scholarly journals SISTEM PENINGKATAN PRODUKTIVITAS MESIN PRODUKSI ASAM SULFAT DENGAN METODA TOTAL PRODUCTIVE MAINTENANCE

2015 ◽  
Vol 5 (3) ◽  
Author(s):  
Tri Sutrisno
Keyword(s):  
Sulfuric Acid ◽  
Acid Production ◽  
Continuous Process ◽  
Treatment System ◽  
Total Productive Maintenance ◽  
Sulfuric Acid Production ◽  
Improved Performance ◽  
Three Components

<p>Sulfuric acid production is a continuous process. With the process running constantly then the condition<br />of machinery should be maintained properly so as not frequent downtime. Downtime will result in<br />decreased production achievement and damage the quality of the product.<br />To overcome this designed a treatment system using the concept of TPM in a corporate<br />environment, which is expected to bring harmony between the operator as to the implementation of the<br />production engineer and production planner’s parties as well as the maintenance. The concept of total<br />productive maintenance is one way for the company's improved performance is more stable. The<br />concept of total productive maintenance consists of three important components of a total approach,<br />efforts productive, and maintenance. Of the three components can be explained using the concept of<br />Overall Equipment Effectiveness and autonomous maintenance.</p>

scholarly journals Arsenic in Chemical and Metallurgical Conversions of Copper-zinc Concentrates

2020 ◽  
Author(s):  
Evgeny Nikolaevich Selivanov ◽  
Dmitry Olegovich Novikov ◽  
Vyacheslav Vasi- Lyevich Belyaev ◽  
Gennady Veniaminovich Skopov
Keyword(s):  
Sulfuric Acid ◽  
Electrostatic Precipitator ◽  
Metallic Copper ◽  
Gas Treatment ◽  
Sulfuric Acid Production ◽  
Keywords Arsenic ◽  
Copper Zinc ◽  
Sulfide Concentrates ◽  
Impurity Elements

Due to the deterioration of the quality of obtained sulfide-copper concentrates, arsenic circulates and accumulates in the intermediate products, which reduces the quality of the metal and associated product – sulfuric acid. A method of estimation the distribution of impurity elements can be created using the recycling of sulfide concentrates by various technologies (including autogenous smelting, matte conversion and flotation of slags). This technique is based on solving balance equations for iron, copper and arsenic with known compositions of the resulting products. The obtained data were used to assess of the extraction of arsenic into produce outputs (slag, matte, dust, etc.). In this study, the concentration of arsenic in the dust of metallurgical processes and sludge for cleaning acid solutions is confirmed. The increased temperature in the electrostatic precipitator of gas purification of autogenous processes lead to a partial transition of arsenic into the gas stream directed to the sulfuric acid production. It is possible to regulate the fraction of transition of arsenic to dust and sulfuric acid while changing the operating temperature in the electrostatic precipitator. To a lesser extent arsenic is concentrated in the tails of flotation of slag (11.7%) and metallic copper (2.9%). These data are useful for substantiating measures for the wastes recycling and improvement of the ecological environment in the enterprise operating districts. Keywords: arsenic, autogenous melting, matte conversion, slag flotation, purified gas treatment, distribution, dust, sludge

Pilot-Scale Bioleaching of Metals from Pyritic Ashes

2017 ◽  
Vol 262 ◽  
pp. 147-150
Author(s):  
Elina A. Vuorenmaa ◽  
Jarno Mäkinen ◽  
Tero Korhonen ◽  
Raisa Neitola ◽  
Anna H. Kaksonen
Keyword(s):  
Sulfuric Acid ◽  
Acid Production ◽  
Pilot Scale ◽  
Solution Ph ◽  
Mineral Salts ◽  
Sulfuric Acid Production ◽  
Stirred Tank Reactors ◽  
Working Volume ◽  
Guideline Values ◽  
The Government

Solid waste from sulfuric acid production may contain relatively high levels of metals such as Fe, Zn, Co, Cu and As that are harmful if inappropriately disposed of in the environment, but may be a valuable resource if metals can be recovered. The objective of this research was to investigate the pilot-scale acid bioleaching of metals from pyritic ashes, originating from the roasting of pyrite ores for sulfuric acid production and consisting mainly of hematite. Bioleaching was carried out at 25 °C in pilot-scale continuously stirred tank reactors (CSTR), with 50 L working volume in mineral salts medium supplemented with trace elements, 1 % (w/v) elemental sulfur and with pyritic ash pulp densities 10 % and 20 %. The reactors were inoculated with a mixed culture of iron- and sulfur-oxidising acidophiles containing Acidithiobacillus (At.) ferrooxidans, At. thiooxidans/albertensis, At. caldus, Leptospirillum ferrooxidans, Sulfobacillus (Sb.) thermosulfidooxidans, Sb. thermotolerans and some members of Alicyclobacillus genus. Metal leaching yields from pyritic ashes in the CSTR after 32 days were 54.6-56.7 % Cu, 41.7-43.2 % Zn, 1.7-1.8 % Co, 3.0-5.4 % As and 0.3-0.5 % Fe. Solution pH decreased during the experiment from 2.9 to 1.9-2.2. Elemental analysis using X-ray fluorescence showed that the contents of metals, except for As, in the leach residue were below the higher guideline values given in the Government decree on the assessment of the soil contamination and remediation needs by the Ministry of the Environment, Finland. Bioleaching facilitated the extraction of metals from pyritic ashes and the mitigation of environmental risks related to the residue disposal for other metals except for As.

Synthesis of a Mixed Catalyst for Sulfuric Acid Production Using Various Wastes

2003 ◽  
Vol 76 (11) ◽  
pp. 1769-1771
Author(s):  
L. A. Nefedova ◽  
S. A. Lavrishcheva ◽  
E. I. Dobkina ◽  
S. M. Kuznetsova
Keyword(s):  
Sulfuric Acid ◽  
Acid Production ◽  
Sulfuric Acid Production ◽  
Mixed Catalyst
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