CN105293448B - A kind of method of Recovered sulphur slag and pyrite-based sulfuric acid production - Google Patents
A kind of method of Recovered sulphur slag and pyrite-based sulfuric acid production Download PDFInfo
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Abstract
The invention discloses a kind of method of Recovered sulphur slag and pyrite-based sulfuric acid production, belong to sulfuric acid preparing technical field.This method includes：By sulfur residue and troilite in mass ratio 1:3.5 4.5, which carry out mixing, crushes, and the compound after crushing is sent into fluidized bed furnace and produces sulfur dioxide gas, and sulfuric acid is obtained after removing dust, purification, conversion and absorption；Wherein, the sulfur residue is waste residue caused by the Rong Liu workshop sections filtering of acid production with sulphur technique.This patent also discloses the device for realizing the above method simultaneously.This method and its device have the following advantages that：1st, compound is very easy to broken, and in the absence of the danger caught fire.2nd, sulfur residue is maximumlly make use of, and post-order process will not be impacted.3rd, solve the problems, such as that fluidized bed furnace scabs, and be to occur without the problem of scabbing in the higher situation of sulfur content.
Description
Technical field
The invention belongs to technical field of fertilizer production, the method for more particularly to a kind of Recovered sulphur slag and pyrite-based sulfuric acid production and
Its device, more particularly to a kind of sulphur and the method and its device of troilite joint relieving haperacidity.
Background technology
Sulfuric acid is most active binary inorganic acid, can be reacted with many metals.The sulfuric acid of high concentration has strong suction
It is water-based, it can be used as the material of the carbohydrate containing such as dehydrating agent, carbonized wood, paper, ramie cotton fabric and biological skin and flesh.Mixed with water
During conjunction, a large amount of heat energy can be also released.It has strong corrosivity and oxidisability, therefore need to use with caution.It is a kind of important work
Industry raw material, available for manufacture fertilizer, medicine, explosive, pigment, detergent, battery etc., also it is widely used in purifying oil, gold
In the industry such as category smelting and dyestuff.Chemical reagent is commonly used for, can be used as dehydrating agent and sulfonating agent in organic synthesis.
Substantial amounts of sulfuric acid can be used during chemical fertilizer production, such as preparing phosphoric acid by wet process, adjustment pH value or former as reaction
Material etc., generally use two ways carrys out Sulphuric acid for fertilizer enterprises：Acid production with sulphur and pyrite-based sulfuric acid production.Its technical process
It is as follows：
The process of pyrite-based sulfuric acid production includes roasting, gas purification, conversion and dries four parts such as absorption, and roasting process is will
Powdery troilite generates sulfur dioxide gas in fluidized bed furnace, sulfur dioxide gas caused by fluidized bed furnace through recuperation of heat, dedusting, wash
Conversion workshop section is sent into after washing and drying, then after multi-stage heat exchanger and multi-stage conversion, finally absorbs and obtains the sulfuric acid of high concentration, its
In, the investment of roasting accounts for the significant portion of gross investment（About 30%-40%）, typically at least want two fluidized bed furnace work.
Specifically, Application No. CN201410478737.4 patent discloses a kind of sulfuric acid production process, including following
Step：
(1) crush and sieve：Select troilite to be crushed from ore, small of 4-5mm troilite are selected by screening
Grain.
(2) calcining process；Above-mentioned troilite little particle to be sent into fluidizing reactor, mixing air carries out calcination,
Temperature control generates the furnace gas containing sulfur dioxide and discharged at the top of fluidizing reactor, slag is arranged through slag-drip opening at 850-950 DEG C
Go out.
(3) cleaning procedure；Furnace gas is cooled to about 350 DEG C in waste heat boiler, the stove in furnace gas is removed through cyclone dust collectors
Dirt, cooled into cleaning system with dedusting, while remove the sulfuric acid mist in furnace gas and solid particles, the gas of discharge, temperature control
System is below 40 DEG C.
(4) recuperation of heat is reacted：It is provided with evaporation of vapours in waste heat boiler in step (3) to restrain, furnace gas cools down what is obtained
Reaction heat, water circulation system or other therrmodynamic systems are delivered to through evaporation of vapours tube bank.
(5) drying process；The gas that will be obtained in step (3), is dried in drying tower with concentrated sulfuric acid drier,
The heat of release recycles after acid cooler absorbs simultaneously.
(6) conversion procedure；The gas obtained in step (5) is entered into conversion system through sulphur dioxide blower, urged in vanadium
It is sulfur trioxide gas by the oxidizing sulfur dioxide in former furnace gas under the catalytic action of agent.
(7) process is absorbed；By sulfur trioxide gas obtained above through intermediate absorber and final absorption tower, you can obtain
Sulfuric acid.
Acid production with sulphur process includes Rong Liu workshop sections, burns sulphur and Sulphur Dioxide workshop section, sulfur trioxide absorption workshop section, the party
Method has relative to preceding method：Undesirable gas purifies, and technique is simple, waste residue is yielded poorly, production is stablized and is invested low excellent
Point, but Sulfur price is more much higher than the price of troilite, and the prices fluctuate much, thus each chemical fertilizer factory according to self-condition and
The acquisition complexity of raw material uses different technique, and some enterprises combine and prevented Sulfur price fluctuation to system due to the old and new
Acid impacts, and it generally all has pyrite-based sulfuric acid production and acid production with sulphur equipment, can use different relieving haperacidity according to different situations
Technique.
Application No. CN201310252170.4 patent discloses a kind of method that sulphur prepares sulfuric acid, including following step
Suddenly：
(1) sulphur is delivered at sulfur melting slot charge door by conveyer.
(2) sulphur is sent into sulfur melting slot and melted, and molten sulfur, which is sent in the sulfur furnace for burning sulphur conversion section, to burn.
(3) air-blaster is located at drying tower upstream, i.e., sulphur burn and conversion needed for air be filtered, air blast
Enter drying tower bottom of towe after machine pressurization, the moisture in air is fallen with 98% sulfuric acid absorption use moisture in tower dry air to reach
0.1g/Nm3, through tower top demister remove acid mist after dry air enter sulfur furnace.
(4) finished product sulfuric acid is drawn by drying tower circulating-pump outlet.
For pyrite-based sulfuric acid production technique, in calcining process, fluidized bed furnace easily scabs, and causes boiling effect bad, and
For acid production with sulphur technique, although its caused waste residue is less, in Rong Liu workshop sections, average sulphur per ton produces sulphur
Slag about 0.65%, can not be utilized.Specifically, for sulfuric acid 2 × 400kt/a of production capacity production line, Rong Liu workshop sections filter when
Separate unit filter can discharge at least sulfur residue of 15t/ times.Then for 2 × 40wt acid production with sulphur production lines, sulfur residue is produced every year
1733t.Containing 60% or so sulphur in sulfur residue, a small amount of filter aid, ash content and organic matter, benefit is not managed for it.
Certainly, also there is the method for combining relieving haperacidity with troilite using sulphur in the prior art.
Wherein, a kind of method of troilite mixing-burning sulphur production sulfuric acid of Publication No. CN1456494A disclosure of the invention,
Boiling furnace combustion generation SO is sent into after low-grade sulphur is mixed with troilite, slag2Gas, removing dust, purification, conversion,
The concentrated sulfuric acid is made in absorption, and its Main Means is improved into furnace charge sulfur content, is saved production cost, is improved sulphuric acid output.Wherein, mix
The sulfur content for closing material is respectively 33% and 35%.
Wherein, a kind of sulfur waste of Publication No. CN103043625A disclosure of the invention, which is mixed, burns ferrous sulfate waste material and prepares
The method of sulfuric acid, this method comprise the following steps：
A) sulfur waste and ferrous sulfate waste material are dried, sulfur waste is dehydrated into the thick sulphur of granular, ferrous sulfate
Ferrous sulfate monohydrate compound is obtained after dehydrate waste materials.
B) dried sulfur waste and ferrous sulfate waste material are well mixed, wherein, sulphur and sulfuric acid in sulfur waste
The weight ratio of ferrous sulfate monohydrate is 3 in ferrous waste material：7-7：3, preferably 1:1.
C) mixed material in step b) being added into boiling kiln roasting, sintering temperature is 850-1000 DEG C, is passed through air,
Gas velocity is 1.0-2.0 meter per seconds, and residence time of the mixed material in fluidized bed furnace is the 4-16 seconds, sulfur dioxide in furnace gas after roasting
Volumetric concentration is 9-12%.
D) sulfuric acid is made through supercooling, washing, purifying, conversion absorption section in the furnace gas containing sulfur dioxide in step c).
Wherein, the sulfur waste sulphur that sulfur waste reclaims during synthesis ammonia, coke oven gas desulfurization, wherein, sulfur waste
Dried thick Sulfur from Sulphur sulphur content is more than 60% weight, and other Main Ingredients and Appearances are (NH4)2SO4 (NH4) SCN, Yi Jiwei
The tar of amount, benzene, naphthalene etc., the sulfur containing waste material after power plant, aluminium manufacturer's desulfurization can also be used；Ferrous sulfate waste material comes from titanium dioxide row
Waste Sulfuric Acid caused by industry is ferrous, and wherein ferrous sulfate heptahydrate content is more than 85% weight, and epsom salt is 3-8% weight, with
And micro Manganese sulfate pentahydrate, aluminum sulfate octadecahydrate, calcium sulphate dihydrate, titanyl sulfate etc..
Although above-mentioned patent 1 and 2 has used sulphur and production of sulfur from pyrite acid simultaneously, there is problems with it：1, specially
Profit 1 and 2 does not solve the problems, such as that fluidized bed furnace scabs；In the prior art, solve below the problem generally use that scabs of fluidized bed furnace
Means：1. strictly material sulfur-bearing in control stove（For general sulfur content 35% or so, maximum is no more than 40%）, control brownish black slag behaviour
Make, prevent high temperature from scabbing；2. meet temperature rise sharply will the spray cooling into stove immediately, or enter the slag cooling of humidity, treat that temperature drops
During to normal value, conventional treatment is remake；3. if it is determined that having been scabbed in stove, first blowing out, then organize beat scar, beat scar it is noted that
Safety, prevents from burning.2nd, block sulphur and troilite are separated into progress two level mixing after one-level crushes in patent 1 to crush, then
Sieve standby, it is found by the applicant that being very easy in shattering process is carried out to block sulphur on fire, conventional disintegrating machine is at all real
It is now not broken.3rd, it is not easy to individually use sulfur cream sulfuric acid, individually purchases sulphur using low-grade sulphur in patent 1
Sulphur waste material is not calculated.4th, sulphur and ferrous sulfate are industrial waste in patent 2, and sulfur-bearing is unstable, are unfavorable for follow-up system
Sour process；5th, need to carry out drying and processing to powdered scrap in patent 2, workload is big.
The content of the invention
In order to solve the above problems, the embodiments of the invention provide a kind of method of Recovered sulphur slag and pyrite-based sulfuric acid production and
Its device, caused waste residue during acid production with sulphur is recycled.The technical scheme is as follows：
On the one hand, the embodiments of the invention provide a kind of method of Recovered sulphur slag and pyrite-based sulfuric acid production, this method to include：
By sulfur residue and troilite in mass ratio 1:3.5-4.5 carries out mixing and crushed, and the compound after crushing is sent into fluidized bed furnace and produced
Sulfur dioxide gas, sulfuric acid is obtained after removing dust, purification, conversion and absorption；Wherein, sulfur residue is the molten sulphur of acid production with sulphur technique
Waste residue caused by workshop section's filtering, its sulfur content is about 60% or so, and other impurities are filter aid（Mainly diatomite, Tu is in filtering
Help to filter in equipment）, ash content, organic matter etc..Wherein, acid production with sulphur technique is identical with existing process, be calcined in the present invention,
The processes such as gas purification, conversion and dry absorption are identical with existing process.In the present invention maximum using sulfur residue to keep away
Exempt from sulfur residue accumulation, do not impact but not to post-order process, also solve the problem of fluidized bed furnace scabs.Meanwhile compound
Can directly it crush, will not be on fire；In addition, also reduce broken difficulty.
Wherein, the troilite in the embodiment of the present invention is pyrite concentrate, wherein, sulphur：35-40%（Usual preferably ore deposit sulfur content
For 38%-40%）, water：9-10%, iron：40% or so, it is mass content above.
Wherein, the sulphur that the acid production with sulphur technique in the embodiment of the present invention uses is the byproduct of Petroleum refining, and its sulphur contains
Amount is more than 95%, and the sulfur content of generally commercially available byproduct sulphur is more than 99%, can be directly used for acid production with sulphur.
Preferably, sulfur residue and troilite in mass ratio 1:4, which carry out mixing, crushes.
Wherein, the temperature of Rong Liu workshop sections is 135-145 DEG C.
Wherein, sulfur residue and troilite are mixed when mixing is broken and is crushed to below 5mm, be typically crushed to 3-5mm.Enter
One step, mixing broken detailed process is, jaw crusher, impact crushing are passed sequentially through after sulfur residue and troilite are mixed
Fluidized bed furnace is sent into after machine and separating sieve.
On the other hand, the embodiment of the present invention additionally provides a kind of Recovered sulphur slag and pyrite-based sulphuric acid plant, including sulphur
Acid making system and pyrite-based sulfuric acid production system, described device also include crushing structure, the Rong Liu workshop sections of the sulphur-burning sulphuric acid system
The fluidized bed furnace of filtration, crushing structure and pyrite-based sulfuric acid production system is sequentially connected by conveyer belt.
Specifically, the crushing structure in the embodiment of the present invention include be sequentially connected jaw crusher, impact crusher and
The filtration of separating sieve, the charging aperture of the jaw crusher and the Rong Liu workshop sections of sulphur-burning sulphuric acid system is connected by conveyer belt
Connect, the discharging opening of the separating sieve is connected by conveyer belt with the fluidized bed furnace of pyrite-based sulfuric acid production system, the coarse fodder of the separating sieve
Outlet is connected by the charging aperture of conveyer belt and impact crusher.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
1st, compound is very easy to broken, and in the absence of the danger caught fire.
2nd, sulfur residue is maximumlly make use of, and post-order process will not be impacted.
3rd, solve the problems, such as that fluidized bed furnace scabs, and be to occur without the problem of scabbing in the higher situation of sulfur content（Just
It is very easy to the problem of scabbing occur under the sulfur content in the case of often, knot can be produced when the sulphur crystal sand of high sulfur content is used alone
Scar problem）.
Brief description of the drawings
Fig. 1 is the structured flowchart of Recovered sulphur slag and pyrite-based sulphuric acid plant provided in an embodiment of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with accompanying drawing
It is described in detail on step ground.
Embodiment 1
Using the byproduct sulphur of the Petroleum refining of sulfur content 99%, molten sulphur is carried out under the conditions of 140 DEG C, after the completion of filter,
Filter residue and the pyrite concentrate in mass ratio 1 of sulfur content 38%:Jaw crusher is sent into after 4 mixing together just crush, crushes and completes
It is broken that impact crusher progress essence is sent into afterwards, separating sieve is sent after the completion of broken, and granularity send fluidized bed furnace less than 5mm, and granularity is big to be returned
Impact crusher is returned to be crushed again.Fluidized bed furnace carries out calcination with air under conditions of 900 DEG C or so and produces dioxy
Change sulphur, sulfuric acid is obtained after sulfur dioxide gas removing dust, purification, conversion and absorption.
Specifically, this method has a preferable economic benefit, and theoretical calculation is as follows：
Acid production with sulphur workshop drives to consume 43.53wt sulphur so far, adds up the sulfur residue 2813.28t stacked.With the data
Sulphur averagely per ton can be calculated and produce sulfur residue about 0.65%.
2 × 40wt acid production with sulphur presses workshop, and consume sulphur amount by acid per ton calculates for 0.3t, then consumes sulphur every year
26.7wt, then sulfur residue 1733t is produced every year.Traffic expense of the sulfur residue per ton from acid production with sulphur workshop to pyrite-based sulfuric acid production workshop
It is assumed that 2 yuan（It is located at Liang Ge plant areas respectively, it is such as lower in same plant area, price）.Being detected simultaneously by amount containing S in sulfur residue is about
60%。
2nd, theoretical sulfur residue production sulfuric acid amount per ton
The yield that sulfuric acid is produced using sulfur residue is about w=1733 × 0.60 × 98.0% × 98/32t=3120t within 1 year, then often
It is Q1=1.8t/t that ton sulfur residue, which produces sulfuric acid amount,.By 360 yuan/ton of calculating of market price, P=3120t × 360 yuan/t- can be obtained every year
1733t × 2 yuan/111.97 ten thousand yuan of t=1119734 yuan ≈.
3rd, calculate sulfur residue per ton by method output capacity and produce sulfuric acid amount
Troilite scum sulfur content average out to 1.0% after roasting.If come out iron through over cure two system after addition sulfur residue
Sulfur content is 1.5% in slag, then：Using sulfur residue produce per year acid amount W=1733 ×（60%-1.5%）×99.5%×95%×98%×
98/32t=2876.1t（Burning yield=95%, absorptivity=99.5%, conversion ratio=98%）, then sulfur residue per ton produce sulfuric acid amount be Q=
1.66t/t；By 360 yuan/ton of calculating of market price, P=2876.1t × 360 yuan/t-1733t × 2 yuan/t=1031930 can be obtained every year
First 103.19 ten thousand yuan of ≈.
Embodiment 2
Embodiment 2 is tested to various conditions, and its acid preparation method is substantially the same manner as Example 1, and difference is sulphur
The proportioning of sulphur slag and troilite is different（In mass ratio）：Processing 1：Sulfur residue and troilite press 1:2 mixing, processing 2：Sulfur residue
1 is pressed with troilite:3 mixing, processing 3：Sulfur residue and troilite press 3:8 mixing, processing 4：Sulfur residue and troilite press 1:4 is mixed
Close, processing 5：Sulfur residue and troilite press 2:9 mixing, processing 6：Sulfur residue and troilite press 1:5 mixing, processing 7：Sulphur and sulphur
Iron ore presses 1:4 mixing, processing 8：Troilite, processing 9：Sulphur and troilite press 1:13 mixing, processing 10：Sulphur.Fluidized bed furnace knot
The measurement period of scar situation is one week, counts 12 cycles altogether, and calcining process is two classes, and calcining process is by roasting post rule
Journey operates（Notice that removal scabs hidden danger）, and remove the cycle of the accident caused by human operational error, its result such as institute of table 1
Show：
Table 1
| Processing | It is whether on fire when broken | Whether it is easy to crush | Whether fluidized bed furnace scabs | Whether subsequent handling is impacted |
| 1 | Easily catch fire | It is | It is | |
| 2 | It is no | It is | It is | It is |
| 3 | It is no | It is | Easily | Easily |
| 4 | It is no | It is | It is no | It is no |
| 5 | It is no | It is | It is no | It is no |
| 6 | It is no | Typically | Easily | It is no |
| 7 | Easily catch fire | It is | Easily | |
| 8 | It is no | It is no | Easily | It is no |
| 9 | It is no | It is no | Easily | It is no |
| 10 | It is |
Wherein, during whether fluidized bed furnace scabs：It is to scab certainly, easily more than the cycle is scabbed at least four, no is at least 10
The individual cycle does not scab.
Wherein, in whether being impacted to subsequent handling：It is to need larger change follow-up dedusting, purification, conversion and suction
The setting for sequence of knocking off and parameter, and the quality of final products can be influenceed；Yi Weihui suitably change follow-up dedusting, purification, conversion and
Absorb setting and parameter or the quality for influenceing final products of process；It is no for need not change follow-up dedusting, purification, conversion and
Setting and the parameter of process are absorbed, and does not interfere with the quality of final products.
Sulfur residue and troilite press 1 as can be seen from the above table:4 or so mixed effects are preferable.In addition, as can be seen from the above table
By controlling sulfur content, can not solve the problems, such as that fluidized bed furnace scabs in the case of high sulfur content, and identical with this patent
In the case of sulfur content, can not solve the problems, such as that fluidized bed furnace scabs.To sum up, the present invention solution fluidized bed furnace problem of scabbing is not
Only start with from control sulfur content, it is also impacted by other materials complicated in sulfur residue to fluidized bed furnace.
Embodiment 2
The embodiments of the invention provide a kind of Recovered sulphur slag and pyrite-based sulphuric acid plant, including the He of sulphur-burning sulphuric acid system 1
Pyrite-based sulfuric acid production system 3, sulphur-burning sulphuric acid system 1 include Rong Liu workshop sections 101, burn sulphur and the oxygen of Sulphur Dioxide workshop section 102 and three
Change sulphur absorption section 103 etc., pyrite-based sulfuric acid production system 3 includes roasting workshop section 301, gas purification workshop section 302, conversion section 303
With dry absorption section 304 etc..Wherein, with existing consistent, difference is foregoing two kinds of systems：Referring to Fig. 1, the present invention
The device of offer also includes crushing structure 2, and the crushing structure 2 is used to crush sulfur residue caused by sulphur-burning sulphuric acid system, and by sulphur
Sulphur slag is sent into pyrite-based sulfuric acid production system 3 and recycled.Wherein, the filtration of the Rong Liu workshop sections 101 of sulphur-burning sulphuric acid system 1（Filter residue
Outlet, specially filter press）, the fluidized bed furnace of roasting workshop section 301 that crushes structure 2 and pyrite-based sulfuric acid production system 3 pass through conveyer belt
It is sequentially connected.Also, foregoing two kinds of acid making systems can also common sparing equipment, such as drying equipment, tail gas treatment device etc..
Specifically, referring to Fig. 1, jaw crusher 201 that the crushing structure 2 in the embodiment of the present invention includes being sequentially connected,
Impact crusher 202 and separating sieve 203 etc..Wherein, the charging aperture of jaw crusher 201 and the molten sulphur work of sulphur-burning sulphuric acid system 1
The slag-drip opening of the filtration of section 101 is by transmitting band connection, the discharging opening of separating sieve 203（Qualified material, is crushed to below 5mm）
It is connected by conveyer belt with the fluidized bed furnace of the roasting workshop section 301 of pyrite-based sulfuric acid production system 1, the coarse fodder outlet of separating sieve 203（5mm
With feeding）It is connected with the charging aperture of impact crusher 202 by conveyer belt and is crushed again.
Device provided by the invention, sulfur residue can be recycled to produce sulfuric acid, and avoid that sulphur is on fire and fluidized bed furnace knot
The problem of scar.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (3)
1. a kind of method of Recovered sulphur slag and pyrite-based sulfuric acid production, it is characterised in that by sulfur residue and troilite in mass ratio 1:4
Carry out mixing to crush, the compound after crushing is sent into fluidized bed furnace and produces sulfur dioxide gas, removing dust, purification, conversion and suction
Sulfuric acid is obtained after receipts；Wherein, the sulfur residue is waste residue caused by the Rong Liu workshop sections filtering of acid production with sulphur technique, contains drainage
Agent, ash content and organic matter；The troilite is pyrite concentrate, and its sulfur content is 35-40%；The sulphur that the acid production with sulphur technique uses
Sulphur is the byproduct of Petroleum refining, and its sulfur content is more than 95%；Jaw crushing is passed sequentially through after sulfur residue and troilite are mixed
Fluidized bed furnace is sent into after machine, impact crusher and separating sieve.
2. the method for Recovered sulphur slag according to claim 1 and pyrite-based sulfuric acid production, it is characterised in that the Rong Liu workshop sections
Temperature be 135-145 DEG C.
3. the method for Recovered sulphur slag according to claim 1 and pyrite-based sulfuric acid production, it is characterised in that by sulfur residue and sulphur
Iron ore mixing is crushed to below 5mm.
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| CN1456494A (en) * | 2003-05-09 | 2003-11-19 | 湖北宜化化工股份有限公司 | Production of sulphuric acid by firing sulphur with mixed sulphureous iron ore |
| CN102992277A (en) * | 2012-10-24 | 2013-03-27 | 马朝阳 | Method for producing sulfuric acid by using pyrite concentrate and acid-leaching electrolytic manganese residues |
| CN202912693U (en) * | 2012-11-09 | 2013-05-01 | 襄阳泽东化工集团有限公司 | Utilization system for tailings in sulfuric acid preparation |
| CN103043625B (en) * | 2012-12-31 | 2016-05-04 | 萍乡市新安工业有限责任公司 | A kind of sulphur waste material is mixed and is burnt the method that ferrous sulfate waste material is prepared sulfuric acid |
| CN104229755A (en) * | 2013-06-24 | 2014-12-24 | 王荷琴 | Method for preparing sulfuric acid from sulfur |
| CN104291276A (en) * | 2014-09-19 | 2015-01-21 | 中山市鸿程科研技术服务有限公司 | Production technology of sulphuric acid |
| CN104673995A (en) * | 2015-02-14 | 2015-06-03 | 昆明理工大学 | Method for combined recovery and sulfur removal of pyrite and magnetite |
| CN205115046U (en) * | 2015-10-23 | 2016-03-30 | 湖北祥云(集团)化工股份有限公司 | Recovered sulphur sediment and pyrite -based sulphuric acid production device |
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Denomination of invention: A Method for Recovering Sulfur Residue and Pyrite to Produce Acid Effective date of registration: 20230731 Granted publication date: 20180130 Pledgee: Bank of China Limited Huanggang branch Pledgor: HUBEI XIANGYUN (Group) CHEMICAL Co.,Ltd. Registration number: Y2023420000318 |
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