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Method for producing ferrous nitrate and barium sulfate by using waste acid obtained by producing titanium white by sulfuric acid method

A technology of ferrous nitrate and ferrous sulfate, applied in chemical instruments and methods, calcium/strontium/barium sulfate, iron compounds, etc., can solve the problems of large waste acid production and incomplete consumption, and achieve low equipment investment, Simple steps and high yield

Inactive Publication Date: 2012-08-01
WUJIANG YISHENG TEXTILE
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, due to the huge amount of waste acid obtained from the production of titanium dioxide by the sulfuric acid method, the above methods cannot be completely consumed. Therefore, it is necessary to explore a new method for comprehensive treatment and application of the waste acid obtained by the production of titanium dioxide by the sulfuric acid method

Method used

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Effect test

Embodiment 1

[0020] Embodiment 1: the method for producing ferrous nitrate and barium sulfate with sulfuric acid process to produce titanium dioxide gained waste acid, the method comprises following concrete steps:

[0021] Step A: mix the waste acid obtained by the sulfuric acid method to produce titanium dioxide with excess ferrous hydroxide, react sulfuric acid with ferrous hydroxide to generate ferrous sulfate; filter the reaction solution to obtain a filtrate mainly containing ferrous sulfate, containing a small amount of untreated The filter residue of the reacted ferrous hydroxide and insoluble impurities, the filter residue is deeply buried;

[0022] Step B: add excessive barium nitrate in the filtrate mainly containing ferrous sulfate of step A gained, react under stirring, generate ferrous nitrate and barium sulfate, filter reaction solution, separate barium sulfate precipitation and ferrous nitrate solution; This step In, a small amount of unreacted barium nitrate is also in the...

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Abstract

The invention provides a method for producing ferrous nitrate and barium sulfate by using waste acid obtained by producing titanium white by a sulfuric acid method. The method comprises the following steps: mixing the waste acid obtained by producing the titanium white by utilizing the sulfuric acid method with excess ferrous hydroxide for reaction, so as to generate ferrous sulphate; filtering the reaction liquid so as to obtain a filtrate which mainly contains the ferrous sulphate; adding excess barium nitrate to the filtrate which mainly contains the ferrous sulphate for reaction, so that the ferrous nitrate and the barium sulfate are generated, filtering the reaction liquid, and separating out the ferrous nitrate and barium sulfate; washing, drying and smashing barium the sulfate precipitate, so as to obtain the barium sulfate product; and adding less ferrous sulphate to the ferrous nitrate solution for neutralizing the barium nitrate, then feeding into a vacuum distiller for vacuum distillation so as to obtain a supersaturated ferrous nitrate solution, cooling, crystallizing and drying, so as to obtain the ferrous nitrate product.

Description

technical field [0001] The invention relates to the comprehensive utilization of waste acid obtained by sulfuric acid production of titanium dioxide, in particular to a method for producing ferrous nitrate and barium sulfate from the waste acid obtained by sulfuric acid production of titanium dioxide. Background technique [0002] The main raw materials of sulfuric acid titanium dioxide are titanium ore and sulfuric acid, and the reaction principle is as follows: [0003] Fe 2 o 3 +3H 2 SO 4 ==Fe 2 (SO 4 ) 3 +3H 2 O; [0004] TiO 2 +2H 2 SO 4 ==Ti(SO 4 ) 2 +2H 2 O; [0005] Fe+Fe 2 (SO 4 ) 3 ==3FeSO 4 , [0006] The pH of the solution was adjusted to 5-6, so that Ti(SO 4 ) 2 hydrolysis: [0007] Ti(SO 4 ) 2 +3H 2 O==H 2 TiO 3 ↓+2H 2 SO 4 , [0008] Filtrate the precipitate and heat to obtain titanium dioxide: [0009] h 2 TiO 3 ==TiO 2 +H 2 o [0010] Titanium dioxide is produced by sulfuric acid method. The waste acid in the production p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00C01F11/46
Inventor 谢善情
Owner WUJIANG YISHENG TEXTILE