Established in 1942
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Since 1942 Strommasina Corp. has been successfully producing equipment for the mining, building, oil and gas, as well as road, metallurgical industries.

Comparative table of gypsum production schemes

Samara plant "Strommashina" has prepared the comparative table of gypsum production schemes for the website visitors. This information will be useful to all specialists related to gypsum industry. The information in new advanced format has become more convenient and understandable for the clients. Please feel free to contact us by phone (846) 244-43-83

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Gypsum building plaster
Item No. Technology Equipment manufactured by the Samara Strommashina Plant Advantages and disadvantages
1 Technology using batch action gypsum kettles Bin, soaking bin, chain elevator, cyclones, bag filters, steam pipeline, gas pipeline, belt conveyor, jaw crusher, disk feeder, shaft mill or paddle-type mill for grinding and drying gypsum, forced-draft equipment, fans, screw conveyors, heating devices, dust settling chamber, plaster-making kettles, furnace, feeders, silos Advantages: hammer (shaft) mill with a gravitational separator. It is used not only for grinding but also for gypsum drying, grinding fineness and capacity depend on gas flow rate (gas flow from fans). Disadvantages: to improve technical (plastic) properties of gypsum, it is necessary to regrind (in ball mills) the gypsum binder after boiling in the kettle.
2 Technology using continuous action gypsum kettles Bin, cyclones, elevator, bag filters (to replace electric filters), chain feeder, tray mill, furnace for the mill, fan for the mill, screw conveyors, gypsum kettle, gypsum cooler, boiler furnace, smoke exhauster, cooler fan, electric filter, exhaust gas fan Advantages: an improved flow-chart, maximum automation, due to continuous feeding of plaster powder into the kettles, a very high water steam saturation degree is maintained in them which results in improvement of modification composition and gypsum properties. Disadvantages: not applicable.
3 Technology using rotary kilns (drying drums) + 6 subtypes Bin, cyclones, drying drum, ball (tubular) mill, bag filters, feeders, crushers (as required), conveyors, furnace, smoke exhauster, screen (as required) Advantages: gypsum calcination in kilns (drying drums) can be carried out by means of direct contact with hot gases formed after burning of fuel, the fuel can be solid, liquid or gas; after grinding in the mill the material composition of the product is conditioned by transfer of underburnt and overburnt material to semihydrate. Disadvantages: as distinct from kettle boiling, the calcined product is non-homogeneous in terms of modification composition, there is much underburnt and overburnt material.
1. With one rotary kiln 2. With two rotary kilns and a cooler 3. With two rotary kilns 4. With double-drum kiln and high- and low-temperature calcination 5. With double-zone rotary kiln 6. With double-zone rotary kiln and air-lift drying
4 Technology using combined grinding and calcination devices Bins, elevator, ball mill. cyclones, bag filters, belt conveyor, jaw crusher, magnetic separator, hammer crusher, drum gate, screw conveyor, air separator, furnace (13), high-pressure fan Advantages: combined fine grinding and calcination in shaft, ball and other mills at gas temperature at the mill inlet 60 to 700 deg. C. Disadvantages: the same as in drying drum calcination.
5 Technology with calcination in fluidized-bed kiln (Gypsum Г-5…Г7) Bins, bag filter to replace electric filter, cyclone battery, discharge hopper, elevator, screw conveyor, fan, electric filter, mixing chambers, throttle, belt conveyor, disk feeder, shaft mill (12), heat generator (13), screw feeder, dehydrator kiln (18), pneumatic chamber feeders Advantages: advances calcination method - hot flue gases are fed under the gypsum raw material bed at 1 to 2 m/s flow rate so that the particles would not leave the layer but were oscillating. The bed is fluidized. Disadvantages: the flue gas parameters can only be changed in a narrow range, available heat factor is 85%, the binder quality depends on the calcination time.
6 Technology with suspension roasting in drying pipe Bins, cyclones, bag filters, drying pipe (1), gypsum calcination pipe (2), mixer (3), smoke exhauster, fan, feeders Advantages: calcination intensity is higher than in fluidized-bed kiln, the calcination is performed in ascending gas flow for a few seconds (suspended particles), high-rate calcination. Multiphase gypsum is produced, then it is mixed with additives to produce special gypsum feeds. Disadvantages: the drying pipe size depends on temperature conditions of calcination, volume and flow rate of flue gases (0.5 to 20 m) it is necessary to feed homogeneous raw material into the drying pipe because a wide range of stay duration of variously sized particles results in non-uniform change of their properties.
7 Moulding plaster production technology Bin, soaking bin, chain elevator, cyclones, bag filters, steam pipeline, gas pipeline, belt conveyor, jaw crusher, disk feeder, shaft mill or paddle-type mill for grinding and drying gypsum, forced-draft equipment, fans, screw conveyors, heating devices, dust settling chamber, plaster-making kettle, furnace, feeders, silos Advantages: production is similar to that of gypsum building plaster in kettles allowing implementing heat treatment modes with any cycle duration and based on specified temperature profile. Disadvantages: duration of moulding plaster boiling depending on the moulding plaster application varies from 2 to 4 hours, i.e. the capacity is low.
8 Medical gypsum production technology Bin, soaking bin, chain elevator, cyclones, bag filters, steam pipeline, gas pipeline belt conveyor, jaw crusher, disk feeder, shaft mill or paddle-type mill for grinding and drying gypsum, forced-draft equipment, fans, screw conveyors, heating devices, dust settling chamber, plaster-making kettle, furnace, feeders, silos Advantages: production is the same as that of moulding or modelling plaster. Disadvantages: a more thorough raw material selection is required.
High-strength gypsum
Item No. Technology Equipment manufactured by the Samara Strommashina Plant Advantages and disadvantages
9 Technology for production of high-strength gypsum with dehydration and drying in separate devices (autoclaves) Bins, elevator, drying drum (17), ball mill (23), cyclones, bag filter to replace electric filters, belt conveyor, crusher, screen, dampers (11), feeders, furnace, separator (25), pneumatic screw pump, silos, packing machine (29), fan, electric filter Advantages: gypsum rocks are steamed in the damper (autoclave) and discharged for drying and further grinding. Damping influences the semihydrate strength. Disadvantages: the total heat treatment cycle is 8 hours, low capacity.
10 Technology for production of high-strength gypsum with dehydration and drying in a single device (horizontal autoclave) Ball mill (9), bin (12), horizontal cylindrical autoclave (1), screen (2), steam pipeline (4), heat-carrying agent feeding circuit (5), heating device for heating (6), condensate discharge pipe (7), fan (8), conveyor (10), disk feeder (11) Advantages: combined material dehydration and drying process in autoclave. Disadvantages: abrupt material temperature drop (temperature dip) during pressure release in the device after dehydration. Cooling results in formation of "secondary" calcium sulphate dihydrate.
11 Technology for production of high-strength gypsum with dehydration and drying in a single device (vertical autoclave) Ball mill, bin, drying drum, cyclones, bag filters, elevators, feeders, crusher, screw conveyors, belt conveyors. The Samara Gypsum Integrated Plant's and Dekonsky Gypsum Integrated Plant's gypsum building plaster production flow diagram. Advantages: production of high-strength high-quality material. Disadvantages: the size of rocks being processed does not exceed 50 mm, which facilitates in increasing the specific surface area of rocks and creating conditions for formation of secondary dihydrate, in the vertical autoclaves setting of the gypsum to be steamed is possible if there are any fines; drying of rocks in the autoclave is difficult due to material compaction and decrease of the material void coefficient.
12 Technology of high-strength gypsum production by self-steaming (with external heating) Bins, elevators, ball mill to replace the fine-grinding mill (11), jaw crusher, autoclave in brickwork envelope (4), furnace, jaw crusher (6), hammer crusher (9), fine-grinding mill (11) Advantages: production in devices with external heating, autoclave is embedded into the kiln, external steam source is not used for binder production. Disadvantages: low production line capacity.
13 Technology of high-strength gypsum production in liquid media (aqueous solutions of salts and acids - magnesium sulphate) Bin (1), wet-grinding ball mill (2), working solution container (4), container (5), wash container (11), dry-grinding ball mill (13), semihydrate gypsum bin (14), disk feeder (2), pumps (6, 8), mixer crystallizer for chemical industry (7), CONDENSER (9), filtration unit (10), drier (12) Advantages: any possibility of formation of non-homogeneous (in terms of composition) gypsum binder is eliminated. Disadvantages: dehydration and drying is provided for in rotary filters or centrifuges – the material is not 100% dry.
Tiling plasters
Item No. Technology Description Advantages and disadvantages
14 Anhydrous cement production technology Anhydrous cement is produced by calcining gypsum raw material at 600 to 700 deg. C and further fine grinding of calcined material with additives activating setting and hardening. The most commonly used hardening agents are slaked lime or unslaked lime (2 to 5%), basic blast-furnace slag (10 to 15%) or calcined (at 800 to 900 deg. С) dolomite (3 to 8%). Also different sulphates are used as hardening agents, for example, bisulphate, sodium sulphate, copper and ferrous sulphate, etc. If calcium sulphide is present in anhydride, it is not recommended to use sulphate compounds. Advantages: not applicable. Disadvantages: not applicable.
15 Estrich gypsum production technology Estrich gypsum is produced by calcining gypsum raw material at 900 deg. C and higher temperature. Gypsum is crushed in the jaw crusher, calcined in shaft mill and ground in ball mill. Advantages: not applicable. Disadvantages: not applicable.
Non-calcined gypsum binders
Item No. Technology Description Advantages and disadvantages
16 Anhydrous binder production technology The process consists of four basic operations: crushing into pieces no more than 20 to 30 mm, drying at 170 to 180 deg. C, grinding with activating agents in a ball mill, storage for no longer than 2 months. Advantages: not applicable. Disadvantages: not applicable.
17 Non-calcined gypsum cement production technology Gypsum cement is produced by fine grinding in ball mills with addition of activating additives. To increase water-resisting properties, portland cement or slag-portland cement, granulated or dump slags, boiler ashes, crushed bricks or dolomite dust are added. Adding only lime although increases water-resisting properties, but decreases cement strength greatly. Advantages: not applicable. Disadvantages: not applicable.
Water-resistant (mixed) gypsum binders (CGB)
Item No. Technology Description Advantages and disadvantages
18 Technology for production of low water requirement composite gypsum binders The low water requirement composite gypsum binders (CGB), as distinct from GCPB, contain fine portland cement and siliceous additives produced by joint activation over plasticizer (superplasticizer) in vibration mill or ball mill. There are two CGB production process flow charts. The first one provides for preliminary grinding of portland cement with AMA of necessary hydraulic activity and superplasticizer and subsequent mixing of the produced hydraulic component with gypsum binder in a dry mix mixer. The second one is aimed at increasing initial CGB grade strength. Advantages: not applicable. Disadvantages: not applicable.
Gypsum cement puzzolan binders (GCPB)
Item No. Technology Equipment manufactured by the Samara Strommashina Plant Advantages and disadvantages
19 Gypsum cement puzzolan binder production technology Bin, bucket elevators (6, 19), drying drum (9), cyclones (10), ball mill (15), tripoli powder receiving bin (16), cement charging bin (18, 20), dry tripoli powder bin (21), apron feeder (2), jaw crusher (3), hammer crusher (4), belt conveyor (5), gypsum chippings bin (7), belt feeder (8), fan (11), box feeding device (17), cement and tripoli powder batchers (22) Advantages: possibility to use this technology in gypsum or DCM production process with adding the equipment for storage, batching and delivery of cement and preparing active mineral admixture, etc. Disadvantages: not applicable.

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