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Preparation method of low-cost rutile titanium dioxide

A rutile-type titanium dioxide, low-cost technology, applied in chemical instruments and methods, titanium dioxide, non-metallic elements, etc., can solve the problems of not being recycled, waste hydrochloric acid, etc., and achieve the effect of reducing cost and simple process

Inactive Publication Date: 2017-09-15
ANHUI JXTB GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of serious waste of waste hydrochloric acid, a by-product of pesticide production in the prior art, which cannot be recycled well, and provides a method for preparing low-cost rutile titanium dioxide; adopting the technical scheme provided by the present invention , waste hydrochloric acid, a by-product of pesticide production, is concentrated and absorbed to a concentration of 20%-22%, and then mixed with industrial hydrochloric acid to form hydrochloric acid with a concentration of 25%-28%, which is used for the preparation of titanium dioxide seed crystals; using this hydrochloric acid can greatly The production cost of titanium dioxide is significantly reduced; and the production system provided by the invention is corrosion-resistant, has long service life, simple maintenance and low cost

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  • Preparation method of low-cost rutile titanium dioxide

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Embodiment 1

[0050] In this embodiment, a production system for preparing titanium dioxide seed crystals from pesticide waste hydrochloric acid concentrates the pesticide waste acid, including purification and absorption, which not only removes impurities in the waste hydrochloric acid, but also increases its concentration to reach titanium dioxide crystals. This kind of preparation conditions can not only reduce the cost of waste hydrochloric acid treatment in pesticide factories, but also reduce the cost of purchasing industrial hydrochloric acid for titanium dioxide manufacturers. The principle of waste hydrochloric acid concentration is: by adjusting the evaporation pressure, the hydrogen chloride gas is transferred from the liquid phase to the gas phase.

[0051] combine figure 1 The production system of this embodiment specifically includes a waste hydrochloric acid storage tank 1, an evaporator 2, a gas-liquid separator 3, an absorption tower 4, a hydrochloric acid storage tank 5, a...

Embodiment 2

[0077] A kind of production system of using pesticide waste hydrochloric acid to prepare titanium dioxide seed crystals in this embodiment is basically the same as in embodiment 1. The specific process of using pesticide waste hydrochloric acid to prepare titanium dioxide in this embodiment is as follows:

[0078] Step 1: The waste hydrochloric acid storage tank 1 supplies waste hydrochloric acid to the evaporator 2 through the transfer pump, and the negative pressure of the evaporator 2 fluctuates between 350-360KPa.

[0079] Step 2, the evaporator 2 supplies the gas-liquid separator 3 with the mixed gas of HCl and water vapor; a small amount of dilute hydrochloric acid containing HCl at the bottom of the evaporator 2 is discharged to the waste hydrochloric acid storage tank 1 .

[0080] Step 3: After the gas-liquid separator 3 supplies steam, the absorption tower 4 is opened, the liquid in the gas-liquid separator 3 is separated, and transferred to the waste hydrochloric acid...

Embodiment 3

[0097] A kind of production system of using pesticide waste hydrochloric acid to prepare titanium dioxide seed crystals in this embodiment is basically the same as in embodiment 1. The specific process of using pesticide waste hydrochloric acid to prepare titanium dioxide in this embodiment is as follows:

[0098] Step 1: The waste hydrochloric acid storage tank 1 supplies waste hydrochloric acid to the evaporator 2 through the transfer pump, and the negative pressure of the evaporator 2 fluctuates between 300-400KPa.

[0099] Step 2, the evaporator 2 supplies the gas-liquid separator 3 with the mixed gas of HCl and water vapor; a small amount of dilute hydrochloric acid containing HCl at the bottom of the evaporator 2 is discharged to the waste hydrochloric acid storage tank 1 .

[0100] Step 3: After the gas-liquid separator 3 supplies steam, the absorption tower 4 is opened, the liquid in the gas-liquid separator 3 is separated, and transferred to the waste hydrochloric acid...

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Abstract

The invention discloses a preparation method of low-cost rutile titanium dioxide, and belongs to the technical field of preparation of titanium dioxide. The preparation method of the titanium dioxide comprises concentration of waste hydrochloric acid, preparation of hydrochloric acid for crystal seeds, and preparation of the titanium dioxide. Pesticide waste hydrochloric acid is purified and absorbed to obtain a concentrated hydrochloric acid solution, industrial hydrochloric acid is mixed with the concentrated hydrochloric acid solution according to a certain ratio to prepare hydrochloric acid for crystal seeds, the prepared hydrochloric acid for crystal seeds is used in the acid dissolving process of the preparation of titanium dioxide crystal seeds, and the obtained titanium dioxide crystal seeds are added in the salt processing process of the titanium dioxide. The pesticide byproduct waste hydrochloric acid used in the invention has low price, so the waste acid treatment cost of pesticide factories is reduced, and the industrial hydrochloric acid purchasing cost of titanium dioxide manufacturers is reduced; and the preparation method has the advantages of low device cost, strong anticorrosive property and long service life.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide preparation, in particular to a method for preparing low-cost rutile titanium dioxide. The present invention concentrates the waste pesticide acid and uses it to acid-dissolve to obtain titanium dioxide crystal seeds, thereby achieving the purpose of reducing the production costs of pesticide manufacturers and titanium dioxide manufacturers. Background technique [0002] Titanium dioxide is an important white pigment and porcelain glaze. Compared with other white pigments, it has superior whiteness, tinting strength, hiding power, weather resistance, heat resistance and chemical stability, especially non-toxic. The production process of titanium dioxide belongs to the scope of fine chemical industry. It has always been the goal of titanium dioxide manufacturers to continuously optimize the production process and reduce the production cost of titanium dioxide to the greatest extent without...

Claims

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Application Information

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IPC IPC(8): C01G23/047C01B7/07
CPCC01G23/047C01B7/0706
Inventor 张修臻张本发
Owner ANHUI JXTB GRP