Device for clearing accumulated dregs in pipelines without disassembly in zinc hydrometallurgy

Abstract

The invention relates to a device for clearing accumulated dregs in pipelines without disassembly in zinc hydrometallurgy. The device comprises an acid concentration tank, an underflow intermediate tank, an underflow circulation tank, a dreg clearing pump, a first accumulated dreg pipeline, an underflow circulating pump and a second accumulated dreg pipeline. The device can clear two sets of pipelines at the same time, the dregs in the pipelines are rapidly cleared with high efficiency and good effect, the pipelines are not disassembled in the whole clearing process, the degree of automation is high, and the cost is low; the cleared ore pulp is subsequently processed to recover part of valuable metals, and meanwhile, the environment is not polluted.

Description

technical field [0001] The invention relates to a device for cleaning slag accumulated in pipelines, in particular to a device for cleaning slag accumulated in pipelines without dismantling in zinc hydrometallurgy. Background technique [0002] The traditional zinc hydrometallurgy process mainly includes roasting, leaching, leachate purification and electrolysis of zinc sulfide concentrate. Before the zinc sulfide concentrate is roasted at high temperature, the amount of calcium oxide in the zinc concentrate accounts for about 0.9% to 1.0%. The amount of magnesium oxide accounts for about 0.2% to 0.3%. After roasting, almost all of them enter the leaching process together with the calcine. During the leaching process, about 10% of the calcium and magnesium in the calcine enter the liquid phase in the form of calcium sulfate and magnesium sulfate. A saturated solution of calcium sulfate and magnesium sulfate is formed. At the same time, there is also a certain concentration ...

AI Technical Summary

Problems solved by technology

The method ① uses the acid in the wastewater to partially dissolve basic zinc sulfate, calcium sulfate dihydrate and magnesium sulfate crystals, but due to the low temperature of the wastewater, the reaction is slow, the cleaning time is long, the water consumption is large, and the volume of the system is not allowed. Poor; method ② needs to dismantle all the pipes to proceed, the labor intensity of the workers is high, it takes a long time, and the inner wall of the pipe is easily damaged during the beating process, resulting in uneven inner walls, and it is easier to crystallize and accumulate slag in subsequent production; method ③ is due to calcium and magnesium The crystalline slag has a compact structure and high hardness. It is difficult for the PIG made of other materials such as polyurethane foam plastic or rubber to separate from the pipe wall and push forward, and the pipeline of the hydrometallurgy zinc is complicated. On-line instruments, There are many baffles, elbows, valves, and tees, which will cause the PIG to be scratched or even stuck in the pipeline; method ④ consumes a lot of water, and the solution and slag that are flushed out are likely to pollute the environment; method ⑤ needs to be temporarily overlapped At the same time, the amount of cleaning agent is large, and the waste liquid and residue after cleaning need to be treated in an environmentally friendly manner. The cleaning cost is high and the cycle is long

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