JPS6311057B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention removes impurities from titanium ore through a series of mechanical operations, reducing the titanium dioxide content to levels that meet those required for direct commercialization or production of raw materials for more complex enrichment processes. Increasing the amount of titanium dioxide (TiO ₂ )
It concerns a beneficiation method for titanium ore, which essentially consists of targeting products with high content. The worldwide shortage of high-grade titanium ore has led to intensive research to obtain rich concentrate from poor ore. The use of poor ore by many consumers has resulted in the production of highly polluting effluents that run counter to increasingly strict regulations against pollution.
This has created an increased need for consumers to search for high grade concentrates that reduce the mentioned disadvantages to a minimum. A number of existing patents relating to the beneficiation of titanium ores use ilmenite, an abundant ore, generally in the TiO ₂ grade varying from 45 to 58%. On the other hand, the ilmenite concentration process produces polluting effluents that simply transfer the pollution problem from the consumer to the producer. The significance of the novel method for beneficiation of titanium ore to obtain a concentrate with high TiO ₂ content lies in the fact that in the ore titanium is found as an oxide (TiO ₂ ) and its concentration is The basis for this is the use of ores that are not titanates, which require chemical processes. In the novel process of the present invention, mechanical manipulation is required and the production of emissions is substantially eliminated. The invention presented herein satisfies the consumer demand for obtaining products with high TiO ₂ content, and this further ensures that during its operation it does not run counter to increasingly stringent pollution control laws. Make it. According to the invention, the raw materials used in the new process are mainly, but not exclusively, titanium, due to the presence of silica and compounds of iron, calcium, magnesium, phosphorus, aluminum, sodium and potassium. It is an ore that appears as an impure oxide. The ore is first brought to a disaggregation stage through scrubbing and then subjected to sliming and the fractions above 0.105 mm are recovered. The sections are collected with a maximum dimension of 18 mm and subjected to low-intensity magnetic sorting, during which magnetite is removed. Non-magnetic split part is 0.841mm in sealed circuit
crushed to reach . Fines are screened out with flat, inclined and fixed screens or equivalent equipment that closes the circuit. The uniformly ground material is then aged with an anionic flotation agent and sent to a coarse flotation tank to produce a concentrate, which is operated at least once in a cleaning flotation tank to form a concentrate. However, most of the phosphate impurities have been removed from this concentrate. After drying, the concentrate is sent for calcination in a rotary kiln at a maximum temperature of 900°C. The calcined concentrate is subjected to reduction with a reducing gaseous mixture at a temperature of 400 to 600°C and, while still hot, subjected to low-intensity magnetic separation. The hot non-magnetic fraction is then sent to an electrostatic separation system consisting of at least two stages. The first system produces tailings from which silica and pre-concentrate are removed as major impurities. In the second stage, a final concentrate and an intermediate concentrate are obtained, the latter being recycled. Example 1000 kg of ore with a TiO ₂ content of 20.66% was sent to a washer and then to a classifier, in which approximately
Parts with particle sizes above 0.105 mm were screened out.
This division represents 56.9% of the supply,
This material was subjected to magnetic selection in a 900 Gauss magnetic field. A non-magnetic fraction representing 28.6% of the feed was fed into a closed grinding circuit to reduce its particle size to 0.841 mm. At this stage, the division is already
It showed a _TiO2 content of 41.09%. The pulp thus obtained was aged and flotated for phosphate removal. After drying and calcination at 700°C, the flotated concentrate was cooled to 500°C and reduced in a reducing atmosphere containing 4% CO2. The reduced material, still hot, is brought to magnetic separation in a 900 Gauss magnetic field, thus TiO ₂ 55.25
% non-magnetic concentrate was obtained. While still hot, the section was sent to a first electrostatic separation in a 15 kV electric field, thus separating the siliceous tailings. In a second electrostatic sorting in a 25kv electric field, _TiO2
84.70% of the final product and tailings were obtained, the latter being recycled to the first stage of electrostatic separation. The results obtained are shown in the table below.

【table】

【table】

The above examples are provided to make the invention more clear to those skilled in the art, but are not intended to limit the invention in any way.

Claims (1)

[Claims] 1. In a beneficiation method for titanium ore in which anatase appears as an oxide, the ore is scrubbed.
and slime removal followed by magnetic separation;
crushing the non-magnetic part and separating the fines, followed by flotation, calcination and reduction of the concentrate and then subjecting it to low intensity magnetic separation; A method for beneficiation of titanium ore, characterized by including a step of screening. 2 In the mineral beneficiation method described in claim 1,
Disintegration and slime removal from 18
A titanium ore beneficiation method that is carried out until a 0.105 mm split is obtained. 3 In the mineral beneficiation method described in claim 1,
A titanium ore beneficiation method characterized in that the magnetic separation is performed in a magnetic field of 300 to 3000 Gauss. 4 In the mineral beneficiation method described in claim 1,
A process for beneficiation of titanium ore, characterized in that the crushing of the non-magnetic split portions is carried out in a closed circuit to a size of 0.841 mm, and the sizing is carried out on a flat, inclined and fixed screen. . 5 In the mineral beneficiation method described in claim 1,
A process for beneficiation of titanium ores, characterized in that the anionic flotation is carried out under conditions making it possible to obtain a concentrate with less than 3% P ₂ O ₅ . 6 In the mineral beneficiation method described in claim 1,
A titanium ore beneficiation method characterized in that the calcination is performed at a temperature lower than 900℃. 7 In the mineral beneficiation method described in claim 1,
A process for beneficiation of titanium ores, characterized in that the reduction is carried out at temperatures of 400°C and 600°C in a reducing atmosphere in which the gas for reduction contains at least 10% reducing gas. 8 In the mineral beneficiation method described in claim 1,
The electrostatic selection of the reduced non-magnetic part
A titanium ore beneficiation method characterized by being carried out in an electric field of 5KV to 50KV.