Energy-saving joint production method and equipment of titanium dioxide plant for producing titanium dioxide, sulfuric acid and iron ore concentrate

Abstract

The invention provides an energy-savingjoint production method and equipment of a titanium dioxide plant for producing titanium dioxide, sulfuric acid and iron ore concentrate. The method comprises the following steps that ilmenite and concentrated sulfuric acid are put into a reactor for reaction to obtain titanyl sulfate, the titanyl sulfate is hydrolyzed to generate metatitanic acid and ferroussulfate,the metatitanic acid and the ferrous sulfate are putt into a separator for separation to obtain solid-state metatitanic acid, the ferrous sulfate and acid wastewater,lime is added in the acidwaste water for reactionsto produce calcium sulfate, and the solid-state metatitanic acid is used for producing titanium dioxide; after the ferrous sulfate is concentrated and put into a spray dryingtower to obtain anhydrous ferrous sulfate or ferrous sulfate monohydrate,the anhydrous ferrous sulfate or the ferrous sulfate monohydrate are put into a roasting boiling furnace to obtain solid-stateiron oxide, gaseous sulfur dioxide and sulfur trioxide, the sulfur dioxide is put into a converter, converted into the sulfur trioxide, and then absorbed by dilute acid to produce the concentrated sulfuric acid, and the concentrated sulfuric acid is returned to the reactor for reaction with the ilmenite. The entire process sufficiently utilizes thermal energy, waste gas, waste water and waste residues, and utilizes mineral resources to the utmost extent.

Description

technical field [0001] The invention relates to a method for producing titanium dioxide by using ilmenite as raw material and its comprehensive utilization, in particular to a method and equipment for producing titanium dioxide and comprehensive utilization of waste residue and wastewater. Background technique [0002] Titanium metal is the main raw material for national defense industry and alloy industry. The raw material of titanium metal is mainly titanium dioxide, and the raw material of titanium dioxide is extracted from ilmenite. Ilmenite is an oxide mineral of iron and titanium, also known as titanium magnet. Ilmenite is the main ore for extracting titanium. Ilmenite includes ilmenite placer and rock ore. The rock ore is heavy, gray to black, with a little metallic luster; the crystal is generally plate-shaped, and the crystals are aggregated into a block or granular shape. The composition is FeTiO 3 . Contains TiO 2 52.66%, is the main mineral for extracting tit...

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Problems solved by technology

[0010] The purpose of the present invention is to use ilmenite as raw material in the process of producing titanium dioxide, aiming at the disadvantages of existing waste water and waste residue, especially the comprehensive utilization cost of ferrous sulfate is high, the process is cumbersome and the decomposition time of ferrous sulfate with crystal water is long, etc. , a method and equipment for energy-saving joint production of titanium oxide, sulfuric acid and iron concentrate in a titanium dioxide factory are proposed. The invention can effectively utilize acidic wastewater and iron and sulfur resources in ferrous sulfate, and fully utilize the heat energy of the factory. Create a circular economic model for sulfuric acid titanium dioxide production

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