Design of primary ore selection plant for strontium ore and strontium iron ore

I. Tantalite-tantalum ore dressing

(A) tantalite ore - columbite methods and processes selected from

Tantalite - columbite ore mostly tantalum, niobium, tin, tungsten, lithium, beryllium and other metal. It has the characteristics of low ore grade, complex mineral composition, large mineral density, brittleness and brittleness. The ore dressing method mainly adopts methods such as re-election, magnetic separation, electric selection, floating re-election, flotation and chemical treatment. The beneficiation process is generally divided into two parts: rough selection and selection.

1, é’½ iron ore - strontium iron ore rough selection

The rough selection of coltan-niobite is mainly carried out by re-election process, but also by re-election-flotation-re-election; re-election-flotation or re-election-magnetic separation-re-election.

Re-election process

Tantalum and niobium primary ore grinding stage multi-use, multi-stage re-election. Separation equipment is usually added to the grinding circuit to recover monomer minerals early. Due to the better dissociation of mineral monomers, the bismuth ore is generally not required to be crushed and ground. Before screening, the stones and pebbles are removed and coarsely selected. The coarse-grained coltan-antimonite ore is coarsely selected by a jig or a spiral concentrator (including a rotating spiral chute), and the coarsely selected concentrate is selected by a shaker; the fine-grained coltan-column is a spiral chute or shake The bed is coarsely selected, and the coarsely selected concentrate is selected by a shaker; the strontium ore is coarsely selected by a centrifugal concentrator or a multi-layer turning bed, and the rough-selected concentrate is selected by a belt chute or a trough belt chute combined with a mud shaker. This process is characterized by low investment, fast launch, low cost, and less environmental pollution. However, the efficiency of the slime selection is low.

Re-election-flotation-re-election or re-election-flotation process The coarse and fine-grained materials are re-elected and the slime is floated. Before flotation, generally use a small diameter cyclone or centrifugal concentrator to remove mud, then use alkyl sulfonated succinate as a collector , sodium silicate and acid as a regulator, float at pH 2 ~ 3 Selection, flotation concentrate with Hallmann slime shaker - cross-flow belt chute selection; or use styrene phosphonic acid as collector, sodium fluorosilicate, lead nitrate as a regulator, float at pH 6 Selection, flotation concentrate is selected by vibrating belt chute or cross-flow belt chute. It can also use hydroxamic acid and transformer oil (2:1) as collector, sodium hydroxide and sodium silicate as regulator, at pH8. The conditions of ~8.5 were carried out for flotation, flotation of concentrate and hydroxamic acid and transformer oil, and oxalic acid as an inhibitor, and the selection was carried out under the conditions of pH 2.5 to 3. According to the above method, the coltan or coltan concentrate can be obtained. The characteristics of this process are high, but the content of strontium in the removed fine mud is close to the original ore grade, the consumption of the pharmacy is large, and the production cost is high.

Reselection - magnetic separation - reselection process

The coarse-grained material is re-selected. Fine-grain grade and slime are combined by magnetic separation-re-election. The process is characterized by high efficiency in the selection of fine-grained coltan and coltan, but the strontium minerals in the ore must have weak magnetic properties.

2, strontium iron ore - coltan fine concentrate selection

The strontium-iron-iron ore fine concentrate has a complex composition and is difficult to sort. It often requires one or two or more combinations of methods such as magnetic separation, re-election, floating re-election, flotation, electro-election, and chemical treatment. . In particular, the separation of coltan, coltan and certain refractory minerals requires a combination of various methods. For example, coltan-niobite is separated from garnet and tourmaline , and magnetic separation, electric selection or flotation is usually used.

Magnetic separation

Their specific susceptibility: tantalite is 2.4 × 10 ^-5 cm ³ / g, columbite of 2.5 × 10 ^-5 cm ³ / g, columbite of 2.5 × 10 ^-5 cm ³ / g, yttrium brown The antimony ore is 5.8××10 ^-5 cm ³ /g, and the garnet and tourmaline are changed with the iron content. When the content of Fe ₂ O ₃ is increased from 7% to 25%, the specific magnetic susceptibility is determined by 11×10 ^-6 cm/g increased to 124×10 ^-6 cm/g (11 times increase), when the content of Fe ₂ O ₃ increased from 0.3% to 13.8%, the specific magnetic susceptibility of the tourmaline was 11× 10 ^-6 cm ³ /g increased to 124 × 10 ^-6 cm ³ / gram (11 times increase). In order to improve the selectivity of mineral separation in a magnetic field, it is generally treated with acid (solid: liquid = 1:5) for a short time (5 to 15 minutes) to remove iron from the mineral surface and then separated in a magnetic field of different strength. From garnet and tourmaline, bismuth concentrate can be obtained.

Electrical separation

The material is first subjected to narrow-level screening and classification, and then separately heated to perform electric selection in the composite electric field: greater than 0.2 mm, the granularity is generally low voltage (20 to 35 kV), large pole pitch (80 to 100 mm), Slow speed (low centrifugal force) (roller or drum rotation is 33 to 38 rpm). -0.2～+0.08mm grain size generally uses high voltage (35～45 kV), small pole pitch (50～80mm), fast rotation speed (high centrifugal force) (roller rotation number is 70～118 rpm) . The coltan-niobite can be separated from the garnet.

Flotation separation

Sodium hexadecyl sulfonate is used as a collector, and a fluorine compound is used as a regulator to separate the coltan from the garnet.

Separation of coltan from monazite

The coarse fraction is usually selected by electro-election: fine-grain grade (-0.075 mm) using oleic acid or rice sugar oil as a collector, sodium carbonate (Na ₂ CO ₃ ) as a regulator, sodium silicate (Na ₂ SiO ₃ ), sodium sulfide (Na ₂ S) as inhibitors of _{(Na 2 SiO 3 :Na 2 S} = 3:1), monazite floating at pH9, and make the iron tantalum (niobium iron ore) is separated from the monazite.

Separation of fine spar and cassiterite

The coarse fraction is usually electrostatically selected (voltage 16 kV); the fine fraction is first treated with 2% hydrochloric acid for 15 minutes, then sodium alkyl sulfate (600 g/ton) is used as a collector, and sodium fluorosilicate (with sodium fluorosilicate) Na ₂ SiF ₆ ) acts as an inhibitor, and the cassiterite floats under the condition of pH 2 to 2.3, and the fine spar can be separated from the cassiterite.

Separation of coltan and magnetic cassiterite

The coarse-grain grade is generally sorted by a wind shaker; the fine-grain grade, Guangzhou Institute of Nonferrous Metals Research, China, develops a new magnetic separation process for oxidizing roasting (800-900 °C), which can separate the coltan and ruthenium red. Stone and cassiterite.

Separation of coltan and black tungsten ore

Water smelting is usually used. First, the material is ground to -0.04 mm, calcined with sodium carbonate (Na ₂ CO ₃ ) (800 ° C), or boiled with concentrated alkali at normal pressure. After filtration, the residue is decomposed with HCl (5%) to obtain artificial mash. Concentrate. The filtrate is a sodium tungstate solution, and after oxidation (pH 2 to 2.5), extraction, neutralization, crystallization, and the like, a tungsten oxide (WO ₃ ) product can be obtained.

Separation of coltan and zircon

Magnetic separation or flotation can be used. Flotation can use sodium oleate as a collector, lead chloride, water glass and lead chloride, and oxalic acid as a regulator to separate the coltan from zircon.

Second, the example of the strontium iron ore-tantalum ore dressing plant

(1) Separation of primary ore of pegmatite from strontium iron ore-iron ore

Xinjiang Coco Tokai Lithium, Antimony and Antimony Ore Dressing Plant

The Cocoto Sea Mine is located in the Xinjiang Uygur Autonomous Region. A pegmatite-based lithium, beryllium, tantalum and niobium, rubidium, cesium polymetallic deposit. There are four veins, of which the No. 3 vein (currently the mining vein) is the largest. The ore contains (TaNb) ₂ O ₅ 0.015% (Ta: Nb = 1:1), BeO 0.093%, and Li ₂ O 1.29%. The strontium minerals are mainly manganese strontium ore, strontium manganese ore and fine spar. The strontium mineral is mainly beryl. Lithium minerals are mainly spodumene. The gangue is mainly quartz and feldspar . Mineral granules: strontium minerals are up to 1 to 2 mm, typically 0.3 to 0.08 mm. The beryl is generally above 0.2 mm. Spodumene is generally 0.2 mm.

The design scale of the concentrator is 750 tons/day. It is divided into three systems: No. 1 system treats strontium ore and treats 400 tons of ore daily. The 2 ton system processes lithium ore and processes 250 tons of ore per day. The No. 3 system processes helium ore and processes 100 tons of ore per day. The No. 3 system beneficiation process is shown in Figure 1, using a two-stage grinding heavy-magnetic-floating process. The first section of the rod mill, grinding particle size -1 mm. The second stage of ball milling, grinding particle size -0.2 mm. Grinding products are coarsely selected with a φ940 mm rotating spiral chute (pitch 500 mm, speed 12-16 rpm); the rotating spiral chute tailings are graded by a φ250 mm cyclone, and the cyclone overflows to send the No. 2 system to float lithium. The rotating spiral chute concentrate is first removed by a weak magnetic field magnetic separator, then the shaker is graded, and the shaker tailings are returned to the ball mill . The shaker concentrate is fed into a double-disc magnetic separator to select four kinds of products: iron filings, antimony concentrate, antimony ore and non-magnetic materials (tailing). The magnetic separation of the medium ore (钽铌-garnet) is carried out by flotation re-election, and the sputum and garnet are sorted. The iron filings are subjected to acid leaching and filtration, and the slag is the strontium concentrate. General mineral processing index: Tannin concentrate grade (TaNb) ₂ O ₅ 50% ~ 60%, recovery rate of 62%.

Bernick Lake Antimony Concentrator

The Bernic Lake Mine is located in Lake Bernic, Manitoba, Canada. It is a large-scale lithium, strontium, strontium, strontium, and strontium pegmatite deposit. There are nine ore belts, including two antimony belts and one lithium belt. Currently, the antimony belt is mined. The grade of ore contains Ta ₂ O ₅ 0.13%. The ore minerals in the ore mainly include tin manganese ore, heavy bismuth iron ore, strontium zirconium ore, antimony ore, antimony ore and fine spar. It is currently the main production base of the world's raw materials.

The concentrating plant has a scale of 830 tons/day, using a three-stage closed-circuit crushing process and a re-election-flotation process for closed-circuit grinding. The ore (330 mm) is crushed to -9.5 mm by a jaw crusher , a standard cone crusher , a short-head cone crusher, and is fed into a 2.5 mm Taylor sieve. The material on the sieve is sent to a ball mill. The ball mill discharge and the AC sieve constitute a closed circuit. . Less than 2.5 mm material passes through a 210 micron Derrick three-way feed screen. More than 210 micro-materials are selected by 7 φ600 mm double-headed spiral concentrators, and one spiral concentrator is selected. The spiral concentrate is selected by a shaker, the spiral tailings are passed through a 300 micron DSM sieve, and the material larger than 300 microns is returned to the ball mill. The less than 300 micron material is fed into a φ150 mm secondary desilting cyclone.

The less than 210 micron material is fed into the φ150 micron primary de-slect cyclone to remove the fine mud below 20 microns, and the bottom stream of the cyclone is roughly selected by the Dest three-layer hanging ore shaker, selected by the selected shaker, shaken The bed mine is fed into the φ150 mm secondary dehumidification cyclone, the cyclone overflows into the φ50 mm cyclone to remove mud (-7 microns), and the cyclone bottom flow is fed to the second Derrick screen and the sieve material. (+40 micron) is sent to the sweeping spiral circuit, the sieved material (-40 micron) is fed to the thickener, the thickener is used for the sedimentation of the alkylsulfonated succinate, and the sodium silicate and oxalic acid are used as the adjusting agent. The flocide minerals are floated under the conditions of pH 2~3, the flotation concentrate is selected by the Holman shaker-cross-flow belt chute, the shaker tailings is subjected to secondary flotation, and the flotation concentrate is used with the second cross-flow belt chute. Select the antimony concentrate. Production index, tantalum concentrate grade (Ta ₂ O ₅ ) 38.55%, recovery rate of 73%. The flow is shown in Figure 1.

Figure 1 Process of the Berner Lake antimony ore dressing plant

The tailings are treated with lime and a starter and then sent to the tailings for storage. The plant has a Mintek slurry current-carrying analyzer and an electronic computer. The Ta ₂ O ₅ content is measured simultaneously every five minutes for the tailings of the seven operations. The analysis results are reported by the computer to notify the operator to adjust the process parameters in time. Thereby ensuring the best production conditions.