A method for separating iron and sulfur from titanium dioxide wastewater

Abstract

This patent discloses a method for separating iron and sulfur from titanium dioxide wastewater. After adding gypsum crystal seeds, gypsum shape modifiers, and ferric hydroxide stabilizers to titanium dioxide wastewater and mixing evenly, adding slow-release calcium hydroxide, and separating by cyclone Obtain titanium gypsum and nano-ferric hydroxide solution; titanium gypsum is filtered and burned quickly to obtain gypsum gelling material; add coagulant to the nano-ferric hydroxide solution to obtain ferric hydroxide precipitation, liquid-solid separation, hydrogen After adding plasticizer to the iron oxide precipitation and mixing evenly, it is added into an autoclave to crystallize to obtain iron oxide red. The method has low production cost and high efficiency, and realizes high-quality recycling of resources.

Description

technical field [0001] The invention relates to the field of resource utilization of industrial waste acid, in particular to a method for utilizing the waste acid produced by sulfuric acid production of titanium dioxide. The gypsum can be used in the field of building materials and in the field of iron hydroxide for steelmaking. Background technique [0002] my country is a country with large titanium resources in the world, and the mineral type is mainly ilmenite. According to the data released by the United States Geological Survey (USGS) in 2015, my country's ilmenite reserves are 200 million tons, accounting for 28% of the world's reserves, ranking first in the world. There are 45 primary ilmenite deposits in China, mainly distributed in Panxi, Sichuan and Chengde, Hebei. According to the joint statistics of Titanium, Zirconium and Hafnium Branch of China Nonferrous Metals Industry Association and Panzhihua Iron and Steel Titanium Industry Group, in 2014, the country pro...

AI Technical Summary

Problems solved by technology

The discharge of titanium gypsum not only occupies a large amount of land, but also pollutes the environment

Due to the washing of rainwater, the titanium gypsum on the stacking yard will be lost. At the same time, after the titanium gypsum is washed and soaked by rainwater, soluble harmful substances will dissolve in water, and the flow and circulation of water in the environment will seriously pollute surface water and Groundwater; on the other hand, after the accumulation of titanium gypsum is exposed to the sun and blown by the wind, a small part will be scattered in the atmosphere in powder form and settle on the surface of foreign objects that may come into contact, polluting the environment and threatening health [Li Guozhong, Zhao Shuai, Yu Yang. Application research of titanium gypsum in the field of building materials [J]. Brick and tile, 2008, (3): 58-60]

[0005] Because titanium gypsum contains iron hydroxide, it has high moisture content, is not easy to dry, and has low added value.

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