阅读说明：本技术 一种降低含铁尘泥造球用水量的方法 (Method for reducing water consumption for pelletizing of iron-containing dust and mud ) 是由 王飞 毛瑞 高峰 王崇斌 于 2020-07-21 设计创作，主要内容包括：本申请的一种降低含铁尘泥造球用水量的方法,包括：配料、加水混合、润湿、加水造球以及烘干,其特征在于：所述加水混合及加水造球工序中,加入温度为50℃-80℃的热水,所述热水中添加有表面活性剂,所述热水中表面活性剂与水的体积比为1:600～1:1200。本发明的方法降低生球含水量达15％-20％,减少工艺返矿量,提高了链篦机烘干工序的效率。(The application discloses a method for reducing water consumption of iron-containing dust and mud pelletizing includes: batching, add water and mix, wet, add water and pelletize and dry, its characterized in that: in the water adding and mixing and water adding and pelletizing process, hot water at the temperature of 50-80 ℃ is added, a surfactant is added into the hot water, and the volume ratio of the surfactant to the water in the hot water is 1: 600-1: 1200. The method of the invention reduces the water content of green pellets to 15-20%, reduces the amount of process return ores and improves the efficiency of the drying procedure of the chain grate.)

1. A method of reducing water usage for pelletizing iron-containing sludge, comprising: batching, add water and mix, wet, add water and pelletize and dry, its characterized in that: in the water adding and mixing and water adding and pelletizing process, hot water at the temperature of 50-80 ℃ is added, a surfactant is added into the hot water, and the volume ratio of the surfactant to the water in the hot water is 1: 600-1: 1200.

2. The method for reducing the water consumption for pelletizing the iron-containing dust mud in claim 1, wherein the method comprises the following steps: the surfactant is isomeric alcohol polyoxyethylene ether.

3. The method for reducing the water consumption for pelletizing the iron-containing dust mud in claim 1, wherein the method comprises the following steps: the water adding amount in the water adding and pelletizing process is 20-60% of that in the water adding and mixing process.

4. The method for reducing the water consumption for pelletizing the iron-containing dust mud in claim 1, wherein the method comprises the following steps: in the wetting procedure, the wetting time is 40-60 min.

5. The method for reducing the water consumption for pelletizing the iron-containing dust mud in claim 1, wherein the method comprises the following steps: the hot water is cooling water from a roller cooler, and is heated by steam when the temperature of the hot water is lower than 50 ℃.

Technical Field

The invention belongs to the technical field of pellets in metallurgical mining industry, and particularly relates to a method for reducing the water consumption for pelletizing iron-containing dust and mud.

Background

Disclosure of Invention

The invention aims to provide a method for reducing the water consumption for pelletizing iron-containing dust and mud so as to overcome the defects in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: a method of reducing water usage for pelletizing iron-containing sludge, comprising: the method comprises the steps of material preparation, water mixing, wetting, water pelletizing and drying, wherein in the water mixing and water pelletizing procedures, hot water at the temperature of 50-80 ℃ is added, a surfactant is added into the hot water, and the volume ratio of the surfactant to the water in the hot water is 1: 600-1: 1200.

Preferably, the surfactant is isomeric alcohol polyoxyethylene ether.

Preferably, the water addition amount in the water-adding pelletizing step is 20 to 60 percent of that in the water-adding mixing step.

Preferably, in the wetting step, the wetting time is 40 to 60 min.

Preferably, the hot water is cooling water from a roller cooler, and is heated by steam when the temperature of the hot water is less than 50 ℃.

The application discloses a method for reducing iron-containing dust mud balling water consumption, the cooling water through mainly recycling cylinder cooler improves the temperature of the used water of balling, adds surfactant simultaneously to all use the hot water that has added surfactant at raw materials mixing process and balling process, and let the raw materials carry out abundant wetting after through the raw materials mixing process and get into the balling process, reduce iron-containing dust mud balling water consumption through above mode.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic flow chart of a method for reducing the amount of water used for pelletizing iron-containing sludge according to an embodiment of the present invention;

FIG. 2 is a graph showing the water temperature versus raw material absorption for a method of reducing the amount of water used for pelletizing iron-containing sludge in accordance with an embodiment of the present invention;

FIG. 3 is a statistical chart of the water content of the winning pellet in a method for reducing the water consumption for pelletizing iron-containing sludge according to an embodiment of the present invention;

fig. 4 is a statistical diagram of the amount of the anti-ore in the method for reducing the amount of water used for pelletizing the iron-containing sludge according to the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Referring to the drawings of 1-3, the technical scheme of the invention is adopted in the production of a rotary hearth furnace in a certain workshop for pelletizing iron-containing dust and mud, cooling water in a roller cooler 1 enters a water tank 2, the measured water temperature is 45 ℃, high-temperature steam is introduced into the water tank 2 through a steam pipeline 4, the water is heated to 65 ℃, a surfactant adding device 5 adds isomeric alcohol polyoxyethylene ether liquid into the water tank 2, and the adding amount of the isomeric alcohol polyoxyethylene ether liquid is 1/1000 of the hot water flow entering the water tank 2 from the roller cooler 1. The stirring device 3 uniformly mixes the hot water and the surfactant in the water tank. The uniform hot water added with the surfactant enters a strong mixing device 6 and a pelletizing device 8 respectively. The water adding amount of the pelletizing device 8 is 40 percent of the water adding amount of the forced mixing device 6. The iron-containing dust and mud raw material enters a strong mixing device 6 after being mixed, water is added into the strong mixing device 6 to be mixed and then enters a middle bin 7, the retention time of the raw material in the middle bin is ensured to be more than 40min, then the raw material enters a pelletizing device 8 to be pelletized, and the discharged green pellets enter a drying process. Comparing the water content of green pellets produced by the pelletizing method of the present invention and the original pelletizing method with the dried return ore amount, from the view of industrial test data, under the condition that various raw material conditions are not changed, the water content of green pellets produced by the present invention is obviously lower than that of green pellets produced by the original pelletizing method, as shown in fig. 2. The green pellets are dried by the chain grate, the counting of the return ore quantity of the chain grate is shown in figure 3, and the return ore quantity of the chain grate is reduced by 10 percent on average by adopting the pelletizing method of the invention.

Referring to fig. 4, the amount of the return ores of the method for reducing the amount of water used for pelletizing the iron-containing dust and mud is reduced by 10% compared with the amount of the return ores of the conventional pelletizing method.

The invention researches the influence of water temperature and surfactant on the pelletizing process of the iron-containing dust mud and the water requirement for pelletizing, demonstrates the temperature and the utilization value of the cooling water waste heat of the roller cooler through laboratory research, introduces the cooling water of the roller cooler into the raw material mixing process and the pelletizing process to realize the recycling of the cooling water waste heat, and can improve the migration rate of water in the iron-containing dust mud material at high temperature. The influence of the addition of the surfactant isoalcohol polyoxyethylene ether in hot water on the wetting speed of the iron-containing dust mud is researched. The experimental results show that: under the condition that the mixture ratio of various raw materials is not changed, the water absorption rate and the water absorption capacity of the raw materials show an increasing trend along with the increase of the water temperature; and with the addition of the surfactant isomeric alcohol polyoxyethylene ether in the hot water, the surface tension of water can be reduced, the water absorption rate of the raw material is further improved, and the wetting of the iron-containing dust mud is facilitated. The water temperature is increased and the isomeric alcohol polyoxyethylene ether is added to ensure that the water requirement for the balling of the iron-containing dust mud is gradually increased

In summary, the beneficial effects of the invention at least include:

1. reduces the water consumption in the pelletizing process, reduces the water content of the qualified green pellets by 15 to 20 percent,

2. ensuring the quality of green pellets to reach the standard, reducing the burst condition of the pellets, reducing the process return ore amount by 10 percent,

3. the moisture content of the green pellets is reduced, the drying process efficiency of the drying grate is improved,

4. the cooling water of the roller cooler is recycled, the load of the cooling tower of the metallized pellet roller cooler is reduced, and the cooling efficiency of circulating water is improved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a detailed description of the present application, and it should be noted that modifications and embellishments could be made by those skilled in the art without departing from the principle of the present application, and these should also be considered as the protection scope of the present application.