Comprehensive utilization method for solid wastes and waste acid in production process of titanium dioxide

A production process and solid waste technology, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve secondary pollution and other problems, achieve the effects of saving production water, solving energy problems, and reducing pressure

Active Publication Date: 2012-07-11
LUOHE XINGMAO TITANIUM IND
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  • Abstract
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Problems solved by technology

At present, landfills are mainly used to dispose of these solid wastes, which will cause secondary pollution and bring certain pressure to the ecological environment.

Method used

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Embodiment Construction

[0013] 1. Solid waste pretreatment

[0014] 1. Recycling of acidolysis waste residues: Collect the acidolysis residues to the residue recovery tank, add an appropriate amount of clean water (provided by the sewage treatment plant) and stir thoroughly, then send the diluted slurry to a plate and frame filter press for pressure filtration, and the filtrate It is a light titanium solution containing a certain amount of titanium sulfate and titanyl sulfate, all of which are reused after acidolysis. The waste residue after pressure filtration is used for secondary mixing and feeding to reduce the titanium content to below 15%, and then dried and crushed for later use.

[0015] 2. Ferrous sulfate pretreatment: dehydration of ferrous sulfate heptahydrate to produce ferrous sulfate monohydrate. Wash the ferrous sulfate heptahydrate with clean water to remove surface impurities in the cleaner first, filter to obtain pure ferrous sulfate heptahydrate, and then send it to the dissolutio...

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Abstract

The invention discloses a comprehensive utilization method for solid wastes and waste acid in the production process of titanium dioxide. The comprehensive utilization method comprises the following steps of: firstly, respectively treating acidolysis waste slag, ferrous sulfate and calcium sulfate dehydrate which are generated in the production process of the titanium dioxide by adopting a sulfuric acid method through drying, crushing and other methods for later use; secondly, uniformly mixing 70-80 parts by weight of iron pyrite, 1-10 parts by weight of acidolysis waste slag, 1-5 parts by weight of ferrous sulfate and 1-10 parts by weight of calcium sulfate dehydrate to obtain raw ore for producing sulfuric acid, calcining the raw ore in a fluidized bed furnace to obtain furnace gas meeting the production requirement of the sulfuric acid, carrying out purification procedures such as cooling, dust removal and dehydration on the furnace gas obtained in the second step and then converting and absorbing the treated furnace gas by adopting a catalyst to obtain the sulfuric acid. According to the comprehensive utilization method disclosed by the invention, wastes generated in the production process of titanium dioxide are reasonably utilized and the recycling of resources is realized.

Description

technical field [0001] The invention belongs to the treatment technology of waste by-products of titanium dioxide, and in particular relates to a comprehensive utilization method of solid waste and waste acid in the production process of titanium dioxide. Background technique [0002] Titanium dioxide is widely used in paint, plastic, papermaking and other industries, but the amount of waste produced in the production process is relatively large, and it is difficult to dispose of, mainly including (1) Acid hydrolysis waste residue: sulfuric acid production process produces titanium dioxide, ferro-titanium After the acid hydrolysis of the ore, acid hydrolysis waste residue is produced, which is removed after sedimentation. The acid hydrolysis waste residue is 18t / d, and the main component is: FeTiO 4 35%, Fe20~25% and a small amount of SiO 2 , CaSO 4 , ilmenite, titanium liquid and waste sulfuric acid, the pH value is about 4.5. (2) Ferrous sulfate: Fe in the acid solution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74
Inventor 李茂恩赵海鹏刘松贺张军超常玉祥
Owner LUOHE XINGMAO TITANIUM IND
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