent; washing water is matched with strong brine for circulation to wash and enrich the dedusting ash; purifying the enriched strong brine by adding a purifying agent, and then carrying out evaporation crystallization to obtain KCl and mixed salt. The process solves the problem of metallurgical dedusting ash Cl of iron and steel enterprises^-High content, influence on recycling and wide application prospect.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.

Drawings

For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

fig. 1 is a process route diagram of the present invention.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

Referring to fig. 1, the utility model relates to a water washing dechlorination method for metallurgical dust removal ash, which comprises the following steps:

stirring: adding water and stirring the metallurgical dedusting ash to obtain slurry; and (3) dehydrating: dehydrating the slurry to obtain strong brine and mud cakes; washing: washing the mud cakes with water to obtain washing water, iron slag and dechlorinated dedusting ash; purifying: adding a purifying agent into the flushing water to purify the flushing water to obtain purified water; and (3) evaporation: evaporating the crystallized purified water to obtain the product.

Alternatively, in the step "flush", after obtaining the flush water, returning to the step "Stirring, namely stirring and dehydrating by using flushing water once or for many times; in the step of stirring, the ratio of water to the dedusting ash is 1.5: 1-2: 1; in the step of stirring, the stirring time is 40min to 60 min; in the step of "purification", potassium carbonate and sodium sulfide are used as purifiers to remove Fe in the washing water³⁺、Ca²⁺、Mg²⁺(ii) a In the step of purifying, the molar ratio of the washing water to the purifying agent is 1: 1-1.5: 1.

The utility model discloses still relate to a metallurgical dust removal washing dechlorination system, including agitated vessel, dewatering equipment, flushing device, clarification plant, the evaporation equipment who communicates in proper order.

Optionally, the flushing device is communicated to the stirring device; the dehydration equipment adopts a diaphragm plate-and-frame filter press, the feeding pressure is 0.5MPa to 0.6MPa, and the squeezing dehydration pressure is 1MPa to 1.5 MPa; the evaporation equipment adopts an MVR evaporator or a triple-effect evaporator.

The scheme relates to a metallurgical dedusting ash washing dechlorination system which comprises stirring equipment, dewatering equipment, flushing equipment, purifying equipment and evaporating equipment; the stirring equipment is communicated to dewatering equipment, and the dewatering equipment is communicated to the flushing equipment; the dehydration equipment is communicated to the purification equipment, and the purification equipment is communicated to the evaporation equipment; the dehydration equipment is communicated and refluxed to the stirring equipment so as to recycle the strong brine generated by the dehydration equipment.

Specifically, the metallurgical dedusting ash is added with water and stirred for 40-60 min at a water-cement ratio of 1.5: 1-2: 1, the slurry is sent to a dewatering device for dewatering to obtain strong brine and a mud cake, the mud cake is washed and squeezed with fresh water at a water-cement ratio of 0.5: 1-2: 1, the water content is reduced to 20-30%, and Cl is added^-The removal rate is more than 95 percent; washing water is added into strong brine to circularly wash and enrich the dedusting ash, and can also be circularly washed, and the washing water is added into the strong brine to be circularly washed and enriched to be close to saturation to enter subsequent treatment; purifying the enriched concentrated brine by adding a purifying agent, and then carrying out evaporation crystallization to respectively obtain KCl and mixed salt with the purity of more than or equal to 80%. The process solves the problem of metallurgical dedusting ash Cl of iron and steel enterprises^-The content of the sodium silicate is high,influence the recycling and has wide application prospect.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.

Claims

1. A water washing dechlorination system for metallurgical precipitator dust is characterized by comprising stirring equipment, dewatering equipment, flushing equipment, purifying equipment and evaporating equipment; the stirring equipment is communicated to dewatering equipment, and the dewatering equipment is communicated to the flushing equipment; the dehydration equipment is communicated to the purification equipment, and the purification equipment is communicated to the evaporation equipment; the dehydration equipment is communicated and refluxed to the stirring equipment so as to recycle the strong brine generated by the dehydration equipment.

2. The metallurgical dedusting ash washing and dechlorinating system as set forth in claim 1, wherein the dewatering equipment adopts a diaphragm plate and frame filter press, and the water content of the dewatered mud cake is 20-30%.

3. The metallurgical precipitator dust washing dechlorination system in claim 1, wherein the evaporation device adopts an MVR evaporator or a multi-effect evaporator.

4. The metallurgical dust washing dechlorination system of claim 1, wherein the flushing device is connected to the stirring device.