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A method for preparing titanium dioxide seed crystals by using chlorinated waste acid

A technology for chlorinating waste acid and titanium dioxide, which is applied in the direction of chemical instruments and methods, titanium dioxide, chlorine/hydrogen chloride, etc., can solve the problems of inability to be recycled and waste of waste hydrochloric acid, and achieve the effect of reducing cost and simple process

Active Publication Date: 2020-05-05
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 serious waste phenomenon of waste hydrochloric acid, a by-product of pesticide production in the prior art, which cannot be well recycled, and provides a method for preparing titanium dioxide crystal seeds by using chlorinated waste acid; adopting the present invention provides The technical scheme, the waste hydrochloric acid by-product of pesticide production is concentrated and absorbed, and the concentration reaches 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 reduce the production cost of titanium dioxide; and the production system provided by the invention is corrosion-resistant, has long service life, simple maintenance and low cost

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  • A method for preparing titanium dioxide seed crystals by using chlorinated waste acid
  • A method for preparing titanium dioxide seed crystals by using chlorinated waste acid

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Embodiment 1

[0047] 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.

[0048] 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

[0074] A production system for preparing titanium dioxide seed crystals using pesticide waste hydrochloric acid in this embodiment is basically the same as in Example 1. The specific process of preparing titanium dioxide crystal seeds using pesticide waste hydrochloric acid in this embodiment is as follows:

[0075] 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.

[0076] 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 .

[0077] 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 ac...

Embodiment 3

[0091] A production system for preparing titanium dioxide seed crystals using pesticide waste hydrochloric acid in this embodiment is basically the same as in Example 1. The specific process of preparing titanium dioxide crystal seeds using pesticide waste hydrochloric acid in this embodiment is as follows:

[0092] 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.

[0093] 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 .

[0094] 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 ac...

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Abstract

The invention discloses a method for preparing a titanium dioxide seed crystal by utilizing chlorinated waste acid, and belongs to the technical field of titanium dioxide seed crystal preparation. Operation for preparing the titanium dioxide seed crystal is divided into three parts of concentration of waste hydrochloric acid, preparation of hydrochloric acid for a seed crystal and preparation of the titanium dioxide seed crystal; the method comprises an acid dissolution process of obtaining a concentrated hydrochloric acid solution after purifying and absorbing waste hydrochloric acid of a pesticide, then mixing industrial hydrochloric acid with the concentrate hydrochloric acid solution according to a certain proportion, and using the prepared hydrochloric acid for the seed crystal for preparing the titanium dioxide seed crystal. According to the method disclosed by the invention, a byproduct-the waste hydrochloric acid of the pesticide is used, the cost of the waste hydrochloric acid is low, and not only is the cost for treating waste acid by a pesticide manufacturer reduced, but also the cost of purchasing the industrial hydrochloric acid by a titanium dioxide manufacturer is reduced; the equipment cost is lower, the corrosion resistance is strong, and the service life is long.

Description

technical field [0001] The invention relates to the technical field of preparation of titanium dioxide seed crystals, in particular to a method for preparing titanium dioxide crystal seeds by using chlorinated waste acid. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/07C01G23/053
CPCC01B7/0712C01G23/053
Inventor 张修臻张本发
Owner ANHUI JXTB GRP
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