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Resource utilization method for red gypsum produced by means of sulfuric acid process of titanium dioxide factory

A titanium dioxide factory and red gypsum technology, which is applied in the field of red gypsum resource utilization, can solve the problems of white spots on the surface of products, large heat release, too fast condensation, etc., and achieves simple and easy technology and equipment flow, and low requirements for equipment materials. , the effect of easy operation

Inactive Publication Date: 2012-10-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesium oxychloride cement also has significant shortcomings: (1) it is easy to absorb moisture and return to halogen in a humid environment; The product is warped and deformed; (3) The hardened body swells and cracks, showing large heat release, rapid condensation, rapid early strength development and low later strength, and swells and cracks into fragments after being exposed to water; (4) Frost and white, White spots or pinpoint-sized tiny white spots appear on the surface of the product, and last for a long time

Method used

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  • Resource utilization method for red gypsum produced by means of sulfuric acid process of titanium dioxide factory
  • Resource utilization method for red gypsum produced by means of sulfuric acid process of titanium dioxide factory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Experimental ingredients: Liaoning Haicheng magnesite light-burned powder (passed through a 150-mesh sieve, the composition is shown in Table 2) 400g, red gypsum 560g (mass ratio to light-burned powder is 1.4), magnesium chloride hexahydrate 210g, water 120ml.

[0050] Experimental conditions: The molar ratio of magnesium oxide, magnesium chloride and water in magnesite lightly burned powder is 6.5:1:18, room temperature (about 25°C), stirring speed 150rpm, reaction time about 5-10min, using ISO cement mortar triplex For mold testing, the curing molding time is 24 hours, the curing time is 3 days, and the water resistance test time is 28 days.

[0051] Experimental results: According to the strength inspection standard of cement products, the flexural strength is 2.10Mpa and the compressive strength is 4.5Mpa. After the water resistance test, the flexural strength was determined to be 1.81Mpa, and the compressive strength was 3.87Mpa.

Embodiment 2

[0053] Experimental ingredients: Liaoning Haicheng magnesite light-burned powder (passed through a 150-mesh sieve, the composition is shown in Table 2) 400g, red gypsum 480g (mass ratio to light-burned powder is 1.2), magnesium chloride hexahydrate 210g, water 120ml.

[0054] Experimental conditions: The molar ratio of magnesium oxide, magnesium chloride and water in magnesite lightly burned powder is 6.5:1:18, room temperature (about 25°C), stirring speed 150rpm, reaction time about 5-10min, using ISO cement mortar triplex For mold testing, the curing molding time is 24 hours, the curing time is 3 days, and the water resistance test time is 28 days.

[0055] Experimental results: According to the strength inspection standard of cement products, the flexural strength is 3.90Mpa and the compressive strength is 13.7Mpa. After the water resistance test, the flexural strength was determined to be 3.52Mpa, and the compressive strength was 12.46Mpa.

Embodiment 3

[0057] Experimental ingredients: Liaoning Haicheng magnesite light-burned powder (passed through a 150-mesh sieve, the composition is shown in Table 2) 400g, red gypsum 400g (mass ratio to light-burned powder is 1.0), magnesium chloride hexahydrate 210g, water 120ml.

[0058] Experimental conditions: The molar ratio of magnesium oxide, magnesium chloride and water in magnesite lightly burned powder is 6.5:1:18, room temperature (about 25°C), stirring speed 150rpm, reaction time about 5-10min, using ISO cement mortar triplex For mold testing, the curing molding time is 24 hours, the curing time is 3 days, and the water resistance test time is 28 days.

[0059] Experimental results: According to the strength inspection standard of cement products, the flexural strength is 8.30Mpa and the compressive strength is 24.2Mpa. After the water resistance test, the flexural strength was determined to be 7.67Mpa, and the compressive strength was 22.38Mpa.

[0060] The wall material produ...

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Abstract

The invention provides a resource utilization method for red gypsum produced by means of a sulfuric acid process of a titanium dioxide factory. The method is characterized in that the red gypsum produced by means of the sulfuric acid process of the titanium dioxide factory serves as a raw material, magnesium oxychloride cement is combined to modify and prepare a wall body material. The characteristics of gelatinization and high strength of the magnesium oxychloride cement are utilized, and the red gypsum is added to be modified so as to achieve resource utilization of the red gypsum and eliminate environmental hidden danger. A main ingredient of the red gypsum is calcium sulphate dehydrate. In addition, the content of impurities including iron, aluminum, silicon and the like is high, density degree of products can be improved by adding the magnesium oxychloride cement in preparation, and further abrasive resistance and strength of the products are improved. Good water-resistance effect can be obtained. The wall body material prepared by the red gypsum produced by means of the sulfuric acid process of the titanium dioxide factory is not intervened by strong acid and strong base, needs normal pressure and temperature and has not high requirements for device materials. The utilization rate of the raw material is high, the process flow is simple, and the method is a novel red gypsum resource utilization method.

Description

technical field [0001] The invention relates to a method for resource utilization of red gypsum, in particular to a method for utilizing red gypsum produced by a sulfuric acid process in a titanium dioxide factory as a raw material, combined with modification of magnesium oxychloride cement to prepare wall materials, thereby realizing resource utilization of red gypsum. technical background [0002] The sulfuric acid titanium dioxide production process is the traditional production process of titanium dioxide. Because a large amount of waste acid and acidic wastewater are produced during the process, limestone, quicklime or carbide slag must be used to neutralize it, resulting in a large amount of titanium gypsum. Because the gypsum contains It is rich in iron and is red, so it is also called red gypsum. In recent years, with the rapid development of my country's titanium dioxide industry, the annual output of red gypsum is increasing (my country currently produces millions ...

Claims

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Application Information

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IPC IPC(8): C04B28/32C04B22/14
Inventor 王云山杨刚张金平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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