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Comprehensive utilization method of high titanium slag

A high-titanium type, slag technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of large alkali consumption, high energy consumption, high energy consumption, etc., to reduce the cost of acid consumption, improve production efficiency and Economic benefits, the effect of improving economic benefits

Active Publication Date: 2015-01-28
攀枝花市德信科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although these two methods of titanium extraction reduce TiO 2 The loss of resources, but there are still many deficiencies. For example, the wet method of titanium extraction requires high-temperature melting reaction during alkali solution treatment, which makes the consumption of alkali larger and the energy consumption of the reaction process is larger; while the fire method of titanium extraction The disadvantages are that the reaction requires harsh conditions such as high temperature and high energy consumption, and it is impossible to effectively recover beneficial elements such as Fe, Al, and Mg in titanium-containing blast furnace slag.
[0008] However, in the prior art, there is no method that can comprehensively utilize various effective components in high-titanium slag

Method used

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Experimental program
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Effect test

Embodiment 1

[0087] A comprehensive utilization method of high-titanium slag, such as figure 1 shown, including the following steps:

[0088] (1) Pretreatment: the slag is processed to obtain the slag powder after iron removal;

[0089](2) The first stage of leaching: the slag powder after iron removal is pickled with dilute hydrochloric acid, and the solid-liquid separation (sedimentation, filtration) after the acid leaching obtains the first-level filter residue and the first-level filtrate;

[0090] (3) The second stage of leaching: after the primary filter residue is dried, acidolysis is carried out with dilute sulfuric acid, and solid-liquid separation (sedimentation, filtration, pressure filtration, etc.)

[0091] (4) Titanium dioxide production: black titanium solution is processed to produce titanium dioxide.

[0092] Because dilute hydrochloric acid was used for acid leaching first, the structure of slag particles changed greatly after immersion in dilute hydrochloric acid. Due ...

Embodiment 2

[0097] On the basis of embodiment 1, further provide the preferred technique when adopting dilute sulfuric acid to carry out acidolysis:

[0098] Dilute sulfuric acid preferably adopts 40%-45% (mass fraction) H 2 SO 4 , more preferably 40% (mass fraction) H 2 SO 4 ;

[0099] The second stage leaching is preferably carried out in two steps:

[0100] One-time leaching operation condition and method: sulfuric acid consumption: suppose ore weight is W, and the concentration of dilute sulfuric acid is 40% (mass fraction), then the dilute sulfuric acid consumption is: 1.4w * 80% ÷ 40%=2.8w. (Note: 1.4T of concentrated sulfuric acid with a concentration of 97% is required for each 1T of slag, and the amount of dilute sulfuric acid used in the first leaching is 80% of the total amount of dilute sulfuric acid used in the second stage leaching)

[0101] Firstly add the primary filter residue into the enamel reaction kettle, then slowly add the dilute sulfuric acid solution (do not ...

Embodiment 3

[0109] Further, on the basis of Example 1 or Example 2, the steps for processing the black titanium solution to prepare titanium dioxide are given:

[0110] Add saturated ammonium sulfate solution to the black titanium solution, preferably add 20 liters of saturated ammonium sulfate solution per 1m3 black titanium solution, to precipitate crude aluminum ammonium sulfate from the solution, remove the crude aluminum ammonium sulfate, and then heat, concentrate and hydrolyze the solution , and then separated and washed with water to obtain crude metatitanic acid and the final filtrate. The final filtrate contains the remaining waste acid from acidolysis. The obtained final filtrate is concentrated and regenerated and then added to the acid hydrolysis step for recycling. Titanium acid is used as raw material to prepare titanium dioxide.

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Abstract

The invention discloses a comprehensive utilization method of high titanium slag in the slag treatment technology. The method comprises the following steps: firstly, carrying out acid leaching by using diluted hydrochloric acid; then, carrying out acidolysis by using dilute sulphuric acid, wherein the leaching rate is improved; using a black titaniferous liquid after acidolysis to prepare titanium dioxide; settling Fe(OH)3, Al(OH)3, Mg(OH)2 and Ca(OH)2 from a primary filtrate obtained by acid leaching and recovering sodium chloride; and using Si, Mg and Ca in slag to prepare an Si-Ca-P-Mg composite fertilizer. The method disclosed by the invention is extremely low in acid consumption of acid which is recycled, various effective components of high titanium slag can be comprehensively utilized, and factors in many aspects such as environment friendliness, technology and economical benefit are taken into consideration. The slag is low in cost, and titanium, ferrum, aluminum, magnesium, calcium, silicon, sodium chloride and the like can be comprehensively recovered, so that the economic benefit is remarkable, the long-term pendent problem on utilization of high titanium slag is solved, the land for slag is saved, the environmental pollution is reduced, wastes are turned into wealth, and the high titanium slag has a good social benefit.

Description

technical field [0001] The invention relates to the technical field of slag treatment, in particular to a comprehensive utilization method of high-titanium slag. Background technique [0002] Panzhihua high-titanium slag is a kind of slag unique to China. It has a large amount of slag discharge and a unique structure. Its main mineral composition is listed in the following table: [0003] [0004] It can be seen from the table that pantitanium diopside is the main component of blast furnace slag. It is an irregular particle with a diameter generally between 7-250 μm. Perovskite is the second main component with finer particles and a particle size of between Between 10-40μm, other minerals of blast furnace slag are embedded between the two. The percentages of the various main components of this slag are (%): [0005] CaO24-30, SiO 2 22-26, A1 2 o 3 12-14, MgO8-10, Fe 2 o 3 3-5, MnOl, TiO 2 20-25, S0.2-0.4, K 2 O<l, Na 2 O<l. [0006] The titanium-containin...

Claims

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Application Information

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IPC IPC(8): C01G23/053
CPCC01G23/053
Inventor 陆世强
Owner 攀枝花市德信科技有限公司
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