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Treating and using method for titanium-containing blast furnace slag

A technology for waste acid treatment and blast furnace slag, applied in chemical instruments and methods, magnesium sulfate, aluminum sulfate, etc., can solve the problems of difficult product quality, high cost, and high energy consumption in the extraction process, so as to reduce production costs and alleviate Huge pressure to achieve the effect of resource utilization

Inactive Publication Date: 2016-01-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN102698737A has invented a method for preparing SCR flue gas denitrification catalyst from titanium-containing blast furnace slag. The titanium-containing blast furnace slag is subjected to acid leaching and hydrolysis to obtain metatitanic acid, which is further loaded with tungsten and vanadium to obtain a vanadium-tungsten-titanium SCR denitrification catalyst. This method realizes the effective utilization of valuable elements in blast furnace slag, and solves the problems of difficult separation and purification of titanium dioxide products extracted from blast furnace slag and difficult product quality standards
But the above TiO 2 The processes all use high-concentration sulfuric acid leaching, and the use value of the residue after leaching is low, so it is difficult to form a high-value utilization process
[0012] The patents in the above various utilization methods are technically feasible, but most of them are based on Ti and TiO 2 Extraction, the separation and purification process requires strict requirements, resulting in high energy consumption and high cost in the extraction process

Method used

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  • Treating and using method for titanium-containing blast furnace slag
  • Treating and using method for titanium-containing blast furnace slag
  • Treating and using method for titanium-containing blast furnace slag

Examples

Experimental program
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Effect test

Embodiment 1

[0046] After mixing 1000g of titanium-containing blast furnace slag (20-50 mesh) (see attached table 1 for composition), 5kg (20% mass concentration of waste sulfuric acid), it was added to a 10L ball mill tank, and corundum balls were added for ball milling reaction. The ball milling speed is controlled to be 120 rpm, and the ball milling time is 600 min. After the reaction is completed, the slurry is poured into a centrifuge tank for high-speed centrifugation and washed with waste sulfuric acid to obtain leachate and solid residue.

[0047] After the leaching liquid was concentrated to 2.5L at 60°C and -0.8atm (TiO 2 Equivalent concentration 50g / L), warming up to 110 ℃, at 30mL / L (with H 2 o 2 Oxygen was introduced into the filter press for oxidative hydrolysis reaction for 10 hours. After the liquid-solid separation was carried out by a small filter press, it was washed twice with dilute sulfuric acid and ammonia water respectively, maintained at 80°C for 1h and 100°C for...

Embodiment 2

[0057] After mixing 1000g of titanium-containing blast furnace slag (20-50 mesh) (see attached table 1 for composition), 50kg (10% waste sulfuric acid in mass concentration), put it into a 10L ball mill tank, add corundum balls, and carry out ball milling reaction. The ball milling speed is controlled to be 30 rpm, and the ball milling time is 600 min. After the reaction is completed, the slurry is poured into a centrifuge tank for high-speed centrifugation and washed with waste sulfuric acid to obtain leachate and solid residue.

[0058] After the leaching liquid was concentrated to 8.33L at 30°C and -0.5atm (TiO 2 Equivalent concentration 15g / L), under the condition of raising the temperature to 90°C, add H at 60mL / L 2 o 2, carry out oxidative hydrolysis reaction for 20 hours, after liquid-solid separation by small filter press, wash twice with dilute sulfuric acid and ammonia water respectively, maintain at 80°C for 2h, maintain at 100°C for 2h, and then dry at 150°C to o...

Embodiment 3

[0061] After mixing 1000g of titanium-containing blast furnace slag (20-50 mesh) (see attached table 1 for composition), 1.67kg (60% mass concentration of waste sulfuric acid), put it into a 10L ball mill tank, add corundum balls, and carry out ball milling reaction. The ball milling speed was controlled to be 1000 rpm, and the ball milling time was 15 minutes. After the reaction is completed, the slurry is poured into a centrifuge tank for high-speed centrifugation and washed with waste sulfuric acid to obtain leachate and solid residue.

[0062] After the leaching liquid was concentrated to 1.25L at 70°C and -0.01atm (TiO 2 Equivalent concentration 100g / L), add nitric acid (with H 2 o 2 10mL / L), carry out oxidative hydrolysis reaction for 5 hours, after liquid-solid separation by small-scale filter press, wash twice with dilute sulfuric acid and ammonia water respectively, maintain 1.5h at 80°C, 1.5h at 100°C, and then store at 120°C Dry to obtain a composite filter cake ...

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Abstract

The invention belongs to the field of solid waste resource utilization. The treating and using method for titanium-containing blast furnace slag provided by the invention comprises: adding titanium-containing blast furnace slag into waste dilute sulfuric acid to be leached and separating the mixture to obtain a filter residue and a leaching liquid; after controlling the normal concentration of TiO2 in the leaching liquid through reduction vaporization, further carrying out oxidative hydrolysis reaction; filtering, washing and drying the hydrolyzed product to obtain a metatitanic acid-silicic acid compound; further loading tungsten on the product; and calcining the product to obtain titanium tungsten silicon powder; carrying out simple suspended separation and drying and roasting on the ball-milled filter residue to obtain a calcium sulfate-SiO2 composite whisker material; and crystallizing and separating the hydrolyzed liquid to obtain an aluminum sulfate chemical. The method not only realizes effective use of titanium, silicon, calcium and aluminum of blast furnace slag, and solves the problem that a titanium product extracted from the blast furnace slag is hard to separate and purify and the product quality is hard to reach the standard, but also greatly lowers the titanium-extracting cost, reduces the energy consumption, and realizes high value utilization of calcium and silicon.

Description

technical field [0001] The invention belongs to the field of resource utilization of solid waste, in particular, the invention relates to a treatment and utilization method of titanium-containing blast furnace slag waste acid. The invention belongs to a new process for high-value utilization of titanium-containing blast furnace slag waste acid treatment, including nano-titanium-silicon carrier for preparing SCR flue gas denitrification catalyst, which can be used as papermaking, heat preservation, refractory and heat insulation materials, silicon-containing calcium sulfate whiskers and as a flocculant Aluminum sulfate and other chemical raw materials. Background technique [0002] The Panxi region of my country is rich in vanadium-titanium magnetite resources. Vanadium-titanium magnetite is used as the raw material for blast furnace smelting. After beneficiation, about 50% of titanium enters the iron concentrate. After blast furnace smelting, almost all titanium enters the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/40C01F7/74B01J27/049D21H21/18D21H17/67
CPCY02P20/10
Inventor 余剑郭凤张姝甘丽娜许光文
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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