CN114890448A - Resource treatment method of desulfurized gypsum - Google Patents

Resource treatment method of desulfurized gypsum Download PDF

Info

Publication number
CN114890448A
CN114890448A CN202210650588.XA CN202210650588A CN114890448A CN 114890448 A CN114890448 A CN 114890448A CN 202210650588 A CN202210650588 A CN 202210650588A CN 114890448 A CN114890448 A CN 114890448A
Authority
CN
China
Prior art keywords
desulfurized gypsum
pellets
stone coal
resource treatment
treatment method
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210650588.XA
Other languages
Chinese (zh)
Inventor
闫柏军
苗祥周
张�杰
邓腾飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Science and Technology Beijing USTB
Original Assignee
University of Science and Technology Beijing USTB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of Science and Technology Beijing USTB filed Critical University of Science and Technology Beijing USTB
Priority to CN202210650588.XA priority Critical patent/CN114890448A/en
Publication of CN114890448A publication Critical patent/CN114890448A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/46—Sulfates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B11/00—Calcium sulfate cements
    • C04B11/02—Methods and apparatus for dehydrating gypsum
    • C04B11/024—Ingredients added before, or during, the calcining process, e.g. calcination modifiers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B11/00—Calcium sulfate cements
    • C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
    • C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
    • C04B11/264—Gypsum from the desulfurisation of flue gases
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention provides a resource treatment method of desulfurized gypsum, and relates to the technical field of solid waste resource treatment. The method takes the high-carbon stone coal and the desulfurized gypsum as raw materials, and realizes the recycling treatment of the desulfurized gypsum through the steps of raw material mixing, blending, pellet preparation, pellet roasting and the like. Compared with the traditional treatment method, the method provided by the invention effectively reduces the decomposition temperature of the desulfurized gypsum, avoids the problems of poor air permeability of the pellets and reduction of desulfurization rate in the sintering process in the roasting process, and successfully realizes the efficient recovery of sulfur resources in the desulfurized gypsum in a low-energy-consumption mode.

Description

Resource treatment method of desulfurized gypsum
Technical Field
The invention relates to the technical field of solid waste recycling treatment, in particular to a recycling treatment method of desulfurized gypsum.
Background
The desulfurized gypsum is mainly composed of CaSO 4 ·2H 2 The industrial solid waste of O, which is a byproduct of the treatment of desulfurized flue gas, mainly comes from steel plants and coal-fired power plantsThe FDG technology of (1). In recent years, the economic level of China is rapidly developed, the demand on the aspects of electric power and steel yield is continuously increased, and the yield of the desulfurized gypsum is increased year by year. The common treatment mode of the desulfurized gypsum in China is used for the building material industry, and the desulfurized gypsum is stacked for a long time or directly buried, so that a large amount of land resources are occupied, and a great potential threat is generated to the environment. The problems of low utilization rate of the desulfurized gypsum, low added value of products and difficult recycling of sulfur resources are difficult to solve.
The high-carbon stone coal is a low-calorific-value multi-metal shale ore, and has low valuable metal content, low calorific value and high gangue content, so that the gangue is difficult to be utilized on a large scale, and the main component of the high-carbon stone coal contains SiO 2 、C、Al 2 O 3 And SO 2 Small amount of Fe 2 O 3 And CaO, trace amounts of V, Cr and Mo, etc. The main utilization mode of the high-carbon stone coal is used for vanadium extraction by an oxidizing roasting-wet method, and the vanadium extraction process by the vanadium-containing stone coal wet method at the present stage is mainly applied to stone coal with low carbon content and is difficult to be applied to the high-carbon stone coal on a large scale. In particular, in recent years, the environmental requirements have become more stringent, and the oxidative roasting has increased the emission of a large amount of CO 2 And SO 2 Harmful gas, and the pressure to the environment is great.
Therefore, how to provide an energy-saving and environment-friendly desulfurization gypsum recycling treatment method and generate a product with a high added value is a technical problem to be solved urgently in the field.
Disclosure of Invention
In order to solve the problems of insufficient utilization rate of the desulfurized gypsum, low added value of products, high decomposition temperature and the like, the invention provides a resource treatment method of the desulfurized gypsum, which not only effectively reduces the decomposition temperature of the desulfurized gypsum and avoids the problems of poor air permeability of material balls and reduced desulfurization rate in the sintering process in the roasting process, but also realizes the technical effect of recycling sulfur resources in the desulfurized gypsum in a low-energy-consumption mode. The resource treatment method of the desulfurized gypsum comprises the following steps:
(1) mixing raw materials: crushing the high-carbon stone coal raw ore to the diameter of less than 1cm, then respectively drying the crushed high-carbon stone coal and the desulfurized gypsum, then carrying out ball milling for 12-24 h, and sieving through a 200-mesh sieve after ball milling to obtain high-carbon stone coal powder and desulfurized gypsum powder;
(2) uniformly mixing the ingredients: high-carbon stone coal powder, desulfurized gypsum powder and silicon carbide are mixed according to the mass ratio of 1-5: 12-18: 1-5 to obtain a mixture, and ball-milling the mixture for 3-7 h at 40-100 r/min;
(3) preparing pellets: mixing the mixture with water or alcohol for pelletizing, ageing the pellets after pelletizing, and drying the pellets after ageing is finished;
(4) roasting the pellets: and roasting the dried pellets in a protective atmosphere, and naturally cooling the roasted pellets along with the furnace temperature to finish the resource treatment of the desulfurized gypsum.
Further, the main components of the high-carbon stone coal in the step (1) are as follows: c10 wt% -20 wt%, SiO 2 50～70wt％，Al 2 O 3 5wt％～15wt％，SO 3 5wt％～15wt％，Fe 2 O 3 1wt％～5wt％，V 2 O 5 1 wt% -3 wt%; the main component of the desulfurized gypsum is CaSO 4 ·2H 2 O; the purity of the silicon carbide is not less than 90%.
Further, the drying temperature in the step (1) is 60-80 ℃, and the drying time is 24-48 h.
Further, the adding amount of water or alcohol in the step (3) is 7-15% of the total weight of the mixture.
Furthermore, the ageing time in the step (3) is 6-10 h, and the diameter of the pellet is 6-8 mm.
Further, in the step (3), the drying temperature is 60-90 ℃, and the drying time is 10-15 h.
Further, the protective atmosphere in the step (4) is one or more of argon, nitrogen, carbon monoxide, hydrogen and methane, and the gas flow is 200 mL/min.
Further, in the step (4), the roasting temperature is 800-1400 ℃, and the heat preservation time is 0.5-2 h.
Compared with the prior art, the invention has the beneficial technical effects that:
(1) the method utilizes the carbon in the high-carbon stone coal to reduce the decomposition temperature of the desulfurized gypsum, thereby greatly reducing the energy loss of the resource treatment of the desulfurized gypsum;
(2) according to the invention, the problems of poor air permeability and low desulfurization rate of the material balls caused by liquid phase generation in the roasting process can be solved by taking the silicon carbide as the additive;
(3) the invention can recover the sulfur resource in the desulfurized gypsum and produce calcium silicate with high added value for use as building material.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a flow chart of a desulfurization gypsum recycling treatment process;
FIG. 2 is an XRD pattern of the starting material of example 1 after calcination at 800 ℃.
Detailed Description
The invention provides a resource treatment method of desulfurized gypsum, which comprises the following steps:
(1) mixing raw materials: crushing the high-carbon stone coal raw ore to a diameter of 1cm, respectively drying the crushed high-carbon stone coal and the desulfurized gypsum, then carrying out ball milling for 12-24 h, and sieving through a 200-mesh sieve after ball milling to obtain high-carbon stone coal powder and desulfurized gypsum powder;
(2) uniformly mixing the ingredients: high-carbon stone coal powder, desulfurized gypsum powder and silicon carbide are mixed according to the mass ratio of 1-5: 12-18: 1-5 to obtain a mixture, and ball-milling the mixture for 3-7 h at 40-100 r/min;
(3) preparing pellets: mixing the mixture with water or alcohol for pelletizing, ageing the pellets after pelletizing, and drying the pellets after ageing is finished;
(4) roasting the pellets: and roasting the dried pellets in a protective atmosphere, and naturally cooling the roasted pellets along with the furnace temperature to finish the resource treatment of the desulfurized gypsum.
In one embodiment, the main components of the high-carbon stone coal in the step (1) are: c10 wt% -20 wt%, SiO 2 50～70wt％，Al 2 O 3 5wt％～15wt％，SO 3 5wt％～15wt％，Fe 2 O 3 1wt％～5wt％， V 2 O 5 1 wt% -3 wt%; what is needed isThe main component of the desulfurized gypsum is CaSO 4 ·2H 2 O; the purity of the silicon carbide is not less than 90%.
In one embodiment, the drying temperature in the step (1) is 60-80 ℃, and the drying time is 24-48 h.
In one embodiment, the amount of water or alcohol added in step (3) is 7-15% of the total weight of the mixture.
In one embodiment, the ageing time in the step (3) is 6-10 h, and the diameter of the pellet is 6-8 mm.
In one embodiment, the drying temperature in the step (3) is 60-90 ℃, and the drying time is 10-15 h.
In one embodiment, the protective atmosphere in step (4) is one or more of argon, nitrogen, carbon monoxide, hydrogen and methane, and the gas flow rate is 200 mL/min.
In one embodiment, the roasting temperature in the step (4) is 800-1400 ℃, and the heat preservation time is 0.5-2 h.
The technical solution provided by the present invention is further illustrated by the following examples.
The high-carbon stone coal described in the following examples mainly comprises the following components: c15.5 wt%, SiO 2 65wt％，Al 2 O 3 10wt％，SO 3 9％，Fe 2 O 3 3wt％，V 2 O 5 1.2wt％；
The main component of the desulfurized gypsum is CaSO 4 ·2H 2 O (not less than 95 wt%) and small amount of SiO 2 Impurities;
the purity of the silicon carbide is not less than 90%.
Example 1
(1) Crushing the high-carbon stone coal raw ore to a diameter of 1cm, respectively drying the crushed high-carbon stone coal and the desulfurized gypsum at 70 ℃ for 24 hours, then carrying out ball milling for 10 hours, and sieving the high-carbon stone coal and the desulfurized gypsum through a 200-mesh sieve to obtain high-carbon stone coal powder and desulfurized gypsum powder;
(2) high-carbon stone coal powder, desulfurized gypsum powder and silicon carbide are mixed according to the mass ratio of 2: 15: 3, placing the mixture in a ball mill for ball milling for 3 hours under the condition that the rotating speed is 90r/min, and fully and uniformly mixing;
(3) mixing the mixture with water accounting for 10 percent of the total weight of the mixture for pelletizing to prepare pellets with the diameter of 6-8 mm, and then placing the raw pellets in a drying oven at 60 ℃ for drying for 12 hours;
(4) and (3) placing the dried pellets into a muffle furnace, and roasting for 1.5h at 800 ℃ under the argon atmosphere.
The sulfur recovery of the desulfurized gypsum in example 1 was determined to be 48%.
Example 2
The difference from example 1 is that: the calcination temperature was 900 ℃. It was found that the sulfur recovery of desulfurized gypsum in example 1 was 57%.
Example 3
The difference from example 1 is that: the calcination temperature was 1000 ℃. It was found that the sulfur recovery of desulfurized gypsum in example 1 was 66%.
Example 4
(1) Crushing the high-carbon stone coal raw ore to a diameter of 1cm, respectively drying the crushed high-carbon stone coal and the desulfurized gypsum at 70 ℃ for 24 hours, then carrying out ball milling for 10 hours, and sieving the high-carbon stone coal and the desulfurized gypsum through a 200-mesh sieve to obtain high-carbon stone coal powder and desulfurized gypsum powder;
(2) high-carbon stone coal powder, desulfurized gypsum powder and silicon carbide are mixed according to the mass ratio of 4: 14: 2, placing the mixture in a ball mill, and performing ball milling for 3 hours in a condition that the rotating speed is 90r/min to fully mix the mixture;
(3) mixing the mixture with water accounting for 12 percent of the total weight of the mixture for pelletizing to prepare pellets with the diameter of 6-8 mm, and then placing the raw pellets in a drying oven at 60 ℃ for drying for 12 hours;
(4) placing the dried pellets into a muffle furnace, and roasting at 800 ℃ for 1.5h under the argon atmosphere
It was found that the sulfur recovery of desulfurized gypsum in example 1 was 43%.
Example 5
The difference from example 4 is that: the calcination temperature was 900 ℃. It was found that the sulfur recovery of desulfurized gypsum in example 1 was 61%.
Example 6
The difference from example 4 is that: the calcination temperature was 1000 ℃. It was found that the sulfur recovery of desulfurized gypsum in example 1 was 72%.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (8)

1. A resource treatment method of desulfurized gypsum is characterized by comprising the following steps:
(1) mixing raw materials: crushing high-carbon stone coal raw ore to the diameter of less than 1cm, respectively drying the crushed high-carbon stone coal and desulfurization gypsum, then carrying out ball milling for 12-24 h, and sieving through a 200-mesh sieve after ball milling to obtain high-carbon stone coal powder and desulfurization gypsum powder;
(2) uniformly mixing the ingredients: high-carbon stone coal powder, desulfurized gypsum powder and silicon carbide are mixed according to the mass ratio of 1-5: 12-18: 1-5 to obtain a mixture, and ball-milling the mixture for 3-7 h at 40-100 r/min;
(3) preparing pellets: mixing the mixture with water or alcohol for pelletizing, ageing the pellets after pelletizing, and drying the pellets after ageing is finished;
(4) roasting the pellets: and roasting the dried pellets in a protective atmosphere, and naturally cooling the roasted pellets along with the furnace temperature to finish the resource treatment of the desulfurized gypsum.
2. The method for recycling desulfurization gypsum according to claim 1, wherein the main components of the raw ore of high-carbon stone coal in the step (1) are: c10 wt% -20 wt%, SiO 2 50～70wt％，Al 2 O 3 5wt％～15wt％，SO 3 5wt％～15wt％，Fe 2 O 3 1wt％～5wt％，V 2 O 5 1 wt% -3 wt%; the main component of the desulfurized gypsum is CaSO 4 ·2H 2 O; the above-mentionedThe purity of the silicon carbide is not less than 90 percent.
3. The method for recycling desulfurized gypsum according to claim 1, wherein the drying temperature in step (1) is 60-80 ℃ and the drying time is 24-48 h.
4. The resource treatment method of desulfurized gypsum according to claim 1, wherein the addition amount of water or alcohol in step (3) is 7-15% of the total weight of the mixture.
5. The resource treatment method of desulfurized gypsum according to claim 1, wherein the aging time in step (3) is 6-10 h, and the diameter of the pellets is 6-8 mm.
6. The resource treatment method of desulfurized gypsum according to claim 1, wherein the drying temperature in step (3) is 60-90 ℃ and the drying time is 10-15 h.
7. The method for recycling desulfurized gypsum according to claim 1, wherein the protective atmosphere in step (4) is one or more of argon, nitrogen, carbon monoxide, hydrogen and methane, and the gas flow rate is 200 mL/min.
8. The resource treatment method of desulfurized gypsum according to claim 1, characterized in that in the step (4), the roasting temperature is 800-1400 ℃, and the holding time is 0.5-2 h.
CN202210650588.XA 2022-06-09 2022-06-09 Resource treatment method of desulfurized gypsum Pending CN114890448A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210650588.XA CN114890448A (en) 2022-06-09 2022-06-09 Resource treatment method of desulfurized gypsum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210650588.XA CN114890448A (en) 2022-06-09 2022-06-09 Resource treatment method of desulfurized gypsum

Publications (1)

Publication Number Publication Date
CN114890448A true CN114890448A (en) 2022-08-12

Family

ID=82728007

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210650588.XA Pending CN114890448A (en) 2022-06-09 2022-06-09 Resource treatment method of desulfurized gypsum

Country Status (1)

Country Link
CN (1) CN114890448A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115386725A (en) * 2022-08-31 2022-11-25 武汉钢铁有限公司 Recycling treatment method for metallurgical iron-containing desulfurization solid waste

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1974465A (en) * 2006-12-01 2007-06-06 华南理工大学 Process of preparing portland cement with waste ceramic tile polishing material
CN101314462A (en) * 2008-07-07 2008-12-03 昆明理工大学 Reclamation comprehensive utilization method for desulfurized gypsum
WO2011096604A1 (en) * 2010-02-05 2011-08-11 한국지질자원연구원 Calcium aluminate clinker using waste material and manufacturing method thereof
CN108178634A (en) * 2018-02-08 2018-06-19 陕西科谷新材料科技有限公司 The preparation method of Sialon silicon carbide ceramics
CN108558374A (en) * 2018-07-03 2018-09-21 贵州大学 A kind of technique of ardealite and coal ash for manufacturing High-abrasion-resisthigh-temperature-resceramic high-temperature-resceramic ceramic coproduction acid
CN109809455A (en) * 2017-11-19 2019-05-28 孔祥圣 A kind of technique preparing seven H 2 O calcium sulphates
CN113929412A (en) * 2021-12-16 2022-01-14 湖南省交通科学研究院有限公司 Recycling treatment method and paving material for stone coal vanadium extraction tailings

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1974465A (en) * 2006-12-01 2007-06-06 华南理工大学 Process of preparing portland cement with waste ceramic tile polishing material
CN101314462A (en) * 2008-07-07 2008-12-03 昆明理工大学 Reclamation comprehensive utilization method for desulfurized gypsum
WO2011096604A1 (en) * 2010-02-05 2011-08-11 한국지질자원연구원 Calcium aluminate clinker using waste material and manufacturing method thereof
CN109809455A (en) * 2017-11-19 2019-05-28 孔祥圣 A kind of technique preparing seven H 2 O calcium sulphates
CN108178634A (en) * 2018-02-08 2018-06-19 陕西科谷新材料科技有限公司 The preparation method of Sialon silicon carbide ceramics
CN108558374A (en) * 2018-07-03 2018-09-21 贵州大学 A kind of technique of ardealite and coal ash for manufacturing High-abrasion-resisthigh-temperature-resceramic high-temperature-resceramic ceramic coproduction acid
CN113929412A (en) * 2021-12-16 2022-01-14 湖南省交通科学研究院有限公司 Recycling treatment method and paving material for stone coal vanadium extraction tailings

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
NAOTO MIHARA ET AL.: ""Reductive decomposition of waste gypsum with SiO2, Al2O3，and Fe2O3 additives"", 《J MATER CYCLES WASTE MANAG》 *
刘永明等: "脱硫石膏在不同条件下的脱硫率", 《材料导报》 *
樊发家等译: "《石膏的研究与应用 增订第3版》", 31 December 1963, 北京：中国工业出版社 *
汪平等: "采用氧化焙烧-酸浸法从高碳石煤中提钒试验研究", 《中南大学学报(自然科学版)》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115386725A (en) * 2022-08-31 2022-11-25 武汉钢铁有限公司 Recycling treatment method for metallurgical iron-containing desulfurization solid waste
CN115386725B (en) * 2022-08-31 2024-03-26 武汉钢铁有限公司 Resource treatment method for metallurgical iron-containing desulfurization solid waste

Similar Documents

Publication Publication Date Title
CN101586172B (en) Method for preparing metallized pellet and reduced iron powder
CN101708826B (en) Method for reducing and decomposing phosphogypsum by sulfur
CN108359792B (en) Acid oxidation pellet of titanium concentrate and vanadium iron concentrate bulk concentrate and preparation method thereof
CN111285390B (en) Method for comprehensively utilizing industrial gypsum calcium-sulfur resources
CN110404936B (en) Comprehensive treatment method for semi-dry desulfurized fly ash
CN110845159A (en) Preparation method for producing portland cement clinker by coal gangue
CN102534195B (en) Gold extraction process method for refractory gold ore
CN108913875A (en) A kind of mill leaching pretreating process of difficult-treating gold mine
CN114890448A (en) Resource treatment method of desulfurized gypsum
CN103468343A (en) Sulfur-fixing agent for carbon-containing pellets and preparation method thereof
CN113333770B (en) Preparation method of powder metallurgy iron powder
CN102534192A (en) Method for producing manganous oxide ore powder by reducing low-grade manganese oxide ore by using biomass gas
CN112210634B (en) Method and device for preparing nickel-molybdenum-iron alloy from low-grade nickel-molybdenum ore
CN101708825B (en) Method for preparing calcium sulfide by reducing and decomposting gypsum through sulfur
CN110395751B (en) Method for extracting lithium sulfate from lepidolite
CN110358909B (en) Method for green and efficient utilization of carbon in high-carbon vanadium-containing stone coal and pre-enrichment of vanadium
CN115286266B (en) Carbon-negative clinker prepared from phosphogypsum and preparation method of carbon-negative clinker
CN103266230A (en) Vanadium-containing stone coal shaft furnace oxygen-rich roasting system and method thereof
CN101638703B (en) Method for directly reducing nickel containing pig iron by lateritic nickel in tunnel kiln
CN114015873A (en) Method for preparing manganese-silicon alloy from lithium ore and enriching lithium
CN110894572B (en) Additive for reducing roasting temperature of high-silicon magnetite concentrate pellets and application method thereof
CN102492832A (en) Method for roasting vanadium-containing bone coal by utilization of rich oxygen
CN115026107A (en) Method for desulfurizing desulfurization gypsum by using high-carbon stone coal
CN105753056B (en) A kind of method for preparing manganese sulfate
CN106430196B (en) A kind of method that Mn oxide gas-based reduction prepares manganess carbide

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination