Process for preparing phosphoric acid from waste sulfuric acid as by-product of titanium oxide powder by wet method

A technology of by-production of titanium dioxide and wet-process phosphoric acid, which is applied in the direction of sulfur trioxide/sulfuric acid, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of restricting the production and development of sulfuric acid-process titanium dioxide, difficult to recycle and benefit, etc., to achieve The effect of environmental protection is huge, the effect of reducing production costs and ensuring product quality

Inactive Publication Date: 2002-10-30
SICHUAN LOMON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the production and development of sulfuric acid titanium dioxide are severely restricted due to the difficulty in recycling and benefiting from titanium dioxide by-product sulfuric acid.

Method used

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  • Process for preparing phosphoric acid from waste sulfuric acid as by-product of titanium oxide powder by wet method
  • Process for preparing phosphoric acid from waste sulfuric acid as by-product of titanium oxide powder by wet method
  • Process for preparing phosphoric acid from waste sulfuric acid as by-product of titanium oxide powder by wet method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] With coal-fired high-temperature gas, the specification is Φ6×22m, and the volume is 600m 3 Feed dilute sulfuric acid 16.41t per hour in the spray concentration tower (its composition is: H 2 OSO 4 23.16%, FeSO 4 ·7H 2 O 17.6%; MnSO 4 1.1%; MgSO 4 1.3%; CaSO 4 ·H 2 O 1.2%; TiO 2 0.5%) carry out spray countercurrent contact heating and concentration, the temperature of hot air entering the tower is 600°C, the temperature of exiting the tower is 95°C, and the water evaporation rate per hour is 9.0t to obtain concentrated dilute 7.4t (it is composed of: H 2 OSO 4 51.3%, FeSO 4 ·7H 2 O 17.6%; MnSO 4 2.44%; MgSO 4 2.88%; CaSO 4 ·H 2 O 2.35%; TiO 2 1.11%).

Embodiment 2

[0042] Carry out spray concentration according to embodiment 1, the concentrated dilute sulfuric acid that comes out from the bottom of the concentration tower is cooled to 65 ℃, enters filter press and carries out solid-liquid separation, obtains 4.02t separation concentrated sulfuric acid per hour (it is composed of: H 2 OSO 4 70.7%, FeSO 4 ·7H 2 O 0.30%; MnSO 4 0.71%; Al 2 o 3 0.43%, TiO 2 0.06%), and 3.38t wet filter cake (liquid hold-up 35%).

Embodiment 3

[0044] Press the wet filter cake after the filter press separation of embodiment two, then use per hour 3.5t dilute sulfuric acid (its composition is: H 2 SO 4 23.16%; FeSO 4 ·7H 2 O 17.6%; MnSO 4 1.1%; MgSO 4 1.3%; CaSO 4 ·H 2 O 1.2%; TiO 2 0.5%) to wash dilute sulfuric acid 3.87t (its H 2 SO 4 Content: 37.13%), this acid is returned to Example 1 and merged with raw material dilute sulfuric acid for spray concentration; at the same time, 3.01t filter cake (liquid holding capacity 31%) is obtained per hour for sulfuric acid plant processing sulfuric acid or ferrous salt production treatment .

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Abstract

A process for preparing phosphoric acid from the waste sulfuric acid as by-product in preparing titanium oxide powder features the counter-current contact of said diluted sulfuric with high-temp gas for instantaneous evaporation and concentration. The compound impurities contained in the diluted sulfuric acid is deposited with the raising up of temp and acid concentration. Its advantages are low cost and protection environment.

Description

Technical field: [0001] The invention relates to a production method for producing wet-process phosphoric acid by using the by-product sulfuric acid produced by the sulfuric acid process to produce titanium dioxide. Background technique: [0002] components Content (%) components content specific gravity 1.32 (g / cm 3 ) h 2 SO 4 22.26 Fe 2 o 3 5.03 Al 2 o 3 0.2 MgO 0.4 TiO 2 0.68 V 0.03 Cr 0.006 Nb 0.004 Pb 0.015 P 0.005 CaO 0.43 [0003] Because, in addition to sulfuric acid, this acid also contains a large amount of other impurities, such as Fe in the form of ferrous sulfate. 2 o 3 , TiO in the form of metatitanic acid 2 , sulfuric acid coal, aluminum sulfate, calcium sulfate, etc., and a large amount of water can be returned to the production of titanium dioxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/88C01B17/90C01B25/222
Inventor 龚家竹池济亨郝虎李家权
Owner SICHUAN LOMON CORP
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