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Method for preparing titanium white

A technology of titanium dioxide and ferro-titanium, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc.

Inactive Publication Date: 2012-08-01
攀枝花新中钛科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no mature method for preparing titanium dioxide by using the sulfuric acid method to utilize the leaching residue of high titanium hydrochloric acid.

Method used

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  • Method for preparing titanium white
  • Method for preparing titanium white

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0217] A. Direct leaching of titanium concentrate with hydrochloric acid to prepare high-titanium hydrochloric acid leaching slag

[0218] 1. Weigh 7.2 tons of titanium concentrate, pour it into the reaction tank, and seal it.

[0219] 2. Pump 25 cubic meters of hydrochloric acid leaching solution with a concentration of 19% in the reaction tank. The hydrochloric acid leaching solution contains TFe 42g / L; Ca 2+ 1.2g / L; Mg 2+ 6.7g / L; Al 3+ 0.8g / L; Mn 2+ 2.0g / L, the leachate is preheated to 100°C by a graphite heat exchanger.

[0220] 3. Rotate the reaction tank to fully mix the leachate in the reaction tank with the titanium concentrate.

[0221] 4. Put steam into the reaction tank, quickly heat the leaching solution to about 120°C, and stop the steam.

[0222] 5. The heat of reaction will raise the temperature of the reaction tank to about 135°C. After holding the leaching solution for 3 hours, stop the reaction tank and directly discharge the reaction slurry into the fla...

Embodiment 2

[0252] Steps A, B, and D are the same as in Example 1, and the extraction agent used for the purification of step C titanium liquid is different,

[0253] details as follows:

[0254] After adding hydrochloric acid in Step C of Example 1, the titanium solution was subjected to three-stage countercurrent extraction, and the organic phase was formed by mixing 30% methyl isobutyl ketone (TBP) and 70% sulfonated kerosene. The O / A ratio of 1:1 is selected for extraction, and ferric ions are selectively extracted into the organic phase to be removed. The chemical composition of the titanium solution after extraction is shown in Table 14.

[0255] Table 14, the chemical composition of titanium liquid after extraction

[0256]

[0257]

[0258] The extracted titanium solution was sprayed under negative pressure to remove hydrochloric acid and concentrated at a constant temperature of 80°C to obtain a high-purity titanium solution. Its chemical composition is shown in Table 15....

Embodiment 3

[0262] see Figure 4 , increase the reaction slurry classification process in step A of embodiment 1, discharge the fine-grained slurry in the upper layer of the reaction tank to cool in the flash tower, then filter and wash with dilute hydrochloric acid, and the filter cake is dried in a rotary kiln to obtain High titanium hydrochloric acid leaching residue. The coarse-grained slurry in the lower layer of the reaction tank is cooled and directly filtered for solid-liquid separation. The filter cake is washed with dilute hydrochloric acid, dried naturally, and then calcined at 950°C in a rotary kiln to obtain artificial rutile, which can be used in the production of titanium dioxide by the chloride method.

[0263] The high-titanium hydrochloric acid leaching residue prepared in Step A of Example 1 was further implemented in the same manner as Steps B, C, and D of Example 1.

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Abstract

The invention provides a method for preparing titanium white. The method comprises the following steps of: preparing titanium solution from high titanium hydrochloric acid leaching residue, which is prepared from a titanium iron material through a hydrochloric acid leaching method, serving as a raw material or one of raw materials through acidolysis by using sulfuric acid; oxidizing the titanium solution, performing organic extraction and purification, and hydrolyzing to obtain metatitanic acid; and performing washing, salt treatment, calcination and surface treatment on the metatitanic acid to prepare the titanium white. According to the method, hydrochloric acid composite system solution containing chlorate is subjected to diffluent disposal and is recycled after the titanium iron material is leached, and is organically matched with a cyclic process of an organic extraction and purification and sulfuric acid system of the titanium solution, so that the titanium solution treatment process and the cost are reduced; and since the used hydrochloric acid, sulfuric acid and organic extraction agent can be recycled, ferrous sulfate (green vitriol) is not produced; and thus, the discharge of dilute sulfuric acid and acidic wastewater is effectively reduced, and the quality of the titanium white is obviously improved. According to the method provided by the invention, high efficiency, cleanness, low cost, low energy consumption and low waste discharge effects of an entire flow are realized; a novel process technology is provided for producing the titanium white by a sulfuric acid method; and fine grained rock type ilmenite with high calcium and magnesium content at the Panxi area can be effectively utilized.

Description

technical field [0001] The invention belongs to the field of titanium dioxide production, and in particular relates to a method for preparing titanium dioxide by using ferrotitanium materials. Background technique [0002] The reserves of titanium resources in the Panxi area of ​​my country account for more than 90% of the national reserves. The ilmenite in this area is mainly symbiotic rock ore with low grade of titanium dioxide and high content of calcium and magnesium impurities. The titanium dioxide grade of the titanium concentrate after selection is generally 46 -47wt%, the total of calcium oxide and magnesium oxide is generally about 5-7%. In addition, the fine particle size is another characteristic of this mine, and its particle size is less than 200 mesh, which accounts for more than 50%. With the mining of deep ore, ilmenite will become finer and finer. Using the ore to produce titanium dioxide by the sulfuric acid method will produce a large amount of waste sulfu...

Claims

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Application Information

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IPC IPC(8): C01G23/08
Inventor 陈树忠李建彬
Owner 攀枝花新中钛科技有限公司
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