CN1718750A

CN1718750A - Comprehensive recovery method of pyrite slag

Info

Publication number: CN1718750A
Application number: CNA2005100210053A
Authority: CN
Inventors: 池煊庆
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-05-31
Filing date: 2005-05-31
Publication date: 2006-01-11
Anticipated expiration: 2025-05-31
Also published as: CN100365134C

Abstract

A comprehensive recovery method for the slag of troilite includes such steps as three-stage wet-type magnetic dressing to obtain the concentrate with 10-15% of iron content, filter, mixing with coke powder, iron chloride, magnesium chloride and urea-aldehyde resin, granulating, drying to obtain palletized ore and dust, reducing and chlorinating to obtain qualified palletized ore with iron content more than 60%, collecting dust and fume ash, water cooling and extracting Pb, Cu and Zn.

Description

The comprehensive recovering process of pyrite cinder

Technical field

The present invention relates to a kind of recovery method of waste residue, particularly relate to a kind of comprehensive recovering process of pyrite cinder.

Background technology

Sulfurous iron ore is to produce one of vitriolic raw material, must burn slag after the desulfurization relieving haperacidity, and generally between 34%～55%, impurity is generally sulphur, phosphorus, arsenic, copper, lead, zinc, gold, reaches silver iron content.Wherein, small part can be arranged in pairs or groups in iron-smelting raw material, mainly uses at a low price as the raw material of cement baking.Simultaneously, burning slag also can pollute environment.At present, the recovery method of pyrite cinder mainly contains " photosynthetic " method of Japan, and this method requires to burn the slag iron-holder and is higher than 55%, and sulphur content is lower than 1%.And the flow process complexity, the equipment complexity, chlorizating agent is more expensive, and investment is big.And China has the slag roasting iron-holder in half left and right sides all to be lower than 50%, can't utilize " photosynthetic " method.Chinese patent 87108148 discloses the pretreatment process that a kind of pyrite burns (before the ironmaking), and the concentrate after the magnetic separation of employing two-stage hygrometric state mixes with other ferrous material, flux etc., and roasting becomes to be fit to the self-fluxed sinter or the acid pellet ore of blast furnace ironmaking.The subject matter that this method exists is, the magneticstrength of strong magnetic flux journey reaches 12000～20000 Gausses in the magnetic separation, and investment is big, and the energy consumption height does not reclaim valuable metal, and non-ferrous metal impurity can't remove.

Summary of the invention

The objective of the invention is to overcome above-mentioned shortcoming, provide a kind of investment less, it is low to consume energy, and can not only obtain qualified iron ball nodulizing, can reclaim the comprehensive recovering process of the pyrite cinder of valuable metal simultaneously again.

The comprehensive recovering process of pyrite cinder of the present invention comprises that the preparation of three sections wet type ore dressings, qualified iron ball nodulizing and valuable metal reclaim, and its operation steps is as follows:

1) at first pyrite cinder is carried out three sections wet magnetic separations.Its process is, pyrite cinder is carried out in the wet type magnetic earlier throws the tail ore dressing, magnetic field boundary intensity 2400～2800 Gausses, concentrate A and coarse grain mine tailing; Utilize hydrocyclone that concentrate A is carried out the overflow ball milling, make concentrate A granularity reach 200～325 orders, wherein, 50% concentrate A granularity reaches about 325 orders; Again concentrate A is carried out the wet type weak magnetic beneficiation, magnetic field boundary intensity 1200～1600 Gausses get chats 1 and concentrate B; Again clear ore deposit B is carried out magnetic concentration in the wet type, magnetic field boundary intensity 3600～4000 Gausses get concentrate C and chats 2; Concentrate C is filtered, get concentrate and filtrate A, generally adopt the vacuum filtration of inward flow filtration-type disk.The same prior art of the technological operation of this wet magnetic separation.When the iron level in three sections wet magnetic separation gained chats 1 and the chats 2 is higher than 15%, merge with concentrate, it is standby with the merging of coarse grain mine tailing to be lower than at 15% o'clock.

2) with step 1) gained concentrate and iron(ic) chloride, magnesium chloride, coke powder and urea-formaldehyde resin adhesive batching, it is dry to granulate, get dry bulb nodulizing and ash content, then the dry bulb nodulizing is reduced chloridizing volatilization in rotary kiln, 900～1050 ℃ of maturing temperatures, roasting time was generally 30 minutes, got qualified iron ball nodulizing, and its iron-holder is 60～64%.Other impurity is as, phosphorus, sulphur and the oxidized volatilization of arsenic, and copper, lead and zinc all reduce chloridizing volatilization and deviates from.Wherein, the proportioning of component is concentrate by weight in the reduction chloridizing volatilization: iron(ic) chloride: magnesium chloride: coke powder: urea aldehyde village fat glue=100: 4～6: 0～2: 7: 1.

3) with step 2) ash content of granulating when dry carries out three grades of wet dust collections, filter, liquor B and filter residue, filter residue returns step 2) in cylinder batching, simultaneously, to step 2) in the mixing flue dust that produces during reduction chloridizing volatilization gather dust, get volatile matter and flue dust, flue dust returns the cylinder batching, and volatile matter carries out three sections water-cooleds and absorbs, and absorption liquid is filtrate A and liquor B, get absorption liquid and precipitation, in precipitation, add sulfuric acid, filter, get the lead sulfate precipitation; Absorption liquid is carried out conventional iron replacement, filters, get copper precipitation and liquor C,, in liquor C, add calcium hydroxide and carry out the lime neutralization, filter, get zinc hydroxide precipitation and filtrate D; In filtrate D, add ammoniacal liquor and reduce, get reduced liquid,, behind the adding hydrochloric acid, return the cylinder batching with coarse grain mine tailing, part chats 1 and 2 merging of part chats of step 1) gained.Wherein, the weight percent branch concentration of hydrochloric acid is 31%～38%, and add-on is 1% of a concentrate total amount.

The advantage of pyrite cinder comprehensive recovering process of the present invention is, the ore dressing in this method can make iron-holder improve 10～15%, obtains iron-holder greater than 60% concentrate, iron recovery is greater than 90%, coarse grain mine tailing iron-holder is lower than 15%, simultaneously, recovery rate of valuable metals is reached more than 90%.Adopt the calcium chloride in the iron(ic) chloride replacement neutralisation in reduction chloridizing volatilization, make the iron-holder of iron ball nodulizing increase by 2%～4% on the one hand, the aspect makes the material softening temperature improve 20 ℃ in addition, thereby prevents to tie kiln.In whole processing step, water and slag obtain recycle, economize on resources, and administer effectively and pollute, and turn waste into wealth, and help resource recovery.Lack alleviating domestic iron resources, it is all significant to handle low-grade iron ore.The pyrite slag for comprehensive that is suitable for various grades reclaims.

Description of drawings

Fig. 1: the process flow sheet of pyrite cinder comprehensive recovering process of the present invention

Embodiment

The raw material of embodiment 1～3 is a pyrite cinder in the money of Sichuan, and its chemical ingredients is as shown in table 1.Result behind overflow ball milling and wet magnetic separation is as shown in table 2.Reduction chloridizing volatilization and comprehensive recovery result are as shown in table 3.

Table 1: pyrite cinder main chemical compositions (%)

Fe	S	P	As	Cu	Pb	Zn	Au g/t	Ag g/t	SiO ₂	CaO	Al ₂O ₃
Fe	S	P	As	Cu	Pb	Zn	Au g/t	Ag g/t	SiO ₂	CaO	Al ₂O ₃	34-55	1-3	0.05	0.1-0.2	0.2	1-2	0.5-2	0.5-1	20-50	2-8	2-5	2-4

Table 2: pyrite cinder wet magnetic separation result

Project	Pyrite cinder (%)		Magneticstrength	Concentrate grade (%)		The rate of recovery (%)
	Pyrite cinder (%)			Concentrate grade (%)		The rate of recovery (%)		Iron	Sulphur	Iron	Sulphur	Iron	Sulphur
	Example 1	45.50		0.52	Middle magnetic, weak magnetic, middle magnetic	61.70	0.28	Iron	Sulphur	Iron	Sulphur	Iron	Sulphur	79.50	29.13
Example 2	Example 1	45.50	45.58	0.52	Middle magnetic, weak magnetic, middle magnetic	61.70	0.28	0.51	Middle magnetic, weak magnetic, middle magnetic	59.26	0.32	4.20	37.09	79.50	29.13
Example 2	Example 3	34.65	45.58	0.54	Middle magnetic, weak magnetic, middle magnetic	58.03	0.33	0.51	Middle magnetic, weak magnetic, middle magnetic	59.26	0.32	4.20	37.09	88.20	38.81

Table 3 reduction waving of chlorination and the comprehensive result that reclaims

Ratio of components (weight part)						Temperature ℃	Time min	Dry bulb nodulizing composition (%)				Qualified iron ball nodulizing composition (%)				Recovery rate of valuable metals (%)
Ratio of components (weight part)								Dry bulb nodulizing composition (%)				Qualified iron ball nodulizing composition (%)				Recovery rate of valuable metals (%)			Project	Burn the slag concentrate	Coke powder	MgCl ₂	FeCl ₂ FeCl ₃	Urea-formaldehyde resin adhesive	Fe	Pb	Zn	Cu	Fe	Pb	Zn	Cu	Pb	Zn	Cu
Example 1	100	7	0	4	1			900	30	52.46	0.29	0.44	0.21	61.24	0.037	0.061	0.091	89.60	Project	Burn the slag concentrate	Coke powder	MgCl ₂	FeCl ₂ FeCl ₃	Urea-formaldehyde resin adhesive	Fe	Pb	Zn	Cu	Fe	Pb	Zn	Cu	Pb	Zn	Cu	87.76	56.1
Example 1	100	7	0	4	1	Example 2	100	900	30	52.46	0.29	0.44	0.21	61.24	0.037	0.061	0.091	89.60	7	2	6	1	1000	30	50.21	0.28	0.42	0.20	62.44	0.011	0.095	0.086	96.09	78.91	55.7	87.76	56.1
Example 3	100	7	2	6	1	Example 2	100	1050	30	50.21	0.28	0.42	0.21	62.52	0.009	0.045	0.073	97.15	7	2	6	1	1000	30	50.21	0.28	0.42	0.20	62.44	0.011	0.095	0.086	96.09	78.91	55.7	91.29	66.3

Claims

1, a kind of comprehensive recovering process of pyrite cinder is characterized in that comprising the preparation of wet magnetic separation, qualified iron ball nodulizing and the recovery of valuable metal, and operation steps is as follows:

1) pyrite cinder carries out three sections wet magnetic separations, filters, and gets concentrate and filtrate A and chats and coarse grain mine tailing;

2) step 1) gained concentrate and iron(ic) chloride, magnesium chloride, coke powder and urea urea-formaldehyde resin adhesive are carried out the cylinder batching, it is dry to granulate, and must do pellet ore and ash content, then, dried pellet ore is reduced chloridizing volatilization, qualified iron ball nodulizing and mix flue dust;

3) with step 2) ash content of granulating when dry carries out three grades of wet dust collections, filter, liquor B and filter residue, filter residue returns step 2) in the cylinder batching, simultaneously, to step 2) in the mixing flue dust that produces during chloridizing volatilization of reduction gather dust, volatile matter and flue dust, flue dust returns the cylinder batching, volatile matter carries out three sections water-cooleds and absorbs, absorption liquid is filtrate A and liquor B, gets absorption liquid and precipitation, adds sulfuric acid in precipitation, filter, get the lead sulfate precipitation, absorption liquid is carried out conventional iron replacement, filter, get copper precipitation and liquor C, in liquor C, add calcium hydroxide and carry out the lime neutralization, filter, get zinc hydroxide precipitation and filtrate D, adding ammoniacal liquor in filtrate D reduces, reduced liquid, add hydrochloric acid then after, return cylinder batching.

2, the comprehensive recovering process of pyrite cinder as claimed in claim 1, three sections wet magnetic separations that it is characterized in that step 1) are, pyrite cinder carries out magnetic throwing tail ore dressing in the wet type earlier, magnetic field boundary intensity 2400～2800 Gausses, get coarse grain mine tailing and concentrate A, concentrate A is carried out carrying out the wet type weak magnetic beneficiation behind the overflow ball milling, magnetic field boundary intensity 1200～1600 Gausses get chats 1 and concentrate B, again concentrate B are carried out magnetic concentration in the wet type, magnetic field boundary intensity 3600～4000 Gausses, get concentrate C and chats 2, when the iron level in chats 1 and the chats 2 is higher than 15%, merge with concentrate C, be lower than at 15% o'clock and the coarse grain mine tailing merges, again with step 3) in reduced liquid merge.

3, the comprehensive recovering process of pyrite cinder as claimed in claim 2 is characterized in that the granularity of concentrate A is 200～325 orders behind the overflow ball milling.

4, ask the comprehensive recovering process of 1 described pyrite cinder as right, it is characterized in that step 2) in the proportioning of concentrate, iron(ic) chloride, magnesium chloride, coke powder and urea urea-formaldehyde resin adhesive be 100: 4～6: 0～2: 7: 1 by weight.

5, ask the comprehensive recovering process of 1 described pyrite cinder as right, it is characterized in that adding in the step 3) vitriolic concentration expressed in percentage by weight is 98%.。

6, the comprehensive recovering process of pyrite cinder as claimed in claim 1, the concentration expressed in percentage by weight that it is characterized in that adding in the step 3) hydrochloric acid is 31%～38%, add-on is 1% of a concentrate total amount.