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Process for comprehensive utilization of waste acid containing titanium oxide

A technology of titanium dioxide waste acid and metatitanic acid, applied in the field of comprehensive utilization of titanium dioxide waste acid

Inactive Publication Date: 2003-02-12
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Japan's Ishihara Corporation has proposed a "Ishihara method", that is, the production of artificial rutile with the waste acid produced by the sulfuric acid method of titanium dioxide; "Sichuan Nonferrous Metals", No. 3, 2001, P65), but judging from the content disclosed so far, there are still problems in the treatment of waste acid containing high concentration iron

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  • Process for comprehensive utilization of waste acid containing titanium oxide
  • Process for comprehensive utilization of waste acid containing titanium oxide
  • Process for comprehensive utilization of waste acid containing titanium oxide

Examples

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Embodiment 1

[0055] The process flow of the comprehensive utilization method of titanium dioxide waste acid in this example is shown in Figure 1, the titanium dioxide waste acid is heated and hydrolyzed, the metatitanic acid obtained from hydrolysis is used to prepare titanium yellow powder, and the filtrate obtained from hydrolysis is used to prepare active zinc oxide , iron red (Fe 2 o 3 ) and zinc-containing ammonium sulfate.

[0056] (1) Heating hydrolysis of titanium dioxide waste acid

[0057] The components of the processed titanium dioxide waste acid and the content (percentage by weight) of each component are as follows:

[0058] h 2 SO 4 20.3 Fe 2.4

[0059] Mg 0.5 Ca 0.0037

[0060] TiO 2 9.51 V 0.0009

[0061] Co 0.00095

[0062] The equipment used is a reaction kettle equipped with heating temperature control, condensation reflux device and stirrer. Process conditions: add 1% seed crystal (weight percentage), press TiO 2 For content calculation, the seed cry...

Embodiment 2

[0081] The process flow of the comprehensive utilization method of titanium dioxide waste acid in this example is shown in Figure 2. The titanium dioxide waste acid is heated and hydrolyzed, and the metatitanic acid obtained from the hydrolysis is returned to the main process of titanium dioxide production, and the filtrate obtained from the hydrolysis is used to prepare active oxidation Zinc, basic zinc carbonate, iron red (Fe 2 o 3 ) and zinc-containing ammonium sulfate.

[0082] The difference between this embodiment and embodiment 1 is as follows:

[0083] (1) The metatitanic acid obtained by hydrolysis is returned to the main process of titanium dioxide production.

[0084] (2) The zinc-containing oxide added in the leaching process of preparing basic zinc carbonate and active zinc oxide is formed by calcining and alkali leaching hot-dip galvanizing ash containing 77% zinc. The technical conditions of calcination are as follows: a calcination temperature of 500° C. and...

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Abstract

A process for reclaiming the water acid generated during preparing titanium oxide includes such steps as heating waste acid for hydrolysis to obtain metatitanic acid, returning it to the production line to prepare titanium yellow powder; and wet metallurgy of the filtrate generated by the said hydrolysis and the zinc contained oxide to obtain active zinc oxide, alkaline zinc carbonate, Fe2O3 and Zn-contained ammonium sulfate.

Description

1. Technical field [0001] The invention relates to a treatment method for waste acid produced by sulfuric acid production of titanium dioxide. 2. Background technology [0002] There are two main production methods of titanium dioxide (titanium dioxide): the chloride method and the sulfuric acid method. Due to the limitation of raw materials in my country, the sulfuric acid method is mainly used. The biggest problem of the sulfuric acid method is that every ton of titanium dioxide produced will produce 5-7 tons of waste sulfuric acid with a concentration of about 20% and a large amount of dilute acid. Therefore, the treatment of waste acid is the key problem that must be solved in the preparation of titanium dioxide by the sulfuric acid method . [0003] Regarding the treatment of titanium dioxide waste acid, my country's titanium dioxide manufacturers have various methods: including neutralization discharge, production of potassium sulfate, ammonium sulfate, magnesium sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053C22B3/08
Inventor 何章亮曾冬梅张小霞刘凌那丽
Owner SICHUAN UNIV
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