Resource utilization method of titanium dioxide waste acid leaching fused salt chlorination slag

A technology of molten salt chlorination slag and titanium white waste acid, which is applied in the fields of alkali metal halide purification, titanium oxide/hydroxide, aluminum oxide/aluminum hydroxide, etc., to achieve difficult-to-handle, simple process, and easy implementation Effect

Active Publication Date: 2021-11-02
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prior art does not disclose relevant reports involving the simultaneous treatment of molten salt chlorination slag and titanium dioxide waste acid. Therefore, it is imminent to study a green, low-cost process and method for comprehensive treatment and recycling of resources.

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  • Resource utilization method of titanium dioxide waste acid leaching fused salt chlorination slag

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Embodiment 1

[0037] Take 1000g of molten salt chlorination slag, use water: molten salt chlorination slag (composition as shown in Table 1) mass ratio of 3:1 to carry out water quenching, continue to use titanium dioxide waste acid (composition as in Table 2): molten salt chlorination The residue mass ratio is 1:1, fully dissolved under stirring, filtered and separated to obtain about 710.8g of filter residue 1, and its composition is shown in Table 3, TiO 2 Into the slag phase up to 93%, SiO 2 91.8% of Ca enters into the slag phase, and about 80% of Ca enters into the slag phase. After washing with water, it is used as raw material for titanium extraction by chloride.

[0038] Add appropriate amount of Fe powder (3.2g) to 2905mL of the supernatant obtained through the above filtration, and add an appropriate amount of Fe powder (3.2g) under stirring. After dissolving, quickly put it into a high-low temperature box to cool down to 10°C, and crystallize a relatively transparent FeSO 4 Crys...

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Abstract

The invention discloses a resource utilization method of titanium dioxide waste acid leaching fused salt chlorination slag, and belongs to the technical field of environmental protection. In order to reduce the waste treatment cost and difficulty in the titanium dioxide industry and realize resource recycling of wastes, the invention provides a resource utilization method for leaching fused salt chlorination residues from titanium dioxide waste acid, which comprises the following steps: carrying out water quenching on the fused salt chlorination residues and water, adding the titanium dioxide waste acid for leaching, and separating to obtain a supernate 1; carrying out reduction, crystallization and separation on the supernate to obtain a Fe-removed solution; adjusting the pH value of the Fe-removed solution to 5.5-6.0, and separating to obtain a supernatant 2; and carrying out nanofiltration separation on the supernate 2 to obtain a solution containing Mg and Mn and a solution containing Na, and finally, respectively recovering Mg, Mn and Na. According to the method, the titanium dioxide waste acid and the fused salt chlorination slag are subjected to cooperative treatment, Sc, Mg, Mn, Ti, Fe and the like and sodium chloride salt in the titanium dioxide waste acid and the fused salt chlorination slag are extracted and recycled respectively, and resources in the titanium dioxide industry are efficiently utilized.

Description

technical field [0001] The invention belongs to the technical field of "three wastes" treatment and environmental protection in the titanium dioxide industry, and specifically relates to a method for resource utilization of titanium dioxide waste acid leaching molten salt chloride slag. Background technique [0002] At present, the production of titanium dioxide in the titanium dioxide industry is still dominated by the sulfuric acid method, and the by-product w(H 2 SO 4 ) 20%~25% of waste sulfuric acid 5~8t, the amount of waste sulfuric acid has reached 25 million t in 2020, because waste acid contains about 5% w(Fe), about 0.7% w(Ti) and a small amount of calcium and magnesium , manganese, scandium and other metal ions are difficult to deal with. At present, most of them are neutralized by lime, which not only produces a large amount of titanium gypsum but also has high treatment costs, which seriously restricts the green development of sulfuric acid titanium dioxide proc...

Claims

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Application Information

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IPC IPC(8): C01G23/047C01G45/10C01G49/14C01F17/212C01F17/10C01F5/40C01D3/14C01F7/02
CPCC01G23/047C01F17/212C01F17/10C01G45/10C01F5/40C01G49/14C01D3/14C01F7/02Y02P10/20
Inventor 张小龙刘昌林王奎
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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