lignite
Enable an agent to recognise lignite, assess the condition and suitability of a particular lot, and identify evidence needed before handling, storing or using it.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise lignite, assess the condition and suitability of a particular lot, and identify evidence needed before handling, storing or using it.
Lignite is a low-rank coal formed by coalification of peat, typically brown to black, with high inherent moisture and a lower heating value as received than higher-rank coals.
It can be Classify a documented lot as lignite under an explicit rank system or flag insufficient evidence.; Compare lots using compatible moisture and calorific-value bases.; Request representative sampling or updated analysis when provenance, variability or weathering undermines existing results.; Assess whether a lot meets a specified fuel or processing requirement.; Evaluate proposed crushing, drying or blending against changes in energy properties, dust and storage behaviour.; Flag handling or storage conditions that require assessment under an applicable operating procedure..
Distinguishing features
Require a documented coal-rank determination to distinguish lignite from peat and subbituminous coal; colour alone is insufficient.
Treat lignite as heterogeneous coal containing organic matter and mineral constituents, rather than as a pure chemical substance with a single molecular formula.
Use moisture and calorific-value results only with their reporting basis; values measured after drying cannot directly characterise the delivered wet lot.
Check local terminology when a source says brown coal, because the name alone does not establish the rank boundary used.
Distinguish raw or conditioned lignite from carbonised char and formulated products through processing history and the resulting material identity.
Scope
+ Lignite identity and rank classification under a named classification system
+ Deposit and lot provenance, sampling and material variability
+ Moisture, organic composition, mineral matter and measured fuel properties
+ Particle size, weathering, drying and storage condition
+ Material-specific handling hazards and suitability for proposed uses
- Geological deposits, resource estimates and mineral ownership
- Mine design, extraction operations and land rehabilitation
- Boiler, power-station and emissions-control equipment
- Manufactured briquettes, activated carbon and other downstream products
- Electricity markets and energy-policy decisions
Characteristics
- Rank classification
- Named classification system, edition, assigned rank and supporting test results Establishes whether the material belongs to this model and makes regional classifications interpretable.
- Material provenance
- Deposit, seam, extraction location, supplier, lot and sample identifiers Connects measurements to the material they represent and supports investigation of variability.
- Moisture content
- Mass %, specifying total or analytical moisture, reporting basis, method and sampling time Affects delivered energy, drying requirements, handling and interpretation of other measurements.
- Calorific value
- MJ/kg, specifying gross or net value, moisture basis and method Supports fuel comparison and suitability decisions without confusing incompatible reporting conventions.
- Proximate analysis
- Mass % moisture, ash, volatile matter and fixed carbon, with method and basis for each result Characterises fuel behaviour and residue burden while distinguishing measured quantities from calculated ones.
- Elemental composition
- Mass % carbon, hydrogen, nitrogen, sulfur and oxygen, with analytical or calculation method and reporting basis Supports assessment of conversion suitability and potential emissions.
- Mineral and trace-element profile
- Identified mineral phases and element concentrations in mg/kg or mass %, with sample basis Identifies constituents that may constrain processing, emissions management and residue use.
- Particle-size distribution
- Size fractions in mm or µm and mass %, including a defined fines fraction Informs feeding, segregation, dust generation and handling decisions.
- Conditioning and weathering state
- As-mined, crushed, dried, rewetted or weathered, with treatment history and evidence of oxidation Properties and hazards can change between extraction, testing and use.
- Storage thermal condition
- Temperature in °C, trend over time, observation location and applicable site trigger levels Supports recognition and escalation of possible self-heating.
- Applicable hazard and transport status
- Jurisdiction, transport mode, classification, evidence source and assessment date; unresolved where unverified Prevents an agent from assuming that one generic material label determines every handling obligation.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.lignite
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 18 findings · 29 questions.
Lignite identity and boundaries Establishes what counts as lignite and which material a classification actually describes.
Coal-rank conventions and informal names can otherwise cause an agent to apply the model to peat, another coal rank or a manufactured derivative.
Coal-rank evidence
Connects the lignite designation to an explicit classification method.
Rank assignment
Record the assigned rank, governing system and evidence supporting its boundary with neighbouring ranks.
- Which classification system and edition define lignite for this material? definition
- Which test results, on which reporting basis, support lignite rather than peat or subbituminous coal? boundary
Names and material continuity
Resolves local names and tracks whether processing preserves the identity covered here.
Label and processing boundary
Keep commercial terminology and processing history separate from demonstrated material identity.
- Does the source use brown coal as a synonym for lignite or as a broader category? definition
- Has the material only been crushed or dried, or has carbonisation, formulation or another transformation placed it in a neighbouring product model? boundary
Provenance and representative analysis Connects a variable natural material to traceable lots, samples and defensible analytical results.
A result from one seam interval or sample cannot automatically represent an entire shipment or stockpile.
Seam-to-lot traceability
Records geological origin and the assembly of the assessed material lot.
Lot origin and blending
Identify the sources and mixing history relevant to interpreting lot properties.
- Which deposit, seam and extraction interval supplied this lot, and what evidence links them? provenance
- Was lignite from different seams or sources blended, and are the constituent proportions known? provenance
Sampling and reporting basis
Makes analytical results interpretable in relation to the lot and its moisture condition.
Sample representativeness
Record sampling coverage, preservation and analytical conventions before accepting a measurement as representative.
- How did sampling capture coarse material, fines and moisture variation across the lot? measurement
- Which results are as-received, air-dried, dry or dry ash-free, and could sample handling have changed moisture or oxidation state? measurement
Moisture and fuel performance Characterises the relationship between water content, coal analysis and usable fuel performance.
Lignite suitability depends strongly on the condition in which energy and composition are measured and delivered.
Water and energy
Relates measured moisture to calorific value and proposed conditioning.
Delivered energy condition
Assess energy properties for the actual delivery state and document assumptions about drying.
- What are the total moisture and gross or net calorific value of the delivered lot, using compatible bases? measurement
- If drying is proposed, what target moisture and energy requirement are supported by testing or a documented calculation? action
Organic and mineral fractions
Separates fuel-composition evidence from mineral and ash behaviour.
Composition and residue behaviour
Record proximate and elemental analyses alongside mineral or ash tests needed for the proposed use.
- What do proximate and elemental analyses show, and which quantities were measured directly or calculated? measurement
- Which mineral, ash-composition or ash-fusion tests are needed to judge compatibility with the intended conversion equipment? action
Physical condition and storage Tracks particle condition, moisture changes and evidence relevant to deterioration or self-heating.
Extraction-time analyses alone do not establish the condition of lignite after crushing, drying, transport or storage.
Fragmentation and moisture change
Records handling properties and their evolution during conditioning and exposure.
Size and condition evolution
Link current particle-size and moisture measurements to processing and storage history.
- What are the current particle-size distribution and fines content after handling or drying? measurement
- Has storage exposure caused drying, rewetting or fragmentation sufficient to invalidate earlier handling or fuel assessments? boundary
Oxidation and self-heating
Connects observed thermal condition and oxidation evidence to applicable storage decisions.
Thermal condition assessment
Record evidence of heating and apply documented triggers appropriate to the lot and storage arrangement.
- What temperature trends or other monitored indicators suggest oxidation or self-heating, and where were they measured? measurement
- Which approved site procedure and trigger levels govern escalation when heating is suspected? action
Use suitability and material constraints Turns lot-specific properties into bounded decisions about use, handling and further assessment.
The designation lignite does not itself establish fitness for a process or determine the controls required for a particular form and jurisdiction.
Application acceptance
Compares measured lignite properties against an explicit receiving-process specification.
Lot fit for purpose
Determine whether available evidence supports acceptance, conditioning, blending or rejection for a named use.
- What limits does the intended process set for moisture, calorific value, particle size, sulfur and ash properties? boundary
- Does this lot meet those limits, and what additional testing or conditioning is needed before acceptance? action
Hazards and applicable obligations
Associates material-specific hazards and constituent evidence with the applicable handling context.
Documented handling constraints
Resolve dust, heating, constituent and transport concerns using evidence applicable to the actual lignite form.
- What testing or authoritative documentation establishes relevant dust, self-heating and constituent hazards for this material? provenance
- Which current jurisdictional and transport requirements apply, and what material identifiers do their supporting records use? action
- Do sulfur or trace-element results require further assessment of emissions or residues before the proposed use? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This is recalled knowledge, not source-verified research; standard editions and their precise scopes should be checked.
- The numerical ranges are broad descriptive values, not rank boundaries or purchase specifications; moisture and calorific-value reporting bases must be stated.
- Lignite is a heterogeneous geological material, not a pure compound with a single molecular formula, melting point or boiling point; identifiers and hazard classifications should be checked for the specific material.
- Which of these check these first hold for the sense of lignite this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Lignite A and lignite B in the ASTM rank classification
- Woody or xylitic lignite
- Earthy lignite
- Which of these kinds and varieties hold for the sense of lignite this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- ASTM International ASTM D388: classification of coals by rank, including lignite.
- International Organization for Standardization ISO 11760: classification of coals.
- ASTM International ASTM D3302/D3302M: determination of total moisture in coal.
- ASTM International ASTM D5865: determination of gross calorific value of coal and coke.
- Which of these standards and regulation hold for the sense of lignite this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Fuel for electricity generation, commonly near the mine because transporting its moisture is costly.
- Fuel for industrial heat and combined heat and power.
- Manufacture of fuel briquettes after suitable preparation and drying.
- Feedstock for gasification.
- Feedstock for some activated carbons and carbonaceous adsorbents.
- Which of these real-world use hold for the sense of lignite this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Total moisture, as received - Approximately 30-60; deposit and handling dependent - % by mass
- Gross calorific value, as received - Approximately 5-20; strongly dependent on moisture and ash - MJ/kg
- Which of these typical measurements hold for the sense of lignite this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Oxidation during storage can cause self-heating and spontaneous combustion.
- Airborne fine coal dust can ignite or explode under suitable conditions.
- Dust inhalation presents an occupational respiratory hazard.
- Combustion releases carbon dioxide and, depending on composition and controls, particulate matter, sulfur oxides, nitrogen oxides and trace contaminants.
- High moisture and variable ash content can reduce combustion efficiency and complicate fuel handling; ash chemistry can contribute to fouling and slagging.
- Which of these failure modes and hazards hold for the sense of lignite this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Brown coal is a common name, but its exact coverage relative to lignite varies among national classification systems.
- ASTM distinguishes lignite A and lignite B; other systems use different rank criteria and terminology.
- Moisture, ash, sulfur and trace-element contents vary substantially among deposits, so regional origin alone does not establish fuel quality.
- Which of these regional variation hold for the sense of lignite this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Peat - Peat is less coalified plant-derived material and a precursor to coal; lignite has undergone greater geological transformation.
- Subbituminous coal - Subbituminous coal is the next higher coal rank; the boundary depends on the classification system and specified analytical basis.
- Bituminous coal - Bituminous coal has a higher coalification rank and generally lower inherent moisture than lignite.
- Leonardite - Leonardite generally denotes strongly oxidized, humic-rich lignitic material rather than unweathered lignite fuel.
- Lignite briquette - A lignite briquette is a manufactured, compacted fuel product; lignite is the underlying geological material.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of lignite this model covers, and on what evidence? provenance
What the second pass must settle
- Which coal-rank classification should anchor this registry entry, and how should it map to regional uses of brown coal?
- Which analytical and sampling standards should govern basis conversions and representative lot assessment?
- Which authoritative chemical identifiers, if any, apply to lignite broadly versus particular commercial materials, and what are their scope limits?
- What lot-specific evidence is needed to assess dust and self-heating hazards after drying or crushing?
- Where should the registry place the identity boundary between conditioned lignite and manufactured lignite-derived products?