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Recycling method of titanium white waste acid in manganese industry

A titanium dioxide waste acid and industry technology, applied in the field of industrial waste recycling, can solve problems such as difficulty in solid-liquid separation and pressure filtration, and achieve the effects of reducing sulfuric acid consumption in the industry, low environmental pollution and low cost

Active Publication Date: 2008-10-22
谭新乔 +2
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Problems solved by technology

[0003] The purpose of the present invention is to provide a new method for fully recycling sulfuric acid in waste acid in the manganese industry or other industries, specifically to solve the ubiquitous difficulty of solid-liquid separation and pressure filtration when using titanium dioxide waste acid problem

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  • Recycling method of titanium white waste acid in manganese industry

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Embodiment Construction

[0028] The present invention is described in further detail now in conjunction with accompanying drawing. refer to figure 1 , the principle that the present invention can solve the problem of pressure filtration by adopting a new technical solution is: control the ratio of ferric hydroxide colloid in the filter residue of each pressure filtration to a range that does not affect the effect of pressure filtration, thereby solving the problem of pressure filtration caused by a large amount of waste acid. Filtration is the difficult problem of solid-liquid separation. After repeated tests, it was found that as long as the proportion of ferric hydroxide colloid in the filter residue is less than 4.5%, the pressure filtration will not be affected. If it exceeds 4.5%, the pressure filtration will be difficult, and the greater the proportion, the more difficult the pressure filtration will be. Based on the above experimental results, the times of iron removal and pressure filtration ...

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Abstract

The invention provides a method for the recovery of titanium white waste acid in the manganese industry. The invention belongs to a novel method for the recovery of industrial wastes, in particular to a novel method for the recovery of waste acids generated in the process of producing titanium white powders. The aim of the invention is to provide a novel method for fully recovering sulfuric acids in waste acids in the manganese industry or other industries, particularly resolve the problem of difficult solid-liquid separation press filtration commonly existing in the use of titanium white waste acids. The technological process of the invention is as follows: infiltration, iron removal by oxidation(adding natural manganese dioxide), neutralization(adding calcium carbonate), the first press filtration, iron removal by oxidation(adding natural manganese dioxide), neutralization, heavy metal removal by sulfuration(adding sodium n-dimethyl-dithiocarbaminate), the second press filtration, (if necessary, the third press filtration or even more numbers of iron removal by oxidation and neutralization and press filtration are needed), refined press filtration. The method has the advantages of simple process, strong operability, low cost, obvious economic and environmental benefits and wide application, and the method also has essential characteristics and merits of the cycle economy.

Description

technical field [0001] The invention belongs to a new method for recycling industrial waste, in particular to a new method for recycling waste acid produced in titanium dioxide production. Background technique [0002] When titanium dioxide is produced by sulfuric acid method using ilmenite as raw material, 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 18-32%, and the content of ferrous sulfate is about 15-25%. At present, there are about 80-90 titanium dioxide manufacturers in the country, with an annual output of 2 million tons, and 20 million tons of waste acid, which contains up to 5 million tons of sulfuric acid. However, due to the pressure of environmental protection, most manufacturers neutralize the discharged waste acid with lime or calcium carbide mud. This environmental protection cost is allocated to the production cost of titanium dioxide at 1500-3000 yuan / ton. ...

Claims

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Application Information

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IPC IPC(8): C22B47/00B01D25/12
CPCY02P10/20
Inventor 谭新乔吴润彬邹秋阳
Owner 谭新乔
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