阅读说明：本技术 一种钛精矿的除杂提纯方法 (Impurity removal and purification method of titanium concentrate ) 是由 方树坡 于 2021-05-12 设计创作，主要内容包括：本发明涉及一种钛精矿的除杂提纯方法,其包括向含有钛精矿粉的培养基中接种胶冻样类芽孢杆菌进行发酵,得到发酵产物；对所述发酵产物进行pH调节,然后加入嗜酸性氧化硫硫杆菌菌液,进行浸出,在浸出结束后进行洗涤、过滤,即得到除杂后的钛精矿。该方法利用微生物浸出法对钛精矿中的非铁杂质进行了有效除杂,而且避免了化学法能耗大、易造成环境污染等缺点,具有节能、环境友好的优点。(The invention relates to an impurity removal and purification method of titanium concentrate, which comprises the steps of inoculating Paenibacillus mucilaginosus into a culture medium containing titanium concentrate powder for fermentation to obtain a fermentation product; and (3) adjusting the pH of the fermentation product, adding acidophilic thiobacillus thiooxidans liquid, leaching, and washing and filtering after leaching to obtain the titanium concentrate after impurity removal. The method effectively removes the non-iron impurities in the titanium concentrate by using a microbial leaching method, avoids the defects of high energy consumption, easy environmental pollution and the like of a chemical method, and has the advantages of energy conservation and environmental friendliness.)

1. The impurity removal and purification method of the titanium concentrate is characterized by comprising the following steps: inoculating paenibacillus jelly to a culture medium containing titanium concentrate powder for fermentation to obtain a fermentation product; and (3) adjusting the pH of the fermentation product, adding acidophilic thiobacillus thiooxidans liquid, leaching, and washing and filtering after leaching to obtain the titanium concentrate after impurity removal.

2. The method for impurity removal and purification of titanium concentrate according to claim 1, wherein the culture medium comprises the following components: 50-60g/L glucose, 1-5g/L NaH₂PO₄，1-5g/L MgSO₄，0.5-2g/L CaCO₃，0.05-0.1g/L FeCl₃，5-10g/L NH₄(NO₃) 200-300g/L titanium concentrate powder;

preferably, the pH of the medium is 6.5-7.5.

3. The method for impurity removal and purification of titanium concentrate according to claim 1, wherein said Paenibacillus mucilaginosus is further subjected to strain activation before inoculation.

4. The method for impurity removal and purification of titanium concentrate according to claim 1, wherein the fermentation conditions comprise: the rotation speed of the shaking table is 150-.

5. The method for impurity removal and purification of titanium concentrate according to claim 1, wherein the fermentation process further comprises the following steps: and carrying out at least one cooling treatment on the fermentation product.

6. An impurity removal and purification method for titanium concentrate according to claim 5, wherein the temperature reduction treatment comprises the following steps: taking the fermented product out of the incubator, placing the fermented product in an environment with the temperature of 4 +/-0.5 ℃, immediately placing the fermented product back to the incubator for continuous fermentation after the temperature is reduced to 4 +/-0.5 ℃.

7. The method for impurity removal and purification of titanium concentrate according to claim 1, wherein the pH of the fermentation product is adjusted to 3-5.

8. The impurity-removing purification method of titanium concentrate according to claim 1, wherein OD of said Acidithiobacillus thiooxidans bacterial liquid₆₀₀The value is 0.9-1.1; preferably, the volume of the thiobacillus acidophilus liquid is 1-1.2 times of the volume of the fermentation product.

9. An impurity removal and purification method for titanium concentrate according to claim 1, wherein the thiobacillus acidophilus liquid is obtained by culturing thiobacillus acidophilus with Starky sodium thiosulfate overnight culture medium.

10. The method for impurity removal and purification of titanium concentrate according to claim 1, wherein the leaching conditions comprise: the temperature is 28-38 ℃, the rotating speed of the shaking table is 150-;

preferably, the washing is carried out with water, and the number of washing is 3-5.

Technical Field

The invention relates to the technical field of mineral processing, in particular to a method for removing impurities and purifying titanium concentrate.

Background

The titanium ore resource is often a multi-element paragenetic ore, the composition of which varies with the production place and is mainly used as a raw material for extracting iron, vanadium and titanium. The mined ores are subjected to mineral separation to obtain titanium concentrate which is used as a raw material for extracting titanium products.

The extraction of titanium from titanium concentrate mainly includes sulfuric acid process and chlorination process. In the sulfuric acid method, if the titanium concentrate is directly used as the raw material, a large amount of ferrous sulfate waste is generated, and if the titanium slag is used as the raw material, the generation of ferrous sulfate can be basically avoided. In the sulfuric acid method, the electric furnace smelting method is often used for producing the acid titanium slag, although the method has the advantages of short process flow, direct utilization of the byproduct metallic iron, less three wastes and the like; however, the electric furnace method can only reduce iron oxide in the ore into metallic iron and separate the metallic iron from the titanium slag, non-iron impurities are rarely reduced into an iron phase, and most of the non-iron impurities are enriched into a titanium slag phase.

Microbial treatment of metal ores begins with the bacterial leaching of metal sulphide ores, such as chalcopyrite, using microorganisms such as thiobacillus ferrooxidans to deoxidize and leach the ore. The microorganism processing technology can process extremely low-grade ores, has large processing scale and low cost, obtains more and more extensive attention in the field of metallurgy, and is rapidly applied to industrial production. Over decades of development, microbial processing of ores has not been confined to sulphide ores, but has begun to expand towards oxidic ores.

It would be desirable to develop new microbial treatment methods to effectively remove the non-ferrous impurities from titanium concentrates.

Disclosure of Invention

The invention aims to provide an impurity removal and purification method of titanium concentrate, which utilizes a microbial leaching method to remove and purify the titanium concentrate, effectively removes non-iron impurities in the titanium concentrate, avoids the defects of high energy consumption, easy environmental pollution and the like of a chemical method, and has the advantages of energy conservation and environmental friendliness.

To this end, in a first aspect, the present invention provides a method for purifying titanium concentrate, comprising: inoculating paenibacillus jelly to a culture medium containing titanium concentrate powder for fermentation to obtain a fermentation product; and (3) adjusting the pH of the fermentation product, adding acidophilic thiobacillus thiooxidans liquid, leaching, and washing and filtering after leaching to obtain the titanium concentrate after impurity removal.

Through carrying out the fermentation of the Paenibacillus mucilaginosus firstly, Si elements which are difficult to remove impurities in the ore can be released, and the destruction of mineral crystal lattices is facilitated, so that the subsequent impurity removal is facilitated. And part of the paenibacillus mucilaginosus is attached to the surface of the mineral particles through capsular polysaccharide to secrete small molecular organic acid, so that the decomposition of the mineral is facilitated, an acidic microenvironment is provided on the surface of the mineral particles, and the growth of the subsequent acidophilic thiobacillus thiooxidans is facilitated and the function of sulfur removal is achieved. In addition, the method can effectively remove Si and S and has a small amount of removal effect on other impurities such as CaO, MgO and the like, and the analysis shows that the acidic condition plays a certain role in dissolving Ca, Mg and other elements after the mineral crystal lattice is damaged.

Further, the culture medium comprises the following components: 50-60g/L glucose, 1-5g/L NaH₂PO₄， 1-5g/L MgSO₄，0.5-2g/L CaCO₃，0.05-0.1g/L FeCl₃，5-10g/L NH₄(NO₃) 200-300g/L titanium concentrate powder.

Further, the pH of the medium is 6.5-7.5, e.g., 6.5, 7.0, 7.2, 7.5, etc.

Further, the mesh number of the titanium concentrate powder is 50-100 meshes, such as 50 meshes, 60 meshes, 70 meshes, 80 meshes, 100 meshes and the like.

Further, the Paenibacillus mucilaginosus is subjected to strain activation before inoculation.

When Paenibacillus mucilaginosus is a cryopreserved species, activation of the species is typically performed prior to inoculation, a routine procedure commonly taken in the art. For example, on a solid medium suitable for growth of a strain, the strain to be frozen is streaked, and a single strain is cultured and then subjected to subsequent experiments.

Further, the conditions of the fermentation include: the rotation speed of the shaking table is 150-.

Further, in the fermentation process, the method also comprises the following steps: and in the fermentation process, the temperature of the fermentation product is reduced at least once. For example, the cooling treatment is performed 1 time, 2 times, 3 times, 4 times, or 5 times.

Further, the cooling treatment comprises the following steps: taking the fermented product out of the incubator, placing the fermented product in an environment with the temperature of 4 +/-0.5 ℃, immediately returning the fermented product to the incubator for continuous fermentation after the temperature is reduced to 4 +/-0.5 ℃.

The invention discovers accidentally in the research that the cooling treatment is carried out in the fermentation process of the paenibacillus jelly, which is not only beneficial to the impurity removal of silicon, but also can improve the impurity removal efficiency of sulfur. Analysis shows that the reason is that the proper temperature reduction treatment can increase the production of Paenibacillus mucilaginosus capsular polysaccharide, thereby influencing the impurity removal rate of silicon; meanwhile, the microstructure of the culture medium and the surface of the mineral also generates certain change, and the change is beneficial to the acidophilic thiobacillus thiooxidans to play a role.

In a specific embodiment, the cooling treatment is performed twice, and the fermented product is cooled when the fermented product is fermented for 8-9h and 23-26 h.

Further, the fermentation product is subjected to pH adjustment to a pH of 3-5.

Before the acidophilic thiobacillus thiooxidans liquid is added, the pH value of the fermentation product is adjusted to be acidic, which is not beneficial to the growth of the gel-like bacillus, however, the number of the gel-like bacillus thiooxidans after fermentation is more, and the requirement of impurity removal can be met.

Further, OD of the thiobacillus acidophilus bacterial liquid₆₀₀The value is 0.9-1.1, and the adding volume of the Acidithiobacillus thiooxidans bacterial liquid is 1-1.2 times of the volume of the fermentation product, for example, the adding volume is 1: 1.

The culture medium and the optimum pH value required by the paenibacillus jelly and the acidophilic thiobacillus thiooxidans are different, the paenibacillus jelly is cultured in a richer culture medium, then the pH value is properly adjusted, acidophilic thiobacillus thiooxidans liquid with higher concentration and stronger growth activity is added, and the aim of efficiently removing impurities of the two bacteria together can be fulfilled without additional material supplement.

Further, the thiobacillus acidophilus bacterial liquid is obtained by culturing thiobacillus acidophilus in a Starky sodium thiosulfate overnight culture medium.

Further, the leaching conditions include: the temperature is 28-38 ℃, the rotating speed of the shaking table is 150-.

Further, the washing is carried out by using water, and the washing times are 3-5 times.

Acidithiobacillus thiooxidans is chemoautotrophic bacteria, has the functions of quickly oxidizing elemental sulfur and reduced sulfides, and is obligatory, aerobic and acidophilic. Thiobacillus thiooxidans for oxidizing elemental sulphur or in reduced stateSulfide to obtain the energy required for growth and metabolism of the cells, NH⁺⁴As nitrogen source, with CO in the air₂Is a carbon source and has been applied to the field of bacterial metallurgy.

Paenibacillus mucilaginosus (Paenibacillus muciniphilaginosus) is a facultative aerobic silicate bacterium, can decompose aluminosilicate minerals in soil, release potassium ions, improve soil potassium deficiency barren, and has biological activities of dissolving phosphorus, fixing nitrogen and the like. It can not only decompose the original ecological silicate such as feldspar, mica and soil minerals to release K, P, Si elements available for plants, but also generate various bioactive substances to promote the growth of plants.

Compared with the prior art, the invention has the following advantages: according to the impurity removal and purification method for the titanium concentrate, provided by the invention, the microorganism leaching method is utilized to effectively remove the impurities of the non-iron impurities in the titanium concentrate, the defects of high energy consumption, easiness in causing environmental pollution and the like of a chemical method are avoided, and the method has the advantages of energy conservation, environmental friendliness, low production cost, easiness in operation and the like.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below. It should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In the following examples, titanium concentrate obtained by reselecting and magnetically separating ilmenite in Yunnan is used as a treatment object: TiO 2₂ 43.57％，CaO+MgO 3.09％，S 0.21％，SiO₂ 5.03％，P 0.022％。

Culturing Acidithiobacillus thiooxidans: weighing 14.65g of Starky sodium thiosulfate liquid culture medium (purchased from Shanghai Hongshun biology) in 1L of distilled water, heating and boiling until the Starky sodium thiosulfate liquid culture medium is completely dissolved, subpackaging, sterilizing at 121 ℃ for 15min under high pressure, and cooling to room temperature; acidithiobacillus thiooxidans was inoculated and cultured at 28 ℃ to OD at 175rpm₆₀₀About 1.0, the acidophilic thiobacillus thiooxidans bacterial liquid is preparedIt was used in the following examples.

Example 1

Crushing and grinding the ore sample to be treated to about 80 meshes, and preparing a culture medium: 50g/L glucose, 2g/L NaH₂PO₄，2g/L MgSO₄，0.5g/L CaCO₃，0.1g/L FeCl₃，8g/L NH₄(NO₃) Adjusting pH of 200g/L titanium concentrate powder to 7.0, subpackaging in triangular shake flask (wherein the titanium concentrate powder is firstly weighed in the shake flask, and then subpackaged after other components are prepared into liquid culture medium), autoclaving at 121 ℃ for 15min, and cooling to room temperature for later use.

Inoculating activated Paenibacillus mucilaginosus into the culture medium (three are parallel), and performing continuous fermentation culture for 40h at the rotation speed of 150rpm of a shaking table and the temperature of 30 ℃; and then adjusting the pH value of the fermentation product to be 4, adding an isopyknic thiobacillus thiooxidans liquid into the fermentation product, putting the fermentation product into an incubator, setting the rotation speed of a shaking table to be 200rpm and the temperature to be 28 ℃, taking the fermentation product out of the incubator after 48 hours, collecting precipitates after centrifugation, washing the precipitates for three times by using deionized water, then filtering the precipitates to remove bacteria, collecting titanium concentrate, and drying the titanium concentrate to obtain the titanium concentrate powder after impurity removal.

Detecting and calculating the impurity contents of CaO + MgO 2.53% and SiO in the titanium concentrate powder after impurity removal₂ 0.62％， S 0.06％，P 0.018％。

Example 2

Crushing and grinding the ore sample to be treated to about 80 meshes, and preparing a culture medium: 50g/L glucose, 2g/L NaH₂PO₄，2g/L MgSO₄，0.5g/L CaCO₃，0.1g/L FeCl₃，8g/L NH₄(NO₃) Adjusting pH of 200g/L titanium concentrate powder to 7.0, subpackaging in triangular shake flask (wherein the titanium concentrate powder is firstly weighed in the shake flask, and then subpackaged after other components are prepared into liquid culture medium), autoclaving at 121 ℃ for 15min, and cooling to room temperature for later use.

Inoculating activated Paenibacillus mucilaginosus into the culture medium (three are parallel), setting the rotation speed of a shaking table to be 150rpm, setting the temperature to be 30 ℃, fermenting, taking out a shaking bottle and placing the shaking bottle in a 4 ℃ cold room when the temperature is reduced to 8h and 24h, immediately returning the shaking bottle to an incubator after the temperature is reduced to 4 +/-0.5 ℃, and continuously performing fermentation culture for 40 h; and then adjusting the pH value of the fermentation product to be 4, adding an isopyknic acidophilic thiobacillus thiooxidans liquid, putting the mixture into an incubator, setting the rotation speed of a shaking table to be 200rpm and the temperature to be 28 ℃, taking the mixture out of the incubator after 48 hours, centrifuging the mixture, collecting precipitates, washing the precipitates for three times by using deionized water, filtering out bacteria-removing bodies, collecting titanium concentrate, and drying the titanium concentrate to obtain the titanium concentrate powder after impurity removal.

Detecting and calculating the average value of the content of each impurity in the titanium concentrate powder after impurity removal: CaO + MgO 2.40%, SiO₂0.21％，S 0.01％，P 0.016％。

Example 3

Crushing and grinding the ore sample to be treated to about 100 meshes, preparing a culture medium: 55g/L glucose, 1g/L NaH₂PO₄，4g/L MgSO₄，2g/L CaCO₃，0.05g/L FeCl₃，10g/L NH₄(NO₃) Adjusting pH of 250g/L titanium concentrate powder to 7.2, subpackaging in triangular shake flask (wherein the titanium concentrate powder is firstly weighed in the shake flask, and then subpackaged after other components are prepared into liquid culture medium), autoclaving at 121 ℃ for 15min, and cooling to room temperature for later use.

Inoculating activated Paenibacillus mucilaginosus into the culture medium (three are parallel), setting the rotating speed of a shaking table to be 170rpm, setting the temperature to be 30 ℃, fermenting, taking out a shaking bottle and placing the shaking bottle in a 4 ℃ cold room when the temperature is reduced to 9h and 25h, immediately returning the shaking bottle to an incubator after the temperature is reduced to 4 +/-0.5 ℃, continuously performing fermentation culture, and performing fermentation culture for 48 h; and then adjusting the pH value of the fermentation product to 3.5, adding an isopyknic thiobacillus thiooxidans bacterial liquid, putting the mixture into an incubator, setting the rotation speed of a shaking table to be 180rpm and the temperature to be 28 ℃, taking the mixture out of the incubator after 55 hours, collecting precipitates after centrifugation, washing the precipitates for three times by using deionized water, filtering out bacteria-removing bodies to collect titanium concentrate, and drying the titanium concentrate to obtain the titanium concentrate powder after impurity removal.

Detecting and calculating the average value of the content of each impurity in the titanium concentrate powder after impurity removal: CaO + MgO 2.44%, SiO₂0.17％，S 0.01％，P 0.015％。

Example 4

Crushing and grinding the ore sample to be treated to about 50 meshes, and preparing a culture medium: 60g/L glucose, 5g/L NaH₂PO₄，5g/L MgSO₄，1g/L CaCO₃，0.05g/L FeCl₃，5g/L NH₄(NO₃) Adjusting pH of 300g/L titanium concentrate powder to 6.5, subpackaging in triangular shake flask (wherein the titanium concentrate powder is firstly weighed in the shake flask, and then subpackaged after other components are prepared into liquid culture medium), autoclaving at 121 ℃ for 15min, and cooling to room temperature for later use.

Inoculating activated Paenibacillus mucilaginosus into the culture medium (three are parallel), setting the rotation speed of a shaking table to be 180rpm, setting the temperature to be 30 ℃, fermenting, taking out a shaking bottle and placing the shaking bottle in a 4 ℃ cold room when the temperature is reduced to 9h and 25h, immediately returning the shaking bottle to an incubator after the temperature is reduced to 4 +/-0.5 ℃, continuously performing fermentation culture, and performing fermentation culture for 48 h; and then adjusting the pH value of the fermentation product to 3, adding an isopyknic acidophilic thiobacillus thiooxidans liquid, putting the mixture into an incubator, setting the rotation speed of a shaking table to be 200rpm and the temperature to be 28 ℃, taking the mixture out of the incubator after 72 hours, collecting precipitates after centrifugation, washing the precipitates for three times by using deionized water, filtering to remove bacteria, collecting titanium concentrate, and drying to obtain the titanium concentrate powder after impurity removal.

Detecting and calculating the average value of the content of each impurity in the titanium concentrate powder after impurity removal: CaO + MgO 2.45%, SiO₂0.25％，S 0.01％，P 0.016％。

Example 5

Crushing and grinding the ore sample to be treated to about 100 meshes, preparing a culture medium: 55g/L glucose, 1g/L NaH₂PO₄，4g/L MgSO₄，2g/L CaCO₃，0.05g/L FeCl₃，10g/L NH₄(NO₃) Adjusting pH of 250g/L titanium concentrate powder to 7.4, subpackaging in triangular shake flask (wherein the titanium concentrate powder is firstly weighed in the shake flask, and then subpackaged after other components are prepared into liquid culture medium), autoclaving at 121 ℃ for 15min, and cooling to room temperature for later use.

Inoculating activated Paenibacillus mucilaginosus into the culture medium (three are parallel), setting the rotating speed of a shaking table to be 170rpm, setting the temperature to be 28 ℃, fermenting, taking out a shaking bottle when the temperature is fermented to the 4 th hour and the 24 th hour, placing the shaking bottle in a 4 ℃ cold room, immediately returning the shaking bottle to an incubator after the temperature is reduced to 4 +/-0.5 ℃, continuously performing fermentation culture, and performing fermentation culture for 48 hours; and then adjusting the pH value of the fermentation product to be 3.5, adding an isopyknic thiobacillus thiooxidans bacterial liquid, putting the same into an incubator, setting the rotation speed of a shaking table to be 180rpm and the temperature to be 28 ℃, taking out the same from the incubator after 55h, centrifuging, collecting precipitates, washing the precipitates for three times by using deionized water, filtering out bacteria-removing bodies, collecting titanium concentrate, and drying to obtain titanium concentrate powder after impurity removal.

Detecting and calculating the average value of the content of each impurity in the titanium concentrate powder after impurity removal: CaO + MgO 2.58%, SiO₂0.43％，S 0.06％，P 0.016％。

Example 6

Crushing and grinding the ore sample to be treated to about 100 meshes, preparing a culture medium: 55g/L glucose, 1g/L NaH₂PO₄，4g/L MgSO₄，2g/L CaCO₃，0.05g/L FeCl₃，10g/L NH₄(NO₃) Adjusting pH of 250g/L titanium concentrate powder to 7.2, subpackaging in triangular shake flask (wherein the titanium concentrate powder is firstly weighed in the shake flask, and then subpackaged after other components are prepared into liquid culture medium), autoclaving at 121 ℃ for 15min, and cooling to room temperature for later use.

Inoculating activated Paenibacillus mucilaginosus into the culture medium (three are parallel), setting the rotating speed of a shaking table to be 170rpm, setting the temperature to be 30 ℃, fermenting, taking out a shaking bottle when the temperature is 9h, placing the shaking bottle into a 4 ℃ cold room, immediately returning the shaking bottle into an incubator after the temperature is reduced to 4 +/-0.5 ℃, continuously performing fermentation culture, and performing fermentation culture for 48 h; and then adjusting the pH value of the fermentation product to 3.5, adding equal-volume acidophilic thiobacillus thiooxidans bacterial liquid, putting the mixture into an incubator, setting the rotation speed of a shaking table to be 180rpm and the temperature to be 28 ℃, taking the mixture out of the incubator after 55 hours, centrifuging the mixture, collecting precipitates, washing the precipitates for three times by using deionized water, filtering out bacteria-removing bodies to collect titanium concentrate, and drying the titanium concentrate to obtain the titanium concentrate powder after impurity removal.

Detecting and calculating the average value of the content of each impurity in the titanium concentrate powder after impurity removal: CaO + MgO 2.54%, SiO₂0.45％，S 0.05％，P 0.017％。

Comparative example 1

Crushing and grinding the ore sample to be treated to about 80 meshes, and preparing a culture medium: 50g/L glucose, 2g/L NaH₂PO₄，2g/L MgSO₄，0.5g/L CaCO₃，0.1g/L FeCl₃，8g/L NH₄(NO₃) Adjusting pH of 200g/L titanium concentrate powder to 7.0, subpackaging in triangular shake flask (wherein the titanium concentrate powder is firstly weighed in the shake flask, and then subpackaged after other components are prepared into liquid culture medium), autoclaving at 121 ℃ for 15min, and cooling to room temperature for later use.

Inoculating activated Paenibacillus mucilaginosus into the culture medium (three are parallel), continuously fermenting for 48h at the rotation speed of 180rpm of a shaking table and the temperature of 30 ℃, then centrifugally collecting precipitates, washing for three times by using deionized water, filtering out sterilization bodies and drying for later use.

And taking the dried mineral powder, adding a Starky sodium thiosulfate overnight culture medium according to the concentration of 200g/L, then adding an isopyknic thiobacillus thiooxidans bacterial liquid, putting the same into an incubator, setting the rotation speed of a shaking table to be 200rpm and the temperature to be 28 ℃, taking out the same from the incubator after 60h, centrifuging, collecting precipitates, washing the precipitates with deionized water for three times, filtering to remove bacteria, collecting titanium concentrate, and drying to obtain the titanium concentrate powder after impurity removal.

Detecting and calculating the average value of the content of each impurity in the titanium concentrate powder after impurity removal: CaO + MgO 2.90%, SiO₂3.35％，S 0.12％，P 0.020％。

Comparative example 2

Crushing and grinding the ore sample to be treated to about 80 meshes, and preparing a culture medium: 50g/L glucose, 2g/L NaH₂PO₄，2g/L MgSO₄，0.5g/L CaCO₃，0.1g/L FeCl₃，8g/L NH₄(NO₃) 200g/L titanium concentrate powder, adjusting pH to 7.0, and subpackaging in triangular shake flask (wherein the titanium concentrate powder is first called shake flask, and other components are prepared into liquid culture medium and then are divided intoPackaging), autoclaving at 121 deg.C for 15min, and cooling to room temperature for use.

Inoculating activated Paenibacillus mucilaginosus into the culture medium (three are parallel), and performing continuous fermentation culture for 40h at the rotation speed of 150rpm of a shaking table and the temperature of 30 ℃; and then adjusting the pH value of the fermentation product to be 4, adding 0.5 times of volume of acidophilic thiobacillus thiooxidans bacterial liquid, putting the mixture into an incubator, setting the rotation speed of a shaker to be 200rpm and the temperature to be 28 ℃, taking the mixture out of the incubator after 48 hours, centrifuging the mixture, collecting precipitates, washing the precipitates with deionized water for three times, filtering the precipitates to remove bacteria, collecting titanium concentrate, and drying the titanium concentrate to obtain the titanium concentrate powder after impurity removal.

Detecting and calculating the impurity contents of CaO + MgO 2.75% and SiO in the titanium concentrate powder after impurity removal₂ 2.74％， S 0.10％，P 0.020％。

The main differences in conditions and the contents of impurities after removal for examples 1 to 6 and comparative examples 1 to 2 are summarized in Table 1:

TABLE 1

As can be seen from table 1, in comparative example 1, after fermentation of paenibacillus mucilaginosus, and washing to remove bacteria, leaching was performed using thiobacillus acidophilus solution, however, the impurity removal rate was significantly inferior to that of the method of the present invention. By adopting the method provided by the invention, SiO in titanium concentrate₂And S are effectively removed, and the removal rate of non-iron impurities is further improved by proper temperature reduction treatment.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.