Comprehensive utilization method of titanium white waste acid

A technology of titanium white waste acid and seed crystals, which is applied in chemical instruments and methods, iron sulfate, calcium/strontium/barium sulfate, etc., can solve problems such as waste of resources and environmental pollution, and achieve the effects of environmental governance and pollution reduction

Active Publication Date: 2005-11-23
HUBEI WANRUN NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When titanium dioxide is produced by sulfuric acid method using ilmenite as raw material, about 8-10 tons of waste acid will be discharged for every ton of titanium dioxide produced. The content of sulfuric acid in these waste acids is about 18-24%, and the content of ferrous sulfate is about 15-25%, not only causing serious environmental pollution, but also wasting a lot of available resources in vain

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Add 3000L of waste acid to a 6000L reaction tank with stirring, start stirring and slowly add heavy calcium carbonate with a fineness of 120 mesh until the pH value of the solution is 4, pump it into a filter press for filtration, and the filtrate Sent to the ferrous sulfate tank, the analysis concentration is 260g / L;

[0029] 2. Roast the filter cake in a fluidized bed at 250-600°C to obtain gypsum;

[0030] 3. Put 500L of the above obtained filtrate ferrous sulfate solution in a 3000L seed crystal tank, dilute it with water to a concentration of 80g / L, and add about 98L of 30% liquid caustic soda under air stirring to adjust the pH value to 9, continue According to each cubic meter of material into 1.0m 3 / min of air, the temperature of the slurry during the reaction is about 20-22°C, and brown-red iron red seeds are obtained after oxidation.

Embodiment 2

[0033] 1. Add 3000L of waste acid to a 6000L stirring reaction tank, then add 500kg of ferrous sulfate heptahydrate, a by-product of titanium dioxide, after stirring and dissolving, slowly add ground calcium carbonate with a fineness of 120 mesh until The pH value of the solution is 4, and it is pumped into a filter press for pressure filtration, and the filtrate is sent into another ferrous sulfate tank, and the analytical concentration is 425g / L;

[0034] 2. Roast the filter cake in a fluidized bed at 250-600°C to obtain gypsum;

[0035] 3. Take 500L of the ferrous sulfate filtrate obtained in Item 1 in a 3000L seed tank, dilute it with water to a concentration of 80g / L, and add about 155L of 30% liquid caustic soda under air stirring to adjust the pH value to 9, and continue to press 1.5m per cubic meter of material 3 / min flow rate of air, the temperature of the slurry during the reaction is about 20-22°C, and brown-red iron red seeds are obtained after oxidation;

[003...

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PUM

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Abstract

Disclosed is a comprehensive utilization method of titanium white waste acid which comprises, (1) neutralizing free sulfuric acid in the waste acid with calcium carbonate, filtering so as to obtain plaster stone dust cake and ferrous sulfate filter liquor, (2) baking the obtained dust cake with rotary kiln or ebullition fluidized-bed plants, obtaining calcium sulphate product, (3) neutralizing the obtained ferrous sulfate solution with caustic soda to obtain ferrous hydroxide, letting in air for oxidizing under normal temperature so as to produce iron red seed crystal, (4) at the presence of seed crystal, heating with steam, carrying out two step oxidization with air, charging ferrous sulfate and caustic soda in a balanced manner, terminating reaction by selecting various time so as to obtain iron-oxide red slurry with different colors, when the reaction ends, subjecting the iron-oxide red slurry to white washing, sieving, filtering, drying and disintegrating, thus obtaining the iron-oxide red product.

Description

technical field [0001] The invention belongs to a comprehensive utilization method of industrial waste, in particular to a comprehensive utilization method of titanium dioxide waste liquid. Background technique [0002] When titanium dioxide is produced by sulfuric acid method using ilmenite as raw material, about 8-10 tons of waste acid will be discharged for every ton of titanium dioxide produced. The content of sulfuric acid in these waste acids is about 18-24%, and the content of ferrous sulfate is about It is 15-25%, which not only causes serious environmental pollution, but also wastes a large amount of available resources in vain. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a comprehensive utilization method of titanium white waste acid liquid which can reduce pollution and extract useful products from the waste liquid. [0004] The technical solution for solving the above problems is: the inventive m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 刘世琦
Owner HUBEI WANRUN NEW ENERGY TECH DEV
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