Process of producing calcium sulfate crystal whiskers from chloride-containing wastewater generated in chloride process titanium dioxide production

A technology of calcium sulfate whisker and chloride method, which is applied in chemical instruments and methods, calcium/strontium/barium sulfate, single crystal growth, etc., can solve the problem that titanium white chlorine-containing wastewater is not economically feasible and has economic benefits Deal with technology and other issues to achieve the effect of improving the level of clean production, simple process and environmental friendliness

Active Publication Date: 2014-06-04
中信钛业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no economically feasible and economically beneficial treatment

Method used

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  • Process of producing calcium sulfate crystal whiskers from chloride-containing wastewater generated in chloride process titanium dioxide production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] ①. Collect, settle, purify and filter the wastewater containing calcium chloride (mainly calcium chloride and sodium chloride) from chlorinated titanium white to make the Ca in the wastewater 2+ content ≥ 50g / L, Cl - content of ≥100g / L, content of ΣFe≤20ppm, Pb 2+ 、 Bi 3+ 、Cd 2+ content of ≤5ppm, store for future use;

[0023] ②, will produce vanadium pentoxide containing Na 2 SO 4 After the waste water is collected, settled, purified and filtered, the SO in the waste water 4 2- The content of ≥50g / L, the content of ΣFe≤20ppm, Cr 6+ content of ≤5ppm, store for future use;

[0024] ③. Ca in the solution obtained according to step ① 2+ and SO in the solution obtained in step ② 4 2- Molar ratio 1:1.5 Mix step ① and step ② solution to react, stir, heat to 80°C, add sulfuric acid to adjust to pH = 4; add magnesium chloride simultaneously and make accelerator, the add-on of described magnesium chloride is 3% of product calcium sulfate theoretical weight, and the r...

Embodiment 2

[0031] ①. Collect, settle, purify and filter the wastewater containing calcium chloride (mainly calcium chloride and sodium chloride) from chlorinated titanium white to make the Ca in the wastewater 2+ content ≥ 50g / L, Cl - content of ≥100g / L, content of ΣFe≤20ppm, Pb 2+ 、 Bi 3+ 、Cd 2+ content of ≤5ppm, store for future use;

[0032] ②. Dissolve Glauber's salt, a by-product of the production of red alum sodium, in vanadium pentoxide wastewater, settle, purify, and Cr 6+ After reduction to chromium hydroxide and filtration, the SO in the wastewater 4 2- The content of ≥100g / L, the content of ΣFe≤20ppm, Cr 6+ content of ≤5ppm, store for future use;

[0033] ③. Ca in the solution obtained according to step ① 2+and SO in the solution obtained in step ② 4 2- Molar ratio 1:1.15 Mix step ① and step ② solution to react, stir, heat to 60°C, add sulfuric acid to adjust to pH = 2; adding magnesium chloride simultaneously is made accelerator, and the add-on of described magnesi...

Embodiment 3

[0040] ①. Collect, settle, purify and filter the wastewater containing calcium chloride (mainly calcium chloride and sodium chloride) from chlorinated titanium white to make the Ca in the wastewater 2+ content ≥ 50g / L, Cl - content of ≥100g / L, content of ΣFe≤20ppm, Pb 2+ 、 Bi 3+ 、Cd 2+ content of ≤5ppm, store for future use;

[0041] ②. The subsidence waste liquid from the production of Haibo contains the main amount of Na 2 SO 4 , the rest Na 2 S 2 o 3 、Na 2 SO 3 , first put S 2 o 3 -2 , SO 3 -2 Oxidation to SO 4 2- Finally, after collecting, settling, purifying and filtering, the SO in the wastewater 4 2- The content of ≥200g / L, the content of ΣFe≤20ppm, Cr 6+ content of ≤5ppm, store for future use;

[0042] ③. Ca in the solution obtained according to step ① 2+ and SO in the solution obtained in step ② 4 2- The molar ratio is 1:1.25. Mix the solution of step ① and step ② for reaction, stir, heat to 100°C, add sulfuric acid to adjust the pH = 5; add ma...

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Abstract

The invention relates to a process of producing calcium sulfate crystal whiskers from chloride-containing wastewater generated in chloride process titanium dioxide production. The process comprises the following steps: respectively colleting, clarifying, purifying and filtering chloride-containing wastewater generated in chloride process titanium dioxide production and sodium sulfate-containing wastewater, mixing for reacting, stirring, heating and adding sulfuric acid to adjust the pH value; meanwhile, adding magnesium chloride as a growth substance; placing in a crystallization tank to age and crystallize to obtain calcium sulfate crystals; filtering, and adding H2SO4 to be buffered and heated to be boiled; thermally filtering and washing by deionized water at the same time to obtain calcium sulfate crystal whiskers; feeding to a fluidized bed dryer to be dried and hydrated, and packaging to obtain anhydrous calcium sulfate crystal whiskers. The process is simple and low in cost, and is suitable for industrialized production, so that wastewater is comprehensively utilized.

Description

technical field [0001] The present invention relates to a process for producing calcium sulfate whiskers from chlorine-containing wastewater from chlorinated titanium white, in particular to a co-production process for producing calcium sulfate whiskers from chlorine-containing wastewater from chlorinated titanium white while recovering industrial sodium chloride . Background technique [0002] Calcium sulfate whiskers have excellent mechanical properties, good compatibility, excellent smoothness, and good regeneration performance. They are mainly used in papermaking, added components of composite materials, friction materials, environmental engineering filtration, asphalt modification and Improve the adhesion, temperature resistance and insulation of coatings and paints. At present, the production method of calcium sulfate whiskers is to use gypsum as the raw material and grow in the form of single crystals through artificial control. It is a fibrous (whisker-like) single ...

Claims

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Application Information

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IPC IPC(8): C30B7/14C30B29/22C30B29/62C01F11/46
Inventor 齐牧崔传海刘长河韩艳芝任彤郭一冰杨洪岩崔小莉李继奎
Owner 中信钛业股份有限公司
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