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Method for producing ferrous carbonate and sodium sulfate from waste acid generated during titanium dioxide production through sulfuric acid method

A technology of ferrous carbonate and ferrous sulfate, applied in the direction of alkali metal sulfite/sulfite, chemical instruments and methods, iron compounds, etc., can solve the problems of incomplete consumption and large output of waste acid, and achieve simple steps , less investment in equipment and high yield

Inactive Publication Date: 2012-06-06
FIVESTAR NANTONG CHEM
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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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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: produce the method for ferrous carbonate and sodium sulfate with sulfuric acid process to produce titanium dioxide gained waste acid, this 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 solution, 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 The filter residue of unreacted ferrous hydroxide and insoluble impurities, the filter residue is deeply buried or processed by other processes;

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

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Abstract

The invention provides a method for producing ferrous carbonate and sodium sulfate from waste acids generated during the production of titanium dioxide through the sulfuric acid method. The waste acids generated during the production of titanium dioxide through the sulfuric acid method are mixed with an excessive amount of ferrous hydroxide to have reaction and produce ferrous sulfate; the reaction liquid is filtered to produce a filtrate mainly containing ferrous sulfate; an excessive amount of sodium carbonate is added to the filtrate mainly containing ferrous sulfate to produce ferrous carbonate and sodium sulfate, and the reaction liquid is filtered to separate ferrous carbonate precipitates and a sodium sulfate liquid; the ferrous carbonate precipitates are washed, dried and pulverized to obtain a ferrous carbonate product; a small amount of sulfuric acid is added to the sodium sulfate liquid to neutralize ammonium carbonate, and then the reaction liquid is fed to a reduced pressure distiller for reduced pressure distillation to produce a supersaturated solution of sodium sulfate; and the supersaturated solution of sodium sulfate is cooled and crystallized and then dried to obtain a sodium sulfate product.

Description

technical field [0001] The present invention relates to the comprehensive utilization of waste acid obtained from the production of titanium dioxide by the sulfuric acid method, in particular to a method for producing ferrous carbonate and sodium sulfate from the waste acid obtained by the production of titanium dioxide by the sulfuric acid method 。 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] Fe2O3+3H2SO4==Fe2(SO4)3+3H2O; [0004] TiO2+2H2SO4==Ti(SO4)2+2H2O; [0005] Fe+Fe2(SO4)3==3FeSO4, [0006] Adjust the pH of the solution to 5-6 to hydrolyze Ti(SO4)2: [0007] Ti(SO4)2+3H2O==H2TiO3↓+2H2SO4, [0008] Filter the precipitate and heat to obtain titanium dioxide: [0009] H2TiO3==TiO2+H2O [0010] Titanium dioxide is produced by sulfuric acid method. The waste acid in the production process mainly contains sulfuric acid and ferrous sulfate,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00C01D5/00
Inventor 谢善情
Owner FIVESTAR NANTONG CHEM