Arizona Administrative Code › Title 18 - ENVIRONMENTAL QUALITY › Chapter 2 - DEPARTMENT OF ENVIRONMENTAL - QUALITY AIR POLLUTION CONTROL › APPENDICES › Appendix 8 - Procedures for Utilizing the Sulfur Balance Method for Determining Sulfur Emissions

Current through Register Vol. 30, No. 28, July 12, 2024
A8.1. Calculating Input Sulfur
Total sulfur input is the sum of the product of the weight of
				  each sulfur bearing material introduced into the smelting process as calculated
				  in A8.1.1. multiplied by the fraction of sulfur contained in that material as
				  calculated in A8.1.2. plus the amount of sulfur contained in fuel utilized in
				  the smelting process as calculated in A8.1.3.
A8.1.1. Material Weight
The owner or operator of a copper smelter shall weigh all
				  sulfur-bearing materials, other than fuels, introduced into the smelting
				  process. The weighing shall be subject to the following conditions:
A8.1.1.1. Weight shall be determined on a belt scale, rail or
				  truck scales, or other weighing device.
A8.1.1.2. Weight shall be determined within an accuracy of
				  ± 5%.
A8.1.1.3. All devices or scales used for weighing shall be
				  calibrated to manufacturer's specifications at least once a month.
A8.1.1.4. Sulfur-bearing materials subject to being weighed
				  include concentrate, cement copper, reverts that are discarded and not part of
				  the internal circulating load and precipitates. Materials such as limestone and
				  silica flux that are mixed with a charge of sulfur bearing materials shall be
				  weighed and reported by the owner or operator.
A8.1.2. Sulfur Content
The owner or operator shall calculate the sulfur content of
				  all sulfur-bearing materials introduced into the smelting process using the
				  following steps or an alternative method approved according to A8.4.1.
A8.1.2.1. Sampling
The procedures followed by the owner or operator in sampling
				  are dependent upon the input vehicles for the sulfur-bearing material.
A8.1.2.1.1. Beltfeed
The smelter owner or operator shall collect a five-pound
				  sample each hour. The owner or operator shall combine hourly samples for a
				  total daily sample.
A8.1.2.1.2. Railcar
The smelter owner or operator shall collect a 24-pound sample
				  from each car by the auger method at a minimum of four locations. The owner or
				  operator shall combine each car sample with all other car samples for a total
				  lot sample.
A8.1.2.1.3. Truck
The owner or operator shall collect a 12-pound sample from
				  each truck load. The owner or operator shall take samples at two locations
				  during unloading. If more than one truck delivers a single lot, the samples
				  from each truck shall be combined for a total lot sample.
A8.1.2.2. Sample Preparation
The owner or operator shall prepare each total sample for
				  analysis in the following manner:
A8.1.2.2.1. The sample shall be crushed to minus 1/4 inch
				  particles.
A8.1.2.2.2. 2000 gm of the sample shall be split out using a
				  Jones Riffle Splitter or similar device.
A8.1.2.2.3. The 2000 gm sample shall be pulverized to minus
				  150 mesh.
A8.1.2.2.4. The pulverized mass shall be mixed using a
				  rolling cloth.
A8.1.2.2.5. 500 gm shall be split out for sample
				  analysis.
A8.1.2.3. Sample Analysis
A8.1.2.3.1. The owner or operator shall analyze the sample to
				  determine sulfur content using the Barium Sulfate (BaSO4
				  ) Gravimetric Method according to A8.4.3. The analysis shall be accurate to
				  within ± 1%.
A8.1.2.3.2. For purposes of comparison, the owner or operator
				  shall analyze the sample for copper content using the Potassium Iodide (KI)
				  Titration Method according to A8.4.3. The analysis shall be accurate to within
				  ± 1%.
A8.1.3. Fuel Sulfur Content
The owner or operator shall calculate sulfur in fuels by
				  multiplying the amount of fuel that enters the process by the fraction of
				  sulfur in the fuel, as reported to the smelter operator by the fuel's supplier.
				  The sulfur content determination shall be accurate to within ±
				  5%.
A8.2. Calculating Removed Sulfur
Total removed sulfur is the sum of the removed sulfur in each
				  of the following products as determined by each process set forth below, or by
				  other processes approved according to A8.4.1.
A8.2.1. Furnace and Convertor Slags
A8.2.1.1. The owner or operator shall determine the weight of
				  each slag using a scale with an accuracy within ± 5%.
A8.2.1.2. The owner or operator shall collect a five-pound
				  sample from each slag pot during tapping operations.
A8.2.1.3. The owner or operator shall prepare the sample and
				  determine the amount of sulfur and copper using the procedures specified in
				  A8.1.2.2. and A8.1.2.3.
A8.2.2. Dust Collection Equipment Dusts
A8.2.2.1. After the owner or operator collects the dust and
				  places it in a rail car or truck they shall weigh it using a scale with an
				  accuracy within ± 5%.
A8.2.2.2. The owner or operator shall sample the dust and
				  prepare and analyze a sample for sulfur and copper using the procedures
				  specified in A8.1.2.1., A8.1.2.2., and A8.1.2.3.
A8.2.3. Strong Acids
A8.2.3.1. The owner or operator shall take an inventory of
				  strong acids daily by means of a manometer or sight glass, and increase the
				  inventory by the amounts of acid shipped or otherwise transferred during that
				  day.
A8.2.3.2. The owner or operator shall ensure the daily
				  inventory will be accurate to within ± 5%.
A8.2.3.3. The owner or operator shall take a sample of each
				  batch of the inventoried acid and analyze the sample for sulfur, according to
				  the procedures in A8.1.2.3.
A8.2.4. Weak Acids
A8.2.4.1. The owner or operator shall determine the amount of
				  weak acid discharged from an acid plant and scrubber systems by a time
				  volumetric method of measurement in gallons per minute and to an accuracy of
				  within ±20%.
A8.2.4.2. The owner or operator shall analyze a 500 ml sample
				  of the weak acid daily for sulfur content according to the procedures in
				  A8.1.2.3.
A8.2.5. Sulfur in Copper Production
A8.2.5.1. The owner or operator shall determine the weight of
				  copper produced by weight of copper cast to an accuracy of within ±
				  5%.
A8.2.5.2. The owner or operator shall record the weight and
				  number of castings.
A8.2.5.3. The owner or operator shall obtain a sample of the
				  copper, either by the grab sample method while casting, or by the use of at
				  least three drill holes on a representative casting from each charge.
A8.2.5.4. The owner or operator shall obtain at least one
				  sample from each charge.
A8.2.5.5. The owner or operator shall analyze each sample for
				  sulfur content using the Barium Sulfate (BaSO4) Gravimetric Method according to
				  A8.4.3. The analysis shall be accurate to within ± 50%.
A8.2.6. Materials in Process
A8.2.6.1. The owner or operator shall determine the total
				  tonnage of materials in process by physical inventory on the first or last day
				  of each month.
A8.2.6.2. The owner or operator shall calculate a monthly
				  change in in-process inventory for each material in process by taking the
				  difference between the inventory from each material in process on the first or
				  last day of the preceding month and multiplying that difference by the monthly
				  composite sulfur assay for that material.
A8.2.6.3. The change in monthly in-process inventory shall be
				  accurate to within ± 50%.
A8.3. Sulfur Dioxide Emissions Monitoring
A8.3.1. The sulfur dioxide emissions monitoring and recording
				  system required under
				  R18-2-715.01(K)
				  through
				  R18-2-715.01(N)
				  shall meet the following specifications:
A8.3.1.1. The monitoring system shall be capable of
				  continuously monitoring sulfur dioxide emissions with an accuracy of within
				  ±20% and a confidence level of 95%.
A8.3.1.2. The owner or operator shall operate and calibrate
				  the sulfur dioxide emission monitoring and recording equipment according to
				  manufacturer's specifications for the equipment except that calibration shall
				  be done at least once every 24 hours.
A8.3.2. The sulfur removal equipment bypass monitoring
				  required under
				  R18-2-715.01(Q)
				  shall consist of a detector and recorder system capable of producing a
				  permanent record of all periods that the bypass is in operation.
A8.4. General Provisions
A8.4.1. For purposes of this Appendix, an approved
				  alternative method, process, or procedure, must be approved in writing by the
				  Director and the U.S. Environmental Protection Agency.
A8.4.2. The processes and procedures specified in this
				  Appendix shall be available for inspection, review and verification by the
				  Department at all reasonable times.
A8.4.3. The barium sulfate gravimetric test method and
				  potassium iodide titration test method provided in Standard Methods of Chemical
				  Analysis, Volume One, The Elements, Sixth Edition, N. Howell Furman (ed.), D.
				  Van Nostrand Company, Inc., Princeton, New Jersey, 1962, pages 410-411,
				  1006-1011, and 1342-1343 (and no future editions or amendments) is incorporated
				  by reference and available at the Department.