Novel production process of titanium dioxide powder

A production process and technology of titanium dioxide, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of long production cycle of titanium dioxide, low titanium yield, and high content of ferrous titanium, so as to shorten the production cycle and reduce residual waste. The effect of low titanium content and reduced solid impurity content

Active Publication Date: 2012-07-11
LOMON BILLIONS GRP CO LTD
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is the problem of high titanium content in ferrous...

Method used

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Embodiment Construction

[0008] The invention provides a novel titanium dioxide production process, which is processed by the following steps:

[0009] 1. The purchased titanium ore sand is crushed into titanium ore powder that meets the process requirements with a Raymond machine or wind-swept mill, and sent to the silo for storing and measuring titanium ore powder.

[0010] 2. Decompose titanium ore with concentrated sulfuric acid to produce soluble titanium sulfate. The main component of ilmenite is iron metatitanate (FeTiO 3 ), is a weak acid and weak base salt, which can be decomposed by strong acid. The reaction can be carried to the end with an excess of acid. Since this reaction is an exothermic reaction, the highest temperature can reach 250 ° C, so it is necessary to use a high boiling point acid - sulfuric acid to adapt to this reaction. In the process of acid decomposition, most of the various impurities in the ore powder are also decomposed to form the corresponding soluble sulfate, an...

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Abstract

The invention discloses a novel production process of titanium dioxide powder, comprising the process steps of performing ilmenite acidolysis, crystallizing, titanium liquid fine pressure filtering, concentrating, hydrolyzing, water-washing, bleaching, performing salt treatment, calcining and on the like. The process directly performs a hot-pressing treatment to a product of the ilmenite acidolysis by a filter press without subjecting to a settlement process. The technical scheme of the invention adopts the hot pressing filter method as follows: the mixed product of the titanyl sulfate and titanium sulfate after acidolysis, with a high temperature due to the acidolysis heat releasing, is directly pressure filtered by the filter press without subjecting to the settlement process and a cooling process. As the mixed product has low viscosity and good fluidity due to a high temperature, the content of the solid impurity in the pressure filtered titanium liquid is notably reduced, the crystal is big and the content of the residual titanium in the ferrous is low, so that the titanium yield is improved, meanwhile, the production period is shortened.

Description

technical field [0001] The invention relates to a novel titanium dioxide production process, which belongs to the field of titanium dioxide processing and production. Background technique [0002] At present, sulfuric acid method and hydrochloric acid method are mainly used in the production of titanium dioxide. The main production processes are ilmenite acid hydrolysis, sedimentation, hydrolysis, fine pressure filtration and concentration, calcining, crushing, ball milling, coating, washing, flash evaporation, steam powder, packaging. Treatment, the sedimentation adopted in the prior art is to adopt the static method to separate the solid and liquid. The defect of this method is that the content of ferrous iron in the metatitanic acid after the sedimentation is high on the one hand, which affects the whiteness of the titanium dioxide. On the one hand, the yield of titanium produced by this method is low. In addition, the sedimentation treatment usually takes about 6 hours, ...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 杨民乐陈建立吴彭森陈晓丽陈彦君赵波
Owner LOMON BILLIONS GRP CO LTD
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