Supplier of Recovery and Beneficiation Solutions and Complete Equipment Sets for Quartz Vein-Type Gold Deposits

Summary: In quartz vein-type gold deposits, gold is present in pyrite and quartz fissures in both coarse and fine grains; a single process cannot achieve complete recovery, and a combined process is the most reliable approach.

Step 1: Crushing and Grinding. Coarse crushing is performed using a jaw crusher, followed by medium and fine crushing with a cone crusher, adhering to the principle of “more crushing, less grinding.”Grinding employs a two-stage process using a grid-type ball mill followed by an overflow-type ball mill, with the second stage forming a closed-circuit with a spiral classifier or hydrocyclone. The fineness of grinding determines the degree of liberation—which is the foundation for the effectiveness of gravity separation and flotation; if the grinding fineness is incorrect, all subsequent steps will be in vain.

Step 2: Recover coarse-grain gold via gravity separation in the grinding circuit. Install a centrifugal separator (such as a Nelson centrifuge) or a jig within the grinding circuit to recover coarse-grain free gold at an early stage.This is a critical step for “early and maximum recovery” in quartz vein-type gold deposits—recovering coarse-grain gold early in the grinding circuit prevents gold loss to tailings caused by over-grinding. The gravity concentration concentrate is sent to a shaking table for final concentration, producing gold of marketable quality or concentrate for sale.

Step 3: Recover gold-bearing sulfides via flotation. The gravity separation tailings are fed into the flotation circuit, which employs a process ranging from “one roughing, two cleaning, two scavenging” to “one roughing, three cleaning, three scavenging” to float gold-bearing sulfides such as pyrite along with the gold.The flotation reagent regime is adjusted to suit the characteristics of gold-bearing pyrite; the type and dosage of collectors, pH adjusters, and the selection of activators/inhibitors determine the selectivity of the flotation process. The flotation concentrate is sent for smelting or cyanide leaching, while the tailings are dewatered and discharged.

Step 4: Cyanidation or direct smelting of the flotation concentrate. Since flotation concentrates have a low yield but high grade, sending them to smelting is the most economical option; if they contain interfering elements such as arsenic, they may be pretreated before cyanidation. For ore with a high degree of oxidation and no interfering elements, flotation can be bypassed in favor of direct whole-ore cyanidation (CIL/CIP).

Key Process Considerations: For coarse-grained gold, adhere to the principle of “early recovery and maximum recovery” to avoid gold loss to tailings due to over-grinding; adjust the flotation reagent regime to account for the gold-bearing characteristics of pyrite; the placement of gravity separation within the grinding circuit and whether to regrind and re-leach flotation tailings are critical decisions that determine the overall recovery rate and must be verified through mineral processing tests.

It is worth emphasizing that GoldProcessingPlant operates two major in-house manufacturing bases in Shandong and Jiangxi, China, where all core equipment—including crushers, ball mills, centrifugal mineral separators, flotation cells, and CIL leaching tanks—is manufactured in-house.Process engineers and mechanical engineers work collaboratively within the same team, ensuring that equipment is manufactured strictly in accordance with process design drawings, thereby avoiding discrepancies such as “mismatches between design drawings and actual equipment dimensions.”

Should a grid-type or overflow-type ball mill be selected? This primarily depends on process requirements. Grid-type mills feature forced discharge, handle large throughput, are suitable for coarse grinding or the first grinding stage, and are less prone to over-grinding; overflow-type mills rely on gravity overflow, achieve finer grinding fineness, and are suitable for fine grinding or the second grinding stage.Quartz vein-type gold mines typically employ a two-stage grinding configuration consisting of a first-stage grid-type mill followed by a second-stage overflow-type mill; the specific configuration depends on the degree of liberation of the gold ore.

With so many types of flotation cells available, how do you choose? If the process requires self-priming of the slurry (such as in the initial stages of roughing or scavenging), SF or BF types are commonly used; for large-scale direct-flow cell configurations, XCF/KYF or JJF types are more suitable. The specific selection must be based on the required throughput and aeration capacity.

How are wear resistance and corrosion resistance ensured? For abrasive gold ore with high silica content, the flow components can be replaced with high-chromium alloy or wear-resistant rubber; for acidic leaching environments, the equipment can be upgraded with corrosion-resistant stainless steel or lined with a corrosion-resistant coating. Customized material upgrades can be made based on the properties of the ore.

First, we understand the ore; then, we select the equipment; finally, we work with you to fine-tune the process until gold is recovered. For recovery and beneficiation solutions for quartz vein gold deposits, the key is not simply stacking equipment, but ensuring seamless integration between “ore—process—equipment.”Prioritize gravity separation for coarse-grain gold, use flotation as a backup for fine-grain gold, strictly control grinding fineness, and optimize the reagent regimen—with someone accountable for every step and someone taking full responsibility for every performance indicator. This is the value a turnkey equipment supplier should deliver.