CN102357420A - Decarburizing method for high-carbon stone coal navajoite - Google Patents

Abstract

The invention relates to a decarburizing method for high-carbon stone coal navajoite. The method comprises the following steps of: (1) crushing raw stone coal navajoite, performing wet grinding to obtain ore powder-containing pulp; (2) flooding the ore powder-containing pulp to a stirring tank through a grader, feeding the uniformly mixed pulp into a dosing stirring barrel, simultaneously adding a flotation agent into the dosing stirring barrel, and fully mixing the pulp and the flotation agent to obtain mixed pulp; (3) performing flotation roughing operation on the mixed pulp, and performing air flotation to obtain a foam product A and an ore concentrate of a bottom flow product A; and (4) performing primary scavenging operation on the foam product A to obtain a foam product B and a bottom flow product B, and returning the bottom flow product B to the flotation roughing operation; performing secondary scavenging operation on the foam product B to obtain a foam product C and a bottom flow product C, and returning the bottom flow product C to the primary scavenging operation; and performing tertiary scavenging on the foam product C to obtain tailings and a bottom flow product D, and returning the bottom flow product D to the secondary scavenging operation. The method is simple and stable in operation.

Description

A kind of decarbonization method of high-carbon bone coal navajoite

Technical field

The present invention relates to the ore beneficiation field, relate in particular to a kind of decarbonization method of high-carbon bone coal navajoite.

Background technology

Vanadium is a kind of important strategic goods and materials, is mainly used in fields such as steel and iron industry, national defence sophisticated technology, chemical industry and light and textile industries.Vanadium does not become mineral separately, does not have the rich ore that can supply exploit, and always with low-grade and other mineral intergrowth, at present, the primary raw material of vanadium extraction is vanadium titano-magnetite and bone coal.Because the bone coal resource of China is very abundant, particularly the reserves of vanadium surpass the summation of countries in the world vanadic anhydride reserves in the bone coal, thereby vanadium extraction is a very important developing direction from bone coal.

Bone coal is a kind of shale of carbonaceous, and key property is that ash is high, density is big, caloric value is low, compact structure, ignition point is high, nonflammable and be difficult to completing combustion.The bone coal ore deposit belongs to the low-grade vanadium resource that contains, and except that China, other country exploits utilize still rare in industry in the world.In the bone coal differ greatly in the grade various places of vanadium, is generally 0.13%～1.2%, accounts for 60% less than cutoff grade 0.5%.Under present condition of technology and economy, the commercial mining that just has that grade reaches more than 0.8% is worth.

Comprise an important procedure in the bone coal in the technology of vanadium extraction---roasting (being divided into oxidizing roasting, sodium roasting and calcification baking etc.); Its objective is the high price vanadium (pentavalent vanadium) that the v element that exists with insoluble low price vanadium (trivalent vanadium and tetravalence vanadium) in the bone coal is converted into solubility, be convenient to reclaim through leaching.This operation is the crucial and basic of process for extracting vanadium, and the quality of roasting quality is directly determining the height of leaching rate, affects production cost, and the carbon content in the high-carbon navajoite is the key factor that influences roasting quality.

Sintering temperature is the key factor of decision roasting quality, and the roasting of bone coal navajoite is to accomplish according to the characteristic spontaneous combustion of self carbon containing, so sintering temperature just depends on the height of phosphorus content to a great extent; Phosphorus content is too high; Then sintering temperature is high, is prone to refining piece and peroxidating take place, and pentavalent vanadium conversion ratio is low; Leaching rate is low, and phosphorus content is crossed to hang down and then can't be accomplished spontaneous combustion process.The phosphorus content that this technology is suitable is about 5%.

And in fact, the phosphorus content of many bone coal navajoites is all higher, and what have reaches more than 15%, can't make full use of, and has seriously limited the development and use of this resource.The general carbon rejection processes that adopts is burning in existing the production; Reduce phosphorus content through spontaneous combustion; The shortcoming of this method is that burning back carbon content generally is low to moderate about 2%; In calcining process, also need again with addition of about the carbon to 5%, and technology is complicated, needs to build new combustion furnace, hammer is broken and the operation of system ball.

Summary of the invention

Technical problem to be solved by this invention provides a kind of decarbonization method of stable high-carbon bone coal navajoite simple to operate.

For addressing the above problem, the decarbonization method of a kind of high-carbon bone coal navajoite of the present invention may further comprise the steps:

(1) with the bone coal navajoite crushing raw ore to particle diameter≤20mm, carry out wet grinding, what obtain fineness≤200 orders, mass content 50～98% contains the breeze ore pulp;

(2) the said classified machine overflow entering of the breeze ore pulp tank diameter that contains; Ore pulp behind the mixing gets into the dosing agitator; In said dosing agitator, add 1200～2500g floating agent simultaneously, ore pulp is fully mixed with floating agent, obtain mixed ore pulp by raw ore per ton;

(3) said mixed ore pulp is fed the roughing flotation operation, behind the air flotation, obtain froth pulp A and underflow product A concentrate, the carbonaceous amount content of this concentrate is 5～6%;

(4) after said froth pulp A scans operation through one section, obtain froth pulp B and underflow product B, said underflow product B is returned said roughing flotation operation; Said froth pulp B get into two sections scan operation after, obtain froth pulp C and underflow products C, said underflow products C is returned said one section and is scanned operation; Said froth pulp C get into three sections scan after, obtain mine tailing and underflow product D, said underflow product D returns said two sections and scans operation.

The phosphorus content of bone coal navajoite raw ore is more than 12% in the said step (1).

Floating agent in the said step (2) is to be stirred at normal temperatures by 0.05～0.15 mass ratio and got by common kerosene and foaming characteristic oil.

The present invention compared with prior art has the following advantages:

1, the present invention has simplified production process through the decarbonizing process of physical method completion high-carbon bone coal navajoite, has reduced input, and has reduced production cost.

2, floatation process of the present invention is easy to control, can control the phosphorus content of product through adding dose and operating parameter (flotation air inflation amount, mineral pulp level etc.) adjustment, makes it reach best requirement.

3, floating agent kind of the present invention is single, and consumption is few, only needs a dosing can satisfy the flotation requirement, and not only collecting is effective, and reagent cost is low, and medicament is nontoxic, pollution-free simultaneously.

4, behind employing the present invention; Make phosphorus content after the decarburization of the process of the bone coal navajoite more than 8%; Phosphorus content is reduced in the optimum range about 5%, thereby makes the high-carbon navajoite can adopt also that roasting---extract technology extracts vanadic anhydride, effectively utilize the navajoite resource.

5, the present invention adopts the floatation process technology advanced, domestic no production application, and this Technological adaptability is good, can reach the suitable phosphorus content requirement about 5% after the decarburization, and vanadium grade increase rate is big, and is simple to operate stable, good in economic efficiency.

6, the present invention is through to the test of certain high-carbon bone coal navajoite, and the phosphorus content that can make navajoite is reduced to about 5.7% from about 15%, has reached the phosphorus content requirement of roasting technique.

7, the present invention not only can be applicable to the ore dressing of bone coal navajoite, and can be applicable to the ore dressing of other carbon containing mineral.

The specific embodiment

A kind of decarbonization method of high-carbon bone coal navajoite may further comprise the steps:

(1) with phosphorus content be bone coal navajoite crushing raw ore more than 12% to particle diameter≤20mm, get into ball mill and carry out wet grinding, what obtain fineness≤200 orders, mass content 50～98% contains the breeze ore pulp.

(2) contain the classified machine overflow of breeze ore pulp and get into tank diameter stablize head grade and concentration, the ore pulp behind the mixing gets into the dosing agitator, and keeps fixedly that liquid level fluctuates with the minimizing mine-supplying quantity; In the dosing agitator, add 1200～2500g floating agent simultaneously, ore pulp is fully mixed with floating agent, obtain mixed ore pulp by raw ore per ton.

Floating agent is to be stirred at normal temperatures by 1: 0.05～0.15 mass ratio (kg/kg) and got by common kerosene and foaming characteristic oil.

(3) mixed ore pulp is fed the roughing flotation operation, after the employing pneumatic flotation cell carries out air flotation, obtain froth pulp A and underflow product A concentrate, the carbonaceous amount content of this concentrate is 5～6%.

(4) after froth pulp A scans operation through one section, obtain froth pulp B and underflow product B, the underflow product B is returned the roughing flotation operation; Froth pulp B get into two sections scan operation after, obtain froth pulp C and underflow products C, the underflow products C is returned one section and is scanned operation; Froth pulp C get into three sections scan after, obtain mine tailing and underflow product D, underflow product D returns two sections and scans operation.

Claims (3)

1. the decarbonization method of a high-carbon bone coal navajoite may further comprise the steps:

(1) with the bone coal navajoite crushing raw ore to particle diameter≤20mm, carry out wet grinding, what obtain fineness≤200 orders, mass content 50～98% contains the breeze ore pulp;

(2) the said classified machine overflow entering of the breeze ore pulp tank diameter that contains; Ore pulp behind the mixing gets into the dosing agitator; In said dosing agitator, add 1200～2500g floating agent simultaneously, ore pulp is fully mixed with floating agent, obtain mixed ore pulp by raw ore per ton;

(3) said mixed ore pulp is fed the roughing flotation operation, behind the air flotation, obtain froth pulp A and underflow product A concentrate, the carbonaceous amount content of this concentrate is 5～6%;

(4) after said froth pulp A scans operation through one section, obtain froth pulp B and underflow product B, said underflow product B is returned said roughing flotation operation; Said froth pulp B get into two sections scan operation after, obtain froth pulp C and underflow products C, said underflow products C is returned said one section and is scanned operation; Said froth pulp C get into three sections scan after, obtain mine tailing and underflow product D, said underflow product D returns said two sections and scans operation.

2. the decarbonization method of a kind of high-carbon bone coal navajoite as claimed in claim 1 is characterized in that: the phosphorus content of bone coal navajoite raw ore is more than 12% in the said step (1).

3. the decarbonization method of a kind of high-carbon bone coal navajoite as claimed in claim 1 is characterized in that: the floating agent in the said step (2) is to be stirred at normal temperatures by 1: 0.05～0.15 mass ratio and got by common kerosene and foaming characteristic oil.