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The production of high-grade synthetic rutile from low-grade titanium-bearing ores

An ore, low-level technology, used in the field of two-stage leaching

Inactive Publication Date: 2016-12-14
FFK TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another noteworthy drawback of each of the aforementioned methods is that they 2 Requires a purification step of leaching the solution prior to recovery, by reducing existing ferric iron to its ferrous state, or by a separate solvent extraction step to recover titanium in a purer form

Method used

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  • The production of high-grade synthetic rutile from low-grade titanium-bearing ores
  • The production of high-grade synthetic rutile from low-grade titanium-bearing ores
  • The production of high-grade synthetic rutile from low-grade titanium-bearing ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] [Example 1] Low-grade ore (containing 11% TiO2) from Magpie deposits in Quebec, Canada 2 ) Dissolution and removal of insoluble substances.

[0047] The first stage:

[0048] a. The low-grade ore is finely ground to 200 mesh, wherein preferably 50% of the range and more preferably 80% of the low-grade ore pass through -200 mesh respectively.

[0049] b. The first leaching reaction is carried out by contacting the low grade ore with hydrochloric acid at a concentration in the range of 35%-40%, using an ore to acid ratio between 2 and 2.5. Due to the pulp concentration and fine particle size determination, only slight agitation is required to prevent settling. This first leaching reaction dissolves the magnetite in about an hour. The temperature is kept at 60°C-70°C.

[0050] c. The mother liquor currently containing only 2%-4% HCl is preferably replaced by concentrated acid on hand to dissolve ilmenite and titanium present in the ore to obtain a slurry. The slurry i...

Embodiment 2

[0056] [Example 2] Precipitation of TiO(OH) by distillation of unreacted acid 2 .

[0057] second stage:

[0058] The two leaching reactions discussed in Example 1 consumed more than half of the available acid. Recovery of free unreacted acid was performed by mixing the two filtered solutions from The first leaching reaction and the second leaching reaction are discussed in Example 1. About 90% of the titanium chloride precipitates as hydrate. Another filtration step removes residual saturated liquid.

[0059] Chloride crystals are dissolved using a minimal amount of dilute acid, leaving insoluble TiO(OH) in the form of a fine granular solid 2 , which is easy to filter. After the calcination process, the advanced synthetic rutile contains TiO 2 The amount is 95%-98% TiO 2 range, which meets the requirements for synthetic rutile concentrates.

Embodiment 3

[0060] [Example 3] Recovery of combined hydrochloric acid and production of iron or iron oxide.

[0061] The third stage:

[0062] There are several possible ways to recover the iron and bound hydrochloric acid including:

[0063] 1. Reduction of ferric chloride with iron and partial evaporation of the solution to crystallize hydrated ferrous chloride, which can then be reduced to metal by hydrogen to produce iron powder.

[0064] 2. Send the chloride solution into the spray reactor under high temperature and hydrogen atmosphere. Production of iron powder and simultaneous regeneration of hydrochloric acid and evaporated water. The iron produced contains 0.4% TiO 2 and 1%-3.5% Cr 2 o 3 .

[0065] 3. Feed the chloride solution into a spray reactor where high temperature hydrolysis in a slightly oxidizing atmosphere produces iron oxides and hydrochloric acid.

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Abstract

The present invention relates, first, to a two-stage leaching process using concentrated hydrochloric acid wherein ground ore is leached with two separate quantities of hydrochloric acid at different temperatures. Second, the invention relates to a one-step leaching process using concentrated HCl and a fixed acid to ore ratio to prevent hydrolysis of titanium. Afterwards the dissolved titanium is precipitated from the filter liquor by hydrolysis and the still soluble iron chlorides are then optionally subjected to oxyhydrolysis to recover iron oxide and HCl. The process was developed for low-grade ores (under 12% Ti02), and can naturally be applied advantageously to higher grade titanium-bearing ores, that upgrades a variety of inferior quality titanium-iron ores into premium titanium concentrate and iron oxide products.

Description

technical field [0001] The present invention generally relates to a two-stage leaching process using concentrated hydrochloric acid to upgrade a wide variety of low quality ilmenite ores to high quality titanium concentrate and iron oxide products. Background technique [0002] Advanced synthetic rutile is an excellent feed for fluidized bed chlorination, and it is also a good raw material for pigments or titanium sponges. [0003] The gradual depletion of rutile-type concentrates has prompted research into new methods of producing improved concentrates from low-grade ores, which can be advantageously used as an alternative. Many of the methods currently being investigated by industry preferentially remove the iron either chemically or physically, leaving the titanium in the unwanted gangue material. The QIT method is an example of this escalation. In this method, 40% TiO 2 The ilmenite ore is upgraded to 70% TiO after high temperature reaction 2 slag. These methods pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/10B01D3/00C01B7/07C22B3/22C01G23/047C22B34/12
CPCC01G23/053C01G49/10C01G23/0536C01G31/003C01G31/02C01G49/06C01G51/003C01G51/04C01B7/035C01B7/0712Y02P10/20C22B34/22C22B34/32B01D3/36
Inventor 福阿德·F·卡迈勒丁
Owner FFK TECH INC
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