Device and method for high-sulfur bauxite suspension roasting oxidative desulfurization

A high-sulfur bauxite and suspension roasting technology, applied in the fields of metallurgy and mineral processing, can solve the problems of complex process, under-fired, long reaction time, etc., and achieve the effects of simple process flow, uniform temperature in the furnace, and stable product properties.

Active Publication Date: 2019-10-08
NORTHEASTERN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Reverse flotation desulfurization uses xanthate collectors to collect sulfides, which can achieve a better separation effect; however, the treatment capacity of flotation desulfurization is low, the process is complicated, and the water consumption is large, and the residual flotation agents will affect the alumina. production; roasting desulfurization refers to roasting bauxite at a certain temperature and an oxidizing atmosphere to oxidize pyrite into iron oxide (Fe 2 o 3 ) and SO 2 At present, the main equipment for roasting and desulfurization is the rotary kiln, but due to the static roasting state, the reaction time is long, the gas-solid contact is not sufficient, and the ore is heated unevenly, which is easy to cause "over-burning" or "under-burning" phenomenon ; Therefore, the new high-sulfur bauxite oxidation roasting technology and equipment have yet to be developed

Method used

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  • Device and method for high-sulfur bauxite suspension roasting oxidative desulfurization

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Suspension roasting oxidative desulfurization device for high-sulfur bauxite such as figure 1 As shown, it includes silo 1, screw feeder 2, primary cyclone separator 3, suspension roaster 7, secondary cyclone separator 9 and dust removal and desulfurization equipment 4; the outlet of silo 1 and the inlet of screw feeder 2 Connected, the outlet of the screw feeder 2 communicates with the feed port of the primary cyclone separator 3 through the feed port pipeline, and the discharge port of the primary cyclone separator 3 communicates with the feed port of the lower part of the suspension roaster 7, and the suspension The top of the roasting furnace 7 communicates with the feed port of the secondary cyclone separator 9 through the upper channel 8; wherein, the bottom of the suspension roasting furnace 7 is provided with a burner 6, and the gas outlet of the secondary cyclone separator 9 passes through the feed port pipeline It is connected with the feed port of the primary...

Embodiment 2

[0047] Device structure is the same as embodiment 1;

[0048] The high-sulfur bauxite used contains Al by mass percentage 2 o 3 64.61%, SiO 2 8.97%, S 4.77%, TFe9.46%, CaO 0.35%, MgO 0.41%, TiO 2 2.65%.

[0049] Method is with embodiment 1, and difference is:

[0050] (1) Particle size ≤ 0.074mm in the high-sulfur bauxite powder accounts for 90% of the total mass;

[0051] (2) The volume flow ratio of natural gas and air passed into the burner is 1:15, and O in the high-temperature oxidizing gas produced by combustion 2 The volume concentration of 20%;

[0052] (3) The ratio of the volume flow rate of the high temperature oxidizing gas in the suspension heating furnace to the mass flow rate of the primary solid material is 4.2m 3 / kg;

[0053] (4) The temperature of the oxidation roasting reaction in the suspension roaster is 900°C, and the residence time of the primary solid material in the suspension roaster is 40s;

[0054] (5) The mass percentage of S in the ba...

Embodiment 3

[0056] Device structure is the same as embodiment 1;

[0057] The high-sulfur bauxite used contains Al by mass percentage 2 o 3 59.77%, SiO 2 11.65%, S 2.97%, TFe7.33%, CaO 0.41%, MgO 0.88%, TiO 2 2.70%.

[0058] Method is with embodiment 1, and difference is:

[0059] (1) Particle size ≤ 0.074mm in the high-sulfur bauxite powder accounts for 75% of the total mass;

[0060] (2) The volume flow ratio of natural gas and air passed into the burner is 1:13, and O in the high-temperature oxidizing gas produced by combustion 2 The volume concentration of 19%;

[0061] (3) The ratio of the volume flow rate of the high temperature oxidizing gas in the suspension heating furnace to the mass flow rate of the primary solid material is 5.1m 3 / kg;

[0062] (4) The temperature of the oxidation roasting reaction in the suspension roaster is 1050°C, and the residence time of the primary solid material in the suspension roaster is 45s;

[0063] (5) The mass percentage of S in the ...

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Abstract

The invention provides a device and a method for high-sulfur bauxite suspension roasting oxidative desulfurization. The device comprises a stock bin, a spiral feeder, a primary cyclone separator, a suspension roasting furnace, a secondary cyclone separator and dust removal and desulfurization equipment. The method comprises the following steps that (1) high-sulfur bauxite is crushed and dried in the stock bin; (2) an induced draft fan is started to form negative pressure in a system; (3) natural gas and air is introduced into a burner, and ignited to form high-temperature oxidizing gas; (4) high-sulfur bauxite powder is fed into the primary cyclone separator, and generated primary solid materials are enabled to enter a suspension roasting furnace; (5) the primary solid materials are oxidized and roasted, and the reacted materials are fed into the secondary cyclone separator; and (6) second-stage solid materials are discharged through a discharging pipe. The method is simple in processflow, low in comprehensive energy consumption, high in gas-solid mass transfer and heat transfer efficiency, stable in product property, and high in production efficiency.

Description

technical field [0001] The invention belongs to the technical fields of mineral processing and metallurgy, and in particular relates to a device and method for suspension roasting oxidation desulfurization of high-sulfur bauxite. Background technique [0002] High-sulfur bauxite refers to bauxite with a sulfur content greater than 0.7%. The sulfur in high-sulfur bauxite is mainly pyrite (FeS 2 ) and its isomer marcasite, and a small amount in the form of sulfate; when high-sulfur bauxite is leached out by the Bayer process, sulfur will be in the form of SO 3 2- , SO 4 2- , S 2- , S 2 o 3 2- form into the sodium aluminate solution, resulting in equipment corrosion, a decrease in the dissolution rate of alumina and an increase in the iron content in the solution; in addition, SO 4 2- , S 2- The accumulation in the mother liquor will affect the cycle of the Bayer production process; these reasons lead to the fact that high-sulfur bauxite is not used in the alumina pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/10
CPCC22B1/10
Inventor 余建文韩跃新李艳军李佩昱
Owner NORTHEASTERN UNIV
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