阅读说明：本技术 两步法冶炼钛渣的方法 (Method for smelting titanium slag by two-step method ) 是由 刘娟 黄家旭 李凯茂 肖军 于 2020-06-29 设计创作，主要内容包括：本发明涉及两步法冶炼钛渣的方法,属于冶金领域。本发明提供了两步法冶炼钛渣的方法,包括如下步骤：以钛精矿为冶炼原料,首先电炉冶炼得到TiO<Sub>2</Sub>品位为72％±1％的钛渣,然后出渣,出渣过程中向渣盆喷吹还原剂,将出炉钛渣还原成TiO<Sub>2</Sub>品位为74％±1％的钛渣产品。与现有钛渣冶炼工艺相比,本发明工艺操作简单,通过控制钛渣还原度,提高渣中FeO含量和降低低价钛氧化物含量,从而降低钛渣黏度,保证炉况顺行和出渣顺行。(The invention relates to a method for smelting titanium slag by a two-step method, belonging to the field of metallurgy. The invention provides a method for smelting titanium slag by a two-step method, which comprises the following steps: titanium concentrate is taken as smelting raw material, and TiO is obtained by electric furnace smelting 2 Titanium slag with the grade of 72% +/-1%, then deslagging, blowing a reducing agent into a slag basin in the deslagging process, and reducing discharged titanium slag into TiO 2 The grade of the titanium slag product is 74% +/-1%. Compared with the existing titanium slag smelting process, the process provided by the invention is simple to operate, and the FeO content in the slag and the low-valence titanium oxide content are improved and reduced by controlling the reduction degree of the titanium slag, so that the viscosity of the titanium slag is reduced, and the smooth operation of furnace conditions and slag discharging are ensured.)

1. The method for smelting titanium slag by a two-step method is characterized by comprising the following steps: the method comprises the following steps: titanium concentrate is taken as smelting raw material, and TiO is obtained by electric furnace smelting₂Titanium slag with the grade of 72% +/-1%, then deslagging, blowing a reducing agent into a slag basin in the deslagging process, and reducing discharged titanium slag into TiO₂The grade of the titanium slag product is 74% +/-1%.

2. The method for smelting titanium slag according to claim 1, wherein: the electric furnace smelting uses metallurgical coke as a reducing agent; preferably, the titanium concentrate: the mass ratio of the metallurgical coke is 100 (10-15); further preferably, the titanium concentrate: the mass ratio of the metallurgical coke is 100 (11-12).

3. The method for smelting titanium slag according to claim 1 or 2, wherein: the titanium concentrate mainly comprises the following chemical components in percentage by weight: TiO 2₂：45％～48％，TFe：30％～32％，FeO：32％～35％。

4. The method for smelting titanium slag according to claim 1, wherein: discharging slag when the power transmission reaches a ton value x (0.8-1.3) MWh of the total feeding amount; preferably, the slag is discharged when the electric quantity reaches the value of ton (1.2-1.25) MWh of the total feeding quantity.

5. The method for smelting titanium slag according to claim 1 or 4, wherein: and (4) deslagging when the FeO content of the sample in the furnace reaches 11-15%.

6. The method for smelting titanium slag according to claim 1, wherein: the flow speed of the slag discharged is 2-4 t/min.

7. The method for smelting titanium slag according to claim 1, wherein: the reducing agent sprayed to the slag basin is at least one of coal powder and coke powder; preferably, the reducing agent injected into the slag basin is pulverized coal.

8. The method for smelting titanium slag according to claim 7, wherein: the pulverized coal satisfies at least one of the following conditions: the granularity of the pulverized coal is +300 to-100 meshes; the fixed carbon content of the pulverized coal is 80-92%.

9. The method for smelting titanium slag according to claim 1, wherein: the coal injection amount in the slag discharging process is 50-200 kg/min; preferably, the coal injection amount in the deslagging process is 180-190 kg/min.

10. The method for smelting titanium slag according to claim 1, wherein: the gas used for blowing is nitrogen.

Technical Field

The invention relates to a method for smelting titanium slag by a two-step method, belonging to the field of metallurgy.

Background

The titanium concentrate is one of important raw materials for smelting titanium slag, and the ore is multielement associated ilmenite ore, so that the extraction and smelting difficulty is high. In the smelting process of the titanium slag, the viscosity of the titanium slag has an important influence on the production process, the rheological property of the titanium slag is reflected, if the viscosity of the titanium slag is high, foam slag can appear in the smelting process, so that the electrode runs at a high position, the bottom temperature is low, the upper temperature is high, and the thermal efficiency is lowAnd can cause great damage to the furnace cover, seriously affecting the smooth operation of the electric furnace. In addition, if the titanium slag has high viscosity, the metallic iron can not be well settled in the slag, so that the slag and the iron are difficult to separate, the phenomenon of slag and iron is caused, and TiO in the slag is reduced₂And in case of serious grade, even the situation of difficult slag discharging can occur. Therefore, the viscosity of the titanium slag has important influence on the smelting period of the titanium slag, the energy consumption in the smelting process, the smoothness of slag discharge and the grade of the titanium slag. The temperature and the titanium slag components are main factors influencing the viscosity, and the viscosity can be reduced by increasing the superheat degree when the slag components are constant; the viscosity of the slag is dependent on the slag composition when the temperature is constant. Among them, FeO and low-valent titanium (Ti) in slag₂O₃) The viscosity is greatly influenced, the viscosity of the titanium slag is reduced along with the increase of the content of FeO, but the grade of the titanium slag is influenced by the overhigh content of FeO. And the low-valence titanium oxide can increase the melting point of the system, thereby increasing the viscosity of the titanium slag. The FeO content and the low-valent titanium content are both controlled by the reduction degree in the smelting process, the lower the reduction degree, the higher the FeO content, and the lower-valent titanium and TiO₂The lower the content. Therefore, the influence of ensuring the quality of the titanium slag product and reducing the viscosity on the furnace condition in the smelting process is difficult to realize.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide a method for smelting titanium slag by a two-step method.

The invention provides a method for smelting titanium slag by a two-step method, which comprises the following steps: titanium concentrate is taken as smelting raw material, and TiO is obtained by electric furnace smelting₂Titanium slag with the grade of 72% +/-1%, then deslagging, blowing a reducing agent into a slag basin in the deslagging process, and reducing discharged titanium slag into TiO₂The grade of the titanium slag product is 74% +/-1%.

Further, the electric furnace smelting uses metallurgical coke as a reducing agent.

Preferably, the titanium concentrate: the mass ratio of the metallurgical coke is 100 (10-15).

Further preferably, the titanium concentrate: the mass ratio of the metallurgical coke is 100 (11-12).

Further, theThe titanium concentrate mainly comprises the following chemical components in percentage by weight: TiO 2₂：45％～48％，TFe：30％～32％，FeO：32％～35％。

Further, slag is discharged when the electric quantity reaches the value x (0.8-1.3) MWh of the ton value of the total feeding quantity.

Preferably, the slag is discharged when the electric quantity reaches the value of ton (1.2-1.25) MWh of the total feeding quantity.

Further, slag is discharged when the FeO content of the sample in the furnace reaches 11-15%.

Further, the slag flow rate of the slag is 2-4 t/min.

Further, the reducing agent sprayed to the slag basin is selected from at least one of coal powder and coke powder.

Preferably, the reducing agent injected into the slag basin is pulverized coal.

Further, the pulverized coal satisfies at least one of the following conditions: the granularity of the pulverized coal is +300 to-100 meshes; the fixed carbon content of the pulverized coal is 80-92%. The pulverized coal satisfying the above conditions has a sufficiently high reduction activity.

Preferably, the N is controlled according to the slag flow rate and the slag filling quantity of the slag basin₂Blowing speed and coal injection quantity. According to some embodiments of the invention, the coal injection amount in the deslagging process is 50-200 kg/min. Preferably, the coal injection amount in the deslagging process is 180-190 kg/min.

Further, the gas used for the blowing is nitrogen.

According to some embodiments of the invention, the method of smelting titanium slag further comprises the steps of: and cooling and crushing a titanium slag product obtained by reducing the discharged titanium slag to obtain a finished product.

According to some embodiments of the invention, the electric furnace smelting uses a large semi-closed circular electric furnace.

According to some embodiments of the invention, the electric furnace smelting is fed in batches.

The invention provides a method for smelting titanium slag by a two-step method, which has the beneficial effects that:

(1) compared with the existing titanium slag smelting process, the process provided by the invention is simple to operate, and the FeO content in the slag and the low-valence titanium oxide content are improved and reduced by controlling the reduction degree of the titanium slag, so that the viscosity of the titanium slag is reduced, and the smooth operation of furnace conditions and slag discharging are ensured.

(2) Blowing reducing agent with high reduction activity, such as coal powder, and deeply reducing discharged titanium slag to TiO in slag₂The grade is about 74% +/-1%, and the product quality is ensured.

(3) Compared with the existing titanium slag smelting process, the titanium slag smelting time is shortened by about 8%, the slag tapping time is shortened by about 10%, and the smelting power consumption is reduced by about 8%. The existing smelting process is to directly put the titanium concentrate and a reducing agent into a furnace according to a certain proportion to smelt titanium slag until the grade is 74% +/-1%, the FeO content in the grade titanium slag is lower than that of the titanium slag smelted by an electric furnace in the process until the grade is 72% +/-1%, the low-valence titanium content is higher, the viscosity of the titanium slag in the electric furnace is increased due to the low FeO content and the high-valence titanium content, the slag and iron separation is not facilitated, the slag is seen as iron, even the slag is difficult to discharge in serious cases, and the smooth operation of the process is seriously influenced. The invention can shorten the smelting time due to the relatively lower reduction degree, and can shorten the slag tapping time and correspondingly reduce the smelting power consumption due to the low viscosity of the titanium slag, smoother slag tapping and less abnormal slag tapping times.

(4) The method reduces the smelting power consumption, can correspondingly reduce the production cost, shorten the smelting time and increase the output of the smelting titanium slag, thereby playing the effects of saving energy, reducing consumption and improving efficiency.

Drawings

FIG. 1 is a schematic view of a process flow of smelting titanium slag by a two-step method in a specific embodiment.

Detailed Description

The invention provides a method for smelting titanium slag by a two-step method, which comprises the following steps: titanium concentrate is taken as smelting raw material, and TiO is obtained by electric furnace smelting₂Titanium slag with the grade of 72% +/-1%, then deslagging, blowing a reducing agent into a slag basin in the deslagging process, and reducing discharged titanium slag into TiO₂The grade of the titanium slag product is 74% +/-1%.

The titanium slag smelting method provided by the invention comprises the following steps of firstly reducing titanium slag to TiO in an electric furnace₂The content is 72% +/-1%, and the viscosity of the titanium slag in the furnace can be effectively reducedThe rheological property of the titanium slag is changed, so that the furnace condition is smooth, the slag discharging process is smooth, the power consumption of smelting is reduced, and the smelting time is shortened, thereby correspondingly improving the productivity of the titanium slag and reducing the production cost of the titanium slag. Blowing a reducing agent after deslagging to deeply reduce the discharged titanium slag to TiO₂The content is 74% +/-1%, and the product quality is ensured. The technological process of the two-step method for smelting titanium slag is shown in figure 1.

The scheme of the invention will be explained with reference to the examples. It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.

The Panzhihua No. 10 titanium concentrate in the following examples mainly comprises the following chemical components in percentage by weight: TiO 2₂：47.09％，FeO：34.64％，Fe₂O₃: 5.52%, TFe: 30.86 percent, 10# ore means the granularity of 200 meshes is more than 70 percent.