Operation guideline of antimony trioxide furnace

1. Operation guideline of antimony trioxide furnace
   1.General principles
   1.1 All workers and staffs of the antimony trioxide furnace including 5 technicians and 36 operating workers should learn knowledge of quality management, metallurgy technology, safety etc, should improve their operation, reduce energy consumption and increase economic efficiency.
   1.2 Post responsibility
   1.21 Responsibility of furnace director
   a). Take full responsibility of the whole furnace production, including bags shaking team and packing team, control the production plan and various production and technical target.
   b). Organize all workers and staffs to study technology, to complete the production task given by the company.
   c). To audit and supervise production of all working teams, to insure the production conditions well including equipment, tools and lightening.
   d). To timely handle various problems in production, insure the quantity and quality of the production.
   e). To implement the stipulation of shift hand over and take over, insure the workshop safety and sanitation.
   1.22 Responsibility of the team foreman: to organize production of the work team, handle various problems and accidents linked with production, insure the complete of the production tasks. To keep the equipment, tools and lightening in good condition. To keep the order of the workshop. To keep record of production and shift.
   1.23 Responsibility of furnace operators: furnace heat up, furnace operation, accident handle.
   2. Specifications of fuel & raw materials
   2.1 Specification of fuel

   Name	Fixing carbon(%)	Volatile(%)	Ash(%)
   Coke	>=75	<=7	<=20
   Coal	>=77		<=20

   2.2 .Specification of raw material

   Name	As(%)	Pb(%)	Se(%)	Sn(%)
   0#Antimony metal	<=0.05	<=0.01	<=0.005	<=0.005
   1#Antimony metal	<=0.05	<=0.02	<=0.005	<=0.005
   Antimony trioxide raw material	<=0.05	<=0.05	<=0.005	<=0.005

   3. Furnace heat up
   New constructed furnace after overhaul, heat up for 15days. metaphase repair, heat up for 7 days.
   4. Preparation before blast and start up of blasting
   a). After the completion of furnace heating up, feed in antimony metal according to the formula.,4-4.5tons of antimony metal to be charged within 24 hours.
   b). Monitor the temperature of the antimony liquid, once it reach 750℃, stop charging of coal, bump out the gas and ash from the chamber.
   c). Inspect blowing pipes; skim the impurities on the surface of the antimony liquid.
   d). Start up blasting fan and the in-between exhaust fan, start trial run.
   e). Install the blender, start up the compressor, connect the blowing pipes, normal operation,
   switch the waste exhaust off.
   f). After 8 hours blowing, sampling and inspecting the whiteness and content, if meet the standard, then shaking the bags have the antimony trioxide drop down to the bottom of the reverberator.
   5. Daily operation:
   a). According to the formula, feed in raw materials, control the impurity content to meet the standard: As<=0.05%, Pb<=0.05. Raw material charge should be at small quantity in many times.
   b). To observe the react chamber every 20-30 minutes, to take the antimony trioxide off from the inner wall of the chamber and the surface of the blowing pipes as well as the outlet. The day shift should clean the react chamber one time a shift. And every Monday, Wednesday and Friday to clean the furnace hearth.
   c). To observe the antimony liquid, if the impurity and bulb cumulated, to handle timely.
   d). Air blowing and temperature control

   Phase	Air volume(Nm3/h)	Temperature(0c)
   Initial	40~50	750~850
   Normal	35~40	900~1000

   1. Motor frequence of the of the exhaust fan: initial 15-50Hz, normal 40-50Hz.

   g). Air blowing pipe should be stainless steel pipe with diameter 16*3mm,length 1300~1500mm, it must be inserted into the centre of the furnace hearth vertically.
   h). Air blowing pipe should be changed every 4 hours, the action must be swift. Broken pipe should be replaced at once. If the furnace temperature is found lower, reduce the exhausting, reduce the charging amount, and increase blasting.
   6. Exception handles
   a).If the temperature of the react chamber is higher, increase the charging quantity and shorten the alternation, reduce the air blasting.
   b).If the temperature of the react chamber is lower, reduce the charging quantity and enlarge the alternation, increase air blasting.
   c).If black antimony trioxide appears, check the air blowing pipe, temperature, if exception occur, to handle duly.
   d) If black antimony trioxide was found after the change of raw materials, advise the technicians to adjust the formula.
   e).If the TAI is higher, take the following measure according to the temperature and the visibility of the furnace hearth:
   1)If the temperature is lower, reduce exhausting and increase blasting.
   2)If the temperature is higher, increase exhausting and reduce blasting.
   3)Check the pipes for leakage.
   4)Clean the react chamber.
   f). Power off and equipment emergency: for short time power off and or equipment maintain, close all of the gates and cover of the react chamber, heat preservation. If the power off and or equipment maintain last over 4 hours, close all of the covers and gates in advance, fire up in the chamber for heat preservation.
   7. For one of the following instance, furnace must be shut down:
   a).Water jacket leakage.
   b). Serious unstable of the bottom bricks.
   c). Serious equipment emergency that can not maintained while production.
   d). Impurity of antimony trioxide exceeding standard Pb>=0.11%.
   Before the furnace shut down, to stop blasting and have the cover closed firstly, stop in-between exhaust fan and compressor, start up the waste gas exhaust fan and ladle the antimony liquid out completely. If the shut down is caused by the impurity exceeding, while the furnace and equipment all in good condition, after cleaning of the cyclone dust collector and the flue, fire up and heat up the furnace again. Otherwise, have the furnace cool down gradually, under the instruction of the workshop to start another furnace terms.
   8. Interior control standard of antimony trioxide production:

   Grade	Sb2O3 99.80	Sb2O3 99.80	Sb2O3 99.50	Sb2O3 99.00	Sb2O3 98.00	SbO 98.00
   Sb2O3%>=	99.80	99.80	99.50	99.00	98.00	98.00
   As2O3%<=	0.03	0.05	0.06	0.08	0.09
   PbO%<=	0.03	0.08	0.10	0.18	0.25	-
   Fe2O3%<=	0.002	0.005	0.006	-	-	-
   Se%<=	0.002	0.004	0.004	-	-	-
   CuO%<=	0.001	0.005	0.005	-	-	-
   L	96.00	-	-	-	-	-
   A	0.6.	-	-	-	-	-
   b	0.4	-	-	-	-	-
   White degree	97.5	97	95	93	91	88
   Average size	0.3-0.6Um	0.3-0.6Um 0.8-1.1um	0.3-.06um 0.8-1.1Um	0.7-1.1um	0.7-1.1Um	0.7-1.1um