阅读说明：本技术 一种利用钒钛磁铁矿隧道窑直接提钒工艺 (Process for directly extracting vanadium by using vanadium-titanium magnetite tunnel kiln ) 是由 冯志全 高国武 尹宏坤 吉孔会 李佳徽 吕晓东 于 2018-08-20 设计创作，主要内容包括：一种利用钒钛磁铁矿隧道窑直接提钒工艺,将钒钛磁铁矿矿粉、钠盐、碱、无烟煤和粘结剂造制成球团；将球团装满盛料筐中,所述盛料筐为圆柱状且上部敞口,在盛料筐上设有直径小于球团直径的多个透气孔；将装满料的盛料筐摞在窑车内,采用钒钛磁铁矿隧道窑进行氧化焙烧；将装好料的各窑车由预热段入口依次送入,并点燃盛料筐内盛装的球团,在预热段内对窑车内的物料预热,然后将窑车经转运车依次转入加热段,窑车内的钒钛铁原料在无烟煤燃烧形成高温下的加热段内提钒反应,反应后,再将窑车由冷却段出口送出,水浸出钒,灼烧,得到片钒。优点是：在钒钛磁铁矿提钒过程中,节约能源,降低能耗成本,使钒钛磁铁矿受热均匀,缩短反应时间,提高提钒效果。(A process for directly extracting vanadium by using a vanadium titano-magnetite tunnel kiln is characterized in that vanadium titano-magnetite mineral powder, sodium salt, alkali, anthracite and a binder are made into pellets; filling the pellets into a material containing basket, wherein the material containing basket is cylindrical and has an open upper part, and a plurality of air holes with the diameter smaller than that of the pellets are arranged on the material containing basket; stacking the material containing baskets filled with the materials in a kiln car, and carrying out oxidizing roasting by adopting a vanadium titano-magnetite tunnel kiln; feeding the kiln cars loaded with materials in sequence from an inlet of a preheating section, igniting pellets contained in a material containing basket, preheating the materials in the kiln cars in the preheating section, sequentially transferring the kiln cars to a heating section through a transfer car, carrying out vanadium extraction reaction on vanadium-titanium-iron raw materials in the kiln cars in the heating section at high temperature formed by burning anthracite, and after the reaction, conveying the kiln cars out from an outlet of a cooling section, leaching out vanadium from water, and firing to obtain vanadium tablets. The advantages are that: in the vanadium extraction process of the vanadium titano-magnetite, the energy is saved, the energy consumption cost is reduced, the vanadium titano-magnetite is heated uniformly, the reaction time is shortened, and the vanadium extraction effect is improved.)

1. A process for directly extracting vanadium by using a vanadium titano-magnetite tunnel kiln is characterized by comprising the following steps:

the method comprises the following specific steps:

1) preparing vanadium titano-magnetite powder, sodium salt, alkali, anthracite and a binder into pellets with the diameter less than or equal to 40mm by using a disc granulator or a granulator; the blending amount of the anthracite is 7-8% of the mass of the vanadium titano-magnetite ore powder;

2) filling the pellets into a material containing basket, wherein the material containing basket is cylindrical, the upper part of the material containing basket is open, the inner diameter of the material containing basket is 300mm, the height of the material containing basket is 0.7m, and a plurality of air holes with the diameter smaller than that of the pellets are formed in the material containing basket; stacking the material containing baskets filled with materials in a kiln car in an upper layer and a lower layer, arranging the material containing baskets on the kiln car in a 10-row and 10-column mode, wherein the length of the kiln car is 3.5-3.7 m, and the width of the kiln car is 3.5-3.7 m, and carrying out oxidizing roasting by adopting a vanadium titano-magnetite tunnel kiln;

the vanadium titano-magnetite tunnel kiln comprises a kiln body and a track, wherein the kiln body consists of a preheating section, a heating section and a cooling section, the preheating section and the heating section are arranged side by side and attached, a first air passage is arranged on the wall body on the outer side of the heating section, the first air passage is introduced into the preheating section through the top of the kiln body and the wall body on the outer side of the preheating section, a first valve for switching on and off the first air passage is arranged on the wall body on the outer side of the heating section, a second air passage with two communicated sides and a second valve for switching on and off the second air passage are arranged on the wall body of the kiln body between the heating section and the preheating section, and a transfer trolley with the movement direction vertical to the track direction is arranged between the discharge end of the preheating;

the length of the preheating section is 50-70 meters, the length of the heating section is 80-100 meters, and the length of the cooling section is 20-25 meters; the running time of the kiln car in the heating section is 3-5 hours;

feeding the kiln cars loaded with materials in sequence from an inlet of a preheating section, igniting pellets contained in a material containing basket, preheating the materials in the kiln cars in the preheating section, then sequentially transferring the kiln cars to a heating section through a transfer car, carrying out vanadium extraction reaction on vanadium-titanium-iron raw materials in the kiln cars in the heating section at high temperature formed by burning anthracite, after the reaction, sending the kiln cars out from an outlet of a cooling section, leaching vanadium with water at 80-85 ℃, and firing to obtain vanadium tablets.

2. The process for directly extracting vanadium by using the vanadium titano-magnetite tunnel kiln as claimed in claim 1, which is characterized in that: the sodium salt is NaCl, the alkali is sodium hydroxide, the binder is dextrin, and the heat of the anthracite is 5000-6000 kcal.

3. The process for directly extracting vanadium by using the vanadium titano-magnetite tunnel kiln as claimed in claim 1, which is characterized in that: the additive amount of the alkali accounts for 5.5-6% of the mass of the vanadium titano-magnetite powder, the additive amount of the salt accounts for 2-2.2% of the mass of the vanadium titano-magnetite powder, and the blending amount of the binder is 1% of the mass of the vanadium titano-magnetite powder.

4. The process for directly extracting vanadium by using the vanadium titano-magnetite tunnel kiln as claimed in claim 1, which is characterized in that: the mass content of vanadium in the vanadium titano-magnetite is 1.6-1.8%.

5. The process for directly extracting vanadium by using the vanadium titano-magnetite tunnel kiln as claimed in claim 1, which is characterized in that: the diameter of the pellet prepared in the step 1) is 10-40 mm.

6. The process for directly extracting vanadium by using the vanadium titano-magnetite tunnel kiln as claimed in claim 5, which is characterized in that: the material of the material containing basket is 310 heat-resistant steel, and the thickness of the material containing basket is 10 mm; the diameter of each air hole is 8mm, and the center distance between every two adjacent air holes is 12 mm.

7. The process for directly extracting vanadium by using the vanadium titano-magnetite tunnel kiln as claimed in claim 1, which is characterized in that: the width of vanadium titano-magnetite tunnel kiln is 2m, and the height is 1.6 m.

8. The process for directly extracting vanadium by using the vanadium titano-magnetite tunnel kiln as claimed in claim 1, which is characterized in that: the inlet temperature of the preheating section is 50 ℃, the temperature of the heating section is 800-850 ℃, and the outlet temperature of the cooling section is 150-200 ℃.

9. The process for directly extracting vanadium by using the vanadium titano-magnetite tunnel kiln as claimed in claim 1, which is characterized in that: and a tail gas processor is arranged between the heating section and the cooling section at the top of the kiln body, and harmful gas generated in the vanadium-titanium reduction process is recovered.

10. The process for directly extracting vanadium by using the vanadium titano-magnetite tunnel kiln as claimed in claim 1, which is characterized in that: soil blocking platforms are arranged on the bottom surfaces of the two sides of the track in the kiln body, so that the material slag falling off from the kiln car is located between the soil blocking platforms and the corresponding side wall bodies, and the material slag is prevented from entering the track to block the kiln car from moving.

Technical Field

The invention relates to a process for directly extracting vanadium by using a vanadium titano-magnetite tunnel kiln.

Background

The vanadium is added into steel production, the strength and the toughness of steel can be improved, the strength can be improved by 10 to 20 percent by adding 0.1 percent of vanadium into structural steel, and the vanadium-containing steel is widely applied to the fields of machinery manufacturing, automobiles, aerospace, railways and bridges. Vanadium is mainly extracted from vanadium titano-magnetite.

The method is characterized in that abundant vanadium titano-magnetite is stored in the Korean region of China, (the vanadium content is high after enrichment and is 1.4% -1.8%, a direct vanadium extraction technology can be adopted, and a rotary kiln is used in China to carry out a large amount of researches on the direct field of the vanadium titano-magnetite.

Disclosure of Invention

The invention aims to solve the technical problem of providing a process for directly extracting vanadium by using a vanadium titano-magnetite tunnel kiln, which saves energy, reduces energy consumption cost, uniformly heats vanadium titano-magnetite, shortens reaction time and improves vanadium extraction effect in the vanadium titano-magnetite vanadium extraction process.

The technical solution of the invention is as follows:

a process for directly extracting vanadium by using a vanadium titano-magnetite tunnel kiln comprises the following specific steps:

1) preparing vanadium titano-magnetite powder, sodium salt, alkali, anthracite and a binder into pellets with the diameter less than or equal to 40mm by using a disc granulator or a granulator; the blending amount of the anthracite is 7-8% of the mass of the vanadium titano-magnetite ore powder;

2) filling the pellets into a material containing basket, wherein the material containing basket is cylindrical, the upper part of the material containing basket is open, the inner diameter of the material containing basket is 300mm, the height of the material containing basket is 0.7m, and a plurality of air holes with the diameter smaller than that of the pellets are formed in the material containing basket; stacking the material containing baskets filled with materials in a kiln car in an upper layer and a lower layer, arranging the material containing baskets on the kiln car in a 10-row and 10-column mode, wherein the length of the kiln car is 3.5-3.7 m, and the width of the kiln car is 3.5-3.7 m, and carrying out oxidizing roasting by adopting a vanadium titano-magnetite tunnel kiln;

the vanadium titano-magnetite tunnel kiln comprises a kiln body and a track, wherein the kiln body consists of a preheating section, a heating section and a cooling section, the preheating section and the heating section are arranged side by side and attached, a first air passage is arranged on the wall body on the outer side of the heating section, the first air passage is introduced into the preheating section through the top of the kiln body and the wall body on the outer side of the preheating section, a first valve for switching on and off the first air passage is arranged on the wall body on the outer side of the heating section, a second air passage with two communicated sides and a second valve for switching on and off the second air passage are arranged on the wall body of the kiln body between the heating section and the preheating section, and a transfer trolley with the movement direction vertical to the track direction is arranged between the discharge end of the preheating;

the length of the preheating section is 50-70 meters, the length of the heating section is 80-100 meters, and the length of the cooling section is 20-25 meters; the running time of the kiln car in the heating section is 3-5 hours;

feeding the kiln cars loaded with materials in sequence from an inlet of a preheating section, igniting pellets contained in a material containing basket, preheating the materials in the kiln cars in the preheating section, then sequentially transferring the kiln cars to a heating section through a transfer car, carrying out vanadium extraction reaction on vanadium-titanium-iron raw materials in the kiln cars in the heating section at high temperature formed by burning anthracite, after the reaction, sending the kiln cars out from an outlet of a cooling section, leaching vanadium with water at 80-85 ℃, and firing to obtain vanadium tablets.

Further, the sodium salt is NaCl, the alkali is sodium hydroxide, the binder is dextrin, and the heat of the anthracite is 5000-6000 kcal.

Furthermore, the addition amount of the alkali accounts for 5.5-6% of the mass of the vanadium titano-magnetite powder, the addition amount of the salt accounts for 2-2.2% of the mass of the vanadium titano-magnetite powder, and the addition amount of the binder accounts for 1% of the mass of the vanadium titano-magnetite powder.

Further, the mass content of vanadium in the vanadium titano-magnetite is 1.6% -1.8%.

Further, the diameter of the pellet prepared in the step 1) is 10-40 mm.

Furthermore, the material of the material containing basket is 310 heat-resistant steel, and the thickness of the material containing basket is 10 mm; the diameter of each air hole is 8mm, and the center distance between every two adjacent air holes is 12 mm.

Further, the width of the vanadium titano-magnetite tunnel kiln is 2m, and the height of the vanadium titano-magnetite tunnel kiln is 1.6 m.

Further, the inlet temperature of the preheating section is 50 ℃, the temperature of the heating section is 800-850 ℃, and the outlet temperature of the cooling section is 150-200 ℃.

Furthermore, a tail gas processor is arranged between the heating section and the cooling section at the top of the kiln body, and harmful gases generated in the vanadium-titanium reduction process are recovered.

Furthermore, soil blocking platforms are arranged on the bottom surfaces of the two sides of the track in the kiln body, so that the slag falling off from the kiln car is located between the soil blocking platforms and the corresponding side wall bodies, and the slag is prevented from entering the track to block the kiln car from moving.

The invention has the beneficial effects that:

simple process, energy saving and good vanadium extraction effect. The tunnel kiln is adopted as the reduction equipment of the vanadium titano-magnetite, has large processing capacity and is suitable for continuous large-scale production. Anthracite is added into the vanadium titano-magnetite to provide vanadium extraction reaction heat energy, so that the energy consumption cost is greatly reduced, the vanadium titano-magnetite is uniformly heated, the reduction time is shortened, the vanadium extraction rate is high, and the vanadium extraction rate can reach more than 85%.

Set up first air flue at heating section outside wall body, set up the second air flue on the wall body of heating section and preheating intersegmental kiln body, can realize letting in the heat of heating section preheating section, preheat the vanadium titano-magnetite raw materials in the preheating section before the reduction reaction to realize energy-conserving production.

Drawings

FIG. 1 is a schematic structural view of the invention;

fig. 2 is a sectional view of fig. 1.

In the figure: 1-preheating section, 2-heating section, 3-cooling section, 4-track, 5-soil retaining table, 6-first air passage, 7-first valve, 8-second air passage, 9-second valve, 10-transfer vehicle and 11-tail gas processor.

Detailed Description