Method for cleaning treatment of hydrogen-containing tail gas and comprehensive recycling of antimony through antimony-containing alkaline leaching solution

Abstract

The invention relates to a method for cleaning treatment of acid production tail gas and comprehensive recycling of antimony through an antimony-containing alkaline leaching solution. Three levels of treatment technologies are used for conducting antimony precipitation and liquid reutilization after antimony precipitation. According to the first-level treatment technology, the antimony-containing alkaline leaching solution and the acid production waste gas are subjected to a neutral reaction, antimony precipitate is generated in the reaction, the reaction endpoint PH is controlled to range from 3 to 4, and antimony precipitate slag is recycled after filtration; according to the second-level treatment technology, waste acid washing and filtering of the antimony precipitate slag are conducted, and high-quality antimony precipitate slag is obtained; and according to the third-level treatment technology, the PH of liquid obtained after the neutral reaction is adjusted to range from 7 to 8 through NaOH, the obtained liquid is applied to the pulp conditioning and roasting process of gold concentrates, zero emission of the antimony-containing alkaline leaching solution is achieved, and meanwhile harmless treatment of the acid production waste gas, antimony precipitation of the antimony-containing alkaline leaching solution and comprehensive utilization are truly achieved.

Description

technical field [0001] The invention relates to a method for comprehensively recovering antimony by using an antimony-containing alkali immersion solution to clean and treat tail gas from an acid production process, and belongs to the technical fields of antimony-containing concentrate treatment, chemical industry waste liquid, waste gas treatment and environmental protection. Background technique [0002] At present, although more than 120 antimony-containing minerals have been found on the earth's crust, there are only 10 antimony minerals with industrial value that are suitable for the current dressing and smelting conditions and contain more than 20% antimony, namely stibnite (containing Sb 71.4 %), stimonite (containing Sb83.3%), antimonite (containing Sb 83.3%), antimony ocher (containing Sb 74% ~ 79%), yellow antimony (containing Sb 74.5%), sulfoxystibite (containing Sb 75.2%), natural antimony (containing 100% Sb), thimrosite (containing 51.6% Sb), brittle thiopyroni...

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Problems solved by technology

Although this item uses H for antimony-containing leachate 2 SO4, control the pH value at 0-8, carry out antimony precipitation, but need to consume sulfuric acid, resulting in high cost, and the poisonous gas hydrogen sulfide produced by the precipitation of antimony in the process, using NaOH solution for 3-stage washing and absorption, negative pressure induced wind, The use of primary load makes the process complicated and inevitably affects the surrounding environment

[0006] At the same time, in the process of roasting flue gas to produce sulfuric acid, a large amount of low-concentration waste acid (dilute acid) and flue gas tail gas are produced. The main component of tail gas is SO 2 and SO 3 At present, low-concentration waste acid (dilute acid) mainly adopts acid-base neutralization separate treatment technology, and flue gas tail gas mainly adopts electrostatic demisting technology. High cost and low comprehensive utilization value

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