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Method for preparing high-strength α-hemihydrate titanium gypsum from industrial waste dihydrate titanium gypsum

A technology of industrial waste and titanium gypsum, which is applied in the field of preparing high-strength α-titanium hemihydrate, can solve the problems affecting the crystallization process of α-titanium hemihydrate, low purity and small crystal size of dihydrate titanium gypsum, and achieve Eliminate the possibility of secondary hydration, promote the comprehensive utilization of high value and high quantity, and the effect of uniform size

Inactive Publication Date: 2016-01-20
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conventional hydrothermal method has obstacles in the preparation of α-titanium gypsum hemihydrate, mainly because of the low purity of titanium gypsum dihydrate and high content of impurities, especially iron and titanium, which greatly affect the crystallization process of α-titanium hemihydrate gypsum , leading to small crystal size, imperfect morphology and poor product quality of products produced by conventional hydrothermal methods

Method used

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  • Method for preparing high-strength α-hemihydrate titanium gypsum from industrial waste dihydrate titanium gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1. Put the dihydrate titanium gypsum in an oven at 80°C and dry it to constant weight, take it out and grind it finely, pass it through a 200-mesh sieve, take 1000 parts and add it to a high-pressure reactor, add an appropriate amount of water, and make the mass percentage concentration of 50% dihydrate titanium gypsum slurry, add 1.1% crystal modifier of dihydrate titanium gypsum weight, wherein 1 part of sodium citrate, 10 parts of aluminum sulfate, and adjust it with 2mol / L hydrochloric acid or 2mol / L sodium hydroxide solution When the pH is 4.5, stir and feed 0.4MPa nitrogen, then heat up to 140°C, stir at 60 rpm, dehydrate and crystallize at constant temperature and pressure for 3 hours, open the vent valve to release the pressure to within 0.1MPa, continue heating, keep The temperature in the kettle is 100°C, after complete drying, short hexagonal prism crystals such as figure 1 As shown, after grinding to 10-50μm, 10-20μm accounts for 25%, 20-40μm account...

Embodiment 2

[0043] Example 2: Put the dihydrate titanium gypsum in an oven at 80°C and dry it to constant weight, take it out and grind it finely, pass it through a 200-mesh sieve, take 1000 parts and add it to the high-pressure reactor, add an appropriate amount of water, and make the mass percentage concentration of 50% dihydrate titanium gypsum slurry, add 1.1% crystal modifier of dihydrate titanium gypsum weight, wherein 1 part of sodium citrate, 10 parts of aluminum sulfate, and adjust it with 2mol / L hydrochloric acid or 2mol / L sodium hydroxide solution When the pH is 1.0, stir and feed 0.5MPa nitrogen, then raise the temperature to 140°C, the stirring speed is 60 rpm, dehydrate and crystallize at constant temperature and pressure for 3 hours, open the vent valve to release the pressure to within 0.1MPa, continue heating, keep The temperature in the kettle is 110°C. After complete drying, grind to 10-50μm, 10-20μm accounts for 25%, 20-40μm accounts for 60%, and 40-50μm accounts for 15...

Embodiment 3

[0044] Example 3: Put the dihydrate titanium gypsum in an oven at 80°C and dry it to constant weight, take it out and grind it finely, pass it through a 200-mesh sieve, take 1000 parts and add it to the high-pressure reactor, add an appropriate amount of water, and make the mass percentage concentration of 50% dihydrate titanium gypsum slurry, add 1.1% crystal modifier of dihydrate titanium gypsum weight, wherein 1 part of sodium citrate, 10 parts of aluminum sulfate, and adjust it with 2mol / L hydrochloric acid or 2mol / L sodium hydroxide solution The pH is 4.5, stir and feed 0.4MPa nitrogen, then raise the temperature to 140°C, the stirring speed is 60 rpm, dehydrate and crystallize at constant temperature and pressure for 3 hours, open the vent valve to release the pressure to below 0.1MPa, and continue heating. Keep the temperature in the kettle at 120°C, after complete drying, grind to 10-50μm, 10-20μm accounts for 25%, 20-40μm accounts for 60%, and 40-50μm accounts for 15%....

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Abstract

The invention provides a method for preparing high-strengthalpha-semihydratetitanium gypsum with industrial wastedihydratetitanium gypsum. The method comprises the steps as follows: placing the industrial wastedihydratetitanium gypsum of titanium dioxideproduced with a sulfuric acid method in a drying oven to dry thedihydratetitanium gypsum to the constant weight, grinding the dihydratetitanium gypsum to be fine, and adding water to prepare the dihydratetitanium gypsum into slurry; adding a compound crystalloblastic agent to obtain a suspension liquid, adjusting the pH of the suspension liquid with an acid or an alkali, adding the suspension liquid into a reaction kettle, feeding an inert gas of certain pressure into thesuspension liquidwhile stirring, heating the reaction kettle to the temperature of 120-160 DEG C, and performing constant-temperature, constant-pressure and low-speed stirring to realize dehydration crystallization; turning on a vent valve to relieve the pressure to be within 0.1 MPa, continuing heating, keeping the temperature in the kettle to be in a range of 100-150 DEG C, after complete drying, taking out and grinding the material to be fine, mixing the material according to certain grading so as to obtain thehigh-strengthalpha-semihydratetitanium gypsum with the drycompressive strength higher than 60 MPa. According to the method, the industrial byproductdihydratetitanium gypsum is recycled, the method is simple in technology, low in cost and high in efficiency, and the alpha-semihydratetitanium gypsum is excellent in crystal appearance, short-hexagonal-prism-shaped, uniform in size, high in drycompressive strength and excellent in product quality.

Description

technical field [0001] The invention belongs to the technical field of ceramic preparation, and in particular relates to a method for preparing high-strength alpha-hemihydrate titanium gypsum from industrial waste dihydrate titanium gypsum. Background technique [0002] Titanium gypsum is a waste residue with dihydrate titanium gypsum as the main component, which is generated by adding lime and other reactions in the process of producing titanium dioxide for the treatment of acidic wastewater. In recent years, with the rapid development of my country's economy, the discharge of industrial titanium gypsum has increased rapidly, reaching 10 million tons per year, and the resulting accumulation of titanium gypsum waste residue ranks first in the world. Although a lot of manpower and material resources have been invested in the elimination of titanium gypsum pollution in China, landfill and dumping are mainly used for disposal, which not only occupies a large amount of land, but...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/26
Inventor 赵辉任小明蒋涛张刚申张群朝周威董兵海郝同辉金纯莫甲新江莉莉黄正刚
Owner HUBEI UNIV
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