Method for separating iron and sulfur from titanium dioxide wastewater

Abstract

The invention discloses a method for separating iron and sulfur from titanium dioxide wastewater, and the method comprises the following steps: adding gypsum seed crystals, a gypsum shape adjusting agent and a ferric hydroxide stabilizer into the titanium dioxide wastewater, uniformly mixing, adding slow-release calcium hydroxide, and performing cyclonic separation to obtain titanium gypsum and asolution containing nano ferric hydroxide; filtering the titanium gypsum by pressing, and quickly burning the titanium gypsum to obtain a gypsum cementing material; and adding a coagulant into the solution containing the nano ferric hydroxide to obtain a ferric hydroxide precipitate, performing liquid-solid separating, adding a shaping agent into the ferric hydroxide precipitate, mixing uniformly,adding into an autoclave to crystallize to obtain ferric 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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