In the integrated process the raw materials processing non-ferrous metals companies, whether considered from the technical, economic, or more than, arsenic always - of the most harmful impurities. Until now, it has been difficult to calculate the distribution of arsenic in various products of the raw materials processed. At present, it is still difficult to calculate the distribution of arsenic in various products. At present, arsenic distribution and arsenic removal in various products and methods for recovering arsenic in the form of acceptable products are being studied.
Table 1 shows the distribution of arsenic in the sorting products of various ores.
About 84.7% of the arsenic remained in the tailings when sorting polymetallic ore . To a large extent, arsenic can be recovered into lead concentrates, which is about 7.8% of the total amount of arsenic in the ore . Copper ores and copper - zinc ores the process of sorting the arsenic will enter the copper concentrate, which is about 30.1% of the arsenic content in the ore. In the dressing process reasons recovering arsenic may be that the high strings; arsenic in the ore is tetrahedrite, the presence of arsenic and sulfate-containing pyrite form.
The copper concentrate contains 0.5 to 1.0% arsenic, and the concentrate obtained when the polymetallic tin ore is selected contains 5 to 8% of arsenic .
Most of the ore (for example, polymetallic ore, tin ore, most copper ore and copper - zinc ore) does not require arsenic removal in the final tailings, or arsenic can be easily removed by the sulfuric - sulfuric method.
Therefore, finding the ideal method to make arsenic into the final tailings, thereby reducing the arsenic content in the concentrate, has a great relationship with the copper concentrator. Reducing the arsenic content in the concentrate can greatly reduce the circulation of arsenic in the plant or between plants. This will reduce infrastructure investment and production costs in metallurgical enterprises for the capture of arsenic-containing waste and arsenic removal.
The distribution of arsenic in products such as lead, zinc, tin, nickel and cobalt is shown in Table 2 . It must be noted that the amount of arsenic entering the recycled product is large. In the lead production process, the amount of arsenic is particularly large, about 62.1% of the total amount of arsenic entering the lead-smelting plant .
Most of the arsenic (accounting for 62.4% of the total ) enters the smelter with copper concentrates and gold-bearing concentrates. When the concentrate is subjected to metallurgical treatment to obtain blister copper, most of the arsenic is transferred into the gas phase, which accounts for about 50 to 70% . Therefore, if the copper smelter does not have a fine dust removal and hygienic purification system for the exhaust gas, the amount of arsenic in the atmosphere will be very large. In order to reduce the amount of arsenic in the copper smelter, it is necessary to take effective measures to clean the exhaust gas and purify the waste gas and purify the washing liquid produced by the sulfuric acid . This problem is particularly acute and urgent for the Ala Verde Mining - Metallurgical Company and the Central Ural Copper Consolidation Plant.
Regarding the production of lead and copper in the production of lead and copper (see Table 3 ), it has great practical significance. In the lead smelter, most dust and arsenic from copper dross as a recycle return, and in the copper smelter, and the arsenic dust and slag - from returned as recycle. Processing dust has become a separate issue. For understanding. To solve this problem, you need to develop some new and effective methods can be integrated in order to deal with smoke and arsenic removal.
Currently, steel mills and lead smelter dust removal process is a God most costly operation. 2 to 4 times the cost of dust although copper, zinc, lead content equals or exceeds the arsenic content, but the costs of this operation than a recovery of copper, zinc and lead from the dust. The production cost of separating arsenic accounts for about 20% of its total cost , and the required investment accounts for 10% of the total investment . Â Â
Since the copper dross in the crude lead obtained during the removal of copper in the copper-containing not more than 10%, so some of these smelters often return smelting copper dross. In order to reduce the circulation of arsenic lead smelting plant, preferably copper removal is to develop a process for the dross into the copper from the crude lead spirit maximize manipulation. It is then treated and the resulting arsenic-containing product is detoxified.
Treating soot and copper-containing scum in a separate cycle can reduce the amount of arsenic recycled in the plant by 50-60% , reducing the amount of arsenic recycled between the plants by 45-55 % .
The most economical and promising approach is not only to detoxify arsenic-containing waste, but also to obtain qualified arsenic-containing products. Among these products are: arsenic trioxide, preservatives, wood preservatives, coatings used to protect sea shells, intermediate alloys, etc. However, at this stage, in order to expand the types of qualified arsenic-containing products and increase the demand for arsenic and arsenic compounds, the relevant central ministries and agencies must give sufficient attention and strong cooperation.
The detoxification of arsenic and arsenic-containing wastes in the form of micro-toxic products from arsenic-containing wastes is of great significance to the national economy. Arsenic sulfide or iron arsenic yellow slag is the most desirable form of arsenic. Among these compounds, the arsenic content is 35 to 50% and 45 to 50%, respectively . The most ideal method is to produce arsenic in the form of iron arsenic and yellow slag.
This is because iron and arsenic yellow slag does not cause the degree of contamination of the water in contact with it to exceed the allowable limit, and can be stored in an open storage yard. At the same time, iron arsenic yellow slag may become a raw material for producing qualified arsenic products in the future.
Develop and implement a reasonable method of removal of arsenic and arsenic are made of qualified products will be able to ensure economic ferrous metallurgy sector and the entire national economy by the department of further growth and reduce the level of pollution of the surrounding environment fundamentally.
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