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A method for controlling the water content of titanium gypsum

A titanium gypsum and water content technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of environmental pollution, resource waste, and environmental secondary pollution, and achieve the goals of reducing production, creating economic benefits, and good environmental benefits Effect

Active Publication Date: 2021-10-26
TONGLING CHEM IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Ananda Titanium Industry Co., Ltd. currently has 80kt / a titanium dioxide production equipment, which produces about 400,000 tons of titanium dioxide waste acid with an annual rate of about 20%. Some of these titanium dioxide waste acids are concentrated and reused, and some are used for copper Guanshan Company produces phosphate fertilizers, but there are still about 500 tons of titanium dioxide waste acid (the content of sulfuric acid in titanium dioxide waste acid is 100 tons) every day. About 20% of the titanium dioxide waste acid is neutralized and discharged up to the standard. This process produces more than 200,000 tons of wet base per year (water content 45-50%) dihydrate red gypsum (titanium gypsum), this titanium gypsum can only be treated as inorganic waste landfill, thus causing secondary pollution to the environment, not only polluting the environment, but also causing serious resources waste

Method used

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  • A method for controlling the water content of titanium gypsum

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Titanium white waste acids from Annada Titanium Co., Ltd., main ingredients 2 SO 4 The content was 23.93%.

[0023] The steps employed in the present invention are as follows:

[0024] (1) Preparation of seed crystals: Take 200 g of titanium white waste acid and retain 300g neutralization (including 20 to 30%) to obtain titanium plaster (CASO) 4 · 2h 2 O) seed crystal;

[0025] (2) Crystal modified agent control: 5% crystalline type modified dodecyl benzene sulfonate solution 2g is added to the reaction temperature of 30 to 40 ° C, stirring.

[0026] (3) Titanium white waste acid neutralization: Taking limestone as a neutralizing agent and titanium white waste acid in progress, limestone powder is slowly added, add 20% limetric pulp 215g, pH 1.3, reaction temperature 30 ~ 40 ° C, the reaction time was 2 hours. Titanium white waste acids and reaction chemical equations are as follows:

[0027] Caco 3 + H 2 SO 4 + H 2 O = CASO 4 · 2h 2 O + CO 2

[0028] (4) Separation of tit...

Embodiment 2

[0030] Titanium white waste acids from Annada Titanium Co., Ltd., main ingredients 2 SO 4 The content is 19.03%.

[0031] The steps employed in the present invention are as follows:

[0032] (1) Preparation of seed crystals: Take 200 g of titanium white waste acid and the remaining 300 g of the reaction liquid (including 20 to 30%);

[0033] (2) Crystal modified agent control: 5% crystalline type modified dodecyl benzene sulfonate solution 2g is added to the reaction temperature of 30 to 40 ° C, stirring.

[0034] (3) Titanium white waste acid neutralization: Taking limestone as a neutralizing agent and titanium white waste acid, the limestone powder is slowly added, adding 20% ​​limetric pulp 150g, pH 1.0, reaction temperature 30 ~ 40 ° C, the reaction time was 2 hours.

[0035] (4) Separation of titanium plaster: The reaction slurry sedimentation, the lower slurry was filtered and removed, and washed with 10% lime water to give 68.7 g of titanium plaster, and analyzed the water ...

Embodiment 3

[0037] Titanium white waste acids from Annada Titanium Co., Ltd., main ingredients 2 SO 4 The content was 23.93%.

[0038] The steps employed in the present invention are as follows:

[0039] (1) Preparation of seed crystals: Take 200 g of titanium white waste acid and retain 200g neutralization (containing 20 to 30%);

[0040] (2) Crystal modified agent control: 5% crystalline type modified dodecyl benzene sulfonate 3g is added to the reaction temperature of 30 to 40 ° C, stirring.

[0041] (3) Titanium white waste acid neutralization: Taking limestone as a neutralizing agent and titanium white waste acid in progress, limestone powder is slowly added, add 20% limetric pulp 215g, pH 1.3, reaction temperature 30 ~ 40 ° C, the reaction time was 2 hours.

[0042] (4) Separation of titanium plasma: The reaction slurry sedimentation, the lower slurry was filtered and removed, and washed with 10% lime water to give 85 g of titanium plaster, and the moisture content was 16.6%. The filter...

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Abstract

The invention relates to a method for controlling the water content of titanium gypsum. The present invention prepares seed crystals and adds a crystal form modifier before the neutralization reaction of titanium white waste acid, and by controlling the reaction conditions of each step, the water content of titanium gypsum is reduced from 45 to 50% to below 20%, so that the titanium gypsum can be used It is used in the production of cement retarder, and a new way has been developed for the comprehensive utilization of titanium dioxide waste acid and energy saving and emission reduction. The method of the invention is applicable to the control of the water content of the gypsum produced by the neutralization treatment of various dilute acids containing sulfuric acid (including waste acid and waste water).

Description

Technical field [0001] The invention belongs to the field of titanium white powder production, and in particular, to a method of controlling the water content of titanium plasters. Background technique [0002] Titanium white powder is an important chemical raw material, which mainly uses H in China. 2 SO 4 Method for production. In the process of producing titanium powder in sulfuric acid, a titanium white waste acid of about 4 to 5 tons will be produced for 1 ton of titanium white powder. For example, Annada Titanium Co., Ltd. has an 80 kt / a titanium white powder production device, which produces a titanium white waste acid of about 400,000 tons of 20%, which is concentrated and partially used for copper. Guanshan company produces phosphate fertilizer, but there are still 500 tons (titanium sulfuric acid content in titanium white waste acid), and then reach a standard discharge, which produces more than 200,000 tons of wet bases every year. (Water content is 45 ~ 50%) Two-wat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46C04B22/14
CPCC01F11/46C01P2006/82C04B22/146
Inventor 钱懂得潘建罗自力丁雪苹
Owner TONGLING CHEM IND GRP